old_contents: # Copyright (c) 2013 Nicolas Dandrimont <nicolas.dandrimont@crans.org>
  #
  # Permission is hereby granted, free of charge, to any person obtaining a
  # copy of this software and associated documentation files (the "Software"),
  # to deal in the Software without restriction, including without limitation
  # the rights to use, copy, modify, merge, publish, distribute, sublicense,
  # and/or sell copies of the Software, and to permit persons to whom the
  # Software is furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  # DEALINGS IN THE SOFTWARE.
  
  from rply import LexerGenerator
  
  
  lg = LexerGenerator()
  
  
  # A regexp for something that should end a quoting/unquoting operator
  # i.e. a space or a closing brace/paren/curly
  end_quote = r'(?![\s\)\]\}])'
  
  
  lg.add('LPAREN', r'\(')
  lg.add('RPAREN', r'\)')
  lg.add('LBRACKET', r'\[')
  lg.add('RBRACKET', r'\]')
  lg.add('LCURLY', r'\{')
  lg.add('RCURLY', r'\}')
  lg.add('HLCURLY', r'#\{')
  lg.add('QUOTE', r'\'%s' % end_quote)
  lg.add('QUASIQUOTE', r'`%s' % end_quote)
  lg.add('UNQUOTESPLICE', r'~@%s' % end_quote)
  lg.add('UNQUOTE', r'~%s' % end_quote)
  lg.add('HASHBANG', r'#!.*[^\r\n]')
  lg.add('HASHREADER', r'#[^{]')
  
  # A regexp which matches incomplete strings, used to support
  # multi-line strings in the interpreter
  partial_string = r'''(?x)
      (?:u|r|ur|ru)? # prefix
      "  # start string
      (?:
         | [^"\\]             # non-quote or backslash
         | \\.                # or escaped single character
         | \\x[0-9a-fA-F]{2}  # or escaped raw character
         | \\u[0-9a-fA-F]{4}  # or unicode escape
         | \\U[0-9a-fA-F]{8}  # or long unicode escape
      )* # one or more times
  '''
  
  lg.add('STRING', r'%s"' % partial_string)
  lg.add('PARTIAL_STRING', partial_string)
  
  lg.add('IDENTIFIER', r'[^()\[\]{}\'"\s;]+')
  
  
  lg.ignore(r';.*(?=\r|\n|$)')
  lg.ignore(r'\s+')
  
  
  lexer = lg.build()
  
new_contents: # Copyright (c) 2013 Nicolas Dandrimont <nicolas.dandrimont@crans.org>
  #
  # Permission is hereby granted, free of charge, to any person obtaining a
  # copy of this software and associated documentation files (the "Software"),
  # to deal in the Software without restriction, including without limitation
  # the rights to use, copy, modify, merge, publish, distribute, sublicense,
  # and/or sell copies of the Software, and to permit persons to whom the
  # Software is furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  # DEALINGS IN THE SOFTWARE.
  
  from rply import LexerGenerator
  
  
  lg = LexerGenerator()
  
  
  # A regexp for something that should end a quoting/unquoting operator
  # i.e. a space or a closing brace/paren/curly
  end_quote = r'(?![\s\)\]\}])'
  
  
  lg.add('LPAREN', r'\(')
  lg.add('RPAREN', r'\)')
  lg.add('LBRACKET', r'\[')
  lg.add('RBRACKET', r'\]')
  lg.add('LCURLY', r'\{')
  lg.add('RCURLY', r'\}')
  lg.add('HLCURLY', r'#\{')
  lg.add('QUOTE', r'\'%s' % end_quote)
  lg.add('QUASIQUOTE', r'`%s' % end_quote)
  lg.add('UNQUOTESPLICE', r'~@%s' % end_quote)
  lg.add('UNQUOTE', r'~%s' % end_quote)
  lg.add('HASHBANG', r'#!.*[^\r\n]')
  lg.add('HASHREADER', r'#[^{]')
  
  # A regexp which matches incomplete strings, used to support
  # multi-line strings in the interpreter
  partial_string = r'''(?x)
      (?:u|r|ur|ru)? # prefix
      "  # start string
      (?:
         | [^"\\]             # non-quote or backslash
         | \\(.|\n)           # or escaped single character or newline
         | \\x[0-9a-fA-F]{2}  # or escaped raw character
         | \\u[0-9a-fA-F]{4}  # or unicode escape
         | \\U[0-9a-fA-F]{8}  # or long unicode escape
      )* # one or more times
  '''
  
  lg.add('STRING', r'%s"' % partial_string)
  lg.add('PARTIAL_STRING', partial_string)
  
  lg.add('IDENTIFIER', r'[^()\[\]{}\'"\s;]+')
  
  
  lg.ignore(r';.*(?=\r|\n|$)')
  lg.ignore(r'\s+')
  
  
  lexer = lg.build()
  
subject: Fix #831