//-----------------------------------------------------------------------------
// Function: IPXactValueParser::parseExpression()
//-----------------------------------------------------------------------------
QString IPXactValueParser::parseExpression(QString const& expression) const
{
QString format = getFormatForExpression(expression);
if ((format == "bool" || format == "string" || format.isEmpty()) &&
isValidExpression(expression, format))
{
return expression;
}
return QString::number(parseConstant(expression, format));
}
QString QgsFieldExpressionWidget::currentField( bool *isExpression, bool *isValid ) const
{
QString text = currentText();
if ( isValid )
{
*isValid = isValidExpression();
}
if ( isExpression )
{
*isExpression = this->isExpression();
}
return text;
}
QString QgsFieldExpressionWidget::currentField( bool *isExpression, bool *isValid ) const
{
QString text = currentText();
bool valueIsExpression = this->isExpression();
if ( isValid )
{
// valid if not an expression (ie, set to a field), or set to an expression and expression is valid
*isValid = !valueIsExpression || isValidExpression();
}
if ( isExpression )
{
*isExpression = valueIsExpression;
}
return text;
}
char* convertToReversedPolish(char* expression) {
if(!isValidExpression(expression))
return NULL;
stack<char*> operators_stack;
char* converted = new char[getReversedPolishExpressionSize(expression)];
strcpy(converted, "");
for(char* i = expression; *i; i++) {
//ignore multi-chars operators' 2nd char onwards
if(*i == '>' || (*i == '-' && *(i - 1) == '<'))
continue;
int code = getCodeName(i);
if(code == 0) {
strncat(converted, i, 1);
continue;
}
if(code == 6) {
pushCharToStack(i, operators_stack);
continue;
}
if(code == 7) {
while(*operators_stack.top() != '(') {
popStackToResult(converted, operators_stack);
}
//pop the '(' char
operators_stack.pop();
continue;
}
if(operators_stack.empty()) {
pushCharToStack(i, operators_stack);
continue;
}
else if(*operators_stack.top() != '(')
popStackToResult(converted, operators_stack);
pushCharToStack(i, operators_stack);
}
while(!operators_stack.empty())
popStackToResult(converted, operators_stack);
return converted;
}
void QgsFieldExpressionWidget::expressionEdited( const QString& expression )
{
updateLineEditStyle( expression );
emit fieldChanged( expression, isValidExpression() );
}
