void EXParser::findAndReplaceVariables(std::string &_expression, EXVariableSet &_variables)
{
for(EXVariableSet::iterator vIter = _variables.begin(); vIter!=_variables.end(); ++vIter){
size_t j, start_index = 0;
for(; (j = _expression.find(vIter->first, start_index))!=std::string::npos;){
bool is_var = true;
if((int)(j+vIter->first.length())<_expression.length()){
if(isalpha(_expression.at((int)j+vIter->first.length()))){
is_var = false;
}
}
if((int)(j-1)>0){
if(isalpha(_expression.at((int)(j-1)))){
is_var = false;;
}
}
if(is_var){
_expression.replace(j, vIter->first.length(), dblToStr(vIter->second));
}
else{
start_index = j+vIter->first.length();
}
}
}
}
void EXParser::evaluateFormula(std::string &_expression, const int index, EXFormulaSet::iterator foiter)
{
EXVariableSet formulaVariables;
std::vector<std::string> formulaVariableNames, formulaVariableValues;
std::string formulaParameters = isolateParenthesisExpression(_expression, index),
formulaExpression = foiter->second, token;
int formulaParamLen = formulaParameters.length();
priorityLoop(formulaParameters);
splitString(formulaVariableNames, foiter->third);
splitString(formulaVariableValues, formulaParameters);
if(formulaVariableNames.size()!=formulaVariableValues.size()){
throw EXError("formula_parameter_error", ErrorIndex::FORMULA_PARAMETER_ERROR);
}
for(int i=0; i<formulaVariableNames.size(); i++){
formulaVariables.push_back(EXVariable(formulaVariableNames.at(i), atof(formulaVariableValues.at(i).c_str())));
}
findAndReplaceVariables(formulaExpression, formulaVariables);
_expression.replace(index-foiter->first.length(), foiter->first.length()+formulaParamLen+2, formulaExpression);
}
bool EXParser::evaluateFormula(std::string &_expression, const int index, EXFormulaSet::iterator foiter)
{
EXVariableSet formulaVariables;
std::vector<std::string> formulaVariableNames, formulaVariableValues;
std::string formulaParameters = isolateParenthesisExpression(_expression, index),
formulaExpression = foiter->second, token;
int formulaParamLen = formulaParameters.length();
priorityLoop(formulaParameters);
splitString(formulaVariableNames, foiter->third);
splitString(formulaVariableValues, formulaParameters);
if(formulaVariableNames.size()!=formulaVariableValues.size()){
mErrorStr = "formula parameter error";
return false;
}
for(unsigned int i=0; i<formulaVariableNames.size(); i++){
formulaVariables.push_back(EXVariable(formulaVariableNames.at(i), atof(formulaVariableValues.at(i).c_str())));
}
findAndReplaceVariables(formulaExpression, formulaVariables);
_expression.replace(index-foiter->first.length(), foiter->first.length()+formulaParamLen+2, formulaExpression);
return true;
}
