Dear all, I am trying to parse a message that contains parameters values like <PARAM_NAME> <VALUE>, for instance "STATION EST1". Here is a very simple extract of my grammar for one of these parameters (the one given in the above example):
grammar test; KEYWORD_STATION : 'STATION'; DIGIT : '0'..'9'; LETTER : 'a'..'z' | 'A'..'Z'; SPACE : ' '; stationParameter : KEYWORD_STATION SPACE stationName; stationName : LETTER LETTER LETTER DIGIT; The point is that when I try to parse my example message (STATION EST1), I get a MismatchTokenException at the point where the parser attempts to read the last "ST1". After some analysis, I understood that the lexer generated the following tokens: KEYWORD_STATION SPACE LETTER for the string "STATION E" and then attempted to match the remaining "ST1" with KEYWORD_STATION but failed to complete it. At this point, I would expect the lexer to backtrack to the beginning of 'ST1' and then match it with LETTER LETTER DIGIT, but it doesn't. I have tried various combinations of "backtrack", "memorize" and "k" options without any success. I must have missed something. (Should it help, I use ANTLRWorks 1.4). Please could you tell me how to proceed in order to make the lexer backtrack and try other alternatives when a keyword of my language is not exactly matched ? Thanks in advance for your help. Best Regards, Philippe Coujoulou. The information in this e-mail is confidential. The contents may not be disclosed or used by anyone other than the addressee. Access to this e-mail by anyone else is unauthorised. If you are not the intended recipient, please notify Airbus immediately and delete this e-mail. Airbus cannot accept any responsibility for the accuracy or completeness of this e-mail as it has been sent over public networks. If you have any concerns over the content of this message or its Accuracy or Integrity, please contact Airbus immediately. All outgoing e-mails from Airbus are checked using regularly updated virus scanning software but you should take whatever measures you deem to be appropriate to ensure that this message and any attachments are virus free. 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.
