commit 524ee82cbbc2ee47072ab0d332627c2442aed33c
Author: spesk <spesk@pm.me>
Date:   Mon Mar 21 10:06:39 2022 -0400

    Completed parser for markup to AST.

diff --git a/pl_proto.pl b/pl_proto.pl
index 60bb6f3..57a1494 100755
--- a/pl_proto.pl
+++ b/pl_proto.pl
@@ -258,6 +258,67 @@ my %PARSE_RULES = (
 	'connect' => sub {
 		my $connect_line = shift;
 		$connect_line = trim($connect_line);
+		if ( $connect_line =~ m/([A-Z]{1}[A-Za-z0-9]{1,})\.([A-Za-z0-9]{1,})\ ([A-Z]{1}[A-Za-z0-9]{1,})\.([A-Za-z0-9]{1,})/ ) {
+			my $output_mod = $1;
+			my $output_mod_port = $2;
+			my $input_mod = $3;
+			my $input_mod_dst = $4;
+
+			# Check we have modules defined
+			if ( ! defined $AST{'Modules'} ) {
+				die "Parse error: Encountered connection but no modules are imported: $connect_line"
+			} else {
+				# Check that connect references imported modules and get module refs
+				my $output_mod_ref;
+				my $input_mod_ref;
+				foreach my $mod_ref ( @{$AST{'Modules'}} ) {
+					if ( $$mod_ref{'Module'} eq $output_mod ) {
+						$output_mod_ref = $mod_ref;
+					} elsif ( $$mod_ref{'Module'} eq $input_mod ) {
+						$input_mod_ref = $mod_ref;
+					}
+				}
+				# If we reach the end of the loop and input/output refs are not set
+				# we didn't find the module, and it's a parse error
+				if ( ! defined $output_mod_ref ||
+				     $output_mod_ref eq "" ||
+				     ! defined $input_mod_ref ||
+				     $input_mod_ref eq "" ) {
+					die "Parse error, couldn't find $output_mod or $input_mod in AST"
+				}
+
+				# Check src/dst ports
+				if ( ! defined $$output_mod_ref{'Outputs'}->{$output_mod_port} ) {
+					die "Parse error: $output_mod_port is not defined in module $output_mod"
+				} elsif ( ! defined $$input_mod_ref{'Inputs'}->{$input_mod_dst} ) {
+					die "Parse error: $input_mod_dst is not defined in module $input_mod"
+				}
+
+				# Everything looks good, make connection
+				my $get_conn_id = sub {
+					if ( ! defined $AST{'Connections'} ) {
+						return 0;
+					} else {
+						my $c = 0;
+						foreach my $conn_id ( @{$AST{'Connections'}} ) {
+							$c++;
+						}
+						return $c;
+					}
+				};
+				my $conn_id = $get_conn_id->();
+				my %conn_map = (
+					'Output_Module' => $output_mod,
+					'Output_Port' => $output_mod_port,
+					'Input_Module' => $input_mod,
+					'Input_Mod_Dst' => $input_mod_dst,
+				);
+				$AST{'Connections'}->{$conn_id} = \%conn_map;
+				
+			}
+		} else {
+			die "Parse error at $connect_line";
+		}
 	},
 	
 );
@@ -287,6 +348,7 @@ sub line_parse($) {
 	}
 }
 
+# MAIN - split the input and parse it
 foreach my $line ( split("\n", $src_content) ) {
 	chomp $line;
 	if ( $line eq "" ) {
@@ -295,5 +357,5 @@ foreach my $line ( split("\n", $src_content) ) {
 	line_parse($line);
 }
 
-
+    # Dump the AST for now. This is where we'd render the output
 print Dumper %AST;