Method doPeek

gson/src/main/java/com/google/gson/stream/JsonReader.java:581–730

()

  }

  @SuppressWarnings("fallthrough")
  int doPeek() throws IOException {
    int peekStack = stack[stackSize - 1];
    if (peekStack == JsonScope.EMPTY_ARRAY) {
      stack[stackSize - 1] = JsonScope.NONEMPTY_ARRAY;
    } else if (peekStack == JsonScope.NONEMPTY_ARRAY) {
      // Look for a comma before the next element.
      int c = nextNonWhitespace(true);
      switch (c) {
        case ']':
          peeked = PEEKED_END_ARRAY;
          return peeked;
        case ';':
          checkLenient(); // fall-through
        case ',':
          break;
        default:
          throw syntaxError("Unterminated array");
      }
    } else if (peekStack == JsonScope.EMPTY_OBJECT || peekStack == JsonScope.NONEMPTY_OBJECT) {
      stack[stackSize - 1] = JsonScope.DANGLING_NAME;
      // Look for a comma before the next element.
      if (peekStack == JsonScope.NONEMPTY_OBJECT) {
        int c = nextNonWhitespace(true);
        switch (c) {
          case '}':
            peeked = PEEKED_END_OBJECT;
            return peeked;
          case ';':
            checkLenient(); // fall-through
          case ',':
            break;
          default:
            throw syntaxError("Unterminated object");
        }
      }
      int c = nextNonWhitespace(true);
      switch (c) {
        case '"':
          peeked = PEEKED_DOUBLE_QUOTED_NAME;
          return peeked;
        case '\'':
          checkLenient();
          peeked = PEEKED_SINGLE_QUOTED_NAME;
          return peeked;
        case '}':
          if (peekStack != JsonScope.NONEMPTY_OBJECT) {
            peeked = PEEKED_END_OBJECT;
            return peeked;
          } else {
            throw syntaxError("Expected name");
          }
        default:
          checkLenient();
          pos--; // Don't consume the first character in an unquoted string.
          if (isLiteral((char) c)) {
            peeked = PEEKED_UNQUOTED_NAME;
            return peeked;