KisNumericParser Namespace Reference

the namespace contains functions to transform math expression written as QString in numbers. More...

Functions
int	parseIntegerMathExpr (QString const &expr, bool *noProblem=0)
	parse an expression to an int.
double	parseSimpleMathExpr (QString const &expr, bool *noProblem=0)
	parse an expression to a double.

Detailed Description

the namespace contains functions to transform math expression written as QString in numbers.

Computation is done in a recursive way, maybe not the most efficient way compared to infix to postfix conversion before parsing. (TODO: look if it need to be changed).

Function Documentation

parseIntegerMathExpr()

KRITAWIDGETUTILS_EXPORT int KisNumericParser::parseIntegerMathExpr	(	QString const &	expr,
		bool *	noProblem )

parse an expression to an int.

Parameters

expr	the expression to parse
noProblem	if provided, the value pointed to will be se to true is no problem appeared, false otherwise.

Returns

the numerical value the expression eval to (or 0 in case of error).

Definition at line 69 of file kis_num_parser.cpp.

{
 
    bool ok = true; //intermediate variable to pass by reference to the sublevel parser (if no pointer is provided).
 
    if (noProblem != nullptr) {
        return qRound(treatLevel1Int(expr, *noProblem));
    }
 
    return qRound(treatLevel1Int(expr, ok));
 
}

References treatLevel1Int().

parseSimpleMathExpr()

KRITAWIDGETUTILS_EXPORT double KisNumericParser::parseSimpleMathExpr	(	const QString &	expr,
		bool *	noProblem )

parse an expression to a double.

Parameters

expr	the expression to parse
noProblem	if provided, the value pointed to will be se to true is no problem appeared, false otherwise.

Returns

the numerical value the expression eval to (or 0 in case of error).

Definition at line 50 of file kis_num_parser.cpp.

{
 
    bool ok = true; //intermediate variable to pass by reference to the sublevel parser (if no pointer is provided).
 
    //then go down each 3 levels of operation priority.
    if (noProblem != nullptr) {
        return treatLevel1(expr, *noProblem);
    }
 
    return treatLevel1(expr, ok);
 
}

References treatLevel1().