Remove backends.

compiler/java/com/google/dart/compiler/backend/js/JsParserException.java

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-package com.google.dart.compiler.backend.js;
-
-/**
- * Indicates inability to parse JavaScript source.
- */
-public class JsParserException extends Exception {
-
-  /**
-   * Represents the location of a parser exception.
-   */
-  public static class SourceDetail {
-    private final String fileName;
-    private final int line;
-    private final int lineOffset;
-    private final String lineSource;
-
-    public SourceDetail(int line, String lineSource, int lineOffset, String fileName) {
-      this.line = line;
-      this.lineSource = lineSource;
-      this.lineOffset = lineOffset;
-      this.fileName = fileName;
-    }
-
-    public String getFileName() {
-      return fileName;
-    }
-
-    public int getLine() {
-      return line;
-    }
-
-    public int getLineOffset() {
-      return lineOffset;
-    }
-
-    public String getLineSource() {
-      return lineSource;
-    }
-  }
-
-  private static String createMessageWithDetail(String msg, SourceDetail sourceDetail) {
-    if (sourceDetail == null) {
-      return msg;
-    }
-    StringBuffer sb = new StringBuffer();
-    sb.append(sourceDetail.getFileName());
-    sb.append('(');
-    sb.append(sourceDetail.getLine());
-    sb.append(')');
-    sb.append(": ");
-    sb.append(msg);
-    if (sourceDetail.getLineSource() != null) {
-      sb.append("\n> ");
-      sb.append(sourceDetail.getLineSource());
-      sb.append("\n> ");
-      for (int i = 0, n = sourceDetail.getLineOffset(); i < n; ++i) {
-        sb.append('-');
-      }
-      sb.append('^');
-    }
-    return sb.toString();
-  }
-
-  private final SourceDetail sourceDetail;
-
-  public JsParserException(String msg) {
-    this(msg, null);
-  }
-
-  public JsParserException(String msg, int line, String lineSource, int lineOffset, String fileName) {
-    this(msg, new SourceDetail(line, lineSource, lineOffset, fileName));
-  }
-
-  public JsParserException(String msg, SourceDetail sourceDetail) {
-    super(createMessageWithDetail(msg, sourceDetail));
-    this.sourceDetail = sourceDetail;
-  }
-
-  /**
-   * Provides additional source detail in some cases.
-   * 
-   * @return additional detail regarding the error, or <code>null</code> if no
-   *         additional detail is available
-   */
-  public SourceDetail getSourceDetail() {
-    return sourceDetail;
-  }
-}