55 lines
1.0 KiB
Plaintext
55 lines
1.0 KiB
Plaintext
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:- object(shell).
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:- info([
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version is 1.0,
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date is 2004/4/29,
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author is 'Paulo Moura',
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comment is 'Simple example of command-line shell parsing.']).
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:- public(parse/2).
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:- mode(parse(@list, -list), zero_or_one).
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:- info(parse/2, [
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comment is 'Parses a sequence of commands.',
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argnames is ['Sequence', 'Commands']]).
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parse(Sequence, Commands) :-
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phrase(commands(Commands), Sequence).
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commands([C| Cs]) -->
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command(C), separator, commands(Cs).
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commands([C]) -->
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command(C).
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separator --> ";".
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whitespace --> " ", whitespace.
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whitespace --> [].
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command(Cd) -->
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whitespace, "cd", whitespace, cdargs(Args), whitespace,
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{atom_concat(cd, Args, Cd)}.
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command(Ls) -->
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whitespace, "ls", whitespace, lsargs(Args), whitespace,
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{atom_concat(ls, Args, Ls)}.
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command(pwd) -->
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whitespace, "pwd", whitespace.
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cdargs(' ~') --> "~".
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cdargs(' ..') --> "..".
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cdargs(' .') --> ".".
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cdargs('') --> [].
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lsargs(' -l') --> "-l".
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lsargs(' -a') --> "-a".
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lsargs('') --> [].
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:- end_object.
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