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