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/*
* ForExpression.java
*
* Copyright (c) 2012 Mike Strobel
*
* This source code is based on the Dynamic Language Runtime from Microsoft,
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Apache License, Version 2.0.
* A copy of the license can be found in the License.html file at the root of this distribution.
* By using this source code in any fashion, you are agreeing to be bound by the terms of the
* Apache License, Version 2.0.
*
* You must not remove this notice, or any other, from this software.
*/
package com.strobel.expressions;
import com.strobel.reflection.PrimitiveTypes;
import com.strobel.reflection.Type;
public final class ForExpression extends Expression {
private final ParameterExpression _variable;
private final Expression _initializer;
private final Expression _test;
private final Expression _step;
private final Expression _body;
private final LabelTarget _breakTarget;
private final LabelTarget _continueTarget;
ForExpression(
final ParameterExpression variable,
final Expression initializer,
final Expression test,
final Expression step,
final Expression body,
final LabelTarget breakTarget,
final LabelTarget continueTarget) {
_variable = variable;
_initializer = initializer;
_test = test;
_step = step;
_body = body;
_breakTarget = breakTarget;
_continueTarget = continueTarget;
}
public ParameterExpression getVariable() {
return _variable;
}
public Expression getInitializer() {
return _initializer;
}
public Expression getTest() {
return _test;
}
public Expression getStep() {
return _step;
}
public Expression getBody() {
return _body;
}
public LabelTarget getBreakTarget() {
return _breakTarget;
}
public LabelTarget getContinueTarget() {
return _continueTarget;
}
@Override
public ExpressionType getNodeType() {
return ExpressionType.Extension;
}
@Override
public Type getType() {
if (_breakTarget != null) {
return _breakTarget.getType();
}
return PrimitiveTypes.Void;
}
@Override
public boolean canReduce() {
return true;
}
public ForExpression update(
final ParameterExpression variable,
final Expression initializer,
final Expression test,
final Expression step,
final Expression body,
final LabelTarget breakTarget,
final LabelTarget continueTarget) {
if (variable == _variable &&
initializer == _initializer &&
body == _body &&
test == _test &&
step == _step &&
breakTarget == _breakTarget &&
continueTarget == _continueTarget) {
return this;
}
return makeFor(
variable,
initializer,
test,
step,
body,
breakTarget,
continueTarget
);
}
@Override
protected Expression accept(final ExpressionVisitor visitor) {
return visitor.visitFor(this);
}
@Override
protected Expression visitChildren(final ExpressionVisitor visitor) {
return update(
(ParameterExpression)visitor.visit(_variable),
visitor.visit(_initializer),
visitor.visit(_test),
visitor.visit(_step),
visitor.visit(_body),
visitor.visitLabelTarget(_breakTarget),
visitor.visitLabelTarget(_continueTarget)
);
}
@Override
public Expression reduce() {
final LabelTarget breakTarget = _breakTarget != null ? _breakTarget : label();
final LabelTarget continueTarget = _continueTarget != null ? _continueTarget : label();
return block(
new ParameterExpressionList(_variable),
assign(_variable, _initializer),
loop(
block(
ifThen(not(_test), makeBreak(breakTarget)),
_body,
label(continueTarget),
_step
)
),
label(breakTarget)
);
}
}
