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/*
 * Copyright 2009 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.css.SourceCodeLocation;

import java.util.regex.Pattern;

import javax.annotation.Nullable;

/**
 * A node holding a reference to a constant or an argument of a mixin
 * definition.
 *
 * 

Because references can be valid within one block, each reference has a * scope where it is valid. For example, references to arguments of mixin * definitions are only valid in the block of the mixin definition whereas * references to global definitions are valid everywhere. * * @author [email protected] (Oana Florescu) * @author [email protected] (Florian Benz) */ public class CssConstantReferenceNode extends CssValueNode { private static final Pattern PATTERN = Pattern.compile("[A-Z_][A-Z0-9_]*"); /** * The scope is initialized lazily because it can be impossible to determine * the scope during construction as the node might have no parent at that * time. */ private CssNode scope; public CssConstantReferenceNode(String value, @Nullable SourceCodeLocation sourceCodeLocation) { super(value, sourceCodeLocation); } public CssConstantReferenceNode(String value) { this(value, null); } /** * Creates a new constant reference node that is a deep copy of the * given node. */ public CssConstantReferenceNode(CssConstantReferenceNode node) { super(node); this.scope = node.scope; } @Override public CssConstantReferenceNode deepCopy() { return new CssConstantReferenceNode(this); } /** * Returns the scope of the reference. If the reference belongs to a global * definition, the scope is the 'global scope'. If the reference belongs to * an argument of a mixin definition, the scope is the mixin definition. */ public CssNode getScope() { return scope; } public void setScope(CssNode scope) { this.scope = scope; } /** * Returns if the given identifier matches the pattern of a constant. */ public static boolean isDefinitionReference(String ident) { return PATTERN.matcher(ident).matches(); } }





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