scratch – Blame information for rev 133
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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 75 | office | 1 | |
| 2 | Utils = require './Utils' |
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| 3 | Pattern = require './Pattern' |
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| 4 | |||
| 5 | # Unescaper encapsulates unescaping rules for single and double-quoted YAML strings. |
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| 6 | # |
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| 7 | class Unescaper |
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| 8 | |||
| 9 | # Regex fragment that matches an escaped character in |
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| 10 | # a double quoted string. |
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| 11 | @PATTERN_ESCAPED_CHARACTER: new Pattern '\\\\([0abt\tnvfre "\\/\\\\N_LP]|x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}|U[0-9a-fA-F]{8})'; |
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| 12 | |||
| 13 | |||
| 14 | # Unescapes a single quoted string. |
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| 15 | # |
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| 16 | # @param [String] value A single quoted string. |
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| 17 | # |
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| 18 | # @return [String] The unescaped string. |
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| 19 | # |
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| 20 | @unescapeSingleQuotedString: (value) -> |
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| 21 | return value.replace(/\'\'/g, '\'') |
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| 22 | |||
| 23 | |||
| 24 | # Unescapes a double quoted string. |
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| 25 | # |
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| 26 | # @param [String] value A double quoted string. |
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| 27 | # |
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| 28 | # @return [String] The unescaped string. |
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| 29 | # |
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| 30 | @unescapeDoubleQuotedString: (value) -> |
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| 31 | @_unescapeCallback ?= (str) => |
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| 32 | return @unescapeCharacter(str) |
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| 33 | |||
| 34 | # Evaluate the string |
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| 35 | return @PATTERN_ESCAPED_CHARACTER.replace value, @_unescapeCallback |
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| 36 | |||
| 37 | |||
| 38 | # Unescapes a character that was found in a double-quoted string |
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| 39 | # |
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| 40 | # @param [String] value An escaped character |
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| 41 | # |
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| 42 | # @return [String] The unescaped character |
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| 43 | # |
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| 44 | @unescapeCharacter: (value) -> |
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| 45 | ch = String.fromCharCode |
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| 46 | switch value.charAt(1) |
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| 47 | when '0' |
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| 48 | return ch(0) |
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| 49 | when 'a' |
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| 50 | return ch(7) |
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| 51 | when 'b' |
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| 52 | return ch(8) |
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| 53 | when 't' |
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| 54 | return "\t" |
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| 55 | when "\t" |
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| 56 | return "\t" |
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| 57 | when 'n' |
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| 58 | return "\n" |
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| 59 | when 'v' |
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| 60 | return ch(11) |
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| 61 | when 'f' |
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| 62 | return ch(12) |
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| 63 | when 'r' |
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| 64 | return ch(13) |
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| 65 | when 'e' |
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| 66 | return ch(27) |
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| 67 | when ' ' |
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| 68 | return ' ' |
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| 69 | when '"' |
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| 70 | return '"' |
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| 71 | when '/' |
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| 72 | return '/' |
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| 73 | when '\\' |
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| 74 | return '\\' |
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| 75 | when 'N' |
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| 76 | # U+0085 NEXT LINE |
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| 77 | return ch(0x0085) |
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| 78 | when '_' |
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| 79 | # U+00A0 NO-BREAK SPACE |
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| 80 | return ch(0x00A0) |
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| 81 | when 'L' |
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| 82 | # U+2028 LINE SEPARATOR |
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| 83 | return ch(0x2028) |
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| 84 | when 'P' |
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| 85 | # U+2029 PARAGRAPH SEPARATOR |
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| 86 | return ch(0x2029) |
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| 87 | when 'x' |
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| 88 | return Utils.utf8chr(Utils.hexDec(value.substr(2, 2))) |
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| 89 | when 'u' |
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| 90 | return Utils.utf8chr(Utils.hexDec(value.substr(2, 4))) |
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| 91 | when 'U' |
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| 92 | return Utils.utf8chr(Utils.hexDec(value.substr(2, 8))) |
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| 93 | else |
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| 94 | return '' |
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| 95 | |||
| 96 | module.exports = Unescaper |