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mp.cpp
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#include "mp.hpp"
// MathParser static member initialization
// Expected[Lexeme1][Lexeme2]=
// = true if Lexeme2 may follow Lexeme1,
// = false otherwise
constexpr bool MathParser::Expected[8][8]=
{
{false,
#ifdef MATH_PARSER_EMPTY_STRING_ALLOWED
true,
#else //MATH_PARSER_EMPTY_STRING_ALLOWED
false,
#endif //MATH_PARSER_EMPTY_STRING_ALLOWED
true, true, true, false, true, false},
{false, false, false, false, false, false, false, false},
{false, true, false, false, false, true, false, true},
{false, false, false, false, false, false, true, false},
{false, false, true, true, false, false, true, false},
{false, false, true, true, false, false, true, false},
{false, false, true, true, true, false, true, false},
{false, true, false, false, false, true, false, true}
};
MathParser::MathParser(bool case_sensitive) :
input_strings{}, user_vars{}, Stack{}, lexer_buffer{},
case_sensitive{ case_sensitive }, compiled_code{}, runtime_mem{},
iCommandCounter{ 0 }, iMemoryCounter{ 0 }, pCompiledCode{ nullptr }
{
}
MathParser::ErrorCodes MathParser::Parse(size_t& iErrorPosition, size_t iIndex)
{
size_t iFirstSymbol{ 0 };
try
{
if (iIndex >= input_strings.size()) throw WrongIndex;
const auto (*const pString) { input_strings[iIndex].data() };
auto (*const pBuffer) { lexer_buffer.data() };
size_t iCurrentPosition{ 0 }, iBufferPosition{};
MathLexeme CurrentLexeme{ MathLexeme::Begin }, PreviousLexeme{};
long long int iParBalance{ 0 };
do
GetLexCheckSyntax(
ParseMode,
iFirstSymbol,
pString,
pBuffer,
iCurrentPosition,
iBufferPosition,
CurrentLexeme,
PreviousLexeme,
iParBalance,
nullptr);
while (CurrentLexeme.iType != MathLexeme::End);
// Check if there've been enough right parentheses
if (iParBalance > 0) throw ExpectedRightPar;
// syntax OK!
iErrorPosition = iCurrentPosition;
return OK;
}//try
catch (const MathParser::ErrorCodes& iCaught)
{
iErrorPosition = iFirstSymbol;
return iCaught;
}
}
MathParser::ErrorCodes MathParser::Evaluate(
size_t& iErrorPosition, const vector<double>& args,
double& dValue, size_t iIndex)
{
size_t iFirstSymbol{ 0 };
try
{
if (iIndex >= input_strings.size()) throw WrongIndex;
const auto (*const pString) { input_strings[iIndex].data() };
auto (*const pBuffer) { lexer_buffer.data() };
size_t iCurrentPosition{ 0 }, iBufferPosition{};
MathLexeme CurrentLexeme{ MathLexeme::Begin }, PreviousLexeme{};
long long int iParBalance{ 0 };
const double* rgdArguments{ args.data() };
Stack.Push (CurrentLexeme);
do
{
GetLexCheckSyntax(
EvaluateMode,
iFirstSymbol,
pString,
pBuffer,
iCurrentPosition,
iBufferPosition,
CurrentLexeme,
PreviousLexeme,
iParBalance,
rgdArguments);
// Check if there've been enough right parentheses
if (CurrentLexeme.iType == MathLexeme::End)
if (iParBalance > 0) throw ExpectedRightPar;
// Now evaluate
switch (CurrentLexeme.iType)
{
case MathLexeme::Number:
case MathLexeme::LeftPar:
case MathLexeme::Function:
Stack.Push(CurrentLexeme);
break;
case MathLexeme::Binary:
{
bool fMore{ true };
do
{
const auto SecondFromTop = Stack.SecondFromTop();
switch (SecondFromTop.iType)
{
case MathLexeme::Begin:
case MathLexeme::LeftPar:
fMore = false;
break;
default:
// case MathLexeme::Binary:
if (MathLexeme::IsPriorityHigher
[SecondFromTop.iItem]
[CurrentLexeme.iItem])
{
iFirstSymbol = Stack.SecondFromTop().iPosition;
EvaluateBinaryOp();
}
else fMore = false;
} // switch
} while (fMore);
Stack.Push(CurrentLexeme);
} // case
break;
case MathLexeme::RightPar:
{
while (Stack.SecondFromTop().iType == MathLexeme::Binary)
{
iFirstSymbol = Stack.SecondFromTop().iPosition;
EvaluateBinaryOp();
}
MathLexeme Tmp;
Stack.Pop(Tmp);
Stack.Pop(); // remove '('
if (Stack.Top().iType == MathLexeme::Function)
{
Tmp.dValue = Stack.Top().pFunction(Tmp.dValue);
iFirstSymbol = Stack.Top().iPosition;
CheckForFloatingPointError(Tmp.dValue);
Stack.Pop(); // remove function
}
Stack.Push(Tmp);
}
break;
case MathLexeme::End:
while (Stack.SecondFromTop().iType == MathLexeme::Binary)
{
iFirstSymbol = Stack.SecondFromTop().iPosition;
EvaluateBinaryOp();
}
break;
default:
// case MathLexeme::Unary:
if (CurrentLexeme.iItem == MathLexeme::Minus)
{
Stack.Push(MathLexeme(MathLexeme::Number, MathLexeme::Constant, 0.0));
Stack.Push(MathLexeme(MathLexeme::Binary, MathLexeme::Minus));
}
} // switch
} // do
while (CurrentLexeme.iType != MathLexeme::End);
// syntax OK!
iErrorPosition = iCurrentPosition;
dValue = Stack.Top().dValue;
Stack.Reset();
return OK;
}//try
catch (const MathParser::ErrorCodes& iCaught)
{
iErrorPosition = iFirstSymbol;
Stack.Reset();
return iCaught;
}
}
MathParser::ErrorCodes MathParser::Compile(size_t& iErrorPosition, size_t iIndex)
{
size_t iFirstSymbol{ 0 };
try
{
if (iIndex >= input_strings.size()) throw WrongIndex;
const auto (*const pString) { input_strings[iIndex].data() };
auto (*const pBuffer) { lexer_buffer.data() };
size_t iCurrentPosition{ 0 }, iBufferPosition{};
MathLexeme CurrentLexeme{ MathLexeme::Begin }, PreviousLexeme{};
long long int iParBalance{ 0 };
pCompiledCode = compiled_code[iIndex].data();
iCommandCounter = 0; // will count commands produced by compiler
// Will count runtime memory used for storage of intermediate values.
// Values of user variables passed as arguments will be stored in the beginning.
// Memory won't be reused.
iMemoryCounter = NumberOfVars();
Stack.Push(CurrentLexeme);
do
{
GetLexCheckSyntax(
CompileMode,
iFirstSymbol,
pString,
pBuffer,
iCurrentPosition,
iBufferPosition,
CurrentLexeme,
PreviousLexeme,
iParBalance,
nullptr);
// Check if there've been enough right parentheses
if (CurrentLexeme.iType == MathLexeme::End)
if (iParBalance > 0) throw ExpectedRightPar;
// Now compile
switch (CurrentLexeme.iType)
{
case MathLexeme::Number:
case MathLexeme::LeftPar:
case MathLexeme::Function:
Stack.Push(CurrentLexeme);
break;
case MathLexeme::Binary:
{
bool fMore{ true };
do // unwind stack
{
const auto SecondFromTop = Stack.SecondFromTop();
switch (SecondFromTop.iType)
{
case MathLexeme::Begin:
case MathLexeme::LeftPar:
fMore = false;
break;
default:
// case MathLexeme::Binary:
if (MathLexeme::IsPriorityHigher
[SecondFromTop.iItem]
[CurrentLexeme.iItem])
{
iFirstSymbol = Stack.SecondFromTop().iPosition;
CompileBinaryOp();
}
else fMore = false;
} // switch
} while (fMore);
Stack.Push(CurrentLexeme);
} // case MathLexeme::Binary
break;
case MathLexeme::RightPar:
{
while (Stack.SecondFromTop().iType == MathLexeme::Binary)
{
iFirstSymbol = Stack.SecondFromTop().iPosition;
CompileBinaryOp();
}
MathLexeme Tmp;
Stack.Pop(Tmp);
Stack.Pop(); // remove '('
if (Stack.Top().iType == MathLexeme::Function)
{
if (Tmp.iItem == MathLexeme::Constant)
{
// argument of the function is known, no need to compile
Tmp.dValue = Stack.Top().pFunction(Tmp.dValue);
iFirstSymbol = Stack.Top().iPosition;
CheckForFloatingPointError(Tmp.dValue);
}
else
{
// argument of the function not known
pCompiledCode[iCommandCounter++].
CompiledCommand::CompiledCommand(Tmp.iRunTimeIndex, iMemoryCounter,
Stack.Top().pFunction, Stack.Top().iPosition);
Tmp.iRunTimeIndex = iMemoryCounter++;
}
Stack.Pop(); // remove function
}
Stack.Push(Tmp);
} //case MathLexeme::RightPar:
break;
case MathLexeme::End:
while (Stack.SecondFromTop().iType == MathLexeme::Binary)
{
iFirstSymbol = Stack.SecondFromTop().iPosition;
CompileBinaryOp();
}
break;
default:
// case MathLexeme::Unary:
if (CurrentLexeme.iItem == MathLexeme::Minus)
{
Stack.Push(MathLexeme(MathLexeme::Number, MathLexeme::Constant, 0.0));
Stack.Push(MathLexeme(MathLexeme::Binary, MathLexeme::Minus));
}
} // switch
} // do
while (CurrentLexeme.iType != MathLexeme::End);
// syntax OK!
iErrorPosition = iCurrentPosition;
if (Stack.Top().iItem == MathLexeme::Constant)
pCompiledCode[iCommandCounter++].
CompiledCommand::CompiledCommand(Stack.Top().dValue);
else
pCompiledCode[iCommandCounter++].
CompiledCommand::CompiledCommand(Stack.Top().iRunTimeIndex);
Stack.Reset();
return OK;
}//try
catch (const MathParser::ErrorCodes& iCaught)
{
iErrorPosition = iFirstSymbol;
Stack.Reset();
InvalidateCompiledCode(iIndex);
return iCaught;
}
}
MathParser::ErrorCodes MathParser::Execute(
size_t& iErrorPosition, const vector<double>& args, double& dValue, size_t iIndex)
{
auto (*pCmdPtr) { compiled_code[iIndex].data() };
auto (*const pMemPtr) { runtime_mem.data() };
memcpy(pMemPtr, args.data(), sizeof(double) * NumberOfVars());
loop:
if (pCmdPtr->fFlag1)
{
// mem+const or const+mem
auto iBinaryOp{ pCmdPtr->iBinaryOp };
if (pCmdPtr->fFlag2)
{
// mem+const
switch (iBinaryOp)
{
case MathLexeme::Plus:
pMemPtr[pCmdPtr->iResult] = pMemPtr[pCmdPtr->iFirstOperand] + pCmdPtr->dValue;
break;
case MathLexeme::Minus:
pMemPtr[pCmdPtr->iResult] = pMemPtr[pCmdPtr->iFirstOperand] - pCmdPtr->dValue;
break;
case MathLexeme::Multiply:
pMemPtr[pCmdPtr->iResult] = pMemPtr[pCmdPtr->iFirstOperand] * pCmdPtr->dValue;
break;
case MathLexeme::Divide:
pMemPtr[pCmdPtr->iResult] = pMemPtr[pCmdPtr->iFirstOperand] / pCmdPtr->dValue;
break;
default:
//case MathLexeme::Power:
pMemPtr[pCmdPtr->iResult] =
pow(pMemPtr[pCmdPtr->iFirstOperand], pCmdPtr->dValue);
}
}
else // fFlag2
{
// const+mem
switch (iBinaryOp)
{
case MathLexeme::Plus:
pMemPtr[pCmdPtr->iResult] = pCmdPtr->dValue + pMemPtr[pCmdPtr->iSecondOperand];
break;
case MathLexeme::Minus:
pMemPtr[pCmdPtr->iResult] = pCmdPtr->dValue - pMemPtr[pCmdPtr->iSecondOperand];
break;
case MathLexeme::Multiply:
pMemPtr[pCmdPtr->iResult] = pCmdPtr->dValue * pMemPtr[pCmdPtr->iSecondOperand];
break;
case MathLexeme::Divide:
pMemPtr[pCmdPtr->iResult] = pCmdPtr->dValue / pMemPtr[pCmdPtr->iSecondOperand];
break;
default:
//case MathLexeme::Power:
pMemPtr[pCmdPtr->iResult] =
pow(pCmdPtr->dValue, pMemPtr[pCmdPtr->iSecondOperand]);
}
}
}
else // fFlag1
{
if (pCmdPtr->fFlag2)
{
// mem+mem
auto iBinaryOp{ pCmdPtr->iBinaryOp };
switch (iBinaryOp)
{
case MathLexeme::Plus:
pMemPtr[pCmdPtr->iResult] =
pMemPtr[pCmdPtr->iFirstOperand] + pMemPtr[pCmdPtr->iSecondOperand];
break;
case MathLexeme::Minus:
pMemPtr[pCmdPtr->iResult] =
pMemPtr[pCmdPtr->iFirstOperand] - pMemPtr[pCmdPtr->iSecondOperand];
break;
case MathLexeme::Multiply:
pMemPtr[pCmdPtr->iResult] =
pMemPtr[pCmdPtr->iFirstOperand] * pMemPtr[pCmdPtr->iSecondOperand];
break;
case MathLexeme::Divide:
pMemPtr[pCmdPtr->iResult] =
pMemPtr[pCmdPtr->iFirstOperand] / pMemPtr[pCmdPtr->iSecondOperand];
break;
default:
//case MathLexeme::Power:
pMemPtr[pCmdPtr->iResult] =
pow(pMemPtr[pCmdPtr->iFirstOperand], pMemPtr[pCmdPtr->iSecondOperand]);
}
}
else // fFlag2
{
if (pCmdPtr->fFlag3)
{
// function call
pMemPtr[pCmdPtr->iResult] =
pCmdPtr->pFunction(pMemPtr[pCmdPtr->iFirstOperand]);
}
else // fFlag3
{
// termination
if (pCmdPtr->fResultInMemory)
{
dValue = pMemPtr[pCmdPtr->iFirstOperand];
return OK;
}
else
{
dValue = pCmdPtr->dValue;
return OK;
}
}
}
}
#ifdef MATH_PARSER_CHECK_FOR_FLOATING_POINT_ERRORS
if (!isfinite(pMemPtr[pCmdPtr->iResult]))
{
iErrorPosition = pCmdPtr->iErrorPosition;
if (isnan(pMemPtr[pCmdPtr->iResult]))
return FloatingPointErrorNaN;
else
if (pMemPtr[pCmdPtr->iResult] > 0)
return FloatingPointErrorPosInf;
else
return FloatingPointErrorNegInf;
}
#endif //MATH_PARSER_CHECK_FOR_FLOATING_POINT_ERRORS
++pCmdPtr;
goto loop;
}
void MathParser::InsertString(
wstring&& wstr, size_t requested_index, size_t& assigned_index)
{
if (requested_index >= input_strings.size()) requested_index = input_strings.size();
assigned_index = requested_index;
const auto str_len = wstr.size();
input_strings.insert(input_strings.begin() + requested_index, move(wstr));
// allocate memory for lexer
// the buffer is created, and allocates initial memory, when InsertString is called
// for the first time.
constexpr size_t min_buf_len = 128; // 1 == test value, to be increased
size_t required_buf_len{ str_len + 1 };
if (required_buf_len < min_buf_len) required_buf_len = min_buf_len;
if (lexer_buffer.size() < required_buf_len)
{
constexpr size_t buf_len_extra{ 128 }; // 0 == test value, to be increased
const auto current_buf_len = required_buf_len + buf_len_extra;
lexer_buffer.resize(current_buf_len);
}
// the stack is created when InsertString is called for the first time
// + adjust stack size when necessary
auto required_stack_size = str_len + 2; // was 2*iNewStringLength + 2
if (Stack.iCurrentStackSize < required_stack_size)
{
constexpr size_t stack_size_extra{ 128 }; // 0 == test value, to be increased
required_stack_size += stack_size_extra;
Stack.Resize(required_stack_size);
}
// allocate memory for compiled code
compiled_code.insert(
compiled_code.begin() + requested_index,
vector<CompiledCommand>(str_len + 2)
);
InvalidateCompiledCode(assigned_index);
// allocate/adjust memory for run-time data (arguments and intermediate storage)
AdjustRunTimeMem();
}
void MathParser::RemoveString(size_t iIndex)
{
input_strings.erase(input_strings.begin() + iIndex);
compiled_code.erase(compiled_code.begin() + iIndex);
}
size_t MathParser::TrimVarName(wstring& wstr)
{
auto str_len{ wstr.size() };
size_t it{ 0 };
for (; it < str_len; ++it)
if (wstr[it] != ' ' && wstr[it] != '\t')
break;
if (it > 0)
{
wstr.erase(0, it);
str_len = wstr.size();
}
if (str_len > 0)
{
it = str_len - 1;
while (wstr[it] == ' ' || wstr[it] == '\t') --it;
if (it < str_len - 1)
{
wstr.erase(it + 1);
str_len = wstr.size();
}
}
return str_len;
}
MathParser::ErrorCodes MathParser::CheckVar(const wstring& wstr) const
{
// check if wstr is a valid ID
if (!IsVarNameValid(wstr)) return InvalidIdentifier;
// check if in use
if (VarNameInUse(wstr.data())) return IdentifierInUse;
return OK;
}
MathParser::ErrorCodes MathParser::CheckAndInsertVar(
wstring&& wstr, size_t requested_index, size_t& assigned_index)
{
const auto err_code{ CheckVar(wstr) };
if (err_code != OK) return err_code;
if (requested_index >= user_vars.size())
requested_index = user_vars.size();
assigned_index = requested_index;
user_vars.insert(user_vars.begin() + requested_index, move(wstr));
AdjustRunTimeMem();
return OK;
}
void MathParser::RemoveVar(size_t iIndex)
{
user_vars.erase(user_vars.begin() + iIndex);
}
void MathParser::RemoveAllVars()
{
user_vars.clear();
}
bool MathParser::OKtoExecute(size_t iIndex) const
{
if (iIndex >= compiled_code.size()) return false;
const auto code = compiled_code[iIndex].data();
if (code == nullptr) return false; // never happens?
// check for error token
return !code->fFlag1 || !code->fFlag3;
}
bool MathParser::IsCaseSensitive() const { return case_sensitive; }
void MathParser::SetCaseSensitive(bool case_sensitive)
{
this->case_sensitive = case_sensitive;
}
bool MathParser::FunctionExists(const wchar_t* name, size_t* index) const
{
for (size_t it = 0; it < MathLexeme::MathLexNumberOfFunctions; ++it)
if (MathLexeme::IsFunctionAllowed[it])
if (mp_str_cmp(name, MathLexeme::FunctionID[it]) == 0)
{
if (index != nullptr) *index = it;
return true;
}
return false;
}
bool MathParser::ConstantExists(const wchar_t* name, size_t* index) const
{
for (size_t it = 0; it < MathLexeme::MathLexNumberOfConstants; ++it)
if (MathLexeme::IsConstantAllowed[it])
if (mp_str_cmp(name, MathLexeme::ConstantID[it]) == 0)
{
if (index != nullptr) *index = it;
return true;
}
return false;
}
bool MathParser::VariableExists(const wchar_t* name, size_t* index) const
{
for (size_t it = 0; it < user_vars.size(); ++it)
if (mp_str_cmp(name, user_vars[it].data()) == 0)
{
if (index != nullptr) *index = it;
return true;
}
return false;
}
bool MathParser::VarNameInUse(const wchar_t* name) const
{
return FunctionExists(name) || ConstantExists(name) || VariableExists(name);
}
bool MathParser::IsVarNameValid(const wstring& wstr)
{
const auto str_len{ wstr.size() };
if (str_len == 0) return false;
if (!IsFirstChar(wstr[0]))
return false;
else
for (size_t it = 1; it < str_len; ++it)
if (!IsNextChar(wstr[it]))
return false;
return true;
}
void MathParser::EvaluateBinaryOp()
{
MathLexeme Op1{}, Op2{}, Sign{};
Stack.Pop(Op2);
Stack.Pop(Sign);
Stack.Pop(Op1);
switch (Sign.iItem)
{
case MathLexeme::Plus:
Op1.dValue += Op2.dValue;
break;
case MathLexeme::Minus:
Op1.dValue -= Op2.dValue;
break;
case MathLexeme::Multiply:
Op1.dValue *= Op2.dValue;
break;
case MathLexeme::Divide:
Op1.dValue /= Op2.dValue;
break;
default:
// case MathLexeme :: Power
Op1.dValue = pow(Op1.dValue, Op2.dValue);
break;
}
CheckForFloatingPointError(Op1.dValue);
Stack.Push(Op1);
}
void MathParser::CheckForFloatingPointError(double value)
{
#ifdef MATH_PARSER_CHECK_FOR_FLOATING_POINT_ERRORS
if (!isfinite(value))
if (isnan(value))
throw FloatingPointErrorNaN;
else
if (value > 0)
throw FloatingPointErrorPosInf;
else
throw FloatingPointErrorNegInf;
#endif //MATH_PARSER_CHECK_FOR_FLOATING_POINT_ERRORS
}
void MathParser::GetLexCheckSyntax(
MathParser::LexerMode LexerMode,
size_t& iFirstSymbol,
const wchar_t* pString,
wchar_t* pBuffer,
size_t& iCurrentPosition,
size_t& iBufferPosition,
MathLexeme& CurrentLexeme,
MathLexeme& PreviousLexeme,
long long int& iParBalance,
const double* rgdArguments
)
{
PreviousLexeme = CurrentLexeme;
// skip blanks
size_t iFirstSpace = iCurrentPosition;
while (pString[iCurrentPosition] == ' ' ||
pString[iCurrentPosition] == '\t') ++iCurrentPosition;
iFirstSymbol = iCurrentPosition;
wchar_t cCurrentChar(pString[iCurrentPosition]);
switch (cCurrentChar)
{
// end of line
case '\0':
CurrentLexeme.iType = MathLexeme::End;
iFirstSymbol = iFirstSpace;
//--iCurrentPosition;
if (LexerMode != ParseMode)
if (PreviousLexeme.iType == MathLexeme::Begin)
Stack.Push(MathLexeme(MathLexeme::Number, MathLexeme::Constant, 0.0));
break;
// signs (assume now they are all binary; check for unary later)
case '+':
CurrentLexeme.iType = MathLexeme::Binary;
CurrentLexeme.iItem = MathLexeme::Plus;
CurrentLexeme.iPosition = iFirstSymbol;
break;
case '-':
CurrentLexeme.iType = MathLexeme::Binary;
CurrentLexeme.iItem = MathLexeme::Minus;
CurrentLexeme.iPosition = iFirstSymbol;
break;
case '*':
CurrentLexeme.iType = MathLexeme::Binary;
CurrentLexeme.iItem = MathLexeme::Multiply;
CurrentLexeme.iPosition = iFirstSymbol;
#ifdef MATH_PARSER_DOUBLE_ASTERISK_ALLOWED
if (pString[++iCurrentPosition] == '*')
CurrentLexeme.iItem = MathLexeme::Power;
else --iCurrentPosition;
#endif //MATH_PARSER_DOUBLE_ASTERISK_ALLOWED
break;
case '/':
#ifdef MATH_PARSER_COLON_ALLOWED
case ':':
#endif //MATH_PARSER_COLON_ALLOWED
CurrentLexeme.iType = MathLexeme::Binary;
CurrentLexeme.iItem = MathLexeme::Divide;
CurrentLexeme.iPosition = iFirstSymbol;
break;
case '^':
CurrentLexeme.iType = MathLexeme::Binary;
CurrentLexeme.iItem = MathLexeme::Power;
CurrentLexeme.iPosition = iFirstSymbol;
break;
// parentheses
case '(':
CurrentLexeme.iType = MathLexeme::LeftPar;
++iParBalance;
break;
case ')':
// check balance
if (iParBalance <= 0) throw ExtraRightPar;
CurrentLexeme.iType = MathLexeme::RightPar;
--iParBalance;
break;
// possibly number, variable or function
default:
if (cCurrentChar == '0' ||
(cCurrentChar >= '1' && cCurrentChar <= '9') ||
cCurrentChar == '.')
{
// possibly number
iBufferPosition = 0;
auto fExpFound{ false }, fPointFound{ false }, fSignFound{ false };
for ( ; ; )
{
cCurrentChar = pString[iCurrentPosition];
if ((cCurrentChar >= '1' && cCurrentChar <= '9') || cCurrentChar == '0')
pBuffer[iBufferPosition++] = pString[iCurrentPosition++];
else
if (cCurrentChar == 'e' || cCurrentChar == 'E')
{
if (fExpFound)
{
--iCurrentPosition;
break;
}
else
{
pBuffer[iBufferPosition++] = pString[iCurrentPosition++];
fExpFound = true;
}
}
else
if (cCurrentChar == '.')
{
if (fPointFound)
{
--iCurrentPosition;
break;
}
else
{
pBuffer[iBufferPosition++] = pString[iCurrentPosition++];
fPointFound = true;
}
}
else
if (cCurrentChar == '+' || cCurrentChar == '-')
{
// check whether +/- belongs to the exponent or next lexeme
if (pString[iCurrentPosition - 1] == 'e' ||
pString[iCurrentPosition - 1] == 'E')
{
if (fSignFound)
{
--iCurrentPosition;
break;
}
else
{
pBuffer[iBufferPosition++] = pString[iCurrentPosition++];
fSignFound = true;
}
}
else
{
--iCurrentPosition;
break;
}
}
else
{
--iCurrentPosition;
break;
}
} // for
// possibly got a number in pBuffer, check it
pBuffer[iBufferPosition] = '\0';
if (swscanf_s(pBuffer, L"%lf", &CurrentLexeme.dValue) == 1)
{
CurrentLexeme.iType = MathLexeme::Number;
CurrentLexeme.iItem = MathLexeme::Constant;
CurrentLexeme.iPosition = iFirstSymbol;//is this needed? - can be inf/NaN
// check here for inf/nan and throw floating point error
if (LexerMode != ParseMode)
CheckForFloatingPointError(CurrentLexeme.dValue);
}
else throw MathParser::InvalidNumber;
} // if