[antlr-interest] Howto #include other files while parsing?

[John Woods]

Thanks! Exactly what I was looking for.

-----Original Message-----
From: siemsen at ucar.edu
Sent: 04/15/2008 10:16 PM
> I have a grammar that does this, using the method described on the ANTLR 
> Wiki at
> 
>     http://www.antlr.org/wiki/pages/viewpage.action?pageId=557057
> 
> -- Pete
> 
> 
> On Apr 15, 2008, at 9:46 PM, Peter Nann wrote:
> 
>>
>> Well, I was about to tackle that problem any day now, so look forward to
>> your solution!
>> (Or, surely there is a standard solution to this...)
>>
>> Are you writing it in Java?
>> Any chance you could flick your code to me once it's working?
>> ;-) I'd owe you one...
>>
>> -----Original Message-----
>> From: antlr-interest-bounces at antlr.org
>> [mailto:antlr-interest-bounces at antlr.org] On Behalf Of John Woods
>> Sent: Wednesday, 16 April 2008 1:20 PM
>> To: antlr-interest at antlr.org
>> Subject: [antlr-interest] Howto #include other files while parsing?
>>
>> I'm creating a parser for a file format which has a #include statement
>> much like the C preprocessor. The solution I'm thinking of would involve
>> creating an InputStream subclass that reads from one file, then when the
>> parser parses a #include statement, the parser tells the InputStream to
>> switch to reading the #included file, and when that file is exhausted,
>> the InputStream pops back to the previous file, continuing reading where
>> it left off -- immediately after the #include statement.
>>
>> Is there any guarantee that the lexer won't read past the #include
>> statement when it is parsed? Because if it did read ahead, then the
>> #included file would essentially be "inserted" at the wrong position in
>> the InputStream.
>>
>> Is there a better way to approach this problem?
>>
>> Thanks.
> 
>