2010-10-21 13:49:27 +04:00
|
|
|
#include "SuffixArray.h"
|
|
|
|
#include <string>
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <cstring>
|
|
|
|
|
2012-05-07 18:08:37 +04:00
|
|
|
namespace {
|
|
|
|
|
|
|
|
const int LINE_MAX_LENGTH = 10000;
|
|
|
|
|
|
|
|
} // namespace
|
|
|
|
|
2010-10-21 13:49:27 +04:00
|
|
|
using namespace std;
|
|
|
|
|
2011-02-24 16:57:11 +03:00
|
|
|
void SuffixArray::Create( string fileName )
|
2010-10-21 13:49:27 +04:00
|
|
|
{
|
2011-02-24 16:57:11 +03:00
|
|
|
m_vcb.StoreIfNew( "<uNk>" );
|
|
|
|
m_endOfSentence = m_vcb.StoreIfNew( "<s>" );
|
|
|
|
|
|
|
|
ifstream textFile;
|
|
|
|
char line[LINE_MAX_LENGTH];
|
|
|
|
|
|
|
|
// count the number of words first;
|
|
|
|
textFile.open(fileName.c_str());
|
|
|
|
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< WORD_ID > words = m_vcb.Tokenize( line );
|
|
|
|
m_size += words.size() + 1;
|
|
|
|
m_sentenceCount++;
|
|
|
|
}
|
|
|
|
textFile.close();
|
|
|
|
cerr << m_size << " words (incl. sentence boundaries)" << endl;
|
|
|
|
|
|
|
|
// allocate memory
|
|
|
|
m_array = (WORD_ID*) calloc( sizeof( WORD_ID ), m_size );
|
|
|
|
m_index = (INDEX*) calloc( sizeof( INDEX ), m_size );
|
|
|
|
m_wordInSentence = (char*) calloc( sizeof( char ), m_size );
|
|
|
|
m_sentence = (INDEX*) calloc( sizeof( INDEX ), m_size );
|
|
|
|
m_sentenceLength = (char*) calloc( sizeof( char ), m_sentenceCount );
|
|
|
|
|
|
|
|
// fill the array
|
|
|
|
int wordIndex = 0;
|
|
|
|
int sentenceId = 0;
|
|
|
|
textFile.open(fileName.c_str());
|
|
|
|
fileP = &textFile;
|
|
|
|
while(!fileP->eof()) {
|
|
|
|
SAFE_GETLINE((*fileP), line, LINE_MAX_LENGTH, '\n');
|
|
|
|
if (fileP->eof()) break;
|
|
|
|
vector< WORD_ID > words = m_vcb.Tokenize( line );
|
|
|
|
vector< WORD_ID >::const_iterator i;
|
|
|
|
|
|
|
|
for( i=words.begin(); i!=words.end(); i++) {
|
|
|
|
m_index[ wordIndex ] = wordIndex;
|
|
|
|
m_sentence[ wordIndex ] = sentenceId;
|
|
|
|
m_wordInSentence[ wordIndex ] = i-words.begin();
|
|
|
|
m_array[ wordIndex++ ] = *i;
|
|
|
|
}
|
|
|
|
m_index[ wordIndex ] = wordIndex;
|
|
|
|
m_array[ wordIndex++ ] = m_endOfSentence;
|
|
|
|
m_sentenceLength[ sentenceId++ ] = words.size();
|
|
|
|
}
|
|
|
|
textFile.close();
|
|
|
|
cerr << "done reading " << wordIndex << " words, " << sentenceId << " sentences." << endl;
|
|
|
|
// List(0,9);
|
|
|
|
|
|
|
|
// sort
|
|
|
|
m_buffer = (INDEX*) calloc( sizeof( INDEX ), m_size );
|
|
|
|
Sort( 0, m_size-1 );
|
|
|
|
free( m_buffer );
|
|
|
|
cerr << "done sorting" << endl;
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
// good ol' quick sort
|
2011-02-24 16:57:11 +03:00
|
|
|
void SuffixArray::Sort(INDEX start, INDEX end)
|
|
|
|
{
|
|
|
|
if (start == end) return;
|
|
|
|
INDEX mid = (start+end+1)/2;
|
|
|
|
Sort( start, mid-1 );
|
|
|
|
Sort( mid, end );
|
|
|
|
|
|
|
|
// merge
|
|
|
|
int i = start;
|
|
|
|
int j = mid;
|
|
|
|
int k = 0;
|
|
|
|
int length = end-start+1;
|
|
|
|
while( k<length ) {
|
|
|
|
if (i == mid ) {
|
|
|
|
m_buffer[ k++ ] = m_index[ j++ ];
|
|
|
|
} else if (j > end ) {
|
|
|
|
m_buffer[ k++ ] = m_index[ i++ ];
|
|
|
|
} else {
|
|
|
|
if (CompareIndex( m_index[i], m_index[j] ) < 0) {
|
|
|
|
m_buffer[ k++ ] = m_index[ i++ ];
|
|
|
|
} else {
|
|
|
|
m_buffer[ k++ ] = m_index[ j++ ];
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
memcpy( ((char*)m_index) + sizeof( INDEX ) * start,
|
|
|
|
((char*)m_buffer), sizeof( INDEX ) * (end-start+1) );
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
SuffixArray::~SuffixArray()
|
2011-02-24 16:57:11 +03:00
|
|
|
{
|
|
|
|
free(m_index);
|
|
|
|
free(m_array);
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
int SuffixArray::CompareIndex( INDEX a, INDEX b ) const
|
|
|
|
{
|
2011-02-24 16:57:11 +03:00
|
|
|
// skip over identical words
|
|
|
|
INDEX offset = 0;
|
|
|
|
while( a+offset < m_size &&
|
|
|
|
b+offset < m_size &&
|
|
|
|
m_array[ a+offset ] == m_array[ b+offset ] ) {
|
|
|
|
offset++;
|
|
|
|
}
|
|
|
|
|
|
|
|
if( a+offset == m_size ) return -1;
|
|
|
|
if( b+offset == m_size ) return 1;
|
|
|
|
return CompareWord( m_array[ a+offset ], m_array[ b+offset ] );
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
inline int SuffixArray::CompareWord( WORD_ID a, WORD_ID b ) const
|
|
|
|
{
|
2011-02-24 16:57:11 +03:00
|
|
|
// cerr << "c(" << m_vcb.GetWord(a) << ":" << m_vcb.GetWord(b) << ")=" << m_vcb.GetWord(a).compare( m_vcb.GetWord(b) ) << endl;
|
|
|
|
return m_vcb.GetWord(a).compare( m_vcb.GetWord(b) );
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
int SuffixArray::Count( const vector< WORD > &phrase )
|
|
|
|
{
|
2011-02-24 16:57:11 +03:00
|
|
|
INDEX dummy;
|
|
|
|
return LimitedCount( phrase, m_size, dummy, dummy, 0, m_size-1 );
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
bool SuffixArray::MinCount( const vector< WORD > &phrase, INDEX min )
|
|
|
|
{
|
2011-02-24 16:57:11 +03:00
|
|
|
INDEX dummy;
|
|
|
|
return LimitedCount( phrase, min, dummy, dummy, 0, m_size-1 ) >= min;
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
bool SuffixArray::Exists( const vector< WORD > &phrase )
|
|
|
|
{
|
2011-02-24 16:57:11 +03:00
|
|
|
INDEX dummy;
|
|
|
|
return LimitedCount( phrase, 1, dummy, dummy, 0, m_size-1 ) == 1;
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
int SuffixArray::FindMatches( const vector< WORD > &phrase, INDEX &firstMatch, INDEX &lastMatch, INDEX search_start, INDEX search_end )
|
|
|
|
{
|
2011-02-24 16:57:11 +03:00
|
|
|
return LimitedCount( phrase, m_size, firstMatch, lastMatch, search_start, search_end );
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
int SuffixArray::LimitedCount( const vector< WORD > &phrase, INDEX min, INDEX &firstMatch, INDEX &lastMatch, INDEX search_start, INDEX search_end )
|
|
|
|
{
|
2011-02-24 16:57:11 +03:00
|
|
|
// cerr << "FindFirst\n";
|
|
|
|
INDEX start = search_start;
|
|
|
|
INDEX end = (search_end == -1) ? (m_size-1) : search_end;
|
|
|
|
INDEX mid = FindFirst( phrase, start, end );
|
|
|
|
// cerr << "done\n";
|
|
|
|
if (mid == m_size) return 0; // no matches
|
|
|
|
if (min == 1) return 1; // only existance check
|
2010-10-21 13:49:27 +04:00
|
|
|
|
2011-02-24 16:57:11 +03:00
|
|
|
int matchCount = 1;
|
2010-10-21 13:49:27 +04:00
|
|
|
|
2011-02-24 16:57:11 +03:00
|
|
|
//cerr << "before...\n";
|
|
|
|
firstMatch = FindLast( phrase, mid, start, -1 );
|
|
|
|
matchCount += mid - firstMatch;
|
2010-10-21 13:49:27 +04:00
|
|
|
|
2011-02-24 16:57:11 +03:00
|
|
|
//cerr << "after...\n";
|
|
|
|
lastMatch = FindLast( phrase, mid, end, 1 );
|
|
|
|
matchCount += lastMatch - mid;
|
2010-10-21 13:49:27 +04:00
|
|
|
|
2011-02-24 16:57:11 +03:00
|
|
|
return matchCount;
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
SuffixArray::INDEX SuffixArray::FindLast( const vector< WORD > &phrase, INDEX start, INDEX end, int direction )
|
|
|
|
{
|
2011-02-24 16:57:11 +03:00
|
|
|
end += direction;
|
|
|
|
while(true) {
|
|
|
|
INDEX mid = ( start + end + (direction>0 ? 0 : 1) )/2;
|
|
|
|
|
|
|
|
int match = Match( phrase, mid );
|
|
|
|
int matchNext = Match( phrase, mid+direction );
|
|
|
|
//cerr << "\t" << start << ";" << mid << ";" << end << " -> " << match << "," << matchNext << endl;
|
|
|
|
|
|
|
|
if (match == 0 && matchNext != 0) return mid;
|
|
|
|
|
|
|
|
if (match == 0) // mid point is a match
|
|
|
|
start = mid;
|
|
|
|
else
|
|
|
|
end = mid;
|
|
|
|
}
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
SuffixArray::INDEX SuffixArray::FindFirst( const vector< WORD > &phrase, INDEX &start, INDEX &end )
|
|
|
|
{
|
2011-02-24 16:57:11 +03:00
|
|
|
while(true) {
|
|
|
|
INDEX mid = ( start + end + 1 )/2;
|
|
|
|
//cerr << "FindFirst(" << start << ";" << mid << ";" << end << ")\n";
|
|
|
|
int match = Match( phrase, mid );
|
|
|
|
|
|
|
|
if (match == 0) return mid;
|
|
|
|
if (start >= end && match != 0 ) return m_size;
|
|
|
|
|
|
|
|
if (match > 0)
|
|
|
|
start = mid+1;
|
|
|
|
else
|
|
|
|
end = mid-1;
|
|
|
|
}
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
int SuffixArray::Match( const vector< WORD > &phrase, INDEX index )
|
|
|
|
{
|
2011-02-24 16:57:11 +03:00
|
|
|
INDEX pos = m_index[ index ];
|
|
|
|
for(INDEX i=0; i<phrase.size() && i+pos<m_size; i++) {
|
|
|
|
int match = CompareWord( m_vcb.GetWordID( phrase[i] ), m_array[ pos+i ] );
|
|
|
|
// cerr << "{" << index << "+" << i << "," << pos+i << ":" << match << "}" << endl;
|
|
|
|
if (match != 0)
|
|
|
|
return match;
|
|
|
|
}
|
|
|
|
return 0;
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
void SuffixArray::List(INDEX start, INDEX end)
|
|
|
|
{
|
2011-02-24 16:57:11 +03:00
|
|
|
for(INDEX i=start; i<=end; i++) {
|
|
|
|
INDEX pos = m_index[ i ];
|
|
|
|
// cerr << i << ":" << pos << "\t";
|
|
|
|
for(int j=0; j<5 && j+pos<m_size; j++) {
|
|
|
|
cout << " " << m_vcb.GetWord( m_array[ pos+j ] );
|
|
|
|
}
|
|
|
|
// cerr << "\n";
|
|
|
|
}
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
2011-02-24 16:57:11 +03:00
|
|
|
void SuffixArray::Save( string fileName )
|
|
|
|
{
|
|
|
|
FILE *pFile = fopen ( fileName.c_str() , "w" );
|
|
|
|
|
|
|
|
fwrite( &m_size, sizeof(INDEX), 1, pFile );
|
|
|
|
fwrite( m_array, sizeof(WORD_ID), m_size, pFile ); // corpus
|
|
|
|
fwrite( m_index, sizeof(INDEX), m_size, pFile ); // suffix array
|
|
|
|
fwrite( m_wordInSentence, sizeof(char), m_size, pFile); // word index
|
|
|
|
fwrite( m_sentence, sizeof(INDEX), m_size, pFile); // sentence index
|
|
|
|
|
|
|
|
fwrite( &m_sentenceCount, sizeof(INDEX), 1, pFile );
|
|
|
|
fwrite( m_sentenceLength, sizeof(char), m_sentenceCount, pFile); // sentence length
|
|
|
|
fclose( pFile );
|
|
|
|
|
|
|
|
m_vcb.Save( fileName + ".src-vcb" );
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
2011-02-24 16:57:11 +03:00
|
|
|
void SuffixArray::Load( string fileName )
|
|
|
|
{
|
|
|
|
FILE *pFile = fopen ( fileName.c_str() , "r" );
|
|
|
|
cerr << "loading from " << fileName << endl;
|
|
|
|
|
|
|
|
fread( &m_size, sizeof(INDEX), 1, pFile );
|
|
|
|
cerr << "words in corpus: " << m_size << endl;
|
|
|
|
m_array = (WORD_ID*) calloc( sizeof( WORD_ID ), m_size );
|
|
|
|
m_index = (INDEX*) calloc( sizeof( INDEX ), m_size );
|
|
|
|
m_wordInSentence = (char*) calloc( sizeof( char ), m_size );
|
|
|
|
m_sentence = (INDEX*) calloc( sizeof( INDEX ), m_size );
|
|
|
|
|
|
|
|
fread( m_array, sizeof(WORD_ID), m_size, pFile ); // corpus
|
|
|
|
fread( m_index, sizeof(INDEX), m_size, pFile ); // suffix array
|
|
|
|
fread( m_wordInSentence, sizeof(char), m_size, pFile); // word index
|
|
|
|
fread( m_sentence, sizeof(INDEX), m_size, pFile); // sentence index
|
|
|
|
|
|
|
|
fread( &m_sentenceCount, sizeof(INDEX), 1, pFile );
|
|
|
|
cerr << "sentences in corpus: " << m_sentenceCount << endl;
|
|
|
|
m_sentenceLength = (char*) calloc( sizeof( char ), m_sentenceCount );
|
|
|
|
fread( m_sentenceLength, sizeof(char), m_sentenceCount, pFile); // sentence length
|
|
|
|
fclose( pFile );
|
|
|
|
|
|
|
|
m_vcb.Load( fileName + ".src-vcb" );
|
2010-10-21 13:49:27 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
|