mirror of
https://github.com/ZDoom/gzdoom.git
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458 lines
12 KiB
C++
458 lines
12 KiB
C++
/*
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** thingdef_exp.cpp
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**
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** Expression parsing for DECORATE
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**
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**---------------------------------------------------------------------------
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** Copyright 2005 Jan Cholasta
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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** 4. When not used as part of ZDoom or a ZDoom derivative, this code will be
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** covered by the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or (at
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** your option) any later version.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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#include "actor.h"
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#include "sc_man.h"
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#include "tarray.h"
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#include "templates.h"
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#include "cmdlib.h"
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#include "i_system.h"
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#include "m_random.h"
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#include "a_pickups.h"
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#include "thingdef.h"
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#include "p_lnspec.h"
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#include "doomstat.h"
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#include "thingdef_exp.h"
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FRandom pr_exrandom ("EX_Random");
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//
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// ParseExpression
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// [GRB] Parses an expression and stores it into Expression array
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//
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static FxExpression *ParseExpressionM (FScanner &sc, const PClass *cls);
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static FxExpression *ParseExpressionL (FScanner &sc, const PClass *cls);
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static FxExpression *ParseExpressionK (FScanner &sc, const PClass *cls);
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static FxExpression *ParseExpressionJ (FScanner &sc, const PClass *cls);
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static FxExpression *ParseExpressionI (FScanner &sc, const PClass *cls);
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static FxExpression *ParseExpressionH (FScanner &sc, const PClass *cls);
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static FxExpression *ParseExpressionG (FScanner &sc, const PClass *cls);
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static FxExpression *ParseExpressionF (FScanner &sc, const PClass *cls);
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static FxExpression *ParseExpressionE (FScanner &sc, const PClass *cls);
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static FxExpression *ParseExpressionD (FScanner &sc, const PClass *cls);
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static FxExpression *ParseExpressionC (FScanner &sc, const PClass *cls);
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static FxExpression *ParseExpressionB (FScanner &sc, const PClass *cls);
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static FxExpression *ParseExpressionA (FScanner &sc, const PClass *cls);
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static FxExpression *ParseExpression0 (FScanner &sc, const PClass *cls);
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FxExpression *ParseExpression (FScanner &sc, PClass *cls)
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{
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FxExpression *data = ParseExpressionM (sc, cls);
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FCompileContext ctx;
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ctx.cls = cls;
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ctx.lax = true;
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data = data->Resolve(ctx);
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return data;
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}
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static FxExpression *ParseExpressionM (FScanner &sc, const PClass *cls)
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{
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FxExpression *condition = ParseExpressionL (sc, cls);
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if (sc.CheckToken('?'))
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{
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FxExpression *truex = ParseExpressionM (sc, cls);
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sc.MustGetToken(':');
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FxExpression *falsex = ParseExpressionM (sc, cls);
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return new FxConditional(condition, truex, falsex);
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}
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else
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{
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return condition;
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}
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}
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static FxExpression *ParseExpressionL (FScanner &sc, const PClass *cls)
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{
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FxExpression *tmp = ParseExpressionK (sc, cls);
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while (sc.CheckToken(TK_OrOr))
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{
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FxExpression *right = ParseExpressionK (sc, cls);
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tmp = new FxBinaryLogical(TK_OrOr, tmp, right);
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}
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return tmp;
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}
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static FxExpression *ParseExpressionK (FScanner &sc, const PClass *cls)
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{
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FxExpression *tmp = ParseExpressionJ (sc, cls);
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while (sc.CheckToken(TK_AndAnd))
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{
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FxExpression *right = ParseExpressionJ (sc, cls);
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tmp = new FxBinaryLogical(TK_AndAnd, tmp, right);
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}
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return tmp;
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}
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static FxExpression *ParseExpressionJ (FScanner &sc, const PClass *cls)
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{
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FxExpression *tmp = ParseExpressionI (sc, cls);
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while (sc.CheckToken('|'))
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{
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FxExpression *right = ParseExpressionI (sc, cls);
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tmp = new FxBinaryInt('|', tmp, right);
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}
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return tmp;
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}
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static FxExpression *ParseExpressionI (FScanner &sc, const PClass *cls)
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{
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FxExpression *tmp = ParseExpressionH (sc, cls);
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while (sc.CheckToken('^'))
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{
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FxExpression *right = ParseExpressionH (sc, cls);
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tmp = new FxBinaryInt('^', tmp, right);
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}
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return tmp;
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}
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static FxExpression *ParseExpressionH (FScanner &sc, const PClass *cls)
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{
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FxExpression *tmp = ParseExpressionG (sc, cls);
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while (sc.CheckToken('&'))
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{
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FxExpression *right = ParseExpressionG (sc, cls);
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tmp = new FxBinaryInt('&', tmp, right);
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}
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return tmp;
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}
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static FxExpression *ParseExpressionG (FScanner &sc, const PClass *cls)
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{
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FxExpression *tmp = ParseExpressionF (sc, cls);
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while (sc.GetToken() && (sc.TokenType == TK_Eq || sc.TokenType == TK_Neq))
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{
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int token = sc.TokenType;
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FxExpression *right = ParseExpressionF (sc, cls);
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tmp = new FxCompareEq(token, tmp, right);
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}
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if (!sc.End) sc.UnGet();
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return tmp;
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}
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static FxExpression *ParseExpressionF (FScanner &sc, const PClass *cls)
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{
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FxExpression *tmp = ParseExpressionE (sc, cls);
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while (sc.GetToken() && (sc.TokenType == '<' || sc.TokenType == '>' || sc.TokenType == TK_Leq || sc.TokenType == TK_Geq))
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{
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int token = sc.TokenType;
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FxExpression *right = ParseExpressionE (sc, cls);
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tmp = new FxCompareRel(token, tmp, right);
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}
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if (!sc.End) sc.UnGet();
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return tmp;
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}
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static FxExpression *ParseExpressionE (FScanner &sc, const PClass *cls)
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{
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FxExpression *tmp = ParseExpressionD (sc, cls);
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while (sc.GetToken() && (sc.TokenType == TK_LShift || sc.TokenType == TK_RShift || sc.TokenType == TK_URShift))
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{
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int token = sc.TokenType;
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FxExpression *right = ParseExpressionD (sc, cls);
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tmp = new FxBinaryInt(token, tmp, right);
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}
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if (!sc.End) sc.UnGet();
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return tmp;
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}
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static FxExpression *ParseExpressionD (FScanner &sc, const PClass *cls)
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{
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FxExpression *tmp = ParseExpressionC (sc, cls);
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while (sc.GetToken() && (sc.TokenType == '+' || sc.TokenType == '-'))
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{
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int token = sc.TokenType;
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FxExpression *right = ParseExpressionC (sc, cls);
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tmp = new FxAddSub(token, tmp, right);
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}
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if (!sc.End) sc.UnGet();
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return tmp;
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}
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static FxExpression *ParseExpressionC (FScanner &sc, const PClass *cls)
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{
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FxExpression *tmp = ParseExpressionB (sc, cls);
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while (sc.GetToken() && (sc.TokenType == '*' || sc.TokenType == '/' || sc.TokenType == '%'))
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{
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int token = sc.TokenType;
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FxExpression *right = ParseExpressionB (sc, cls);
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tmp = new FxMulDiv(token, tmp, right);
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}
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if (!sc.End) sc.UnGet();
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return tmp;
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}
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static FxExpression *ParseExpressionB (FScanner &sc, const PClass *cls)
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{
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sc.GetToken();
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switch(sc.TokenType)
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{
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case '~':
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return new FxUnaryNotBitwise(ParseExpressionA (sc, cls));
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case '!':
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return new FxUnaryNotBoolean(ParseExpressionA (sc, cls));
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case '-':
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return new FxMinusSign(ParseExpressionA (sc, cls));
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case '+':
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return new FxPlusSign(ParseExpressionA (sc, cls));
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default:
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sc.UnGet();
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return ParseExpressionA (sc, cls);
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}
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}
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//==========================================================================
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//
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// ParseExpressionB
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//
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//==========================================================================
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static FxExpression *ParseExpressionA (FScanner &sc, const PClass *cls)
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{
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FxExpression *base_expr = ParseExpression0 (sc, cls);
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while(1)
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{
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FScriptPosition pos(sc);
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#if 0
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if (sc.CheckToken('.'))
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{
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if (sc.CheckToken(TK_Default))
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{
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sc.MustGetToken('.');
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base_expr = new FxClassDefaults(base_expr, pos);
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}
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sc.MustGetToken(TK_Identifier);
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FName FieldName = sc.String;
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pos = sc;
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/* later!
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if (SC_CheckToken('('))
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{
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if (base_expr->IsDefaultObject())
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{
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SC_ScriptError("Cannot call methods for default.");
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}
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base_expr = ParseFunctionCall(base_expr, FieldName, false, false, pos);
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}
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else
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*/
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{
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base_expr = new FxDotIdentifier(base_expr, FieldName, pos);
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}
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}
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else
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#endif
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if (sc.CheckToken('['))
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{
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FxExpression *index = ParseExpressionM(sc, cls);
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sc.MustGetToken(']');
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base_expr = new FxArrayElement(base_expr, index);
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}
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else break;
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}
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return base_expr;
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}
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static FxExpression *ParseExpression0 (FScanner &sc, const PClass *cls)
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{
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FScriptPosition scpos(sc);
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if (sc.CheckToken('('))
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{
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FxExpression *data = ParseExpressionM (sc, cls);
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sc.MustGetToken(')');
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return data;
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}
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else if (sc.CheckToken(TK_True))
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{
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return new FxConstant(1, scpos);
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}
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else if (sc.CheckToken(TK_False))
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{
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return new FxConstant(0, scpos);
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}
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else if (sc.CheckToken(TK_IntConst))
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{
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return new FxConstant(sc.Number, scpos);
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}
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else if (sc.CheckToken(TK_FloatConst))
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{
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return new FxConstant(sc.Float, scpos);
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}
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else if (sc.CheckToken(TK_Random))
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{
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FRandom *rng;
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if (sc.CheckToken('['))
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{
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sc.MustGetToken(TK_Identifier);
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rng = FRandom::StaticFindRNG(sc.String);
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sc.MustGetToken(']');
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}
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else
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{
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rng = &pr_exrandom;
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}
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sc.MustGetToken('(');
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FxExpression *min = ParseExpressionM (sc, cls);
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sc.MustGetToken(',');
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FxExpression *max = ParseExpressionM (sc, cls);
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sc.MustGetToken(')');
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return new FxRandom(rng, min, max, sc);
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}
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else if (sc.CheckToken(TK_FRandom))
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{
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FRandom *rng;
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if (sc.CheckToken('['))
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{
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sc.MustGetToken(TK_Identifier);
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rng = FRandom::StaticFindRNG(sc.String);
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sc.MustGetToken(']');
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}
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else
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{
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rng = &pr_exrandom;
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}
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sc.MustGetToken('(');
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FxExpression *min = ParseExpressionM (sc, cls);
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sc.MustGetToken(',');
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FxExpression *max = ParseExpressionM (sc, cls);
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sc.MustGetToken(')');
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return new FxFRandom(rng, min, max, sc);
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}
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else if (sc.CheckToken(TK_Random2))
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{
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FRandom *rng;
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if (sc.CheckToken('['))
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{
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sc.MustGetToken(TK_Identifier);
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rng = FRandom::StaticFindRNG(sc.String);
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sc.MustGetToken(']');
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}
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else
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{
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rng = &pr_exrandom;
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}
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sc.MustGetToken('(');
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FxExpression *mask = NULL;
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if (!sc.CheckToken(')'))
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{
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mask = ParseExpressionM(sc, cls);
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sc.MustGetToken(')');
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}
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return new FxRandom2(rng, mask, sc);
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}
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else if (sc.CheckToken(TK_Abs))
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{
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sc.MustGetToken('(');
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FxExpression *x = ParseExpressionM (sc, cls);
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sc.MustGetToken(')');
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return new FxAbs(x);
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}
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else if (sc.CheckToken(TK_Identifier))
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{
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FName identifier = FName(sc.String);
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if (sc.CheckToken('('))
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{
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FArgumentList *args = NULL;
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try
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{
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if (!sc.CheckToken(')'))
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{
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args = new FArgumentList;
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do
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{
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args->Push(ParseExpressionM (sc, cls));
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}
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while (sc.CheckToken(','));
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sc.MustGetToken(')');
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}
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return new FxFunctionCall(NULL, identifier, args, sc);
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}
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catch (...)
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{
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delete args;
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throw;
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}
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}
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else
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{
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return new FxIdentifier(identifier, sc);
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}
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}
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else
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{
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FString tokname = sc.TokenName(sc.TokenType, sc.String);
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sc.ScriptError ("Unexpected token %s", tokname.GetChars());
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}
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return NULL;
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}
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