sisc.exprs

Class LexicalReferenceExp

java.lang.Object

sisc.util.Util

sisc.data.Expression

sisc.exprs.LexicalReferenceExp

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, Immediate, ExpressionVisitee, Version

public class LexicalReferenceExp
extends Expression
implements Immediate

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
int	idx

Fields inherited from class sisc.data.Expression

annotations, EMPTYSET

Fields inherited from class sisc.util.Util

BACKQUOTE, BEGIN, bundles, caseSensitive, EMPTYLIST, EMPTYVEC, EOF, ERRORK, EVAL, EXPSC, EXPTOP, FALSE, FCONT, FIVE, JEXCEPTION, LAMBDA, LOCATION, maxFloatPrecision, MESSAGE, minFloatPrecision, NAME, OTHER, PARENT, permitInterrupts, QUOTE, QUOTESYM, REPORT, SETBANG, SISC, SISC_SPECIFIC, SISCB, SOURCE_COLUMN, SOURCE_FILE, SOURCE_LINE, SYMENV, THIS, TOPLEVEL, TRUE, UNQUOTE, UNQUOTE_SPLICING, VOID, ZV

Fields inherited from interface sisc.util.Version

VERSION

Constructor Summary

Constructors

Constructor and Description
LexicalReferenceExp()
LexicalReferenceExp(int idx)

Method Summary

Methods

Modifier and Type	Method and Description
void	deserialize(Deserializer s) All Expressions must implement a default (no-argument) constructor.
boolean	equals(java.lang.Object o)
void	eval(Interpreter r) All expressions can be evaluated to some Scheme value.
Value	express() A debugging function, express returns a Scheme value that describes this expression.
Value	getValue(Interpreter r) If an expression implements the Immediate interface, it must override getValue, which returns as a Value, the immediate value of this expression.
int	hashCode()
void	serialize(Serializer s) All Expressions must implement a default (no-argument) constructor.

Methods inherited from class sisc.data.Expression

deserializeAnnotations, getAnnotation, getAnnotation, getAnnotationKeys, getAnnotations, getName, readExternal, readResolve, serializeAnnotations, setAnnotation, setAnnotation, setName, visit, visitAnnotations, writeExternal

Methods inherited from class sisc.util.Util

annotated, annotatedAppEval, append, argCheck, argsToSymbols, assq, bininport, bininstream, binoutport, binoutstream, box, character, charinport, charinreader, charoutport, charoutwriter, charsetFromString, chr, cont, currentClassLoader, env, error, error, error, error, error, error, error, expr, getDefaultCharacterSet, immutablePair, immutableVector, inport, javaExceptionToString, javaWrap, justify, length, liMessage, liMessage, liMessage, liMessage, liMessage, liMessage, liMessage, list, list, list, list, list, makeURL, mapcar, memq, nlib, num, outport, pair, pairToExpressions, pairToExpVect, pairToValues, proc, read, registerBundle, reverse, reverseInPlace, simpleErrorToString, sourceAnnotations, str, string, sym, symbol, symval, truePair, truth, truth, typeError, typeError, updateName, url, url, url, valArrayToList, valArrayToList, valArrayToVec, vec, warn, warn, warn

Methods inherited from class java.lang.Object

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

Field Detail

idx

public int idx

Constructor Detail

LexicalReferenceExp

public LexicalReferenceExp(int idx)

LexicalReferenceExp

public LexicalReferenceExp()

Method Detail

eval

public void eval(Interpreter r)
          throws ContinuationException

Description copied from class: Expression

All expressions can be evaluated to some Scheme value. This function implements the exact manner in which an expression is evaluated. An expression, when evaluated, performs some action that results in its value being placed in the acc register of the given Interpreter. An expression that immediately evaluates to a value (i.e. does not require that an additional expression be evaluated to obtain its value) must clear the nxp register by setting it to null. Otherwise, nxp should be set to the expression that is to be evaluated next before this method returns.

Specified by:

eval in class Expression

Parameters:

r - the Interpreter

Throws:

ContinuationException

getValue

public final Value getValue(Interpreter r)
                     throws ContinuationException

Description copied from class: Expression

If an expression implements the Immediate interface, it must override getValue, which returns as a Value, the immediate value of this expression.

Specified by:

getValue in interface Immediate

Overrides:

getValue in class Expression

Parameters:

r - the Interpreter

Returns:

the immediate value of this expression, or null if the value cannot be obtained immediately.

Throws:

ContinuationException

express

public Value express()

Description copied from class: Expression

A debugging function, express returns a Scheme value that describes this expression. See examples in sisc.exprs.*

Specified by:

express in class Expression

serialize

public void serialize(Serializer s)
               throws java.io.IOException

Description copied from class: Expression

All Expressions must implement a default (no-argument) constructor. Those that wish to be serialized to a heap must implement both this and the deserialize method. The Expression may use any method of the Serializer, which implements java.io.DataOutput to write its state.

Overrides:

serialize in class Expression

Parameters:

s - the Serializer

Throws:

java.io.IOException

deserialize

public void deserialize(Deserializer s)
                 throws java.io.IOException

Description copied from class: Expression

All Expressions must implement a default (no-argument) constructor. Those that wish to b serialized to a heap must implement both this and the serialize method. The Expression may use any method of the DataInput stream and the Deserializer serialization context to read its state.

Overrides:

deserialize in class Expression

Parameters:

s - the Deserializer

Throws:

java.io.IOException

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object