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I don't know any Java Lex and Yacc based tools but can point you to more powerful lexer/parser generators 1.) ANTLR 2.) JavaCC I haven't used JavaCC but can attest that ANTLR is quite good [plus it does C# as well]. In fact the SiXDML parser for the Apache Xindice implementation[0] was built using ANTLR. [0] http://www.25hoursaday.com/sixdml/demo.html -----Original Message----- From: Roger L. Costello [mailto:costello@m...] Sent: Fri 8/23/2002 11:32 AM To: xml-dev@l... Cc: Costello,Roger L. Subject: [OT] Java Lexical Analyzer? 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(); } } ----------------------------------------------------------------- The xml-dev list is sponsored by XML.org <http://www.xml.org>, an initiative of OASIS <http://www.oasis-open.org> The list archives are at http://lists.xml.org/archives/xml-dev/ To subscribe or unsubscribe from this list use the subscription manager: <http://lists.xml.org/ob/adm.pl>
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