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/*

.github/ISSUE_TEMPLATE/bug_report.md

@@ -10,20 +10,25 @@ 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.
+
+<!-- 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 reproduce the behavior:
+<!-- Steps used to install `camelot`:
-1. Add step here (you can add more steps too)
+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.
+
+<!-- A clear and concise description of what you expected to happen. -->
 
 **Code**
-Add the Camelot code snippet that you used.
+
+<!-- Add the Camelot code snippet that you used. -->
+
 ```
 import camelot
 
@@ -31,13 +36,16 @@ import camelot
 ```
 
 **PDF**
-Add the PDF file that you want to extract tables from.
+
+<!-- Add the PDF file that you want to extract tables from. -->
 
 **Screenshots**
-If applicable, add screenshots to help explain your problem.
+
+<!-- If applicable, add screenshots to help explain your problem. -->
 
 **Environment**
- - OS: [e.g. MacOS]
+
+- OS: [e.g. macOS]
 - Python version:
 - Numpy version:
 - OpenCV version:
@@ -45,4 +53,5 @@ If applicable, add screenshots to help explain your problem.
 - Camelot version:
 
 **Additional context**
-Add any other context about the problem here.
+
+<!-- Add any other context about the problem here. -->

.github/workflows/tests.yml

@@ -7,7 +7,28 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        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

.gitignore

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

HISTORY.md

@@ -4,6 +4,23 @@ 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)
 ------------------
 

README.md

@@ -4,7 +4,7 @@
 
 # Camelot: PDF Table Extraction for Humans
 
-![Build Status](https://github.com/camelot-dev/camelot/actions/workflows/tests.yml/badge.svg) [![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)
@@ -22,7 +22,7 @@
 >>> tables = camelot.read_pdf('foo.pdf')
 >>> tables
 <TableList n=1>
->>> 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]
 <Table shape=(7, 7)>
 >>> tables[0].parsing_report
@@ -32,7 +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>
 
@@ -49,11 +49,13 @@ Camelot also comes packaged with a [command-line interface](https://camelot-py.r
 
 **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?
 
-- **Configurability**: Camelot gives you control over the table extraction process with its [tweakable settings](https://camelot-py.readthedocs.io/en/master/user/advanced.html).
+- **Configurability**: Camelot gives you control over the table extraction process with [tweakable settings](https://camelot-py.readthedocs.io/en/master/user/advanced.html).
-- **Metrics**: Bad tables can be discarded based on metrics like accuracy and whitespace, without having to manually look at each table.
+- **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 and Sqlite.
+- **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 similar libraries and tools](https://github.com/camelot-dev/camelot/wiki/Comparison-with-other-PDF-Table-Extraction-libraries-and-tools).
 
@@ -76,7 +78,7 @@ $ conda install -c conda-forge camelot-py
 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
@@ -91,7 +93,7 @@ and install Camelot using pip:
 
 <pre>
 $ cd camelot
-$ pip install ".[cv]"
+$ pip install ".[base]"
 </pre>
 
 ## Documentation

camelot/__version__.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-VERSION = (0, 9, 0)
+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

@@ -288,10 +288,10 @@ class Cell(object):
         self._text = ""
 
     def __repr__(self):
-        x1 = round(self.x1, 2)
+        x1 = round(self.x1)
-        y1 = round(self.y1, 2)
+        y1 = round(self.y1)
-        x2 = round(self.x2, 2)
+        x2 = round(self.x2)
-        y2 = round(self.y2, 2)
+        y2 = round(self.y2)
         return f"<Cell x1={x1} y1={y1} x2={x2} y2={y2}>"
 
     @property
@@ -630,6 +630,21 @@ class Table(object):
         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.
 
@@ -711,7 +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.
 
@@ -724,7 +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
-
- Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-                            Preamble
-
-  The GNU General Public License is a free, copyleft license for
-software and other kinds of works.
-
-  The licenses for most software and other practical works are designed
-to take away your freedom to share and change the works.  By contrast,
-the GNU General Public License is intended to guarantee your freedom to
-share and change all versions of a program--to make sure it remains free
-software for all its users.  We, the Free Software Foundation, use the
-GNU General Public License for most of our software; it applies also to
-any other work released this way by its authors.  You can apply it to
-your programs, too.
-
-  When we speak of free software, we are referring to freedom, not
-price.  Our General Public Licenses are designed to make sure that you
-have the freedom to distribute copies of free software (and charge for
-them if you wish), that you receive source code or can get it if you
-want it, that you can change the software or use pieces of it in new
-free programs, and that you know you can do these things.
-
-  To protect your rights, we need to prevent others from denying you
-these rights or asking you to surrender the rights.  Therefore, you have
-certain responsibilities if you distribute copies of the software, or if
-you modify it: responsibilities to respect the freedom of others.
-
-  For example, if you distribute copies of such a program, whether
-gratis or for a fee, you must pass on to the recipients the same
-freedoms that you received.  You must make sure that they, too, receive
-or can get the source code.  And you must show them these terms so they
-know their rights.
-
-  Developers that use the GNU GPL protect your rights with two steps:
-(1) assert copyright on the software, and (2) offer you this License
-giving you legal permission to copy, distribute and/or modify it.
-
-  For the developers' and authors' protection, the GPL clearly explains
-that there is no warranty for this free software.  For both users' and
-authors' sake, the GPL requires that modified versions be marked as
-changed, so that their problems will not be attributed erroneously to
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camelot/ext/ghostscript/__init__.py

@@ -1,98 +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"):
+        # if not filepath.lower().endswith(".pdf"):
-            raise NotImplementedError("File format not supported")
+        #     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
@@ -67,13 +67,16 @@ class PDFHandler(object):
 
         """
         page_numbers = []
+
         if pages == "1":
             page_numbers.append({"start": 1, "end": 1})
         else:
-            instream = open(filepath, "rb")
+            with open(self.filepath, "rb") as f:
-            infile = PdfFileReader(instream, strict=False)
+                infile = PdfFileReader(f, strict=False)
+
                 if infile.isEncrypted:
                     infile.decrypt(self.password)
+
                 if pages == "all":
                     page_numbers.append({"start": 1, "end": infile.getNumPages()})
                 else:
@@ -85,7 +88,7 @@ class PDFHandler(object):
                             page_numbers.append({"start": int(a), "end": int(b)})
                         else:
                             page_numbers.append({"start": int(r), "end": int(r)})
-            instream.close()
+
         P = []
         for p in page_numbers:
             P.extend(range(p["start"], p["end"] + 1))

camelot/parsers/base.py

@@ -17,3 +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 {} -r{} {}".format(
-            self.imagename, self.resolution, 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 = []

docs/index.rst

@@ -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
@@ -64,7 +64,7 @@ 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::
@@ -74,14 +74,16 @@ 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?
 ------------
 
-- **Configurability**: Camelot gives you control over the table extraction process with its :ref:`tweakable settings <advanced>`.
+- **Configurability**: Camelot gives you control over the table extraction process with :ref:`tweakable settings <advanced>`.
-- **Metrics**: Bad tables can be discarded based on metrics like accuracy and whitespace, without having to manually look at each table.
+- **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 and Sqlite.
+- **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
 
@@ -110,6 +112,7 @@ 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

docs/user/advanced.rst

@@ -623,3 +623,26 @@ To deal with such cases, you can tweak PDFMiner's `LAParams kwargs <https://gith
 ::
 
     >>> 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/install-deps.rst

@@ -43,8 +43,9 @@ For Ubuntu/MacOS::
 
 For Windows::
 
+    >>> import ctypes
     >>> from ctypes.util import find_library
-    >>> find_library("".join(("gsdll", str(ctypes.sizeof(ctypes.c_voidp) * 8), ".dll"))
+    >>> 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.

docs/user/install.rst

@@ -14,7 +14,7 @@ pip
 
 To install Camelot from PyPI using ``pip``, please include the extra ``cv`` requirement as shown::
 
-    $ pip install "camelot-py[cv]"
+    $ pip install "camelot-py[base]"
 
 conda
 -----
@@ -37,4 +37,4 @@ After :ref:`installing the dependencies <install_deps>`, you can install Camelot
 ::
 
     $ 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.
 

setup.py

@@ -21,9 +21,10 @@ requires = [
     "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",
@@ -36,9 +37,10 @@ dev_requires = [
     "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
 
 
@@ -57,7 +59,8 @@ def setup_package():
         install_requires=requires,
         extras_require={
             "all": all_requires,
-            "cv": cv_requires,
+            "base": base_requires,
+            "cv": base_requires,  # deprecate
             "dev": dev_requires,
             "plot": plot_requires,
         },
@@ -73,7 +76,6 @@ def setup_package():
             "Programming Language :: Python :: 3.6",
             "Programming Language :: Python :: 3.7",
             "Programming Language :: Python :: 3.8",
-            "Programming Language :: Python :: 3.9",
         ],
     )
 

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")
@@ -155,7 +171,7 @@ def test_cli_output_format():
                 infile,
             ],
         )
-        assert result.exit_code == 0
+        assert result.exit_code == 0, f"Output: {result.output}"
 
 
 def test_cli_quiet():

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():
+def test_repr_poppler():
-    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():
     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 (
+    assert repr(tables[0].cells[0][0]) == "<Cell x1=120 y1=219 x2=165 y2=234>"
-        repr(tables[0].cells[0][0]) == "<Cell x1=120.48 y1=218.43 x2=164.64 y2=233.77>"
-    )
 
 
-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 (
+    assert repr(tables[0].cells[0][0]) == "<Cell x1=120 y1=219 x2=165 y2=234>"
-        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>"
-    )
 
 
-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 (
+    assert repr(tables[0].cells[0][0]) == "<Cell x1=120 y1=218 x2=165 y2=234>"
-        repr(tables[0].cells[0][0]) == "<Cell x1=120.48 y1=218.43 x2=164.64 y2=233.77>"
-    )
 
 
-def test_arabic():
+def test_pages_poppler():
-    df = pd.DataFrame(data_arabic)
+    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(url, pages="1-end", backend="poppler")
-    tables = camelot.read_pdf(filename)
+    assert repr(tables) == "<TableList n=1>"
-    assert_frame_equal(df, tables[0].df)
+    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():
@@ -301,24 +155,20 @@ def test_table_order():
     ]
 
 
-def test_version_generation():
+def test_handler_pages_generator():
-    version = (0, 7, 3)
+    filename = os.path.join(testdir, "foo.pdf")
-    assert generate_version(version, prerelease=None, revision=None) == "0.7.3"
 
+    handler = PDFHandler(filename)
+    assert handler._get_pages("1") == [1]
 
-def test_version_generation_with_prerelease_revision():
+    handler = PDFHandler(filename)
-    version = (0, 7, 3)
+    assert handler._get_pages("all") == [1]
-    prerelease = "alpha"
-    revision = 2
-    assert (
-        generate_version(version, prerelease=prerelease, revision=revision)
-        == "0.7.3-alpha.2"
-    )
 
+    handler = PDFHandler(filename)
+    assert handler._get_pages("1-end") == [1]
 
-def test_stream_duplicated_text():
+    handler = PDFHandler(filename)
-    df = pd.DataFrame(data_stream_duplicated_text)
+    assert handler._get_pages("1,2,3,4") == [1, 2, 3, 4]
 
-    filename = os.path.join(testdir, "birdisland.pdf")
+    handler = PDFHandler(filename)
-    tables = camelot.read_pdf(filename, flavor="stream")
+    assert handler._get_pages("1,2,5-10") == [1, 2, 5, 6, 7, 8, 9, 10]
-    assert_frame_equal(df, tables[0].df)

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'"
@@ -32,56 +38,7 @@ def test_unsupported_format():
         tables = camelot.read_pdf(filename)
 
 
-def test_stream_equal_length():
+@skip_on_windows
-    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_lattice_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="lattice")
-        assert str(e.value) == "No tables found on page-1"
-
-
-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_no_tables_found_logs_suppressed():
     filename = os.path.join(testdir, "foo.pdf")
     with warnings.catch_warnings():
@@ -118,3 +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():
+def test_textedge_plot():
-    filename = os.path.join(testdir, "foo.pdf")
+    filename = os.path.join(testdir, "tabula/12s0324.pdf")
-    tables = camelot.read_pdf(filename)
+    tables = camelot.read_pdf(filename, flavor="stream")
-    return camelot.plot(tables[0], kind="grid")
+    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():
+def test_grid_plot_poppler():
-    filename = os.path.join(testdir, "tabula/12s0324.pdf")
+    filename = os.path.join(testdir, "foo.pdf")
-    tables = camelot.read_pdf(filename, flavor="stream")
+    tables = camelot.read_pdf(filename, backend="poppler")
-    return camelot.plot(tables[0], kind="textedge")
+    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)