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/**
* Copyright (C) 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include <string>
#include "mongo/db/fts/fts_query_parser.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/stringutils.h"
namespace mongo {
namespace fts {
FTSQueryParser::FTSQueryParser( StringData str )
: _pos(0), _raw( str ) {
skipWhitespace();
_previousWhiteSpace = true;
}
bool FTSQueryParser::more() const {
return _pos < _raw.size();
}
QueryToken FTSQueryParser::next() {
if ( _pos >= _raw.size() )
return QueryToken( QueryToken::INVALID, "", 0, false );
unsigned start = _pos++;
QueryToken::Type type = getType( _raw[start] );
// Query Parser should never land on whitespace
if ( type == QueryToken::WHITESPACE ) {
invariant( false );
}
if ( type == QueryToken::TEXT ) {
while ( _pos < _raw.size() && getType( _raw[_pos] ) == type ) {
_pos++;
}
}
StringData ret = _raw.substr( start, _pos - start );
bool old = _previousWhiteSpace;
_previousWhiteSpace = skipWhitespace();
return QueryToken( type, ret, start, old );
}
bool FTSQueryParser::skipWhitespace() {
unsigned start = _pos;
while ( _pos < _raw.size() && getType( _raw[_pos] ) == QueryToken::WHITESPACE ) {
_pos++;
}
return _pos > start;
}
QueryToken::Type FTSQueryParser::getType( char c ) const {
switch ( c ) {
// Unicode TR29 defines these as Word Boundaries
case '\n': // U+000A - LF
case '\v': // U+000B - Veritical Tab
case '\f': // U+000C - Form Feed
case '\r': // U+000D - CR
// Unicode TR29 remarks this could be used MidNum for Word Boundaries
// but we treat this as a token separator
case ' ': // U+0020 - Space
return QueryToken::WHITESPACE;
// Unicode TR29 has a particular note about the complexity of hyphens.
// Since we use them for negation, we are sensitive to them, and we simply drop
// them otherwise from words
case '-':
case '"':
return QueryToken::DELIMITER;
default:
return QueryToken::TEXT;
}
}
}
}
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