JAVACC - Problems if coments lines
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JAVACC - Problems if coments lines
by Douglas Alves-3
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Good night.
First, sorry for my english. I'm a student of Computer Scientist in Brazil. I'm work in my monografy with JavaCC. I'm having trouble writing a token that defines several lines of comments, as in C + +. I am using this definition: < COMENTARIO_VARIAS_LINHAS: "/*" (~[])* "*/" > But in this case also includes (~[])* the end of the comment "*/", error occurs and the time to acknowledge the comments of several lines. If you have any suggestions, thank you now. Regards, Saudações, Douglas Alves |
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Re: JAVACC - Problems if coments lines
by J.Chris Findlay
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Most comment parsing uses lexical states to achieve this without clash
with other tokens (since the longest match wins). So when you encounter the "/*" you switch to a new state, and in that state there are only 2 tokens defined, "*/" to return you to the previous lexical state and ~[] to eat any other characters _one_at_a_time_ so that the endOfComment token is always matchable. On Wed, Apr 22, 2009 at 12:48 PM, Douglas Alves <knidel@...> wrote: > Good night. > First, sorry for my english. > I'm a student of Computer Scientist in Brazil. > > I'm work in my monografy with JavaCC. > > I'm having trouble writing a token that defines several lines of comments, > as in C + +. I am using this definition: > < COMENTARIO_VARIAS_LINHAS: "/*" (~[])* "*/" > > > But in this case also includes (~[])* the end of the comment "*/", error > occurs and the time to acknowledge the comments of several lines. If you > have any suggestions, thank you now. > Regards, > > > Saudações, > Douglas Alves > -- - J.Chris Findlay (c: --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@... For additional commands, e-mail: users-help@... |
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Re: Re: JAVACC - Problems if coments lines
by J.Chris Findlay
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Thanx for the translation and example (c:
On Fri, Apr 24, 2009 at 4:47 AM, Kenneth Reid Beesley <krbeesley@...> wrote: > Hola Douglas, > > Desculpe meu português. > > O tokenizador de JavaCC é sempre em um estado ou em outro. Geralment, o > tokenizador > começa no estado DEFAULT. Depois de encontrar "/*", o tokenizador deve > mudar (?) > de DEFAULT a um outro estado "dentro de comentário". Por exemplo > > SKIP: { > "/*" : IN_DELIMITED_COMMENT > | " " > | "\n" > | "\r" > | "\t" > | "\f" > } > > Neste estado IN_DELIMITED_COMMENT, o tokenizador deve aceitar qualquer > caráter, > ou sequencia de caracteres, mas depois de aceitar "*/", o estado deve voltar > ao estado DEFAULT. > > > // special lexical state for skipping a delimited comment > < IN_DELIMITED_COMMENT > > SKIP: { > // find */ and shift back to DEFAULT state > "*/": DEFAULT > | > // or just match and skip any character > < ~[] > > } > > Você pode ver esta solução nas FAQ > http://www.engr.mun.ca/~theo/JavaCC-FAQ/javacc-faq-moz.htm > > Boa sorte, > > Ken > > > On 23 Apr 2009, at 02:17 >> >> ---------------------------------------------------------------------- >> >> From: Douglas Alves <knidel@...> >> Date: 21 April 2009 18:48:35 MDT >> To: users@... >> Subject: JAVACC - Problems if coments lines >> >> >> Good night. >> First, sorry for my english. >> I'm a student of Computer Scientist in Brazil. >> >> I'm work in my monografy with JavaCC. >> >> I'm having trouble writing a token that defines several lines of comments, >> as in C + +. I am using this definition: >> < COMENTARIO_VARIAS_LINHAS: "/*" (~[])* "*/" > >> >> But in this case also includes (~[])* the end of the comment "*/", error >> occurs and the time to acknowledge the comments of several lines. If you >> have any suggestions, thank you now. >> Regards, >> >> >> Saudações, >> Douglas Alves >> >> > > > ****************************** > Kenneth R. Beesley, D.Phil. > P.O. Box 540475 > North Salt Lake, UT > 84054 USA > > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscribe@... > For additional commands, e-mail: users-help@... > > -- - J.Chris Findlay (c: --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@... For additional commands, e-mail: users-help@... |
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