gnu.expr
Class SetExp

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

All Implemented Interfaces:

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

public class SetExp
extends AccessExp

An Expression to set (bind) or define a new value to a named variable.

Field Summary

static int	DEFINING_FLAG
static int	GLOBAL_FLAG
static int	HAS_VALUE
static int	PREFER_BINDING2
static int	PROCEDURE
static int	SET_IF_UNBOUND

Fields inherited from class gnu.expr.Expression

flags, NEXT_AVAIL_FLAG, noExpressions

Constructor Summary

SetExp(Declaration decl, Expression val)

SetExp(java.lang.Object symbol, Expression val)

Method Summary

void	apply(CallContext ctx) Evaluate the expression.
void	compile(Compilation comp, Target target)
boolean	getHasValue() True if evaluating the SetExp yields the value of the RHS.
Expression	getNewValue() Get the Expression for calculating the new ("right-hand") value.
Type	getType() Return the Type used to represent the values of this Expression.
boolean	isDefining()
boolean	isFuncDef() True if this is a functon definition ("defun").
boolean	isSetIfUnbound()
static SetExp	makeDefinition(Declaration decl, Expression val)
static SetExp	makeDefinition(java.lang.Object symbol, Expression val)
protected boolean	mustCompile()
void	print(OutPort out)
void	setDefining(boolean value)
void	setFuncDef(boolean value)
void	setHasValue(boolean value)
void	setSetIfUnbound(boolean value)
java.lang.String	toString()
protected Expression	walk(ExpWalker walker)
protected void	walkChildren(ExpWalker walker)

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, 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

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

DEFINING_FLAG

public static final int DEFINING_FLAG

See Also:

Constant Field Values

GLOBAL_FLAG

public static final int GLOBAL_FLAG

See Also:

Constant Field Values

PREFER_BINDING2

public static final int PREFER_BINDING2

See Also:

Constant Field Values

PROCEDURE

public static final int PROCEDURE

See Also:

Constant Field Values

SET_IF_UNBOUND

public static final int SET_IF_UNBOUND

See Also:

Constant Field Values

HAS_VALUE

public static final int HAS_VALUE

See Also:

Constant Field Values

Constructor Detail

SetExp

public SetExp(java.lang.Object symbol,
              Expression val)

SetExp

public SetExp(Declaration decl,
              Expression val)

Method Detail

makeDefinition

public static SetExp makeDefinition(java.lang.Object symbol,
                                    Expression val)

makeDefinition

public static SetExp makeDefinition(Declaration decl,
                                    Expression val)

getNewValue

public final Expression getNewValue()

Get the Expression for calculating the new ("right-hand") value.

isDefining

public final boolean isDefining()

setDefining

public final void setDefining(boolean value)

getHasValue

public final boolean getHasValue()

True if evaluating the SetExp yields the value of the RHS.

setHasValue

public final void setHasValue(boolean value)

isFuncDef

public final boolean isFuncDef()

True if this is a functon definition ("defun").

setFuncDef

public final void setFuncDef(boolean value)

isSetIfUnbound

public final boolean isSetIfUnbound()

setSetIfUnbound

public final void setSetIfUnbound(boolean value)

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 Expression

walkChildren

protected void walkChildren(ExpWalker walker)

Overrides:

walkChildren in class Expression

print

public void print(OutPort out)

Specified by:

print in class Expression

toString

public java.lang.String toString()

Overrides:

toString in class Expression