[antlr-interest] Re: generated code not compilable.

[Terence Parr]

Oh.  That's an easy one.  Use latest download; 2.7.2 fixes that problem.

Ter

On Tuesday, October 29, 2002, at 09:55  AM, praveen_c wrote:

> Here is the nextToken() method that's generated. I numbered each
> line. Line 14 is invalid, the word "true" must be surrounded by ().
> Also line 23 gets an illegal start of the expression. Let me know if
> you need more info. There are a couple more identical things.
>
> 1 public Token nextToken() throws TokenStreamException {
> 2	Token theRetToken=null;
> 3 tryAgain:
> 4	for (;;) {
> 5		Token _token = null;
> 6		int _ttype = Token.INVALID_TYPE;
> 7		resetText();
> 8		try {   // for char stream error handling
> 9			try {   // for lexical error handling
> 10				if ((LA(1)=='<') && (LA(2)=='@')) {
> 11					mTAG(true);
> 12					theRetToken=_returnToken;
> 13				}
> 14				else if true {
> 15					mTEXT(true);
> 16					theRetToken=_returnToken;
> 17				}
> 18				else {
> 19					if (LA(1)==EOF_CHAR) {uponEOF
> (); _returnToken = makeToken(Token.EOF_TYPE);}
> 20				else {throw new
> NoViableAltForCharException((char)LA(1), getFilename(), getLine());}
> 21				}
> 22				
> 23				if ( _returnToken==null ) continue
> tryAgain; // found SKIP token
> 24				_ttype = _returnToken.getType();
> 25				_returnToken.setType(_ttype);
> 26				return _returnToken;
> 27			}
> 28			catch (RecognitionException e) {
> 29				throw new
> TokenStreamRecognitionException(e);
> 30			}
> 31		}
> 32		catch (CharStreamException cse) {
> 33			if ( cse instanceof CharStreamIOException ) {
> 34				throw new TokenStreamIOException
> (((CharStreamIOException)cse).io);
> 35			}
> 36			else {
> 37				throw new TokenStreamException
> (cse.getMessage());
> 38			}
> 39		}
> 40	}
> 41 }
>
>
> --- In antlr-interest at y..., Terence Parr <parrt at j...> wrote:
>> What is the compilation error and where?
>>
>> Terence
>>
>> On Tuesday, October 29, 2002, at 08:36  AM, praveen_c wrote:
>>
>>> For some reason when I use the charVocabulary option in the
> following
>>> grammar, I get code that CANNOT be compiled. When I remove it, I
> get
>>> compilable code. Is there something wrong in the grammar?
>>>
>>> Any help would be greatly appreciated. Comments on the grammar are
>>> welcome.
>>>
>>> ---------------------------GRAMMAR FILE---------------------------
> ----
>>> header { package tom; }
>>>
>>> class SimpleParser extends Parser;
>>>
>>> template: (TEXT | TAG)+;
>>>
>>> class SimpleLexer extends Lexer;
>>> options {
>>>     k=2;
>>>     testLiterals=false;
>>>     charVocabulary = '\3'..'\377' | '\u1000'..'\u1fff';
>>> }
>>>
>>> {
>>>     public boolean isEndOfText() throws antlr.CharStreamException
> {
>>>         char char1 = LA(1);
>>>         if (char1 == '<') {
>>>             char char2 = LA(2);
>>>             if (char2 == '@') { // "<@"
>>>                 return true;
>>>             } else if (char2 == '/') { // "</"
>>>                 //ignore any white space
>>>                 int i = forwardToNonWhiteSpace(3);
>>>
>>>                 if (
>>>                     (LA(i++) == 'l') &&
>>>                     (LA(i++) == 'o') &&
>>>                     (LA(i++) == 'o') &&
>>>                     (LA(i++) == 'p')
>>>                    ) {
>>>
>>>                    //match whitespace.
>>>                    i = forwardToNonWhiteSpace(i);
>>>
>>>                    if (LA(i++) == '>') { // "</loop>"
>>>                         return true;
>>>                    } else {
>>>                         return false;
>>>                    }
>>>                } else {
>>>                     return false;
>>>                }
>>>             } else { // it began with '<' but doesn't have
> anything
>>> meaningful after that.
>>>                 return false;
>>>             }
>>>         } else if (char1 == EOF_CHAR) { //End-of-file reached,
> can't
>>> proceed further.
>>>             return true;
>>>         } else { //doesn't begin with '<', so it's a normal char,
> not
>>> a special one.
>>>             return false;
>>>         }
>>>     }
>>>
>>>     public int forwardToNonWhiteSpace(int i) throws
>>> antlr.CharStreamException {
>>>         char c = LA(i);
>>>         while ( (c==' ') || (c == '\t') || (c == '\n') ) {
>>>             i++;
>>>             c = LA(i);
>>>         }
>>>         return i;
>>>     }
>>> }
>>>
>>> protected
>>> WS : ( ' ' | '\t' | '\n' )* ;
>>>
>>> TAG:     (options
>>>             {
>>>                 generateAmbigWarnings=false;
>>>             }:
>>>                 "<@"
>>>                 (
>>>                     ("include") => INCLUDE { $setType(INCLUDE); }
> |
>>>                     ("loop")    => LOOP { $setType(LOOP); } |
>>>                     TEXT
>>>                 )
>>>                 '>'
>>>         );
>>>
>>> protected
>>> INCLUDE: "include" ;
>>>
>>> protected
>>> LOOP: "loop" ;
>>>
>>> protected
>>> END_LOOP: "</" LOOP '>';
>>>
>>> TEXT:   (END_LOOP) => END_LOOP { $setType(END_LOOP); } |
>>>         (
>>>         options
>>>             {
>>>                 generateAmbigWarnings=false;
>>>             }:
>>>             ( { !isEndOfText() }? . )*
>>>         );
>>>
>>>
>>>
>>>
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>>>
>>>
>> --
>> Co-founder, http://www.jguru.com
>> Creator, ANTLR Parser Generator: http://www.antlr.org
>> Lecturer in Comp. Sci., University of San Francisco
>
>
>
>
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>
>
--
Co-founder, http://www.jguru.com
Creator, ANTLR Parser Generator: http://www.antlr.org
Lecturer in Comp. Sci., University of San Francisco


 

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