ELAM::Expression Class Reference

Represents an expression in the context of its engine. More...

#include <elamexpression.h>

List of all members.

Public Types
enum	Type {   Literal = Token::Literal, Variable = Token::Variable, Constant = Token::Constant, Function = Token::Function,   Parentheses = Token::Parentheses, UnaryOp = Token::UnaryOp, BinaryOp = Token::BinaryOp, AssignmentOp = Token::AssignmentOp,   Exception = Token::IgnoredTokenMask }
Public Member Functions
	Expression ()
	creates and invalid expression, that always evaluates to an exception
	Expression (Engine *parent, const QList< Token > &tokens)
	creates an expression by its context engine and its tokens
QVariant	evaluate ()
	evaluates the expression and returns the result of the evaluation
Position	position () const
	returns the position of the main element of this expression
Friends
QDebug &	operator<< (QDebug, const Expression &)
	makes expressions accessable to qDebug()

---

Detailed Description

Represents an expression in the context of its engine.

An expression always has an engine as context and stores a hierarchy of operations (also expressions) to perform when called to evaluate. Expressions may become invalid if constants, functions, or operators change between the time they are created and the time they are evaluated.

---

Member Enumeration Documentation

enum ELAM::Expression::Type

Enumerator:

Literal
Variable
Constant
Function
Parentheses
UnaryOp
BinaryOp
AssignmentOp
Exception

---

Constructor & Destructor Documentation

ELAM::Expression::Expression

(

)

creates and invalid expression, that always evaluates to an exception

ELAM::Expression::Expression	(	Engine *	parent,
		const QList< Token > &	tokens
	)

creates an expression by its context engine and its tokens

---

Member Function Documentation

QVariant ELAM::Expression::evaluate

(

)

evaluates the expression and returns the result of the evaluation

Position ELAM::Expression::position

(

)

const

returns the position of the main element of this expression

---

Friends And Related Function Documentation

QDebug& operator<<	(	QDebug	,
		const Expression &
	)			[friend]

makes expressions accessable to qDebug()

---

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

• elamexpression.h