/*
* Copyright 2014 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.gwt.resources.gss;
import com.google.gwt.thirdparty.common.css.compiler.ast.CssCompilerPass;
import com.google.gwt.thirdparty.common.css.compiler.ast.CssConditionalRuleNode;
import com.google.gwt.thirdparty.common.css.compiler.ast.CssDefinitionNode;
import com.google.gwt.thirdparty.common.css.compiler.ast.CssUnknownAtRuleNode;
import com.google.gwt.thirdparty.common.css.compiler.ast.DefaultTreeVisitor;
import com.google.gwt.thirdparty.common.css.compiler.ast.ErrorManager;
import com.google.gwt.thirdparty.common.css.compiler.ast.GssError;
import com.google.gwt.thirdparty.common.css.compiler.ast.VisitController;
/**
* Visitor that validates runtime conditional node.
* <p/>
* Runtime conditional node shouldn't contain any constant definitions nor external at-rule.
*/
public class ValidateRuntimeConditionalNode extends DefaultTreeVisitor implements
CssCompilerPass {
private final VisitController visitController;
private final ErrorManager errorManager;
private final boolean lenient;
private int cssConditionalRuleNodes;
public ValidateRuntimeConditionalNode(VisitController visitController,
ErrorManager errorManager, boolean lenient) {
this.visitController = visitController;
this.errorManager = errorManager;
this.lenient = lenient;
}
@Override
public boolean enterDefinition(CssDefinitionNode node) {
if (inConditionalRule()) {
if (lenient) {
errorManager.reportWarning(new GssError("You should not define a constant inside a " +
"ConditionalNode that will be evaluated at runtime. This will be disallowed in " +
"the next version of GWT.", node.getSourceCodeLocation()));
} else {
errorManager.report(new GssError("You cannot define a constant inside a ConditionalNode " +
"that will be evaluated at runtime.", node.getSourceCodeLocation()));
}
}
return false;
}
@Override
public boolean enterUnknownAtRule(CssUnknownAtRuleNode node) {
if (inConditionalRule() && "external".equals(node.getName().getValue())) {
if (lenient) {
errorManager.reportWarning(new GssError("You should not define a external at-rule inside" +
" a ConditionalNode that will be evaluated at runtime. This will be disallowed in " +
"the next version of GWT.", node.getSourceCodeLocation()));
} else {
errorManager.report(new GssError("You cannot define a external at-rule inside a " +
"ConditionalNode that will be evaluated at runtime.", node.getSourceCodeLocation()));
}
}
return super.enterUnknownAtRule(node);
}
@Override
public boolean enterConditionalRule(CssConditionalRuleNode node) {
cssConditionalRuleNodes++;
return true;
}
@Override
public void leaveConditionalRule(CssConditionalRuleNode node) {
cssConditionalRuleNodes--;
}
@Override
public void runPass() {
cssConditionalRuleNodes = 0;
visitController.startVisit(this);
}
private boolean inConditionalRule() {
return cssConditionalRuleNodes > 0;
}
}