I suggest that you do not pick XHTML as your first grammar as it is too convoluted and you will get frustrated. Read the getting started guides on the wiki. I see othrs have answered these specific things.
Jim On Aug 28, 2009, at 3:42 AM, stephane richard <[email protected]> wrote: > Hi all. > > I'm trying to build a simple xhtml recognizer (for whitespace > compression) in the purpose of learning antlr. Here's a sample of what > I like to match : > > <html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en" lang="en"> > <head> > <title> > XHTML > Example > </title> > </head> > <body> > <p> > Please Choose a Day: > <br /><br /> > <select name="day"> > <option selected="selected">Monday</option> > <option>Tuesday</option> > <option>Wednesday</option> > </select> > </p> > </body> > </html> > > > This is the grammar : > > grammar Html; > > options { > output=AST; > ASTLabelType=CommonTree; > } > > prog : tag_element * > ; > > element : tag_element > | text_element > ; > > tag_element > : open_tag element* close_tag > | empty_tag > ; > > open_tag: OPEN_TAG name attribute* CLOSE_TAG > ; > > close_tag > : OPEN_TAG '/' name CLOSE_TAG > ; > > empty_tag > : OPEN_TAG name '/' CLOSE_TAG > ; > > attribute > : namespace? ID '=' '"' (options{greedy=false;}: .)* '"' > ; > > namespace > : ID ':' > ; > > > name : ID > ; > text_element > : (~(OPEN_TAG) | WS)+ > ; > > > ID : ('a'..'z'|'A'..'Z')+ ; > INT : '0'..'9'+ ; > NEWLINE : '\r'? '\n' ; > WS : (' '|'\t'|'\n'|'\r')+ {skip();} ; > OPEN_TAG : '<'; > CLOSE_TAG : '>'; > > > My problem is with the text_element rule. I'd like to match everything > until the recognizer find a OPEN_TAG, including whitespaces. While the > actuale rule work, this give me this error : > > [10:32:12] warning(200): Html.g:43:21: Decision can match input such > as "WS" using multiple alternatives: 1, 2, 3 > As a result, alternative(s) 3,2 were disabled for that input > [10:32:12] warning(200): Html.g:43:21: Decision can match input such > as "{CLOSE_TAG..ID, INT..':'}" using multiple alternatives: 1, 3 > As a result, alternative(s) 3 were disabled for that input > [10:32:12] error(201): Html.g:43:21: The following alternatives can > never be matched: 2 > > How could I handle this case properly ? > > Regard, > Kabnot > > List: http://www.antlr.org/mailman/listinfo/antlr-interest > Unsubscribe: > http://www.antlr.org/mailman/options/antlr-interest/your-email-address List: http://www.antlr.org/mailman/listinfo/antlr-interest Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-email-address --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "il-antlr-interest" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/il-antlr-interest?hl=en -~----------~----~----~----~------~----~------~--~---
