parser.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/>.
 *
 */

/*
 * This code is based on original Hugo Trilogy source code
 *
 * Copyright (c) 1989-1995 David P. Gray
 *
 */

#ifndef HUGO_PARSER_H
#define HUGO_PARSER_H

namespace Common {
struct Event;
class ReadStream;
}

namespace Hugo {

enum seqTextParser {
    kTBExit  = 0, kTBMaze,    kTBNoPoint, kTBNoun,       kTBVerb,
    kTBEh,        kTBUnusual, kTBHave,    kTBNoUse,      kTBDontHave,
    kTBNeed,      kTBOk,      kCmtAny1,   kCmtAny2,      kCmtAny3,
    kCmtClose,    kTBIntro,   kTBOutro,   kTBUnusual_1d, kCmtAny4,
    kCmtAny5,     kTBExit_1d, kTBEh_1d,   kTBEh_2d,      kTBNoUse_2d
};

struct cmd {
    uint16 _verbIndex;                               // the verb
    uint16 _reqIndex;                                // ptr to list of required objects
    uint16 _textDataNoCarryIndex;                    // ptr to string if any of above not carried
    byte   _reqState;                                // required state for verb to be done
    byte   _newState;                                // new states if verb done
    uint16 _textDataWrongIndex;                      // ptr to string if wrong state
    uint16 _textDataDoneIndex;                       // ptr to string if verb done
    uint16 _actIndex;                                // Ptr to action list if verb done
};

struct Background {
    uint16 _verbIndex;
    uint16 _nounIndex;
    int    _commentIndex;                            // Index of comment produced on match
    bool   _matchFl;                                 // TRUE if noun must match when present
    byte   _roomState;                               // "State" of room. Comments might differ.
    byte   _bonusIndex;                              // Index of bonus score (0 = no bonus)
};

typedef Background *ObjectList;

class Parser {
public:
    Parser(HugoEngine *vm);
    virtual ~Parser();

    bool isWordPresent(char **wordArr) const;

    uint16 getCmdDefaultVerbIdx(const uint16 index) const;

    void charHandler();
    void command(const char *format, ...);
    void freeParser();
    void keyHandler(Common::Event event);
    void actionHandler(Common::Event event);
    void loadArrayReqs(Common::SeekableReadStream &in);
    void loadBackgroundObjects(Common::ReadStream &in);
    void loadCatchallList(Common::ReadStream &in);
    void loadCmdList(Common::ReadStream &in);
    void switchTurbo();
    const char *useBG(const char *name);

    virtual void lineHandler() = 0;
    virtual void showInventory() const = 0;
    virtual void takeObject(Object *obj) = 0;

protected:
    HugoEngine *_vm;

    int16     _cmdLineIndex;                        // Index into line
    uint32    _cmdLineTick;                         // For flashing cursor
    char      _cmdLineCursor;
    Command   _cmdLine;                             // Build command line
    uint16    _backgroundObjectsSize;
    uint16    _cmdListSize;

    uint16       **_arrayReqs;
    Background **_backgroundObjects;
    Background  *_catchallList;
    cmd          **_cmdList;

    const char *findNoun() const;
    const char *findVerb() const;
    void  readBG(Common::ReadStream &in, Background &curBG);
    void  readCmd(Common::ReadStream &in, cmd &curCmd);
    void  showDosInventory() const;

    bool   _checkDoubleF1Fl;                        // Flag used to display user help or instructions
    uint16 _getIndex;                               // Index into ring buffer
    uint16 _putIndex;
    char   _ringBuffer[32];                         // Ring buffer

private:
    static const int kBlinksPerSec = 2;             // Cursor blinks per second
};

class Parser_v1d : public Parser {
public:
    Parser_v1d(HugoEngine *vm);
    ~Parser_v1d() override;

    void lineHandler() override;
    void showInventory() const override;
    void takeObject(Object *obj) override;

protected:
    virtual void dropObject(Object *obj);

    const char *findNextNoun(const char *noun) const;
    bool  isBackgroundWord_v1(const char *noun, const char *verb, ObjectList obj) const;
    bool  isCatchallVerb_v1(bool testNounFl, const char *noun, const char *verb, ObjectList obj) const;
    bool  isGenericVerb_v1(const char *word, Object *obj);
    bool  isNear_v1(const char *verb, const char *noun, Object *obj, char *comment) const;
    bool  isObjectVerb_v1(const char *word, Object *obj);
};

class Parser_v2d : public Parser_v1d {
public:
    Parser_v2d(HugoEngine *vm);
    ~Parser_v2d() override;

    void lineHandler() override;
};

class Parser_v3d : public Parser_v1d {
public:
    Parser_v3d(HugoEngine *vm);
    ~Parser_v3d() override;

    void lineHandler() override;
protected:
    void  dropObject(Object *obj) override;
    bool  isBackgroundWord_v3(ObjectList obj) const;
    bool  isCatchallVerb_v3(ObjectList obj) const;
    bool  isGenericVerb_v3(Object *obj, char *comment);
    bool  isNear_v3(Object *obj, const char *verb, char *comment) const;
    bool  isObjectVerb_v3(Object *obj, char *comment);
    void  takeObject(Object *obj) override;
};

class Parser_v1w : public Parser_v3d {
public:
    Parser_v1w(HugoEngine *vm);
    ~Parser_v1w() override;

    void showInventory() const override;

    void  lineHandler() override;
};

} // End of namespace Hugo

#endif //HUGO_PARSER_H