Class Parser

classpath/java/util/Properties.java:65–184

  }

  private abstract static class Parser {
    private StringBuilder key = null;
    private StringBuilder value = null;
    private StringBuilder current = null;

    private void append(int c) {
      if (current == null) {
        if (key == null) {
          current = key = new StringBuilder();
        } else {
          current = value = new StringBuilder();
        }
      }

      current.append((char) c);
    }

    private void finishLine(Map<String, Object> map) {
      if (key != null) {
        map.put(key.toString(),
                (value == null ? "" : value.toString().trim()));
      }

      key = value = current = null;
    }

    abstract int readCharacter() throws IOException;

    char readUtf16() throws IOException {
      char c = 0;
      for (int i = 0; i < 4; ++i) {
        int digit = Character.digit((char)readCharacter(), 16);
        if (digit == -1) throw new IOException("Invalid Unicode escape encountered.");
        c <<= 4;
        c |= digit;
      }   
      return c;
    }

    void parse(Map map)
      throws IOException
    {
      boolean escaped = false;

      int c;
      while ((c = readCharacter()) != -1) {
        if (c == '\\') {
          if (escaped) {
            escaped = false;
            append(c);
          } else {
            escaped = true;
          }
        } else {
          switch (c) {
          case '#':
          case '!':
            if (key == null) {