Method fromSymbol

lib/script/opcode.js:551–574

* Instantiate a pushdata opcode from symbolic name. * @example * Opcode.fromSymbol('checksequenceverify') * @param {String} name * @returns {Opcode}

(name)

   */

  static fromSymbol(name) {
    assert(typeof name === 'string');
    assert(name.length > 0);

    if (name.charCodeAt(0) & 32)
      name = name.toUpperCase();

    if (!/^OP_/.test(name))
      name = `OP_${name}`;

    const op = common.opcodes[name];

    if (op != null)
      return this.fromOp(op);

    assert(/^OP_0X/.test(name), 'Unknown opcode.');
    assert(name.length === 7, 'Unknown opcode.');

    const value = parseInt(name.substring(5), 16);

    assert((value & 0xff) === value, 'Unknown opcode.');

    return this.fromOp(value);
  }

  /**
   * Instantiate opcode from buffer reader.