97 lines
2.7 KiB
CoffeeScript
97 lines
2.7 KiB
CoffeeScript
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Utils = require './Utils'
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Pattern = require './Pattern'
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# Unescaper encapsulates unescaping rules for single and double-quoted YAML strings.
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#
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class Unescaper
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# Regex fragment that matches an escaped character in
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# a double quoted string.
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@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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# Unescapes a single quoted string.
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#
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# @param [String] value A single quoted string.
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#
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# @return [String] The unescaped string.
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#
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@unescapeSingleQuotedString: (value) ->
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return value.replace(/\'\'/g, '\'')
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# Unescapes a double quoted string.
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#
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# @param [String] value A double quoted string.
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#
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# @return [String] The unescaped string.
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#
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@unescapeDoubleQuotedString: (value) ->
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@_unescapeCallback ?= (str) =>
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return @unescapeCharacter(str)
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# Evaluate the string
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return @PATTERN_ESCAPED_CHARACTER.replace value, @_unescapeCallback
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# Unescapes a character that was found in a double-quoted string
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#
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# @param [String] value An escaped character
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#
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# @return [String] The unescaped character
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#
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@unescapeCharacter: (value) ->
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ch = String.fromCharCode
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switch value.charAt(1)
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when '0'
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return ch(0)
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when 'a'
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return ch(7)
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when 'b'
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return ch(8)
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when 't'
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return "\t"
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when "\t"
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return "\t"
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when 'n'
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return "\n"
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when 'v'
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return ch(11)
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when 'f'
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return ch(12)
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when 'r'
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return ch(13)
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when 'e'
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return ch(27)
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when ' '
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return ' '
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when '"'
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return '"'
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when '/'
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return '/'
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when '\\'
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return '\\'
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when 'N'
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# U+0085 NEXT LINE
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return ch(0x0085)
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when '_'
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# U+00A0 NO-BREAK SPACE
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return ch(0x00A0)
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when 'L'
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# U+2028 LINE SEPARATOR
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return ch(0x2028)
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when 'P'
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# U+2029 PARAGRAPH SEPARATOR
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return ch(0x2029)
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when 'x'
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return Utils.utf8chr(Utils.hexDec(value.substr(2, 2)))
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when 'u'
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return Utils.utf8chr(Utils.hexDec(value.substr(2, 4)))
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when 'U'
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return Utils.utf8chr(Utils.hexDec(value.substr(2, 8)))
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else
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return ''
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module.exports = Unescaper
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