gnu.expr
Class BlockExp

java.lang.Object
  gnu.mapping.PropertySet
      gnu.mapping.Procedure
          gnu.mapping.Procedure0
              gnu.expr.Expression
                  gnu.expr.BlockExp

All Implemented Interfaces:

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

public class BlockExp
extends Expression

Class used to implement a block that can be exited.

Field Summary

Fields inherited from class gnu.expr.Expression

flags, NEXT_AVAIL_FLAG, noExpressions

Constructor Summary

BlockExp()

Method Summary

void	apply(CallContext ctx) Evaluate the expression.
void	compile(Compilation comp, Target target)
protected boolean	mustCompile()
void	print(OutPort out)
void	setBody(Expression body)
void	setBody(Expression body, Expression exitBody)
protected Expression	walk(ExpWalker walker)
protected void	walkChildren(ExpWalker walker)

Methods inherited from class gnu.expr.Expression

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

Constructor Detail

BlockExp

public BlockExp()

Method Detail

setBody

public void setBody(Expression body)

setBody

public void setBody(Expression body,
                    Expression exitBody)

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

walk

protected Expression walk(ExpWalker walker)

Overrides:

walk in class Expression

walkChildren

protected void walkChildren(ExpWalker walker)

Overrides:

walkChildren in class Expression

print

public void print(OutPort out)

Specified by:

print in class Expression