Am Mittwoch 17 Mai 2006 17:24 schrieb Khoa Nguyen: > Any suggestions? If you're not limited to PyParsing, pyrr.ltk/ptk might be appropriate for you here (if you're used to bison/flex). The following file implements a small sample lexer/parser which does exactly what you need. pyrr.ltk (the lexing toolkit) is stable, but pyrr.ptk isn't yet, but it's nevertheless available under:
http://hg.modelnine.org/hg/pyrr as a mercurial repository. I'd advise you to take the version from the repository, if you're interested in it, as my packaged versions always had quirks, which the current head of the repository doesn't, AFAICT. Anyway, the following implements the parser/lexer for you: >>> from pyrr.ltk import LexerBase, IgnoreMatch from pyrr.ptk import ParserBase class SampleLexer(LexerBase): def f(self,match,data): r""" f1 [10]-> /f1/ f2 [10]-> /f2/ f3 [10]-> /f3/ f4 [10]-> /f4/ f5 [10]-> /f5/ f6 [10]-> /f6/ Create your specific matches for each of the fs here... """ return data def fid(self,match,data): r""" fid -> ri/[a-z_][a-z0-9_]*/ Match a record identifier. """ return data def end_of_record(self,match,data): r""" EOR -> /END_OF_RECORD/ Your end of record marker... """ def operators(self,match,data): r""" nl -> e/\n/ c -> /,/ eq -> /=/ Newline is something that I have inserted here... """ def ws(self,match,data): r""" ws -> r/\s+/ Ignore all whitespace that occurs somewhere in the input. """ raise IgnoreMatch class SampleParser(ParserBase): __start__ = "ifile" def ifile(self,data): """ ifile -> record+ """ return dict(data) def record(self,fid,eq,f1,c1,f2,c2,f3,c3,f4,c4,f5,c5,f6,eor,nl): """ record -> /fid/ /eq/ /f1/? /c/ /f2/? /c/ /f3/? /c/ /f4/? /c/ /f5/? /c/ /f6/? /EOR/ /nl/ """ return (fid,(f1,f2,f3,f4,f5,f6)) data = r"""recmark = f1,f2,,f4,f5,f6 END_OF_RECORD recmark2 = f1,f2,f3,f4,,f6 END_OF_RECORD """ print SampleParser.parse(SampleLexer(data)) >>> HTH! --- Heiko. -- http://mail.python.org/mailman/listinfo/python-list
