I want to use Java to parse a very simple grammar, for example:
/*comments*/
"aaa" = "bbb"
That's all. I want all tokens (comment, string, equals).
Is there any Java library that can handle this?
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1I didn't get it. Are you looking for something like ANTLR? antlr.orgzengr– zengr2011-11-09 06:06:40 +00:00Commented Nov 9, 2011 at 6:06
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@zengr I believe so. Please follow this: stackoverflow.com/questions/278480/antlr-tutorials and this jnb.ociweb.com/jnb/jnbJun2008.htmKowser– Kowser2011-11-09 07:26:10 +00:00Commented Nov 9, 2011 at 7:26
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Maybe OP only wants the tokens and not an actual parser for the implied simple grammar?Ira Baxter– Ira Baxter2011-11-09 09:47:21 +00:00Commented Nov 9, 2011 at 9:47
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ANTLR might be a little too heavy for such a simple thing. but if you all recommend ANTLR, I'll try it. thanks.disorderdev– disorderdev2011-11-09 18:05:21 +00:00Commented Nov 9, 2011 at 18:05
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3 Answers
You gonna have to write the base grammar that recognize everyone of these tokens and then generate the parser (lexical and syntaxic) with a tool like SableCC or JavaCC (They both produce Java classes). Then you'll have a parser that can parse your language.
I hope it is what you meant by parse a [...] grammar.
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for really basic needs you can use either java.util.StringTokenizer or java.io.StreamTokenizer.
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You can code a recursive descent parser pretty easily for a simple language. See Is there an alternative for flex/bison that is usable on 8-bit embedded systems?
