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Add an rply-based lexer

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Nicolas Dandrimont 2013-04-08 09:56:04 +02:00
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commit c8605feaea
1 changed files with 66 additions and 0 deletions
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# 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('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('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
" # end string
''')
lg.add('IDENTIFIER', r'[^()\[\]{}\'"\s;]+')
lg.ignore(r';.*[\r\n]+')
lg.ignore(r'\s+')
lexer = lg.build()