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git-svn-id: https://linkchecker.svn.sourceforge.net/svnroot/linkchecker/trunk/linkchecker@5 e7d03fd6-7b0d-0410-9947-9c21f3af8025
45 lines
1.3 KiB
Text
45 lines
1.3 KiB
Text
# a GML parser
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# Here is the GML grammar
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# corrected from me because the original at
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# http://www.uni-passau.de/Graphlet/GML had some errors
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#
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# corrections are
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# (1) use instring* in string
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# (2) add character,lowercase,uppercase definitions
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# (3) skip whitespace definition, this is obvious
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# (4) use digit+ in mantissa
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# (5) either intpart or fraction of a real must contain a number
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# (6) comments can be on a separate or at the end of the line
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#
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# gml: list
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# list: (whitespace* key whitespace+ value)*
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# value: integer | real | string | "[" list "]"
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# key: character (character | digit)*
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# integer: sign digit+
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# real: sign (digit+ "." digit* | digit* "." digit+) mantissa
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# string: """ instring* """
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# sign: "+" | "-" |
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# digit: "0"..."9"
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# character: lowercase | uppercase
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# lowercase: "a"..."z"
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# uppercase: "A"..."Z"
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# mantissa: ("E"|"e") sign digit+ |
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# instring: <ASCII except "&" and """> | "&" character+ ";"
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#
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# Note that integers and reals can have prefixed zeros, e.g. 001 is 1
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_class GMLParser
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_code import GMLLexer
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_lex GMLLexer.GMLLexer()
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# manually reduced
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"""
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list: list KEY value (key_value) |
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(endoflist) ;
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value: INTEGER |
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REAL |
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STRING |
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LSQB list RSQB (beginlist) ;
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"""
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