Module Simula

Package simula.compiler.syntaxClass.expression

Class RelationalOperation

java.lang.Object

simula.compiler.syntaxClass.SyntaxClass

simula.compiler.syntaxClass.expression.Expression

simula.compiler.syntaxClass.expression.RelationalOperation

public final class RelationalOperation
extends Expression

Relational Operation.

 
 Simula Standard: 3.3 Relations
 
 

Syntax used during Parsing:

 
   relational-operation = expression  relational-operator  expression
   
      relational-operator = value-relational-operator | reference-comparator
      
         value-relational-operator =  < | <= | = | >= | > | <>
         
         reference-comparator =  == | =/= 
 

Link to GitHub: Source File.

Author:

Øystein Myhre Andersen

Field Summary

Fields

Modifier and Type	Field	Description
private Expression	lhs	The left hand side
private final KeyWord	opr	The relational operation
private Expression	rhs	The right hand side

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

backLink, type

Fields inherited from class simula.compiler.syntaxClass.SyntaxClass

lineNumber

Constructor Summary

Constructors

Constructor	Description
RelationalOperation(Expression lhs, KeyWord opr, Expression rhs)	Create a new RelationalOperation.

Method Summary

Modifier and Type	Method	Description
void	doChecking()	Perform semantic checking.
private String	doCodeTextRefRelation()	Coding Utility: Code text reference relation
private String	doCodeTextValueRelation()	Coding Utility: Code text value relation
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, evaluate, 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

lhs

private Expression lhs

The left hand side

opr

private final KeyWord opr

The relational operation

rhs

private Expression rhs

The right hand side

Constructor Details

RelationalOperation

RelationalOperation(Expression lhs,
 KeyWord opr,
 Expression rhs)

Create a new RelationalOperation.

Parameters:

lhs - the left hand side

opr - the relation

rhs - the right hand side

Method Details

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

doCodeTextValueRelation

private String doCodeTextValueRelation()

Coding Utility: Code text value relation

Returns:

the resulting Java source code

doCodeTextRefRelation

private String doCodeTextRefRelation()

Coding Utility: Code text reference relation

Returns:

the resulting Java source code

toString

public String toString()

Overrides:

toString in class Expression