[antlr-interest] Lists. Lexer or Parser?

[Dave Pawson]

2008/9/13 Gavin Lambert <antlr at mirality.co.nz>:
> At 01:58 13/09/2008, Dave Pawson wrote:
>>Obvious next question, how to do it in the Parser please?
>
> Just output whatever you want.  Like so:
>
> list : { Console.writeLine("<list>"); } item* {
> Console.writeLine("</list>"); } ;
> item : TEXT { Console.writeLine("<item>", $TEXT.text, "</item>"); } ;

That's the problem? There is no textual content for the lexer to
trigger on for 'list'?
I can define 'item', but not list?

The input is

blah
blah

*list item 1
* list content 2

etc.

>
>>I'm not that far in the Antlr book - seems like I do need a tree
>>with a non-existant node to hang the list item children from.
>
> Maybe you should read more of the book :)

I will, though it is discouraging that its content is 3.0 based.

>
> And you can do it like that if you want to (eg. if you want to generate an
> AST you can manipulate or generate multiple kinds of output from), but if
> your needs are simple then you might as well just do the output directly in
> the parser.


As I said, this is just me learning by example as I go.

regards



-- 
Dave Pawson
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