| /* |
| * 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.gwt.resources.css; |
| |
| import com.google.gwt.core.ext.TreeLogger; |
| import com.google.gwt.core.ext.typeinfo.JClassType; |
| import com.google.gwt.core.ext.typeinfo.JType; |
| import com.google.gwt.core.ext.typeinfo.NotFoundException; |
| import com.google.gwt.resources.client.DataResource; |
| import com.google.gwt.resources.client.ImageResource; |
| import com.google.gwt.resources.css.ast.Context; |
| import com.google.gwt.resources.css.ast.CssCompilerException; |
| import com.google.gwt.resources.css.ast.CssDef; |
| import com.google.gwt.resources.css.ast.CssProperty; |
| import com.google.gwt.resources.css.ast.CssProperty.DotPathValue; |
| import com.google.gwt.resources.css.ast.CssProperty.ExpressionValue; |
| import com.google.gwt.resources.css.ast.CssProperty.FunctionValue; |
| import com.google.gwt.resources.css.ast.CssProperty.IdentValue; |
| import com.google.gwt.resources.css.ast.CssProperty.ListValue; |
| import com.google.gwt.resources.css.ast.CssProperty.Value; |
| import com.google.gwt.resources.css.ast.CssUrl; |
| import com.google.gwt.resources.css.ast.CssVisitor; |
| import com.google.gwt.resources.ext.ResourceContext; |
| import com.google.gwt.resources.ext.ResourceGeneratorUtil; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Substitute symbolic replacements into string values. |
| */ |
| public class SubstitutionReplacer extends CssVisitor { |
| private final ResourceContext context; |
| private final JClassType dataResourceType; |
| private final JClassType imageResourceType; |
| private final TreeLogger logger; |
| private final Map<String, CssDef> substitutions; |
| |
| public SubstitutionReplacer(TreeLogger logger, ResourceContext context, |
| Map<String, CssDef> substitutions) { |
| this.context = context; |
| this.dataResourceType = context.getGeneratorContext().getTypeOracle().findType( |
| DataResource.class.getCanonicalName()); |
| this.imageResourceType = context.getGeneratorContext().getTypeOracle().findType( |
| ImageResource.class.getCanonicalName()); |
| this.logger = logger; |
| this.substitutions = substitutions; |
| } |
| |
| @Override |
| public void endVisit(CssProperty x, Context ctx) { |
| if (x.getValues() == null) { |
| // Nothing to do |
| return; |
| } |
| x.setValue(substituteDefs(x.getValues())); |
| } |
| |
| private ListValue substituteDefs(ListValue listValue) { |
| List<Value> result = new ArrayList<Value>(listValue.getValues().size()); |
| for (Value val : listValue.getValues()) { |
| if (val.isFunctionValue() != null) { |
| // Recursively perform substitution on a function's values |
| FunctionValue fnVal = val.isFunctionValue(); |
| ListValue newVals = substituteDefs(fnVal.getValues()); |
| result.add(new FunctionValue(fnVal.getName(), newVals)); |
| continue; |
| } |
| |
| IdentValue maybeIdent = val.isIdentValue(); |
| if (maybeIdent == null) { |
| // Not an ident, append as-is to result |
| result.add(val); |
| continue; |
| } |
| |
| String identStr = maybeIdent.getIdent(); |
| CssDef def = substitutions.get(identStr); |
| |
| if (def == null) { |
| // No substitution found, append as-is to result |
| result.add(val); |
| continue; |
| } else if (def instanceof CssUrl) { |
| assert def.getValues().size() == 1; |
| assert def.getValues().get(0).isDotPathValue() != null; |
| DotPathValue functionName = def.getValues().get(0).isDotPathValue(); |
| |
| JType methodType = null; |
| try { |
| methodType = ResourceGeneratorUtil.getMethodByPath(context.getClientBundleType(), |
| functionName.getParts(), null).getReturnType(); |
| } catch (NotFoundException e) { |
| logger.log(TreeLogger.ERROR, e.getMessage()); |
| throw new CssCompilerException("Cannot find data method"); |
| } |
| |
| if (!(methodType instanceof JClassType) || |
| (!dataResourceType.isAssignableFrom((JClassType) methodType) && |
| !imageResourceType.isAssignableFrom((JClassType) methodType))) { |
| String message = "Invalid method type for url substitution: " + methodType + ". " + |
| "Only DataResource and ImageResource are supported."; |
| logger.log(TreeLogger.ERROR, message); |
| throw new CssCompilerException(message); |
| } |
| |
| StringBuilder expression = new StringBuilder(); |
| expression.append("\"url('\" + "); |
| expression.append(context.getImplementationSimpleSourceName()); |
| expression.append(".this."); |
| expression.append(functionName.getExpression()); |
| expression.append(".getSafeUri().asString()"); |
| expression.append(" + \"')\""); |
| result.add(new ExpressionValue(expression.toString())); |
| } else { |
| for (Value defValue : def.getValues()) { |
| result.add(defValue); |
| } |
| } |
| } |
| return new ListValue(result); |
| } |
| } |