QtxEvalSetBase Class Reference

Generic class. Provides functionality for standard operations sets.

#include <QtxEvalExpr.h>

Inheritance diagram for QtxEvalSetBase:

Public Member Functions
	QtxEvalSetBase ()
	Constructor.
virtual	~QtxEvalSetBase ()
	Destructor.
virtual void	operationList (QStringList &) const
	Get the list of possible operations.
virtual void	bracketsList (QStringList &, bool open) const
	Get list of brackets.
virtual QtxEvalExpr::Error	isValid (const QString &, const QVariant::Type, const QVariant::Type) const
	Check operation validity.
virtual QString	name () const =0
	Get unique operations set name.
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	calculate (const QString &, QVariant &, QVariant &) const =0
	Calculate the operation.
Protected Types
typedef QList< QVariant::Type >	ListOfTypes
Protected Member Functions
void	addTypes (const ListOfTypes &)
	Add operand types.
void	addOperations (const QStringList &)
	Add operation names to the internal list of operations.
Private Attributes
QStringList	myOpers
ListOfTypes	myTypes

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Member Typedef Documentation

typedef QList<QVariant::Type> QtxEvalSetBase.ListOfTypes [protected]

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Constructor & Destructor Documentation

QtxEvalSetBase::QtxEvalSetBase

(

)

QtxEvalSetBase::~QtxEvalSetBase

(

)

[virtual]

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Member Function Documentation

void QtxEvalSetBase::operationList

(

QStringList &

list

)

const [virtual]

Parameters:

list	returning list of operations supported by the class

Implements QtxEvalSet.

References myOpers.

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

Parameters:

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

Implements QtxEvalSet.

Reimplemented in QtxEvalSetSets.

QtxEvalExpr::Error QtxEvalSetBase::isValid	(	const QString &	op,
		const QVariant::Type	t1,
		const QVariant::Type	t2
	)		const [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)

Implements QtxEvalSet.

Reimplemented in QtxEvalSetSets.

References QtxEvalExpr.InvalidOperation, myTypes, QtxEvalExpr.OK, QtxEvalExpr.OperandsNotMatch, and QtxEvalSet.priority().

void QtxEvalSetBase::addTypes

(

const ListOfTypes &

list

)

[protected]

Parameters:

list	operand types to be added

References myTypes.

void QtxEvalSetBase::addOperations

(

const QStringList &

list

)

[protected]

Parameters:

list	operations to be added

References myOpers.

QString QtxEvalSet::name

(

)

const [pure virtual, inherited]

Should be redefined in the successor classes.

Returns:

operations set name

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

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

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, inherited]

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

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.

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Field Documentation

QStringList QtxEvalSetBase.myOpers [private]

ListOfTypes QtxEvalSetBase.myTypes [private]