a2d/res/asmfmt.pl
2018-03-05 08:41:22 -08:00

100 lines
2.2 KiB
Perl
Executable File

#!/usr/bin/env perl
use strict;
use warnings;
sub nospace($) {
my ($s) = @_;
$s =~ s/ //g;
return $s;
}
my $tab = 8;
my $comment_column = 32;
# TODO: untabify input
# TODO: sigils to disable/enable formatting around blocks
while (<STDIN>) {
chomp;
my $orig = $_;
$_ =~ s/^\s+|\s+$//g;
if (m/^$/) {
# empty line - ignore
} elsif (m/^(;;;.*)/) {
# full line comment - flush left
$_ = $1;
} elsif (m/^(;;.*)/) {
# indented comment - one tab stop
$_ = (' ' x $tab) . $1;
} else {
my $comment = '';
if (m/^(.*?)(;.*)$/) {
$_ = $1;
$comment = $2;
}
if (m/^(\w+)\s*:=\s*(.*)$/) {
# equate - flush left (!!), spaced out
my ($identifier, $expression) = ($1 // '', $2 // '', $3 // '');
$_ = '';
$_ .= $identifier . ' ';
$_ .= ' ' while length($_) % $tab;
$_ .= ':= ' . $expression . ' ';
} elsif (m/^(\.(?:end)?(?:proc|scope|macro)\b)\s*(.*)$/) {
# scope - flush left
my ($opcode, $arguments) = ($1 // '', $2 // '');
$_ = $opcode . ' ' . $arguments;
} elsif (m/^(\.(?:if\w*|elseif|else|endif)\b)\s*(.*)$/) {
# conditional - half indent left
my ($opcode, $arguments) = ($1 // '', $2 // '');
$_ = ' ' x ($tab/2);
$_ .= $opcode . ' ' . $arguments;
} elsif (m/^(\w*:)?\s*(\S+)?\s*(.*?)\s*(;.*)?$/) {
# label / opcode / arguments / comment
my ($label, $opcode, $arguments, $comment) = ($1 // '', $2 // '', $3 // '', $4 // '');
$_ = '';
$_ .= $label . ' ';
$_ .= ' ' while length($_) % $tab;
$_ .= $opcode . ' ';
if ($opcode =~ m/^([a-z]{3}\w*)$|^(\.(byte|word|addr|res))$/) {
$_ .= ' ' while length($_) % $tab;
}
$_ .= $arguments . ' ';
} else {
die "Unexpected line: $_\n";
}
if ($comment ) {
$_ .= ' ' while length($_) < $comment_column;
$_ .= $comment;
}
}
$_ =~ s/\s+$//; # trim right
die unless nospace($_) eq nospace($orig);
print $_, "\n";
}