[antlr-interest] Parsing expressions inside a double quoted string?

[Andrew Deren]

I had similar problem a while ago. I was doing lexer/parser for cold fusion
which has expressions inside of # ("Hello #foo# #2+2#")
What I did was to use predicates. It would be easier to do with rule based
parser generator.
Just have a variable that holds current lexer "mode". 
Default mode, InString and expressionInString. Initially I wanted to use 2
lexers/parsers, but couldn't find enough docs on that. My current solution
works as expected, but I don't like it.
Andrew

-----Original Message-----
From: Rodrigo B. de Oliveira [mailto:rodrigobamboo at hotmail.com] 
Sent: Friday, July 11, 2003 12:26 PM
To: antlr-interest at yahoogroups.com

Oh, I see.

I didn't think it was possible... I've just went through all the docs and
it's clear how it works now, thanks.

I still haven't been able to figure it all out. For a start I want the
lexers to transform this:

"Hello ${foo}, ${2 + 2}"

into this:

"Hello" + (foo) + ", " + (2 + 2)

I'll give it some thought again later tonite.

Thanks again,
Rodrigo

----- Original Message ----- 
From: "Pete Forman" <pete.forman at westerngeco.com>
To: <antlr-interest at yahoogroups.com>; <antlr-interest at yahoogroups.com>
Sent: Wednesday, July 09, 2003 11:19 AM
Subject: Re: [antlr-interest] Parsing expressions inside a double quoted
string?


> At 2003-07-09 07:43 -0300, Rodrigo Oliveira wrote:
> >You mean by using a filter?
>
> Not a filter but a second lexer.  The main lexer should switch to the
> second when it finds the opening double quote.  One example is in the Java
> parser for javadoc comments IIRC.
>
> -- 
> Pete Forman                -./\.-  Disclaimer: This post is originated
> WesternGeco                  -./\.-   by myself and does not represent
> pete.forman at westerngeco.com    -./\.-   opinion of Schlumberger, Baker
> http://petef.port5.com           -./\.-   Hughes or their divisions.
>
>
>
>
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>
>

 

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