Package kawa.standard

Class IfFeature

java.lang.Object

kawa.lang.Syntax

kawa.standard.IfFeature

All Implemented Interfaces:

gnu.kawa.format.Printable, Named

public class IfFeature
extends Syntax

Implements the Scheme 'cond-expand' syntax. Also provides various static methods relating to "features".

Field Summary

Fields

Modifier and Type	Field	Description
static SimpleSymbol	andSymbol
static IfFeature	condExpand
static SimpleSymbol	elseSymbol
static SimpleSymbol	librarySymbol
static SimpleSymbol	notSymbol
static SimpleSymbol	orSymbol
static String	PROVIDE_PREFIX

Constructor Summary

Constructors

Constructor	Description
IfFeature()

Method Summary

Modifier and Type	Method	Description
Object	evaluate(Object clauses, Translator tr)
boolean	evaluateCondition(Object form, Translator tr)
boolean	evaluateConditionCar(Pair pair, Translator tr)
static LList	featureList()	Return a (partial) list of features, The result does not include "provide" feature names - though it should.
static boolean	hasFeature(String name)	Check if we implement a named feature.
static boolean	isProvide(Declaration decl)
Expression	rewriteForm(Pair form, Translator tr)
void	scanForm(Pair st, ScopeExp defs, Translator tr)

Methods inherited from class kawa.lang.Syntax

getName, getSymbol, print, rewrite, scanForDefinitions, setName, setName

Methods inherited from class java.lang.Object

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

Field Detail

condExpand

public static final IfFeature condExpand

PROVIDE_PREFIX

public static final String PROVIDE_PREFIX

See Also:

Constant Field Values

andSymbol

public static final SimpleSymbol andSymbol

elseSymbol

public static final SimpleSymbol elseSymbol

librarySymbol

public static final SimpleSymbol librarySymbol

notSymbol

public static final SimpleSymbol notSymbol

orSymbol

public static final SimpleSymbol orSymbol

Constructor Detail

IfFeature

public IfFeature()

Method Detail

scanForm

public void scanForm(Pair st,
                     ScopeExp defs,
                     Translator tr)

Overrides:

scanForm in class Syntax

rewriteForm

public Expression rewriteForm(Pair form,
                              Translator tr)

Overrides:

rewriteForm in class Syntax

evaluateConditionCar

public boolean evaluateConditionCar(Pair pair,
                                    Translator tr)

evaluateCondition

public boolean evaluateCondition(Object form,
                                 Translator tr)

evaluate

public Object evaluate(Object clauses,
                       Translator tr)

hasFeature

public static boolean hasFeature(String name)

Check if we implement a named feature.

Parameters:

name - an interned feature name

featureList

public static LList featureList()

Return a (partial) list of features, The result does not include "provide" feature names - though it should. Feature names of the form class:CLASSNAME are not returned.

isProvide

public static boolean isProvide(Declaration decl)