65 lines
2.1 KiB
C++
65 lines
2.1 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD 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.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef STRING_BASE_H
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#define STRING_BASE_H
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#include "string_type.h"
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/** Class for iterating over different kind of parts of a string. */
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class StringIterator {
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public:
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/** Type of the iterator. */
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enum IterType {
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ITER_CHARACTER, ///< Iterate over characters (or more exactly grapheme clusters).
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ITER_WORD, ///< Iterate over words.
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};
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/** Sentinel to indicate end-of-iteration. */
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static const size_t END = SIZE_MAX;
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/**
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* Create a new iterator instance.
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* @return New iterator instance.
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*/
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static StringIterator *Create();
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virtual ~StringIterator() {}
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/**
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* Set a new iteration string. Must also be called if the string contents
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* changed. The cursor is reset to the start of the string.
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* @param s New string.
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*/
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virtual void SetString(const char *s) = 0;
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/**
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* Change the current string cursor.
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* @param pos New cursor position.
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* @return Actual new cursor position at the next valid character boundary.
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* @pre pos has to be inside the current string.
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*/
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virtual size_t SetCurPosition(size_t pos) = 0;
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/**
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* Advance the cursor by one iteration unit.
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* @return New cursor position (in bytes) or #END if the cursor is already at the end of the string.
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*/
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virtual size_t Next(IterType what = ITER_CHARACTER) = 0;
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/**
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* Move the cursor back by one iteration unit.
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* @return New cursor position (in bytes) or #END if the cursor is already at the start of the string.
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*/
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virtual size_t Prev(IterType what = ITER_CHARACTER) = 0;
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protected:
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StringIterator() {}
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};
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#endif /* STRING_BASE_H */
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