Hello everybody
I'm very new to ANTLR and so far I have been able to achieve what I want.
Before I go a head with the problem, a little background to what I'm trying to
do. I have a number of text based document files, into which I have inserted
expressions into the text to insert dates, names and figures. I'm using ANTLR
to tranform the text file into a populated text file. An typical example of
the expressions would be:
[. insert.date.today/]
The lexer and the parser correctly finds and evaluates any expression that is
on its own. My problem is this, I can have expressions embedded within text.
I want to retain the text and to evaluate the expression. An example of what
I'm using is:
'Your next appointment date is [. insert.date.nextAppointmentDate/] and you
will be seen
by [. insert avaliable.consultant.fullName/]. Please, bring along your [.
insert careerDocumentList/]
to help with you career choice.'
However, what is happening is that expressions embedded in the text are being
ignored and all you get is:
'Your next appointment date is and you will be seen
by . Please, bring along your
to help with you career choice.'
I have successfully got everything working the way I want it, and the Lexer and
tree diagram clearly indentifies the embedded expressions. To cater for the
text I have used the following rule:
everything_else
:(IDENTIFIER | SYMBOLS) (options {greedy=false;} :.*) ;
I believe that the problem is caused by the (options {greedy=false;} :.*). The
wildcard '.*' is accepting all of the text, as text, and ignoring the embedded
expressions.
The lexer rules I have used are:
EXPRESSION_ALPHA: ('a'..'z' | 'A'..'Z' | '.');
NUMBER: ('0'..'9');
LEFT_PAREN: '[.';
RIGHT_PAREN: '\\]'| ']';
WS: (' ' | '\t' | '\u000C' | '\r' | '\n' )* {$channel = HIDDEN;};
IDENTIFIER: (EXPRESSION_ALPHA|NUMBER)+;
Many thanks
Jay
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