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/* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef GLK_ALAN2_PARSE
#define GLK_ALAN2_PARSE
namespace Glk {
namespace Alan2 {
#define LISTLEN 100
class Parser {
public:
Parser();
/**
* Parse a new player command
*/
void parse();
private:
void unknown(char *inputStr);
int lookup(char *wrd);
char *gettoken(char *tokenBuffer);
void agetline();
void scan();
/**
* Search for a non-verb command
*/
void nonverb();
Abool objhere(Aword obj);
Aword acthere(Aword act);
Abool isHere(Aword id);
/**
* Build a list of objects matching 'all'
*/
void buildall(ParamElem list[]);
void listCopy(ParamElem a[], ParamElem b[]);
bool listContains(ParamElem l[], Aword e);
void listIntersection(ParamElem a[], ParamElem b[]);
/**
* Copy the refs (in dictionary) to a paramList
*/
void listCopyFromDictionary(ParamElem p[], Aword r[]);
int listLength(ParamElem a[]);
/**
* Compact a list, i.e remove any NULL elements
*/
void listCompact(ParamElem a[]);
/**
* Merge the paramElems of one list into the first
*/
void listMerge(ParamElem a[], ParamElem b[]);
/**
* Subtract two lists
*/
void listSubtract(ParamElem a[], ParamElem b[]);
/**
* Match an unambigous object reference
*/
void unambig(ParamElem plst[]);
/**
* Match a simple verb command
*/
void simple(ParamElem olst[]);
/**
* Match a complex verb command
*/
void complex(ParamElem olst[]);
bool claCheck(ClaElem *cla);
/**
* In case the syntax did not indicate omnipotent powers (allowed
* access to remote object), we need to remove non - present parameters
*/
void resolve(ParamElem plst[]);
bool endOfTable(StxElem *addr);
bool endOfTable(ElmElem *addr);
bool endOfTable(ClaElem *addr);
bool endOfTable(VrbElem *addr);
bool endOfTable(AltElem *addr);
bool endOfTable(ChkElem *addr);
/**
* Find the verb alternative wanted in a verb list and return
* the address to it.
*
* @param vrbsadr Address to start of list
* @param param Which parameter to match
*/
AltElem *findalt(Aword vrbsadr, Aword param);
/**
* Tries a check, returns TRUE if it passed, FALSE otherwise
*
* @param adr ACODE address to check table
* @param act Act if it fails?
*/
bool trycheck(Aaddr adr, bool act);
/**
* Check if current action is possible according to the CHECKs.
*/
bool possible();
void tryMatch(ParamElem mlst[]);
void match(ParamElem *mlst);
/**
* Execute all activities commanded. Handles possible multiple actions
* such as THEM or lists of objects.
*/
void action(ParamElem plst[]);
// TODO: Initialize / move these
int wrds[LISTLEN / 2]; // List of parsed words
int wrdidx; // and an index into it
bool plural;
// Syntax Parameters
int paramidx; // Index in params
ParamElem *params; // List of params
static ParamElem *pparams; // Previous parameter list
static ParamElem *mlst; // Multiple objects list
static ParamElem *pmlst; // Previous multiple list
StxElem *stxs; // Syntax table pointer
LocElem *locs; // Location table pointer
// Literals
LitElem litValues[MAXPARAMS + 1];
// What did the user say?
int vrbwrd; // The word he used
int vrbcode; // The code for that verb
bool eol; // Looking at End of line? Yes, initially
char *token;
WrdElem *dict; // Dictionary pointer
int dictsize;
int allLength; // No. of objects matching 'all'
};
} // End of namespace Alan2
} // End of namespace Glk
#endif
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