[antlr-interest] gui to define grammar?

[Bharat Purohit]

Hi,
 
Does anyone know of a tool that you can use to help you define grammar? 
Usually there are examples of the language that you want to capture --
so having a GUI where you can highlight text and say that this is a
keyword (for instance, this would turn into a TOKEN), would be really
useful.
 
Anyone built know of these?
 
 
 
 
Bharat
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