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ExtractXML.py
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ExtractXML.py
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from pdfminer.pdfparser import PDFParser
from pdfminer.pdfdocument import PDFDocument
from pdfminer.pdfpage import PDFPage
from pdfminer.pdfpage import PDFTextExtractionNotAllowed
from pdfminer.pdfinterp import PDFResourceManager
from pdfminer.pdfinterp import PDFPageInterpreter
from pdfminer.pdfdevice import PDFDevice
from pdfminer.layout import LAParams
from pdfminer.converter import PDFPageAggregator
import pdfminer
import codecs
import re
import csv
from xml.sax.saxutils import escape
import numpy as np
import os
import glob
import joblib
import unicodedata
import html
from collections import Counter
# Global Variables
laparams=LAParams()
setattr(laparams, 'all_texts', True)
# Functions for calculating text features
def isbold(obj):
isbold = 1
for element in obj:
for c in element:
if isinstance(c, pdfminer.layout.LTChar):
font_name = c.fontname.lower()
if "bold" not in font_name:
isbold = 0
return isbold
return isbold
def isitalic(obj):
isitalic = 1
for element in obj:
for c in element:
if isinstance(c, pdfminer.layout.LTChar):
font_name = c.fontname.lower()
if "italic" not in font_name:
isitalic = 0
return isitalic
return isitalic
def size(obj):
sizes = Counter()
for element in obj:
if isinstance(element, pdfminer.layout.LTChar):
sizes.update([element.size])
elif isinstance(element, pdfminer.layout.LTTextLineHorizontal):
for c in element:
if isinstance(c, pdfminer.layout.LTChar):
sizes.update([c.size])
if len(sizes) == 0:
return 1
return sizes.most_common(1)[0][0]
class Textbox(object):
def __init__(self, lttb, pagenr, pagesize, bbox, isbold, isitalic, size, text):
self.LTTB_list = [lttb]
self.pagenr = pagenr
self.pagesize = pagesize
self.bbox = bbox #x0, y0, x1, y1
self.text = text
self.margins = [pagesize[3] - bbox[3],bbox[0] - pagesize[0],bbox[1] - pagesize[1],pagesize[2] - bbox[2]]
self.box_l = 0
self.box_r = 0
self.box_o = 0
self.box_d = 0
self.isbold = isbold
self.isitalic = isitalic
self.size = size
self.area = (bbox[0] - bbox[2]) * (bbox[1] - bbox[3]) / 10000.0
self.height = (bbox[3] - bbox[1])
self.width = (bbox[2] - bbox[0])
self.len = len(text) #original: with double blanks, line breaks,...
#functions to order Textboxes by their upper left corner
#these functions are needed to enable sorting of Textboxes
def __eq__(self, other):
return ((self.pagenr, self.bbox[0], self.bbox[1] ) == (other.pagenr, other.bbox[0], other.bbox[1]))
def __ne__(self, other):
return ((self.pagenr, self.bbox[0], self.bbox[1] ) != (other.pagenr, other.bbox[0], other.bbox[1]))
def __lt__(self, other):
if self.pagenr < other.pagenr:
return True
if self.pagenr > other.pagenr:
return False
if self.bbox[1] > other.bbox[3]:
return True
if self.bbox[3] < other.bbox[1]:
return False
if self.bbox[0] < other.bbox[0]:
return True
return False
def __le__(self, other):
return (self < other or self == other)
def __gt__(self, other):
return other < self
def __ge__(self, other):
return other <= self
def h_overlap(self,other,strict = False):
if strict:
return (self.bbox[0] <= other.bbox[0] <= self.bbox[2]) or (self.bbox[0] <= other.bbox[2] <= self.bbox[2])
if (self.bbox[0] <= other.bbox[0] <= self.bbox[2]) or (self.bbox[0] <= other.bbox[2] <= self.bbox[2]):
overlap = min(self.bbox[2],other.bbox[2]) - max(self.bbox[0],other.bbox[0])
if overlap > 0.3 * min(self.bbox[2] - self.bbox[0] , other.bbox[2] - other.bbox[0]):
return True
return False
def v_overlap(self,other, strict = False):
if strict:
return (self.bbox[1] <= other.bbox[1] <= self.bbox[3]) or (self.bbox[1] <= other.bbox[3] <= self.bbox[3])
if (self.bbox[0] <= other.bbox[1] <= self.bbox[3]) or (self.bbox[1] <= other.bbox[3] <= self.bbox[3]):
overlap = min(self.bbox[3],other.bbox[3]) - max(self.bbox[1],other.bbox[1])
if overlap > 0.3 * min(self.bbox[3] - self.bbox[1] , other.bbox[3] - other.bbox[1]):
return True
return False
def get_feats(self):
return [self.bbox[0],self.bbox[1],self.bbox[2],self.bbox[3],self.margins[0],self.margins[1],self.margins[2],self.margins[3],self.box_l,self.box_r,self.box_o,self.box_d,self.isbold,self.isitalic,self.size,self.area,self.height,self.width,self.len]
# Functions to analyze a PDF document
# Find all text boxes, collect information on these boxes and return a list of complex objects representing the boxes
def getTextDecorated(obj):
text = ""
sizes = []
lb = []
#ub =[]
for element in obj:
for c in element:
if isinstance(c, pdfminer.layout.LTChar) and not c.get_text().startswith('(cid:'):
text += c.get_text()
sizes.append(c.size)
lb.append(c.bbox[1])
#ub.append(c.bbox[3])
else:
ct = c.get_text()
text += ct
sizes.extend(len(ct)*[0])
lb.extend(len(ct)*[0])
#ub.append(0)
sizecnt = Counter(sizes)
mainsize = sizecnt.most_common()[0][0]
textdec = ""
sup = False
#sub = False
for i in range(len(sizes)):
s = sizes[i]
c = text[i]
if i > 0 and 0 < s < 0.8*mainsize and c in "0123456789-": #not in ' \t\r\n\.,-=':
if not sup and lb[i] > lb[i-1] :
textdec += '|sup|'
sup = True
#sub = False
#elif not sub and ub[i] < ub[i-1] :
# textdec += '|sub|'
# sub = True
# sup = False
elif sup:
textdec += '|/sup|'
sup = False
#elif sub:
# textdec += '|/sub|'
# sub = False
textdec += c
if sup:
textdec += '|/sup|'
#elif sub:
# textdec += '|/sub|'
return textdec
def parse_obj(pagenr,pagesize,lt_objs):
elements = []
# loop over the object list
for obj in lt_objs:
# if it's a textbox, print text and location
if isinstance(obj, pdfminer.layout.LTTextBoxHorizontal):
#text = obj.get_text()
text = getTextDecorated(obj)
elements.append(Textbox(obj,pagenr, pagesize,(obj.bbox[0], obj.bbox[1], obj.bbox[2], obj.bbox[3]) ,isbold(obj), isitalic(obj), size(obj), text))
# if it's a container, recurse
elif isinstance(obj, pdfminer.layout.LTFigure):
elements.extend(parse_obj(pagenr,pagesize,obj._objs))
return elements
def read_pdf(file):
elements = []
# Open a PDF file.
fp = open(file, 'rb')
# Create a PDF parser object associated with the file object.
parser = PDFParser(fp)
document = PDFDocument(parser)
# Check if the document allows text extraction. If not, abort.
if not document.is_extractable:
return []
#raise PDFTextExtractionNotAllowed
# Create a PDF resource manager object that stores shared resources.
rsrcmgr = PDFResourceManager()
# Create a PDF device object.
device = PDFDevice(rsrcmgr)
# Create a PDF page aggregator object.
device = PDFPageAggregator(rsrcmgr, laparams=laparams)
# Create a PDF interpreter object.
interpreter = PDFPageInterpreter(rsrcmgr, device)
# loop over all pages in the document
page_nr = 0
for page in PDFPage.create_pages(document):
# read the page into a layout object
interpreter.process_page(page)
layout = device.get_result()
# print(layout) # Seitengröße und Rotationsgrad
# extract text from this object
elements.extend(parse_obj(page_nr,page.mediabox,layout._objs))
#for page.cropbox , mediabox is paper size, cropbox is printable size
page_nr += 1
return elements
def neighbor_box(elements):
for e in elements:
elements_page = []
box_o,box_d,box_l,box_r = 0, 0, 0, 0
for e_er in elements: #Summarize all elements per page
if e.pagenr == e_er.pagenr:
elements_page.append(e_er)
else:
continue
for e_page in elements_page: #For all elements on a page check if there are adjacent boxes
if e.v_overlap(e_page):
if e.bbox[0] < e_page.bbox[0]:
e.box_r = 1
elif e.bbox[0] > e_page.bbox[0]:
e.box_l = 1
if e.h_overlap(e_page):
if e.bbox[1] < e_page.bbox[1]:
e.box_o = 1
elif e.bbox[1] > e_page.bbox[1]:
e.box_d = 1
elif ((e.bbox[0] >= e_page.bbox[0]) and (e.bbox[2] < e_page.bbox[2])) or ((e.bbox[0] <= e_page.bbox[0]) and (e.bbox[2] > e_page.bbox[2])):
if e.bbox[1] < e_page.bbox[1]:
e.box_o = 1
elif e.bbox[1] > e_page.bbox[1]:
e.box_d = 1
return elements
def CleanInvalidXmlChars(text):
#From xml spec valid chars:
# #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]
# any Unicode character, excluding the surrogate blocks, FFFE, and FFFF.
return re.sub(r"[^\x09\x0A\x0D\x20-\uD7FF\uE000-\uFFFD\u10000-\u10FFFF]", "",text);
def write_txt(elements,linedist,file_out_txt,file_in):
file = codecs.open(file_out_txt,'w+','utf-8')
print("<extracted source='%s'>"%file_in,file=file)
pagenr = -1
page_open = False
txt_open = False
isbold = False
isitalic = False
fontsize = -1
lowerb = 1000000
leftb = 0
for e in elements:
if e.pagenr != pagenr:
pagenr = e.pagenr
if txt_open:
print("</txt>",file=file)
txt_open = False
if page_open:
print("</page>",file=file)
print("<page nr='%d'>"%pagenr,file=file)
page_open = True
isbold = False
isitalic = False
fontsize = -1
margin = abs(lowerb - e.bbox[3])
offset = abs(leftb - e.bbox[0])
if margin > 0.2 + linedist.get(fontsize,5.8) or offset > 2 * fontsize or round(e.size,2) != fontsize or e.isitalic != isitalic or e.isbold != isbold:
#if margin > 0.6 * max(10,fontsize) or offset > 2 * fontsize or round(e.size,2) != fontsize or e.isitalic != isitalic or e.isbold != isbold:
isbold = e.isbold
isitalic = e.isitalic
fontsize = round(e.size,2)
if txt_open:
print("</txt>",file=file)
print("<txt fontsize='%.2f' italic='%s' bold='%s'>"%(fontsize,str(isitalic),str(isbold)),file=file)
txt_open = True
cleantext = CleanInvalidXmlChars(e.text)
xmltext = html.escape(cleantext)
xmltext = re.sub("\|sup\|","<sup>",xmltext)
xmltext = re.sub("\|/sup\|","</sup>",xmltext)
xmltext = re.sub("\|sub\|","<sub>",xmltext)
xmltext = re.sub("\|/sub\|","</sub>",xmltext)
file.write(xmltext)
lowerb = e.bbox[1]
leftb = e.bbox[0]
if txt_open:
print("</txt>",file=file)
print("</page>",file=file)
print("</extracted>",file=file)
file.close()
def extract_classify_contract(file_in):
elements = read_pdf(file_in)
elements = sorted(elements)
elements = neighbor_box(elements)
return elements
def linedistance(elements):
linemargins = {}
prev_bottom = 0
prev_fontsize = 0
fontsize = 0
bottom = 0
top = 0
for e in elements:
lttbox = e.LTTB_list[0]
if isinstance(lttbox, pdfminer.layout.LTTextBoxHorizontal):
for line in lttbox:
if isinstance(line, pdfminer.layout.LTTextLineHorizontal):
bottom = line.bbox[1]
top = line.bbox[3]
fontsize = round(size(line),2)
m = round(prev_bottom - top,1)
#print(prev_bottom, top, bottom)
if 0 < m < 20 and prev_fontsize == fontsize:
lm_font = linemargins.get(fontsize,Counter())
lm_font.update([m])
linemargins[fontsize] = lm_font
prev_bottom = bottom
prev_fontsize = fontsize
linemargins = {fs:cnt.most_common()[0][0] for fs,cnt in linemargins.items()}
return linemargins
filelist = glob.glob("PDF/*.pdf")
for f in filelist:
print(f)
elements = extract_classify_contract(f)
ld = linedistance(elements)
f_base = os.path.basename(f)
file = f_base[:-4]
file_out_txt = 'XML/'+file +'.xml'
write_txt(elements,ld,file_out_txt,f)