Hello all,
Writing a parser for some ugly grammar I came across a problem I do not know
how to approach. Here is a sample grammar illustrating the problem:
grammar test;
program : (statement)*;
statement
: RawData
| Identifier ';'
;
RawData: 'data;' ((options {greedy=false;} : .)* ';;')? ;
Identifier : ('a'..'z')+;
WhiteSpace : (' ' | '\t' | '\r\n' | '\r')+ { $channel=HIDDEN; };
The RawData can contain data ended with ‘;;’ or can be empty. Two sample valid
inputs:
data; some raw data here;; identifier;
data; identifier;
The parser does not correctly recognize the second input (mismatched character
'<EOF>' expecting ';') .
Parser does not realize that what follows ‘data’ keyword is not followed by
‘;;’ so it is not "raw data" and should be interpreted as Identifier.
I am clueless. Could anyone help?
Thomas
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