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CMathParser.cpp
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CMathParser.cpp
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#ifndef _CMathParser_CPP
#define _CMathParser_CPP
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#include <Windows.H>
#include <StdIO.H>
#include <StdLib.H>
#include <Math.H>
#include <Float.H>
#include <Limits.H>
#include "CMathParser.h"
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//using namespace NSWFL::String;
#ifndef _CVTBUFSIZE
#define _CVTBUFSIZE (309+40) /* Number of digits in maximum double precision value + slop */
#endif
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
const char* sNativeMethods[] =
{
"ACOS",
"ASIN",
"ATAN",
"ATAN2",
"LDEXP",
"SINH",
"COSH",
"TANH",
"LOG",
"LOG10",
"EXP",
"MODPOW",
"SQRT",
"POW",
"FLOOR",
"CEIL",
"NOT",
"AVG",
"SUM",
"TAN",
"ATAN",
"SIN",
"COS",
"ABS",
NULL
};
const char *sPreOrder[] =
{
"!", //Logical NOT
NULL
};
const char *sFirstOrder[] =
{
"~", //Bitwise NOT
"*", //Multiplication
"/", //Division
"%", //Modulation
NULL
};
const char *sSecondOrder[] =
{
"+", //Addition
"-", //Subtraction
NULL
};
const char *sThirdOrder[] =
{
"<>", //Logical Not Equal
"|=", //Bitwise Or Equal
"&=", //Bitwise And Equal
"^=", //Bitwise XOR Equal
"<=", //Logical Less or Equal
">=", //Logical Greater or Equal
"!=", //Logical Not Equal
"<<", //Bitwise Left Shift
">>", //Bitwise Right Shift
"=", //Logical Equals
">", //Logical Greater Than
"<", //Logical Less Than
"&&", //Logical AND
"||", //Logical OR
"|", //Bitwise OR
"&", //Bitwise AND
"^", //Exclusive OR
NULL
};
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Lets us know whether the identifier is a built-in function.
/// </summary>
/// <param name="sName"></param>
/// <returns></returns>
bool CMathParser::IsNativeMethod(const char* sName)
{
for (int i = 0; sNativeMethods[i] != NULL; i++)
{
if (_strcmpi(sNativeMethods[i], sName) == 0)
{
return true;
}
}
return false;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
int CMathParser::TrailingChars(const char *sVal, int iStartPos, const char cChar)
{
for (int i = iStartPos; i > 0; i--)
{
if (sVal[i] != cChar)
{
return iStartPos - i;
}
}
return iStartPos;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
int CMathParser::SmartRound(double dValue, char *sOut, int iMaxOutSz)
{
char sVal[_CVTBUFSIZE * 2];
char sFormat[32];
int iValLen = this->DoubleToChar(dValue, sVal, sizeof(sVal));
if (iValLen < 0)
{
return -1;
}
int iDecPos = InStr(".", sVal, iValLen, 0);
if (iDecPos < 0)
{
return sprintf_s(sOut, iMaxOutSz, "%.0f", dValue);
}
//Detect long trail before last number (ex: 3.14000000000000000001).
if (sVal[iValLen - 1] != sVal[iValLen - 2])
{
int iTrailPos = iValLen - 2;
int iTrailAfterLastNumber = 0;
while (sVal[iTrailPos] == sVal[iValLen - 2])
{
iTrailPos--;
iTrailAfterLastNumber++;
}
if (iTrailAfterLastNumber >= 3)
{
sVal[iValLen - 1] = '\0'; //Truncate last number;
}
}
//Detect trailing 9's (ex: 3.99999999999999999).
int iNines = this->TrailingChars(sVal, iValLen - 1, '9');
if (iNines > 8)
{
int iRoundTo = (iValLen - iNines) - (iDecPos + 1);
sprintf_s(sFormat, sizeof(sFormat), "%%.%df", iRoundTo);
sprintf_s(sOut, iMaxOutSz, sFormat, dValue);
}
else {
//Detect trailing 0's (ex: 3.0000000000000).
int iZeros = TrailingChars(sVal, iValLen - 2, '0');
if (iZeros > 4)
{
int iRoundTo = (iValLen - iZeros) - (iDecPos + 2);
sprintf_s(sFormat, sizeof(sFormat), "%%.%df", iRoundTo);
sprintf_s(sOut, iMaxOutSz, sFormat, dValue);
}
else {
strcpy_s(sOut, iMaxOutSz, sVal);
}
}
int iSz = (int)strlen(sOut);
//Remove any remaining 0's after conversion.
if (sOut[iSz - 1] == '0')
{
iSz--;
while (sOut[iSz] == '0')
{
iSz--;
}
if (sOut[iSz] == '.')
{
iSz--;
}
iSz++;
}
sOut[iSz] = '\0';
return iSz;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Converts a double floating point to a string.
/// </summary>
/// <param name="dVal"></param>
/// <param name="sOut"></param>
/// <param name="iMaxOutSz"></param>
/// <returns></returns>
int CMathParser::DoubleToChar(double dVal, char *sOut, int iMaxOutSz)
{
int iSigned = 0;
int iDecPos = 0;
int iWPos = 0;
int iValLen = 0;
if (dVal == 0)
{
strcpy_s(sOut, iMaxOutSz, "0");
return 1;
}
char sVal[_CVTBUFSIZE * 2];
if (_fcvt_s(sVal, sizeof(sVal), dVal, this->ciPrecision, &iDecPos, &iSigned) != 0)
{
return -1;
}
iValLen = (int)strlen(sVal);
if (iSigned)
{
sOut[iWPos++] = '-';
}
if (iDecPos <= 0)
{
sOut[iWPos++] = '0';
sOut[iWPos++] = '.';
while (iDecPos < 0)
{
sOut[iWPos++] = '0';
iDecPos++;
}
iDecPos = -1;
}
for (int iRPos = 0; iRPos < iValLen; iRPos++)
{
if (iRPos == iDecPos)
{
sOut[iWPos++] = '.';
}
sOut[iWPos++] = sVal[iRPos];
}
if (sOut[iWPos - 1] == '0')
{
iWPos--;
while (iWPos > 2 && sOut[iWPos] == '0' && sOut[iWPos - 1] != '.')
{
iWPos--;
}
if (sOut[iWPos] == '.')
{
iWPos--;
}
iWPos++;
}
sOut[iWPos] = '\0';
return iWPos;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Gets the number to the left of an operator.
/// </summary>
/// <param name="pExp"></param>
/// <param name="iStartPos"></param>
/// <param name="sOutVal"></param>
/// <param name="iMaxSz"></param>
/// <param name="iOutSz"></param>
/// <param name="iBegin"></param>
/// <returns></returns>
CMathParser::MathResult CMathParser::GetLeftNumber(MATHEXPRESSION *pExp, int iStartPos, char *sOutVal, int iMaxSz, int *iOutSz, int *iBegin)
{
int iRPos = (iStartPos - 1);
int iWPos = 0;
iMaxSz--;
while (iRPos >= 0 && iWPos < iMaxSz)
{
if (this->IsMathChar(pExp->Text[iRPos]))
{
if ((pExp->Text[iRPos] == '-' || pExp->Text[iRPos] == '+'))
{
if (iRPos > 0)
{
if (!this->IsMathChar(pExp->Text[iRPos - 1]))
{
break;
}
}
else {
//Negative or Positive number is explicitly defined.
}
}
else {
break;
}
}
else if (!IsNumeric(pExp->Text[iRPos]) && pExp->Text[iRPos] != '.')
{
return this->SetError(ResultInvalidToken, "Token is invalid: %c", pExp->Text[iRPos]);
}
sOutVal[iWPos++] = pExp->Text[iRPos--];
}
sOutVal[iWPos] = '\0';
ReverseString(sOutVal, iWPos);
*iOutSz = iWPos;
*iBegin = (iRPos + 1);
return ResultOk;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Gets the number to the right of an operator.
/// </summary>
/// <param name="pExp"></param>
/// <param name="iStartPos"></param>
/// <param name="sOutVal"></param>
/// <param name="iMaxSz"></param>
/// <param name="iOutSz"></param>
/// <param name="iEnd"></param>
/// <returns></returns>
CMathParser::MathResult CMathParser::GetRightNumber(MATHEXPRESSION *pExp, int iStartPos, char *sOutVal, int iMaxSz, int *iOutSz, int *iEnd)
{
int iRPos = iStartPos;
int iWPos = 0;
iMaxSz--;
while (iRPos < pExp->Length && iWPos < iMaxSz)
{
if (this->IsMathChar(pExp->Text[iRPos]))
{
if ((pExp->Text[iRPos] == '-' || pExp->Text[iRPos] == '+') && iRPos < pExp->Length)
{
if (!this->IsMathChar(pExp->Text[iRPos - 1]))
{
break;
}
}
else {
break;
}
}
else if (!IsNumeric(pExp->Text[iRPos]) && pExp->Text[iRPos] != '.')
{
return this->SetError(ResultInvalidToken, "Token is invalid: %c", pExp->Text[iRPos]);
}
sOutVal[iWPos++] = pExp->Text[iRPos++];
}
sOutVal[iWPos] = '\0';
*iOutSz = iWPos;
*iEnd = iRPos;
return ResultOk;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Parses a single operation.
/// </summary>
/// <param name="pInst"></param>
/// <param name="pExp"></param>
/// <param name="sOp"></param>
/// <param name="iOpPos"></param>
/// <param name="iOpSz"></param>
/// <returns></returns>
CMathParser::MathResult CMathParser::ParseOperator(MATHINSTANCE *pInst, MATHEXPRESSION *pExp, const char *sOp, int iOpPos, int iOpSz)
{
char sVal[_CVTBUFSIZE];
char sVal1[_CVTBUFSIZE];
char sVal2[_CVTBUFSIZE];
int iValSz = 0;
MathResult ErrorCode = ResultOk;
int iBegin = 0;
int iEnd = 0;
if ((ErrorCode = this->GetLeftNumber(pExp, iOpPos, sVal1, sizeof(sVal1), &iValSz, &iBegin)) != ResultOk)
{
return ErrorCode;
}
if (iValSz > 0)
{
if ((ErrorCode = this->GetRightNumber(pExp, iOpPos + iOpSz, sVal2, sizeof(sVal2), &iValSz, &iEnd)) != ResultOk)
{
return ErrorCode;
}
if (iValSz > 0)
{
if (pInst->ForceIntegerMath)
{
double dLeft = atof(sVal1);
double dRight = atof(sVal2);
if(pInst->ForceUnsignedMath)
{
if (dLeft < 0 || dRight < 0)
{
return this->SetError(ResultMissingOperator, "Unsigned integer underflow.");
}
else if (dLeft > UINT_MAX || dRight > UINT_MAX)
{
return this->SetError(ResultMissingOperator, "unsigned integer overflow.");
}
}
else
{
if (dLeft < INT_MIN || dRight < INT_MIN)
{
return this->SetError(ResultIntegerunderflow, "Integer underflow.");
}
else if (dLeft > INT_MAX || dRight > INT_MAX)
{
return this->SetError(ResultIntegerOverflow, "Integer overflow.");
}
}
if ((ErrorCode = this->PerformDoubleOperation(pInst, atol(sVal1), sOp, atol(sVal2))) != ResultOk)
{
return ErrorCode;
}
if (pInst->RunningTotal < INT_MIN)
{
return this->SetError(ResultIntegerunderflow, "Integer underflow.");
}
else if (pInst->RunningTotal > INT_MAX)
{
return this->SetError(ResultIntegerOverflow, "Integer overflow.");
}
if (_itoa_s((int)pInst->RunningTotal, sVal, sizeof(sVal), 10) != 0)
{
return this->SetError(ResultIntegerTextConversionFailed, "Integer->Text converion failed.");
}
}
else {
if ((ErrorCode = this->PerformDoubleOperation(pInst, atof(sVal1), sOp, atof(sVal2))) != ResultOk)
{
return ErrorCode;
}
if (this->DoubleToChar(pInst->RunningTotal, sVal, sizeof(sVal)) <= 0)
{
return this->SetError(ResultDoubleTextConversionFailed, "Text->Double converion failed.");
}
}
iValSz = (int)strlen(sVal);
if (sVal[iValSz - 1] == '.')
{
iValSz--;
sVal[iValSz] = '\0';
}
if (this->cbDebugMode)
{
char sDebugMath[1024 + (_CVTBUFSIZE * 2)];
if (pInst->ForceIntegerMath)
{
sprintf_s(sDebugMath, sizeof(sDebugMath), "\t(%s %s %s) = %s\n", sVal1, sOp, sVal2, sVal);
if (this->pDebugProc)
{
this->pDebugProc(this, sDebugMath);
}
else {
printf("%s", sDebugMath);
}
}
else {
sprintf_s(sDebugMath, sizeof(sDebugMath), "\t(%.4f %s %.4f) = %.4f\n", atof(sVal1), sOp, atof(sVal2), atof(sVal));
if (this->pDebugProc)
{
this->pDebugProc(this, sDebugMath);
}
else {
printf("%s", sDebugMath);
}
}
}
if ((ErrorCode = this->ReplaceValue(pExp, iBegin, iEnd, sVal, iValSz)) != ResultOk)
{
return ErrorCode;
}
}
else {
return this->SetError(ResultRightValueFailed, "Value to the right of operator is missing or invalid.");
}
}
else {
if (strcmp(sOp, "!") == 0 || strcmp(sOp, "~") == 0)
{
if ((ErrorCode = this->GetRightNumber(pExp, iOpPos + iOpSz, sVal2, sizeof(sVal2), &iValSz, &iEnd)) != ResultOk)
{
return ErrorCode;
}
if (iValSz > 0)
{
if (sOp[0] == '!')
{
if ((ErrorCode = this->PerformBooleanOperation(pInst, atol(sVal2), sOp)) != ResultOk)
{
return ErrorCode;
}
}
else if (sOp[0] == '~')
{
if ((ErrorCode = this->PerformIntOperation(pInst, atol(sVal2), sOp, NULL)) != ResultOk)
{
return ErrorCode;
}
}
else {
return this->SetError(ResultInvalidOperator, "Invalid operator: %s.", sOp);
}
if (_itoa_s((int)pInst->RunningTotal, sVal, sizeof(sVal), 10) != 0)
{
return this->SetError(ResultIntegerTextConversionFailed, "Integer to text conversion failed.");
}
iValSz = (int)strlen(sVal);
if (this->cbDebugMode)
{
char sDebugMath[1024 + (_CVTBUFSIZE * 2)];
sprintf_s(sDebugMath, sizeof(sDebugMath), "\t%s%s%s = %s\n", sVal1, sOp, sVal2, sVal);
if (this->pDebugProc)
{
this->pDebugProc(this, sDebugMath);
}
else {
printf("%s", sDebugMath);
}
}
if ((ErrorCode = this->ReplaceValue(pExp, iBegin, iEnd, sVal, iValSz)) != ResultOk)
{
return ErrorCode;
}
}
else {
return this->SetError(ResultRightValueFailed, "Value to the right of operator is missing or invalid.");
}
}
else if (strcmp(sOp, "-") == 0)
{
return ResultFoundNegative;
}
else {
return this->SetError(ResultInvalidToken, "Invalid token: %s", sOp);
}
}
return ResultOk;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Returns the position of a free-standing not operator.
/// </summary>
/// <param name="pExp"></param>
/// <returns></returns>
int CMathParser::GetFreestandingNotOperation(MATHEXPRESSION *pExp) //Pre order.
{
for (int iRPos = 0; iRPos < pExp->Length; iRPos++)
{
//Make sure we have a "!' and not a "!=", these two have to be handled in different places.
if (pExp->Text[iRPos] == '!' && (iRPos + 1 < pExp->Length) && pExp->Text[iRPos + 1] != '=')
{
/*
//This is used to enforce the order of NOT expressions.
for(int iTmpRPos = iRPos + 1; iRPos < pExp->Length; iTmpRPos++)
{
if(!IsNumeric(pExp->Text[iTmpRPos]))
{
if(pExp->Text[iTmpRPos] != '(')
{
iRPos = iTmpRPos;
break;
}
}
}
if(pExp->Text[iRPos] == '~' || pExp->Text[iRPos] == '!')
{
return iRPos;
}
*/
return iRPos;
}
}
return -1;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Returns the first position of a first-order operation.
/// </summary>
/// <param name="pExp"></param>
/// <returns></returns>
int CMathParser::GetFirstOrderOperation(MATHEXPRESSION *pExp) //First order.
{
for (int iRPos = 1; iRPos < pExp->Length; iRPos++)
{
if (pExp->Text[iRPos] == '*' || pExp->Text[iRPos] == '/' || pExp->Text[iRPos] == '%' || pExp->Text[iRPos] == '~')
{
return iRPos;
}
}
return 0;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Returns the first position of a second-order operation.
/// </summary>
/// <param name="pExp"></param>
/// <param name="iStartPos"></param>
/// <returns></returns>
int CMathParser::GetSecondOrderOperation(MATHEXPRESSION *pExp, int iStartPos) //Second order.
{
for (int iRPos = iStartPos; iRPos < pExp->Length; iRPos++)
{
if (pExp->Text[iRPos] == '-' || pExp->Text[iRPos] == '+')
{
return iRPos;
}
}
return 0;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
CMathParser::MathResult CMathParser::CalculateSimpleExpression(MATHINSTANCE *pInst, MATHEXPRESSION *pSubExp)
{
MathResult ErrorCode = ResultOk;
int iDivPos = 0;
int iOpPos = 0;
int iOpSz = 0;
char *sOp = NULL;
int iRPos = 0;
int iWPos = 0;
int iBegin = 0;
int iEnd = 0;
int iOperator = 0;
pInst->RunningTotal = 0;
//Pre Order.
while ((iOpPos = this->GetFreestandingNotOperation(pSubExp)) >= 0)
{
iOpSz = 1;
if (pSubExp->Text[iOpPos] == '!')
{
sOp = "!";
}
else {
return this->SetError(ResultInvalidOperator, "Invalid operator: %c.", pSubExp->Text[iOpPos]);
}
if ((ErrorCode = this->ParseOperator(pInst, pSubExp, sOp, iOpPos, iOpSz)) != ResultOk)
{
return ErrorCode;
}
}
//First Order.
while ((iOpPos = this->GetFirstOrderOperation(pSubExp)) > 0)
{
iOpSz = 1;
if (pSubExp->Text[iOpPos] == '*') {
sOp = "*";
}
else if (pSubExp->Text[iOpPos] == '/') {
sOp = "/";
}
else if (pSubExp->Text[iOpPos] == '%') {
sOp = "%";
}
else if (pSubExp->Text[iOpPos] == '~') {
sOp = "~";
}
/*
else if(pSubExp->Text[iOpPos] == '!'){
sOp = "!";
}
*/
else {
return this->SetError(ResultInvalidOperator, "Invalid operator: %c.", pSubExp->Text[iOpPos]);
}
if ((ErrorCode = this->ParseOperator(pInst, pSubExp, sOp, iOpPos, iOpSz)) != ResultOk)
{
return ErrorCode;
}
}
int iStartPos = 1;
//Second Order.
while ((iOpPos = this->GetSecondOrderOperation(pSubExp, iStartPos)) > 0)
{
iOpSz = 1;
if (pSubExp->Text[iOpPos] == '-') {
sOp = "-";
}
else if (pSubExp->Text[iOpPos] == '+') {
sOp = "+";
}
else {
return this->SetError(ResultInvalidOperator, "Invalid operator: %c.", pSubExp->Text[iOpPos]);
}
if ((ErrorCode = this->ParseOperator(pInst, pSubExp, sOp, iOpPos, iOpSz)) != ResultOk)
{
if (ErrorCode == ResultFoundNegative)
{
iStartPos = iOpPos + 1;
}
else {
return ErrorCode;
}
}
}
for (iOperator = 0; sThirdOrder[iOperator]; iOperator++)
{
iOpSz = (int)strlen(sThirdOrder[iOperator]);
while ((iOpPos = InStr(sThirdOrder[iOperator], pSubExp->Text, pSubExp->Length, 0)) > 0)
{
if ((ErrorCode = this->ParseOperator(pInst, pSubExp, sThirdOrder[iOperator], iOpPos, iOpSz)) != ResultOk)
{
return ErrorCode;
}
}
}
if (IsNumeric(pSubExp->Text))
{
pInst->RunningTotal = atof(pSubExp->Text);
if (pInst->ForceIntegerMath)
{
if(pInst->ForceUnsignedMath)
{
if (pInst->RunningTotal < 0)
{
return this->SetError(ResultMissingOperator, "Unsigned integer underflow.");
}
else if (pInst->RunningTotal > UINT_MAX)
{
return this->SetError(ResultMissingOperator, "unsigned integer overflow.");
}
pInst->RunningTotal = (unsigned int)pInst->RunningTotal;
}
else
{
if (pInst->RunningTotal < INT_MIN)
{
return this->SetError(ResultMissingOperator, "Signed integer underflow.");
}
else if (pInst->RunningTotal > INT_MAX)
{
return this->SetError(ResultMissingOperator, "Signed integer overflow.");
}
pInst->RunningTotal = (int)pInst->RunningTotal;
}
}
}
else if (pSubExp->Text[0] == '!' && IsNumeric(pSubExp->Text + 1))
{
if (this->cbDebugMode)
{
char sDebugMath[1024 + (_CVTBUFSIZE * 2)];
sprintf_s(sDebugMath, sizeof(sDebugMath), "\t%s = %.4f\n", pSubExp->Text, pInst->RunningTotal);
if (this->pDebugProc)
{
this->pDebugProc(this, sDebugMath);
}
else {
printf("%s", sDebugMath);
}
}
if ((ErrorCode = this->PerformBooleanOperation(pInst, atol(pSubExp->Text + 1), "!")) != ResultOk)
{
return ErrorCode;
}
}
else if (pSubExp->Text[0] == '~' && IsNumeric(pSubExp->Text + 1))
{
if (this->cbDebugMode)
{
char sDebugMath[1024 + (_CVTBUFSIZE * 2)];
sprintf_s(sDebugMath, sizeof(sDebugMath), "\t%s = %.4f\n", pSubExp->Text, pInst->RunningTotal);
if (this->pDebugProc)
{
this->pDebugProc(this, sDebugMath);
}
else {
printf("%s", sDebugMath);
}
}
if ((ErrorCode = this->PerformIntOperation(pInst, atol(pSubExp->Text + 1), "~", NULL)) != ResultOk)
{
return ErrorCode;
}
}
else {
return this->SetError(ResultInvalidToken, "Invalid token: %c", pSubExp->Text[0]);
}
return ErrorCode;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Verifies that all parentheses have matches.
/// </summary>
/// <param name="sExpression"></param>
/// <param name="iExpressionSz"></param>
/// <returns></returns>
int CMathParser::MatchParentheses(const char *sExpression, const int iExpressionSz)
{
int iRPos = 0;
int iScope = 0;
while (iRPos < iExpressionSz)
{
if (sExpression[iRPos] == '(') {
iScope++;
}
else if (sExpression[iRPos] == ')') {
iScope--;
}
iRPos++;
}
return iScope;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
CMathParser::MathResult CMathParser::AllocateExpression(MATHEXPRESSION* pExp, const char* sSource, int iSourceSz)
{
pExp->Allocated = (int)iSourceSz + 1;
pExp->Text = (char*)calloc(sizeof(char), pExp->Allocated);
if (!pExp->Text)
{
return this->SetError(ResultMemoryAllocationError, "Memory allocation error.");
}
short LastChar = 0; // -1=Other 0=Not-Set 1=Numeric
bool bAfterWhiteSpace = false;
for (int iRPos = 0; iRPos < iSourceSz; iRPos++)
{
if (!IsWhiteSpace(sSource[iRPos]))
{
if (IsNumeric(sSource[iRPos]))
{
if (bAfterWhiteSpace)
{
if (LastChar != -1 && LastChar != 0)
{
return this->SetError(ResultInvalidToken, "Token is invalid: %c", sSource[iRPos]);
}
}
LastChar = 1;
}
else if (this->IsValidChar(sSource[iRPos]))
{
LastChar = -1;
}
else if (this->IsValidVariableChar(sSource[iRPos]))
{
//Parse variable name.
char sVarName[CMATHPARSER_MAX_VAR_LENGTH + 1];
int iVarWPos = 0;
while (this->IsValidVariableChar(sSource[iRPos]))
{
sVarName[iVarWPos++] = sSource[iRPos++];
if (iVarWPos >= CMATHPARSER_MAX_VAR_LENGTH)
{
return this->SetError(ResultInvalidToken, "Variable length limit exceeded.");
}
}
sVarName[iVarWPos] = '\0';
//Skip whitespaces.
while( iRPos < iSourceSz && IsWhiteSpace(sSource[iRPos]))
{
iRPos++;
}
if (sSource[iRPos] == '(')
{
double* pOutParameters = NULL;
int iParameterCount = 0;
double dProcValue = 0;
MathResult result = ResultOk;
if ((result = ParseMethodParameters(sSource, iSourceSz, &iRPos, &pOutParameters, &iParameterCount)) != ResultOk)
{
return result;
}
if (IsNativeMethod(sVarName))
{
if ((result = ExecuteNativeMethod(sVarName, pOutParameters, iParameterCount, &dProcValue)) != ResultOk)
{
return result;
}
}
else if (this->pMethodProc != NULL && this->pMethodProc(this, sVarName, pOutParameters, iParameterCount, &dProcValue))
{
//Non-native method executed successfully.
}
else
{
return this->SetError(ResultInvalidToken, "Undeclared identifier: %s.", sVarName);
}