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#include "grammar_extractor.h"
#include <iterator>
#include <sstream>
#include <vector>
#include <unordered_set>
#include "grammar.h"
#include "rule.h"
#include "rule_factory.h"
#include "vocabulary.h"
#include "data_array.h"
using namespace std;
namespace extractor {
GrammarExtractor::GrammarExtractor(
shared_ptr<SuffixArray> source_suffix_array,
shared_ptr<DataArray> target_data_array,
shared_ptr<Alignment> alignment, shared_ptr<Precomputation> precomputation,
shared_ptr<Scorer> scorer, int min_gap_size, int max_rule_span,
int max_nonterminals, int max_rule_symbols, int max_samples,
bool require_tight_phrases) :
vocabulary(make_shared<Vocabulary>()),
rule_factory(make_shared<HieroCachingRuleFactory>(
source_suffix_array, target_data_array, alignment, vocabulary,
precomputation, scorer, min_gap_size, max_rule_span, max_nonterminals,
max_rule_symbols, max_samples, require_tight_phrases)) {}
GrammarExtractor::GrammarExtractor(
shared_ptr<Vocabulary> vocabulary,
shared_ptr<HieroCachingRuleFactory> rule_factory) :
vocabulary(vocabulary),
rule_factory(rule_factory) {}
Grammar GrammarExtractor::GetGrammar(const string& sentence, const unordered_set<int>& blacklisted_sentence_ids, const shared_ptr<DataArray> source_data_array) {
vector<string> words = TokenizeSentence(sentence);
vector<int> word_ids = AnnotateWords(words);
return rule_factory->GetGrammar(word_ids, blacklisted_sentence_ids, source_data_array);
}
vector<string> GrammarExtractor::TokenizeSentence(const string& sentence) {
vector<string> result;
result.push_back("<s>");
istringstream buffer(sentence);
copy(istream_iterator<string>(buffer),
istream_iterator<string>(),
back_inserter(result));
result.push_back("</s>");
return result;
}
vector<int> GrammarExtractor::AnnotateWords(const vector<string>& words) {
vector<int> result;
for (string word: words) {
result.push_back(vocabulary->GetTerminalIndex(word));
}
return result;
}
} // namespace extractor
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