[antlr-interest] Parse rule to add multiple homogeneous branches under a root node?

[Peter Bosch]

The best answer I got (thanks, David Turvey & Stefan Mätje)

 

Was:

 

public parse

    :  (r+=BRANCH|r+=BRUNCH)* EOF -> ^(ROOT $r*)

    ;

 

I'm off and running into new territory, preparing my next antlr-interest
submission for your viewing pleasure. :-)

 

Regards, all


 

Pete

 

-----Original Message-----
From: antlr-interest-bounces at antlr.org
[mailto:antlr-interest-bounces at antlr.org] On Behalf Of Stephan Opfer
Sent: Thursday, May 10, 2012 9:29 AM
To: antlr-interest at antlr.org
Subject: Re: [antlr-interest] Parse rule to add multiple homogeneous
branches under a root node?

 

My first guess would be

 

public parse :  branches EOF -> ^(ROOT branches);

 

branches: (BRANCH)*;

 

Does that help?

 

Stephan

 

 

 

On 05/08/2012 02:25 PM, Peter Bosch wrote:

> Okay, I've tried to boil it down to a simple test case that 

> illustrates (probably in my parse rule) what I'm doing wrong. Target is
C#.

> 

>  

> 

> //-----------------------------

> 

> // TreeTestInput.txt

> 

> Branch1

> Branch2

> Branch3

> 

>  

> 

> //-----------------------------

> 

> // Desired output:

> 

> ROOT

> 

>    Branch1

> 

>    Branch2

> 

>    Branch3

> 

> //-----------------------------

> 

> // Actual output:

> 

> ROOT

> 

>    Branch3

> 

>  

> 

> //-----------------------------

> 

> // TreeTest.g

> 

> grammar TreeTest;

> 

>  

> 

> options {

> 

>   language=CSharp3;

> 

>   output=AST;

> 

> }

> 

>  

> 

> tokens {

> 

>     ROOT;

> 

> }

> 

>  

> 

> public parse

> 

>     :  ( r=BRANCH )* EOF -> ^(ROOT $r*)

> 

>     ;

> 

>     

> 

> BRANCH

> 

>        :  'Branch' ('0'..'9')

> 

>        ;

> 

>               

> 

> EOL : ('\r'? '\n') {$channel=Hidden;} ;

> 

> WS  : (' '|'\t'|'\f'| EOL)+ {$channel=Hidden;} ;

> 

>  

> 

>  

> 

> Peter Bosch

> Highpoint Software Systems

> E-mail :  < <mailto:pbosch at highpointsoftware.com>
mailto:pbosch at highpointsoftware.com> 

>  <mailto:pbosch at highpointsoftware.com> pbosch at highpointsoftware.com Phone
: 262-893-5400 P-Mail : S42 W27451 

> Oak Grove Lane Waukesha, WI, 53189 Useful and Usable Decision Support 

> & Technical Software

> 

>  

> 

> 

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