Hi All,
I hope I can get a little help on the grammar I have below.
It works to a degree but I'm having trouble with some edge cases and that is
stressing me a little.
When I write something like the following I get the right response - sequence
of tokens.
Im putting '\n' where I would have new lines.
\n
+ foo\n
\n
What I can't seem to do is put in a rule that matches a line that doesn't start
with '+' or '-'
I get a no viable Alt Exception with all that I try.
My goal is to be able to detect lines starting with a '+' or a '-' followed by
a messagePattern.
And lines NOT starting with a '+' or a '-'. The grammar below does not contain
any rules
for this, because I can't get them to work.
Please help
Rgs, James.
grammar Preprocessor;
options {
language = Java;
}
@header {
package compiler;
}
@lexer::header {
package compiler;
}
lines
: (lineBreak | messagePattern)* EOF
;
messagePattern
: ('+' | '-') (unarySelector | keywordSelector | binarySelector)
;
unarySelector
: NAME
;
keywordSelector
: (KEYWORD NAME)+
;
binarySelector
: BINARY_SYMBOL NAME
;
lineBreak
: LINE_BREAK ;
LINE_BREAK: ('\r'? '\n' | '\r');
NAME: ('a'..'z' | 'A'..'Z')('a'..'z' | 'A'..'Z' | '0'..'9')*;
KEYWORD: NAME':';
BINARY_SYMBOL:
('~'|'!'|'@'|'%'|'&'|'*'|'-'|'+'|'='|'\\'|'|'|'?'|'/'|'>'|'<'|',')
('~'|'!'|'@'|'%'|'&'|'*'|'-'|'+'|'='|'\\'|'|'|'?'|'/'|'>'|'<'|',')*;
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