sdk/lib/_internal/js_runtime/lib/shared/recipe_syntax.dart

// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// Constants and predicates used for encoding and decoding type recipes.
///
/// This library is shared between the compiler and the runtime system.
library dart2js._recipe_syntax;

abstract class Recipe {
  Recipe._();

  // Operators.

  static const int noOp = _comma;

  static const int toType = _semicolon;

  static const int pushDynamic = _at;
  static const int pushVoid = _tilde;
  static const int wrapFutureOr = _formfeed;

  static const int startTypeArguments = _lessThan;
  static const int endTypeArguments = _greaterThan;

  static const int extensionOp = _ampersand;

  // Number and name components.

  static bool isDigit(int code) => code >= _digit0 && code <= _digit9;
  static int digitValue(int code) => code - _digit0;

  static bool isIdentifierStart(int ch) =>
      (((ch | 32) - _lowercaseA) & 0xffff) < 26 ||
      (ch == _underscore) ||
      (ch == _dollar);

  static const int period = _period;

  // Private names.

  static const int _formfeed = 0x0C; // '\f' in string literal.

  static const int _dollar = 0x24;
  static const int _ampersand = 0x26;
  static const int _plus = 0x2B;
  static const int _comma = 0x2C;
  static const int _period = 0x2E;
  static const int _digit0 = 0x30;
  static const int _digit9 = 0x39;
  static const int _semicolon = 0x3B;
  static const int _lessThan = 0x3C;
  static const int _greaterThan = 0x3E;
  static const int _question = 0x3f;
  static const int _at = 0x40;

  static const int _underscore = 0x5F;
  static const int _lowercaseA = 0x61;
  static const int _tilde = 0x7E;

  static const int _leftParen = 0x28;
  static const int _rightParen = 0x29;
  static const int _leftBracket = 0x5B;
  static const int _rightBracket = 0x5D;
  static const int _leftBrace = 0x7B;
  static const int _rightBrace = 0x7D;
}