mirror of
https://github.com/libretro/scummvm.git
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140 lines
3.7 KiB
C++
140 lines
3.7 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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/*
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* This code is based on original Tony Tough source code
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*
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* Copyright (c) 1997-2003 Nayma Software
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*/
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#ifndef MPAL_EXPR_H
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#define MPAL_EXPR_H
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#include "tony/mpal/memory.h"
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namespace Tony {
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namespace MPAL {
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/**
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* @defgroup Mathamatical operations
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*/
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//@{
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#define OP_MUL ((1 << 4) | 0)
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#define OP_DIV ((1 << 4) | 1)
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#define OP_MODULE ((1 << 4) | 2)
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#define OP_ADD ((2 << 4) | 0)
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#define OP_SUB ((2 << 4) | 1)
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#define OP_SHL ((3 << 4) | 0)
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#define OP_SHR ((3 << 4) | 1)
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#define OP_MINOR ((4 << 4) | 0)
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#define OP_MAJOR ((4 << 4) | 1)
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#define OP_MINEQ ((4 << 4) | 2)
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#define OP_MAJEQ ((4 << 4) | 3)
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#define OP_EQUAL ((5 << 4) | 0)
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#define OP_NOEQUAL ((5 << 4) | 1)
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#define OP_BITAND ((6 << 4) | 0)
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#define OP_BITXOR ((7 << 4) | 0)
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#define OP_BITOR ((8 << 4) | 0)
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#define OP_AND ((9 << 4) | 0)
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#define OP_OR ((10 << 4) | 0)
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//@}
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/**
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* @defgroup Structures
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*/
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//@{
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/**
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* Mathamatical framework to manage operations
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*/
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typedef struct {
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byte _type; // Object Type (see enum ExprListTypes)
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union {
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int _num; // Identifier (if type == ELT_NUMBER)
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char *_name; // Variable name (if type == ELT_VAR)
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MpalHandle _son; // Handle expressions (if type == ELT_PARENTH)
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byte *_pson; // Handle lockato (if type == ELT_PARENTH2)
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} _val;
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byte _symbol; // Mathematic symbols (see #define OP_*)
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} Expression;
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typedef Expression *LpExpression;
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//@}
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/**
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* Object types that can be contained in an EXPRESSION structure
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*/
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enum ExprListTypes {
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ELT_NUMBER = 1,
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ELT_VAR = 2,
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ELT_PARENTH = 3,
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ELT_PARENTH2 = 4
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};
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/****************************************************************************\
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* Function Prototypes
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\****************************************************************************/
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/**
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* Parses a mathematical expression from the MPC file
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*
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* @param buf Buffer containing the expression to evaluate
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* @param h Pointer to a handle that, at the end of execution,
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* will point to the area of memory containing the parsed expression
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* @returns Pointer to the buffer immediately after the expression, or NULL if error.
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*/
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const byte *parseExpression(const byte *lpBuf, MpalHandle *h);
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/**
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* Calculate the value of a mathamatical expression
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*
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* @param h Handle to the expression
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* @returns Numeric value
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*/
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int evaluateExpression(MpalHandle h);
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/**
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* Compare two mathematical expressions together
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*
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* @param h1 Expression to be compared
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* @param h2 Expression to be compared
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*/
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bool compareExpressions(MpalHandle h1, MpalHandle h2);
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/**
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* Frees an expression that was previously parsed
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*
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* @param h Handle for the expression
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*/
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void freeExpression(MpalHandle h);
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} // end of namespace MPAL
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} // end of namespace Tony
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#endif
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