Module Simula

Package simula.compiler.syntaxClass

Class SyntaxClass

java.lang.Object

simula.compiler.syntaxClass.SyntaxClass

Direct Known Subclasses:

Declaration, Expression, HiddenSpecification, ProtectedSpecification, Statement, Type

public abstract sealed class SyntaxClass
extends Object
permits Declaration, Statement, Expression, HiddenSpecification, ProtectedSpecification, Type

The class SyntaxClass.

The Simula syntax is formally defined in the Simula Standard. Some non-terminal symbols give rise to a Java class with almost the same name. They are all subclasses of the class SyntaxClass. The subclass hierarchy of the Syntax class is described below

            SyntaxClass
               HiddenSpecification 
               ProtectedSpecification 
               Type 
                  OverLoad
               Declaration
                  ArrayDeclaration 
                  DeclarationScope
                     BlockDeclaration
                        ClassDeclaration 
                           PrefixedBlockDeclaration
                           StandardClass
                        MaybeBlockDeclaration
                        ProcedureDeclaration 
                           StandardProcedure
                           SwitchDeclaration
                     ConnectionBlock 
                  ExternalDeclaration
                  Parameter 
                  SimpleVariableDeclaration 
                     LabelDeclaration 
                  VirtualMatch 
                  VirtualSpecification 
               Statement
                  ActivationStatement
                  BlockStatement
                  ConditionalStatement
                  ConnectionStatement
                  DummyStatement
                  ForStatement
                  GotoStatement
                  InnerStatement
                  LabeledStatement
                  ProgramModule
                  StandaloneExpression
                  SwitchStatement
                  WhileStatement
               Expression
                  ArithmeticExpression
                  AssignmentOperation
                  BooleanExpression
                  ConditionalExpression
                  Constant 
                  LocalObject
                  ObjectGenerator
                  ObjectRelation
                  QualifiedObject
                  RelationalOperation
                  RemoteVariable
                  TextExpression
                  TypeConversion
                  UnaryOperation
                  VariableExpression          
 

Link to GitHub: Source File.

Author:

Øystein Myhre Andersen

Field Summary

Fields

Modifier and Type	Field	Description
private boolean	CHECKED	Controls semantic checking.
int	lineNumber	The source line number

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	SyntaxClass()	Create a new SyntaxClass.

Method Summary

Modifier and Type	Method	Description
protected void	ASSERT_SEMANTICS_CHECKED()	Assert that semantic checking done.
void	doChecking()	Perform semantic checking.
void	doDeclarationCoding()	Output possible declaration code.
void	doJavaCoding()	Output Java code.
static String	edIndent(int indent)	Utility: Returns a number of blanks.
protected String	edTreeIndent(int indent)	Utility: Returns a number of blanks followed by qualification of this
protected boolean	IS_SEMANTICS_CHECKED()	Returns true if semantic checking is done.
void	print(int indent)	Utility print method.
void	printTree(int indent)	Utility print syntax tree method.
protected void	SET_SEMANTICS_CHECKED()	Set semantic checked.
String	toJavaCode()	Generate Java code for this Syntax Class.

Methods inherited from class java.lang.Object

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

Field Details

CHECKED

private boolean CHECKED

Controls semantic checking.

Set true when the method doChecking() has been completed.

lineNumber

public int lineNumber

The source line number

Constructor Details

SyntaxClass

protected SyntaxClass()

Create a new SyntaxClass.

Method Details

doChecking

public void doChecking()

Perform semantic checking.

This must be redefined in every subclass.

SET_SEMANTICS_CHECKED

protected void SET_SEMANTICS_CHECKED()

Set semantic checked.

Should be called from all doChecking methods to signal that semantic checking is done.

IS_SEMANTICS_CHECKED

protected boolean IS_SEMANTICS_CHECKED()

Returns true if semantic checking is done.

Returns:

true if semantic checking is done

ASSERT_SEMANTICS_CHECKED

protected void ASSERT_SEMANTICS_CHECKED()

Assert that semantic checking done.

doDeclarationCoding

public void doDeclarationCoding()

Output possible declaration code.

doJavaCoding

public void doJavaCoding()

Output Java code.

toJavaCode

public String toJavaCode()

Generate Java code for this Syntax Class.

Returns:

Java code

print

public void print(int indent)

Utility print method.

Parameters:

indent - number of spaces leading the line

printTree

public void printTree(int indent)

Utility print syntax tree method.

Parameters:

indent - number of spaces leading the lines

edTreeIndent

protected String edTreeIndent(int indent)

Utility: Returns a number of blanks followed by qualification of this

Parameters:

indent - the number of blanks requested

Returns:

the resulting string

edIndent

public static String edIndent(int indent)

Utility: Returns a number of blanks.

Parameters:

indent - the number of blanks requested

Returns:

a number of blanks.