tests/corelib/regexp/invalid-range-in-class_test.dart

// Copyright (c) 2014, the Dart project authors. All rights reserved.
// Copyright 2013 the V8 project authors. All rights reserved.
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import 'v8_regexp_utils.dart';
import 'package:expect/expect.dart';

void main() {
  description("This page tests invalid character ranges in character classes.");

  // These test a basic range / non range.
  shouldBe(new RegExp(r"[a-c]+").firstMatch("-acbd"), ["acb"]);
  shouldBe(new RegExp(r"[a\-c]+").firstMatch("-acbd"), ["-ac"]);

  // A reverse-range is invalid.
  assertThrows(() => new RegExp(r"[c-a]+").firstMatch("-acbd"));

  // A character-class in a range is invalid, according to ECMA-262, but we allow it.
  shouldBe(new RegExp(r"[\d-x]+").firstMatch("1-3xy"), ["1-3x"]);
  shouldBe(new RegExp(r"[x-\d]+").firstMatch("1-3xy"), ["1-3x"]);
  shouldBe(new RegExp(r"[\\d-\d]+").firstMatch("1-3xy"), ["1-3"]);

  // Whilst we break with ECMA-262's definition of CharacterRange, we do comply with
  // the grammar, and as such in the following regex a-z cannot be matched as a range.
  shouldBe(new RegExp(r"[\d-a-z]+").firstMatch("az1-3y"), ["az1-3"]);

  // An escaped hyphen should not be confused for an invalid range.
  shouldBe(new RegExp(r"[\d\-x]+").firstMatch("1-3xy"), ["1-3x"]);
  shouldBe(new RegExp(r"[x\-\d]+").firstMatch("1-3xy"), ["1-3x"]);
  shouldBe(new RegExp(r"[\d\-\d]+").firstMatch("1-3xy"), ["1-3"]);

  // A hyphen after a character-class is not invalid.
  shouldBe(new RegExp(r"[\d-]+").firstMatch("1-3xy"), ["1-3"]);
}