gnu.expr

Class BeginExp

java.lang.Object

gnu.mapping.PropertySet

gnu.mapping.Procedure

gnu.expr.Expression

gnu.expr.BeginExp

All Implemented Interfaces:

gnu.kawa.format.Printable, Named, javax.xml.transform.SourceLocator, org.xml.sax.Locator

public class BeginExp
extends Expression

This class represents a sequence of Expressions. The expressions are evaluated for their side-effects, and the value of the last Expression is the result. A BeginExp may optionally have "compilation options" which can be used to control various compile-time aspects of Kawa, such as warning messages.

Nested Class Summary

Nested classes/interfaces inherited from interface gnu.text.SourceLocator

SourceLocator.Simple

Field Summary

Fields inherited from class gnu.expr.Expression

applyMethodExpression, flags, NEXT_AVAIL_FLAG, noExpressions, type, VALIDATED

Fields inherited from class gnu.mapping.Procedure

applyMethodType, applyToConsumerDefault, applyToConsumerMethod, applyToObjectDefault, applyToObjectMethod, compilerKey, compilerXKey, inlineIfConstantSymbol, validateApplyKey, validateXApplyKey

Fields inherited from class gnu.mapping.PropertySet

nameKey

Constructor Summary

Constructors

Constructor and Description
BeginExp()
BeginExp(Expression[] ex)
BeginExp(Expression exp0, Expression exp1)

Method Summary

Modifier and Type	Method and Description
void	add(Expression exp)
void	apply(CallContext ctx) Evaluate the expression.
protected Type	calculateType()
static Expression	canonicalize(Expression exp) Simplifies BeginExp.
static Expression	canonicalize(Expression[] exps)
void	compile(Compilation comp, Target target)
int	getExpressionCount()
Expression[]	getExpressions()
protected boolean	mustCompile()
void	popOptions(Compilation comp)
void	print(gnu.kawa.io.OutPort out)
void	pushOptions(Compilation comp)
void	setCompileOptions(java.util.Vector options)
void	setExpressions(Expression[] exps)
protected <R,D> R	visit(ExpVisitor<R,D> visitor, D d)
protected <R,D> void	visitChildren(ExpVisitor<R,D> visitor, D d)

Methods inherited from class gnu.expr.Expression

applyMethodExpression, checkLiteralKeyword, compile, compile, compileWithPosition, compileWithPosition, deepCopy, deepCopy, deepCopy, deepCopy, eval, eval, getColumnNumber, getEndColumn, getEndLine, getFileName, getFlag, getFlags, getLineNumber, getPublicId, getStartColumn, getStartLine, getSystemId, getType, getTypeRaw, isSingleValue, isStableSourceLocation, makeWhile, maybeSetLine, neverReturns, numArgs, print, printLineColumn, setFile, setFlag, setFlag, setLine, setLine, setLine, setLine, setLine, setLocation, setType, side_effects, toString, validateApply, valueIfConstant

Methods inherited from class gnu.mapping.Procedure

apply0, apply1, apply2, apply3, apply4, applyL, applyN, applyToConsumerDefault, applyToObjectDefault, checkArgCount, checkBadCode, getApplyMethod, getApplyToConsumerMethod, getApplyToObjectMethod, getReturnType, getSetter, getSourceLocation, isSideEffectFree, lookupApplyHandle, maxArgs, maxArgs, minArgs, 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

BeginExp

public BeginExp()

BeginExp

public BeginExp(Expression[] ex)

BeginExp

public BeginExp(Expression exp0,
                Expression exp1)

Method Detail

canonicalize

public static final Expression canonicalize(Expression exp)

Simplifies BeginExp. (In the future, nested BeginExps may be "flattened" as well.)

canonicalize

public static final Expression canonicalize(Expression[] exps)

add

public final void add(Expression exp)

getExpressions

public final Expression[] getExpressions()

getExpressionCount

public final int getExpressionCount()

setExpressions

public final void setExpressions(Expression[] exps)

setCompileOptions

public void setCompileOptions(java.util.Vector options)

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

pushOptions

public void pushOptions(Compilation comp)

popOptions

public void popOptions(Compilation comp)

compile

public void compile(Compilation comp,
                    Target target)

Specified by:

compile in class Expression

visit

protected <R,D> R visit(ExpVisitor<R,D> visitor,
                        D d)

Overrides:

visit in class Expression

visitChildren

protected <R,D> void visitChildren(ExpVisitor<R,D> visitor,
                                   D d)

Overrides:

visitChildren in class Expression

print

public void print(gnu.kawa.io.OutPort out)

Specified by:

print in class Expression

calculateType

protected Type calculateType()

Overrides:

calculateType in class Expression