/**
   * Reads the file that specifies method calls that should be replaced by other method calls. The
   * file is of the form:
   *
   * <p>[regex] [orig-method-def] [new-method-name]
   *
   * <p>where the orig_method-def is of the form:
   *
   * <p>fully-qualified-method-name (args)
   *
   * <p>Blank lines and // comments are ignored. The orig-method-def is replaced by a call to
   * new-method-name with the same arguments in any classfile that matches the regular expressions.
   * All method names and argument types should be fully qualified.
   */
  public void read_map_file(File map_file) throws IOException {

    LineNumberReader lr = new LineNumberReader(new FileReader(map_file));
    MapFileError mfe = new MapFileError(lr, map_file);
    Pattern current_regex = null;
    Map<MethodDef, MethodInfo> map = new LinkedHashMap<MethodDef, MethodInfo>();
    for (String line = lr.readLine(); line != null; line = lr.readLine()) {
      line = line.replaceFirst("//.*$", "");
      if (line.trim().length() == 0) continue;
      if (line.startsWith(" ")) {
        if (current_regex == null)
          throw new IOException("No current class regex on line " + lr.getLineNumber());
        StrTok st = new StrTok(line, mfe);
        st.stok.wordChars('.', '.');
        MethodDef md = parse_method(st);
        String new_method = st.need_word();
        map.put(md, new MethodInfo(new_method));
      } else {
        if (current_regex != null) {
          MethodMapInfo mmi = new MethodMapInfo(current_regex, map);
          map_list.add(mmi);
          map = new LinkedHashMap<MethodDef, MethodInfo>();
        }
        current_regex = Pattern.compile(line);
      }
    }
    if (current_regex != null) {
      MethodMapInfo mmi = new MethodMapInfo(current_regex, map);
      map_list.add(mmi);
    }

    dump_map_list();
  }
 public void tok_error(String s) {
   throw new RuntimeException(
       String.format("Error on line %d of %s: %s", lr.getLineNumber(), map_file, s));
 }