gnu.expr
Class LetExp

java.lang.Object
  gnu.mapping.PropertySet
      gnu.mapping.Procedure
          gnu.mapping.Procedure0
              gnu.expr.Expression
                  gnu.expr.ScopeExp
                      gnu.expr.LetExp

All Implemented Interfaces:

Named, Printable, SourceLocator, org.xml.sax.Locator

Direct Known Subclasses:

FluidLetExp, PatternScope, TemplateScope

public class LetExp
extends ScopeExp

Class used to implement "let" syntax (and variants) for Scheme.

Field Summary

Expression	body
Expression[]	inits

Fields inherited from class gnu.expr.ScopeExp

frameSize, id, outer

Fields inherited from class gnu.expr.Expression

flags, NEXT_AVAIL_FLAG, noExpressions

Constructor Summary

LetExp(Expression[] i)

Method Summary

void	apply(CallContext ctx) Evaluate the expression.
void	compile(Compilation comp, Target target)
Expression	getBody()
Type	getType() Return the Type used to represent the values of this Expression.
protected boolean	mustCompile()
void	print(OutPort out)
void	print(OutPort out, java.lang.String startTag, java.lang.String endTag)
void	setBody(Expression body)
protected Expression	walk(ExpWalker walker)
protected void	walkChildren(ExpWalker walker)
void	walkInitializers(ExpWalker walker)

Methods inherited from class gnu.expr.ScopeExp

add, add, addDeclaration, addDeclaration, addDeclaration, countDecls, currentLambda, currentModule, duplicateDeclarationError, firstDecl, getDefine, getNoDefine, getVarScope, lookup, lookup, nesting, popScope, remove, remove, replaceFollowing, setIndexes, toString

Methods inherited from class gnu.expr.Expression

apply0, compile, compile, compileButFirst, compileNotePosition, compileWithPosition, compileWithPosition, eval, eval, getColumnNumber, getFileName, getFlag, getFlags, getLineNumber, getPublicId, getSystemId, inline, isStableSourceLocation, makeWhile, match0, print, printLineColumn, setFile, setFlag, setFlag, setLine, setLine, setLine, setLine, setLocation, side_effects, valueIfConstant

Methods inherited from class gnu.mapping.Procedure0

apply1, apply2, apply3, apply4, applyN, numArgs

Methods inherited from class gnu.mapping.Procedure

apply, check0, check1, check2, check3, check4, checkArgCount, checkN, getSetter, getSourceLocation, match1, match2, match3, match4, matchN, maxArgs, minArgs, set0, set1, setN, setSetter, setSourceLocation

Methods inherited from class gnu.mapping.PropertySet

getName, getProperty, getSymbol, removeProperty, setName, setProperty, setProperty, setSymbol

Methods inherited from class java.lang.Object

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

Field Detail

inits

public Expression[] inits

body

public Expression body

Constructor Detail

LetExp

public LetExp(Expression[] i)

Method Detail

getBody

public Expression getBody()

setBody

public void setBody(Expression body)

mustCompile

protected boolean mustCompile()

Specified by:

mustCompile in class Expression

apply

public void apply(CallContext ctx)
           throws java.lang.Throwable

Description copied from class: Expression

Evaluate the expression. This is named apply rather than eval so it is compatible with the full-tail-call calling convention, and we can stash an Expression in CallContext's proc field. FIXME - are we making use of this?

Overrides:

apply in class Expression

Throws:

java.lang.Throwable

compile

public void compile(Compilation comp,
                    Target target)

Specified by:

compile in class Expression

getType

public final Type getType()

Description copied from class: Expression

Return the Type used to represent the values of this Expression.

Overrides:

getType in class Expression

walk

protected Expression walk(ExpWalker walker)

Overrides:

walk in class ScopeExp

walkInitializers

public void walkInitializers(ExpWalker walker)

walkChildren

protected void walkChildren(ExpWalker walker)

Overrides:

walkChildren in class Expression

print

public void print(OutPort out)

Specified by:

print in class Expression

print

public void print(OutPort out,
                  java.lang.String startTag,
                  java.lang.String endTag)