65 lines
1.8 KiB
Python
Executable File
65 lines
1.8 KiB
Python
Executable File
# Copyright 2020 the authors.
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# This file is part of Hy, which is free software licensed under the Expat
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# license. See the LICENSE.
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from rply import LexerGenerator
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lg = LexerGenerator()
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# A regexp for something that should end a quoting/unquoting operator
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# i.e. a space or a closing brace/paren/curly
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end_quote_set = r'\s\)\]\}'
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end_quote = r'(?![%s])' % end_quote_set
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identifier = r'[^()\[\]{}\'"\s;]+'
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lg.add('LPAREN', r'\(')
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lg.add('RPAREN', r'\)')
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lg.add('LBRACKET', r'\[')
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lg.add('RBRACKET', r'\]')
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lg.add('LCURLY', r'\{')
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lg.add('RCURLY', r'\}')
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lg.add('HLCURLY', r'#\{')
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lg.add('QUOTE', r'\'%s' % end_quote)
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lg.add('QUASIQUOTE', r'`%s' % end_quote)
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lg.add('UNQUOTESPLICE', r'~@%s' % end_quote)
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lg.add('UNQUOTE', r'~%s' % end_quote)
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lg.add('ANNOTATION', r'\^(?![=%s])' % end_quote_set)
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lg.add('DISCARD', r'#_')
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lg.add('HASHSTARS', r'#\*+')
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lg.add('BRACKETSTRING', r'''(?x)
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\# \[ ( [^\[\]]* ) \[ # Opening delimiter
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\n? # A single leading newline will be ignored
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((?:\n|.)*?) # Content of the string
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\] \1 \] # Closing delimiter
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''')
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lg.add('HASHOTHER', r'#%s' % identifier)
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# A regexp which matches incomplete strings, used to support
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# multi-line strings in the interpreter
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partial_string = r'''(?x)
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(?:u|r|ur|ru|b|br|rb|f|fr|rf)? # prefix
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" # start string
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(?:
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| [^"\\] # non-quote or backslash
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| \\(.|\n) # or escaped single character or newline
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| \\x[0-9a-fA-F]{2} # or escaped raw character
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| \\u[0-9a-fA-F]{4} # or unicode escape
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| \\U[0-9a-fA-F]{8} # or long unicode escape
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)* # one or more times
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'''
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lg.add('STRING', r'%s"' % partial_string)
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lg.add('PARTIAL_STRING', partial_string)
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lg.add('IDENTIFIER', identifier)
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lg.ignore(r';.*(?=\r|\n|$)')
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lg.ignore(r'\s+')
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lexer = lg.build()
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