text: # Copyright 2017 the authors.
  # This file is part of Hy, which is free software licensed under the Expat
  # license. See the LICENSE.
  
  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('HASHOTHER', r'#[^{]')
  
  # A regexp which matches incomplete strings, used to support
  # multi-line strings in the interpreter
  partial_string = r'''(?x)
      (?:u|r|ur|ru|b|br|rb)? # 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()
  