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from libc.stdio cimport FILE, fopen, fread, fwrite, fclose
from libc.stdlib cimport malloc, realloc, free
# Note: Callison-Burch uses short instead of int.
# We have the space for our corpus, so this is not a problem;
# May need to revisit if things get really tight, though.
cdef int ALIGNMENT_CODE = 1 << 16
cdef class Alignment:
cdef IntList links
cdef IntList sent_index
cdef int link(self, int i, int j):
"""Integerizes an alignment link pair"""
return i * ALIGNMENT_CODE + j
def unlink(self, link):
"""De-integerizes an alignment link pair"""
return (link / ALIGNMENT_CODE, link % ALIGNMENT_CODE)
cdef _unlink(self, int link, int* f, int* e):
f[0] = link / ALIGNMENT_CODE
e[0] = link % ALIGNMENT_CODE
def get_sent_links(self, int sent_id):
cdef IntList sent_links
cdef int* arr
cdef int arr_len
sent_links = IntList()
arr = self._get_sent_links(sent_id, &arr_len)
sent_links._extend_arr(arr, arr_len*2)
free(arr)
return sent_links
cdef int* _get_sent_links(self, int sent_id, int* num_links):
cdef int* sent_links
cdef int i, start, end
start = self.sent_index.arr[sent_id]
end = self.sent_index.arr[sent_id+1]
num_links[0] = end - start
sent_links = <int*> malloc(2*num_links[0]*sizeof(int))
for i from 0 <= i < num_links[0]:
self._unlink(self.links.arr[start + i], sent_links + (2*i), sent_links + (2*i) + 1)
return sent_links
def __cinit__(self, from_binary=None, from_text=None):
self.links = IntList(1000,1000)
self.sent_index = IntList(1000,1000)
if from_binary:
self.read_binary(from_binary)
elif from_text:
self.read_text(from_text)
def read_text(self, char* filename):
with gzip_or_text(filename) as f:
for line in f:
self.sent_index.append(len(self.links))
pairs = line.split()
for pair in pairs:
(i, j) = map(int, pair.split('-'))
self.links.append(self.link(i, j))
self.sent_index.append(len(self.links))
def read_binary(self, char* filename):
cdef FILE* f
f = fopen(filename, "r")
self.links.read_handle(f)
self.sent_index.read_handle(f)
fclose(f)
def write_text(self, char* filename):
with open(filename, "w") as f:
sent_num = 0
for i, link in enumerate(self.links):
while i >= self.sent_index[sent_num]:
f.write("\n")
sent_num = sent_num + 1
f.write("%d-%d " % self.unlink(link))
f.write("\n")
def write_binary(self, char* filename):
cdef FILE* f
f = fopen(filename, "w")
self.links.write_handle(f)
self.sent_index.write_handle(f)
fclose(f)
def write_enhanced(self, char* filename):
with open(filename, "w") as f:
for link in self.links:
f.write("%d " % link)
f.write("\n")
for i in self.sent_index:
f.write("%d " % i)
f.write("\n")
def alignment(self, i):
"""Return all (e,f) pairs for sentence i"""
cdef int j, start, end
result = []
start = self.sent_index.arr[i]
end = self.sent_index.arr[i+1]
for j from start <= j < end:
result.append(self.unlink(self.links.arr[j]))
return result
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