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104 lines
3.4 KiB
C++
104 lines
3.4 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "common/tokenizer.h"
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namespace Common {
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StringTokenizer::StringTokenizer(const String &str, const String &delimiters) : _str(str), _delimiters(delimiters) {
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reset();
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}
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void StringTokenizer::reset() {
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_tokenBegin = _tokenEnd = 0;
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}
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bool StringTokenizer::empty() const {
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// Search for the next token's start (i.e. the next non-delimiter character)
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for (uint i = _tokenEnd; i < _str.size(); i++) {
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if (!_delimiters.contains(_str[i]))
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return false; // Found a token so the tokenizer is not empty
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}
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// Didn't find any more tokens so the tokenizer is empty
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return true;
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}
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String StringTokenizer::nextToken() {
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// Seek to next token's start (i.e. jump over the delimiters before next token)
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for (_tokenBegin = _tokenEnd; _tokenBegin < _str.size() && _delimiters.contains(_str[_tokenBegin]); _tokenBegin++)
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;
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// Seek to the token's end (i.e. jump over the non-delimiters)
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for (_tokenEnd = _tokenBegin; _tokenEnd < _str.size() && !_delimiters.contains(_str[_tokenEnd]); _tokenEnd++)
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;
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// Return the found token
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return String(_str.c_str() + _tokenBegin, _tokenEnd - _tokenBegin);
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}
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U32StringTokenizer::U32StringTokenizer(const U32String &str, const String &delimiters) : _str(str), _delimiters(delimiters) {
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reset();
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}
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void U32StringTokenizer::reset() {
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_tokenBegin = _tokenEnd = _str.begin();
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}
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bool U32StringTokenizer::empty() const {
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// Search for the next token's start (i.e. the next non-delimiter character)
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for (U32String::const_iterator itr = _tokenEnd; itr != _str.end(); itr++) {
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if (!_delimiters.contains(*itr)) {
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return false; // Found a token so the tokenizer is not empty
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}
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}
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// Didn't find any more tokens so the tokenizer is empty
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return true;
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}
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U32String U32StringTokenizer::nextToken() {
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// Skip delimiters when present at the beginning, to point to the next token
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// For example, the below loop will set _tokenBegin & _tokenEnd to 'H' for the string -> "!!--=Hello World"
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// And subsequently, skip all delimiters in the beginning of the next word.
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while (_tokenBegin != _str.end() && _delimiters.contains(*_tokenBegin)) {
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_tokenBegin++;
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_tokenEnd++;
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}
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// Loop and advance _tokenEnd until we find a delimiter at the end of a word/string
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while (_tokenBegin != _str.end() && _tokenEnd != _str.end()) {
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if (_delimiters.contains(*_tokenEnd)) {
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U32String token(_tokenBegin, _tokenEnd);
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_tokenEnd++;
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_tokenBegin = _tokenEnd;
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return token;
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}
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_tokenEnd++;
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}
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// Returning the last word if _tokenBegin iterator isn't at the end.
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if (_tokenBegin != _str.end())
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return U32String(_tokenBegin, _tokenEnd);
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else
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return U32String();
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}
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} // End of namespace Common
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