| /* |
| * 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.resources.gss.ast.CssDotPathNode; |
| import com.google.gwt.thirdparty.common.css.compiler.ast.CssValueNode; |
| import com.google.gwt.thirdparty.common.css.compiler.ast.ErrorManager; |
| import com.google.gwt.thirdparty.common.css.compiler.ast.GssFunction; |
| import com.google.gwt.thirdparty.common.css.compiler.ast.GssFunctionException; |
| import com.google.gwt.thirdparty.guava.common.collect.ImmutableList; |
| |
| import java.util.List; |
| |
| /** |
| * Handles the value() function. This function takes a sequence of dot-separated identifiers |
| * interpreted as zero-arg method invocations. It can takes a optional prefix and suffix. |
| */ |
| public class ValueFunction implements GssFunction { |
| public static String getName() { |
| return "value"; |
| } |
| |
| @Override |
| public List<CssValueNode> getCallResultNodes(List<CssValueNode> args, ErrorManager errorManager) |
| throws GssFunctionException { |
| if (args.size() == 0 || args.size() > 3) { |
| throw new GssFunctionException(getName() + " function takes one, two or three arguments"); |
| } |
| |
| String functionPath = args.get(0).getValue(); |
| String prefix = null; |
| String suffix = null; |
| |
| if (args.size() > 1) { |
| suffix = args.get(1).getValue(); |
| } |
| |
| if (args.size() > 2) { |
| prefix = args.get(2).getValue(); |
| } |
| |
| CssDotPathNode cssDotPathNode = new CssDotPathNode(functionPath, prefix, suffix, |
| args.get(0).getSourceCodeLocation()); |
| |
| return ImmutableList.of((CssValueNode) cssDotPathNode); |
| } |
| |
| @Override |
| public String getCallResultString(List<String> args) throws GssFunctionException { |
| |
| String functionPath = args.get(0); |
| String prefix = null; |
| String suffix = null; |
| |
| if (args.size() > 1) { |
| suffix = args.get(1); |
| } |
| |
| if (args.size() > 2) { |
| prefix = args.get(2); |
| } |
| |
| return CssDotPathNode.resolveExpression(null, functionPath, prefix, suffix); |
| } |
| |
| @Override |
| public Integer getNumExpectedArguments() { |
| // number of arguments is variable |
| return null; |
| } |
| } |
| |