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/*
 * 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.
 * 

* 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; } }





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