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parsers.py
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parsers.py
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import os
import csv
from subprocess import Popen, PIPE
class Parser:
def __init__(self, filename, extension):
if not os.path.isfile(filename):
raise Exception("%s must be a pdf file" % filename)
self._f = open(filename + extension, "wb")
self.writer = csv.writer(self._f)
def close(self):
self._f.close()
class DefaultParser(Parser):
"""Dummy parser which is active at the beginning until something else becomes active"""
def __init__(self, filename):
Parser.__init__(self, filename, ".default.csv")
def is_header(self, line, state):
return False
def parse_line(self, line, state):
pass
class State:
"""Holds information to pass between parsers"""
def __init__(self):
self.year = None
class Pdf2Csv:
def __init__(self, filename, parser_classes):
if not os.path.isfile(filename):
raise Exception("%s must be a pdf file" % filename)
self.parsers = [parser(filename) for parser in parser_classes]
self.filename = filename
self.current_parser = self.parsers[0]
self.state = State()
def pdf_to_csv(self):
output = Popen(["pdftotext", "-layout", self.filename, "-"], stdout=PIPE).communicate()[0]
for line in output.split("\n"):
line = line.strip()
for parser in self.parsers:
if parser.is_header(line, self.state):
self.current_parser = parser
break
else:
self.current_parser.parse_line(line, self.state)
def close(self):
for parser in self.parsers:
parser.close()