mirror of
https://github.com/ZDoom/gzdoom-gles.git
synced 2024-12-02 00:42:08 +00:00
648 lines
15 KiB
C++
648 lines
15 KiB
C++
// Emacs style mode select -*- C++ -*-
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//----------------------------------------------------------------------------
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//
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// Copyright(C) 2000 Simon Howard
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//
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// This program is free software; you can redistribute it and/or modify
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// it under 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
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// (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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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//--------------------------------------------------------------------------
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//
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// Operators
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//
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// Handler code for all the operators. The 'other half'
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// of the parsing.
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//
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// By Simon Howard
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//
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//---------------------------------------------------------------------------
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//
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// FraggleScript is from SMMU which is under the GPL. Technically,
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// therefore, combining the FraggleScript code with the non-free
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// ZDoom code is a violation of the GPL.
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//
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// As this may be a problem for you, I hereby grant an exception to my
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// copyright on the SMMU source (including FraggleScript). You may use
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// any code from SMMU in (G)ZDoom, provided that:
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//
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// * For any binary release of the port, the source code is also made
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// available.
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// * The copyright notice is kept on any file containing my code.
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//
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//
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/* includes ************************/
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#include "t_script.h"
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#define evaluate_leftnright(a, b, c) {\
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EvaluateExpression(left, (a), (b)-1); \
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EvaluateExpression(right, (b)+1, (c)); }\
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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FParser::operator_t FParser::operators[]=
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{
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{"=", &FParser::OPequals, backward},
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{"||", &FParser::OPor, forward},
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{"&&", &FParser::OPand, forward},
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{"|", &FParser::OPor_bin, forward},
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{"&", &FParser::OPand_bin, forward},
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{"==", &FParser::OPcmp, forward},
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{"!=", &FParser::OPnotcmp, forward},
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{"<", &FParser::OPlessthan, forward},
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{">", &FParser::OPgreaterthan, forward},
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{"<=", &FParser::OPlessthanorequal, forward},
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{">=", &FParser::OPgreaterthanorequal, forward},
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{"+", &FParser::OPplus, forward},
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{"-", &FParser::OPminus, forward},
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{"*", &FParser::OPmultiply, forward},
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{"/", &FParser::OPdivide, forward},
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{"%", &FParser::OPremainder, forward},
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{"~", &FParser::OPnot_bin, forward}, // haleyjd
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{"!", &FParser::OPnot, forward},
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{"++", &FParser::OPincrement, forward},
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{"--", &FParser::OPdecrement, forward},
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{".", &FParser::OPstructure, forward},
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};
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int FParser::num_operators = sizeof(FParser::operators) / sizeof(FParser::operator_t);
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/***************** logic *********************/
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPequals(svalue_t &result, int start, int n, int stop)
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{
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DFsVariable *var;
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var = Script->FindVariable(Tokens[start]);
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if(var)
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{
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EvaluateExpression(result, n+1, stop);
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var->SetValue (result);
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}
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else
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{
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script_error("unknown variable '%s'\n", Tokens[start]);
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}
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPor(svalue_t &result, int start, int n, int stop)
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{
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int exprtrue = false;
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// if first is true, do not evaluate the second
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EvaluateExpression(result, start, n-1);
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if(intvalue(result))
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exprtrue = true;
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else
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{
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EvaluateExpression(result, n+1, stop);
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exprtrue = !!intvalue(result);
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}
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result.type = svt_int;
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result.value.i = exprtrue;
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPand(svalue_t &result, int start, int n, int stop)
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{
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int exprtrue = true;
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// if first is false, do not eval second
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EvaluateExpression(result, start, n-1);
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if(!intvalue(result) )
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exprtrue = false;
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else
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{
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EvaluateExpression(result, n+1, stop);
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exprtrue = !!intvalue(result);
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}
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result.type = svt_int;
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result.value.i = exprtrue;
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPcmp(svalue_t &result, int start, int n, int stop)
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{
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svalue_t left, right;
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evaluate_leftnright(start, n, stop);
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result.type = svt_int; // always an int returned
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if(left.type == svt_string && right.type == svt_string)
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{
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result.value.i = !strcmp(left.string, right.string);
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return;
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}
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// haleyjd: direct mobj comparison when both are mobj
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if(left.type == svt_mobj && right.type == svt_mobj)
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{
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// we can safely assume reference equivalency for
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// AActor's in all cases since they are static for the
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// duration of a level
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result.value.i = (left.value.mobj == right.value.mobj);
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return;
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}
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if(left.type == svt_fixed || right.type == svt_fixed)
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{
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result.value.i = (fixedvalue(left) == fixedvalue(right));
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return;
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}
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result.value.i = (intvalue(left) == intvalue(right));
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPnotcmp(svalue_t &result, int start, int n, int stop)
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{
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OPcmp(result, start, n, stop);
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result.type = svt_int;
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result.value.i = !result.value.i;
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPlessthan(svalue_t &result, int start, int n, int stop)
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{
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svalue_t left, right;
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evaluate_leftnright(start, n, stop);
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result.type = svt_int;
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// haleyjd: 8-17
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if(left.type == svt_fixed || right.type == svt_fixed)
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result.value.i = (fixedvalue(left) < fixedvalue(right));
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else
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result.value.i = (intvalue(left) < intvalue(right));
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPgreaterthan(svalue_t &result, int start, int n, int stop)
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{
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svalue_t left, right;
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evaluate_leftnright(start, n, stop);
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// haleyjd: 8-17
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result.type = svt_int;
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if(left.type == svt_fixed || right.type == svt_fixed)
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result.value.i = (fixedvalue(left) > fixedvalue(right));
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else
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result.value.i = (intvalue(left) > intvalue(right));
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPnot(svalue_t &result, int start, int n, int stop)
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{
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EvaluateExpression(result, n+1, stop);
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result.value.i = !intvalue(result);
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result.type = svt_int;
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPplus(svalue_t &result, int start, int n, int stop)
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{
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svalue_t left, right;
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evaluate_leftnright(start, n, stop);
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if (left.type == svt_string)
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{
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if (right.type == svt_string)
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{
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result.string.Format("%s%s", left.string.GetChars(), right.string.GetChars());
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}
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else if (right.type == svt_fixed)
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{
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result.string.Format("%s%4.4f", left.string.GetChars(), floatvalue(right));
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}
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else
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{
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result.string.Format("%s%i", left.string.GetChars(), intvalue(right));
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}
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result.type = svt_string;
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}
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// haleyjd: 8-17
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else if(left.type == svt_fixed || right.type == svt_fixed)
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{
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result.type = svt_fixed;
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result.value.f = fixedvalue(left) + fixedvalue(right);
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}
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else
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{
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result.type = svt_int;
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result.value.i = intvalue(left) + intvalue(right);
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}
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPminus(svalue_t &result, int start, int n, int stop)
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{
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svalue_t left, right;
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// do they mean minus as in '-1' rather than '2-1'?
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if(start == n)
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{
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// kinda hack, hehe
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EvaluateExpression(right, n+1, stop);
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}
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else
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{
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evaluate_leftnright(start, n, stop);
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}
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// haleyjd: 8-17
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if(left.type == svt_fixed || right.type == svt_fixed)
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{
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result.type = svt_fixed;
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result.value.f = fixedvalue(left) - fixedvalue(right);
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}
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else
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{
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result.type = svt_int;
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result.value.i = intvalue(left) - intvalue(right);
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}
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPmultiply(svalue_t &result,int start, int n, int stop)
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{
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svalue_t left, right;
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evaluate_leftnright(start, n, stop);
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// haleyjd: 8-17
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if(left.type == svt_fixed || right.type == svt_fixed)
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{
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result.setDouble(floatvalue(left) * floatvalue(right));
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}
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else
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{
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result.type = svt_int;
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result.value.i = intvalue(left) * intvalue(right);
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}
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPdivide(svalue_t &result, int start, int n, int stop)
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{
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svalue_t left, right;
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evaluate_leftnright(start, n, stop);
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// haleyjd: 8-17
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if(left.type == svt_fixed || right.type == svt_fixed)
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{
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auto fr = floatvalue(right);
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if(fr == 0)
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script_error("divide by zero\n");
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else
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{
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result.setDouble(floatvalue(left) / fr);
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}
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}
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else
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{
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auto ir = intvalue(right);
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if(!ir)
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script_error("divide by zero\n");
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else
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{
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result.type = svt_int;
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result.value.i = intvalue(left) / ir;
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}
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}
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPremainder(svalue_t &result, int start, int n, int stop)
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{
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svalue_t left, right;
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int ir;
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evaluate_leftnright(start, n, stop);
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if(!(ir = intvalue(right)))
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script_error("divide by zero\n");
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else
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{
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result.type = svt_int;
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result.value.i = intvalue(left) % ir;
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}
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}
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/********** binary operators **************/
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPor_bin(svalue_t &result, int start, int n, int stop)
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{
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svalue_t left, right;
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evaluate_leftnright(start, n, stop);
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result.type = svt_int;
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result.value.i = intvalue(left) | intvalue(right);
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPand_bin(svalue_t &result, int start, int n, int stop)
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{
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svalue_t left, right;
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evaluate_leftnright(start, n, stop);
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result.type = svt_int;
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result.value.i = intvalue(left) & intvalue(right);
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPnot_bin(svalue_t &result, int start, int n, int stop)
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{
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EvaluateExpression(result, n+1, stop);
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result.value.i = ~intvalue(result);
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result.type = svt_int;
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPincrement(svalue_t &result, int start, int n, int stop)
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{
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if(start == n) // ++n
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{
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DFsVariable *var;
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var = Script->FindVariable(Tokens[stop]);
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if(!var)
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{
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script_error("unknown variable '%s'\n", Tokens[stop]);
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}
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var->GetValue(result);
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// haleyjd
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if(var->type != svt_fixed)
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{
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result.value.i = intvalue(result) + 1;
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result.type = svt_int;
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var->SetValue (result);
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}
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else
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{
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result.setDouble(floatvalue(result)+1);
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var->SetValue (result);
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}
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}
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else if(stop == n) // n++
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{
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svalue_t newvalue;
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DFsVariable *var;
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var = Script->FindVariable(Tokens[start]);
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if(!var)
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{
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script_error("unknown variable '%s'\n", Tokens[start]);
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}
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var->GetValue(result);
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// haleyjd
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if(var->type != svt_fixed)
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{
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newvalue.type = svt_int;
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newvalue.value.i = intvalue(result) + 1;
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var->SetValue (newvalue);
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}
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else
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{
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newvalue.setDouble(floatvalue(result)+1);
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var->SetValue (newvalue);
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}
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}
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else
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{
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script_error("incorrect arguments to ++ operator\n");
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}
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPdecrement(svalue_t &result, int start, int n, int stop)
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{
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if(start == n) // ++n
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{
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DFsVariable *var;
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var = Script->FindVariable(Tokens[stop]);
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if(!var)
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{
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script_error("unknown variable '%s'\n", Tokens[stop]);
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}
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var->GetValue(result);
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// haleyjd
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if(var->type != svt_fixed)
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{
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result.value.i = intvalue(result) - 1;
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result.type = svt_int;
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var->SetValue (result);
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}
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else
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{
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result.setDouble(floatvalue(result)-1);
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result.type = svt_fixed;
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var->SetValue (result);
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}
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}
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else if(stop == n) // n++
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{
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svalue_t newvalue;
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DFsVariable *var;
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var = Script->FindVariable(Tokens[start]);
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if(!var)
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{
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script_error("unknown variable '%s'\n", Tokens[start]);
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}
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var->GetValue(result);
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// haleyjd
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if(var->type != svt_fixed)
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{
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newvalue.type = svt_int;
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newvalue.value.i = intvalue(result) - 1;
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var->SetValue (newvalue);
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}
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else
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{
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newvalue.setDouble(floatvalue(result)-1);
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var->SetValue (newvalue);
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}
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}
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else
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{
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script_error("incorrect arguments to ++ operator\n");
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}
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPlessthanorequal(svalue_t &result, int start, int n, int stop)
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{
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svalue_t left, right;
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evaluate_leftnright(start, n, stop);
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result.type = svt_int;
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if(left.type == svt_fixed || right.type == svt_fixed)
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result.value.i = (fixedvalue(left) <= fixedvalue(right));
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else
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result.value.i = (intvalue(left) <= intvalue(right));
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}
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//-----------------------------------------------------------------------------
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//
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//
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//
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//-----------------------------------------------------------------------------
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void FParser::OPgreaterthanorequal(svalue_t &result, int start, int n, int stop)
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{
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svalue_t left, right;
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evaluate_leftnright(start, n, stop);
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result.type = svt_int;
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if(left.type == svt_fixed || right.type == svt_fixed)
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result.value.i = (fixedvalue(left) >= fixedvalue(right));
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else
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result.value.i = (intvalue(left) >= intvalue(right));
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}
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