Module Simula

Package simula.compiler.syntaxClass.expression

Class UnaryOperation

java.lang.Object

simula.compiler.syntaxClass.SyntaxClass

simula.compiler.syntaxClass.expression.Expression

simula.compiler.syntaxClass.expression.UnaryOperation

final class UnaryOperation
extends Expression

Unary Operation.

 
 Syntax:
 
   unary-operation =  unary-operator  Expression
   
      unary-operator = NOT | + | -
 

Link to GitHub: Source File.

Author:

Øystein Myhre Andersen

Field Summary

Fields

Modifier and Type	Field	Description
(package private) Expression	operand	The operand Expression.
(package private) final KeyWord	oprator	The unary operator.

Fields inherited from class simula.compiler.syntaxClass.expression.Expression

backLink, type

Fields inherited from class simula.compiler.syntaxClass.SyntaxClass

lineNumber

Constructor Summary

Constructors

Modifier	Constructor	Description
private	UnaryOperation(KeyWord oprator, Expression operand)	Create a new UnaryOperation.

Method Summary

Modifier and Type	Method	Description
(package private) static Expression	create(KeyWord oprator, Expression operand)	Create a new UnaryOperation.
void	doChecking()	Perform semantic checking.
Expression	evaluate()	Try to Compile-time Evaluate this expression
boolean	maybeStatement()	Returns true if this expression may be used as a statement.
String	toJavaCode()	Generate Java code for this Syntax Class.
String	toString()

Methods inherited from class simula.compiler.syntaxClass.expression.Expression

acceptExpression, checkCompatibility, expectExpression, get, getInt, getNumber, getQualification, getWriteableVariable, printTree, put

Methods inherited from class simula.compiler.syntaxClass.SyntaxClass

ASSERT_SEMANTICS_CHECKED, doDeclarationCoding, doJavaCoding, edIndent, edTreeIndent, IS_SEMANTICS_CHECKED, print, SET_SEMANTICS_CHECKED

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

oprator

final KeyWord oprator

The unary operator.

operand

Expression operand

The operand Expression.

Constructor Details

UnaryOperation

private UnaryOperation(KeyWord oprator,
 Expression operand)

Create a new UnaryOperation.

Parameters:

oprator - the unary operator.

operand - the operand Expression

Method Details

create

static Expression create(KeyWord oprator,
 Expression operand)

Create a new UnaryOperation.

Parameters:

oprator - the unary operator.

operand - the operand Expression

Returns:

the newly created UnaryOperation

evaluate

public Expression evaluate()

Description copied from class: Expression

Try to Compile-time Evaluate this expression

Overrides:

evaluate in class Expression

Returns:

the resulting evaluated expression

doChecking

public void doChecking()

Description copied from class: SyntaxClass

Perform semantic checking.

This must be redefined in every subclass.

Overrides:

doChecking in class SyntaxClass

maybeStatement

public boolean maybeStatement()

Description copied from class: Expression

Returns true if this expression may be used as a statement.

Specified by:

maybeStatement in class Expression

Returns:

true if this expression may be used as a statement

toJavaCode

public String toJavaCode()

Description copied from class: SyntaxClass

Generate Java code for this Syntax Class.

Overrides:

toJavaCode in class SyntaxClass

Returns:

Java code

toString

public String toString()

Overrides:

toString in class Expression