[antlr-interest] "Ignore until" in the Parser

[Greg Bedwell]

Hi,

I've scoured the documentation for an answer to this but I find it
quite hard to work out where a potential answer may lie.

I'm using ANTLR to strip some information from the headers of verilog
modules (inputs, outputs, associated widths, parameters, etc) which
ALMOST works fine, except for one tiny little problem.

I'm only interested in parsing the first few lines of each module.  I
don't care at all about the contents of the body of the module at all
really.  Currently it works perfectly if I manually delete the
contents of the body from the verilog module but that is not a
feasable solution once this program leaves my hands :).

I need a way to define a rule in the parser that says: skip everything
until the word "endmodule" appears.  Here's an example of the code I
am parsing.  There will be potentially hundreds of modules in each
file I parse:

module myModule (out, in1, sel);

parameter size1 = 8;
parameter size2 = 4;

output [size1-1:0] out;
input [size1*size2-1:0] in1;
input [size2-1:0] sel;

// Everything from here I want to ignore

reg [size1-1:0] out;
integer i,j,temp;

always @ (in1 or sel)
begin
    // Lots of verilog code.
end

// Ignore until here

endmodule


I want to stay away from having to use an entire verilog grammar if
possible because it seems a massive overkill and will complicate my
solution which at the moment is relatively few lines long :)

Thanks