gnu.expr
Class BeginExp

java.lang.Object
  gnu.mapping.Procedure
      gnu.mapping.Procedure0
          gnu.expr.Expression
              gnu.expr.BeginExp

All Implemented Interfaces:

Named, Printable

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.

Field Summary

Fields inherited from class gnu.expr.Expression

flags, NEXT_AVAIL_FLAG, noExpressions

Constructor Summary

BeginExp()

BeginExp(Expression[] ex)

BeginExp(Expression exp0, Expression exp1)

Method Summary

void	add(Expression exp)
void	apply(CallContext ctx) Call this Procedure using the explicit-CallContext-convention.
static Expression	canonicalize(Expression exp) Simplifies BeginExp.
static Expression	canonicalize(Expression[] exps)
void	compile(Compilation comp, Target target)
java.lang.Object	eval(Environment env)
Expression[]	getExpressions()
Type	getType() Return the Type used to represent the values of this Expression.
void	popOptions(Compilation comp)
void	print(OutPort out)
void	pushOptions(Compilation comp)
void	setCompileOptions(java.util.Vector options)
void	setExpressions(Expression[] exps)
protected Expression	walk(ExpWalker walker)
protected void	walkChildren(ExpWalker walker)

Methods inherited from class gnu.expr.Expression

apply0, compile, compileButFirst, compileNotePosition, compileWithPosition, compileWithPosition, eval, getColumn, getFile, getFlag, getFlags, getLine, makeWhile, match0, print, printLineColumn, setFile, setFlag, setFlag, setLine, setLine, setLine, setLine

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, getName, getProperty, getSetter, getSymbol, match1, match2, match3, match4, matchN, maxArgs, minArgs, name, removeProperty, set0, set1, setN, setName, setProperty, setProperty, setSetter, setSymbol, toString

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()

setExpressions

public final void setExpressions(Expression[] exps)

setCompileOptions

public void setCompileOptions(java.util.Vector options)

eval

public java.lang.Object eval(Environment env)
                      throws java.lang.Throwable

Overrides:

eval in class Expression

Throws:

java.lang.Throwable

apply

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

Description copied from class: Procedure

Call this Procedure using the explicit-CallContext-convention. The input arguments are (by default) in stack.args; the result is written to ctx.consumer.

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

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

getType

public Type getType()

Description copied from class: Expression

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

Overrides:

getType in class Expression