UI_TextParser.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef QDENGINE_SYSTEM_GRAPHICS_UI_TEXT_PARSER_H
#define QDENGINE_SYSTEM_GRAPHICS_UI_TEXT_PARSER_H


#include "qdengine/system/graphics/gr_font.h"


namespace QDEngine {

struct OutNode {
    enum {
        NEW_LINE,
        TEXT,
        COLOR
    } type;
    int width;
    union {
        struct {
            const char *begin;
            const char *end;
        } nl;
        struct {
            int style;
        } t;
        int color;
    };
    OutNode() : type(NEW_LINE), width(0) { nl.begin = 0; nl.end = 0; }
    OutNode(const char *b, const char *e, int wd) : type(TEXT), width(wd) { nl.begin = b; nl.end = e; }
    OutNode(int clr) : type(COLOR), width(0), color(clr) {}
};

typedef Std::vector<OutNode> OutNodes;

class UI_TextParser {
public:
    UI_TextParser(const grFont *font = 0);
    UI_TextParser(const UI_TextParser &src);

    void operator= (const UI_TextParser &src);

    void setFont(const grFont *font);

    void parseString(const char *text, int color = 0, int fitIn = -1);

    const OutNodes &outNodes() const {
        return _outNodes;
    }

    int fontHeight() const {
        return _font ? _font->size_y() : 1;
    }
    const Vect2i &size() const {
        return _size;
    }

    int lineCount() const {
        return _lineCount;
    }
    OutNodes::const_iterator getLineBegin(int lineNum) const;

private:
    void init();

    inline int fromHex(char a) {
        if (a >= '0' && a <= '9')
            return a - '0';
        if (a >= 'A' && a <= 'F')
            return a - 'A' + 10;
        if (a >= 'a' && a <= 'f')
            return a - 'a' + 10;
        return -1;
    }

    inline void addChar(byte cc) {
        int width = _font->char_width(cc);
        if (testWidth(width) || cc != ' ')
            _tagWidth += width;
        ++_pstr;
    }

    inline void skipNode() {
        _lineBegin = _pstr;
        _lastSpace = _lineBegin;
        _lastTagWidth = 0;
        _tagWidth = 0;
    }

    inline void putNode(OutNode &node) {
        _outNodes.push_back(node);
        skipNode();
    }

    void putText() {
        if (_pstr == _lineBegin)
            return;
        _lineWidth += _tagWidth;
        OutNode node(_lineBegin, _pstr, _tagWidth);
        putNode(node);
    }

    void endLine() {
        _size.x = MAX(_size.x, _lineWidth);

        _outNodes[_prevLineIndex].width = _lineWidth;
        _lineWidth = 0;

        _outNodes.push_back(OutNode());
        _prevLineIndex = _outNodes.size() - 1;

        ++_lineCount;
    }

    void getColor(int defColor);
    int getStyle(const char *styleptr, const char *end);
    int getToken();
    bool testWidth(int width);

    OutNodes _outNodes;

    int _prevLineIndex;
    const char *_lastSpace;
    int _lastTagWidth;

    const char *_lineBegin;
    const char *_pstr;
    int _tagWidth;
    int _lineWidth;

    int _fitIn;

    Vect2i _size;
    int _lineCount;

    const grFont *_font;

};

} // namespace QDEngine

#endif // QDENGINE_SYSTEM_GRAPHICS_UI_TEXT_PARSER_H