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

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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

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1 // Copyright (c) 2014, 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.whitespace;

6

7 /// Constants for the number of spaces for various kinds of indentation.

8 class Indent {

9 /// The number of spaces in a block or collection body.

10 static const block = 2;

11

12 /// How much wrapped cascade sections indent.

13 static const cascade = 2;

14

15 /// The number of spaces in a single level of expression nesting.

16 static const expression = 4;

17

18 /// The ":" on a wrapped constructor initialization list.

19 static const constructorInitializer = 4;

20

21 /// The indentation for subsequent variables when a for loop defines multiple

22 /// variables that wrap, like:

23 ///

24 /// for (var a = initializer,

25 /// b = another,

26 /// c = third;

27 /// a + b + c < 100;

28 /// a++) {

29 /// ...

30 /// }

31 static const loopVariable = 8;

32 }

33

34 /// The kind of pending whitespace that has been "written", but not actually

35 /// physically output yet.

36 ///

37 /// We defer actually writing whitespace until a non-whitespace token is

38 /// encountered to avoid trailing whitespace.

39 class Whitespace {

40 /// No whitespace.

41 static const none = const Whitespace._("none");

42

43 /// A single non-breaking space.

44 static const space = const Whitespace._("space");

45

46 /// A single newline.

47 static const newline = const Whitespace._("newline");

48

49 /// A single newline that takes into account the current expression nesting

50 /// for the next line.

51 static const nestedNewline = const Whitespace._("nestedNewline");

52

53 /// A single newline with all indentation eliminated at the beginning of the

54 /// next line.

55 ///

56 /// Used for subsequent lines in a multiline string.

57 static const newlineFlushLeft = const Whitespace._("newlineFlushLeft");

58

59 /// Two newlines, a single blank line of separation.

60 static const twoNewlines = const Whitespace._("twoNewlines");

61

62 /// A space or newline should be output based on whether the current token is

63 /// on the same line as the previous one or not.

64 ///

65 /// In general, we like to avoid using this because it makes the formatter

66 /// less prescriptive over the user's whitespace.

67 static const spaceOrNewline = const Whitespace._("spaceOrNewline");

68

69 /// A split or newline should be output based on whether the current token is

70 /// on the same line as the previous one or not.

71 ///

72 /// In general, we like to avoid using this because it makes the formatter

73 /// less prescriptive over the user's whitespace.

74 static const splitOrNewline = const Whitespace._("splitOrNewline");

75

76 /// One or two newlines should be output based on how many newlines are

77 /// present between the next token and the previous one.

78 ///

79 /// In general, we like to avoid using this because it makes the formatter

80 /// less prescriptive over the user's whitespace.

81 static const oneOrTwoNewlines = const Whitespace._("oneOrTwoNewlines");

82

83 final String name;

84

85 /// Gets the minimum number of newlines contained in this whitespace.

86 int get minimumLines {

87 switch (this) {

88 case Whitespace.newline:

89 case Whitespace.nestedNewline:

90 case Whitespace.newlineFlushLeft:

91 case Whitespace.oneOrTwoNewlines:

92 return 1;

93

94 case Whitespace.twoNewlines:

95 return 2;

96

97 default:

98 return 0;

99 }

100 }

101

102 const Whitespace._(this.name);

103

104 String toString() => name;

105 }

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