Examples of org.jnode.shell.syntax.MuSyntax

org.jnode.shell.syntax.MuSyntax
The MuSyntax class and related classes provide an in-memory representation of BNF-like grammars for use in the command line syntax subsystem. The key difference between the Mu and BNF grammar families is that the Mu uses dynamic token recognition and state capture via the MuArgument to Argument binding; e.g. "fred" might be a File or a URI, depending on context. By contrast, BNF assumes a separate context insensitive token recognition mechanism.
It is a given that a MuSyntax tree may represent an ambiguous grammar; i.e. that it may allow multiple parses for a given input token sequence. In reality this is pretty much unavoidable given the way we handle tokenization. @author crawley@jnode.org

        IntegerArgument intArg = new IntegerArgument("intArg", Argument.MULTIPLE);
        FileArgument fileArg = new FileArgument("fileArg", Argument.MULTIPLE);
        ArgumentBundle bundle = new ArgumentBundle(intArg, fileArg);


        // <start> ::= <<intArg>> <<fileArg>>
        MuSyntax syntax = new MuSequence(new MuArgument("intArg"), new MuArgument("fileArg"));
        MuParser parser = new MuParser();
        CommandLine cl;


        cl = new CommandLine(new String[] {"1", "x"});
        parser.parse(syntax, null, cl.tokenIterator(), bundle);

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        IntegerArgument intArg = new IntegerArgument("intArg", Argument.MULTIPLE);
        FileArgument fileArg = new FileArgument("fileArg", Argument.MULTIPLE);
        ArgumentBundle bundle = new ArgumentBundle(intArg, fileArg);


        // <start> :: = <<intArg>> | <<fileArg>>
        MuSyntax syntax = new MuAlternation(new MuArgument("intArg"), new MuArgument("fileArg"));
        MuParser parser = new MuParser();
        CommandLine cl;


        cl = new CommandLine(new String[] {"1"});
        parser.parse(syntax, null, cl.tokenIterator(), bundle);

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        IntegerArgument intArg = new IntegerArgument("intArg", Argument.MULTIPLE);
        FileArgument fileArg = new FileArgument("fileArg", Argument.MULTIPLE);
        ArgumentBundle bundle = new ArgumentBundle(intArg, fileArg);


        // <root> ::= <<fileArg>> | ( <<intArg>> <root> )
        MuSyntax syntax =
                new MuAlternation("root", new MuArgument("fileArg"), new MuSequence(new MuArgument(
                        "intArg"), new MuBackReference("root")));
        syntax.resolveBackReferences();


        MuParser parser = new MuParser();
        CommandLine cl;


        cl = new CommandLine(new String[] {"x"});

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        IntegerArgument intArg = new IntegerArgument("intArg", Argument.MULTIPLE);
        FileArgument fileArg = new FileArgument("fileArg", Argument.MULTIPLE);
        ArgumentBundle bundle = new ArgumentBundle(intArg, fileArg);


        // <root> ::= ( <<intArg>> <root> ) | <<fileArg>>
        MuSyntax syntax =
                new MuAlternation("root", new MuSequence(new MuArgument("intArg"),
                        new MuBackReference("root")), new MuArgument("fileArg"));
        syntax.resolveBackReferences();
        MuParser parser = new MuParser();
        CommandLine cl;


        cl = new CommandLine(new String[] {"x"});
        parser.parse(syntax, null, cl.tokenIterator(), bundle);

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        IntegerArgument intArg = new IntegerArgument("intArg", Argument.MULTIPLE);
        ArgumentBundle bundle = new ArgumentBundle(intArg, smallArg, bigArg);


        // <root> ::= ( ( <<intArg>> <root> ) | ( <<bigArg>> <<smallArg>> ) ) |
        // ( ( <<intArg>> <root> ) | <<bigArg>> ) )
        MuSyntax syntax = new MuAlternation("root", new MuAlternation(new MuSequence(new MuArgument("intArg"),
            new MuBackReference("root")), new MuSequence(new MuArgument("bigArg"), new MuArgument("smallArg"))),
            new MuAlternation(new MuSequence(new MuArgument("intArg"), new MuBackReference("root")),
                new MuArgument("bigArg")));
        syntax.resolveBackReferences();


        MuParser parser = new MuParser();
        CommandLine cl;


        cl = new CommandLine(new String[] {"BIG"});

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Related Classes of org.jnode.shell.syntax.MuSyntax

org.jnode.test.shell.syntax.MuParserTest

org.jnode.test.shell.syntax.MuParserTest2

org.jnode.test.shell.syntax.MuSyntaxTest

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