gnu.expr
Class ThisExp

java.lang.Object
  gnu.mapping.PropertySet
      gnu.mapping.Procedure
          gnu.mapping.Procedure0
              gnu.expr.Expression
                  gnu.expr.AccessExp
                      gnu.expr.ReferenceExp
                          gnu.expr.ThisExp

All Implemented Interfaces:

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

public class ThisExp
extends ReferenceExp

Evaluates to the "this" implicit variable. This is currently neither robust nor general. FIXME!

Field Summary

static java.lang.String

THIS_NAME Non-interned name for implicit 'this' variable.

Fields inherited from class gnu.expr.ReferenceExp

CREATE_FIELD_REFERENCE, DONT_DEREFERENCE, PREFER_BINDING2, PROCEDURE_NAME

Fields inherited from class gnu.expr.Expression

flags, NEXT_AVAIL_FLAG, noExpressions

Fields inherited from class gnu.mapping.PropertySet

nameKey

Constructor Summary

ThisExp()

ThisExp(ClassType type)

ThisExp(Declaration binding)

ThisExp(ScopeExp context)

Method Summary

void	apply(CallContext ctx) Evaluate the expression.
void	compile(Compilation comp, Target target)
ScopeExp	getContextScope()
Type	getType() Return the Type used to represent the values of this Expression.
boolean	isForContext() If this is being used to pass the context instance to a Macro.
static ThisExp	makeGivingContext(ScopeExp context)
protected Expression	walk(ExpWalker walker)

Methods inherited from class gnu.expr.ReferenceExp

getDontDereference, inline, isProcedureName, isUnknown, mustCompile, print, setDontDereference, setProcedureName, side_effects, toString

Methods inherited from class gnu.expr.AccessExp

contextDecl, getBinding, getName, getSimpleName, getSymbol, setBinding, setContextDecl, string_name

Methods inherited from class gnu.expr.Expression

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

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

getProperty, removeProperty, setName, setProperty, setProperty, setSymbol

Methods inherited from class java.lang.Object

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

Field Detail

THIS_NAME

public static final java.lang.String THIS_NAME

Non-interned name for implicit 'this' variable.

Constructor Detail

ThisExp

public ThisExp()

ThisExp

public ThisExp(ScopeExp context)

ThisExp

public ThisExp(Declaration binding)

ThisExp

public ThisExp(ClassType type)

Method Detail

isForContext

public final boolean isForContext()

If this is being used to pass the context instance to a Macro.

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 ReferenceExp

Throws:

java.lang.Throwable

getContextScope

public ScopeExp getContextScope()

makeGivingContext

public static ThisExp makeGivingContext(ScopeExp context)

compile

public void compile(Compilation comp,
                    Target target)

Overrides:

compile in class ReferenceExp

walk

protected Expression walk(ExpWalker walker)

Overrides:

walk in class ReferenceExp

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 ReferenceExp