mirror of
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810 lines
21 KiB
C++
810 lines
21 KiB
C++
/*
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** c_expr.cpp
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** Console commands dealing with mathematical expressions
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**
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**---------------------------------------------------------------------------
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** Copyright 1998-2006 Randy Heit
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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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**
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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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// HEADER FILES ------------------------------------------------------------
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#include <stdlib.h>
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#include <math.h>
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#include <string.h>
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#include "c_dispatch.h"
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#include "c_cvars.h"
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// MACROS ------------------------------------------------------------------
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// TYPES -------------------------------------------------------------------
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enum EProductionType
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{
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PROD_String, PROD_Double
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};
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struct FProduction
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{
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EProductionType Type;
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};
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struct FStringProd : public FProduction
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{
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char Value[1];
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};
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struct FDoubleProd : public FProduction
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{
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double Value;
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};
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struct FProducer
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{
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char Token[4];
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FProduction *(*DoubleProducer) (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *(*StringProducer) (FStringProd *prod1, FStringProd *prod2);
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};
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// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
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// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------
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bool IsFloat (const char *str);
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// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
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static FProduction *ParseExpression (FCommandLine &argv, int &parsept);
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static const char *IsNum (const char *str);
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static FStringProd *NewStringProd (const char *str);
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static FStringProd *NewStringProd (size_t len);
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static FDoubleProd *NewDoubleProd (double val);
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static FStringProd *DoubleToString (FProduction *prod);
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static FDoubleProd *StringToDouble (FProduction *prod);
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void MaybeStringCoerce (FProduction *&prod1, FProduction *&prod2);
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void MustStringCoerce (FProduction *&prod1, FProduction *&prod2);
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void DoubleCoerce (FProduction *&prod1, FProduction *&prod2);
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FProduction *ProdAddDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdAddStr (FStringProd *prod1, FStringProd *prod2);
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FProduction *ProdSubDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdMulDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdDivDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdModDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdPowDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdLTDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdLTEDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdGTDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdGTEDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdEqDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdNeqDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdXorDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdAndDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdOrDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdLAndDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdLOrDbl (FDoubleProd *prod1, FDoubleProd *prod2);
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FProduction *ProdLTStr (FStringProd *prod1, FStringProd *prod2);
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FProduction *ProdLTEStr (FStringProd *prod1, FStringProd *prod2);
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FProduction *ProdGTStr (FStringProd *prod1, FStringProd *prod2);
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FProduction *ProdGTEStr (FStringProd *prod1, FStringProd *prod2);
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FProduction *ProdEqStr (FStringProd *prod1, FStringProd *prod2);
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FProduction *ProdNeqStr (FStringProd *prod1, FStringProd *prod2);
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// EXTERNAL DATA DECLARATIONS ----------------------------------------------
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// PUBLIC DATA DEFINITIONS -------------------------------------------------
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// PRIVATE DATA DEFINITIONS ------------------------------------------------
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static FProducer Producers[] =
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{
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{ "+", ProdAddDbl, ProdAddStr },
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{ "-", ProdSubDbl, NULL },
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{ "*", ProdMulDbl, NULL },
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{ "/", ProdDivDbl, NULL },
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{ "%", ProdModDbl, NULL },
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{ "^", ProdPowDbl, NULL },
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{ "<", ProdLTDbl, ProdLTStr },
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{ "<=", ProdLTEDbl, ProdLTEStr },
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{ ">", ProdGTDbl, ProdGTStr },
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{ ">=", ProdGTEDbl, ProdGTEStr },
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{ "=", ProdEqDbl, ProdEqStr },
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{ "==", ProdEqDbl, ProdEqStr },
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{ "!=", ProdNeqDbl, ProdNeqStr },
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{ "<>", ProdNeqDbl, ProdNeqStr },
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{ "xor", ProdXorDbl, NULL },
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{ "&", ProdAndDbl, NULL },
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{ "|", ProdOrDbl, NULL },
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{ "&&", ProdLAndDbl, NULL },
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{ "||", ProdLOrDbl, NULL }
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};
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// CODE --------------------------------------------------------------------
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//==========================================================================
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//
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// ParseExpression
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//
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// Builds a production from an expression. The supported syntax is LISP-like
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// but without parentheses.
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//
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//==========================================================================
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static FProduction *ParseExpression (FCommandLine &argv, int &parsept)
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{
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if (parsept >= argv.argc())
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return NULL;
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const char *token = argv[parsept++];
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FProduction *prod1 = NULL, *prod2 = NULL, *prod3 = NULL;
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if (IsFloat (token))
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{
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return NewDoubleProd (atof(token));
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}
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else if (stricmp (token, "true") == 0)
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{
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return NewDoubleProd (1.0);
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}
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else if (stricmp (token, "false") == 0)
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{
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return NewDoubleProd (0.0);
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}
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else
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{
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for (size_t i = 0; i < countof(Producers); ++i)
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{
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if (strcmp (Producers[i].Token, token) == 0)
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{
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prod1 = ParseExpression (argv, parsept);
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prod2 = ParseExpression (argv, parsept);
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if (prod1 == NULL || prod2 == NULL)
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{
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goto missing;
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}
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if (Producers[i].StringProducer == NULL)
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{
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DoubleCoerce (prod1, prod2);
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}
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else if (Producers[i].DoubleProducer == NULL)
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{
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MustStringCoerce (prod1, prod2);
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}
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else
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{
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MaybeStringCoerce (prod1, prod2);
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}
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if (prod1->Type == PROD_String)
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{
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prod3 = Producers[i].StringProducer ((FStringProd *)prod1, (FStringProd *)prod2);
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}
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else
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{
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prod3 = Producers[i].DoubleProducer ((FDoubleProd *)prod1, (FDoubleProd *)prod2);
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}
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goto done;
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}
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}
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if (strcmp ("!", token) == 0)
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{
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prod1 = ParseExpression (argv, parsept);
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if (prod1 == NULL)
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{
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goto missing;
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}
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if (prod1->Type == PROD_String)
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{
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prod1 = StringToDouble (prod1);
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}
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prod3 = NewDoubleProd (!static_cast<FDoubleProd *>(prod1)->Value);
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goto done;
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}
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return NewStringProd (token);
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}
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missing:
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Printf ("Missing argument to %s\n", token);
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done:
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if (prod2 != NULL) M_Free (prod2);
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if (prod1 != NULL) M_Free (prod1);
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return prod3;
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}
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//==========================================================================
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//
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// IsFloat
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//
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//==========================================================================
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bool IsFloat (const char *str)
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{
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const char *pt;
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if (*str == '+' || *str == '-')
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str++;
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if (*str == '.')
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{
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pt = str;
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}
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else
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{
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pt = IsNum (str);
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if (pt == NULL)
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return false;
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}
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if (*pt == '.')
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{
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pt = IsNum (pt+1);
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if (pt == NULL)
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return false;
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}
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if (*pt == 'e' || *pt == 'E')
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{
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pt++;
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if (*pt == '+' || *pt == '-')
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pt++;
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pt = IsNum (pt);
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}
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return pt != NULL && *pt == 0;
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}
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//==========================================================================
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//
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// IsNum
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//
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//==========================================================================
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static const char *IsNum (const char *str)
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{
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const char *start = str;
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while (*str)
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{
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if (*str >= '0' && *str <= '9')
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str++;
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else
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break;
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}
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return (str > start) ? str : NULL;
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}
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//==========================================================================
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//
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// NewStringProd (from a string)
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//
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//==========================================================================
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static FStringProd *NewStringProd (const char *str)
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{
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FStringProd *prod = (FStringProd *)M_Malloc (sizeof(FStringProd)+strlen(str));
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prod->Type = PROD_String;
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strcpy (prod->Value, str);
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return prod;
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}
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//==========================================================================
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//
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// NewStringProd (from a length)
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//
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//==========================================================================
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static FStringProd *NewStringProd (size_t len)
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{
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FStringProd *prod = (FStringProd *)M_Malloc (sizeof(FStringProd)+len);
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prod->Type = PROD_String;
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prod->Value[0] = 0;
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return prod;
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}
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//==========================================================================
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//
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// NewDoubleProd
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//
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//==========================================================================
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static FDoubleProd *NewDoubleProd (double val)
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{
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FDoubleProd *prod = (FDoubleProd *)M_Malloc (sizeof(FDoubleProd));
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prod->Type = PROD_Double;
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prod->Value = val;
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return prod;
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}
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//==========================================================================
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//
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// DoubleToString
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//
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//==========================================================================
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static FStringProd *DoubleToString (FProduction *prod)
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{
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char buf[128];
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FStringProd *newprod;
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mysnprintf (buf, countof(buf), "%g", static_cast<FDoubleProd *>(prod)->Value);
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newprod = NewStringProd (buf);
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M_Free (prod);
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return newprod;
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}
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//==========================================================================
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//
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// StringToDouble
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//
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//==========================================================================
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static FDoubleProd *StringToDouble (FProduction *prod)
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{
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FDoubleProd *newprod;
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newprod = NewDoubleProd (atof (static_cast<FStringProd *>(prod)->Value));
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M_Free (prod);
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return newprod;
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}
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//==========================================================================
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//
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// MaybeStringCoerce
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//
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// If one of the parameters is a string, convert the other to a string.
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//
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//==========================================================================
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void MaybeStringCoerce (FProduction *&prod1, FProduction *&prod2)
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{
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if (prod1->Type == PROD_String)
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{
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if (prod2->Type == PROD_Double)
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{
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prod2 = DoubleToString (prod2);
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}
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}
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else if (prod2->Type == PROD_String)
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{
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prod1 = DoubleToString (prod1);
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}
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}
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//==========================================================================
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//
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// MustStringCoerce
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//
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// Ensures that both parameters are strings
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//
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//==========================================================================
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void MustStringCoerce (FProduction *&prod1, FProduction *&prod2)
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{
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if (prod1->Type == PROD_Double)
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{
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prod1 = DoubleToString (prod1);
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}
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if (prod2->Type == PROD_Double)
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{
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prod2 = DoubleToString (prod2);
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}
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}
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//==========================================================================
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//
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// DoubleCoerce
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//
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// Ensures that both parameters are doubles
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//
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//==========================================================================
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void DoubleCoerce (FProduction *&prod1, FProduction *&prod2)
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{
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if (prod1->Type == PROD_String)
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{
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prod1 = StringToDouble (prod1);
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}
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if (prod2->Type == PROD_String)
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{
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prod2 = StringToDouble (prod2);
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}
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}
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//==========================================================================
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//
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// ProdAddDbl
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//
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//==========================================================================
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FProduction *ProdAddDbl (FDoubleProd *prod1, FDoubleProd *prod2)
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{
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return NewDoubleProd (prod1->Value + prod2->Value);
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}
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//==========================================================================
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//
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// ProdAddStr
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//
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//==========================================================================
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FProduction *ProdAddStr (FStringProd *prod1, FStringProd *prod2)
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{
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size_t len = strlen (prod1->Value) + strlen (prod2->Value) + 1;
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FStringProd *prod = NewStringProd (len);
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strcpy (prod->Value, prod1->Value);
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strcat (prod->Value, prod2->Value);
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return prod;
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}
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//==========================================================================
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//
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// ProdSubDbl
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//
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//==========================================================================
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FProduction *ProdSubDbl (FDoubleProd *prod1, FDoubleProd *prod2)
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{
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return NewDoubleProd (prod1->Value - prod2->Value);
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}
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//==========================================================================
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//
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// ProdMulDbl
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//
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//==========================================================================
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FProduction *ProdMulDbl (FDoubleProd *prod1, FDoubleProd *prod2)
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{
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return NewDoubleProd (prod1->Value * prod2->Value);
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}
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//==========================================================================
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//
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// ProdDivDbl
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//
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//==========================================================================
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FProduction *ProdDivDbl (FDoubleProd *prod1, FDoubleProd *prod2)
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{
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return NewDoubleProd (prod1->Value / prod2->Value);
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}
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//==========================================================================
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//
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// ProdModDbl
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//
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//==========================================================================
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FProduction *ProdModDbl (FDoubleProd *prod1, FDoubleProd *prod2)
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{
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return NewDoubleProd (fmod (prod1->Value, prod2->Value));
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}
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//==========================================================================
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//
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// ProdPowDbl
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//
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//==========================================================================
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FProduction *ProdPowDbl (FDoubleProd *prod1, FDoubleProd *prod2)
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{
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return NewDoubleProd (pow (prod1->Value, prod2->Value));
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}
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//==========================================================================
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//
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// ProdLTDbl
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//
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//==========================================================================
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FProduction *ProdLTDbl (FDoubleProd *prod1, FDoubleProd *prod2)
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{
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return NewDoubleProd (prod1->Value < prod2->Value);
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}
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//==========================================================================
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//
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// ProdLTEDbl
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//
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//==========================================================================
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FProduction *ProdLTEDbl (FDoubleProd *prod1, FDoubleProd *prod2)
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{
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return NewDoubleProd (prod1->Value <= prod2->Value);
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}
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//==========================================================================
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//
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// ProdGTDbl
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//
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//==========================================================================
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FProduction *ProdGTDbl (FDoubleProd *prod1, FDoubleProd *prod2)
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{
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return NewDoubleProd (prod1->Value > prod2->Value);
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}
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//==========================================================================
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//
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// ProdGTEDbl
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//
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//==========================================================================
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FProduction *ProdGTEDbl (FDoubleProd *prod1, FDoubleProd *prod2)
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{
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return NewDoubleProd (prod1->Value >= prod2->Value);
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}
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//==========================================================================
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//
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// ProdEqDbl
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//
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//==========================================================================
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|
|
|
FProduction *ProdEqDbl (FDoubleProd *prod1, FDoubleProd *prod2)
|
|
{
|
|
return NewDoubleProd (prod1->Value == prod2->Value);
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// ProdNeqDbl
|
|
//
|
|
//==========================================================================
|
|
|
|
FProduction *ProdNeqDbl (FDoubleProd *prod1, FDoubleProd *prod2)
|
|
{
|
|
return NewDoubleProd (prod1->Value != prod2->Value);
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// ProdLTStr
|
|
//
|
|
//==========================================================================
|
|
|
|
FProduction *ProdLTStr (FStringProd *prod1, FStringProd *prod2)
|
|
{
|
|
return NewDoubleProd (stricmp (prod1->Value, prod2->Value) < 0);
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// ProdLTEStr
|
|
//
|
|
//==========================================================================
|
|
|
|
FProduction *ProdLTEStr (FStringProd *prod1, FStringProd *prod2)
|
|
{
|
|
return NewDoubleProd (stricmp (prod1->Value, prod2->Value) <= 0);
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// ProdGTStr
|
|
//
|
|
//==========================================================================
|
|
|
|
FProduction *ProdGTStr (FStringProd *prod1, FStringProd *prod2)
|
|
{
|
|
return NewDoubleProd (stricmp (prod1->Value, prod2->Value) > 0);
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// ProdGTEStr
|
|
//
|
|
//==========================================================================
|
|
|
|
FProduction *ProdGTEStr (FStringProd *prod1, FStringProd *prod2)
|
|
{
|
|
return NewDoubleProd (stricmp (prod1->Value, prod2->Value) >= 0);
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// ProdEqStr
|
|
//
|
|
//==========================================================================
|
|
|
|
FProduction *ProdEqStr (FStringProd *prod1, FStringProd *prod2)
|
|
{
|
|
return NewDoubleProd (stricmp (prod1->Value, prod2->Value) == 0);
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// ProdNeqStr
|
|
//
|
|
//==========================================================================
|
|
|
|
FProduction *ProdNeqStr (FStringProd *prod1, FStringProd *prod2)
|
|
{
|
|
return NewDoubleProd (stricmp (prod1->Value, prod2->Value) != 0);
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// ProdXorDbl
|
|
//
|
|
//==========================================================================
|
|
|
|
FProduction *ProdXorDbl (FDoubleProd *prod1, FDoubleProd *prod2)
|
|
{
|
|
return NewDoubleProd ((double)((int64_t)prod1->Value ^ (int64_t)prod2->Value));
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// ProdAndDbl
|
|
//
|
|
//==========================================================================
|
|
|
|
FProduction *ProdAndDbl (FDoubleProd *prod1, FDoubleProd *prod2)
|
|
{
|
|
return NewDoubleProd ((double)((int64_t)prod1->Value & (int64_t)prod2->Value));
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// ProdOrDbl
|
|
//
|
|
//==========================================================================
|
|
|
|
FProduction *ProdOrDbl (FDoubleProd *prod1, FDoubleProd *prod2)
|
|
{
|
|
return NewDoubleProd ((double)((int64_t)prod1->Value | (int64_t)prod2->Value));
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// ProdLAndDbl
|
|
//
|
|
//==========================================================================
|
|
|
|
FProduction *ProdLAndDbl (FDoubleProd *prod1, FDoubleProd *prod2)
|
|
{
|
|
return NewDoubleProd ((double)((int64_t)prod1->Value && (int64_t)prod2->Value));
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// ProdLOrDbl
|
|
//
|
|
//==========================================================================
|
|
|
|
FProduction *ProdLOrDbl (FDoubleProd *prod1, FDoubleProd *prod2)
|
|
{
|
|
return NewDoubleProd ((double)((int64_t)prod1->Value || (int64_t)prod2->Value));
|
|
}
|
|
|
|
|
|
//==========================================================================
|
|
//
|
|
//
|
|
//
|
|
//==========================================================================
|
|
|
|
//==========================================================================
|
|
//
|
|
// CCMD test
|
|
//
|
|
// If <expr> is non-zero, execute <true cmd>.
|
|
// If <expr> is zero, execute [false cmd] if specified.
|
|
//
|
|
//==========================================================================
|
|
|
|
CCMD (test)
|
|
{
|
|
int parsept = 1;
|
|
FProduction *prod = ParseExpression (argv, parsept);
|
|
|
|
if (prod == NULL || parsept >= argv.argc())
|
|
{
|
|
Printf ("Usage: test <expr> <true cmd> [false cmd]\n");
|
|
}
|
|
else
|
|
{
|
|
if (prod->Type == PROD_String)
|
|
{
|
|
prod = StringToDouble (prod);
|
|
}
|
|
|
|
if (static_cast<FDoubleProd *>(prod)->Value != 0.0)
|
|
{
|
|
AddCommandString (argv[parsept]);
|
|
}
|
|
else if (++parsept < argv.argc())
|
|
{
|
|
AddCommandString (argv[parsept]);
|
|
}
|
|
}
|
|
if (prod != NULL)
|
|
{
|
|
M_Free (prod);
|
|
}
|
|
}
|
|
|
|
//==========================================================================
|
|
//
|
|
// CCMD eval
|
|
//
|
|
// Evaluates an expression and either prints it to the console or stores
|
|
// it in an existing cvar.
|
|
//
|
|
//==========================================================================
|
|
|
|
CCMD (eval)
|
|
{
|
|
if (argv.argc() >= 2)
|
|
{
|
|
int parsept = 1;
|
|
FProduction *prod = ParseExpression (argv, parsept);
|
|
|
|
if (prod != NULL)
|
|
{
|
|
if (parsept < argv.argc())
|
|
{
|
|
FBaseCVar *var = FindCVar (argv[parsept], NULL);
|
|
if (var == NULL)
|
|
{
|
|
Printf ("Unknown variable %s\n", argv[parsept]);
|
|
}
|
|
else
|
|
{
|
|
UCVarValue val;
|
|
|
|
if (prod->Type == PROD_Double)
|
|
{
|
|
val.Float = (float)static_cast<FDoubleProd *>(prod)->Value;
|
|
var->SetGenericRep (val, CVAR_Float);
|
|
}
|
|
else
|
|
{
|
|
val.String = static_cast<FStringProd *>(prod)->Value;
|
|
var->SetGenericRep (val, CVAR_String);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (prod->Type == PROD_Double)
|
|
{
|
|
Printf ("%g\n", static_cast<FDoubleProd *>(prod)->Value);
|
|
}
|
|
else
|
|
{
|
|
Printf ("%s\n", static_cast<FStringProd *>(prod)->Value);
|
|
}
|
|
}
|
|
M_Free (prod);
|
|
return;
|
|
}
|
|
}
|
|
|
|
Printf ("Usage: eval <expression> [variable]\n");
|
|
}
|