diff options
Diffstat (limited to 'lm/filter/wrapper.hh')
-rw-r--r-- | lm/filter/wrapper.hh | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/lm/filter/wrapper.hh b/lm/filter/wrapper.hh index 90b07a08f..eb6575010 100644 --- a/lm/filter/wrapper.hh +++ b/lm/filter/wrapper.hh @@ -39,17 +39,15 @@ template <class FilterT> class ContextFilter { explicit ContextFilter(Filter &backend) : backend_(backend) {} template <class Output> void AddNGram(const StringPiece &ngram, const StringPiece &line, Output &output) { - pieces_.clear(); - // TODO: this copy could be avoided by a lookahead iterator. - std::copy(util::TokenIter<util::SingleCharacter, true>(ngram, ' '), util::TokenIter<util::SingleCharacter, true>::end(), std::back_insert_iterator<std::vector<StringPiece> >(pieces_)); - backend_.AddNGram(pieces_.begin(), pieces_.end() - !pieces_.empty(), line, output); + // Find beginning of string or last space. + const char *last_space; + for (last_space = ngram.data() + ngram.size() - 1; last_space > ngram.data() && *last_space != ' '; --last_space) {} + backend_.AddNGram(StringPiece(ngram.data(), last_space - ngram.data()), line, output); } void Flush() const {} private: - std::vector<StringPiece> pieces_; - Filter backend_; }; |