Method nextLong

gson/src/main/java/com/google/gson/stream/JsonReader.java:1072–1116

Returns the {@link JsonToken#NUMBER long} value of the next token, consuming it. If the next token is a string, this method will attempt to parse it as a long. If the next token's numeric value cannot be exactly represented by a Java {@code long}, this method throws. @throws IllegalStateException i

()

   *     exactly represented as a long.
   */
  public long nextLong() throws IOException {
    int p = peeked;
    if (p == PEEKED_NONE) {
      p = doPeek();
    }

    if (p == PEEKED_LONG) {
      peeked = PEEKED_NONE;
      pathIndices[stackSize - 1]++;
      return peekedLong;
    }

    if (p == PEEKED_NUMBER) {
      peekedString = new String(buffer, pos, peekedNumberLength);
      pos += peekedNumberLength;
    } else if (p == PEEKED_SINGLE_QUOTED || p == PEEKED_DOUBLE_QUOTED || p == PEEKED_UNQUOTED) {
      if (p == PEEKED_UNQUOTED) {
        peekedString = nextUnquotedValue();
      } else {
        peekedString = nextQuotedValue(p == PEEKED_SINGLE_QUOTED ? '\'' : '"');
      }
      validateAscii(peekedString);
      try {
        long result = Long.parseLong(peekedString);
        peeked = PEEKED_NONE;
        pathIndices[stackSize - 1]++;
        return result;
      } catch (NumberFormatException ignored) {
        // Fall back to parse as a double below.
      }
    } else {
      throw unexpectedTokenError("a long");
    }

    peeked = PEEKED_BUFFERED;
    double asDouble = Double.parseDouble(peekedString); // don't catch this NumberFormatException.
    long result = (long) asDouble;
    if (result != asDouble) { // Make sure no precision was lost casting to 'long'.
      throw new NumberFormatException("Expected a long but was " + peekedString + locationString());
    }
    peekedString = null;
    peeked = PEEKED_NONE;
    pathIndices[stackSize - 1]++;
    return result;
  }

  /**
   * Returns the string up to but not including {@code quote}, unescaping any character escape