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rsd2ltf.py
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executable file
·234 lines (191 loc) · 8.08 KB
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#encoding=utf-8
import os
import argparse
import sys
import itertools
import xml.dom.minidom
import xml.etree.ElementTree as ET
import codecs
# dirty import from current dir
script_dirname = os.path.dirname(os.path.abspath(__file__))
sys.path.append(script_dirname)
from tokenizer import Tokenizer
def rsd2ltf(rsd_str, doc_id,
seg_option='linebreak',
tok_option='unitok',
re_segment=False):
tokenizer = Tokenizer(seg_option, tok_option)
if re_segment:
# running segmentation and tokenization, then re-segment the tokenized
# sentences (use space to concatenate tokens. this solves segmentation
# problem, e.g. How are you?I'm fine.).
sents = tokenizer.run_segmenter(rsd_str)
raw_tokens = tokenizer.run_tokenizer(sents)
# re-segment tokenized sentence
num_sent_reseg = 0
tokens = []
for i, t in enumerate(raw_tokens):
reseg = [item.split() for item in tokenizer.run_segmenter(' '.join(t))]
if len(reseg) > 1:
num_sent_reseg += 1
tokens += reseg
# compute offset for each token
indexer = 0
token_offset = []
for i, t in enumerate(itertools.chain(*tokens)):
while not rsd_str[indexer:].startswith(t) and \
indexer < len(rsd_str):
indexer += 1
if indexer < len(rsd_str):
t_start = indexer
t_end = t_start + len(t) - 1
assert rsd_str[t_start:t_end + 1] == t, \
"re_segment token offset not match %s-%d" % (doc_id, i)
token_offset.append((t_start, t_end))
indexer = t_end + 1
assert len(token_offset) == len(list(itertools.chain(*tokens))), \
"re_segment tokenization offset error in: %s" % doc_id
# recover sent using tokens
sents = []
prev_token_end = token_offset[0][0]-1
token_index = 0
for i, t in enumerate(tokens):
sent = ''
for j, item in enumerate(t):
if j == 0:
prev_token_end = token_offset[token_index][0] - 1
sent += ' ' * (token_offset[token_index][0] - prev_token_end - 1) + item
prev_token_end = token_offset[token_index][1]
token_index += 1
assert sent in rsd_str, \
're_segment sentence offset error.'
sents.append(sent)
else:
# running segmentation and tokenization
sents = tokenizer.run_segmenter(rsd_str)
tokens = tokenizer.run_tokenizer(sents)
# generate offset for sentences and tokens
indexer = 0
sent_offset = []
for i, s in enumerate(sents):
while not rsd_str[indexer:].startswith(s) and indexer < len(rsd_str):
indexer += 1
if indexer < len(rsd_str):
sent_start = indexer
sent_end = sent_start + len(s) - 1
assert rsd_str[sent_start:sent_end+1] == s, \
"sentence offset not match %s-%d" % (doc_id, i)
sent_offset.append((sent_start, sent_end))
indexer = sent_end + 1
assert len(sent_offset) == len(sents), \
"sentence segmentation offset error in: %s" % doc_id
token_offsets = []
for i, tok in enumerate(tokens):
sent_text = sents[i]
indexer = 0
t_offset = []
for j, t in enumerate(tok):
while not sent_text[indexer:].startswith(t) and \
indexer < len(sent_text):
indexer += 1
if indexer < len(sent_text):
t_start = indexer
t_end = t_start + len(t) - 1
assert sent_text[t_start:t_end+1] == t, \
"token offset not match %s-%d-%d" % (doc_id, i, j)
t_offset.append((t_start, t_end))
indexer = t_end + 1
token_offsets.append(t_offset)
assert len(t_offset) == len(tok), \
"tokenization offset error in: %s-%d" % (doc_id, i)
# convert seg/tok result to ltf
root = ET.Element('LCTL_TEXT')
doc_element = ET.Element('DOC', {'id': doc_id})
text_element = ET.Element('TEXT')
root.append(doc_element)
doc_element.append(text_element)
for i in range(len(sents)):
seg_text = sents[i]
seg_start_char = sent_offset[i][0]
seg_end_char = sent_offset[i][1]
seg_id = '%s-%s' % (doc_id, str(i))
seg_element = ET.Element('SEG', {'id': seg_id,
'start_char': str(seg_start_char),
'end_char': str(seg_end_char)})
original_text_element = ET.Element('ORIGINAL_TEXT')
original_text_element.text = seg_text
seg_element.append(original_text_element)
for j in range(len(tokens[i])):
token_id = 'token-%d-%d' % (i, j)
tok_text = tokens[i][j]
if not tok_text:
continue
tok_start_char = int(token_offsets[i][j][0]) + seg_start_char
tok_end_char = int(token_offsets[i][j][1]) + seg_start_char
assert rsd_str[tok_start_char:tok_end_char+1] == tok_text
token_element = ET.Element('TOKEN',
{'id': token_id,
'start_char': str(tok_start_char),
'end_char': str(tok_end_char)})
token_element.text = tok_text
seg_element.append(token_element)
text_element.append(seg_element)
return root
def write2file(ltf_root, out_file):
# pretty print xml
root_str = ET.tostring(ltf_root, 'utf-8')
f_xml = xml.dom.minidom.parseString(root_str)
pretty_xml_as_string = f_xml.toprettyxml(encoding="utf-8")
f = open(out_file, 'wb')
f.write(pretty_xml_as_string)
f.close()
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument('--rsd', type=str,
help='input rsd file path or directory.')
parser.add_argument('--ltf', type=str,
help='output ltf file path or directory.')
t = Tokenizer()
parser.add_argument('--seg_option', default='nltk+linebreak',
help="segmentation options: %s (default is linebreak)" %
', '.join(t.segmenters.keys()))
parser.add_argument('--tok_option', default='unitok',
help="tokenization options: %s (default is unitok)" %
', '.join(t.tokenizers.keys()))
parser.add_argument('--extension', default=".sgm",
help="extension of rsd file")
parser.add_argument('--re_segment', action='store_true', default=False,
help='first run tokenizaiton, and then segmentation.')
args = parser.parse_args()
input_rsd = args.rsd
output_ltf = args.ltf
seg_option = args.seg_option
tok_option = args.tok_option
extension = args.extension
re_segment = args.re_segment
rsd_files = []
output_files = []
if os.path.isdir(input_rsd):
if not os.path.exists(output_ltf):
os.makedirs(output_ltf)
for fn in os.listdir(input_rsd):
if extension not in fn:
continue
rsd_files.append(os.path.join(input_rsd, fn))
output_files.append(os.path.join(output_ltf,
fn.replace(extension, '.ltf.xml')))
else:
rsd_files = [input_rsd]
output_files = [output_ltf]
for k, rsd_f in enumerate(rsd_files):
try:
rsd_str = codecs.open(rsd_f, 'r', 'utf-8').read()
doc_id = os.path.basename(rsd_f).replace(extension, '')
ltf_root = rsd2ltf(rsd_str, doc_id, seg_option, tok_option,
re_segment)
write2file(ltf_root, output_files[k])
except AssertionError as e:
print(e)
sys.stdout.write('%d files processed.\r' % k)
sys.stdout.flush()
sys.stdout.write('%d files processed.' % len(rsd_files))