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# cdat.pyx
# Defines "data arrays" that can be directly written to/read from disk in binary format
# In particular, the array itself is written/read directly as a glob of binary data
# Adam Lopez <alopez@cs.umd.edu>
import sys
import gzip
import log
import cintlist
from libc.stdio cimport FILE, fopen, fread, fwrite, fclose
from libc.stdlib cimport malloc, realloc, free
from libc.string cimport memset, strcpy, strlen
cdef class DataArray:
def __init__(self, filename=None, from_binary=False, use_sent_id=False):
self.word2id = {"END_OF_FILE":0, "END_OF_LINE":1}
self.id2word = ["END_OF_FILE", "END_OF_LINE"]
self.data = cintlist.CIntList(1000,1000)
self.sent_id = cintlist.CIntList(1000,1000)
self.sent_index = cintlist.CIntList(1000,1000)
self.use_sent_id = use_sent_id
if filename is not None:
if from_binary:
self.read_binary(filename)
else:
self.read_text(filename)
def __len__(self):
return len(self.data)
def getSentId(self, i):
return self.sent_id.arr[i]
def getSent(self, i):
cdef int j, start, stop
sent = []
start = self.sent_index.arr[i]
stop = self.sent_index.arr[i+1]
for i from start <= i < stop:
sent.append(self.id2word[self.data.arr[i]])
return sent
def getSentPos(self, loc):
return loc - self.sent_index.arr[self.sent_id.arr[loc]]
def get_id(self, word):
if not word in self.word2id:
self.word2id[word] = len(self.id2word)
self.id2word.append(word)
return self.word2id[word]
def get_word(self, id):
return self.id2word[id]
def write_text(self, filename):
f = open(filename, "w")
for w_id in self.data:
if w_id > 1:
f.write("%s " % self.get_word(w_id))
if w_id == 1:
f.write("\n")
f.close()
def read_text(self, filename):
cdef int word_count
if filename[-2:] == "gz":
file = gzip.GzipFile(filename)
else:
file = open(filename)
word_count = 0
for line_num, line in enumerate(file):
self.sent_index.append(word_count)
for word in line.split():
self.data.append(self.get_id(word))
if self.use_sent_id:
self.sent_id.append(line_num)
word_count = word_count + 1
self.data.append(1)
if self.use_sent_id:
self.sent_id.append(line_num)
word_count = word_count + 1
self.data.append(0)
self.sent_index.append(word_count)
def read_binary(self, filename):
cdef FILE* f
cdef bytes bfilename = filename
cdef char* cfilename = bfilename
f = fopen(cfilename, "r")
self.read_handle(f)
fclose(f)
cdef void read_handle(self, FILE* f):
cdef int num_words
cdef int word_len
cdef char* c_word
cdef bytes py_word
self.data.read_handle(f)
self.sent_index.read_handle(f)
self.sent_id.read_handle(f)
fread(&(num_words), sizeof(int), 1, f)
for i in xrange(num_words):
fread(&(word_len), sizeof(int), 1, f)
c_word = <char*> malloc (word_len * sizeof(char))
fread(c_word, sizeof(char), word_len, f)
py_word = c_word
free(c_word)
self.word2id[py_word] = len(self.id2word)
self.id2word.append(py_word)
if len(self.sent_id) == 0:
self.use_sent_id = False
else:
self.use_sent_id = True
cdef void write_handle(self, FILE* f):
cdef int word_len
cdef int num_words
cdef char* c_word
self.data.write_handle(f)
self.sent_index.write_handle(f)
self.sent_id.write_handle(f)
num_words = len(self.id2word) - 2
fwrite(&(num_words), sizeof(int), 1, f)
for word in self.id2word[2:]:
c_word = word
word_len = strlen(c_word) + 1
fwrite(&(word_len), sizeof(int), 1, f)
fwrite(c_word, sizeof(char), word_len, f)
def write_binary(self, filename):
cdef FILE* f
cdef bytes bfilename = filename
cdef char* cfilename = bfilename
f = fopen(cfilename, "w")
self.write_handle(f)
fclose(f)
def write_enhanced_handle(self, f):
for i in self.data:
f.write("%d " %i)
f.write("\n")
for i in self.sent_index:
f.write("%d " %i)
f.write("\n")
for i in self.sent_id:
f.write("%d " %i)
f.write("\n")
for word in self.id2word:
f.write("%s %d " % (word, self.word2id[word]))
f.write("\n")
def write_enhanced(self, filename):
f = open(filename, "w")
self.write_enhanced_handle(self, f)
f.close()
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