> See TDAR pg 285.
>
> A parser rule is going to work well.
I tweaked the grammar (below) to get it to compile but am still not seeing the
dynamic ED behavior when I use "test data 2" below with "^" as the ED delimiter
instead of "*".
The ED lexer rule appears to hard code the choices and the capture action +
semantic predicate seems only to validate rather than provide dynamic token
behavior.
I get the following errors:
line 1:3 no viable alternative at character '^'
...
line 1:4 missing ED at 'HEADER'
...
I'm guessing I didn't implement your suggestion correctly or fully. Ideas?
Jon
// Simple.g
grammar Simple;
tokens {
STA = 'STA';
BEG = 'BEG';
END = 'END';
}
@members {
char sep;
}
transaction : header beg_segment footer;
header : STA ed=ED { sep = $ed.text.toCharArray()[0]; } DATA
ed=ED { $ed.text.toCharArray()[0] == sep }? DATA SD
;
beg_segment : BEG segment_body;
footer : END segment_body;
segment_body : ED DATA ED DATA SD;
DATA : (ALPHA_CAPS | DIGIT | '_')+;
ED : '*';
SD : '\r'? '\n';
fragment DIGIT : '0'..'9';
fragment ALPHA_CAPS : 'A'..'Z';
// test data 2 (fail)
STA^HEADER^SEGMENT
BEG^TRANSACTION^HEADER
END^FOOTER^SEGMENT
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