sisc.exprs
Class EvalExp

java.lang.Object
  extended by sisc.util.Util
      extended by sisc.data.Expression
          extended by sisc.exprs.EvalExp
All Implemented Interfaces:
java.io.Externalizable, java.io.Serializable, OptimisticHost, ExpressionVisitee, Version

public class EvalExp
extends Expression
implements OptimisticHost

See Also:
Serialized Form

Field Summary
static int POS_POST
           
static int POS_PRE
           
 Expression post
           
 Expression pre
           
 boolean preImmediate
           
 
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
EvalExp()
           
EvalExp(Expression pre, Expression post, boolean preImmediate)
           
 
Method Summary
 void alter(Interpreter r, int uexpPosition, Expression replaceWith)
          Instructs the host to replace the uExp referenced at the given (Expression dependent) position, with the given Expression.
 void deserialize(Deserializer s)
          All Expressions must implement a default (no-argument) constructor.
 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.
 void serialize(Serializer s)
          All Expressions must implement a default (no-argument) constructor.
 void setHosts()
           
 boolean visit(ExpressionVisitor v)
           
 
Methods inherited from class sisc.data.Expression
deserializeAnnotations, getAnnotation, getAnnotation, getAnnotationKeys, getAnnotations, getName, getValue, readExternal, readResolve, serializeAnnotations, setAnnotation, setAnnotation, setName, 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, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

POS_PRE

public static final int POS_PRE
See Also:
Constant Field Values

POS_POST

public static final int POS_POST
See Also:
Constant Field Values

pre

public Expression pre

post

public Expression post

preImmediate

public boolean preImmediate
Constructor Detail

EvalExp

public EvalExp(Expression pre,
               Expression post,
               boolean preImmediate)

EvalExp

public EvalExp()
Method Detail

setHosts

public void setHosts()
Specified by:
setHosts in interface OptimisticHost

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

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

visit

public boolean visit(ExpressionVisitor v)
Specified by:
visit in interface ExpressionVisitee
Overrides:
visit in class Expression

alter

public void alter(Interpreter r,
                  int uexpPosition,
                  Expression replaceWith)
Description copied from interface: OptimisticHost
Instructs the host to replace the uExp referenced at the given (Expression dependent) position, with the given Expression.

Specified by:
alter in interface OptimisticHost
uexpPosition - Expression dependent uExp index
replaceWith - Expression to revert to