Move Pdf class to core as FileHandler
Vinayak Mehta
parent
0c9e21d881
commit
5d29f0c21c
220
camelot/core.py
220
camelot/core.py
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@ -1,69 +1,14 @@
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import os
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import tempfile
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import numpy as np
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import pandas as pd
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from PyPDF2 import PdfFileReader, PdfFileWriter
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from .utils import get_page_layout, get_text_objects, get_rotation
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class Cell(object):
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"""Cell.
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Defines a cell object with coordinates relative to a left-bottom
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origin, which is also PDFMiner's coordinate space.
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Parameters
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----------
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x1 : float
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x-coordinate of left-bottom point.
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y1 : float
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y-coordinate of left-bottom point.
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x2 : float
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x-coordinate of right-top point.
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y2 : float
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y-coordinate of right-top point.
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Attributes
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----------
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lb : tuple
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Tuple representing left-bottom coordinates.
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lt : tuple
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Tuple representing left-top coordinates.
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rb : tuple
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Tuple representing right-bottom coordinates.
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rt : tuple
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Tuple representing right-top coordinates.
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bbox : tuple
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Tuple representing the cell's bounding box using the
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lower-bottom and right-top coordinates.
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left : bool
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Whether or not cell is bounded on the left.
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right : bool
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Whether or not cell is bounded on the right.
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top : bool
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Whether or not cell is bounded on the top.
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bottom : bool
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Whether or not cell is bounded on the bottom.
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text_objects : list
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List of text objects assigned to cell.
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text : string
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Text assigned to cell.
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spanning_h : bool
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Whether or not cell spans/extends horizontally.
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spanning_v : bool
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Whether or not cell spans/extends vertically.
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"""
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def __init__(self, x1, y1, x2, y2):
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self.x1 = x1
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@ -86,76 +31,23 @@ class Cell(object):
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self.image = None
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def add_text(self, text):
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"""Adds text to cell.
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Parameters
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----------
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text : string
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"""
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self.text = ''.join([self.text, text])
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def get_text(self):
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"""Returns text assigned to cell.
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Returns
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-------
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text : string
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"""
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return self.text
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def add_object(self, t_object):
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"""Adds PDFMiner text object to cell.
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Parameters
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----------
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t_object : object
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"""
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self.text_objects.append(t_object)
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def get_objects(self):
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"""Returns list of text objects assigned to cell.
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Returns
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-------
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text_objects : list
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"""
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return self.text_objects
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def get_bounded_edges(self):
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"""Returns the number of edges by which a cell is bounded.
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Returns
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-------
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bounded_edges : int
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"""
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self.bounded_edges = self.top + self.bottom + self.left + self.right
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return self.bounded_edges
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class Table(object):
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"""Table.
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Defines a table object with coordinates relative to a left-bottom
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origin, which is also PDFMiner's coordinate space.
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Parameters
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----------
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cols : list
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List of tuples representing column x-coordinates in increasing
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order.
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rows : list
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List of tuples representing row y-coordinates in decreasing
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order.
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Attributes
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----------
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cells : list
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List of cell objects with row-major ordering.
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nocont_ : int
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Number of lines that did not contribute to setting cell edges.
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"""
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def __init__(self, cols, rows):
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self.cols = cols
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@ -166,8 +58,6 @@ class Table(object):
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self.image = None
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def set_all_edges(self):
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"""Sets all table edges to True.
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"""
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for r in range(len(self.rows)):
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for c in range(len(self.cols)):
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self.cells[r][c].left = True
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@ -177,8 +67,6 @@ class Table(object):
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return self
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def set_border_edges(self):
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"""Sets table border edges to True.
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"""
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for r in range(len(self.rows)):
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self.cells[r][0].left = True
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self.cells[r][len(self.cols) - 1].right = True
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@ -188,19 +76,6 @@ class Table(object):
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return self
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def set_edges(self, vertical, horizontal, jtol=2):
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"""Sets a cell's edges to True depending on whether they
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overlap with lines found by imgproc.
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Parameters
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----------
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vertical : list
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List of vertical lines detected by imgproc. Coordinates
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scaled and translated to the PDFMiner's coordinate space.
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horizontal : list
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List of horizontal lines detected by imgproc. Coordinates
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scaled and translated to the PDFMiner's coordinate space.
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"""
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for v in vertical:
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# find closest x coord
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# iterate over y coords and find closest points
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@ -308,10 +183,6 @@ class Table(object):
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return self
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def set_spanning(self):
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"""Sets a cell's spanning_h or spanning_v attribute to True
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depending on whether the cell spans/extends horizontally or
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vertically.
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"""
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for r in range(len(self.rows)):
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for c in range(len(self.cols)):
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bound = self.cells[r][c].get_bounded_edges()
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@ -351,13 +222,6 @@ class Table(object):
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return self
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def get_list(self):
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"""Returns a two-dimensional list of text assigned to each
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cell.
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Returns
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-------
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ar : list
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"""
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ar = []
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for r in range(len(self.rows)):
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ar.append([self.cells[r][c].get_text().strip()
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@ -367,3 +231,75 @@ class Table(object):
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class TableSet(object):
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pass
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class FileHandler(object):
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def __init__(self, filename, pages='1'):
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self.filename = filename
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if not self.filename.endswith('.pdf'):
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raise TypeError("File format not supported.")
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self.pages = __get_pages(pages)
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self.temp = tempfile.mkdtemp()
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@staticmethod
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def __get_pages(filename, pages):
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p = {}
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if pages == '1':
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p.append({'start': 1, 'end': 1})
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else:
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infile = PdfFileReader(open(filename, 'rb'), strict=False)
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if pages == 'all':
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p.append({'start': 1, 'end': infile.getNumPages()})
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else:
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for r in pages.split(','):
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if '-' in r:
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a, b = r.split('-')
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if b == 'end':
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b = infile.getNumPages()
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p.append({'start': int(a), 'end': int(b)})
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else:
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p.append({'start': int(r), 'end': int(r)})
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return p
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@staticmethod
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def __save_page(filename, page, temp):
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with open(filename, 'rb') as fileobj:
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infile = PdfFileReader(fileobj, strict=False)
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fpath = os.path.join(temp, 'page-{0}.pdf'.format(page))
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fname, fext = os.path.splitext(fpath)
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p = infile.getPage(page - 1)
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outfile = PdfFileWriter()
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outfile.addPage(p)
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with open(fpath, 'wb') as f:
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outfile.write(f)
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layout, dim = get_page_layout(fpath)
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# fix rotated pdf
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lttextlh = get_text_objects(layout, ltype="lh")
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lttextlv = get_text_objects(layout, ltype="lv")
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ltchar = get_text_objects(layout, ltype="char")
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rotation = get_rotation(lttextlh, lttextlv, ltchar)
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if rotation != '':
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fpath_new = ''.join([fname.replace('page', 'p'), '_rotated', fext])
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os.rename(fpath, fpath_new)
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infile = PdfFileReader(open(fpath_new, 'rb'), strict=False)
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outfile = PdfFileWriter()
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p = infile.getPage(0)
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if rotation == 'left':
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p.rotateClockwise(90)
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elif rotation == 'right':
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p.rotateCounterClockwise(90)
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outfile.addPage(p)
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with open(fpath, 'wb') as f:
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outfile.write(f)
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def parse(self):
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for p in self.pages:
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__save_page(self.filename, p, self.temp)
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pages = [os.path.join(self.temp, 'page-{0}.pdf'.format(p))
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for p in self.pagenos]
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tables = {}
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for p in pages:
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table = self.parser.get_tables(p)
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if table is not None:
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tables.update(table)
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return tables
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268
camelot/pdf.py
268
camelot/pdf.py
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@ -1,268 +0,0 @@
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import os
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import shutil
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import tempfile
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import itertools
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import multiprocessing as mp
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from functools import partial
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import cv2
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from PyPDF2 import PdfFileReader, PdfFileWriter
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from .utils import get_page_layout, get_text_objects, get_rotation
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__all__ = ['Pdf']
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def _parse_page_numbers(pagenos):
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"""Converts list of dicts to list of ints.
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Parameters
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----------
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pagenos : list
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List of dicts representing page ranges. A dict must have only
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two keys named 'start' and 'end' having int as their value.
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Returns
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-------
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page_numbers : list
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List of int page numbers.
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"""
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page_numbers = []
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for p in pagenos:
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page_numbers.extend(range(p['start'], p['end'] + 1))
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page_numbers = sorted(set(page_numbers))
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return page_numbers
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def _save_page(temp, pdfname, pageno):
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with open(pdfname, 'rb') as pdffile:
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infile = PdfFileReader(pdffile, strict=False)
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sp_path = os.path.join(temp, 'page-{0}.pdf'.format(pageno))
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sp_name, sp_ext = os.path.splitext(sp_path)
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page = infile.getPage(pageno - 1)
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outfile = PdfFileWriter()
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outfile.addPage(page)
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with open(sp_path, 'wb') as f:
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outfile.write(f)
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layout, dim = get_page_layout(sp_path)
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lttextlh = get_text_objects(layout, ltype="lh")
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lttextlv = get_text_objects(layout, ltype="lv")
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ltchar = get_text_objects(layout, ltype="char")
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rotation = get_rotation(lttextlh, lttextlv, ltchar)
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if rotation != '':
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sp_new_path = ''.join([sp_name.replace('page', 'p'), '_rotated', sp_ext])
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os.rename(sp_path, sp_new_path)
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sp_in = PdfFileReader(open(sp_new_path, 'rb'),
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strict=False)
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sp_out = PdfFileWriter()
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sp_page = sp_in.getPage(0)
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if rotation == 'left':
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sp_page.rotateClockwise(90)
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elif rotation == 'right':
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sp_page.rotateCounterClockwise(90)
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sp_out.addPage(sp_page)
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with open(sp_path, 'wb') as pdf_out:
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sp_out.write(pdf_out)
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class Pdf:
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"""Pdf manager.
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Handles all operations like temp directory creation, splitting file
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into single page pdfs, running extraction using multiple processes
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and removing the temp directory.
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Parameters
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----------
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extractor : object
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camelot.stream.Stream or camelot.lattice.Lattice extractor
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object.
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pdfname : string
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Path to pdf file.
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pagenos : list
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List of dicts representing page ranges. A dict must have only
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two keys named 'start' and 'end' having int as their value.
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(optional, default: [{'start': 1, 'end': 1}])
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parallel : bool
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Whether or not to run using multiple processes.
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(optional, default: False)
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clean : bool
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Whether or not to remove the temp directory.
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(optional, default: False)
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"""
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def __init__(self, extractor, pdfname, pagenos=[{'start': 1, 'end': 1}],
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parallel=False, clean=False):
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self.extractor = extractor
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self.pdfname = pdfname
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if not self.pdfname.endswith('.pdf'):
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raise TypeError("File format not supported.")
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self.pagenos = _parse_page_numbers(pagenos)
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self.parallel = parallel
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if self.parallel:
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self.cpu_count = mp.cpu_count()
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self.pool = mp.Pool(processes=self.cpu_count)
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self.clean = clean
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self.temp = tempfile.mkdtemp()
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def split(self):
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"""Splits file into single page pdfs.
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"""
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if self.parallel:
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pfunc = partial(_save_page, self.temp, self.pdfname)
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self.pool.map(pfunc, self.pagenos)
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else:
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for p in self.pagenos:
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_save_page(self.temp, self.pdfname, p)
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def extract(self):
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"""Runs table extraction by calling extractor.get_tables
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on all single page pdfs.
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"""
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self.split()
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pages = [os.path.join(self.temp, 'page-{0}.pdf'.format(p))
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for p in self.pagenos]
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if self.parallel:
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tables = self.pool.map(self.extractor.get_tables, pages)
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tables = {k: v for d in tables if d is not None for k, v in d.items()}
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else:
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tables = {}
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if self.extractor.debug:
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if self.extractor.method == 'stream':
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self.debug = self.extractor.debug
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self.debug_text = []
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elif self.extractor.method in ['lattice', 'ocrl']:
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self.debug = self.extractor.debug
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self.debug_images = []
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self.debug_segments = []
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self.debug_tables = []
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elif self.extractor.method == 'ocrs':
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self.debug = self.extractor.debug
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self.debug_images = []
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for p in pages:
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table = self.extractor.get_tables(p)
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if table is not None:
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tables.update(table)
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if self.extractor.debug:
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if self.extractor.method == 'stream':
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self.debug_text.append(self.extractor.debug_text)
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elif self.extractor.method in ['lattice', 'ocr']:
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self.debug_images.append(self.extractor.debug_images)
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self.debug_segments.append(self.extractor.debug_segments)
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self.debug_tables.append(self.extractor.debug_tables)
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elif self.extractor.method == 'ocrs':
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self.debug_images.append(self.extractor.debug_images)
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if self.clean:
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self.remove_tempdir()
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return tables
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def remove_tempdir(self):
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"""Removes temporary directory that was created to save single
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page pdfs and their images.
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"""
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shutil.rmtree(self.temp)
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def debug_plot(self):
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"""Generates a matplotlib plot based on the selected extractor
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debug option.
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"""
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import matplotlib.pyplot as plt
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import matplotlib.patches as patches
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if self.debug is True:
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if hasattr(self, 'debug_text'):
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for text in self.debug_text:
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fig = plt.figure()
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ax = fig.add_subplot(111, aspect='equal')
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xs, ys = [], []
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for t in text:
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xs.extend([t[0], t[1]])
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ys.extend([t[2], t[3]])
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ax.add_patch(
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patches.Rectangle(
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(t[0], t[1]),
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t[2] - t[0],
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t[3] - t[1]
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)
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)
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ax.set_xlim(min(xs) - 10, max(xs) + 10)
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ax.set_ylim(min(ys) - 10, max(ys) + 10)
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plt.show()
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elif hasattr(self, 'debug_images'):
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for img in self.debug_images:
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plt.imshow(img)
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plt.show()
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elif self.debug == 'contour':
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try:
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for img, table_bbox in self.debug_images:
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for t in table_bbox.keys():
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cv2.rectangle(img, (t[0], t[1]),
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(t[2], t[3]), (255, 0, 0), 3)
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plt.imshow(img)
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plt.show()
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except AttributeError:
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raise ValueError("This option can only be used with Lattice.")
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elif self.debug == 'joint':
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try:
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for img, table_bbox in self.debug_images:
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x_coord = []
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y_coord = []
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||||
for k in table_bbox.keys():
|
||||
for coord in table_bbox[k]:
|
||||
x_coord.append(coord[0])
|
||||
y_coord.append(coord[1])
|
||||
max_x, max_y = max(x_coord), max(y_coord)
|
||||
plt.plot(x_coord, y_coord, 'ro')
|
||||
plt.axis([0, max_x + 100, max_y + 100, 0])
|
||||
plt.imshow(img)
|
||||
plt.show()
|
||||
except AttributeError:
|
||||
raise ValueError("This option can only be used with Lattice.")
|
||||
elif self.debug == 'line':
|
||||
try:
|
||||
for v_s, h_s in self.debug_segments:
|
||||
for v in v_s:
|
||||
plt.plot([v[0], v[2]], [v[1], v[3]])
|
||||
for h in h_s:
|
||||
plt.plot([h[0], h[2]], [h[1], h[3]])
|
||||
plt.show()
|
||||
except AttributeError:
|
||||
raise ValueError("This option can only be used with Lattice.")
|
||||
elif self.debug == 'table':
|
||||
try:
|
||||
for tables in self.debug_tables:
|
||||
for table in tables:
|
||||
for r in range(len(table.rows)):
|
||||
for c in range(len(table.cols)):
|
||||
if table.cells[r][c].left:
|
||||
plt.plot([table.cells[r][c].lb[0],
|
||||
table.cells[r][c].lt[0]],
|
||||
[table.cells[r][c].lb[1],
|
||||
table.cells[r][c].lt[1]])
|
||||
if table.cells[r][c].right:
|
||||
plt.plot([table.cells[r][c].rb[0],
|
||||
table.cells[r][c].rt[0]],
|
||||
[table.cells[r][c].rb[1],
|
||||
table.cells[r][c].rt[1]])
|
||||
if table.cells[r][c].top:
|
||||
plt.plot([table.cells[r][c].lt[0],
|
||||
table.cells[r][c].rt[0]],
|
||||
[table.cells[r][c].lt[1],
|
||||
table.cells[r][c].rt[1]])
|
||||
if table.cells[r][c].bottom:
|
||||
plt.plot([table.cells[r][c].lb[0],
|
||||
table.cells[r][c].rb[0]],
|
||||
[table.cells[r][c].lb[1],
|
||||
table.cells[r][c].rb[1]])
|
||||
plt.show()
|
||||
except AttributeError:
|
||||
raise ValueError("This option can only be used with Lattice.")
|
||||
else:
|
||||
raise UserWarning("This method can only be called after"
|
||||
" debug has been specified.")
|
||||
Loading…
Reference in New Issue