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