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/*
* alignment.h
*
* Created on: May 23, 2013
* Author: lijunhui
*/
#ifndef ALIGNMENT_H_
#define ALIGNMENT_H_
#include <string>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "stringlib.h"
/*
* Note:
* m_vec_s_align.size() may not be equal to the length of source side
*sentence
* due to the last words may not be aligned
*
*/
struct SAlignment {
typedef std::vector<int> SingleAlign;
SAlignment(const char* pszAlign) { fnInitializeAlignment(pszAlign); }
~SAlignment() {}
bool fnIsAligned(int i, bool s) const {
const std::vector<SingleAlign>* palign;
if (s == true)
palign = &m_vec_s_align;
else
palign = &m_vec_t_align;
if ((*palign)[i].size() == 0) return false;
return true;
}
/*
* return true if [b, e] is aligned phrases on source side (if s==true) or on
* the target side (if s==false);
* return false, otherwise.
*/
bool fnIsAlignedPhrase(int b, int e, bool s, int* pob, int* poe) const {
int ob, oe; //[b, e] on the other side
if (s == true)
fnGetLeftRightMost(b, e, m_vec_s_align, ob, oe);
else
fnGetLeftRightMost(b, e, m_vec_t_align, ob, oe);
if (ob == -1) {
if (pob != NULL) (*pob) = -1;
if (poe != NULL) (*poe) = -1;
return false; // no aligned word among [b, e]
}
if (pob != NULL) (*pob) = ob;
if (poe != NULL) (*poe) = oe;
int bb, be; //[b, e] back given [ob, oe] on the other side
if (s == true)
fnGetLeftRightMost(ob, oe, m_vec_t_align, bb, be);
else
fnGetLeftRightMost(ob, oe, m_vec_s_align, bb, be);
if (bb < b || be > e) return false;
return true;
}
bool fnIsAlignedTightPhrase(int b, int e, bool s, int* pob, int* poe) const {
const std::vector<SingleAlign>* palign;
if (s == true)
palign = &m_vec_s_align;
else
palign = &m_vec_t_align;
if ((*palign).size() <= e || (*palign)[b].size() == 0 ||
(*palign)[e].size() == 0)
return false;
return fnIsAlignedPhrase(b, e, s, pob, poe);
}
void fnGetLeftRightMost(int b, int e, bool s, int& ob, int& oe) const {
if (s == true)
fnGetLeftRightMost(b, e, m_vec_s_align, ob, oe);
else
fnGetLeftRightMost(b, e, m_vec_t_align, ob, oe);
}
/*
* look the translation of source[b, e] is continuous or not
* 1) return "Unaligned": if the source[b, e] is translated silently;
* 2) return "Con't": if none of target words in target[.., ..] is exclusively
* aligned to any word outside source[b, e]
* 3) return "Discon't": otherwise;
*/
std::string fnIsContinuous(int b, int e) const {
int ob, oe;
fnGetLeftRightMost(b, e, true, ob, oe);
if (ob == -1) return "Unaligned";
for (int i = ob; i <= oe; i++) {
if (!fnIsAligned(i, false)) continue;
const SingleAlign& a = m_vec_t_align[i];
int j;
for (j = 0; j < a.size(); j++)
if (a[j] >= b && a[j] <= e) break;
if (j == a.size()) return "Discon't";
}
return "Con't";
}
const SingleAlign* fnGetSingleWordAlign(int i, bool s) const {
if (s == true) {
if (i >= m_vec_s_align.size()) return NULL;
return &(m_vec_s_align[i]);
} else {
if (i >= m_vec_t_align.size()) return NULL;
return &(m_vec_t_align[i]);
}
}
private:
void fnGetLeftRightMost(int b, int e, const std::vector<SingleAlign>& align,
int& ob, int& oe) const {
ob = oe = -1;
for (int i = b; i <= e && i < align.size(); i++) {
if (align[i].size() > 0) {
if (align[i][0] < ob || ob == -1) ob = align[i][0];
if (oe < align[i][align[i].size() - 1])
oe = align[i][align[i].size() - 1];
}
}
}
void fnInitializeAlignment(const char* pszAlign) {
m_vec_s_align.clear();
m_vec_t_align.clear();
std::vector<std::string> terms = SplitOnWhitespace(std::string(pszAlign));
int si, ti;
for (size_t i = 0; i < terms.size(); i++) {
sscanf(terms[i].c_str(), "%d-%d", &si, &ti);
while (m_vec_s_align.size() <= si) {
SingleAlign sa;
m_vec_s_align.push_back(sa);
}
while (m_vec_t_align.size() <= ti) {
SingleAlign sa;
m_vec_t_align.push_back(sa);
}
m_vec_s_align[si].push_back(ti);
m_vec_t_align[ti].push_back(si);
}
// sort
for (size_t i = 0; i < m_vec_s_align.size(); i++) {
std::sort(m_vec_s_align[i].begin(), m_vec_s_align[i].end());
}
for (size_t i = 0; i < m_vec_t_align.size(); i++) {
std::sort(m_vec_t_align[i].begin(), m_vec_t_align[i].end());
}
}
private:
std::vector<SingleAlign> m_vec_s_align; // source side words' alignment
std::vector<SingleAlign> m_vec_t_align; // target side words' alignment
};
struct SAlignmentReader {
SAlignmentReader(const char* pszFname) {
m_fpIn = fopen(pszFname, "r");
assert(m_fpIn != NULL);
}
~SAlignmentReader() {
if (m_fpIn != NULL) fclose(m_fpIn);
}
SAlignment* fnReadNextAlignment() {
if (feof(m_fpIn) == true) return NULL;
char* pszLine = new char[100001];
pszLine[0] = '\0';
fgets(pszLine, 10001, m_fpIn);
int iLen = strlen(pszLine);
if (iLen == 0) return NULL;
while (iLen > 0 && pszLine[iLen - 1] > 0 && pszLine[iLen - 1] < 33) {
pszLine[iLen - 1] = '\0';
iLen--;
}
SAlignment* pAlign = new SAlignment(pszLine);
delete[] pszLine;
return pAlign;
}
private:
FILE* m_fpIn;
};
#endif /* ALIGNMENT_H_ */
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