2010-06-16 19:56:59 +00:00

351 lines
9.4 KiB
C

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "muParserDLL.h"
#define PARSER_CONST_PI 3.141592653589793238462643
#define PARSER_CONST_E 2.718281828459045235360287
#define PARSER_MAXVARS 10
//---------------------------------------------------------------------------
// Callbacks for postfix operators
double Mega(double a_fVal)
{
return a_fVal * 1.0e6;
}
double Milli(double a_fVal)
{
return a_fVal / 1.0e3;
}
double ZeroArg()
{
printf("i'm a function without arguments.\n");
return 123;
}
//---------------------------------------------------------------------------
// Callbacks for infix operators
double Not(double v) { return v==0; }
//---------------------------------------------------------------------------
// Function callbacks
double Rnd(double v) { return v * rand() / (double)(RAND_MAX+1.0); }
double SampleQuery(const char *szMsg)
{
if (szMsg)
printf("%s\n", szMsg);
return 999;
}
double Sum(const double *a_afArg, int a_iArgc)
{
double fRes=0;
int i=0;
for (i=0; i<a_iArgc; ++i)
fRes += a_afArg[i];
return fRes;
}
//---------------------------------------------------------------------------
// Binarty operator callbacks
muFloat_t Add(muFloat_t v1, muFloat_t v2)
{
return v1+v2;
}
muFloat_t Mul(muFloat_t v1, muFloat_t v2)
{
return v1*v2;
}
//---------------------------------------------------------------------------
// Factory function for creating new parser variables
// This could as well be a function performing database queries.
muFloat_t* AddVariable(const muChar_t* a_szName, void *pUserData)
{
static double afValBuf[PARSER_MAXVARS]; // I don't want dynamic allocation here
static int iVal = 0; // so i used this buffer
printf("Generating new variable \"%s\" (slots left: %d)\n", a_szName, PARSER_MAXVARS-iVal);
afValBuf[iVal] = 0;
if (iVal>=PARSER_MAXVARS-1)
{
printf("Variable buffer overflow.");
return NULL;
}
return &afValBuf[iVal++];
}
//---------------------------------------------------------------------------
void Intro(muParserHandle_t hParser)
{
printf(" __________ \n");
printf(" _____ __ __\\______ \\_____ _______ ______ ____ _______\n");
printf(" / \\ | | \\| ___/\\__ \\ \\_ __ \\/ ___/_/ __ \\\\_ __ \\ \n");
printf(" | Y Y \\| | /| | / __ \\_| | \\/\\___ \\ \\ ___/ | | \\/ \n");
printf(" |__|_| /|____/ |____| (____ /|__| /____ > \\___ >|__| \n");
printf(" \\/ \\/ \\/ \\/ \n");
printf(" Version %s (DLL)\n", mupGetVersion(hParser));
printf(" (C) 2010 Ingo Berg\n");
printf("---------------------------------------\n");
printf("Commands:\n");
printf(" list var - list parser variables\n");
printf(" list exprvar - list expression variables\n");
printf(" list const - list all numeric parser constants\n");
printf(" locale de - switch to german locale\n");
printf(" locale en - switch to english locale\n");
printf(" locale reset - reset locale\n");
printf(" quit - exits the parser\n\n");
printf("Constants:\n");
printf(" \"_e\" 2.718281828459045235360287\n");
printf(" \"_pi\" 3.141592653589793238462643\n");
printf("---------------------------------------\n");
printf("Please enter a formula:\n");
}
//---------------------------------------------------------------------------
// Callback function for parser errors
void OnError(muParserHandle_t hParser)
{
printf("\nError:\n");
printf("------\n");
printf("Message: \"%s\"\n", mupGetErrorMsg(hParser));
printf("Token: \"%s\"\n", mupGetErrorToken(hParser));
printf("Position: %d\n", mupGetErrorPos(hParser));
printf("Errc: %d\n", mupGetErrorCode(hParser));
}
//---------------------------------------------------------------------------
void ListVar(muParserHandle_t a_hParser)
{
int iNumVar = mupGetVarNum(a_hParser);
int i = 0;
if (iNumVar==0)
{
printf("No variables defined\n");
return;
}
printf("\nExpression variables:\n");
printf("---------------------\n");
printf("Number: %d\n", iNumVar);
for (i=0; i<iNumVar; ++i)
{
const muChar_t* szName = 0;
muFloat_t* pVar = 0;
mupGetVar(a_hParser, i, &szName, &pVar);
printf("Name: %s Address: [0x%x]\n", szName, (long long)pVar);
}
}
//---------------------------------------------------------------------------
void ListExprVar(muParserHandle_t a_hParser)
{
muInt_t iNumVar = mupGetExprVarNum(a_hParser),
i = 0;
if (iNumVar==0)
{
printf("Expression dos not contain variables\n");
return;
}
printf("\nExpression variables:\n");
printf("---------------------\n");
printf("Expression: %s\n", mupGetExpr(a_hParser) );
printf("Number: %d\n", iNumVar);
for (i=0; i<iNumVar; ++i)
{
const muChar_t* szName = 0;
muFloat_t* pVar = 0;
mupGetExprVar(a_hParser, i, &szName, &pVar);
printf("Name: %s Address: [0x%x]\n", szName, (long long)pVar);
}
}
//---------------------------------------------------------------------------
void ListConst(muParserHandle_t a_hParser)
{
muInt_t iNumVar = mupGetConstNum(a_hParser),
i = 0;
if (iNumVar==0)
{
printf("No constants defined\n");
return;
}
printf("\nParser constants:\n");
printf("---------------------\n");
printf("Number: %d", iNumVar);
for (i=0; i<iNumVar; ++i)
{
const muChar_t* szName = 0;
muFloat_t fVal = 0;
mupGetConst(a_hParser, i, &szName, &fVal);
printf(" %s = %f\n", szName, fVal);
}
}
//---------------------------------------------------------------------------
/** \brief Check for external keywords.
*/
muBool_t CheckKeywords(const char *a_szLine, muParserHandle_t a_hParser)
{
if (!strcmp(a_szLine, "quit"))
{
exit(0);
}
else if (!strcmp(a_szLine,"list var"))
{
ListVar(a_hParser);
return 1;
}
else if (!strcmp(a_szLine, "list exprvar"))
{
ListExprVar(a_hParser);
return 1;
}
else if (!strcmp(a_szLine, "list const"))
{
ListConst(a_hParser);
return 1;
}
else if (!strcmp(a_szLine, "locale de"))
{
printf("Setting german locale: ArgSep=';' DecSep=',' ThousandsSep='.'\n");
mupSetArgSep(a_hParser, ';');
mupSetDecSep(a_hParser, ',');
mupSetThousandsSep(a_hParser, '.');
return 1;
}
else if (!strcmp(a_szLine, "locale en"))
{
printf("Setting english locale: ArgSep=',' DecSep='.' ThousandsSep=''\n");
mupSetArgSep(a_hParser, ',');
mupSetDecSep(a_hParser, '.');
mupSetThousandsSep(a_hParser, 0);
return 1;
}
else if (!strcmp(a_szLine, "locale reset"))
{
printf("Resetting locale\n");
mupResetLocale(a_hParser);
return 1;
}
return 0;
}
//---------------------------------------------------------------------------
void Calc()
{
muChar_t szLine[100];
muFloat_t fVal = 0,
afVarVal[] = { 1, 2 }; // Values of the parser variables
muParserHandle_t hParser;
hParser = mupCreate(); // initialize the parser
Intro(hParser);
// Set an error handler [optional]
// the only function that does not take a parser instance handle
mupSetErrorHandler(hParser, OnError);
//#define GERMAN_LOCALS
#ifdef GERMAN_LOCALS
mupSetArgSep(hParser, ';');
mupSetDecSep(hParser, ',');
mupSetThousandsSep(hParser, '.');
#else
mupSetArgSep(hParser, ',');
mupSetDecSep(hParser, '.');
#endif
// Set a variable factory
mupSetVarFactory(hParser, AddVariable, NULL);
// Define parser variables and bind them to C++ variables [optional]
mupDefineConst(hParser, "const1", 1);
mupDefineConst(hParser, "const2", 2);
mupDefineStrConst(hParser, "strBuf", "Hallo welt");
// Define parser variables and bind them to C++ variables [optional]
mupDefineVar(hParser, "a", &afVarVal[0]);
mupDefineVar(hParser, "b", &afVarVal[1]);
// Define postfix operators [optional]
mupDefinePostfixOprt(hParser, "M", Mega, 0);
mupDefinePostfixOprt(hParser, "m", Milli, 0);
// Define infix operator [optional]
mupDefineInfixOprt(hParser, "!", Not, 0);
// Define functions [optional]
// mupDefineStrFun(hParser, "query", SampleQuery, 0); // Add an unoptimizeable function
mupDefineFun0(hParser, "zero", ZeroArg, 0);
mupDefineFun1(hParser, "rnd", Rnd, 0); // Add an unoptimizeable function
mupDefineFun1(hParser, "rnd2", Rnd, 1);
mupDefineMultFun(hParser, "_sum", Sum, 0); // "sum" is already a default function
// Define binary operators [optional]
mupDefineOprt(hParser, "add", Add, 0, 0);
mupDefineOprt(hParser, "mul", Mul, 1, 0);
while ( fgets(szLine, 99, stdin) )
{
szLine[strlen(szLine)-1] = 0; // overwrite the newline
if (CheckKeywords(szLine, hParser))
continue;
mupSetExpr(hParser, szLine);
fVal = mupEval(hParser);
// Without an Error handler function
// you must use this for error treatment:
//if (mupError(hParser))
//{
// printf("\nError:\n");
// printf("------\n");
// printf("Message: %s\n", mupGetErrorMsg(hParser) );
// printf("Token: %s\n", mupGetErrorToken(hParser) );
// printf("Position: %s\n", mupGetErrorPos(hParser) );
// printf("Errc: %s\n", mupGetErrorCode(hParser) );
// continue;
//}
if (!mupError(hParser))
printf("%f\n", fVal);
} // while
// finalle free the parser ressources
mupRelease(hParser);
}
//---------------------------------------------------------------------------
int main(int argc, char *argv[])
{
Calc();
}