From: "Kevin J. Cummings" <[email protected]>
> On 09/23/2010 09:50 AM, Daniel Lidström wrote:
>> How do I "capture" the dash and colon? Here's my grammar:
>
> If the "-" and ":" are a part of your format string, then they are not a
> part of your input, are they? I would think that outputting them would
> be a function of how you handle your format string (which you included
> above). It looks like you are outputting just the "variable" part of
> your format string and not the "constant" part....
>
> When you parse your format string, you will need to save the constant
> parts verbatim.
>
> Perhaps you can use the "dot notation" (of the lexer) to save anything
> that isn't one of your tokens listed below, and output them verbatim.
> So, you need another token type to catch "anything else".
Thanks for the suggestion. I have taken a step back and my grammar now looks
like this:
program
: statement*
;
statement
: TEXT
| variable
;
variable
: '[' LETTERS ']'
;
fragment LETTER : 'a'..'z' | 'A'..'Z' ;
LETTERS : LETTER+ ;
TEXT : ~('[' | ']')+ ;
Using Antlr IDE within Eclipse I can see that this parses something like
"set status [yyyy]-[M]-[d] [H]:[m]"
correctly (all [...] are treated like variables, the rest are statements).
My TEXT lexer seems to be working fine. If I try to use the dot, I get an
error:
TEXT : .+ ;
error(201): /TemplateCommand/src/com/gpsgate/TemplateCommand.g:31:8: The
following alternatives can never be matched: 1
|---> TEXT : .+ ;
Is there a way to use dot or should I just be fine with the TEXT lexer as
is?
Daniel
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