dart_style/lib/src/rule/combinator.dart - Issue 1400473008: Roll Observatory packages and add a roll script

Side by Side Diff: dart_style/lib/src/rule/combinator.dart

Issue 1400473008: Roll Observatory packages and add a roll script (Closed) Base URL: git@github.com:dart-lang/observatory_pub_packages.git@master

Patch Set: Created 5 years, 2 months ago

Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.

Jump to:

View unified diff | Download patch

OLD	NEW
	(Empty)
1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file

2 // for details. All rights reserved. Use of this source code is governed by a

3 // BSD-style license that can be found in the LICENSE file.

4

5 library dart_style.src.rule.combinator;

6

7 import '../chunk.dart';

8 import 'rule.dart';

9

10 /// Handles a list of "combinators".

11 ///

12 /// A combinator is a keyword followed by a list of nodes used to modify some

13 /// declaration. It's used for actual hide and show combinators as well as

14 /// "with" and "implements" clauses in class declarations.

15 ///

16 /// Combinators can be split in a few different ways:

17 ///

18 /// // All on one line:

19 /// import 'animals.dart' show Ant hide Cat;

20 ///

21 /// // Wrap before each keyword:

22 /// import 'animals.dart'

23 /// show Ant, Baboon

24 /// hide Cat;

25 ///

26 /// // Wrap either or both of the name lists:

27 /// import 'animals.dart'

28 /// show

29 /// Ant,

30 /// Baboon

31 /// hide Cat;

32 ///

33 /// These are not allowed:

34 ///

35 /// // Wrap list but not keyword:

36 /// import 'animals.dart' show

37 /// Ant,

38 /// Baboon

39 /// hide Cat;

40 ///

41 /// // Wrap one keyword but not both:

42 /// import 'animals.dart'

43 /// show Ant, Baboon hide Cat;

44 ///

45 /// This ensures that when any wrapping occurs, the keywords are always at

46 /// the beginning of the line.

47 class CombinatorRule extends Rule {

48 /// The set of chunks before the combinators.

49 final Set<Chunk> _combinators = new Set();

50

51 /// A list of sets of chunks prior to each name in a combinator.

52 ///

53 /// The outer list is a list of combinators (i.e. "hide", "show", etc.). Each

54 /// inner set is the set of names for that combinator.

55 final List<Set<Chunk>> _names = [];

56

57 int get numValues {

58 var count = 2; // No wrapping, or wrap just before each combinator.

59

60 if (_names.length == 2) {

61 count += 3; // Wrap first set of names, second, or both.

62 } else {

63 assert(_names.length == 1);

64 count++; // Wrap the names.

65 }

66

67 return count;

68 }

69

70 /// Adds a new combinator to the list of combinators.

71 ///

72 /// This must be called before adding any names.

73 void addCombinator(Chunk chunk) {

74 _combinators.add(chunk);

75 _names.add(new Set());

76 }

77

78 /// Adds a chunk prior to a name to the current combinator.

79 void addName(Chunk chunk) {

80 _names.last.add(chunk);

81 }

82

83 bool isSplit(int value, Chunk chunk) {

84 switch (value) {

85 case 0:

86 // Don't split at all.

87 return false;

88

89 case 1:

90 // Just split at the combinators.

91 return _combinators.contains(chunk);

92

93 case 2:

94 // Split at the combinators and the first set of names.

95 return _isCombinatorSplit(0, chunk);

96

97 case 3:

98 // If there is two combinators, just split at the combinators and the

99 // second set of names.

100 if (_names.length == 2) {

101 // Two sets of combinators, so just split at the combinators and the

102 // second set of names.

103 return _isCombinatorSplit(1, chunk);

104 }

105

106 // Split everything.

107 return true;

108

109 case 4:

110 return true;

111 }

112

113 throw "unreachable";

114 }

115

116 /// Returns `true` if [chunk] is for a combinator or a name in the

117 /// combinator at index [combinator].

118 bool _isCombinatorSplit(int combinator, Chunk chunk) {

119 return _combinators.contains(chunk) \|\| _names[combinator].contains(chunk);

120 }

121

122 String toString() => "Comb${super.toString()}";

123 }

OLD	NEW

« no previous file with comments | « dart_style/lib/src/rule/argument.dart ('k') | dart_style/lib/src/rule/rule.dart » ('j') | no next file with comments »