Function i18nUpdateOpCodesToString

packages/core/src/render3/i18n/i18n_debug.ts:73–124

(
  this: I18nUpdateOpCodes | void,
  opcodes?: I18nUpdateOpCodes,
)

 * @param opcodes `I18nUpdateOpCodes` if invoked as a function.
 */
export function i18nUpdateOpCodesToString(
  this: I18nUpdateOpCodes | void,
  opcodes?: I18nUpdateOpCodes,
): string[] {
  const parser = new OpCodeParser(opcodes || (Array.isArray(this) ? this : []));
  let lines: string[] = [];

  function consumeOpCode(value: number): string {
    const ref = value >>> I18nUpdateOpCode.SHIFT_REF;
    const opCode = value & I18nUpdateOpCode.MASK_OPCODE;
    switch (opCode) {
      case I18nUpdateOpCode.Text:
        return `(lView[${ref}] as Text).textContent = $$$`;
      case I18nUpdateOpCode.Attr:
        const attrName = parser.consumeString();
        const sanitizationFn = parser.consumeFunction();
        const value = sanitizationFn ? `(${sanitizationFn})($$$)` : '$$$';
        return `(lView[${ref}] as Element).setAttribute('${attrName}', ${value})`;
      case I18nUpdateOpCode.IcuSwitch:
        return `icuSwitchCase(${ref}, $$$)`;
      case I18nUpdateOpCode.IcuUpdate:
        return `icuUpdateCase(${ref})`;
    }
    throw new Error('unexpected OpCode');
  }

  while (parser.hasMore()) {
    let mask = parser.consumeNumber();
    let size = parser.consumeNumber();
    const end = parser.i + size;
    const statements: string[] = [];
    let statement = '';
    while (parser.i < end) {
      let value = parser.consumeNumberOrString();
      if (typeof value === 'string') {
        statement += value;
      } else if (value < 0) {
        // Negative numbers are ref indexes
        // Here `i` refers to current binding index. It is to signify that the value is relative,
        // rather than absolute.
        statement += '${lView[i' + value + ']}';
      } else {
        // Positive numbers are operations.
        const opCodeText = consumeOpCode(value);
        statements.push(opCodeText.replace('$$$', '`' + statement + '`') + ';');
        statement = '';
      }
    }
    lines.push(`if (mask & 0b${mask.toString(2)}) { ${statements.join(' ')} }`);
  }
  return lines;
}

/**
 * Converts `I18nCreateOpCodes` array into a human readable format.