my $state = "HTM";
The state is what I don't like. It means that everything needs to be done manually. So to get the line numbers, I'd probably just extend the regex with one set of all-enclosing parens (or for simple stand-alone scripts just use $&), and then count the number of \n characters found in it.
my @parsed;
my $line = 1;
while ($asp =~ /\G( ((?: [^<]+ | <(?!%) )*) (?: <%(.*?)%> | ((?=<%)) )
+? )/gsx) {
$2 and push @parsed, [ $line, html => $2 ];
$3 and push @parsed, [ $line, asp => $3 ];
defined $4 and die "Unclosed ASP code block starting on line $line
+ near '",
$asp =~ /\G(<%\s*\n?.*)/g, "'.\n";
$line += $1 =~ tr/\n//;
}
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