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[OT] Java Lexical Analyzer?

• To: xml-dev@l...
• Subject: [OT] Java Lexical Analyzer?
• From: "Roger L. Costello" <costello@m...>
• Date: Fri, 23 Aug 2002 14:32:09 -0400
• Cc: "Costello,Roger L." <costello@m...>
• Organization: The MITRE Corporation
• References: <000101c24ab9$ab7482e0$6401a8c0@didierhome>

Hi Folks,

[The XML Parser implementors on the list, no doubt, have experience with
LEX and YACCC.  Hence, I'll pose my question here.]

I am just learning LEX so please bear with me if my question seems
cockeyed...

Can anyone recommend a Java lex tool?  

A lex file is comprised of a series of regular expression/action pairs:

regex  { action }
regex  { action }
...

Thus, what I mean by a "Java LEX tool" is one that would:

   - allow me to specify the action in Java, and
   - the generated lexical analyzer would be in Java

I have looked at a couple of tools:

   - Bumble-Bee Parser Generator
   - JFlex

I tried unsuccessfully running these tools on the very first example
(below) in the lex & yacc book by Levine and Brown.  

Any suggestions on a Java lex generator would be much appreciated. 
/Roger

Sample lex program

%{
/*
 * this sample demonstrates (very) simple regonition:
 * a verb/not a verb.
 */

%}
%%

[\t ]+      /* ignore whitespace */ ;

is |
am |
are |
were |
was |
be |
being |
been |
do |
does |
did |
will |
would |
should |
can |
could |
has |
have |
had |
go         {System.out.println(new String(yytext) + ": is a verb");}

[a-zA-Z]+  {System.out.println(new String(yytext) + ": is a verb");}

.|\n       {System.out.println(new String(yytext));}

%%
	public static void main(String args[]) {
		mylexer lexer = new mylexer();
	}

}

• References:
  • RE: Hobbsian processes
    • From: "Didier PH Martin" <martind@n...>

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