Class ConditionalExpression

java.lang.Object

simula.compiler.syntaxClass.SyntaxClass

simula.compiler.syntaxClass.expression.Expression

simula.compiler.syntaxClass.expression.ConditionalExpression

public final class ConditionalExpression
extends Expression

Conditional Expression.

Syntax: 

  conditional-expression
      = IF Boolean-expression THEN simple-expression ELSE expression

Link to GitHub: Source File.

Author:

Øystein Myhre Andersen

Field Summary

Fields

Modifier and Type	Field	Description
(package private) Expression	condition	The condition.
(package private) Expression	elseExpression	The else branch expression
(package private) Expression	thenExpression	The then branch expression

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

backLink, type

Fields inherited from class simula.compiler.syntaxClass.SyntaxClass

CHECKED, lineNumber, OBJECT_SEQU

Constructor Summary

Constructors

Modifier	Constructor	Description
private	ConditionalExpression()	Default constructor used by Attribute File I/O
(package private)	ConditionalExpression(Type type, Expression condition, Expression thenExpression, Expression elseExpression)	Create a new ConditionalExpression.

Method Summary

Modifier and Type	Method	Description
void	buildEvaluation(Expression rightPart, CodeBuilder codeBuilder)	ClassFile coding utility: Build Evaluation Code.
void	doChecking()	Perform semantic checking.
boolean	maybeStatement()	Returns true if this expression may be used as a statement.
static ConditionalExpression	readObject(AttributeInputStream inpt)	Read and return a ConditionalExpression.
String	toJavaCode()	Generate Java code for this Syntax Class.
String	toString()
void	writeObject(AttributeOutputStream oupt)	Write a SyntaxClass object to a AttributeOutputStream.

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, buildByteCode, doDeclarationCoding, doJavaCoding, edIndent, edTreeIndent, IS_SEMANTICS_CHECKED, print, SET_SEMANTICS_CHECKED, setLineNumber

Methods inherited from class java.lang.Object

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

Field Details

condition

Expression condition

The condition.

thenExpression

Expression thenExpression

The then branch expression

elseExpression

Expression elseExpression

The else branch expression

Constructor Details

ConditionalExpression

ConditionalExpression(Type type,
 Expression condition,
 Expression thenExpression,
 Expression elseExpression)

Create a new ConditionalExpression.

Parameters:

type - expression's type

condition - the condition

thenExpression - then branch expression

elseExpression - else branch expression

ConditionalExpression

private ConditionalExpression()

Default constructor used by Attribute File I/O

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

buildEvaluation

public void buildEvaluation(Expression rightPart,
 CodeBuilder codeBuilder)

Description copied from class: Expression

ClassFile coding utility: Build Evaluation Code.

Specified by:

buildEvaluation in class Expression

Parameters:

rightPart - expression

codeBuilder - the codeBuilder used.

toString

public String toString()

Overrides:

toString in class Expression

writeObject

public void writeObject(AttributeOutputStream oupt)
                 throws IOException

Description copied from class: SyntaxClass

Write a SyntaxClass object to a AttributeOutputStream.

Overrides:

writeObject in class SyntaxClass

Parameters:

oupt - the AttributeOutputStream to write to.

Throws:

IOException - if something went wrong.

readObject

public static ConditionalExpression readObject(AttributeInputStream inpt)
                                        throws IOException

Read and return a ConditionalExpression.

Parameters:

inpt - the AttributeInputStream to read from

Returns:

the ConditionalExpression read from the stream.

Throws:

IOException - if something went wrong.