I am still confused.
Everything I try seems to break something else.
I have a grammar and a tree grammar.
When I print out the tree I see the whitespace that is embedded in my
string.
I can't figure out what I have to do either in the tree construction, or
the tree walker to get to the hidden token channel.
Here is a snippet of the grammar that produces the tree grammar:
mdx_statement
:
'MDX(' mdxs=mdx_stmt ')' -> ^(MDX_FUNC $mdxs)
;
mdx_stmt
: dqcon -> dqcon;
dqcon
: '"'
( (~'"')=>
( ('\\')=>'\\'.
| .
)
)*
'"';
WS : (' '|'\t'|'\n'|'\r')+ {$channel=HIDDEN;} ;
When I parse something like:
MDX("a g g g g g g gggggggggggggggggggggggggx")
And then print the tree I see this:
(MDX_FUNC " a g g g g g g gggggggggggggggggggggggggx ")
In my tree grammar I have this (I left out some things, but you get the
idea):
@after {
statements.Add($select_statement::stmt);
if ($mdxs.text != null) {
$select_statement::stmt.TheMDX = $mdxs.text;
}
}
^(MDX_FUNC mdxs=mdx_stmt)
;
mdx
: dqcon
;
I get an empty string. I know there is something I a missing. In the
debugger I see the input text. Is there a simple way I can get the
string representation of the node?
Thanks,
Mark
-----Original Message-----
From: John B. Brodie [mailto:j...@acm.org]
Sent: Thursday, July 02, 2009 11:54 AM
To: Penningroth, Mark
Cc: antlr-inter...@antlr.org
Subject: Re: [antlr-interest] Question about preserving spaces in quoted
strings
Greetings!
On Thu, 2009-07-02 at 10:35 -0400, Penningroth, Mark wrote:
> I have the following in my grammar:
>
> sqcon
> : '\'' ( options {greedy=false;} : .)* '\''
> ;
>
> The intent is to get a single text node with everything between the
> sing quotes.
>
> When I parse 'Los Angeles' I lose the space .
your sqcon rule is a Parser rule (because it begins with a lower case
letter).
have you tried making it a Lexer rule? by up-casing (at least) the first
letter.
and note that when you make it into a Lexer rule, the text of the token
will include the leading and trailing quotes, so you may need to
substring them away.
Hope this helps
-jbb
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