Generic class for all the operations sets used in expressions.

#include <QtxEvalExpr.h>

Inheritance diagram for QtxEvalSet:

Public Member Functions
	QtxEvalSet ()
	Constructor. More...

virtual	~QtxEvalSet ()
	Destructor. More...

virtual QString	name () const =0
	Get unique operations set name. More...

virtual void	operationList (QStringList &) const =0
	Get the list of possible operations. More...

virtual void	bracketsList (QStringList &, bool open) const =0
	Get list of brackets. More...

virtual bool	createValue (const QString &, QVariant &) const
	Create value from its string representation. More...

virtual int	priority (const QString &, bool isBin) const =0
	Get the operation priority. More...

virtual QtxEvalExpr::Error	isValid (const QString &, const QVariant::Type, const QVariant::Type) const =0
	Check operation validity. More...

virtual QtxEvalExpr::Error	calculate (const QString &, QVariant &, QVariant &) const =0
	Calculate the operation. More...

Constructor & Destructor Documentation

QtxEvalSet::QtxEvalSet ( )

QtxEvalSet::~QtxEvalSet ( )

virtual

Member Function Documentation

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 QtxEvalSetConst, QtxEvalSetSets, and QtxEvalSetBase.

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

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 QtxEvalSetConst, QtxEvalSetString, QtxEvalSetMath, QtxEvalSetLogic, and QtxEvalSetArithmetic.

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 QtxEvalSetConst, QtxEvalSetSets, and QtxEvalSetBase.

QString QtxEvalSet::name ( ) const

pure virtual

Should be redefined in the successor classes.

Returns: operations set name

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

void QtxEvalSet::operationList ( QStringList & list ) const

pure virtual

Parameters

list	returning list of operations supported by the class

Implemented in QtxEvalSetConst, and QtxEvalSetBase.

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

The documentation for this class was generated from the following files:

src/Qtx/QtxEvalExpr.h
src/Qtx/QtxEvalExpr.cxx

Public Member Functions

Constructor & Destructor Documentation

Member Function Documentation