/*
* 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.passes;
import com.google.common.collect.Lists;
import com.google.common.css.compiler.ast.CssAtRuleNode;
import com.google.common.css.compiler.ast.CssCompilerPass;
import com.google.common.css.compiler.ast.CssConstantReferenceNode;
import com.google.common.css.compiler.ast.CssDefinitionNode;
import com.google.common.css.compiler.ast.CssLiteralNode;
import com.google.common.css.compiler.ast.CssNode;
import com.google.common.css.compiler.ast.CssUnknownAtRuleNode;
import com.google.common.css.compiler.ast.CssValueNode;
import com.google.common.css.compiler.ast.DefaultTreeVisitor;
import com.google.common.css.compiler.ast.ErrorManager;
import com.google.common.css.compiler.ast.GssError;
import com.google.common.css.compiler.ast.MutatingVisitController;
import java.util.List;
/**
* A compiler pass that transforms each well-formed {@code @def}
* {@link CssUnknownAtRuleNode} to a {@link CssDefinitionNode}.
*
*/
public class CreateDefinitionNodes extends DefaultTreeVisitor
implements CssCompilerPass {
private static final String defName =
CssAtRuleNode.Type.DEF.getCanonicalName();
private final MutatingVisitController visitController;
private final ErrorManager errorManager;
public CreateDefinitionNodes(
MutatingVisitController visitController, ErrorManager errorManager) {
this.visitController = visitController;
this.errorManager = errorManager;
}
@Override
public boolean enterUnknownAtRule(CssUnknownAtRuleNode node) {
if (node.getName().getValue().equals(defName)) {
if (node.getType().hasBlock()) {
reportError("@" + defName + " with block", node);
return false;
}
List<CssValueNode> params = node.getParameters();
if (params.isEmpty()) {
reportError("@" + defName + " without name", node);
return false;
}
CssNode nameNode = params.get(0);
if (!(nameNode instanceof CssLiteralNode)) {
reportError("@" + defName + " without a valid literal as name", node);
return false;
}
CssLiteralNode defNameNode = (CssLiteralNode) nameNode;
String defName = defNameNode.getValue();
if (!CssConstantReferenceNode.isDefinitionReference(defName)) {
errorManager.reportWarning(new GssError(
String.format(
"WARNING for invalid @def name %s. We will ignore this.",
defName),
defNameNode.getSourceCodeLocation()));
// Create a definition node anyway, so that the compiler doesn't crash.
}
CssDefinitionNode def = new CssDefinitionNode(
params.subList(1, params.size()),
(CssLiteralNode) nameNode,
node.getComments(),
node.getSourceCodeLocation());
visitController.replaceCurrentBlockChildWith(
Lists.newArrayList((CssNode) def), false);
return false;
}
return true;
}
private void reportError(String message, CssNode node) {
errorManager.report(new GssError(message, node.getSourceCodeLocation()));
visitController.removeCurrentNode();
}
@Override
public void runPass() {
visitController.startVisit(this);
}
}