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#include "linear_merger.h"
#include <cmath>
#include "data_array.h"
#include "matching.h"
#include "matching_comparator.h"
#include "phrase.h"
#include "phrase_location.h"
#include "vocabulary.h"
LinearMerger::LinearMerger(shared_ptr<Vocabulary> vocabulary,
shared_ptr<DataArray> data_array,
shared_ptr<MatchingComparator> comparator) :
vocabulary(vocabulary), data_array(data_array), comparator(comparator) {}
LinearMerger::~LinearMerger() {}
void LinearMerger::Merge(
vector<int>& locations, const Phrase& phrase, const Phrase& suffix,
vector<int>::iterator prefix_start, vector<int>::iterator prefix_end,
vector<int>::iterator suffix_start, vector<int>::iterator suffix_end,
int prefix_subpatterns, int suffix_subpatterns) const {
int last_chunk_len = suffix.GetChunkLen(suffix.Arity());
bool offset = !vocabulary->IsTerminal(suffix.GetSymbol(0));
while (prefix_start != prefix_end) {
Matching left(prefix_start, prefix_subpatterns,
data_array->GetSentenceId(*prefix_start));
while (suffix_start != suffix_end) {
Matching right(suffix_start, suffix_subpatterns,
data_array->GetSentenceId(*suffix_start));
if (comparator->Compare(left, right, last_chunk_len, offset) > 0) {
suffix_start += suffix_subpatterns;
} else {
break;
}
}
int start_position = *prefix_start;
vector<int> :: iterator i = suffix_start;
while (prefix_start != prefix_end && *prefix_start == start_position) {
Matching left(prefix_start, prefix_subpatterns,
data_array->GetSentenceId(*prefix_start));
while (i != suffix_end) {
Matching right(i, suffix_subpatterns, data_array->GetSentenceId(*i));
int comparison = comparator->Compare(left, right, last_chunk_len,
offset);
if (comparison == 0) {
vector<int> merged = left.Merge(right, phrase.Arity() + 1);
locations.insert(locations.end(), merged.begin(), merged.end());
} else if (comparison < 0) {
break;
}
i += suffix_subpatterns;
}
prefix_start += prefix_subpatterns;
}
}
}
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