Tolto un controllo inutile sul nome che finisce con .pdf

Change get backend method for Lattice and run tests

.coveragerc

@@ -1,3 +1,2 @@
 [run]
 branch = True
-omit = camelot/ext/*

.deepsource.toml

@@ -1,12 +0,0 @@
-version = 1
-
-exclude_patterns = [
-  "camelot/ext/**"
-]
-
-[[analyzers]]
-name = "python"
-enabled = true
-
-[analyzers.meta]
-runtime_version = "3.x.x"

.editorconfig

@@ -1,10 +0,0 @@
-root = true
-
-[*]
-end_of_line = lf
-insert_final_newline = true
-
-[*.py]
-charset = utf-8
-indent_style = space
-indent_size = 4

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,57 @@
+---
+name: Bug report
+about: Please follow this template to submit bug reports.
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+<!-- Please read the filing issues section of the contributor's guide first: https://camelot-py.readthedocs.io/en/master/dev/contributing.html -->
+
+**Describe the bug**
+
+<!-- A clear and concise description of what the bug is. -->
+
+**Steps to reproduce the bug**
+
+<!-- Steps used to install `camelot`:
+1. Add step here (you can add more steps too) -->
+
+<!-- Steps to be used to reproduce behavior:
+1. Add step here (you can add more steps too) -->
+
+**Expected behavior**
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+**Code**
+
+<!-- Add the Camelot code snippet that you used. -->
+
+```
+import camelot
+
+# add your code here
+```
+
+**PDF**
+
+<!-- Add the PDF file that you want to extract tables from. -->
+
+**Screenshots**
+
+<!-- If applicable, add screenshots to help explain your problem. -->
+
+**Environment**
+
+- OS: [e.g. macOS]
+- Python version:
+- Numpy version:
+- OpenCV version:
+- Ghostscript version:
+- Camelot version:
+
+**Additional context**
+
+<!-- Add any other context about the problem here. -->

.github/workflows/tests.yml

@@ -0,0 +1,44 @@
+name: tests
+
+on: [pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install camelot with dependencies
+        run: |
+          make install
+      - name: Test with pytest
+        run: |
+          make test
+
+  test_latest:
+    name: Test on ${{ matrix.os }} with Python 3.9
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: [3.9]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install camelot with dependencies
+        run: |
+          make install
+      - name: Test with pytest
+        run: |
+          make test

.gitignore

@@ -1,3 +1,4 @@
+fontconfig/
 __pycache__/
 *.py[cod]
 *.so

.readthedocs.yml

@@ -21,4 +21,7 @@ formats:
 python:
   version: 3.8
   install:
-    - requirements: requirements.txt
+    - method: pip
+      path: .
+      extra_requirements:
+        - dev

.travis.yml

@@ -1,29 +0,0 @@
-sudo: true
-language: python
-cache: pip
-addons:
-  apt:
-    update: true
-install:
-  - make install
-jobs:
-  include:
-    - stage: test
-      script:
-        - make test
-      python: '3.6'
-    - stage: test
-      script:
-        - make test
-      python: '3.7'
-      dist: xenial
-    - stage: test
-      script:
-        - make test
-      python: '3.8'
-      dist: xenial
-    - stage: coverage
-      python: '3.8'
-      script:
-        - make test
-        - codecov --verbose

HISTORY.md

@@ -4,6 +4,53 @@ Release History
 master
 ------
 
+0.10.1 (2021-07-11)
+------------------
+
+- Change extra requirements from `cv` to `base`. You can use `pip install "camelot-py[base]"` to install everything required to run camelot.
+
+0.10.0 (2021-07-11)
+------------------
+
+**Improvements**
+
+- Add support for multiple image conversion backends. [#198](https://github.com/camelot-dev/camelot/pull/198) and [#253](https://github.com/camelot-dev/camelot/pull/253) by Vinayak Mehta.
+- Add markdown export format. [#222](https://github.com/camelot-dev/camelot/pull/222/) by [Lucas Cimon](https://github.com/Lucas-C).
+
+**Documentation**
+
+- Add faq section. [#216](https://github.com/camelot-dev/camelot/pull/216) by [Stefano Fiorucci](https://github.com/anakin87).
+
+0.9.0 (2021-06-15)
+------------------
+
+**Bugfixes**
+
+- Fix use of resolution argument to generate image with ghostscript. [#231](https://github.com/camelot-dev/camelot/pull/231) by [Tiago Samaha Cordeiro](https://github.com/tiagosamaha).
+- [#15](https://github.com/camelot-dev/camelot/issues/15) Fix duplicate strings being assigned to the same cell. [#206](https://github.com/camelot-dev/camelot/pull/206) by [Eduardo Gonzalez Lopez de Murillas](https://github.com/edugonza).
+- Save plot when filename is specified. [#121](https://github.com/camelot-dev/camelot/pull/121) by [Jens Diemer](https://github.com/jedie).
+- Close file streams explicitly. [#202](https://github.com/camelot-dev/camelot/pull/202) by [Martin Abente Lahaye](https://github.com/tchx84).
+- Use correct re.sub signature. [#186](https://github.com/camelot-dev/camelot/pull/186) by [pevisscher](https://github.com/pevisscher).
+- [#183](https://github.com/camelot-dev/camelot/issues/183) Fix UnicodeEncodeError when using Stream flavor by adding encoding kwarg to `to_html`. [#188](https://github.com/camelot-dev/camelot/pull/188) by [Stefano Fiorucci](https://github.com/anakin87).
+- [#179](https://github.com/camelot-dev/camelot/issues/179) Fix `max() arg is an empty sequence` error on PDFs with blank pages. [#189](https://github.com/camelot-dev/camelot/pull/189) by Vinayak Mehta.
+
+**Improvements**
+
+- Add `line_overlap` and `boxes_flow` to `LAParams`. [#219](https://github.com/camelot-dev/camelot/pull/219) by [Arnie97](https://github.com/Arnie97).
+- [Add bug report template.](https://github.com/camelot-dev/camelot/commit/0a3944e54d133b701edfe9c7546ff11289301ba8)
+- Move from [Travis to GitHub Actions](https://github.com/camelot-dev/camelot/pull/241).
+- Update `.readthedocs.yml` and [remove requirements.txt](https://github.com/camelot-dev/camelot/commit/7ab5db39d07baa4063f975e9e00f6073340e04c1#diff-cde814ef2f549dc093f5b8fc533b7e8f47e7b32a8081e0760e57d5c25a1139d9)
+
+**Documentation**
+
+- [#193](https://github.com/camelot-dev/camelot/issues/193) Add better checks to confirm proper installation of ghostscript. [#196](https://github.com/camelot-dev/camelot/pull/196) by [jimhall](https://github.com/jimhall).
+- Update `advanced.rst` plotting examples. [#119](https://github.com/camelot-dev/camelot/pull/119) by [Jens Diemer](https://github.com/jedie).
+
+0.8.2 (2020-07-27)
+------------------
+
+* Revert the changes in `0.8.1`.
+
 0.8.1 (2020-07-21)
 ------------------
 

LICENSE

@@ -1,12 +1,7 @@
 MIT License
 
-Modifications:
-
-Copyright (c) 2019 Camelot Developers
-
-Original project:
-
-Copyright (c) 2018 Peeply Private Ltd (Singapore)
+Copyright (c) 2019-2021 Camelot Developers
+Copyright (c) 2018-2019 Peeply Private Ltd (Singapore)
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -4,26 +4,25 @@
 
 # Camelot: PDF Table Extraction for Humans
 
-[![Build Status](https://travis-ci.org/camelot-dev/camelot.svg?branch=master)](https://travis-ci.org/camelot-dev/camelot) [![Documentation Status](https://readthedocs.org/projects/camelot-py/badge/?version=master)](https://camelot-py.readthedocs.io/en/master/)
+[![tests](https://github.com/camelot-dev/camelot/actions/workflows/tests.yml/badge.svg)](https://github.com/camelot-dev/camelot/actions/workflows/tests.yml) [![Documentation Status](https://readthedocs.org/projects/camelot-py/badge/?version=master)](https://camelot-py.readthedocs.io/en/master/)
  [![codecov.io](https://codecov.io/github/camelot-dev/camelot/badge.svg?branch=master&service=github)](https://codecov.io/github/camelot-dev/camelot?branch=master)
  [![image](https://img.shields.io/pypi/v/camelot-py.svg)](https://pypi.org/project/camelot-py/) [![image](https://img.shields.io/pypi/l/camelot-py.svg)](https://pypi.org/project/camelot-py/) [![image](https://img.shields.io/pypi/pyversions/camelot-py.svg)](https://pypi.org/project/camelot-py/) [![Gitter chat](https://badges.gitter.im/camelot-dev/Lobby.png)](https://gitter.im/camelot-dev/Lobby)
-[![image](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black) [![image](https://img.shields.io/badge/continous%20quality-deepsource-lightgrey)](https://deepsource.io/gh/camelot-dev/camelot/?ref=repository-badge)
+[![image](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black)
 
+**Camelot** is a Python library that can help you extract tables from PDFs!
 
-**Camelot** is a Python library that makes it easy for *anyone* to extract tables from PDF files!
-
-**Note:** You can also check out [Excalibur](https://github.com/camelot-dev/excalibur), which is a web interface for Camelot!
+**Note:** You can also check out [Excalibur](https://github.com/camelot-dev/excalibur), the web interface to Camelot!
 
 ---
 
-**Here's how you can extract tables from PDF files.** Check out the PDF used in this example [here](https://github.com/camelot-dev/camelot/blob/master/docs/_static/pdf/foo.pdf).
+**Here's how you can extract tables from PDFs.** You can check out the PDF used in this example [here](https://github.com/camelot-dev/camelot/blob/master/docs/_static/pdf/foo.pdf).
 
 <pre>
 >>> import camelot
 >>> tables = camelot.read_pdf('foo.pdf')
 >>> tables
 &lt;TableList n=1&gt;
->>> tables.export('foo.csv', f='csv', compress=True) # json, excel, html, sqlite
+>>> tables.export('foo.csv', f='csv', compress=True) # json, excel, html, markdown, sqlite
 >>> tables[0]
 &lt;Table shape=(7, 7)&gt;
 >>> tables[0].parsing_report
@@ -33,7 +32,7 @@
     'order': 1,
     'page': 1
 }
->>> tables[0].to_csv('foo.csv') # to_json, to_excel, to_html, to_sqlite
+>>> tables[0].to_csv('foo.csv') # to_json, to_excel, to_html, to_markdown, to_sqlite
 >>> tables[0].df # get a pandas DataFrame!
 </pre>
 
@@ -46,24 +45,29 @@
 | 2032_2     | 0.17      | 57.8          | 21.7%                | 0.3%            | 2.7%            | 1.2%           |
 | 4171_1     | 0.07      | 173.9         | 58.1%                | 1.6%            | 2.1%            | 0.5%           |
 
-There's a [command-line interface](https://camelot-py.readthedocs.io/en/master/user/cli.html) too!
+Camelot also comes packaged with a [command-line interface](https://camelot-py.readthedocs.io/en/master/user/cli.html)!
 
 **Note:** Camelot only works with text-based PDFs and not scanned documents. (As Tabula [explains](https://github.com/tabulapdf/tabula#why-tabula), "If you can click and drag to select text in your table in a PDF viewer, then your PDF is text-based".)
 
+You can check out some frequently asked questions [here](https://camelot-py.readthedocs.io/en/master/user/faq.html).
+
 ## Why Camelot?
 
-- **You are in control.**: Unlike other libraries and tools which either give a nice output or fail miserably (with no in-between), Camelot gives you the power to tweak table extraction. (This is important since everything in the real world, including PDF table extraction, is fuzzy.)
-- *Bad* tables can be discarded based on **metrics** like accuracy and whitespace, without ever having to manually look at each table.
-- Each table is a **pandas DataFrame**, which seamlessly integrates into [ETL and data analysis workflows](https://gist.github.com/vinayak-mehta/e5949f7c2410a0e12f25d3682dc9e873).
-- **Export** to multiple formats, including JSON, Excel, HTML and Sqlite.
+- **Configurability**: Camelot gives you control over the table extraction process with [tweakable settings](https://camelot-py.readthedocs.io/en/master/user/advanced.html).
+- **Metrics**: You can discard bad tables based on metrics like accuracy and whitespace, without having to manually look at each table.
+- **Output**: Each table is extracted into a **pandas DataFrame**, which seamlessly integrates into [ETL and data analysis workflows](https://gist.github.com/vinayak-mehta/e5949f7c2410a0e12f25d3682dc9e873). You can also export tables to multiple formats, which include CSV, JSON, Excel, HTML, Markdown, and Sqlite.
 
-See [comparison with other PDF table extraction libraries and tools](https://github.com/camelot-dev/camelot/wiki/Comparison-with-other-PDF-Table-Extraction-libraries-and-tools).
+See [comparison with similar libraries and tools](https://github.com/camelot-dev/camelot/wiki/Comparison-with-other-PDF-Table-Extraction-libraries-and-tools).
+
+## Support the development
+
+If Camelot has helped you, please consider supporting its development with a one-time or monthly donation [on OpenCollective](https://opencollective.com/camelot).
 
 ## Installation
 
 ### Using conda
 
-The easiest way to install Camelot is to install it with [conda](https://conda.io/docs/), which is a package manager and  environment management system for the [Anaconda](http://docs.continuum.io/anaconda/) distribution.
+The easiest way to install Camelot is with [conda](https://conda.io/docs/), which is a package manager and environment management system for the [Anaconda](http://docs.continuum.io/anaconda/) distribution.
 
 <pre>
 $ conda install -c conda-forge camelot-py
@@ -71,10 +75,10 @@ $ conda install -c conda-forge camelot-py
 
 ### Using pip
 
-After [installing the dependencies](https://camelot-py.readthedocs.io/en/master/user/install-deps.html) ([tk](https://packages.ubuntu.com/bionic/python/python-tk) and [ghostscript](https://www.ghostscript.com/)), you can simply use pip to install Camelot:
+After [installing the dependencies](https://camelot-py.readthedocs.io/en/master/user/install-deps.html) ([tk](https://packages.ubuntu.com/bionic/python/python-tk) and [ghostscript](https://www.ghostscript.com/)), you can also just use pip to install Camelot:
 
 <pre>
-$ pip install "camelot-py[cv]"
+$ pip install "camelot-py[base]"
 </pre>
 
 ### From the source code
@@ -89,45 +93,21 @@ and install Camelot using pip:
 
 <pre>
 $ cd camelot
-$ pip install ".[cv]"
+$ pip install ".[base]"
 </pre>
 
 ## Documentation
 
-Great documentation is available at [http://camelot-py.readthedocs.io/](http://camelot-py.readthedocs.io/).
-
-## Development
-
-The [Contributor's Guide](https://camelot-py.readthedocs.io/en/master/dev/contributing.html) has detailed information about contributing code, documentation, tests and more. We've included some basic information in this README.
-
-### Source code
-
-You can check the latest sources with:
-
-<pre>
-$ git clone https://www.github.com/camelot-dev/camelot
-</pre>
-
-### Setting up a development environment
-
-You can install the development dependencies easily, using pip:
-
-<pre>
-$ pip install "camelot-py[dev]"
-</pre>
-
-### Testing
-
-After installation, you can run tests using:
-
-<pre>
-$ python setup.py test
-</pre>
+The documentation is available at [http://camelot-py.readthedocs.io/](http://camelot-py.readthedocs.io/).
 
 ## Wrappers
 
 - [camelot-php](https://github.com/randomstate/camelot-php) provides a [PHP](https://www.php.net/) wrapper on Camelot.
 
+## Contributing
+
+The [Contributor's Guide](https://camelot-py.readthedocs.io/en/master/dev/contributing.html) has detailed information about contributing issues, documentation, code, and tests.
+
 ## Versioning
 
 Camelot uses [Semantic Versioning](https://semver.org/). For the available versions, see the tags on this repository. For the changelog, you can check out [HISTORY.md](https://github.com/camelot-dev/camelot/blob/master/HISTORY.md).
@@ -135,9 +115,3 @@ Camelot uses [Semantic Versioning](https://semver.org/). For the available versi
 ## License
 
 This project is licensed under the MIT License, see the [LICENSE](https://github.com/camelot-dev/camelot/blob/master/LICENSE) file for details.
-
-## Support the development
-
-You can support our work on Camelot with a one-time or monthly donation [on OpenCollective](https://opencollective.com/camelot). Organizations who use camelot can also sponsor the project for an acknowledgement on [our documentation site](https://camelot-py.readthedocs.io/en/master/) and this README.
-
-Special thanks to all the users, organizations and contributors that support Camelot!

camelot/__version__.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-VERSION = (0, 8, 1)
+VERSION = (0, 10, 1)
 PRERELEASE = None  # alpha, beta or rc
 REVISION = None
 

camelot/backends/__init__.py

@@ -0,0 +1,3 @@
+# -*- coding: utf-8 -*-
+
+from .image_conversion import ImageConversionBackend

camelot/backends/ghostscript_backend.py

@@ -0,0 +1,47 @@
+# -*- coding: utf-8 -*-
+
+import sys
+import ctypes
+from ctypes.util import find_library
+
+
+def installed_posix():
+    library = find_library("gs")
+    return library is not None
+
+
+def installed_windows():
+    library = find_library(
+        "".join(("gsdll", str(ctypes.sizeof(ctypes.c_voidp) * 8), ".dll"))
+    )
+    return library is not None
+
+
+class GhostscriptBackend(object):
+    def installed(self):
+        if sys.platform in ["linux", "darwin"]:
+            return installed_posix()
+        elif sys.platform == "win32":
+            return installed_windows()
+        else:
+            return installed_posix()
+
+    def convert(self, pdf_path, png_path, resolution=300):
+        if not self.installed():
+            raise OSError(
+                "Ghostscript is not installed. You can install it using the instructions"
+                " here: https://camelot-py.readthedocs.io/en/master/user/install-deps.html"
+            )
+
+        import ghostscript
+
+        gs_command = [
+            "gs",
+            "-q",
+            "-sDEVICE=png16m",
+            "-o",
+            png_path,
+            f"-r{resolution}",
+            pdf_path,
+        ]
+        ghostscript.Ghostscript(*gs_command)

camelot/backends/image_conversion.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+
+from .poppler_backend import PopplerBackend
+from .ghostscript_backend import GhostscriptBackend
+
+BACKENDS = {"poppler": PopplerBackend, "ghostscript": GhostscriptBackend}
+
+
+class ImageConversionBackend(object):
+    def __init__(self, backend="poppler", use_fallback=True):
+        if backend not in BACKENDS.keys():
+            raise ValueError(f"Image conversion backend '{backend}' not supported")
+
+        self.backend = backend
+        self.use_fallback = use_fallback
+        self.fallbacks = list(filter(lambda x: x != backend, BACKENDS.keys()))
+
+    def convert(self, pdf_path, png_path):
+        try:
+            converter = BACKENDS[self.backend]()
+            converter.convert(pdf_path, png_path)
+        except Exception as e:
+            import sys
+
+            if self.use_fallback:
+                for fallback in self.fallbacks:
+                    try:
+                        converter = BACKENDS[fallback]()
+                        converter.convert(pdf_path, png_path)
+                    except Exception as e:
+                        raise type(e)(
+                            str(e) + f" with image conversion backend '{fallback}'"
+                        ).with_traceback(sys.exc_info()[2])
+                        continue
+                    else:
+                        break
+            else:
+                raise type(e)(
+                    str(e) + f" with image conversion backend '{self.backend}'"
+                ).with_traceback(sys.exc_info()[2])

camelot/backends/poppler_backend.py

@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+
+import shutil
+import subprocess
+
+
+class PopplerBackend(object):
+    def convert(self, pdf_path, png_path):
+        pdftopng_executable = shutil.which("pdftopng")
+        if pdftopng_executable is None:
+            raise OSError(
+                "pdftopng is not installed. You can install it using the 'pip install pdftopng' command."
+            )
+
+        pdftopng_command = [pdftopng_executable, pdf_path, png_path]
+
+        try:
+            subprocess.check_output(
+                " ".join(pdftopng_command), stderr=subprocess.STDOUT, shell=True
+            )
+        except subprocess.CalledProcessError as e:
+            raise ValueError(e.output)

camelot/cli.py

@@ -43,7 +43,7 @@ pass_config = click.make_pass_decorator(Config)
 @click.option(
     "-f",
     "--format",
-    type=click.Choice(["csv", "json", "excel", "html", "sqlite"]),
+    type=click.Choice(["csv", "excel", "html", "json", "markdown", "sqlite"]),
     help="Output file format.",
 )
 @click.option("-z", "--zip", is_flag=True, help="Create ZIP archive.")

camelot/core.py

@@ -55,7 +55,9 @@ class TextEdge(object):
         x = round(self.x, 2)
         y0 = round(self.y0, 2)
         y1 = round(self.y1, 2)
-        return f"<TextEdge x={x} y0={y0} y1={y1} align={self.align} valid={self.is_valid}>"
+        return (
+            f"<TextEdge x={x} y0={y0} y1={y1} align={self.align} valid={self.is_valid}>"
+        )
 
     def update_coords(self, x, y0, edge_tol=50):
         """Updates the text edge's x and bottom y coordinates and sets
@@ -102,8 +104,7 @@ class TextEdges(object):
         return None
 
     def add(self, textline, align):
-        """Adds a new text edge to the current dict.
-        """
+        """Adds a new text edge to the current dict."""
         x = self.get_x_coord(textline, align)
         y0 = textline.y0
         y1 = textline.y1
@@ -111,8 +112,7 @@ class TextEdges(object):
         self._textedges[align].append(te)
 
     def update(self, textline):
-        """Updates an existing text edge in the current dict.
-        """
+        """Updates an existing text edge in the current dict."""
         for align in ["left", "right", "middle"]:
             x_coord = self.get_x_coord(textline, align)
             idx = self.find(x_coord, align)
@@ -288,10 +288,10 @@ class Cell(object):
         self._text = ""
 
     def __repr__(self):
-        x1 = round(self.x1, 2)
-        y1 = round(self.y1, 2)
-        x2 = round(self.x2, 2)
-        y2 = round(self.y2, 2)
+        x1 = round(self.x1)
+        y1 = round(self.y1)
+        x2 = round(self.x2)
+        y2 = round(self.y2)
         return f"<Cell x1={x1} y1={y1} x2={x2} y2={y2}>"
 
     @property
@@ -304,8 +304,7 @@ class Cell(object):
 
     @property
     def bound(self):
-        """The number of sides on which the cell is bounded.
-        """
+        """The number of sides on which the cell is bounded."""
         return self.top + self.bottom + self.left + self.right
 
 
@@ -361,8 +360,7 @@ class Table(object):
 
     @property
     def data(self):
-        """Returns two-dimensional list of strings in table.
-        """
+        """Returns two-dimensional list of strings in table."""
         d = []
         for row in self.cells:
             d.append([cell.text.strip() for cell in row])
@@ -383,8 +381,7 @@ class Table(object):
         return report
 
     def set_all_edges(self):
-        """Sets all table edges to True.
-        """
+        """Sets all table edges to True."""
         for row in self.cells:
             for cell in row:
                 cell.left = cell.right = cell.top = cell.bottom = True
@@ -526,8 +523,7 @@ class Table(object):
         return self
 
     def set_border(self):
-        """Sets table border edges to True.
-        """
+        """Sets table border edges to True."""
         for r in range(len(self.rows)):
             self.cells[r][0].left = True
             self.cells[r][len(self.cols) - 1].right = True
@@ -631,9 +627,24 @@ class Table(object):
 
         """
         html_string = self.df.to_html(**kwargs)
-        with open(path, "w") as f:
+        with open(path, "w", encoding="utf-8") as f:
             f.write(html_string)
 
+    def to_markdown(self, path, **kwargs):
+        """Writes Table to a Markdown file.
+
+        For kwargs, check :meth:`pandas.DataFrame.to_markdown`.
+
+        Parameters
+        ----------
+        path : str
+            Output filepath.
+
+        """
+        md_string = self.df.to_markdown(**kwargs)
+        with open(path, "w", encoding="utf-8") as f:
+            f.write(md_string)
+
     def to_sqlite(self, path, **kwargs):
         """Writes Table to sqlite database.
 
@@ -715,7 +726,7 @@ class TableList(object):
         path : str
             Output filepath.
         f : str
-            File format. Can be csv, json, excel, html and sqlite.
+            File format. Can be csv, excel, html, json, markdown or sqlite.
         compress : bool
             Whether or not to add files to a ZIP archive.
 
@@ -728,7 +739,7 @@ class TableList(object):
 
         kwargs = {"path": path, "dirname": dirname, "root": root, "ext": ext}
 
-        if f in ["csv", "json", "html"]:
+        if f in ["csv", "html", "json", "markdown"]:
             self._write_file(f=f, **kwargs)
             if compress:
                 self._compress_dir(**kwargs)

camelot/ext/ghostscript/COPYING

@@ -1,674 +0,0 @@
-                    GNU GENERAL PUBLIC LICENSE
-                       Version 3, 29 June 2007
-
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- Everyone is permitted to copy and distribute verbatim copies
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-  Nothing in this License shall be construed as excluding or limiting
-any implied license or other defenses to infringement that may
-otherwise be available to you under applicable patent law.
-
-  12. No Surrender of Others' Freedom.
-
-  If conditions are imposed on you (whether by court order, agreement or
-otherwise) that contradict the conditions of this License, they do not
-excuse you from the conditions of this License.  If you cannot convey a
-covered work so as to satisfy simultaneously your obligations under this
-License and any other pertinent obligations, then as a consequence you may
-not convey it at all.  For example, if you agree to terms that obligate you
-to collect a royalty for further conveying from those to whom you convey
-the Program, the only way you could satisfy both those terms and this
-License would be to refrain entirely from conveying the Program.
-
-  13. Use with the GNU Affero General Public License.
-
-  Notwithstanding any other provision of this License, you have
-permission to link or combine any covered work with a work licensed
-under version 3 of the GNU Affero General Public License into a single
-combined work, and to convey the resulting work.  The terms of this
-License will continue to apply to the part which is the covered work,
-but the special requirements of the GNU Affero General Public License,
-section 13, concerning interaction through a network will apply to the
-combination as such.
-
-  14. Revised Versions of this License.
-
-  The Free Software Foundation may publish revised and/or new versions of
-the GNU General Public License from time to time.  Such new versions will
-be similar in spirit to the present version, but may differ in detail to
-address new problems or concerns.
-
-  Each version is given a distinguishing version number.  If the
-Program specifies that a certain numbered version of the GNU General
-Public License "or any later version" applies to it, you have the
-option of following the terms and conditions either of that numbered
-version or of any later version published by the Free Software
-Foundation.  If the Program does not specify a version number of the
-GNU General Public License, you may choose any version ever published
-by the Free Software Foundation.
-
-  If the Program specifies that a proxy can decide which future
-versions of the GNU General Public License can be used, that proxy's
-public statement of acceptance of a version permanently authorizes you
-to choose that version for the Program.
-
-  Later license versions may give you additional or different
-permissions.  However, no additional obligations are imposed on any
-author or copyright holder as a result of your choosing to follow a
-later version.
-
-  15. Disclaimer of Warranty.
-
-  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
-APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
-HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
-OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
-THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
-IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
-ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
-
-  16. Limitation of Liability.
-
-  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
-THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
-GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
-USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
-DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
-PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
-EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
-SUCH DAMAGES.
-
-  17. Interpretation of Sections 15 and 16.
-
-  If the disclaimer of warranty and limitation of liability provided
-above cannot be given local legal effect according to their terms,
-reviewing courts shall apply local law that most closely approximates
-an absolute waiver of all civil liability in connection with the
-Program, unless a warranty or assumption of liability accompanies a
-copy of the Program in return for a fee.
-
-                     END OF TERMS AND CONDITIONS
-
-            How to Apply These Terms to Your New Programs
-
-  If you develop a new program, and you want it to be of the greatest
-possible use to the public, the best way to achieve this is to make it
-free software which everyone can redistribute and change under these terms.
-
-  To do so, attach the following notices to the program.  It is safest
-to attach them to the start of each source file to most effectively
-state the exclusion of warranty; and each file should have at least
-the "copyright" line and a pointer to where the full notice is found.
-
-    <one line to give the program's name and a brief idea of what it does.>
-    Copyright (C) <year>  <name of author>
-
-    This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-Also add information on how to contact you by electronic and paper mail.
-
-  If the program does terminal interaction, make it output a short
-notice like this when it starts in an interactive mode:
-
-    <program>  Copyright (C) <year>  <name of author>
-    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-    This is free software, and you are welcome to redistribute it
-    under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License.  Of course, your program's commands
-might be different; for a GUI interface, you would use an "about box".
-
-  You should also get your employer (if you work as a programmer) or school,
-if any, to sign a "copyright disclaimer" for the program, if necessary.
-For more information on this, and how to apply and follow the GNU GPL, see
-<http://www.gnu.org/licenses/>.
-
-  The GNU General Public License does not permit incorporating your program
-into proprietary programs.  If your program is a subroutine library, you
-may consider it more useful to permit linking proprietary applications with
-the library.  If this is what you want to do, use the GNU Lesser General
-Public License instead of this License.  But first, please read
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.

camelot/ext/ghostscript/__init__.py

@@ -1,99 +0,0 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-"""
-ghostscript - A Python interface for the Ghostscript interpreter C-API
-"""
-#
-# Modifications 2018 by Vinayak Mehta <vmehta94@gmail.com>
-# Copyright 2010-2018 by Hartmut Goebel <h.goebel@crazy-compilers.com>
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-
-from . import _gsprint as gs
-
-
-__author__ = "Hartmut Goebel <h.goebel@crazy-compilers.com>"
-__copyright__ = "Copyright 2010-2018 by Hartmut Goebel <h.goebel@crazy-compilers.com>"
-__license__ = "GNU General Public License version 3 (GPL v3)"
-__version__ = "0.6"
-
-
-class __Ghostscript(object):
-    def __init__(self, instance, args, stdin=None, stdout=None, stderr=None):
-        self._initialized = False
-        self._callbacks = None
-        if stdin or stdout or stderr:
-            self.set_stdio(stdin, stdout, stderr)
-        rc = gs.init_with_args(instance, args)
-        self._initialized = True
-        if rc == gs.e_Quit:
-            self.exit()
-
-    def __enter__(self):
-        return self
-
-    def __exit__(self, *args):
-        self.exit()
-
-    def set_stdio(self, stdin=None, stdout=None, stderr=None):
-        """Set stdin, stdout and stderr of the ghostscript interpreter.
-
-        The ``stdin`` stream has to support the ``readline()``
-        interface. The ``stdout`` and ``stderr`` streams have to
-        support the ``write()`` and ``flush()`` interface.
-
-        Please note that this does not affect the input- and output-
-        streams of the devices. Esp. setting stdout does not allow
-        catching the devise-output even when using ``-sOutputFile=-``.
-
-        """
-        global __instance__
-        self._callbacks = (
-            stdin and gs._wrap_stdin(stdin) or None,
-            stdout and gs._wrap_stdout(stdout) or None,
-            stderr and gs._wrap_stderr(stderr) or None,
-        )
-        gs.set_stdio(__instance__, *self._callbacks)
-
-    def __del__(self):
-        self.exit()
-
-    def exit(self):
-        global __instance__
-        if self._initialized:
-            if __instance__ is not None:
-                gs.exit(__instance__)
-                gs.delete_instance(__instance__)
-                __instance__ = None
-            self._initialized = False
-
-
-def Ghostscript(*args, **kwargs):
-    """Factory function for setting up a Ghostscript instance
-    """
-    global __instance__
-    # Ghostscript only supports a single instance
-    if __instance__ is None:
-        __instance__ = gs.new_instance()
-    return __Ghostscript(
-        __instance__,
-        args,
-        stdin=kwargs.get("stdin", None),
-        stdout=kwargs.get("stdout", None),
-        stderr=kwargs.get("stderr", None),
-    )
-
-
-__instance__ = None

camelot/ext/ghostscript/_gsprint.py

@@ -1,270 +0,0 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-"""
-ghostscript._gsprint - A low-level interface to the Ghostscript C-API using ctypes
-"""
-#
-# Modifications 2018 by Vinayak Mehta <vmehta94@gmail.com>
-# Copyright 2010-2018 by Hartmut Goebel <h.goebel@crazy-compilers.com>
-#
-# Display_callback Structure by Lasse Fister <commander@graphicore.de> in 2013
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-
-import sys
-from ctypes import *
-
-
-# base/gserrors.h
-#
-# Internal code for a normal exit when usage info is displayed.
-# This allows Window versions of Ghostscript to pause until
-# the message can be read.
-#
-e_Info = -110
-
-#
-# Internal code for the .quit operator.
-# The real quit code is an integer on the operand stack.
-# gs_interpret returns this only for a .quit with a zero exit code.
-#
-e_Quit = -101
-
-__author__ = "Hartmut Goebel <h.goebel@crazy-compilers.com>"
-__copyright__ = "Copyright 2010-2018 by Hartmut Goebel <h.goebel@crazy-compilers.com>"
-__license__ = "GNU General Public License version 3 (GPL v3)"
-__version__ = "0.6"
-
-gs_main_instance = c_void_p
-display_callback = c_void_p
-
-# https://www.ghostscript.com/doc/current/API.htm
-
-
-class GhostscriptError(Exception):
-    def __init__(self, ecode):
-        self.code = ecode
-
-
-def new_instance():
-    """Create a new instance of Ghostscript
-
-    This instance is passed to most other API functions.
-    """
-    # :todo: The caller_handle will be provided to callback functions.
-    display_callback = None
-    instance = gs_main_instance()
-    rc = libgs.gsapi_new_instance(pointer(instance), display_callback)
-    if rc != 0:
-        raise GhostscriptError(rc)
-    return instance
-
-
-def delete_instance(instance):
-    """Destroy an instance of Ghostscript
-
-    Before you call this, Ghostscript must have finished.
-    If Ghostscript has been initialised, you must call exit()
-    before delete_instance()
-    """
-    return libgs.gsapi_delete_instance(instance)
-
-
-if sys.platform == "win32":
-    c_stdstream_call_t = WINFUNCTYPE(c_int, gs_main_instance, POINTER(c_char), c_int)
-else:
-    c_stdstream_call_t = CFUNCTYPE(c_int, gs_main_instance, POINTER(c_char), c_int)
-
-
-def _wrap_stdin(infp):
-    """Wrap a filehandle into a C function to be used as `stdin` callback
-    for ``set_stdio``. The filehandle has to support the readline() method.
-    """
-
-    def _wrap(instance, dest, count):
-        try:
-            data = infp.readline(count)
-        except:
-            count = -1
-        else:
-            if not data:
-                count = 0
-            else:
-                count = len(data)
-                memmove(dest, c_char_p(data), count)
-        return count
-
-    return c_stdstream_call_t(_wrap)
-
-
-def _wrap_stdout(outfp):
-    """Wrap a filehandle into a C function to be used as `stdout` or
-    `stderr` callback for ``set_stdio``. The filehandle has to support the
-    write() and flush() methods.
-    """
-
-    def _wrap(instance, str, count):
-        outfp.write(str[:count])
-        outfp.flush()
-        return count
-
-    return c_stdstream_call_t(_wrap)
-
-
-_wrap_stderr = _wrap_stdout
-
-
-def set_stdio(instance, stdin, stdout, stderr):
-    """Set the callback functions for stdio.
-
-    ``stdin``, ``stdout`` and ``stderr`` have to be ``ctypes``
-    callback functions matching the ``_gsprint.c_stdstream_call_t``
-    prototype. You may want to use _wrap_* to wrap file handles.
-
-    Note 1: This function only changes stdio of the Postscript
-    interpreter, not that of the devices.
-
-    Note 2: Make sure you keep references to C function objects
-    as long as they are used from C code. Otherwise they may be
-    garbage collected, crashing your program when a callback is made.
-
-    The ``stdin`` callback function should return the number of
-    characters read, `0` for EOF, or `-1` for error. The `stdout` and
-    `stderr` callback functions should return the number of characters
-    written.
-
-    You may pass ``None`` for any of stdin, stdout or stderr , in which
-    case the system stdin, stdout resp. stderr will be used.
-    """
-    rc = libgs.gsapi_set_stdio(instance, stdin, stdout, stderr)
-    if rc not in (0, e_Quit, e_Info):
-        raise GhostscriptError(rc)
-    return rc
-
-
-def init_with_args(instance, argv):
-    """Initialise the interpreter
-
-    1. If quit or EOF occur during init_with_args(), the return value
-       will be e_Quit. This is not an error. You must call exit() and
-       must not call any other functions.
-
-    2. If usage info should be displayed, the return value will be
-       e_Info which is not an error. Do not call exit().
-
-    3. Under normal conditions this returns 0. You would then call one
-       or more run_*() functions and then finish with exit()
-    """
-    ArgArray = c_char_p * len(argv)
-    c_argv = ArgArray(*argv)
-    rc = libgs.gsapi_init_with_args(instance, len(argv), c_argv)
-    if rc not in (0, e_Quit, e_Info):
-        raise GhostscriptError(rc)
-    return rc
-
-
-def exit(instance):
-    """Exit the interpreter
-
-    This must be called on shutdown if init_with_args() has been
-    called, and just before delete_instance()
-    """
-    rc = libgs.gsapi_exit(instance)
-    if rc != 0:
-        raise GhostscriptError(rc)
-    return rc
-
-
-def __win32_finddll():
-    try:
-        import winreg
-    except ImportError:
-        # assume Python 2
-        from _winreg import (
-            OpenKey,
-            CloseKey,
-            EnumKey,
-            QueryValueEx,
-            QueryInfoKey,
-            HKEY_LOCAL_MACHINE,
-        )
-    else:
-        from winreg import (
-            OpenKey,
-            CloseKey,
-            EnumKey,
-            QueryValueEx,
-            QueryInfoKey,
-            HKEY_LOCAL_MACHINE,
-        )
-
-    from distutils.version import LooseVersion
-    import os
-
-    dlls = []
-    # Look up different variants of Ghostscript and take the highest
-    # version for which the DLL is to be found in the filesystem.
-    for key_name in (
-        "AFPL Ghostscript",
-        "Aladdin Ghostscript",
-        "GNU Ghostscript",
-        "GPL Ghostscript",
-    ):
-        try:
-            k1 = OpenKey(HKEY_LOCAL_MACHINE, "Software\\%s" % key_name)
-            for num in range(0, QueryInfoKey(k1)[0]):
-                version = EnumKey(k1, num)
-                try:
-                    k2 = OpenKey(k1, version)
-                    dll_path = QueryValueEx(k2, "GS_DLL")[0]
-                    CloseKey(k2)
-                    if os.path.exists(dll_path):
-                        dlls.append((LooseVersion(version), dll_path))
-                except WindowsError:
-                    pass
-            CloseKey(k1)
-        except WindowsError:
-            pass
-    if dlls:
-        dlls.sort()
-        return dlls[-1][-1]
-    else:
-        return None
-
-
-if sys.platform == "win32":
-    libgs = __win32_finddll()
-    if not libgs:
-        import ctypes.util
-
-        libgs = ctypes.util.find_library(
-            "".join(("gsdll", str(ctypes.sizeof(ctypes.c_voidp) * 8), ".dll"))
-        )  # finds in %PATH%
-    if not libgs:
-        raise RuntimeError("Please make sure that Ghostscript is installed")
-    libgs = windll.LoadLibrary(libgs)
-else:
-    try:
-        libgs = cdll.LoadLibrary("libgs.so")
-    except OSError:
-        # shared object file not found
-        import ctypes.util
-
-        libgs = ctypes.util.find_library("gs")
-        if not libgs:
-            raise RuntimeError("Please make sure that Ghostscript is installed")
-        libgs = cdll.LoadLibrary(libgs)
-
-del __win32_finddll

camelot/handlers.py

@@ -38,8 +38,8 @@ class PDFHandler(object):
         if is_url(filepath):
             filepath = download_url(filepath)
         self.filepath = filepath
-        if not filepath.lower().endswith(".pdf"):
-            raise NotImplementedError("File format not supported")
+        # if not filepath.lower().endswith(".pdf"):
+        #     raise NotImplementedError("File format not supported")
 
         if password is None:
             self.password = ""
@@ -47,9 +47,9 @@ class PDFHandler(object):
             self.password = password
             if sys.version_info[0] < 3:
                 self.password = self.password.encode("ascii")
-        self.pages = self._get_pages(self.filepath, pages)
+        self.pages = self._get_pages(pages)
 
-    def _get_pages(self, filepath, pages):
+    def _get_pages(self, pages):
         """Converts pages string to list of ints.
 
         Parameters
@@ -67,12 +67,16 @@ class PDFHandler(object):
 
         """
         page_numbers = []
+
         if pages == "1":
             page_numbers.append({"start": 1, "end": 1})
         else:
-            infile = PdfFileReader(open(filepath, "rb"), strict=False)
+            with open(self.filepath, "rb") as f:
+                infile = PdfFileReader(f, strict=False)
+
                 if infile.isEncrypted:
                     infile.decrypt(self.password)
+
                 if pages == "all":
                     page_numbers.append({"start": 1, "end": infile.getNumPages()})
                 else:
@@ -84,6 +88,7 @@ class PDFHandler(object):
                             page_numbers.append({"start": int(a), "end": int(b)})
                         else:
                             page_numbers.append({"start": int(r), "end": int(r)})
+
         P = []
         for p in page_numbers:
             P.extend(range(p["start"], p["end"] + 1))
@@ -122,7 +127,8 @@ class PDFHandler(object):
             if rotation != "":
                 fpath_new = "".join([froot.replace("page", "p"), "_rotated", fext])
                 os.rename(fpath, fpath_new)
-                infile = PdfFileReader(open(fpath_new, "rb"), strict=False)
+                instream = open(fpath_new, "rb")
+                infile = PdfFileReader(instream, strict=False)
                 if infile.isEncrypted:
                     infile.decrypt(self.password)
                 outfile = PdfFileWriter()
@@ -134,6 +140,7 @@ class PDFHandler(object):
                 outfile.addPage(p)
                 with open(fpath, "wb") as f:
                     outfile.write(f)
+                instream.close()
 
     def parse(
         self, flavor="lattice", suppress_stdout=False, layout_kwargs={}, **kwargs
@@ -163,9 +170,7 @@ class PDFHandler(object):
         with TemporaryDirectory() as tempdir:
             for p in self.pages:
                 self._save_page(self.filepath, p, tempdir)
-            pages = [
-                os.path.join(tempdir, f"page-{p}.pdf") for p in self.pages
-            ]
+            pages = [os.path.join(tempdir, f"page-{p}.pdf") for p in self.pages]
             parser = Lattice(**kwargs) if flavor == "lattice" else Stream(**kwargs)
             for p in pages:
                 t = parser.extract_tables(

camelot/parsers/base.py

@@ -6,8 +6,7 @@ from ..utils import get_page_layout, get_text_objects
 
 
 class BaseParser(object):
-    """Defines a base parser.
-    """
+    """Defines a base parser."""
 
     def _generate_layout(self, filename, layout_kwargs):
         self.filename = filename
@@ -18,3 +17,4 @@ class BaseParser(object):
         self.vertical_text = get_text_objects(self.layout, ltype="vertical_text")
         self.pdf_width, self.pdf_height = self.dimensions
         self.rootname, __ = os.path.splitext(self.filename)
+        self.imagename = "".join([self.rootname, ".png"])

camelot/parsers/lattice.py

@@ -6,7 +6,6 @@ import copy
 import locale
 import logging
 import warnings
-import subprocess
 
 import numpy as np
 import pandas as pd
@@ -29,6 +28,7 @@ from ..image_processing import (
     find_contours,
     find_joints,
 )
+from ..backends.image_conversion import BACKENDS
 
 
 logger = logging.getLogger("camelot")
@@ -111,7 +111,8 @@ class Lattice(BaseParser):
         threshold_constant=-2,
         iterations=0,
         resolution=300,
-        **kwargs
+        backend="ghostscript",
+        **kwargs,
     ):
         self.table_regions = table_regions
         self.table_areas = table_areas
@@ -128,6 +129,37 @@ class Lattice(BaseParser):
         self.threshold_constant = threshold_constant
         self.iterations = iterations
         self.resolution = resolution
+        self.backend = Lattice._get_backend(backend)
+
+    @staticmethod
+    def _get_backend(backend):
+        def implements_convert():
+            methods = [
+                method for method in dir(backend) if method.startswith("__") is False
+            ]
+            return "convert" in methods
+
+        if isinstance(backend, str):
+            if backend not in BACKENDS.keys():
+                raise NotImplementedError(
+                    f"Unknown backend '{backend}' specified. Please use either 'poppler' or 'ghostscript'."
+                )
+
+            if backend == "ghostscript":
+                warnings.warn(
+                    "'ghostscript' will be replaced by 'poppler' as the default image conversion"
+                    " backend in v0.12.0. You can try out 'poppler' with backend='poppler'.",
+                    DeprecationWarning,
+                )
+
+            return BACKENDS[backend]()
+        else:
+            if not implements_convert():
+                raise NotImplementedError(
+                    f"'{backend}' must implement a 'convert' method"
+                )
+
+            return backend
 
     @staticmethod
     def _reduce_index(t, idx, shift_text):
@@ -207,19 +239,6 @@ class Lattice(BaseParser):
                                 t.cells[i][j].text = t.cells[i - 1][j].text
         return t
 
-    def _generate_image(self):
-        from ..ext.ghostscript import Ghostscript
-
-        self.imagename = "".join([self.rootname, ".png"])
-        gs_call = "-q -sDEVICE=png16m -o {} -r300 {}".format(
-            self.imagename, self.filename
-        )
-        gs_call = gs_call.encode().split()
-        null = open(os.devnull, "wb")
-        with Ghostscript(*gs_call, stdout=null) as gs:
-            pass
-        null.close()
-
     def _generate_table_bbox(self):
         def scale_areas(areas):
             scaled_areas = []
@@ -399,7 +418,8 @@ class Lattice(BaseParser):
                 )
             return []
 
-        self._generate_image()
+        self.backend.convert(self.filename, self.imagename)
+
         self._generate_table_bbox()
 
         _tables = []

camelot/parsers/stream.py

@@ -65,7 +65,7 @@ class Stream(BaseParser):
         edge_tol=50,
         row_tol=2,
         column_tol=0,
-        **kwargs
+        **kwargs,
     ):
         self.table_regions = table_regions
         self.table_areas = table_areas
@@ -121,6 +121,7 @@ class Stream(BaseParser):
         row_y = 0
         rows = []
         temp = []
+
         for t in text:
             # is checking for upright necessary?
             # if t.get_text().strip() and all([obj.upright for obj in t._objs if
@@ -131,7 +132,9 @@ class Stream(BaseParser):
                     temp = []
                     row_y = t.y0
                 temp.append(t)
+
         rows.append(sorted(temp, key=lambda t: t.x0))
+        if len(rows) > 1:
             __ = rows.pop(0)  # TODO: hacky
         return rows
 
@@ -345,6 +348,9 @@ class Stream(BaseParser):
         else:
             # calculate mode of the list of number of elements in
             # each row to guess the number of columns
+            if not len(elements):
+                cols = [(text_x_min, text_x_max)]
+            else:
                 ncols = max(set(elements), key=elements.count)
                 if ncols == 1:
                     # if mode is 1, the page usually contains not tables
@@ -356,10 +362,10 @@ class Stream(BaseParser):
                     if len(elements):
                         ncols = max(set(elements), key=elements.count)
                     else:
-                    warnings.warn(
-                        f"No tables found in table area {table_idx + 1}"
-                    )
-            cols = [(t.x0, t.x1) for r in rows_grouped if len(r) == ncols for t in r]
+                        warnings.warn(f"No tables found in table area {table_idx + 1}")
+                cols = [
+                    (t.x0, t.x1) for r in rows_grouped if len(r) == ncols for t in r
+                ]
                 cols = self._merge_columns(sorted(cols), column_tol=self.column_tol)
                 inner_text = []
                 for i in range(1, len(cols)):

camelot/plotting.py

@@ -34,16 +34,18 @@ class PlotMethods(object):
             raise ImportError("matplotlib is required for plotting.")
 
         if table.flavor == "lattice" and kind in ["textedge"]:
-            raise NotImplementedError(
-                f"Lattice flavor does not support kind='{kind}'"
-            )
+            raise NotImplementedError(f"Lattice flavor does not support kind='{kind}'")
         elif table.flavor == "stream" and kind in ["joint", "line"]:
-            raise NotImplementedError(
-                f"Stream flavor does not support kind='{kind}'"
-            )
+            raise NotImplementedError(f"Stream flavor does not support kind='{kind}'")
 
         plot_method = getattr(self, kind)
-        return plot_method(table)
+        fig = plot_method(table)
+
+        if filename is not None:
+            fig.savefig(filename)
+            return None
+
+        return fig
 
     def text(self, table):
         """Generates a plot for all text elements present

camelot/utils.py

@@ -14,7 +14,7 @@ import numpy as np
 from pdfminer.pdfparser import PDFParser
 from pdfminer.pdfdocument import PDFDocument
 from pdfminer.pdfpage import PDFPage
-from pdfminer.pdfpage import PDFTextExtractionNotAllowedError
+from pdfminer.pdfpage import PDFTextExtractionNotAllowed
 from pdfminer.pdfinterp import PDFResourceManager
 from pdfminer.pdfinterp import PDFPageInterpreter
 from pdfminer.converter import PDFPageAggregator
@@ -353,7 +353,7 @@ def text_in_bbox(bbox, text):
     Returns
     -------
     t_bbox : list
-        List of PDFMiner text objects that lie inside table.
+        List of PDFMiner text objects that lie inside table, discarding the overlapping ones
 
     """
     lb = (bbox[0], bbox[1])
@@ -364,7 +364,97 @@ def text_in_bbox(bbox, text):
         if lb[0] - 2 <= (t.x0 + t.x1) / 2.0 <= rt[0] + 2
         and lb[1] - 2 <= (t.y0 + t.y1) / 2.0 <= rt[1] + 2
     ]
-    return t_bbox
+
+    # Avoid duplicate text by discarding overlapping boxes
+    rest = {t for t in t_bbox}
+    for ba in t_bbox:
+        for bb in rest.copy():
+            if ba == bb:
+                continue
+            if bbox_intersect(ba, bb):
+                # if the intersection is larger than 80% of ba's size, we keep the longest
+                if (bbox_intersection_area(ba, bb) / bbox_area(ba)) > 0.8:
+                    if bbox_longer(bb, ba):
+                        rest.discard(ba)
+    unique_boxes = list(rest)
+
+    return unique_boxes
+
+
+def bbox_intersection_area(ba, bb) -> float:
+    """Returns area of the intersection of the bounding boxes of two PDFMiner objects.
+
+    Parameters
+    ----------
+    ba : PDFMiner text object
+    bb : PDFMiner text object
+
+    Returns
+    -------
+    intersection_area : float
+        Area of the intersection of the bounding boxes of both objects
+
+    """
+    x_left = max(ba.x0, bb.x0)
+    y_top = min(ba.y1, bb.y1)
+    x_right = min(ba.x1, bb.x1)
+    y_bottom = max(ba.y0, bb.y0)
+
+    if x_right < x_left or y_bottom > y_top:
+        return 0.0
+
+    intersection_area = (x_right - x_left) * (y_top - y_bottom)
+    return intersection_area
+
+
+def bbox_area(bb) -> float:
+    """Returns area of the bounding box of a PDFMiner object.
+
+    Parameters
+    ----------
+    bb : PDFMiner text object
+
+    Returns
+    -------
+    area : float
+        Area of the bounding box of the object
+
+    """
+    return (bb.x1 - bb.x0) * (bb.y1 - bb.y0)
+
+
+def bbox_intersect(ba, bb) -> bool:
+    """Returns True if the bounding boxes of two PDFMiner objects intersect.
+
+    Parameters
+    ----------
+    ba : PDFMiner text object
+    bb : PDFMiner text object
+
+    Returns
+    -------
+    overlaps : bool
+        True if the bounding boxes intersect
+
+    """
+    return ba.x1 >= bb.x0 and bb.x1 >= ba.x0 and ba.y1 >= bb.y0 and bb.y1 >= ba.y0
+
+
+def bbox_longer(ba, bb) -> bool:
+    """Returns True if the bounding box of the first PDFMiner object is longer or equal to the second.
+
+    Parameters
+    ----------
+    ba : PDFMiner text object
+    bb : PDFMiner text object
+
+    Returns
+    -------
+    longer : bool
+        True if the bounding box of the first object is longer or equal
+
+    """
+    return (ba.x1 - ba.x0) >= (bb.x1 - bb.x0)
 
 
 def merge_close_lines(ar, line_tol=2):
@@ -411,7 +501,7 @@ def text_strip(text, strip=""):
         return text
 
     stripped = re.sub(
-        fr"[{''.join(map(re.escape, strip))}]", "", text, re.UNICODE
+        fr"[{''.join(map(re.escape, strip))}]", "", text, flags=re.UNICODE
     )
     return stripped
 
@@ -748,23 +838,27 @@ def compute_whitespace(d):
 
 def get_page_layout(
     filename,
+    line_overlap=0.5,
     char_margin=1.0,
     line_margin=0.5,
     word_margin=0.1,
+    boxes_flow=0.5,
     detect_vertical=True,
     all_texts=True,
 ):
     """Returns a PDFMiner LTPage object and page dimension of a single
-    page pdf. See https://euske.github.io/pdfminer/ to get definitions
-    of kwargs.
+    page pdf. To get the definitions of kwargs, see
+    https://pdfminersix.rtfd.io/en/latest/reference/composable.html.
 
     Parameters
     ----------
     filename : string
         Path to pdf file.
+    line_overlap : float
     char_margin : float
     line_margin : float
     word_margin : float
+    boxes_flow : float
     detect_vertical : bool
     all_texts : bool
 
@@ -780,11 +874,15 @@ def get_page_layout(
         parser = PDFParser(f)
         document = PDFDocument(parser)
         if not document.is_extractable:
-            raise PDFTextExtractionNotAllowedError(f"Text extraction is not allowed: {filename}")
+            raise PDFTextExtractionNotAllowed(
+                f"Text extraction is not allowed: {filename}"
+            )
         laparams = LAParams(
+            line_overlap=line_overlap,
             char_margin=char_margin,
             line_margin=line_margin,
             word_margin=word_margin,
+            boxes_flow=boxes_flow,
             detect_vertical=detect_vertical,
             all_texts=all_texts,
         )

docs/_themes/flask_theme_support.py

@@ -1,7 +1,19 @@
 # flasky pygments style based on tango style
 from pygments.style import Style
-from pygments.token import Keyword, Name, Comment, String, Error, \
-     Number, Operator, Generic, Whitespace, Punctuation, Other, Literal
+from pygments.token import (
+    Keyword,
+    Name,
+    Comment,
+    String,
+    Error,
+    Number,
+    Operator,
+    Generic,
+    Whitespace,
+    Punctuation,
+    Other,
+    Literal,
+)
 
 
 class FlaskyStyle(Style):
@@ -14,10 +26,8 @@ class FlaskyStyle(Style):
         Whitespace: "underline #f8f8f8",  # class: 'w'
         Error: "#a40000 border:#ef2929",  # class: 'err'
         Other: "#000000",  # class 'x'
-
         Comment: "italic #8f5902",  # class: 'c'
         Comment.Preproc: "noitalic",  # class: 'cp'
-
         Keyword: "bold #004461",  # class: 'k'
         Keyword.Constant: "bold #004461",  # class: 'kc'
         Keyword.Declaration: "bold #004461",  # class: 'kd'
@@ -25,12 +35,9 @@ class FlaskyStyle(Style):
         Keyword.Pseudo: "bold #004461",  # class: 'kp'
         Keyword.Reserved: "bold #004461",  # class: 'kr'
         Keyword.Type: "bold #004461",  # class: 'kt'
-
         Operator: "#582800",  # class: 'o'
         Operator.Word: "bold #004461",  # class: 'ow' - like keywords
-
         Punctuation: "bold #000000",  # class: 'p'
-
         # because special names such as Name.Class, Name.Function, etc.
         # are not recognized as such later in the parsing, we choose them
         # to look the same as ordinary variables.
@@ -53,12 +60,9 @@ class FlaskyStyle(Style):
         Name.Variable.Class: "#000000",  # class: 'vc' - to be revised
         Name.Variable.Global: "#000000",  # class: 'vg' - to be revised
         Name.Variable.Instance: "#000000",  # class: 'vi' - to be revised
-
         Number: "#990000",  # class: 'm'
-
         Literal: "#000000",  # class: 'l'
         Literal.Date: "#000000",  # class: 'ld'
-
         String: "#4e9a06",  # class: 's'
         String.Backtick: "#4e9a06",  # class: 'sb'
         String.Char: "#4e9a06",  # class: 'sc'
@@ -71,7 +75,6 @@ class FlaskyStyle(Style):
         String.Regex: "#4e9a06",  # class: 'sr'
         String.Single: "#4e9a06",  # class: 's1'
         String.Symbol: "#4e9a06",  # class: 'ss'
-
         Generic: "#000000",  # class: 'g'
         Generic.Deleted: "#a40000",  # class: 'gd'
         Generic.Emph: "italic #000000",  # class: 'ge'

docs/conf.py

@@ -22,8 +22,8 @@ import sys
 # sys.path.insert(0, os.path.abspath('..'))
 
 # Insert Camelot's path into the system.
-sys.path.insert(0, os.path.abspath('..'))
-sys.path.insert(0, os.path.abspath('_themes'))
+sys.path.insert(0, os.path.abspath(".."))
+sys.path.insert(0, os.path.abspath("_themes"))
 
 import camelot
 
@@ -38,33 +38,33 @@ import camelot
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    'sphinx.ext.autodoc',
-    'sphinx.ext.napoleon',
-    'sphinx.ext.intersphinx',
-    'sphinx.ext.todo',
-    'sphinx.ext.viewcode',
+    "sphinx.ext.autodoc",
+    "sphinx.ext.napoleon",
+    "sphinx.ext.intersphinx",
+    "sphinx.ext.todo",
+    "sphinx.ext.viewcode",
 ]
 
 # Add any paths that contain templates here, relative to this directory.
-templates_path = ['_templates']
+templates_path = ["_templates"]
 
 # The suffix(es) of source filenames.
 # You can specify multiple suffix as a list of string:
 #
 # source_suffix = ['.rst', '.md']
-source_suffix = '.rst'
+source_suffix = ".rst"
 
 # The encoding of source files.
 #
 # source_encoding = 'utf-8-sig'
 
 # The master toctree document.
-master_doc = 'index'
+master_doc = "index"
 
 # General information about the project.
-project = u'Camelot'
-copyright = u'2019, Camelot Developers'
-author = u'Vinayak Mehta'
+project = u"Camelot"
+copyright = u"2021, Camelot Developers"
+author = u"Vinayak Mehta"
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -94,7 +94,7 @@ language = None
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This patterns also effect to html_static_path and html_extra_path
-exclude_patterns = ['_build']
+exclude_patterns = ["_build"]
 
 # The reST default role (used for this markup: `text`) to use for all
 # documents.
@@ -114,7 +114,7 @@ add_module_names = True
 # show_authors = False
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'flask_theme_support.FlaskyStyle'
+pygments_style = "flask_theme_support.FlaskyStyle"
 
 # A list of ignored prefixes for module index sorting.
 # modindex_common_prefix = []
@@ -130,18 +130,18 @@ todo_include_todos = True
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = 'alabaster'
+html_theme = "alabaster"
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
 html_theme_options = {
-    'show_powered_by': False,
-    'github_user': 'camelot-dev',
-    'github_repo': 'camelot',
-    'github_banner': True,
-    'show_related': False,
-    'note_bg': '#FFF59C'
+    "show_powered_by": False,
+    "github_user": "camelot-dev",
+    "github_repo": "camelot",
+    "github_banner": True,
+    "show_related": False,
+    "note_bg": "#FFF59C",
 }
 
 # Add any paths that contain custom themes here, relative to this directory.
@@ -164,12 +164,12 @@ html_theme_options = {
 # The name of an image file (relative to this directory) to use as a favicon of
 # the docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
 # pixels large.
-html_favicon = '_static/favicon.ico'
+html_favicon = "_static/favicon.ico"
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+html_static_path = ["_static"]
 
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied
@@ -189,10 +189,21 @@ html_use_smartypants = True
 
 # Custom sidebar templates, maps document names to template names.
 html_sidebars = {
-    'index': ['sidebarintro.html', 'relations.html', 'sourcelink.html',
-              'searchbox.html', 'hacks.html'],
-    '**': ['sidebarlogo.html', 'localtoc.html', 'relations.html',
-           'sourcelink.html', 'searchbox.html', 'hacks.html']
+    "index": [
+        "sidebarintro.html",
+        "relations.html",
+        "sourcelink.html",
+        "searchbox.html",
+        "hacks.html",
+    ],
+    "**": [
+        "sidebarlogo.html",
+        "localtoc.html",
+        "relations.html",
+        "sourcelink.html",
+        "searchbox.html",
+        "hacks.html",
+    ],
 }
 
 # Additional templates that should be rendered to pages, maps page names to
@@ -249,7 +260,7 @@ html_show_copyright = True
 # html_search_scorer = 'scorer.js'
 
 # Output file base name for HTML help builder.
-htmlhelp_basename = 'Camelotdoc'
+htmlhelp_basename = "Camelotdoc"
 
 # -- Options for LaTeX output ---------------------------------------------
 
@@ -257,15 +268,12 @@ latex_elements = {
     # The paper size ('letterpaper' or 'a4paper').
     #
     # 'papersize': 'letterpaper',
-
     # The font size ('10pt', '11pt' or '12pt').
     #
     # 'pointsize': '10pt',
-
     # Additional stuff for the LaTeX preamble.
     #
     # 'preamble': '',
-
     # Latex figure (float) alignment
     #
     # 'figure_align': 'htbp',
@@ -275,8 +283,7 @@ latex_elements = {
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-    (master_doc, 'Camelot.tex', u'Camelot Documentation',
-     u'Vinayak Mehta', 'manual'),
+    (master_doc, "Camelot.tex", u"Camelot Documentation", u"Vinayak Mehta", "manual"),
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
@@ -316,10 +323,7 @@ latex_documents = [
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [
-    (master_doc, 'Camelot', u'Camelot Documentation',
-     [author], 1)
-]
+man_pages = [(master_doc, "Camelot", u"Camelot Documentation", [author], 1)]
 
 # If true, show URL addresses after external links.
 #
@@ -332,9 +336,15 @@ man_pages = [
 # (source start file, target name, title, author,
 #  dir menu entry, description, category)
 texinfo_documents = [
-    (master_doc, 'Camelot', u'Camelot Documentation',
-     author, 'Camelot', 'One line description of project.',
-     'Miscellaneous'),
+    (
+        master_doc,
+        "Camelot",
+        u"Camelot Documentation",
+        author,
+        "Camelot",
+        "One line description of project.",
+        "Miscellaneous",
+    ),
 ]
 
 # Documents to append as an appendix to all manuals.
@@ -356,6 +366,6 @@ texinfo_documents = [
 
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {
-    'https://docs.python.org/2': None,
-    'http://pandas.pydata.org/pandas-docs/stable': None
+    "https://docs.python.org/2": None,
+    "http://pandas.pydata.org/pandas-docs/stable": None,
 }

docs/index.rst

@@ -36,15 +36,15 @@ Release v\ |version|. (:ref:`Installation <install>`)
 .. image:: https://img.shields.io/badge/continous%20quality-deepsource-lightgrey
     :target: https://deepsource.io/gh/camelot-dev/camelot/?ref=repository-badge
 
-**Camelot** is a Python library that makes it easy for *anyone* to extract tables from PDF files!
+**Camelot** is a Python library that can help you extract tables from PDFs!
 
-.. note:: You can also check out `Excalibur`_, which is a web interface for Camelot!
+.. note:: You can also check out `Excalibur`_, the web interface to Camelot!
 
 .. _Excalibur: https://github.com/camelot-dev/excalibur
 
 ----
 
-**Here's how you can extract tables from PDF files.** Check out the PDF used in this example `here`_.
+**Here's how you can extract tables from PDFs.** You can check out the PDF used in this example `here`_.
 
 .. _here: _static/pdf/foo.pdf
 
@@ -54,7 +54,7 @@ Release v\ |version|. (:ref:`Installation <install>`)
     >>> tables = camelot.read_pdf('foo.pdf')
     >>> tables
     <TableList n=1>
-    >>> tables.export('foo.csv', f='csv', compress=True) # json, excel, html
+    >>> tables.export('foo.csv', f='csv', compress=True) # json, excel, html, markdown, sqlite
     >>> tables[0]
     <Table shape=(7, 7)>
     >>> tables[0].parsing_report
@@ -64,42 +64,44 @@ Release v\ |version|. (:ref:`Installation <install>`)
         'order': 1,
         'page': 1
     }
-    >>> tables[0].to_csv('foo.csv') # to_json, to_excel, to_html
+    >>> tables[0].to_csv('foo.csv') # to_json, to_excel, to_html, to_markdown, to_sqlite
     >>> tables[0].df # get a pandas DataFrame!
 
 .. csv-table::
   :file: _static/csv/foo.csv
 
-There's a :ref:`command-line interface <cli>` too!
+Camelot also comes packaged with a :ref:`command-line interface <cli>`!
 
 .. note:: Camelot only works with text-based PDFs and not scanned documents. (As Tabula `explains`_, "If you can click and drag to select text in your table in a PDF viewer, then your PDF is text-based".)
 
+You can check out some frequently asked questions :ref:`here <faq>`.
+
 .. _explains: https://github.com/tabulapdf/tabula#why-tabula
 
 Why Camelot?
 ------------
 
-- **You are in control.** Unlike other libraries and tools which either give a nice output or fail miserably (with no in-between), Camelot gives you the power to tweak table extraction. (This is important since everything in the real world, including PDF table extraction, is fuzzy.)
-- *Bad* tables can be discarded based on **metrics** like accuracy and whitespace, without ever having to manually look at each table.
-- Each table is a **pandas DataFrame**, which seamlessly integrates into `ETL and data analysis workflows`_.
-- **Export** to multiple formats, including JSON, Excel and HTML.
-
-See `comparison with other PDF table extraction libraries and tools`_.
+- **Configurability**: Camelot gives you control over the table extraction process with :ref:`tweakable settings <advanced>`.
+- **Metrics**: You can discard bad tables based on metrics like accuracy and whitespace, without having to manually look at each table.
+- **Output**: Each table is extracted into a **pandas DataFrame**, which seamlessly integrates into `ETL and data analysis workflows`_. You can also export tables to multiple formats, which include CSV, JSON, Excel, HTML, Markdown, and Sqlite.
 
 .. _ETL and data analysis workflows: https://gist.github.com/vinayak-mehta/e5949f7c2410a0e12f25d3682dc9e873
-.. _comparison with other PDF table extraction libraries and tools: https://github.com/camelot-dev/camelot/wiki/Comparison-with-other-PDF-Table-Extraction-libraries-and-tools
 
-Support us on OpenCollective
-----------------------------
+See `comparison with similar libraries and tools`_.
 
-If Camelot helped you extract tables from PDFs, please consider supporting its development by `becoming a backer or a sponsor on OpenCollective`_!
+.. _comparison with similar libraries and tools: https://github.com/camelot-dev/camelot/wiki/Comparison-with-other-PDF-Table-Extraction-libraries-and-tools
 
-.. _becoming a backer or a sponsor on OpenCollective: https://opencollective.com/camelot
+Support the development
+-----------------------
+
+If Camelot has helped you, please consider supporting its development with a one-time or monthly donation `on OpenCollective`_!
+
+.. _on OpenCollective: https://opencollective.com/camelot
 
 The User Guide
 --------------
 
-This part of the documentation begins with some background information about why Camelot was created, takes a small dip into the implementation details and then focuses on step-by-step instructions for getting the most out of Camelot.
+This part of the documentation begins with some background information about why Camelot was created, takes you through some implementation details, and then focuses on step-by-step instructions for getting the most out of Camelot.
 
 .. toctree::
    :maxdepth: 2
@@ -110,13 +112,13 @@ This part of the documentation begins with some background information about why
    user/how-it-works
    user/quickstart
    user/advanced
+   user/faq
    user/cli
 
 The API Documentation/Guide
 ---------------------------
 
-If you are looking for information on a specific function, class, or method,
-this part of the documentation is for you.
+If you are looking for information on a specific function, class, or method, this part of the documentation is for you.
 
 .. toctree::
    :maxdepth: 2
@@ -126,8 +128,7 @@ this part of the documentation is for you.
 The Contributor Guide
 ---------------------
 
-If you want to contribute to the project, this part of the documentation is for
-you.
+If you want to contribute to the project, this part of the documentation is for you.
 
 .. toctree::
    :maxdepth: 2

docs/user/advanced.rst

@@ -66,8 +66,7 @@ Let's plot all the text present on the table's PDF page.
 
 ::
 
-    >>> camelot.plot(tables[0], kind='text')
-    >>> plt.show()
+    >>> camelot.plot(tables[0], kind='text').show()
 
 .. tip::
     Here's how you can do the same with the :ref:`command-line interface <cli>`.
@@ -93,8 +92,7 @@ Let's plot the table (to see if it was detected correctly or not). This plot typ
 
 ::
 
-    >>> camelot.plot(tables[0], kind='grid')
-    >>> plt.show()
+    >>> camelot.plot(tables[0], kind='grid').show()
 
 .. tip::
     Here's how you can do the same with the :ref:`command-line interface <cli>`.
@@ -118,8 +116,7 @@ Now, let's plot all table boundaries present on the table's PDF page.
 
 ::
 
-    >>> camelot.plot(tables[0], kind='contour')
-    >>> plt.show()
+    >>> camelot.plot(tables[0], kind='contour').show()
 
 .. tip::
     Here's how you can do the same with the :ref:`command-line interface <cli>`.
@@ -141,8 +138,7 @@ Cool, let's plot all line segments present on the table's PDF page.
 
 ::
 
-    >>> camelot.plot(tables[0], kind='line')
-    >>> plt.show()
+    >>> camelot.plot(tables[0], kind='line').show()
 
 .. tip::
     Here's how you can do the same with the :ref:`command-line interface <cli>`.
@@ -164,8 +160,7 @@ Finally, let's plot all line intersections present on the table's PDF page.
 
 ::
 
-    >>> camelot.plot(tables[0], kind='joint')
-    >>> plt.show()
+    >>> camelot.plot(tables[0], kind='joint').show()
 
 .. tip::
     Here's how you can do the same with the :ref:`command-line interface <cli>`.
@@ -187,8 +182,7 @@ You can also visualize the textedges found on a page by specifying ``kind='texte
 
 ::
 
-    >>> camelot.plot(tables[0], kind='textedge')
-    >>> plt.show()
+    >>> camelot.plot(tables[0], kind='textedge').show()
 
 .. tip::
     Here's how you can do the same with the :ref:`command-line interface <cli>`.
@@ -375,8 +369,7 @@ Let's see the table area that is detected by default.
 ::
 
     >>> tables = camelot.read_pdf('edge_tol.pdf', flavor='stream')
-    >>> camelot.plot(tables[0], kind='contour')
-    >>> plt.show()
+    >>> camelot.plot(tables[0], kind='contour').show()
 
 .. tip::
     Here's how you can do the same with the :ref:`command-line interface <cli>`.
@@ -396,8 +389,7 @@ To improve the detected area, you can increase the ``edge_tol`` (default: 50) va
 ::
 
     >>> tables = camelot.read_pdf('edge_tol.pdf', flavor='stream', edge_tol=500)
-    >>> camelot.plot(tables[0], kind='contour')
-    >>> plt.show()
+    >>> camelot.plot(tables[0], kind='contour').show()
 
 .. tip::
     Here's how you can do the same with the :ref:`command-line interface <cli>`.
@@ -472,8 +464,7 @@ Let's plot the table for this PDF.
 ::
 
     >>> tables = camelot.read_pdf('short_lines.pdf')
-    >>> camelot.plot(tables[0], kind='grid')
-    >>> plt.show()
+    >>> camelot.plot(tables[0], kind='grid').show()
 
 .. figure:: ../_static/png/short_lines_1.png
     :alt: A plot of the PDF table with short lines
@@ -484,8 +475,7 @@ Clearly, the smaller lines separating the headers, couldn't be detected. Let's t
 ::
 
     >>> tables = camelot.read_pdf('short_lines.pdf', line_scale=40)
-    >>> camelot.plot(tables[0], kind='grid')
-    >>> plt.show()
+    >>> camelot.plot(tables[0], kind='grid').show()
 
 .. tip::
     Here's how you can do the same with the :ref:`command-line interface <cli>`.
@@ -628,8 +618,31 @@ Tweak layout generation
 
 Camelot is built on top of PDFMiner's functionality of grouping characters on a page into words and sentences. In some cases (such as `#170 <https://github.com/camelot-dev/camelot/issues/170>`_ and `#215 <https://github.com/camelot-dev/camelot/issues/215>`_), PDFMiner can group characters that should belong to the same sentence into separate sentences.
 
-To deal with such cases, you can tweak PDFMiner's `LAParams kwargs <https://github.com/euske/pdfminer/blob/master/pdfminer/layout.py#L33>`_ to improve layout generation, by passing the keyword arguments as a dict using ``layout_kwargs`` in :meth:`read_pdf() <camelot.read_pdf>`. To know more about the parameters you can tweak, you can check out `PDFMiner docs <https://euske.github.io/pdfminer/>`_.
+To deal with such cases, you can tweak PDFMiner's `LAParams kwargs <https://github.com/euske/pdfminer/blob/master/pdfminer/layout.py#L33>`_ to improve layout generation, by passing the keyword arguments as a dict using ``layout_kwargs`` in :meth:`read_pdf() <camelot.read_pdf>`. To know more about the parameters you can tweak, you can check out `PDFMiner docs <https://pdfminersix.rtfd.io/en/latest/reference/composable.html>`_.
 
 ::
 
     >>> tables = camelot.read_pdf('foo.pdf', layout_kwargs={'detect_vertical': False})
+
+.. _image-conversion-backend:
+
+Use alternate image conversion backends
+---------------------------------------
+
+When using the :ref:`Lattice <lattice>` flavor, Camelot uses ``ghostscript`` to convert PDF pages to images for line recognition. If you face installation issues with ``ghostscript``, you can use an alternate image conversion backend called ``poppler``. You can specify which image conversion backend you want to use with::
+
+    >>> tables = camelot.read_pdf(filename, backend="ghostscript")  # default
+    >>> tables = camelot.read_pdf(filename, backend="poppler")
+
+.. note:: ``ghostscript`` will be replaced by ``poppler`` as the default image conversion backend in ``v0.12.0``.
+
+If you face issues with both ``ghostscript`` and ``poppler``, you can supply your own image conversion backend::
+
+    >>> class ConversionBackend(object):
+    >>>     def convert(pdf_path, png_path):
+    >>>         # read pdf page from pdf_path
+    >>>         # convert pdf page to image
+    >>>         # write image to png_path
+    >>>         pass
+    >>>
+    >>> tables = camelot.read_pdf(filename, backend=ConversionBackend())

docs/user/faq.rst

@@ -0,0 +1,70 @@
+.. _faq:
+
+Frequently Asked Questions
+==========================
+
+This part of the documentation answers some common questions. To add questions, please open an issue `here <https://github.com/camelot-dev/camelot/issues/new>`_.
+
+Does Camelot work with image-based PDFs?
+----------------------------------------
+
+**No**, Camelot only works with text-based PDFs and not scanned documents. (As Tabula `explains <https://github.com/tabulapdf/tabula#why-tabula>`_, "If you can click and drag to select text in your table in a PDF viewer, then your PDF is text-based".)
+
+How to reduce memory usage for long PDFs?
+-----------------------------------------
+
+During table extraction from long PDF documents, RAM usage can grow significantly.
+
+A simple workaround is to divide the extraction into chunks, and save extracted data to disk at the end of every chunk.
+
+For more details, check out this code snippet from `@anakin87 <https://github.com/anakin87>`_:
+
+::
+
+    import camelot
+
+
+    def chunks(l, n):
+        """Yield successive n-sized chunks from l."""
+        for i in range(0, len(l), n):
+            yield l[i : i + n]
+
+
+    def extract_tables(filepath, pages, chunks=50, export_path=".", params={}):
+        """
+        Divide the extraction work into n chunks. At the end of every chunk,
+        save data on disk and free RAM.
+
+        filepath : str
+            Filepath or URL of the PDF file.
+        pages : str, optional (default: '1')
+            Comma-separated page numbers.
+            Example: '1,3,4' or '1,4-end' or 'all'.
+        """
+
+        # get list of pages from camelot.handlers.PDFHandler
+        handler = camelot.handlers.PDFHandler(filepath)
+        page_list = handler._get_pages(filepath, pages=pages)
+
+        # chunk pages list
+        page_chunks = list(chunks(page_list, chunks))
+
+        # extraction and export
+        for chunk in page_chunks:
+            pages_string = str(chunk).replace("[", "").replace("]", "")
+            tables = camelot.read_pdf(filepath, pages=pages_string, **params)
+            tables.export(f"{export_path}/tables.csv")
+
+How can I supply my own image conversion backend to Lattice?
+------------------------------------------------------------
+
+When using the :ref:`Lattice <lattice>` flavor, you can supply your own :ref:`image conversion backend <image-conversion-backend>` by creating a class with a ``convert`` method as follows::
+
+    >>> class ConversionBackend(object):
+    >>>     def convert(pdf_path, png_path):
+    >>>         # read pdf page from pdf_path
+    >>>         # convert pdf page to image
+    >>>         # write image to png_path
+    >>>         pass
+    >>>
+    >>> tables = camelot.read_pdf(filename, backend=ConversionBackend())

docs/user/how-it-works.rst

@@ -16,7 +16,7 @@ Stream can be used to parse tables that have whitespaces between cells to simula
 
 1. Words on the PDF page are grouped into text rows based on their *y* axis overlaps.
 
-2. Textedges are calculated and then used to guess interesting table areas on the PDF page. You can read `Anssi Nurminen's master's thesis <http://dspace.cc.tut.fi/dpub/bitstream/handle/123456789/21520/Nurminen.pdf?sequence=3>`_ to know more about this table detection technique. [See pages 20, 35 and 40]
+2. Textedges are calculated and then used to guess interesting table areas on the PDF page. You can read `Anssi Nurminen's master's thesis <https://pdfs.semanticscholar.org/a9b1/67a86fb189bfcd366c3839f33f0404db9c10.pdf>`_ to know more about this table detection technique. [See pages 20, 35 and 40]
 
 3. The number of columns inside each table area are then guessed. This is done by calculating the mode of number of words in each text row. Based on this mode, words in each text row are chosen to calculate a list of column *x* ranges.
 

docs/user/install-deps.rst

@@ -3,72 +3,60 @@
 Installation of dependencies
 ============================
 
-The dependencies `Tkinter`_ and `ghostscript`_ can be installed using your system's package manager. You can run one of the following, based on your OS.
-
-.. _Tkinter: https://wiki.python.org/moin/TkInter
-.. _ghostscript: https://www.ghostscript.com
+The dependencies `Ghostscript <https://www.ghostscript.com>`_ and `Tkinter <https://wiki.python.org/moin/TkInter>`_ can be installed using your system's package manager or by running their installer.
 
 OS-specific instructions
 ------------------------
 
-For Ubuntu
-^^^^^^^^^^
+Ubuntu
+^^^^^^
 ::
 
-    $ apt install python-tk ghostscript
+    $ apt install ghostscript python3-tk
 
-Or for Python 3::
-
-    $ apt install python3-tk ghostscript
-
-For macOS
-^^^^^^^^^
+MacOS
+^^^^^
 ::
 
-    $ brew install tcl-tk ghostscript
+    $ brew install ghostscript tcl-tk
 
-For Windows
-^^^^^^^^^^^
+Windows
+^^^^^^^
 
-For Tkinter, you can download the `ActiveTcl Community Edition`_ from ActiveState. For ghostscript, you can get the installer at the `ghostscript downloads page`_.
+For Ghostscript, you can get the installer at their `downloads page <https://www.ghostscript.com/download/gsdnld.html>`_. And for Tkinter, you can download the `ActiveTcl Community Edition <https://www.activestate.com/activetcl/downloads>`_ from ActiveState.
 
-.. _ActiveTcl Community Edition: https://www.activestate.com/activetcl/downloads
-.. _ghostscript downloads page: https://www.ghostscript.com/download/gsdnld.html
-.. _as shown here: https://java.com/en/download/help/path.xml
+Checks to see if dependencies are installed correctly
+-----------------------------------------------------
 
-Checks to see if dependencies were installed correctly
-------------------------------------------------------
+You can run the following checks to see if the dependencies were installed correctly.
 
-You can do the following checks to see if the dependencies were installed correctly.
+For Ghostscript
+^^^^^^^^^^^^^^^
+
+Open the Python REPL and run the following:
+
+For Ubuntu/MacOS::
+
+    >>> from ctypes.util import find_library
+    >>> find_library("gs")
+    "libgs.so.9"
+
+For Windows::
+
+    >>> import ctypes
+    >>> from ctypes.util import find_library
+    >>> find_library("".join(("gsdll", str(ctypes.sizeof(ctypes.c_voidp) * 8), ".dll")))
+    <name-of-ghostscript-library-on-windows>
+
+**Check:** The output of the ``find_library`` function should not be empty.
+
+If the output is empty, then it's possible that the Ghostscript library is not available one of the ``LD_LIBRARY_PATH``/``DYLD_LIBRARY_PATH``/``PATH`` variables depending on your operating system. In this case, you may have to modify one of those path variables.
 
 For Tkinter
 ^^^^^^^^^^^
 
-Launch Python, and then at the prompt, type::
-
-    >>> import Tkinter
-
-Or in Python 3::
+Launch Python and then import Tkinter::
 
     >>> import tkinter
 
-If you have Tkinter, Python will not print an error message, and if not, you will see an ``ImportError``.
-
-For ghostscript
-^^^^^^^^^^^^^^^
-
-Run the following to check the ghostscript version.
-
-For Ubuntu/macOS::
-
-    $ gs -version
-
-For Windows::
-
-    C:\> gswin64c.exe -version
-
-Or for Windows 32-bit::
-
-    C:\> gswin32c.exe -version
-
-If you have ghostscript, you should see the ghostscript version and copyright information.
+**Check:** Importing ``tkinter`` should not raise an import error.

docs/user/install.rst

@@ -5,43 +5,36 @@ Installation of Camelot
 
 This part of the documentation covers the steps to install Camelot.
 
-Using conda
------------
+After :ref:`installing the dependencies <install_deps>`, which include `Ghostscript <https://www.ghostscript.com>`_ and `Tkinter <https://wiki.python.org/moin/TkInter>`_, you can use one of the following methods to install Camelot:
 
-The easiest way to install Camelot is to install it with `conda`_, which is a package manager and environment management system for the `Anaconda`_ distribution.
-::
+.. warning:: The ``lattice`` flavor will fail to run if Ghostscript is not installed. You may run into errors as shown in `issue #193 <https://github.com/camelot-dev/camelot/issues/193>`_.
+
+pip
+---
+
+To install Camelot from PyPI using ``pip``, please include the extra ``cv`` requirement as shown::
+
+    $ pip install "camelot-py[base]"
+
+conda
+-----
+
+`conda`_ is a package manager and environment management system for the `Anaconda <https://anaconda.org>`_ distribution. It can be used to install Camelot from the ``conda-forge`` channel::
 
     $ conda install -c conda-forge camelot-py
 
-.. note:: Camelot is available for Python 2.7, 3.5, 3.6 and 3.7 on Linux, macOS and Windows. For Windows, you will need to install ghostscript which you can get from their `downloads page`_.
-
-.. _conda: https://conda.io/docs/
-.. _Anaconda: http://docs.continuum.io/anaconda/
-.. _downloads page: https://www.ghostscript.com/download/gsdnld.html
-.. _conda-forge: https://conda-forge.org/
-
-Using pip
----------
-
-After :ref:`installing the dependencies <install_deps>`, which include `Tkinter`_ and `ghostscript`_, you can simply use pip to install Camelot::
-
-    $ pip install "camelot-py[cv]"
-
-.. _Tkinter: https://wiki.python.org/moin/TkInter
-.. _ghostscript: https://www.ghostscript.com
-
 From the source code
 --------------------
 
-After :ref:`installing the dependencies <install_deps>`, you can install from the source by:
+After :ref:`installing the dependencies <install_deps>`, you can install Camelot from source by:
 
 1. Cloning the GitHub repository.
 ::
 
     $ git clone https://www.github.com/camelot-dev/camelot
 
-2. Then simply using pip again.
+2. And then simply using pip again.
 ::
 
     $ cd camelot
-    $ pip install ".[cv]"
+    $ pip install ".[base]"

docs/user/quickstart.rst

@@ -56,7 +56,7 @@ Woah! The accuracy is top-notch and there is less whitespace, which means the ta
 .. csv-table::
   :file: ../_static/csv/foo.csv
 
-Looks good! You can now export the table as a CSV file using its :meth:`to_csv() <camelot.core.Table.to_csv>` method. Alternatively you can use :meth:`to_json() <camelot.core.Table.to_json>`, :meth:`to_excel() <camelot.core.Table.to_excel>` :meth:`to_html() <camelot.core.Table.to_html>` or :meth:`to_sqlite() <camelot.core.Table.to_sqlite>` methods to export the table as JSON, Excel, HTML files or a sqlite database respectively.
+Looks good! You can now export the table as a CSV file using its :meth:`to_csv() <camelot.core.Table.to_csv>` method. Alternatively you can use :meth:`to_json() <camelot.core.Table.to_json>`, :meth:`to_excel() <camelot.core.Table.to_excel>` :meth:`to_html() <camelot.core.Table.to_html>` :meth:`to_markdown() <camelot.core.Table.to_markdown>` or :meth:`to_sqlite() <camelot.core.Table.to_sqlite>` methods to export the table as JSON, Excel, HTML files or a sqlite database respectively.
 
 ::
 
@@ -76,7 +76,7 @@ You can also export all tables at once, using the :class:`tables <camelot.core.T
 
         $ camelot --format csv --output foo.csv lattice foo.pdf
 
-This will export all tables as CSV files at the path specified. Alternatively, you can use ``f='json'``, ``f='excel'``, ``f='html'`` or ``f='sqlite'``.
+This will export all tables as CSV files at the path specified. Alternatively, you can use ``f='json'``, ``f='excel'``, ``f='html'``, ``f='markdown'`` or ``f='sqlite'``.
 
 .. note:: The :meth:`export() <camelot.core.TableList.export>` method exports files with a ``page-*-table-*`` suffix. In the example above, the single table in the list will be exported to ``foo-page-1-table-1.csv``. If the list contains multiple tables, multiple CSV files will be created. To avoid filling up your path with multiple files, you can use ``compress=True``, which will create a single ZIP file at your path with all the CSV files.
 

requirements.txt

@@ -1,10 +0,0 @@
-chardet>=3.0.4
-click>=6.7
-matplotlib>=2.2.3
-numpy>=1.13.3
-opencv-python>=3.4.2.17
-openpyxl>=2.5.8
-pandas>=0.23.4
-pdfminer.six>=20200720
-PyPDF2>=1.26.0
-Sphinx>=1.7.9

setup.py

@@ -6,75 +6,78 @@ from setuptools import find_packages
 
 here = os.path.abspath(os.path.dirname(__file__))
 about = {}
-with open(os.path.join(here, 'camelot', '__version__.py'), 'r') as f:
+with open(os.path.join(here, "camelot", "__version__.py"), "r") as f:
     exec(f.read(), about)
 
-with open('README.md', 'r') as f:
+with open("README.md", "r") as f:
     readme = f.read()
 
 
 requires = [
-    'chardet>=3.0.4',
-    'click>=6.7',
-    'numpy>=1.13.3',
-    'openpyxl>=2.5.8',
-    'pandas>=0.23.4',
-    'pdfminer.six>=20200720',
-    'PyPDF2>=1.26.0'
+    "chardet>=3.0.4",
+    "click>=6.7",
+    "numpy>=1.13.3",
+    "openpyxl>=2.5.8",
+    "pandas>=0.23.4",
+    "pdfminer.six>=20200726",
+    "PyPDF2>=1.26.0",
+    "tabulate>=0.8.9",
 ]
 
-cv_requires = [
-    'opencv-python>=3.4.2.17'
-]
+base_requires = ["ghostscript>=0.7", "opencv-python>=3.4.2.17", "pdftopng>=0.2.3"]
 
 plot_requires = [
-    'matplotlib>=2.2.3',
+    "matplotlib>=2.2.3",
 ]
 
 dev_requires = [
-    'codecov>=2.0.15',
-    'pytest>=3.8.0',
-    'pytest-cov>=2.6.0',
-    'pytest-mpl>=0.10',
-    'pytest-runner>=4.2',
-    'Sphinx>=1.7.9'
+    "codecov>=2.0.15",
+    "pytest>=5.4.3",
+    "pytest-cov>=2.10.0",
+    "pytest-mpl>=0.11",
+    "pytest-runner>=5.2",
+    "Sphinx>=3.1.2",
+    "sphinx-autobuild>=2021.3.14",
 ]
 
-all_requires = cv_requires + plot_requires
+all_requires = base_requires + plot_requires
 dev_requires = dev_requires + all_requires
 
 
 def setup_package():
-    metadata = dict(name=about['__title__'],
-                    version=about['__version__'],
-                    description=about['__description__'],
+    metadata = dict(
+        name=about["__title__"],
+        version=about["__version__"],
+        description=about["__description__"],
         long_description=readme,
         long_description_content_type="text/markdown",
-                    url=about['__url__'],
-                    author=about['__author__'],
-                    author_email=about['__author_email__'],
-                    license=about['__license__'],
-                    packages=find_packages(exclude=('tests',)),
+        url=about["__url__"],
+        author=about["__author__"],
+        author_email=about["__author_email__"],
+        license=about["__license__"],
+        packages=find_packages(exclude=("tests",)),
         install_requires=requires,
         extras_require={
-                        'all': all_requires,
-                        'cv': cv_requires,
-                        'dev': dev_requires,
-                        'plot': plot_requires
+            "all": all_requires,
+            "base": base_requires,
+            "cv": base_requires,  # deprecate
+            "dev": dev_requires,
+            "plot": plot_requires,
         },
         entry_points={
-                        'console_scripts': [
-                            'camelot = camelot.cli:cli',
+            "console_scripts": [
+                "camelot = camelot.cli:cli",
             ],
         },
         classifiers=[
             # Trove classifiers
             # Full list: https://pypi.python.org/pypi?%3Aaction=list_classifiers
-                        'License :: OSI Approved :: MIT License',
-                        'Programming Language :: Python :: 3.6',
-                        'Programming Language :: Python :: 3.7',
-                        'Programming Language :: Python :: 3.8'
-                    ])
+            "License :: OSI Approved :: MIT License",
+            "Programming Language :: Python :: 3.6",
+            "Programming Language :: Python :: 3.7",
+            "Programming Language :: Python :: 3.8",
+        ],
+    )
 
     try:
         from setuptools import setup
@@ -84,5 +87,5 @@ def setup_package():
     setup(**metadata)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     setup_package()

tests/data.py

@@ -2798,3 +2798,469 @@ data_stream_layout_kwargs = [
     ["A.O.P Cornas", ""],
     ["Domaine Lionnet « Terre Brûlée » 2012", "15 €"],
 ]
+
+data_stream_duplicated_text = [
+    [
+        "",
+        "2012 BETTER VARIETIES Harvest Report for Minnesota Central  [ MNCE ]",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "ALL SEASON TEST",
+    ],
+    [
+        "",
+        "Doug Toreen, Renville County, MN 55310          [ BIRD ISLAND ]",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "1.3 - 2.0 MAT. GROUP",
+    ],
+    [
+        "PREV. CROP/HERB:",
+        "Corn / Surpass, Roundup",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "S2MNCE01",
+    ],
+    [
+        "SOIL DESCRIPTION:",
+        "",
+        "Canisteo clay loam, mod. well drained, non-irrigated",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+    ],
+    [
+        "SOIL CONDITIONS:",
+        "",
+        "High P, high K, 6.7 pH, 3.9% OM, Low SCN",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        '30" ROW SPACING',
+    ],
+    [
+        "TILLAGE/CULTIVATION:",
+        "conventional w/ fall till",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+    ],
+    ["PEST MANAGEMENT:", "Roundup twice", "", "", "", "", "", "", "", "", ""],
+    [
+        "SEEDED - RATE:",
+        "May 15",
+        "140 000 /A",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "TOP 30 for YIELD of 63 TESTED",
+        "",
+    ],
+    [
+        "HARVESTED - STAND:",
+        "Oct 3",
+        "122 921 /A",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "",
+        "AVERAGE of (3) REPLICATIONS",
+        "",
+    ],
+    ["", "", "", "", "SCN", "Seed", "Yield", "Moisture", "Lodging", "Stand", "Gross"],
+    [
+        "Company/Brand",
+        "Product/Brand†",
+        "Technol.†",
+        "Mat.",
+        "Resist.",
+        "Trmt.†",
+        "Bu/A",
+        "%",
+        "%",
+        "(x 1000)",
+        "Income",
+    ],
+    [
+        "Kruger",
+        "K2 1901",
+        "RR2Y",
+        "1.9",
+        "R",
+        "Ac,PV",
+        "56.4",
+        "7.6",
+        "0",
+        "126.3",
+        "$846",
+    ],
+    [
+        "Stine",
+        "19RA02 §",
+        "RR2Y",
+        "1.9",
+        "R",
+        "CMB",
+        "55.3",
+        "7.6",
+        "0",
+        "120.0",
+        "$830",
+    ],
+    [
+        "Wensman",
+        "W 3190NR2",
+        "RR2Y",
+        "1.9",
+        "R",
+        "Ac",
+        "54.5",
+        "7.6",
+        "0",
+        "119.5",
+        "$818",
+    ],
+    ["Hefty", "H17Y12", "RR2Y", "1.7", "MR", "I", "53.7", "7.7", "0", "124.4", "$806"],
+    [
+        "Dyna-Gro",
+        "S15RY53",
+        "RR2Y",
+        "1.5",
+        "R",
+        "Ac",
+        "53.6",
+        "7.7",
+        "0",
+        "126.8",
+        "$804",
+    ],
+    [
+        "LG Seeds",
+        "C2050R2",
+        "RR2Y",
+        "2.1",
+        "R",
+        "Ac",
+        "53.6",
+        "7.7",
+        "0",
+        "123.9",
+        "$804",
+    ],
+    [
+        "Titan Pro",
+        "19M42",
+        "RR2Y",
+        "1.9",
+        "R",
+        "CMB",
+        "53.6",
+        "7.7",
+        "0",
+        "121.0",
+        "$804",
+    ],
+    [
+        "Stine",
+        "19RA02 (2) §",
+        "RR2Y",
+        "1.9",
+        "R",
+        "CMB",
+        "53.4",
+        "7.7",
+        "0",
+        "123.9",
+        "$801",
+    ],
+    [
+        "Asgrow",
+        "AG1832 §",
+        "RR2Y",
+        "1.8",
+        "MR",
+        "Ac,PV",
+        "52.9",
+        "7.7",
+        "0",
+        "122.0",
+        "$794",
+    ],
+    [
+        "Prairie Brand",
+        "PB-1566R2",
+        "RR2Y",
+        "1.5",
+        "R",
+        "CMB",
+        "52.8",
+        "7.7",
+        "0",
+        "122.9",
+        "$792",
+    ],
+    [
+        "Channel",
+        "1901R2",
+        "RR2Y",
+        "1.9",
+        "R",
+        "Ac,PV",
+        "52.8",
+        "7.6",
+        "0",
+        "123.4",
+        "$791",
+    ],
+    [
+        "Titan Pro",
+        "20M1",
+        "RR2Y",
+        "2.0",
+        "R",
+        "Am",
+        "52.5",
+        "7.5",
+        "0",
+        "124.4",
+        "$788",
+    ],
+    [
+        "Kruger",
+        "K2-2002",
+        "RR2Y",
+        "2.0",
+        "R",
+        "Ac,PV",
+        "52.4",
+        "7.9",
+        "0",
+        "125.4",
+        "$786",
+    ],
+    [
+        "Channel",
+        "1700R2",
+        "RR2Y",
+        "1.7",
+        "R",
+        "Ac,PV",
+        "52.3",
+        "7.9",
+        "0",
+        "123.9",
+        "$784",
+    ],
+    ["Hefty", "H16Y11", "RR2Y", "1.6", "MR", "I", "51.4", "7.6", "0", "123.9", "$771"],
+    [
+        "Anderson",
+        "162R2Y",
+        "RR2Y",
+        "1.6",
+        "R",
+        "None",
+        "51.3",
+        "7.5",
+        "0",
+        "119.5",
+        "$770",
+    ],
+    [
+        "Titan Pro",
+        "15M22",
+        "RR2Y",
+        "1.5",
+        "R",
+        "CMB",
+        "51.3",
+        "7.8",
+        "0",
+        "125.4",
+        "$769",
+    ],
+    [
+        "Dairyland",
+        "DSR-1710R2Y",
+        "RR2Y",
+        "1.7",
+        "R",
+        "CMB",
+        "51.3",
+        "7.7",
+        "0",
+        "122.0",
+        "$769",
+    ],
+    ["Hefty", "H20R3", "RR2Y", "2.0", "MR", "I", "50.5", "8.2", "0", "121.0", "$757"],
+    [
+        "Prairie Brand",
+        "PB 1743R2",
+        "RR2Y",
+        "1.7",
+        "R",
+        "CMB",
+        "50.2",
+        "7.7",
+        "0",
+        "125.8",
+        "$752",
+    ],
+    [
+        "Gold Country",
+        "1741",
+        "RR2Y",
+        "1.7",
+        "R",
+        "Ac",
+        "50.1",
+        "7.8",
+        "0",
+        "123.9",
+        "$751",
+    ],
+    [
+        "Trelay",
+        "20RR43",
+        "RR2Y",
+        "2.0",
+        "R",
+        "Ac,Ex",
+        "49.9",
+        "7.6",
+        "0",
+        "127.8",
+        "$749",
+    ],
+    ["Hefty", "H14R3", "RR2Y", "1.4", "MR", "I", "49.7", "7.7", "0", "122.9", "$746"],
+    [
+        "Prairie Brand",
+        "PB-2099NRR2",
+        "RR2Y",
+        "2.0",
+        "R",
+        "CMB",
+        "49.6",
+        "7.8",
+        "0",
+        "126.3",
+        "$743",
+    ],
+    [
+        "Wensman",
+        "W 3174NR2",
+        "RR2Y",
+        "1.7",
+        "R",
+        "Ac",
+        "49.3",
+        "7.6",
+        "0",
+        "122.5",
+        "$740",
+    ],
+    [
+        "Kruger",
+        "K2 1602",
+        "RR2Y",
+        "1.6",
+        "R",
+        "Ac,PV",
+        "48.7",
+        "7.6",
+        "0",
+        "125.4",
+        "$731",
+    ],
+    [
+        "NK Brand",
+        "S18-C2 §",
+        "RR2Y",
+        "1.8",
+        "R",
+        "CMB",
+        "48.7",
+        "7.7",
+        "0",
+        "126.8",
+        "$731",
+    ],
+    [
+        "Kruger",
+        "K2 1902",
+        "RR2Y",
+        "1.9",
+        "R",
+        "Ac,PV",
+        "48.7",
+        "7.5",
+        "0",
+        "124.4",
+        "$730",
+    ],
+    [
+        "Prairie Brand",
+        "PB-1823R2",
+        "RR2Y",
+        "1.8",
+        "R",
+        "None",
+        "48.5",
+        "7.6",
+        "0",
+        "121.0",
+        "$727",
+    ],
+    [
+        "Gold Country",
+        "1541",
+        "RR2Y",
+        "1.5",
+        "R",
+        "Ac",
+        "48.4",
+        "7.6",
+        "0",
+        "110.4",
+        "$726",
+    ],
+    ["", "", "", "", "", "Test Average  =", "47.6", "7.7", "0", "122.9", "$713"],
+    ["", "", "", "", "", "LSD (0.10)  =", "5.7", "0.3", "ns", "37.8", "566.4"],
+]

tests/test_cli.py

@@ -1,7 +1,9 @@
 # -*- coding: utf-8 -*-
 
 import os
+import sys
 
+import pytest
 from click.testing import CliRunner
 
 from camelot.cli import cli
@@ -11,6 +13,11 @@ from camelot.utils import TemporaryDirectory
 testdir = os.path.dirname(os.path.abspath(__file__))
 testdir = os.path.join(testdir, "files")
 
+skip_on_windows = pytest.mark.skipif(
+    sys.platform.startswith("win"),
+    reason="Ghostscript not installed in Windows test environment",
+)
+
 
 def test_help_output():
     runner = CliRunner()
@@ -26,6 +33,7 @@ def test_help_output():
     )
 
 
+@skip_on_windows
 def test_cli_lattice():
     with TemporaryDirectory() as tempdir:
         infile = os.path.join(testdir, "foo.pdf")
@@ -35,7 +43,7 @@ def test_cli_lattice():
             cli, ["--format", "csv", "--output", outfile, "lattice", infile]
         )
         assert result.exit_code == 0
-        assert result.output == "Found 1 tables\n"
+        assert "Found 1 tables" in result.output
 
         result = runner.invoke(cli, ["--format", "csv", "lattice", infile])
         output_error = "Error: Please specify output file path using --output"
@@ -123,7 +131,7 @@ def test_cli_output_format():
             cli,
             ["--format", "json", "--output", outfile, "stream", infile],
         )
-        assert result.exit_code == 0
+        assert result.exit_code == 0, f"Output: {result.output}"
 
         # excel
         outfile = os.path.join(tempdir, "health.xlsx")
@@ -131,7 +139,7 @@ def test_cli_output_format():
             cli,
             ["--format", "excel", "--output", outfile, "stream", infile],
         )
-        assert result.exit_code == 0
+        assert result.exit_code == 0, f"Output: {result.output}"
 
         # html
         outfile = os.path.join(tempdir, "health.html")
@@ -139,7 +147,15 @@ def test_cli_output_format():
             cli,
             ["--format", "html", "--output", outfile, "stream", infile],
         )
-        assert result.exit_code == 0
+        assert result.exit_code == 0, f"Output: {result.output}"
+
+        # markdown
+        outfile = os.path.join(tempdir, "health.md")
+        result = runner.invoke(
+            cli,
+            ["--format", "markdown", "--output", outfile, "stream", infile],
+        )
+        assert result.exit_code == 0, f"Output: {result.output}"
 
         # zip
         outfile = os.path.join(tempdir, "health.csv")
@@ -155,13 +171,13 @@ def test_cli_output_format():
                 infile,
             ],
         )
-        assert result.exit_code == 0
+        assert result.exit_code == 0, f"Output: {result.output}"
 
 
 def test_cli_quiet():
     with TemporaryDirectory() as tempdir:
-        infile = os.path.join(testdir, "blank.pdf")
-        outfile = os.path.join(tempdir, "blank.csv")
+        infile = os.path.join(testdir, "empty.pdf")
+        outfile = os.path.join(tempdir, "empty.csv")
         runner = CliRunner()
 
         result = runner.invoke(

tests/test_common.py

@@ -1,20 +1,45 @@
 # -*- coding: utf-8 -*-
 
 import os
+import sys
 
+import pytest
 import pandas as pd
 from pandas.testing import assert_frame_equal
 
 import camelot
+from camelot.io import PDFHandler
 from camelot.core import Table, TableList
 from camelot.__version__ import generate_version
+from camelot.backends import ImageConversionBackend
 
 from .data import *
 
 testdir = os.path.dirname(os.path.abspath(__file__))
 testdir = os.path.join(testdir, "files")
 
+skip_on_windows = pytest.mark.skipif(
+    sys.platform.startswith("win"),
+    reason="Ghostscript not installed in Windows test environment",
+)
 
+
+def test_version_generation():
+    version = (0, 7, 3)
+    assert generate_version(version, prerelease=None, revision=None) == "0.7.3"
+
+
+def test_version_generation_with_prerelease_revision():
+    version = (0, 7, 3)
+    prerelease = "alpha"
+    revision = 2
+    assert (
+        generate_version(version, prerelease=prerelease, revision=revision)
+        == "0.7.3-alpha.2"
+    )
+
+
+@skip_on_windows
 def test_parsing_report():
     parsing_report = {"accuracy": 99.02, "whitespace": 12.24, "order": 1, "page": 1}
 
@@ -34,246 +59,75 @@ def test_password():
     assert_frame_equal(df, tables[0].df)
 
 
-def test_stream():
-    df = pd.DataFrame(data_stream)
-
-    filename = os.path.join(testdir, "health.pdf")
-    tables = camelot.read_pdf(filename, flavor="stream")
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_stream_table_rotated():
-    df = pd.DataFrame(data_stream_table_rotated)
-
-    filename = os.path.join(testdir, "clockwise_table_2.pdf")
-    tables = camelot.read_pdf(filename, flavor="stream")
-    assert_frame_equal(df, tables[0].df)
-
-    filename = os.path.join(testdir, "anticlockwise_table_2.pdf")
-    tables = camelot.read_pdf(filename, flavor="stream")
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_stream_two_tables():
-    df1 = pd.DataFrame(data_stream_two_tables_1)
-    df2 = pd.DataFrame(data_stream_two_tables_2)
-
-    filename = os.path.join(testdir, "tabula/12s0324.pdf")
-    tables = camelot.read_pdf(filename, flavor="stream")
-
-    assert len(tables) == 2
-    assert df1.equals(tables[0].df)
-    assert df2.equals(tables[1].df)
-
-
-def test_stream_table_regions():
-    df = pd.DataFrame(data_stream_table_areas)
-
-    filename = os.path.join(testdir, "tabula/us-007.pdf")
-    tables = camelot.read_pdf(
-        filename, flavor="stream", table_regions=["320,460,573,335"]
-    )
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_stream_table_areas():
-    df = pd.DataFrame(data_stream_table_areas)
-
-    filename = os.path.join(testdir, "tabula/us-007.pdf")
-    tables = camelot.read_pdf(
-        filename, flavor="stream", table_areas=["320,500,573,335"]
-    )
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_stream_columns():
-    df = pd.DataFrame(data_stream_columns)
-
-    filename = os.path.join(testdir, "mexican_towns.pdf")
-    tables = camelot.read_pdf(
-        filename, flavor="stream", columns=["67,180,230,425,475"], row_tol=10
-    )
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_stream_split_text():
-    df = pd.DataFrame(data_stream_split_text)
-
-    filename = os.path.join(testdir, "tabula/m27.pdf")
-    tables = camelot.read_pdf(
-        filename,
-        flavor="stream",
-        columns=["72,95,209,327,442,529,566,606,683"],
-        split_text=True,
-    )
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_stream_flag_size():
-    df = pd.DataFrame(data_stream_flag_size)
-
-    filename = os.path.join(testdir, "superscript.pdf")
-    tables = camelot.read_pdf(filename, flavor="stream", flag_size=True)
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_stream_strip_text():
-    df = pd.DataFrame(data_stream_strip_text)
-
-    filename = os.path.join(testdir, "detect_vertical_false.pdf")
-    tables = camelot.read_pdf(filename, flavor="stream", strip_text=" ,\n")
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_stream_edge_tol():
-    df = pd.DataFrame(data_stream_edge_tol)
-
-    filename = os.path.join(testdir, "edge_tol.pdf")
-    tables = camelot.read_pdf(filename, flavor="stream", edge_tol=500)
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_stream_layout_kwargs():
-    df = pd.DataFrame(data_stream_layout_kwargs)
-
-    filename = os.path.join(testdir, "detect_vertical_false.pdf")
-    tables = camelot.read_pdf(
-        filename, flavor="stream", layout_kwargs={"detect_vertical": False}
-    )
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_lattice():
-    df = pd.DataFrame(data_lattice)
-
-    filename = os.path.join(
-        testdir, "tabula/icdar2013-dataset/competition-dataset-us/us-030.pdf"
-    )
-    tables = camelot.read_pdf(filename, pages="2")
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_lattice_table_rotated():
-    df = pd.DataFrame(data_lattice_table_rotated)
-
-    filename = os.path.join(testdir, "clockwise_table_1.pdf")
-    tables = camelot.read_pdf(filename)
-    assert_frame_equal(df, tables[0].df)
-
-    filename = os.path.join(testdir, "anticlockwise_table_1.pdf")
-    tables = camelot.read_pdf(filename)
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_lattice_two_tables():
-    df1 = pd.DataFrame(data_lattice_two_tables_1)
-    df2 = pd.DataFrame(data_lattice_two_tables_2)
-
-    filename = os.path.join(testdir, "twotables_2.pdf")
-    tables = camelot.read_pdf(filename)
-    assert len(tables) == 2
-    assert df1.equals(tables[0].df)
-    assert df2.equals(tables[1].df)
-
-
-def test_lattice_table_regions():
-    df = pd.DataFrame(data_lattice_table_regions)
-
-    filename = os.path.join(testdir, "table_region.pdf")
-    tables = camelot.read_pdf(filename, table_regions=["170,370,560,270"])
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_lattice_table_areas():
-    df = pd.DataFrame(data_lattice_table_areas)
-
-    filename = os.path.join(testdir, "twotables_2.pdf")
-    tables = camelot.read_pdf(filename, table_areas=["80,693,535,448"])
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_lattice_process_background():
-    df = pd.DataFrame(data_lattice_process_background)
-
-    filename = os.path.join(testdir, "background_lines_1.pdf")
-    tables = camelot.read_pdf(filename, process_background=True)
-    assert_frame_equal(df, tables[1].df)
-
-
-def test_lattice_copy_text():
-    df = pd.DataFrame(data_lattice_copy_text)
-
-    filename = os.path.join(testdir, "row_span_1.pdf")
-    tables = camelot.read_pdf(filename, line_scale=60, copy_text="v")
-    assert_frame_equal(df, tables[0].df)
-
-
-def test_lattice_shift_text():
-    df_lt = pd.DataFrame(data_lattice_shift_text_left_top)
-    df_disable = pd.DataFrame(data_lattice_shift_text_disable)
-    df_rb = pd.DataFrame(data_lattice_shift_text_right_bottom)
-
-    filename = os.path.join(testdir, "column_span_2.pdf")
-    tables = camelot.read_pdf(filename, line_scale=40)
-    assert df_lt.equals(tables[0].df)
-
-    tables = camelot.read_pdf(filename, line_scale=40, shift_text=[""])
-    assert df_disable.equals(tables[0].df)
-
-    tables = camelot.read_pdf(filename, line_scale=40, shift_text=["r", "b"])
-    assert df_rb.equals(tables[0].df)
-
-
-def test_repr():
+def test_repr_poppler():
     filename = os.path.join(testdir, "foo.pdf")
-    tables = camelot.read_pdf(filename)
+    tables = camelot.read_pdf(filename, backend="poppler")
     assert repr(tables) == "<TableList n=1>"
     assert repr(tables[0]) == "<Table shape=(7, 7)>"
-    assert (
-        repr(tables[0].cells[0][0]) == "<Cell x1=120.48 y1=218.43 x2=164.64 y2=233.77>"
-    )
+    assert repr(tables[0].cells[0][0]) == "<Cell x1=120 y1=219 x2=165 y2=234>"
 
 
-def test_pages():
+@skip_on_windows
+def test_repr_ghostscript():
+    filename = os.path.join(testdir, "foo.pdf")
+    tables = camelot.read_pdf(filename, backend="ghostscript")
+    assert repr(tables) == "<TableList n=1>"
+    assert repr(tables[0]) == "<Table shape=(7, 7)>"
+    assert repr(tables[0].cells[0][0]) == "<Cell x1=120 y1=218 x2=165 y2=234>"
+
+
+def test_url_poppler():
     url = "https://camelot-py.readthedocs.io/en/master/_static/pdf/foo.pdf"
-    tables = camelot.read_pdf(url)
+    tables = camelot.read_pdf(url, backend="poppler")
     assert repr(tables) == "<TableList n=1>"
     assert repr(tables[0]) == "<Table shape=(7, 7)>"
-    assert (
-        repr(tables[0].cells[0][0]) == "<Cell x1=120.48 y1=218.43 x2=164.64 y2=233.77>"
-    )
-
-    tables = camelot.read_pdf(url, pages="1-end")
-    assert repr(tables) == "<TableList n=1>"
-    assert repr(tables[0]) == "<Table shape=(7, 7)>"
-    assert (
-        repr(tables[0].cells[0][0]) == "<Cell x1=120.48 y1=218.43 x2=164.64 y2=233.77>"
-    )
-
-    tables = camelot.read_pdf(url, pages="all")
-    assert repr(tables) == "<TableList n=1>"
-    assert repr(tables[0]) == "<Table shape=(7, 7)>"
-    assert (
-        repr(tables[0].cells[0][0]) == "<Cell x1=120.48 y1=218.43 x2=164.64 y2=233.77>"
-    )
+    assert repr(tables[0].cells[0][0]) == "<Cell x1=120 y1=219 x2=165 y2=234>"
 
 
-def test_url():
+@skip_on_windows
+def test_url_ghostscript():
     url = "https://camelot-py.readthedocs.io/en/master/_static/pdf/foo.pdf"
-    tables = camelot.read_pdf(url)
+    tables = camelot.read_pdf(url, backend="ghostscript")
     assert repr(tables) == "<TableList n=1>"
     assert repr(tables[0]) == "<Table shape=(7, 7)>"
-    assert (
-        repr(tables[0].cells[0][0]) == "<Cell x1=120.48 y1=218.43 x2=164.64 y2=233.77>"
-    )
+    assert repr(tables[0].cells[0][0]) == "<Cell x1=120 y1=218 x2=165 y2=234>"
 
 
-def test_arabic():
-    df = pd.DataFrame(data_arabic)
+def test_pages_poppler():
+    url = "https://camelot-py.readthedocs.io/en/master/_static/pdf/foo.pdf"
+    tables = camelot.read_pdf(url, backend="poppler")
+    assert repr(tables) == "<TableList n=1>"
+    assert repr(tables[0]) == "<Table shape=(7, 7)>"
+    assert repr(tables[0].cells[0][0]) == "<Cell x1=120 y1=219 x2=165 y2=234>"
 
-    filename = os.path.join(testdir, "tabula/arabic.pdf")
-    tables = camelot.read_pdf(filename)
-    assert_frame_equal(df, tables[0].df)
+    tables = camelot.read_pdf(url, pages="1-end", backend="poppler")
+    assert repr(tables) == "<TableList n=1>"
+    assert repr(tables[0]) == "<Table shape=(7, 7)>"
+    assert repr(tables[0].cells[0][0]) == "<Cell x1=120 y1=219 x2=165 y2=234>"
+
+    tables = camelot.read_pdf(url, pages="all", backend="poppler")
+    assert repr(tables) == "<TableList n=1>"
+    assert repr(tables[0]) == "<Table shape=(7, 7)>"
+    assert repr(tables[0].cells[0][0]) == "<Cell x1=120 y1=219 x2=165 y2=234>"
+
+
+@skip_on_windows
+def test_pages_ghostscript():
+    url = "https://camelot-py.readthedocs.io/en/master/_static/pdf/foo.pdf"
+    tables = camelot.read_pdf(url, backend="ghostscript")
+    assert repr(tables) == "<TableList n=1>"
+    assert repr(tables[0]) == "<Table shape=(7, 7)>"
+    assert repr(tables[0].cells[0][0]) == "<Cell x1=120 y1=218 x2=165 y2=234>"
+
+    tables = camelot.read_pdf(url, pages="1-end", backend="ghostscript")
+    assert repr(tables) == "<TableList n=1>"
+    assert repr(tables[0]) == "<Table shape=(7, 7)>"
+    assert repr(tables[0].cells[0][0]) == "<Cell x1=120 y1=218 x2=165 y2=234>"
+
+    tables = camelot.read_pdf(url, pages="all", backend="ghostscript")
+    assert repr(tables) == "<TableList n=1>"
+    assert repr(tables[0]) == "<Table shape=(7, 7)>"
+    assert repr(tables[0].cells[0][0]) == "<Cell x1=120 y1=218 x2=165 y2=234>"
 
 
 def test_table_order():
@@ -301,16 +155,20 @@ def test_table_order():
     ]
 
 
-def test_version_generation():
-    version = (0, 7, 3)
-    assert generate_version(version, prerelease=None, revision=None) == "0.7.3"
+def test_handler_pages_generator():
+    filename = os.path.join(testdir, "foo.pdf")
 
+    handler = PDFHandler(filename)
+    assert handler._get_pages("1") == [1]
 
-def test_version_generation_with_prerelease_revision():
-    version = (0, 7, 3)
-    prerelease = "alpha"
-    revision = 2
-    assert (
-        generate_version(version, prerelease=prerelease, revision=revision)
-        == "0.7.3-alpha.2"
-    )
+    handler = PDFHandler(filename)
+    assert handler._get_pages("all") == [1]
+
+    handler = PDFHandler(filename)
+    assert handler._get_pages("1-end") == [1]
+
+    handler = PDFHandler(filename)
+    assert handler._get_pages("1,2,3,4") == [1, 2, 3, 4]
+
+    handler = PDFHandler(filename)
+    assert handler._get_pages("1,2,5-10") == [1, 2, 5, 6, 7, 8, 9, 10]

tests/test_errors.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 import os
+import sys
 import warnings
 
 import pytest
@@ -12,6 +13,11 @@ testdir = os.path.dirname(os.path.abspath(__file__))
 testdir = os.path.join(testdir, "files")
 filename = os.path.join(testdir, "foo.pdf")
 
+skip_on_windows = pytest.mark.skipif(
+    sys.platform.startswith("win"),
+    reason="Ghostscript not installed in Windows test environment",
+)
+
 
 def test_unknown_flavor():
     message = "Unknown flavor specified." " Use either 'lattice' or 'stream'"
@@ -32,38 +38,7 @@ def test_unsupported_format():
         tables = camelot.read_pdf(filename)
 
 
-def test_stream_equal_length():
-    message = "Length of table_areas and columns" " should be equal"
-    with pytest.raises(ValueError, match=message):
-        tables = camelot.read_pdf(
-            filename,
-            flavor="stream",
-            table_areas=["10,20,30,40"],
-            columns=["10,20,30,40", "10,20,30,40"],
-        )
-
-
-def test_image_warning():
-    filename = os.path.join(testdir, "image.pdf")
-    with warnings.catch_warnings():
-        warnings.simplefilter("error")
-        with pytest.raises(UserWarning) as e:
-            tables = camelot.read_pdf(filename)
-            assert (
-                str(e.value)
-                == "page-1 is image-based, camelot only works on text-based pages."
-            )
-
-
-def test_no_tables_found():
-    filename = os.path.join(testdir, "blank.pdf")
-    with warnings.catch_warnings():
-        warnings.simplefilter("error")
-        with pytest.raises(UserWarning) as e:
-            tables = camelot.read_pdf(filename)
-        assert str(e.value) == "No tables found on page-1"
-
-
+@skip_on_windows
 def test_no_tables_found_logs_suppressed():
     filename = os.path.join(testdir, "foo.pdf")
     with warnings.catch_warnings():
@@ -77,7 +52,7 @@ def test_no_tables_found_logs_suppressed():
 
 
 def test_no_tables_found_warnings_suppressed():
-    filename = os.path.join(testdir, "blank.pdf")
+    filename = os.path.join(testdir, "empty.pdf")
     with warnings.catch_warnings():
         # the test should fail if any warning is thrown
         warnings.simplefilter("error")
@@ -100,3 +75,81 @@ def test_bad_password():
     message = "file has not been decrypted"
     with pytest.raises(Exception, match=message):
         tables = camelot.read_pdf(filename, password="wrongpass")
+
+
+def test_stream_equal_length():
+    message = "Length of table_areas and columns" " should be equal"
+    with pytest.raises(ValueError, match=message):
+        tables = camelot.read_pdf(
+            filename,
+            flavor="stream",
+            table_areas=["10,20,30,40"],
+            columns=["10,20,30,40", "10,20,30,40"],
+        )
+
+
+def test_image_warning():
+    filename = os.path.join(testdir, "image.pdf")
+    with warnings.catch_warnings():
+        warnings.simplefilter("error", category=UserWarning)
+        with pytest.raises(UserWarning) as e:
+            tables = camelot.read_pdf(filename)
+            assert (
+                str(e.value)
+                == "page-1 is image-based, camelot only works on text-based pages."
+            )
+
+
+def test_stream_no_tables_on_page():
+    filename = os.path.join(testdir, "empty.pdf")
+    with warnings.catch_warnings():
+        warnings.simplefilter("error")
+        with pytest.raises(UserWarning) as e:
+            tables = camelot.read_pdf(filename, flavor="stream")
+        assert str(e.value) == "No tables found on page-1"
+
+
+def test_stream_no_tables_in_area():
+    filename = os.path.join(testdir, "only_page_number.pdf")
+    with warnings.catch_warnings():
+        warnings.simplefilter("error")
+        with pytest.raises(UserWarning) as e:
+            tables = camelot.read_pdf(filename, flavor="stream")
+        assert str(e.value) == "No tables found in table area 1"
+
+
+def test_lattice_no_tables_on_page():
+    filename = os.path.join(testdir, "empty.pdf")
+    with warnings.catch_warnings():
+        warnings.simplefilter("error", category=UserWarning)
+        with pytest.raises(UserWarning) as e:
+            tables = camelot.read_pdf(filename, flavor="lattice")
+        assert str(e.value) == "No tables found on page-1"
+
+
+def test_lattice_unknown_backend():
+    message = "Unknown backend 'mupdf' specified. Please use either 'poppler' or 'ghostscript'."
+    with pytest.raises(NotImplementedError, match=message):
+        tables = camelot.read_pdf(filename, backend="mupdf")
+
+
+def test_lattice_no_convert_method():
+    class ConversionBackend(object):
+        pass
+
+    message = "must implement a 'convert' method"
+    with pytest.raises(NotImplementedError, match=message):
+        tables = camelot.read_pdf(filename, backend=ConversionBackend())
+
+
+def test_lattice_ghostscript_deprecation_warning():
+    ghostscript_deprecation_warning = (
+        "'ghostscript' will be replaced by 'poppler' as the default image conversion"
+        " backend in v0.12.0. You can try out 'poppler' with backend='poppler'."
+    )
+
+    with warnings.catch_warnings():
+        warnings.simplefilter("error")
+        with pytest.raises(DeprecationWarning) as e:
+            tables = camelot.read_pdf(filename)
+            assert str(e.value) == ghostscript_deprecation_warning

tests/test_image_conversion_backend.py

@@ -0,0 +1,60 @@
+# -*- coding: utf-8 -*-
+
+import pytest
+
+import camelot.backends.image_conversion
+from camelot.backends import ImageConversionBackend
+
+
+class PopplerBackendError(object):
+    def convert(self, pdf_path, png_path):
+        raise ValueError("Image conversion failed")
+
+
+class GhostscriptBackendError(object):
+    def convert(self, pdf_path, png_path):
+        raise ValueError("Image conversion failed")
+
+
+class GhostscriptBackendNoError(object):
+    def convert(self, pdf_path, png_path):
+        pass
+
+
+def test_poppler_backend_error_when_no_use_fallback(monkeypatch):
+    BACKENDS = {
+        "poppler": PopplerBackendError,
+        "ghostscript": GhostscriptBackendNoError,
+    }
+    monkeypatch.setattr(
+        "camelot.backends.image_conversion.BACKENDS", BACKENDS, raising=True
+    )
+    backend = ImageConversionBackend(use_fallback=False)
+
+    message = "Image conversion failed with image conversion backend 'poppler'"
+    with pytest.raises(ValueError, match=message):
+        backend.convert("foo", "bar")
+
+
+def test_ghostscript_backend_when_use_fallback(monkeypatch):
+    BACKENDS = {
+        "poppler": PopplerBackendError,
+        "ghostscript": GhostscriptBackendNoError,
+    }
+    monkeypatch.setattr(
+        "camelot.backends.image_conversion.BACKENDS", BACKENDS, raising=True
+    )
+    backend = ImageConversionBackend()
+    backend.convert("foo", "bar")
+
+
+def test_ghostscript_backend_error_when_use_fallback(monkeypatch):
+    BACKENDS = {"poppler": PopplerBackendError, "ghostscript": GhostscriptBackendError}
+    monkeypatch.setattr(
+        "camelot.backends.image_conversion.BACKENDS", BACKENDS, raising=True
+    )
+    backend = ImageConversionBackend()
+
+    message = "Image conversion failed with image conversion backend 'ghostscript'"
+    with pytest.raises(ValueError, match=message):
+        backend.convert("foo", "bar")

tests/test_lattice.py

@@ -0,0 +1,120 @@
+# -*- coding: utf-8 -*-
+
+import os
+import sys
+
+import pytest
+import pandas as pd
+from pandas.testing import assert_frame_equal
+
+import camelot
+from camelot.core import Table, TableList
+from camelot.__version__ import generate_version
+
+from .data import *
+
+testdir = os.path.dirname(os.path.abspath(__file__))
+testdir = os.path.join(testdir, "files")
+
+skip_on_windows = pytest.mark.skipif(
+    sys.platform.startswith("win"),
+    reason="Ghostscript not installed in Windows test environment",
+)
+
+
+@skip_on_windows
+def test_lattice():
+    df = pd.DataFrame(data_lattice)
+
+    filename = os.path.join(
+        testdir, "tabula/icdar2013-dataset/competition-dataset-us/us-030.pdf"
+    )
+    tables = camelot.read_pdf(filename, pages="2")
+    assert_frame_equal(df, tables[0].df)
+
+
+@skip_on_windows
+def test_lattice_table_rotated():
+    df = pd.DataFrame(data_lattice_table_rotated)
+
+    filename = os.path.join(testdir, "clockwise_table_1.pdf")
+    tables = camelot.read_pdf(filename)
+    assert_frame_equal(df, tables[0].df)
+
+    filename = os.path.join(testdir, "anticlockwise_table_1.pdf")
+    tables = camelot.read_pdf(filename)
+    assert_frame_equal(df, tables[0].df)
+
+
+@skip_on_windows
+def test_lattice_two_tables():
+    df1 = pd.DataFrame(data_lattice_two_tables_1)
+    df2 = pd.DataFrame(data_lattice_two_tables_2)
+
+    filename = os.path.join(testdir, "twotables_2.pdf")
+    tables = camelot.read_pdf(filename)
+    assert len(tables) == 2
+    assert df1.equals(tables[0].df)
+    assert df2.equals(tables[1].df)
+
+
+@skip_on_windows
+def test_lattice_table_regions():
+    df = pd.DataFrame(data_lattice_table_regions)
+
+    filename = os.path.join(testdir, "table_region.pdf")
+    tables = camelot.read_pdf(filename, table_regions=["170,370,560,270"])
+    assert_frame_equal(df, tables[0].df)
+
+
+@skip_on_windows
+def test_lattice_table_areas():
+    df = pd.DataFrame(data_lattice_table_areas)
+
+    filename = os.path.join(testdir, "twotables_2.pdf")
+    tables = camelot.read_pdf(filename, table_areas=["80,693,535,448"])
+    assert_frame_equal(df, tables[0].df)
+
+
+@skip_on_windows
+def test_lattice_process_background():
+    df = pd.DataFrame(data_lattice_process_background)
+
+    filename = os.path.join(testdir, "background_lines_1.pdf")
+    tables = camelot.read_pdf(filename, process_background=True)
+    assert_frame_equal(df, tables[1].df)
+
+
+@skip_on_windows
+def test_lattice_copy_text():
+    df = pd.DataFrame(data_lattice_copy_text)
+
+    filename = os.path.join(testdir, "row_span_1.pdf")
+    tables = camelot.read_pdf(filename, line_scale=60, copy_text="v")
+    assert_frame_equal(df, tables[0].df)
+
+
+@skip_on_windows
+def test_lattice_shift_text():
+    df_lt = pd.DataFrame(data_lattice_shift_text_left_top)
+    df_disable = pd.DataFrame(data_lattice_shift_text_disable)
+    df_rb = pd.DataFrame(data_lattice_shift_text_right_bottom)
+
+    filename = os.path.join(testdir, "column_span_2.pdf")
+    tables = camelot.read_pdf(filename, line_scale=40)
+    assert df_lt.equals(tables[0].df)
+
+    tables = camelot.read_pdf(filename, line_scale=40, shift_text=[""])
+    assert df_disable.equals(tables[0].df)
+
+    tables = camelot.read_pdf(filename, line_scale=40, shift_text=["r", "b"])
+    assert df_rb.equals(tables[0].df)
+
+
+@skip_on_windows
+def test_lattice_arabic():
+    df = pd.DataFrame(data_arabic)
+
+    filename = os.path.join(testdir, "tabula/arabic.pdf")
+    tables = camelot.read_pdf(filename)
+    assert_frame_equal(df, tables[0].df)

tests/test_plotting.py

@@ -1,16 +1,22 @@
 # -*- coding: utf-8 -*-
 
 import os
+import sys
 
 import pytest
 
 import camelot
 
-
 testdir = os.path.dirname(os.path.abspath(__file__))
 testdir = os.path.join(testdir, "files")
 
+skip_on_windows = pytest.mark.skipif(
+    sys.platform.startswith("win"),
+    reason="Ghostscript not installed in Windows test environment",
+)
 
+
+@skip_on_windows
 @pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
 def test_text_plot():
     filename = os.path.join(testdir, "foo.pdf")
@@ -19,16 +25,24 @@ def test_text_plot():
 
 
 @pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
-def test_grid_plot():
-    filename = os.path.join(testdir, "foo.pdf")
-    tables = camelot.read_pdf(filename)
-    return camelot.plot(tables[0], kind="grid")
+def test_textedge_plot():
+    filename = os.path.join(testdir, "tabula/12s0324.pdf")
+    tables = camelot.read_pdf(filename, flavor="stream")
+    return camelot.plot(tables[0], kind="textedge")
 
 
 @pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
-def test_lattice_contour_plot():
+def test_lattice_contour_plot_poppler():
     filename = os.path.join(testdir, "foo.pdf")
-    tables = camelot.read_pdf(filename)
+    tables = camelot.read_pdf(filename, backend="poppler")
+    return camelot.plot(tables[0], kind="contour")
+
+
+@skip_on_windows
+@pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
+def test_lattice_contour_plot_ghostscript():
+    filename = os.path.join(testdir, "foo.pdf")
+    tables = camelot.read_pdf(filename, backend="ghostscript")
     return camelot.plot(tables[0], kind="contour")
 
 
@@ -40,21 +54,45 @@ def test_stream_contour_plot():
 
 
 @pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
-def test_line_plot():
+def test_line_plot_poppler():
     filename = os.path.join(testdir, "foo.pdf")
-    tables = camelot.read_pdf(filename)
+    tables = camelot.read_pdf(filename, backend="poppler")
+    return camelot.plot(tables[0], kind="line")
+
+
+@skip_on_windows
+@pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
+def test_line_plot_ghostscript():
+    filename = os.path.join(testdir, "foo.pdf")
+    tables = camelot.read_pdf(filename, backend="ghostscript")
     return camelot.plot(tables[0], kind="line")
 
 
 @pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
-def test_joint_plot():
+def test_joint_plot_poppler():
     filename = os.path.join(testdir, "foo.pdf")
-    tables = camelot.read_pdf(filename)
+    tables = camelot.read_pdf(filename, backend="poppler")
+    return camelot.plot(tables[0], kind="joint")
+
+
+@skip_on_windows
+@pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
+def test_joint_plot_ghostscript():
+    filename = os.path.join(testdir, "foo.pdf")
+    tables = camelot.read_pdf(filename, backend="ghostscript")
     return camelot.plot(tables[0], kind="joint")
 
 
 @pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
-def test_textedge_plot():
-    filename = os.path.join(testdir, "tabula/12s0324.pdf")
-    tables = camelot.read_pdf(filename, flavor="stream")
-    return camelot.plot(tables[0], kind="textedge")
+def test_grid_plot_poppler():
+    filename = os.path.join(testdir, "foo.pdf")
+    tables = camelot.read_pdf(filename, backend="poppler")
+    return camelot.plot(tables[0], kind="grid")
+
+
+@skip_on_windows
+@pytest.mark.mpl_image_compare(baseline_dir="files/baseline_plots", remove_text=True)
+def test_grid_plot_ghostscript():
+    filename = os.path.join(testdir, "foo.pdf")
+    tables = camelot.read_pdf(filename, backend="ghostscript")
+    return camelot.plot(tables[0], kind="grid")

tests/test_stream.py

@@ -0,0 +1,133 @@
+# -*- coding: utf-8 -*-
+
+import os
+
+import pytest
+import pandas as pd
+from pandas.testing import assert_frame_equal
+
+import camelot
+from camelot.core import Table, TableList
+from camelot.__version__ import generate_version
+
+from .data import *
+
+testdir = os.path.dirname(os.path.abspath(__file__))
+testdir = os.path.join(testdir, "files")
+
+
+def test_stream():
+    df = pd.DataFrame(data_stream)
+
+    filename = os.path.join(testdir, "health.pdf")
+    tables = camelot.read_pdf(filename, flavor="stream")
+    assert_frame_equal(df, tables[0].df)
+
+
+def test_stream_table_rotated():
+    df = pd.DataFrame(data_stream_table_rotated)
+
+    filename = os.path.join(testdir, "clockwise_table_2.pdf")
+    tables = camelot.read_pdf(filename, flavor="stream")
+    assert_frame_equal(df, tables[0].df)
+
+    filename = os.path.join(testdir, "anticlockwise_table_2.pdf")
+    tables = camelot.read_pdf(filename, flavor="stream")
+    assert_frame_equal(df, tables[0].df)
+
+
+def test_stream_two_tables():
+    df1 = pd.DataFrame(data_stream_two_tables_1)
+    df2 = pd.DataFrame(data_stream_two_tables_2)
+
+    filename = os.path.join(testdir, "tabula/12s0324.pdf")
+    tables = camelot.read_pdf(filename, flavor="stream")
+
+    assert len(tables) == 2
+    assert df1.equals(tables[0].df)
+    assert df2.equals(tables[1].df)
+
+
+def test_stream_table_regions():
+    df = pd.DataFrame(data_stream_table_areas)
+
+    filename = os.path.join(testdir, "tabula/us-007.pdf")
+    tables = camelot.read_pdf(
+        filename, flavor="stream", table_regions=["320,460,573,335"]
+    )
+    assert_frame_equal(df, tables[0].df)
+
+
+def test_stream_table_areas():
+    df = pd.DataFrame(data_stream_table_areas)
+
+    filename = os.path.join(testdir, "tabula/us-007.pdf")
+    tables = camelot.read_pdf(
+        filename, flavor="stream", table_areas=["320,500,573,335"]
+    )
+    assert_frame_equal(df, tables[0].df)
+
+
+def test_stream_columns():
+    df = pd.DataFrame(data_stream_columns)
+
+    filename = os.path.join(testdir, "mexican_towns.pdf")
+    tables = camelot.read_pdf(
+        filename, flavor="stream", columns=["67,180,230,425,475"], row_tol=10
+    )
+    assert_frame_equal(df, tables[0].df)
+
+
+def test_stream_split_text():
+    df = pd.DataFrame(data_stream_split_text)
+
+    filename = os.path.join(testdir, "tabula/m27.pdf")
+    tables = camelot.read_pdf(
+        filename,
+        flavor="stream",
+        columns=["72,95,209,327,442,529,566,606,683"],
+        split_text=True,
+    )
+    assert_frame_equal(df, tables[0].df)
+
+
+def test_stream_flag_size():
+    df = pd.DataFrame(data_stream_flag_size)
+
+    filename = os.path.join(testdir, "superscript.pdf")
+    tables = camelot.read_pdf(filename, flavor="stream", flag_size=True)
+    assert_frame_equal(df, tables[0].df)
+
+
+def test_stream_strip_text():
+    df = pd.DataFrame(data_stream_strip_text)
+
+    filename = os.path.join(testdir, "detect_vertical_false.pdf")
+    tables = camelot.read_pdf(filename, flavor="stream", strip_text=" ,\n")
+    assert_frame_equal(df, tables[0].df)
+
+
+def test_stream_edge_tol():
+    df = pd.DataFrame(data_stream_edge_tol)
+
+    filename = os.path.join(testdir, "edge_tol.pdf")
+    tables = camelot.read_pdf(filename, flavor="stream", edge_tol=500)
+    assert_frame_equal(df, tables[0].df)
+
+
+def test_stream_layout_kwargs():
+    df = pd.DataFrame(data_stream_layout_kwargs)
+
+    filename = os.path.join(testdir, "detect_vertical_false.pdf")
+    tables = camelot.read_pdf(
+        filename, flavor="stream", layout_kwargs={"detect_vertical": False}
+    )
+    assert_frame_equal(df, tables[0].df)
+
+
+def test_stream_duplicated_text():
+    df = pd.DataFrame(data_stream_duplicated_text)
+
+    filename = os.path.join(testdir, "birdisland.pdf")
+    tables = camelot.read_pdf(filename, flavor="stream")
+    assert_frame_equal(df, tables[0].df)