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#include "Alignment.h"
#include <fstream>
#include <string>
#include <stdlib.h>
#include <cstring>
namespace
{
const int LINE_MAX_LENGTH = 10000;
} // namespace
using namespace std;
void Alignment::Create(const string& fileName)
{
ifstream textFile;
char line[LINE_MAX_LENGTH];
// count the number of words first;
textFile.open(fileName.c_str());
if (!textFile) {
cerr << "No such file or directory: " << fileName << endl;
exit(1);
}
istream *fileP = &textFile;
m_size = 0;
m_sentenceCount = 0;
while(!fileP->eof()) {
SAFE_GETLINE((*fileP), line, LINE_MAX_LENGTH, '\n');
if (fileP->eof()) break;
vector<string> alignmentSequence = Tokenize( line );
m_size += alignmentSequence.size();
m_sentenceCount++;
}
textFile.close();
cerr << m_size << " alignment points" << endl;
// allocate memory
m_array = (int*) calloc( sizeof(int), m_size*2 );
m_sentenceEnd = (INDEX*) calloc( sizeof( INDEX ), m_sentenceCount );
if (m_array == NULL) {
cerr << "Error: cannot allocate memory to m_array" << endl;
exit(1);
}
if (m_sentenceEnd == NULL) {
cerr << "Error: cannot allocate memory to m_sentenceEnd" << endl;
exit(1);
}
// fill the array
int alignmentPointIndex = 0;
int sentenceId = 0;
textFile.open(fileName.c_str());
if (!textFile) {
cerr << "Failed to open " << fileName << endl;
exit(1);
}
fileP = &textFile;
while(!fileP->eof()) {
SAFE_GETLINE((*fileP), line, LINE_MAX_LENGTH, '\n');
if (fileP->eof()) break;
vector<string> alignmentSequence = Tokenize( line );
for(size_t i=0; i<alignmentSequence.size(); i++) {
int s,t;
// cout << "scaning " << alignmentSequence[i].c_str() << endl;
if (! sscanf(alignmentSequence[i].c_str(), "%d-%d", &s, &t)) {
cerr << "WARNING: " << alignmentSequence[i] << " is a bad alignment point in sentence " << sentenceId << endl;
}
m_array[alignmentPointIndex++] = (char) s;
m_array[alignmentPointIndex++] = (char) t;
}
m_sentenceEnd[ sentenceId++ ] = alignmentPointIndex - 2;
}
textFile.close();
cerr << "done reading " << (alignmentPointIndex/2) << " alignment points, " << sentenceId << " sentences." << endl;
}
Alignment::Alignment()
: m_array(NULL),
m_sentenceEnd(NULL),
m_size(0),
m_sentenceCount(0) {}
Alignment::~Alignment()
{
if (m_array != NULL) {
free(m_array);
}
if (m_sentenceEnd != NULL) {
free(m_sentenceEnd);
}
}
vector<string> Alignment::Tokenize( const char input[] )
{
vector< string > token;
bool betweenWords = true;
int start=0;
int i=0;
for(; input[i] != '\0'; i++) {
bool isSpace = (input[i] == ' ' || input[i] == '\t');
if (!isSpace && betweenWords) {
start = i;
betweenWords = false;
} else if (isSpace && !betweenWords) {
token.push_back( string( input+start, i-start ) );
betweenWords = true;
}
}
if (!betweenWords)
token.push_back( string( input+start, i-start ) );
return token;
}
bool Alignment::PhraseAlignment( INDEX sentence, int target_length,
int source_start, int source_end,
int &target_start, int &target_end,
int &pre_null, int &post_null )
{
// get index for first alignment point
INDEX sentenceStart = 0;
if (sentence > 0) {
sentenceStart = m_sentenceEnd[ sentence-1 ] + 2;
}
// get target phrase boundaries
target_start = target_length;
target_end = 0;
for(INDEX ap = sentenceStart; ap <= m_sentenceEnd[ sentence ]; ap += 2 ) {
int source = m_array[ ap ];
if (source >= source_start && source <= source_end ) {
int target = m_array[ ap+1 ];
if (target < target_start) target_start = target;
if (target > target_end ) target_end = target;
}
}
if (target_start == target_length) {
return false; // done if no alignment points
}
// check consistency
for(INDEX ap = sentenceStart; ap <= m_sentenceEnd[ sentence ]; ap += 2 ) {
int target = m_array[ ap+1 ];
if (target >= target_start && target <= target_end ) {
int source = m_array[ ap ];
if (source < source_start || source > source_end) {
return false; // alignment point out of range
}
}
}
// create array for unaligned words
for( int i=0; i<target_length; i++ ) {
m_unaligned[i] = true;
}
for(INDEX ap = sentenceStart; ap <= m_sentenceEnd[ sentence ]; ap += 2 ) {
int target = m_array[ ap+1 ];
m_unaligned[ target ] = false;
}
// prior unaligned words
pre_null = 0;
for(int target = target_start-1; target >= 0 && m_unaligned[ target ]; target--) {
pre_null++;
}
// post unaligned words;
post_null = 0;
for(int target = target_end+1; target < target_length && m_unaligned[ target ]; target++) {
post_null++;
}
return true;
}
void Alignment::Save(const string& fileName ) const
{
FILE *pFile = fopen ( (fileName + ".align").c_str() , "w" );
if (pFile == NULL) {
cerr << "Cannot open " << fileName << ".align" << endl;
exit(1);
}
fwrite( &m_size, sizeof(INDEX), 1, pFile );
fwrite( m_array, sizeof(int), m_size*2, pFile ); // corpus
fwrite( &m_sentenceCount, sizeof(INDEX), 1, pFile );
fwrite( m_sentenceEnd, sizeof(INDEX), m_sentenceCount, pFile); // sentence index
fclose( pFile );
}
void Alignment::Load(const string& fileName )
{
FILE *pFile = fopen ( (fileName + ".align").c_str() , "r" );
if (pFile == NULL) {
cerr << "no such file or directory: " << fileName << ".align" << endl;
exit(1);
}
cerr << "loading from " << fileName << ".align" << endl;
fread( &m_size, sizeof(INDEX), 1, pFile );
cerr << "alignment points in corpus: " << m_size << endl;
m_array = (int*) calloc( sizeof(int), m_size*2 );
fread( m_array, sizeof(int), m_size*2, pFile ); // corpus
fread( &m_sentenceCount, sizeof(INDEX), 1, pFile );
cerr << "sentences in corpus: " << m_sentenceCount << endl;
m_sentenceEnd = (INDEX*) calloc( sizeof(INDEX), m_sentenceCount );
fread( m_sentenceEnd, sizeof(INDEX), m_sentenceCount, pFile); // sentence index
fclose( pFile );
cerr << "done loading\n";
}
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