QtxEvalSet Class Reference

Generic class for all the operations sets used in expressions.

#include <QtxEvalExpr.h>

Inheritance diagram for QtxEvalSet:

Public Member Functions
	QtxEvalSet ()
	Constructor.
virtual	~QtxEvalSet ()
	Destructor.
virtual QString	name () const =0
	Get unique operations set name.
virtual void	operationList (QStringList &) const =0
	Get the list of possible operations.
virtual void	bracketsList (QStringList &, bool open) const =0
	Get list of brackets.
virtual bool	createValue (const QString &, QVariant &) const
	Create value from its string representation.
virtual int	priority (const QString &, bool isBin) const =0
	Get the operation priority.
virtual QtxEvalExpr::Error	isValid (const QString &, const QVariant::Type, const QVariant::Type) const =0
	Check operation validity.
virtual QtxEvalExpr::Error	calculate (const QString &, QVariant &, QVariant &) const =0
	Calculate the operation.

---

Constructor & Destructor Documentation

QtxEvalSet::QtxEvalSet

(

)

QtxEvalSet::~QtxEvalSet

(

)

[virtual]

---

Member Function Documentation

QString QtxEvalSet::name

(

)

const [pure virtual]

Should be redefined in the successor classes.

Returns:

operations set name

Implemented in QtxEvalSetArithmetic, QtxEvalSetLogic, QtxEvalSetMath, QtxEvalSetString, QtxEvalSetSets, and QtxEvalSetConst.

void QtxEvalSet::operationList

(

QStringList &

list

)

const [pure virtual]

Parameters:

list	returning list of operations supported by the class

Implemented in QtxEvalSetBase, and QtxEvalSetConst.

void QtxEvalSet::bracketsList	(	QStringList &	list,
		bool	open
	)		const [pure virtual]

Parameters:

list	returning list of brackets
open	if true, collect opening brackets, or closing brackets otherwise

Implemented in QtxEvalSetBase, QtxEvalSetSets, and QtxEvalSetConst.

bool QtxEvalSet::createValue	(	const QString &	str,
		QVariant &	val
	)		const [virtual]

By default, the string value is set, that corresponds to the parameter. Base implementation always returns false (it means that string is evaluated to the parameter). Successor class can re-implement this method to return true if the argument being parsed can be evaluated as custom value.

Parameters:

str	string representration of the value
val	returning value

Returns:

true if str can be evaluated as custom value and false otherwise (parameter)

Reimplemented in QtxEvalSetArithmetic, QtxEvalSetLogic, QtxEvalSetMath, QtxEvalSetString, and QtxEvalSetConst.

int QtxEvalSet::priority	(	const QString &	op,
		bool	isBin
	)		const [pure virtual]

Operation priority counts from 1. If the operation is impossible, this function should return value <= 0.

Parameters:

op	operation
isBin	true if the operation is binary and false if it is unary

Returns:

operation priority

Implemented in QtxEvalSetArithmetic, QtxEvalSetLogic, QtxEvalSetMath, QtxEvalSetString, QtxEvalSetSets, and QtxEvalSetConst.

QtxEvalExpr::Error QtxEvalSet::isValid	(	const QString &	op,
		const QVariant::Type	t1,
		const QVariant::Type	t2
	)		const [pure virtual]

If the operation is valid, QtxEvalExpr.OK is returned. If types of operands are invalid, the function returns QtxEvalExpr.OperandsNotMatch or QtxEvalExpr.InvalidOperation.

Parameters:

op	operation
t1	first operand type
t2	second operand type

Returns:

error code (QtxEvalExpr.Error)

Implemented in QtxEvalSetBase, QtxEvalSetSets, and QtxEvalSetConst.

QtxEvalExpr::Error QtxEvalSet::calculate	(	const QString &	op,
		QVariant &	v1,
		QVariant &	v2
	)		const [pure virtual]

Process binary operation with values v1 and v2. For unary operation the is invalid. The result of the operation is returned in the parameter v1.

Parameters:

op	operation name
v1	first argument (not valid for unary prefix operations)
v2	second argument (not valid for unary postfix operations)

Returns:

error code (QtxEvalExpr.Error)

Implemented in QtxEvalSetArithmetic, QtxEvalSetLogic, QtxEvalSetMath, QtxEvalSetString, QtxEvalSetSets, and QtxEvalSetConst.