Hardware::Vhdl::Lexer 1.00

Hardware::Vhdl::Lexer is a Perl module that can split VHDL code into lexical tokens.

SYNOPSIS

use Hardware::Vhdl::Lexer;

# Open the file to get the VHDL code from
my $fh;
open $fh, <, device_behav.vhd || die $!

# Create the Lexer object
my $lexer = Hardware::Vhdl::Lexer->new({ linesource => $fh });

# Dump all the tokens
my ($token, $type);
while( (($token, $type) = $lexer->get_next_token) && defined $token) {
print "# type = $type token=$tokenn";
}

Hardware::Vhdl::Lexer splits VHDL code into lexical tokens. To use it, you need to first create a lexer object, passing in something which will supply chunks of VHDL code to the lexer. Repeated calls to the get_next_token method of the lexer will then return VHDL tokens (in scalar context) or a token type code and the token (in list context). get_next_token returns undef when there are no more tokens to be read.

NB: in this documentation I refer to "lines" of VHDL code and "line" sources etc., but in fact the chunks of code dont have to be broken up at line-ends - they can be broken anywhere that isnt in the middle of a token. New-line characters just happen to be a simple and safe way to split up a file. You dont even have to split up the VHDL at all, you can pass in the whole thing as the first and only "line".