pkg/front_end/lib/src/fasta/operator.dart

// Copyright (c) 2017, 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.

library fasta.operators;

/// The user-definable operators in Dart.
///
/// The names have been chosen to represent their normal semantic meaning.
enum Operator {
  add,
  bitwiseAnd,
  bitwiseNot,
  bitwiseOr,
  bitwiseXor,
  divide,
  equals,
  greaterThan,
  greaterThanEquals,
  indexGet,
  indexSet,
  leftShift,
  lessThan,
  lessThanEquals,
  modulo,
  multiply,
  rightShift,
  subtract,
  truncatingDivide,
  unaryMinus,
}

Operator operatorFromString(String string) {
  if (identical("+", string)) return Operator.add;
  if (identical("&", string)) return Operator.bitwiseAnd;
  if (identical("~", string)) return Operator.bitwiseNot;
  if (identical("|", string)) return Operator.bitwiseOr;
  if (identical("^", string)) return Operator.bitwiseXor;
  if (identical("/", string)) return Operator.divide;
  if (identical("==", string)) return Operator.equals;
  if (identical(">", string)) return Operator.greaterThan;
  if (identical(">=", string)) return Operator.greaterThanEquals;
  if (identical("[]", string)) return Operator.indexGet;
  if (identical("[]=", string)) return Operator.indexSet;
  if (identical("<<", string)) return Operator.leftShift;
  if (identical("<", string)) return Operator.lessThan;
  if (identical("<=", string)) return Operator.lessThanEquals;
  if (identical("%", string)) return Operator.modulo;
  if (identical("*", string)) return Operator.multiply;
  if (identical(">>", string)) return Operator.rightShift;
  if (identical("-", string)) return Operator.subtract;
  if (identical("~/", string)) return Operator.truncatingDivide;
  if (identical("unary-", string)) return Operator.unaryMinus;
  return null;
}

String operatorToString(Operator operator) {
  switch (operator) {
    case Operator.add: return "+";
    case Operator.bitwiseAnd: return "&";
    case Operator.bitwiseNot: return "~";
    case Operator.bitwiseOr: return "|";
    case Operator.bitwiseXor: return "^";
    case Operator.divide: return "/";
    case Operator.equals: return "==";
    case Operator.greaterThan: return ">";
    case Operator.greaterThanEquals: return ">=";
    case Operator.indexGet: return "[]";
    case Operator.indexSet: return "[]=";
    case Operator.leftShift: return "<<";
    case Operator.lessThan: return "<";
    case Operator.lessThanEquals: return "<=";
    case Operator.modulo: return "%";
    case Operator.multiply: return "*";
    case Operator.rightShift: return ">>";
    case Operator.subtract: return "-";
    case Operator.truncatingDivide: return "~/";
    case Operator.unaryMinus: return "unary-";
  }
}