Thanks for your input. So here is the whole thing with two use cases that are
not giving me the expected results...
(Sorry for the long post)
INPUT = abc def zyx toto
RESULT = (DEFAULT_OP abc def) (DEFAULT_OP zyx toto)
EXPECTED = (DEFAULT_OP (DEFAULT_OP abc def) (DEFAULT_OP zyx toto))
INPUT = software engineer OR java programmer
RESULT = (DEFAULT_OP software (OR engineer java)) programmer
EXPECTED = (DEFAULT_OP (DEFAULT_OP software (OR engineer java)) programmer)
I'm also having some trouble using the Interpreter within Eclipse.
The same expressions are not working in the interpreter. It fails to generate
the
tree with a "NoViableAltException at input 'abc' " (for the first case).
I don't think this is related to my other problem since I can't get it to
generate any tree.
Thanks again for your time and comments
----------------------------------------------------------------------------------------------------------
Grammar (validation by building a tree and trying to insert missing operators)
----------------------------------------------------------------------------------------------------------
grammar MyGrammar;
options {
language = Java;
output = AST;
ASTLabelType = CommonTree;
}
// Rules to build the tree representation of our expression...
query
: and_expr+ EOF!
;
// Each AND expression can contain OR expressions...
and_expr
: (expr expr+) => default_op
| (u1=or_expr (AND^ u2=or_expr)*)
;
// A OR expression contains one or more expression
or_expr
: u1=expr (OR^ u2=expr)*
;
default_op
: (e1=or_expr e2=or_expr) -> ^(DEFAULT_OP $e1 $e2)
;
expr
: (NOT^)? (operand)
;
// The leafs of the tree.. Words, sentence and so on...
// Note that an expression such as '-word' is rewritten in its 'NOT word' form
operand
: (f=FIELD^)(o=operand)
| PREFIX
| WORD
| SENTENCE
| WORDLIST
| NEGATIVE(w=PREFIX|w=WORD|w=SENTENCE|w=WORDLIST) -> ^(NOT $w)
| MUST
| LPAREN! and_expr RPAREN!
;
// Lexer ...
NEGATIVE : '-';
LPAREN : '(' ;
RPAREN : ')' ;
DOUBLEQUOTE : '"';
STAR : '*';
AND : 'AND' | '+';
OR : 'OR';
NOT : 'NOT';
DEFAULT_OP : 'DEF_OP';
FIELD : ('title'|'TITLE'|'Title')(FIELDSEPARATOR);
WS : (WSCHAR)+ { $channel=HIDDEN; };
PREFIX : WORDCHAR+(STAR);
WORD : WORDCHAR+(('-'|'+')WORDCHAR*)*;
SENTENCE : ((DOUBLEQUOTE)(~(DOUBLEQUOTE))*(DOUBLEQUOTE));
WORDLIST : ((PREFIX | WORD | SENTENCE)(','(WS)* (PREFIX | WORD |
SENTENCE))+);
MUST : '+'(PREFIX|WORD|SENTENCE|WORDLIST);
fragment WORDCHAR : (~( WSCHAR | LPAREN | RPAREN | '-' |':' | '+' | ',' |
STAR | DOUBLEQUOTE) );
fragment FIELDSEPARATOR : ':';
fragment WSCHAR : ( ' ' | '\t' | '\r' | '\n');
================================= END OF GRAMMAR ==========================
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Bart Kiers
Sent: May-04-11 10:21 AM
To: [email protected]
Subject: Re: [antlr-interest] Inserting missing nodes
On Wed, May 4, 2011 at 4:12 PM, Jean-Sebastien Vachon <
[email protected]> wrote:
> No one can help me with this? :S
> Let me know if something is not clear. I need to fix this issue as
> soon as I can.
>
> Thanks
The fact that you didn't provide the lexer rules (although they might be
straight-forward as you mentioned), and you didn't mention what input you're
specifically having problems with parsing (the following is a bit
vague: *"... but I can't get it to parse everything I'm throwing at it ..."*),
might be some reasons why you haven't been answered.
Regards,
Bart.
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