de.uka.ilkd.key.java.expression

Class Operator

java.lang.Object

de.uka.ilkd.key.java.JavaSourceElement

de.uka.ilkd.key.java.JavaProgramElement

de.uka.ilkd.key.java.JavaNonTerminalProgramElement

de.uka.ilkd.key.java.expression.Operator

All Implemented Interfaces:

Expression, ExpressionContainer, ModelElement, NonTerminalProgramElement, ProgramElement, SourceElement, SVSubstitute

Direct Known Subclasses:

AllFields, AllObjects, Assignment, BinaryNot, BinaryOperator, ComparativeOperator, Conditional, DLEmbeddedExpression, LogicalAnd, LogicalNot, LogicalOr, Negative, ParenthesizedExpression, Positive, SeqGet, SeqIndexOf, SeqLength, SeqReverse, SeqSingleton, SeqSub, ShiftLeft, ShiftRight, Singleton, TypeOperator, UnsignedShiftRight

public abstract class Operator
extends JavaNonTerminalProgramElement
implements Expression, ExpressionContainer

Operator base class.

Author:

AL

Field Summary

Fields

Modifier and Type	Field and Description
protected ImmutableArray<Expression>	children Children.
static int	INFIX
static int	POSTFIX
static int	PREFIX Relative positioning of the operator.

Constructor Summary

Constructors

Constructor and Description
Operator()
Operator(Expression unaryChild) Operator.
Operator(Expression[] arguments) Operator.
Operator(Expression lhs, Expression rhs) Operator.
Operator(ExtList children) Constructor for the transformation of COMPOST ASTs to KeY.

Method Summary

Modifier and Type	Method and Description
ImmutableArray<Expression>	getArguments() return arguments
abstract int	getArity() getArity() == getASTchildren().size()
ProgramElement	getChildAt(int index) Returns the child at the specified index in this node's "virtual" child array
int	getChildCount() Returns the number of children of this node.
Expression	getExpressionAt(int index)
int	getExpressionCount() Get the number of expressions in this container.
SourceElement	getFirstElement() Finds the source element that occurs first in the source.
SourceElement	getFirstElementIncludingBlocks() Finds the source element that occurs first in the source.
abstract KeYJavaType	getKeYJavaType(Services javaServ, ExecutionContext ec) returns the KeYJavaType of an expression
SourceElement	getLastElement() Finds the source element that occurs last in the source.
abstract int	getNotation()
abstract int	getPrecedence() 0 is the "highest" precedence (obtained by parantheses), 13 the "lowest".
boolean	isLeftAssociative() Checks if this operator is left or right associative.
boolean	isToBeParenthesized()
static boolean	precedes(Operator a, Operator b)
java.lang.String	reuseSignature(Services services, ExecutionContext ec) overriden from JavaProgramElement.

Methods inherited from class de.uka.ilkd.key.java.JavaNonTerminalProgramElement

compatibleBlockSize, computeHashCode, equals, equalsModRenaming, getArrayPos, match, matchChildren

Methods inherited from class de.uka.ilkd.key.java.JavaProgramElement

getComments, hashCode, prettyPrint, prettyPrintMain

Methods inherited from class de.uka.ilkd.key.java.JavaSourceElement

getEndPosition, getParentClass, getPositionInfo, getRelativePosition, getStartPosition, setParentClass, toSource, toString, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface de.uka.ilkd.key.java.ProgramElement

getComments, match

Methods inherited from interface de.uka.ilkd.key.java.SourceElement

equalsModRenaming, getEndPosition, getPositionInfo, getRelativePosition, getStartPosition, prettyPrint, visit

Field Detail

children

protected final ImmutableArray<Expression> children

Children.

PREFIX

public static final int PREFIX

Relative positioning of the operator.

See Also:

Constant Field Values

INFIX

public static final int INFIX

See Also:

Constant Field Values

POSTFIX

public static final int POSTFIX

See Also:

Constant Field Values

Constructor Detail

Operator

public Operator()

Operator

public Operator(Expression lhs,
                Expression rhs)

Operator.

Parameters:

lhs - an expression.

rhs - an expression.

Operator

public Operator(ExtList children)

Constructor for the transformation of COMPOST ASTs to KeY.

Parameters:

children - the children of this AST element as KeY classes. In this case the order of the children is IMPORTANT. May contain: 2 of Expression (the first Expression as left hand side, the second as right hand side), Comments

Operator

public Operator(Expression unaryChild)

Operator.

Parameters:

unaryChild - an expression.

Operator

public Operator(Expression[] arguments)

Operator.

Parameters:

arguments - an array of expression.

Method Detail

getArity

public abstract int getArity()

getArity() == getASTchildren().size()

getPrecedence

public abstract int getPrecedence()

0 is the "highest" precedence (obtained by parantheses), 13 the "lowest".

precedes

public static boolean precedes(Operator a,
                               Operator b)

Returns:

true, if a has a higher priority (a lower precendence value) than b.

getNotation

public abstract int getNotation()

Returns:

INFIX, PREFIX, or POSTFIX.

isLeftAssociative

public boolean isLeftAssociative()

Checks if this operator is left or right associative. The associativity defines the order in which the arguments are evaluated (left-to-right or right-to-left). The default is left associative. Unary operators, assignments and conditionals are right associative.

Returns:

true, if the operator is left associative, false otherwise.

getFirstElement

public SourceElement getFirstElement()

Description copied from class: JavaSourceElement

Finds the source element that occurs first in the source. The default implementation returns this element, which is correct for all terminal program elements, and many non terminals such as statements and prefixed operators.

Specified by:

getFirstElement in interface SourceElement

Overrides:

getFirstElement in class JavaSourceElement

Returns:

the first source element in the syntactical representation of this element, may be equals to this element.

See Also:

JavaSourceElement.toSource(), JavaSourceElement.getStartPosition()

getFirstElementIncludingBlocks

public SourceElement getFirstElementIncludingBlocks()

Description copied from interface: SourceElement

Finds the source element that occurs first in the source.

Specified by:

getFirstElementIncludingBlocks in interface SourceElement

Overrides:

getFirstElementIncludingBlocks in class JavaSourceElement

Returns:

the first source element in the syntactical representation of this element, may be equals to this element.

See Also:

SourceElement.getStartPosition()

getLastElement

public SourceElement getLastElement()

Description copied from class: JavaSourceElement

Finds the source element that occurs last in the source. The default implementation returns this element, which is correct for all terminal program elements, and many non terminals such as statements and prefixed operators.

Specified by:

getLastElement in interface SourceElement

Overrides:

getLastElement in class JavaSourceElement

Returns:

the last source element in the syntactical representation of this element, may be equals to this element.

See Also:

JavaSourceElement.toSource(), JavaSourceElement.getEndPosition()

getChildCount

public int getChildCount()

Returns the number of children of this node.

Specified by:

getChildCount in interface NonTerminalProgramElement

Returns:

an int giving the number of children of this node

getChildAt

public ProgramElement getChildAt(int index)

Returns the child at the specified index in this node's "virtual" child array

Specified by:

getChildAt in interface NonTerminalProgramElement

Parameters:

index - an index into this node's "virtual" child array

Returns:

the program element at the given position

Throws:

java.lang.ArrayIndexOutOfBoundsException - if index is out of bounds

getExpressionCount

public int getExpressionCount()

Get the number of expressions in this container.

Specified by:

getExpressionCount in interface ExpressionContainer

Returns:

the number of expressions.

getExpressionAt

public Expression getExpressionAt(int index)

Specified by:

getExpressionAt in interface ExpressionContainer

getArguments

public ImmutableArray<Expression> getArguments()

return arguments

isToBeParenthesized

public boolean isToBeParenthesized()

reuseSignature

public java.lang.String reuseSignature(Services services,
                                       ExecutionContext ec)

overriden from JavaProgramElement.

Overrides:

reuseSignature in class JavaProgramElement

ec - TODO

getKeYJavaType

public abstract KeYJavaType getKeYJavaType(Services javaServ,
                                           ExecutionContext ec)

Description copied from interface: Expression

returns the KeYJavaType of an expression

Specified by:

getKeYJavaType in interface Expression