[antlr-interest] Couldn't catch the exception object at the last token in the rule

[Marwan Ajraoui]

you can define in your members section a method

public String getErrorMessage(RecognitionException e,
                              String[] tokenNames)
{
        	 String msg = e.getMessage();
         if (e instanceof MissingTokenException) {
             MissingTokenException mte = (MissingTokenException) e;
             String tokenName = "";
             if (mte.expecting == Token.EOF) {
                 tokenName = "EOF";
             } else {
                 tokenName = tokenNames[mte.expecting];
             }
         ........


Or u can use @rulecatch.

cheers,


2009/8/21 Marwan Ajraoui <marwan.alephn at gmail.com>:
> r : ID '#' {s = $ID.text; System.out.println("found "+s);} ;
>
> Tow alternatives
>
> 1. take out '#' from ur file.g
>
> or
>
> 2.  Put it in ur input file. so it look like: b #
>
>
> U should read about how it works. Jim did send u a link.
>
> cheers,
>
>
>
>
> 2009/8/19 Ha Luong <haluongvn at gmail.com>:
>> Dear all,
>>
>> I'd like to catch the exception at the last token in the rule. I managed to
>> test some rules to catch the last token mismatch but I couldn't do.
>> Here is my test:
>>
>> 1. In "T.g" :
>>
>> grammar T;
>> options {
>>     language=Java;
>> }
>> @members {
>> String s;
>> }
>>
>> // Alter code generation so catch-clauses get replace with
>> // this action.
>> @rulecatch {
>>
>> catch (RecognitionException e) {
>>     throw e;
>>
>> }
>>
>> }
>> // END:override
>>
>> r : ID '#' {s = $ID.text; System.out.println("found "+s);} ;
>> ID: 'a'..'z'+ ;
>> WS: (' '|'\n'|'\r')+ {skip();} ; // ignore whitespace
>>
>> 2. In "input.txt":
>> b
>>
>> 3. In "Test.java":
>> import org.antlr.runtime.*;
>>
>> public class Test {
>>     public static void main(String[] args) throws Exception {
>>         //ANTLRInputStream input = new ANTLRInputStream(System.in);
>>         //TLexer lexer = new TLexer(input);
>>         TLexer lexer = new TLexer(new ANTLRFileStream("input.txt"));
>>         CommonTokenStream tokens = new CommonTokenStream(lexer);
>>         TParser parser = new TParser(tokens);
>>         try{
>>             parser.r();
>>         }
>>         catch (RecognitionException e) {
>>             System.out.println(e.getClass().toString());
>>             //e.printStackTrace();
>>         }
>>     }
>> }
>>
>> 4. The output in console when I run Test:
>> $ java Test
>> line 0:-1 missing '#' at '<EOF>'
>> found b
>>
>> I don't know why the last token mismatch couldn't catch in the main function
>> of Test. Could you please help me?
>>
>> Thank you very much,
>> Ha Luong
>>
>>
>>
>>
>>
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>>
>
>
>
> --
> Marouane
>



-- 
Marouane