Method fromString

lib/script/script.js:3015–3069

* Inject properties from bitcoind test string. * @private * @param {String} items - Script string. * @throws Parse error.

(code)

   */

  fromString(code) {
    assert(typeof code === 'string');

    code = code.trim();

    if (code.length === 0)
      return this;

    const items = code.split(/\s+/);
    const bw = bio.write();

    for (const item of items) {
      let symbol = item;

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

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

      const value = opcodes[symbol];

      if (value == null) {
        if (item[0] === '\'') {
          assert(item[item.length - 1] === '\'', 'Invalid string.');
          const str = item.slice(1, -1);
          const op = Opcode.fromString(str);
          bw.writeBytes(op.toRaw());
          continue;
        }

        if (/^-?\d+$/.test(item)) {
          const num = ScriptNum.fromString(item, 10);
          const op = Opcode.fromNum(num);
          bw.writeBytes(op.toRaw());
          continue;
        }

        assert(item.indexOf('0x') === 0, 'Unknown opcode.');

        const hex = item.substring(2);
        const data = Buffer.from(hex, 'hex');

        assert(data.length === hex.length / 2, 'Invalid hex string.');

        bw.writeBytes(data);

        continue;
      }

      bw.writeU8(value);
    }

    return this.fromRaw(bw.render());
  }

  /**
   * Parse a bitcoind test script