855 lines
16 KiB
Perl
855 lines
16 KiB
Perl
#!/usr/local/bin/perl
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use Config;
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use File::Basename qw(&basename &dirname);
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use Cwd;
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# List explicitly here the variables you want Configure to
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# generate. Metaconfig only looks for shell variables, so you
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# have to mention them as if they were shell variables, not
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# %Config entries. Thus you write
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# $startperl
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# to ensure Configure will look for $Config{startperl}.
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# This forces PL files to create target in same directory as PL file.
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# This is so that make depend always knows where to find PL derivatives.
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$origdir = cwd;
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chdir dirname($0);
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$file = basename($0, '.PL');
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$file .= '.com' if $^O eq 'VMS';
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open OUT,">$file" or die "Can't create $file: $!";
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print "Extracting $file (with variable substitutions)\n";
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# In this section, perl variables will be expanded during extraction.
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# You can use $Config{...} to use Configure variables.
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print OUT <<"!GROK!THIS!";
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$Config{startperl}
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eval 'exec $Config{perlpath} -S \$0 \${1+"\$@"}'
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if \$running_under_some_shell;
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\$startperl = "$Config{startperl}";
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\$perlpath = "$Config{perlpath}";
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!GROK!THIS!
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# In the following, perl variables are not expanded during extraction.
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print OUT <<'!NO!SUBS!';
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# $RCSfile: s2p.SH,v $$Revision: 4.1 $$Date: 92/08/07 18:29:23 $
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#
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# $Log: s2p.SH,v $
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=head1 NAME
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s2p - Sed to Perl translator
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=head1 SYNOPSIS
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B<s2p [options] filename>
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=head1 DESCRIPTION
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I<s2p> takes a sed script specified on the command line (or from
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standard input) and produces a comparable I<perl> script on the
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standard output.
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=head2 Options
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Options include:
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=over 5
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=item B<-DE<lt>numberE<gt>>
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sets debugging flags.
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=item B<-n>
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specifies that this sed script was always invoked with a B<sed -n>.
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Otherwise a switch parser is prepended to the front of the script.
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=item B<-p>
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specifies that this sed script was never invoked with a B<sed -n>.
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Otherwise a switch parser is prepended to the front of the script.
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=back
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=head2 Considerations
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The perl script produced looks very sed-ish, and there may very well
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be better ways to express what you want to do in perl. For instance,
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s2p does not make any use of the split operator, but you might want
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to.
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The perl script you end up with may be either faster or slower than
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the original sed script. If you're only interested in speed you'll
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just have to try it both ways. Of course, if you want to do something
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sed doesn't do, you have no choice. It's often possible to speed up
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the perl script by various methods, such as deleting all references to
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$\ and chop.
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=head1 ENVIRONMENT
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s2p uses no environment variables.
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=head1 AUTHOR
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Larry Wall E<lt>F<larry@wall.org>E<gt>
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=head1 FILES
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=head1 SEE ALSO
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perl The perl compiler/interpreter
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a2p awk to perl translator
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=head1 DIAGNOSTICS
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=head1 BUGS
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=cut
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$indent = 4;
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$shiftwidth = 4;
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$l = '{'; $r = '}';
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while ($ARGV[0] =~ /^-/) {
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$_ = shift;
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last if /^--/;
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if (/^-D/) {
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$debug++;
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open(BODY,'>-');
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next;
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}
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if (/^-n/) {
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$assumen++;
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next;
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}
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if (/^-p/) {
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$assumep++;
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next;
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}
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die "I don't recognize this switch: $_\n";
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}
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unless ($debug) {
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open(BODY,"+>/tmp/sperl$$") ||
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&Die("Can't open temp file: $!\n");
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}
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if (!$assumen && !$assumep) {
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print BODY &q(<<'EOT');
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: while ($ARGV[0] =~ /^-/) {
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: $_ = shift;
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: last if /^--/;
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: if (/^-n/) {
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: $nflag++;
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: next;
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: }
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: die "I don't recognize this switch: $_\\n";
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: }
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:
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EOT
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}
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print BODY &q(<<'EOT');
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: #ifdef PRINTIT
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: #ifdef ASSUMEP
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: $printit++;
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: #else
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: $printit++ unless $nflag;
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: #endif
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: #endif
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: <><>
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: $\ = "\n"; # automatically add newline on print
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: <><>
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: #ifdef TOPLABEL
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: LINE:
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: while (chop($_ = <>)) {
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: #else
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: LINE:
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: while (<>) {
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: chop;
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: #endif
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EOT
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LINE:
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while (<>) {
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# Wipe out surrounding whitespace.
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s/[ \t]*(.*)\n$/$1/;
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# Perhaps it's a label/comment.
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if (/^:/) {
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s/^:[ \t]*//;
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$label = &make_label($_);
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if ($. == 1) {
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$toplabel = $label;
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if (/^(top|(re)?start|redo|begin(ning)|again|input)$/i) {
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$_ = <>;
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redo LINE; # Never referenced, so delete it if not a comment.
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}
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}
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$_ = "$label:";
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if ($lastlinewaslabel++) {
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$indent += 4;
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print BODY &tab, ";\n";
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$indent -= 4;
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}
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if ($indent >= 2) {
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$indent -= 2;
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$indmod = 2;
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}
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next;
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} else {
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$lastlinewaslabel = '';
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}
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# Look for one or two address clauses
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$addr1 = '';
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$addr2 = '';
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if (s/^([0-9]+)//) {
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$addr1 = "$1";
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$addr1 = "\$. == $addr1" unless /^,/;
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}
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elsif (s/^\$//) {
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$addr1 = 'eof()';
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}
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elsif (s|^/||) {
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$addr1 = &fetchpat('/');
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}
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if (s/^,//) {
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if (s/^([0-9]+)//) {
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$addr2 = "$1";
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} elsif (s/^\$//) {
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$addr2 = "eof()";
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} elsif (s|^/||) {
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$addr2 = &fetchpat('/');
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} else {
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&Die("Invalid second address at line $.\n");
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}
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if ($addr2 =~ /^\d+$/) {
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$addr1 .= "..$addr2";
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}
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else {
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$addr1 .= "...$addr2";
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}
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}
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# Now we check for metacommands {, }, and ! and worry
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# about indentation.
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s/^[ \t]+//;
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# a { to keep vi happy
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if ($_ eq '}') {
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$indent -= 4;
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next;
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}
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if (s/^!//) {
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$if = 'unless';
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$else = "$r else $l\n";
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} else {
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$if = 'if';
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$else = '';
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}
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if (s/^{//) { # a } to keep vi happy
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$indmod = 4;
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$redo = $_;
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$_ = '';
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$rmaybe = '';
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} else {
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$rmaybe = "\n$r";
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if ($addr2 || $addr1) {
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$space = ' ' x $shiftwidth;
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} else {
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$space = '';
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}
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$_ = &transmogrify();
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}
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# See if we can optimize to modifier form.
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if ($addr1) {
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if ($_ !~ /[\n{}]/ && $rmaybe && !$change &&
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$_ !~ / if / && $_ !~ / unless /) {
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s/;$/ $if $addr1;/;
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$_ = substr($_,$shiftwidth,1000);
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} else {
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$_ = "$if ($addr1) $l\n$change$_$rmaybe";
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}
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$change = '';
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next LINE;
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}
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} continue {
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@lines = split(/\n/,$_);
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for (@lines) {
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unless (s/^ *<<--//) {
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print BODY &tab;
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}
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print BODY $_, "\n";
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}
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$indent += $indmod;
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$indmod = 0;
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if ($redo) {
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$_ = $redo;
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$redo = '';
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redo LINE;
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}
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}
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if ($lastlinewaslabel++) {
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$indent += 4;
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print BODY &tab, ";\n";
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$indent -= 4;
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}
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if ($appendseen || $tseen || !$assumen) {
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$printit++ if $dseen || (!$assumen && !$assumep);
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print BODY &q(<<'EOT');
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: #ifdef SAWNEXT
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: }
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: continue {
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: #endif
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: #ifdef PRINTIT
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: #ifdef DSEEN
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: #ifdef ASSUMEP
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: print if $printit++;
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: #else
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: if ($printit)
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: { print; }
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: else
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: { $printit++ unless $nflag; }
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: #endif
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: #else
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: print if $printit;
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: #endif
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: #else
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: print;
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: #endif
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: #ifdef TSEEN
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: $tflag = 0;
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: #endif
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: #ifdef APPENDSEEN
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: if ($atext) { chop $atext; print $atext; $atext = ''; }
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: #endif
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EOT
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}
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print BODY &q(<<'EOT');
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: }
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EOT
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unless ($debug) {
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print &q(<<"EOT");
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: $startperl
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: eval 'exec $perlpath -S \$0 \${1+"\$@"}'
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: if \$running_under_some_shell;
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:
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EOT
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print"$opens\n" if $opens;
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seek(BODY, 0, 0) || die "Can't rewind temp file: $!\n";
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while (<BODY>) {
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/^[ \t]*$/ && next;
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/^#ifdef (\w+)/ && ((${lc $1} || &skip), next);
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/^#else/ && (&skip, next);
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/^#endif/ && next;
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s/^<><>//;
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print;
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}
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}
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&Cleanup;
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exit;
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sub Cleanup {
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unlink "/tmp/sperl$$";
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}
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sub Die {
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&Cleanup;
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die $_[0];
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}
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sub tab {
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"\t" x ($indent / 8) . ' ' x ($indent % 8);
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}
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sub make_filehandle {
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local($_) = $_[0];
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local($fname) = $_;
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if (!$seen{$fname}) {
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$_ = "FH_" . $_ if /^\d/;
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s/[^a-zA-Z0-9]/_/g;
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s/^_*//;
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$_ = "\U$_";
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if ($fhseen{$_}) {
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for ($tmp = "a"; $fhseen{"$_$tmp"}; $a++) {}
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$_ .= $tmp;
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}
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$fhseen{$_} = 1;
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$opens .= &q(<<"EOT");
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: open($_, '>$fname') || die "Can't create $fname: \$!";
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EOT
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$seen{$fname} = $_;
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}
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$seen{$fname};
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}
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sub make_label {
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local($label) = @_;
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$label =~ s/[^a-zA-Z0-9]/_/g;
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if ($label =~ /^[0-9_]/) { $label = 'L' . $label; }
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$label = substr($label,0,8);
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# Could be a reserved word, so capitalize it.
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substr($label,0,1) =~ y/a-z/A-Z/
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if $label =~ /^[a-z]/;
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$label;
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}
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sub transmogrify {
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{ # case
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if (/^d/) {
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$dseen++;
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chop($_ = &q(<<'EOT'));
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: <<--#ifdef PRINTIT
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: $printit = 0;
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: <<--#endif
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: next LINE;
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EOT
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$sawnext++;
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next;
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}
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if (/^n/) {
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chop($_ = &q(<<'EOT'));
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: <<--#ifdef PRINTIT
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: <<--#ifdef DSEEN
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: <<--#ifdef ASSUMEP
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: print if $printit++;
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: <<--#else
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: if ($printit)
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: { print; }
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: else
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: { $printit++ unless $nflag; }
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: <<--#endif
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: <<--#else
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: print if $printit;
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: <<--#endif
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: <<--#else
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: print;
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: <<--#endif
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: <<--#ifdef APPENDSEEN
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: if ($atext) {chop $atext; print $atext; $atext = '';}
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: <<--#endif
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: $_ = <>;
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: chop;
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: <<--#ifdef TSEEN
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: $tflag = 0;
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: <<--#endif
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EOT
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next;
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}
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if (/^a/) {
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$appendseen++;
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$command = $space . "\$atext .= <<'End_Of_Text';\n<<--";
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$lastline = 0;
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while (<>) {
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s/^[ \t]*//;
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s/^[\\]//;
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unless (s|\\$||) { $lastline = 1;}
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s/^([ \t]*\n)/<><>$1/;
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$command .= $_;
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$command .= '<<--';
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last if $lastline;
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}
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$_ = $command . "End_Of_Text";
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last;
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}
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if (/^[ic]/) {
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if (/^c/) { $change = 1; }
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$addr1 = 1 if $addr1 eq '';
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$addr1 = '$iter = (' . $addr1 . ')';
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$command = $space .
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" if (\$iter == 1) { print <<'End_Of_Text'; }\n<<--";
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$lastline = 0;
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while (<>) {
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s/^[ \t]*//;
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s/^[\\]//;
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unless (s/\\$//) { $lastline = 1;}
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s/'/\\'/g;
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s/^([ \t]*\n)/<><>$1/;
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$command .= $_;
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$command .= '<<--';
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last if $lastline;
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}
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$_ = $command . "End_Of_Text";
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if ($change) {
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$dseen++;
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$change = "$_\n";
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chop($_ = &q(<<"EOT"));
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: <<--#ifdef PRINTIT
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: $space\$printit = 0;
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: <<--#endif
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: ${space}next LINE;
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EOT
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$sawnext++;
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}
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last;
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}
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if (/^s/) {
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$delim = substr($_,1,1);
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$len = length($_);
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$repl = $end = 0;
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$inbracket = 0;
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for ($i = 2; $i < $len; $i++) {
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$c = substr($_,$i,1);
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if ($c eq $delim) {
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if ($inbracket) {
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substr($_, $i, 0) = '\\';
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$i++;
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$len++;
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}
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else {
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if ($repl) {
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$end = $i;
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last;
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} else {
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$repl = $i;
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}
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}
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}
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elsif ($c eq '\\') {
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$i++;
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if ($i >= $len) {
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$_ .= 'n';
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$_ .= <>;
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$len = length($_);
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$_ = substr($_,0,--$len);
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}
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elsif (substr($_,$i,1) =~ /^[n]$/) {
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;
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}
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elsif (!$repl &&
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substr($_,$i,1) =~ /^[(){}\w]$/) {
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$i--;
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$len--;
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substr($_, $i, 1) = '';
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}
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elsif (!$repl &&
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substr($_,$i,1) =~ /^[<>]$/) {
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substr($_,$i,1) = 'b';
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}
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elsif ($repl && substr($_,$i,1) =~ /^\d$/) {
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substr($_,$i-1,1) = '$';
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}
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}
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elsif ($c eq '@') {
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substr($_, $i, 0) = '\\';
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$i++;
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$len++;
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}
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elsif ($c eq '&' && $repl) {
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substr($_, $i, 0) = '$';
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$i++;
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$len++;
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}
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elsif ($c eq '$' && $repl) {
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substr($_, $i, 0) = '\\';
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$i++;
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$len++;
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}
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elsif ($c eq '[' && !$repl) {
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$i++ if substr($_,$i,1) eq '^';
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$i++ if substr($_,$i,1) eq ']';
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$inbracket = 1;
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}
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elsif ($c eq ']') {
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$inbracket = 0;
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}
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elsif ($c eq "\t") {
|
|
substr($_, $i, 1) = '\\t';
|
|
$i++;
|
|
$len++;
|
|
}
|
|
elsif (!$repl && index("()+",$c) >= 0) {
|
|
substr($_, $i, 0) = '\\';
|
|
$i++;
|
|
$len++;
|
|
}
|
|
}
|
|
&Die("Malformed substitution at line $.\n")
|
|
unless $end;
|
|
$pat = substr($_, 0, $repl + 1);
|
|
$repl = substr($_, $repl+1, $end-$repl-1);
|
|
$end = substr($_, $end + 1, 1000);
|
|
&simplify($pat);
|
|
$subst = "$pat$repl$delim";
|
|
$cmd = '';
|
|
while ($end) {
|
|
if ($end =~ s/^g//) {
|
|
$subst .= 'g';
|
|
next;
|
|
}
|
|
if ($end =~ s/^p//) {
|
|
$cmd .= ' && (print)';
|
|
next;
|
|
}
|
|
if ($end =~ s/^w[ \t]*//) {
|
|
$fh = &make_filehandle($end);
|
|
$cmd .= " && (print $fh \$_)";
|
|
$end = '';
|
|
next;
|
|
}
|
|
&Die("Unrecognized substitution command".
|
|
"($end) at line $.\n");
|
|
}
|
|
chop ($_ = &q(<<"EOT"));
|
|
: <<--#ifdef TSEEN
|
|
: $subst && \$tflag++$cmd;
|
|
: <<--#else
|
|
: $subst$cmd;
|
|
: <<--#endif
|
|
EOT
|
|
next;
|
|
}
|
|
|
|
if (/^p/) {
|
|
$_ = 'print;';
|
|
next;
|
|
}
|
|
|
|
if (/^w/) {
|
|
s/^w[ \t]*//;
|
|
$fh = &make_filehandle($_);
|
|
$_ = "print $fh \$_;";
|
|
next;
|
|
}
|
|
|
|
if (/^r/) {
|
|
$appendseen++;
|
|
s/^r[ \t]*//;
|
|
$file = $_;
|
|
$_ = "\$atext .= `cat $file 2>/dev/null`;";
|
|
next;
|
|
}
|
|
|
|
if (/^P/) {
|
|
$_ = 'print $1 if /^(.*)/;';
|
|
next;
|
|
}
|
|
|
|
if (/^D/) {
|
|
chop($_ = &q(<<'EOT'));
|
|
: s/^.*\n?//;
|
|
: redo LINE if $_;
|
|
: next LINE;
|
|
EOT
|
|
$sawnext++;
|
|
next;
|
|
}
|
|
|
|
if (/^N/) {
|
|
chop($_ = &q(<<'EOT'));
|
|
: $_ .= "\n";
|
|
: $len1 = length;
|
|
: $_ .= <>;
|
|
: chop if $len1 < length;
|
|
: <<--#ifdef TSEEN
|
|
: $tflag = 0;
|
|
: <<--#endif
|
|
EOT
|
|
next;
|
|
}
|
|
|
|
if (/^h/) {
|
|
$_ = '$hold = $_;';
|
|
next;
|
|
}
|
|
|
|
if (/^H/) {
|
|
$_ = '$hold .= "\n", $hold .= $_;';
|
|
next;
|
|
}
|
|
|
|
if (/^g/) {
|
|
$_ = '$_ = $hold;';
|
|
next;
|
|
}
|
|
|
|
if (/^G/) {
|
|
$_ = '$_ .= "\n", $_ .= $hold;';
|
|
next;
|
|
}
|
|
|
|
if (/^x/) {
|
|
$_ = '($_, $hold) = ($hold, $_);';
|
|
next;
|
|
}
|
|
|
|
if (/^b$/) {
|
|
$_ = 'next LINE;';
|
|
$sawnext++;
|
|
next;
|
|
}
|
|
|
|
if (/^b/) {
|
|
s/^b[ \t]*//;
|
|
$lab = &make_label($_);
|
|
if ($lab eq $toplabel) {
|
|
$_ = 'redo LINE;';
|
|
} else {
|
|
$_ = "goto $lab;";
|
|
}
|
|
next;
|
|
}
|
|
|
|
if (/^t$/) {
|
|
$_ = 'next LINE if $tflag;';
|
|
$sawnext++;
|
|
$tseen++;
|
|
next;
|
|
}
|
|
|
|
if (/^t/) {
|
|
s/^t[ \t]*//;
|
|
$lab = &make_label($_);
|
|
$_ = q/if ($tflag) {$tflag = 0; /;
|
|
if ($lab eq $toplabel) {
|
|
$_ .= 'redo LINE;}';
|
|
} else {
|
|
$_ .= "goto $lab;}";
|
|
}
|
|
$tseen++;
|
|
next;
|
|
}
|
|
|
|
if (/^y/) {
|
|
s/abcdefghijklmnopqrstuvwxyz/a-z/g;
|
|
s/ABCDEFGHIJKLMNOPQRSTUVWXYZ/A-Z/g;
|
|
s/abcdef/a-f/g;
|
|
s/ABCDEF/A-F/g;
|
|
s/0123456789/0-9/g;
|
|
s/01234567/0-7/g;
|
|
$_ .= ';';
|
|
}
|
|
|
|
if (/^=/) {
|
|
$_ = 'print $.;';
|
|
next;
|
|
}
|
|
|
|
if (/^q/) {
|
|
chop($_ = &q(<<'EOT'));
|
|
: close(ARGV);
|
|
: @ARGV = ();
|
|
: next LINE;
|
|
EOT
|
|
$sawnext++;
|
|
next;
|
|
}
|
|
} continue {
|
|
if ($space) {
|
|
s/^/$space/;
|
|
s/(\n)(.)/$1$space$2/g;
|
|
}
|
|
last;
|
|
}
|
|
$_;
|
|
}
|
|
|
|
sub fetchpat {
|
|
local($outer) = @_;
|
|
local($addr) = $outer;
|
|
local($inbracket);
|
|
local($prefix,$delim,$ch);
|
|
|
|
# Process pattern one potential delimiter at a time.
|
|
|
|
DELIM: while (s#^([^\]+(|)[\\/]*)([]+(|)[\\/])##) {
|
|
$prefix = $1;
|
|
$delim = $2;
|
|
if ($delim eq '\\') {
|
|
s/(.)//;
|
|
$ch = $1;
|
|
$delim = '' if $ch =~ /^[(){}A-Za-mo-z]$/;
|
|
$ch = 'b' if $ch =~ /^[<>]$/;
|
|
$delim .= $ch;
|
|
}
|
|
elsif ($delim eq '[') {
|
|
$inbracket = 1;
|
|
s/^\^// && ($delim .= '^');
|
|
s/^]// && ($delim .= ']');
|
|
}
|
|
elsif ($delim eq ']') {
|
|
$inbracket = 0;
|
|
}
|
|
elsif ($inbracket || $delim ne $outer) {
|
|
$delim = '\\' . $delim;
|
|
}
|
|
$addr .= $prefix;
|
|
$addr .= $delim;
|
|
if ($delim eq $outer && !$inbracket) {
|
|
last DELIM;
|
|
}
|
|
}
|
|
$addr =~ s/\t/\\t/g;
|
|
$addr =~ s/\@/\\@/g;
|
|
&simplify($addr);
|
|
$addr;
|
|
}
|
|
|
|
sub q {
|
|
local($string) = @_;
|
|
local($*) = 1;
|
|
$string =~ s/^:\t?//g;
|
|
$string;
|
|
}
|
|
|
|
sub simplify {
|
|
$_[0] =~ s/_a-za-z0-9/\\w/ig;
|
|
$_[0] =~ s/a-z_a-z0-9/\\w/ig;
|
|
$_[0] =~ s/a-za-z_0-9/\\w/ig;
|
|
$_[0] =~ s/a-za-z0-9_/\\w/ig;
|
|
$_[0] =~ s/_0-9a-za-z/\\w/ig;
|
|
$_[0] =~ s/0-9_a-za-z/\\w/ig;
|
|
$_[0] =~ s/0-9a-z_a-z/\\w/ig;
|
|
$_[0] =~ s/0-9a-za-z_/\\w/ig;
|
|
$_[0] =~ s/\[\\w\]/\\w/g;
|
|
$_[0] =~ s/\[^\\w\]/\\W/g;
|
|
$_[0] =~ s/\[0-9\]/\\d/g;
|
|
$_[0] =~ s/\[^0-9\]/\\D/g;
|
|
$_[0] =~ s/\\d\\d\*/\\d+/g;
|
|
$_[0] =~ s/\\D\\D\*/\\D+/g;
|
|
$_[0] =~ s/\\w\\w\*/\\w+/g;
|
|
$_[0] =~ s/\\t\\t\*/\\t+/g;
|
|
$_[0] =~ s/(\[.[^]]*\])\1\*/$1+/g;
|
|
$_[0] =~ s/([\w\s!@#%^&-=,:;'"])\1\*/$1+/g;
|
|
}
|
|
|
|
sub skip {
|
|
local($level) = 0;
|
|
|
|
while(<BODY>) {
|
|
/^#ifdef/ && $level++;
|
|
/^#else/ && !$level && return;
|
|
/^#endif/ && !$level-- && return;
|
|
}
|
|
|
|
die "Unterminated `#ifdef' conditional\n";
|
|
}
|
|
!NO!SUBS!
|
|
|
|
close OUT or die "Can't close $file: $!";
|
|
chmod 0755, $file or die "Can't reset permissions for $file: $!\n";
|
|
exec("$Config{'eunicefix'} $file") if $Config{'eunicefix'} ne ':';
|
|
chdir $origdir;
|