[antlr-interest] estimate about creating a parser

[Bill Canfield]

> We would like to create a VHDL parser (with AST).
> 
> Is it possible to create this parser in one month?
> 

Short answer:  no.

As others have indicated, the grammar itself might get done in a month.
But ANTLR ASTs are so generic, that you're likely to want to create a
more VHDL-flavored class library.  That will take some time.

For most applications, an HDL parser is useless without code to
elaborate the design.  That's a non-trivial task.

As a data point, my current project put 6-12 man-months into a
SystemVerilog parser/elaborator in ANTLR/C++.