[antlr-interest] ANTLR Masquerading as SED
djcordhose
oliver at zeigermann.de
Mon Apr 28 02:56:51 PDT 2003
Hi all,
I may have missed something, but it occurs to me the example
provided in the ANTLR docs is broken:
class T extends Lexer;
options {
k=2;
filter=IGNORE;
charVocabulary = '\3'..'\177';
}
P : "<p>" {System.out.print("<P>");};
BR : "<br>" {System.out.print("<BR>");};
protected
IGNORE
: ( "\r\n" | '\r' | '\n' )
{newline(); System.out.println("");}
| c:. {System.out.print(c);}
;
While this example works with filter=true, i.e. pure filtering, it
fails in this version when trying to parse "<b>" which will lead to
a parse error instead of being filtered. Even when you set lookahead
to k=3 the top level predictive code checks only for the first two
chars.
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