| /* |
| * Copyright 2013 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.dev.codeserver; |
| |
| import com.google.gwt.core.ext.TreeLogger; |
| import com.google.gwt.dev.util.Util; |
| import com.google.gwt.thirdparty.debugging.sourcemap.SourceMapConsumerV3; |
| import com.google.gwt.thirdparty.debugging.sourcemap.SourceMapParseException; |
| |
| import java.io.File; |
| |
| /** |
| * A mapping from Java lines to JavaScript. |
| */ |
| class ReverseSourceMap { |
| private final SourceMapConsumerV3 consumer; |
| |
| private ReverseSourceMap(SourceMapConsumerV3 consumer) { |
| this.consumer = consumer; |
| } |
| |
| /** |
| * Reads a source map from disk and parses it into an in-memory representation. |
| * If it can't be loaded, logs a warning and returns an empty source map. |
| */ |
| static ReverseSourceMap load(TreeLogger logger, File sourceMapFile) { |
| SourceMapConsumerV3 consumer = new SourceMapConsumerV3(); |
| String unparsed = Util.readFileAsString(sourceMapFile); |
| try { |
| consumer.parse(unparsed); |
| return new ReverseSourceMap(consumer); |
| } catch (SourceMapParseException e) { |
| logger.log(TreeLogger.WARN, "can't parse source map", e); |
| return new ReverseSourceMap(null); |
| } |
| } |
| |
| /** |
| * Returns true if the given line in a Java file has any corresponding JavaScript in |
| * the GWT compiler's output. (The source file's path is relative to the source root directory |
| * where the GWT compiler found it.) |
| */ |
| boolean appearsInJavaScript(String path, int lineNumber) { |
| // TODO: getReverseMapping() seems to be off by one (lines numbered from zero). Why? |
| return consumer != null && !consumer.getReverseMapping(path, lineNumber - 1, -1).isEmpty(); |
| } |
| } |