| /* |
| * 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; |
| } |
| } |