html/lib/src/utils.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 /// Misc things that were useful when porting the code from Python.

2 library utils;

3

4 import 'constants.dart';

5

6 typedef bool Predicate();

7

8 class Pair<F, S> {

9 final F first;

10 final S second;

11

12 const Pair(this.first, this.second);

13

14 int get hashCode => 37 * first.hashCode + second.hashCode;

15 bool operator ==(other) => other.first == first && other.second == second;

16 }

17

18 int parseIntRadix(String str, [int radix = 10]) {

19 int val = 0;

20 for (int i = 0; i < str.length; i++) {

21 var digit = str.codeUnitAt(i);

22 if (digit >= LOWER_A) {

23 digit += 10 - LOWER_A;

24 } else if (digit >= UPPER_A) {

25 digit += 10 - UPPER_A;

26 } else {

27 digit -= ZERO;

28 }

29 val = val * radix + digit;

30 }

31 return val;

32 }

33

34 bool any(List<bool> iterable) => iterable.any((f) => f);

35

36 bool startsWithAny(String str, List<String> prefixes) {

37 for (var prefix in prefixes) {

38 if (str.startsWith(prefix)) {

39 return true;

40 }

41 }

42 return false;

43 }

44

45 // Like the python [:] operator.

46 List slice(List list, int start, [int end]) {

47 if (end == null) end = list.length;

48 if (end < 0) end += list.length;

49

50 // Ensure the indexes are in bounds.

51 if (end < start) end = start;

52 if (end > list.length) end = list.length;

53 return list.sublist(start, end);

54 }

55

56 bool allWhitespace(String str) {

57 for (int i = 0; i < str.length; i++) {

58 if (!isWhitespaceCC(str.codeUnitAt(i))) return false;

59 }

60 return true;

61 }

62

63 String padWithZeros(String str, int size) {

64 if (str.length == size) return str;

65 var result = new StringBuffer();

66 size -= str.length;

67 for (int i = 0; i < size; i++) result.write('0');

68 result.write(str);

69 return result.toString();

70 }

71

72 // TODO(jmesserly): this implementation is pretty wrong, but I need something

73 // quick until dartbug.com/1694 is fixed.

74 /// Format a string like Python's % string format operator. Right now this only

75 /// supports a [data] dictionary used with %s or %08x. Those were the only

76 /// things needed for [errorMessages].

77 String formatStr(String format, Map data) {

78 if (data == null) return format;

79 data.forEach((key, value) {

80 var result = new StringBuffer();

81 var search = '%($key)';

82 int last = 0,

83 match;

84 while ((match = format.indexOf(search, last)) >= 0) {

85 result.write(format.substring(last, match));

86 match += search.length;

87

88 int digits = match;

89 while (isDigit(format[digits])) {

90 digits++;

91 }

92 int numberSize;

93 if (digits > match) {

94 numberSize = int.parse(format.substring(match, digits));

95 match = digits;

96 }

97

98 switch (format[match]) {

99 case 's':

100 result.write(value);

101 break;

102 case 'd':

103 var number = value.toString();

104 result.write(padWithZeros(number, numberSize));

105 break;

106 case 'x':

107 var number = value.toRadixString(16);

108 result.write(padWithZeros(number, numberSize));

109 break;

110 default:

111 throw "not implemented: formatStr does not support format "

112 "character ${format[match]}";

113 }

114

115 last = match + 1;

116 }

117

118 result.write(format.substring(last, format.length));

119 format = result.toString();

120 });

121

122 return format;

123 }

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