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BigData/XMLParser.py
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import string | |
import nltk | |
import xml.sax | |
class ReviewHandler(xml.sax.ContentHandler): | |
def __init__(self): | |
self.ids = [] | |
self.title = '' | |
self.reviews = [] | |
self.data = "" | |
def startElement(self, tag, attributes): | |
self.data = '' | |
def endElement(self, tag): | |
if tag == 'unique_id': | |
self.ids.append(clean_data(self.data.strip())) | |
elif tag == 'title': | |
self.title = clean_data(self.data.strip()) | |
elif tag == 'review_text': | |
self.reviews.append(nltk.word_tokenize(self.title + ' ' + clean_data(self.data.strip()))) | |
def characters(self, data): | |
self.data += data | |
def get_reviews(filename): | |
parser = xml.sax.make_parser() | |
f = open(filename, 'rU') | |
data = f.read() | |
cleaned_data = clean_data(data) | |
# hack because review format doesn't have an enclosing tag | |
xmldata = '<reviews>' + cleaned_data + '</reviews>' | |
f.close() | |
handler = ReviewHandler() | |
xml.sax.parseString(xmldata, handler) | |
# Concatenate the review and title. | |
return (handler.ids, handler.reviews) | |
def clean_data(data): | |
# hack because there's a malformed ampersand... | |
cleaned_data = data.replace('&', '&') | |
cleaned_data = cleaned_data.replace('\x1a', '') | |
# hack because there's a u'\ufffd'... wtf is that? | |
cleaned_data2 = '' | |
for char in cleaned_data: | |
if ord(char) < 255: | |
cleaned_data2 += char | |
return cleaned_data2 | |
def get_all_reviews(): | |
filenames = ['sorted_data_acl/books/positive.review', 'sorted_data_acl/books/negative.review', | |
'sorted_data_acl/dvd/positive.review', 'sorted_data_acl/dvd/negative.review', | |
'sorted_data_acl/electronics/positive.review', 'sorted_data_acl/electronics/negative.review', | |
'sorted_data_acl/kitchen_&_housewares/positive.review', 'sorted_data_acl/kitchen_&_housewares/negative.review'] | |
filename_labels = [1, -1, 1, -1, 1, -1, 1, -1] | |
(all_ids, all_reviews, labels) = ([],[],[]) | |
for i in range(len(filenames)): | |
filename = filenames[i] | |
label = filename_labels[i] | |
(ids, reviews) = get_reviews(filename) | |
all_ids += ids | |
all_reviews += reviews | |
labels += [label] * len(ids) | |
return (all_ids, all_reviews, labels) |