/*
* Copyright 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.css.compiler.ast;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import javax.annotation.Nullable;
/**
* A node representing a conditional rule such as @if or @else.
*
*/
public class CssConditionalRuleNode extends CssAtRuleNode {
/**
* Constructor of a conditional rule.
*
* @param type Type of the rule
* @param name Name of the rule
*/
public CssConditionalRuleNode(Type type, CssLiteralNode name) {
super(type, name);
Preconditions.checkArgument(this.getType().isConditional());
}
/**
* Constructor of a conditional rule.
*
* @param type Type of the rule
* @param name Name of the rule
* @param condition The condition of the rule
* @param block A block
*/
public CssConditionalRuleNode(Type type, CssLiteralNode name,
@Nullable CssBooleanExpressionNode condition,
CssAbstractBlockNode block) {
super(type, name, block);
Preconditions.checkArgument(this.getType().isConditional());
if (condition != null) {
setCondition(condition);
}
}
/**
* Copy constructor.
*
* @param node
*/
public CssConditionalRuleNode(CssConditionalRuleNode node) {
super(node);
if (node.getCondition() != null) {
this.setCondition(node.getCondition().deepCopy());
}
}
@Override
public CssConditionalRuleNode deepCopy() {
return new CssConditionalRuleNode(this);
}
@Override
void setParent(CssNode parent) {
Preconditions.checkArgument(parent instanceof CssConditionalBlockNode);
super.setParent(parent);
}
/**
* Can only be called after the node is completely built (meaning it has
* the condition set).
*/
public CssBooleanExpressionNode getCondition() {
if (getType() == Type.ELSE) {
Preconditions.checkState(getParametersCount() == 0);
return null;
}
Preconditions.checkState(getParametersCount() == 1);
return (CssBooleanExpressionNode) this.getParameters().get(0);
}
void setCondition(CssBooleanExpressionNode condition) {
Preconditions.checkState(getType() != Type.ELSE);
Preconditions.checkState(getParametersCount() <= 1);
this.setParameters(ImmutableList.<CssValueNode>of(condition));
}
@Override
public CssAbstractBlockNode getBlock() {
return super.getBlock();
}
// TODO(user): Make sure that the parameters list is made up of a single
// CssBooleanExpressionNode.
}