#!/usr/bin/perl
+#
+# =====deeper=nesting===>>
+#
+# end of Perl fragment
+# \n@@ \_@@ ;@@ )@@ }@@ \w@@
+# <------------------------------------
+#
+# ------------------------------------>
+# if eval eval+ eval+
+# @@? @@\_ ignore include
+# @@$ @@- file
+# ___ @@\n @@<
+# ,' `
+# | processing processing
+# `---> as TEXT as PERL
+# endif
+# @@; vA <------------------------------------
+# || then
+# comment || ?@@
+# @@# ||
+# || included text fragment as
+# else || string value code to write out
+# @@: || (@@ {@@
+# || <------------------------------------
+# `'
+# ------------------------------------>
+# end of included text fragment
+# @@) @@}
+#
+# <<====deeper=nesting====
+#
+
+# gpt - a generic preprocessing tool
+#
+# This file is
+# Copyright (C) 2001 Ian Jackson <ian@davenant.greenend.org.uk>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
package GenericPrepTemplate;
#BEGIN {
use IO::Handle;
use IO::File;
-open DEBUG, ">&4";
+open DEBUG, ">/dev/null" or die "gpt: /dev/null: $!\n";
-$fh= new IO::Handle;
-$fh->fdopen(fileno(STDIN),'r') or die;
-process_fh($fh,'<standard input>');
+while ($main::ARGV[0] =~ m/^-/) {
+ $_= shift @main::ARGV;
+ next if m/^--$/;
+ while (m/^-./) {
+ if (s/^-d/-/) {
+ open DEBUG, ">&2" or die "gpt: debug to stderr: $!\n";
+ } else {
+ die "gpt: unknown option \`$_'\n";
+ }
+ }
+}
+
+$fn= '<command line>';
+if (!@main::ARGV) {
+ $lno= '<empty>';
+ $fh= new IO::Handle;
+ $fh->fdopen(fileno(STDIN),'r') or err("fdopen stdin: $!");
+ process_fh($fh,'<standard input>');
+ $fh->close or err("close stdin: $!\n");
+} else {
+ for ($i=0; $i<@main::ARGV; $i++) {
+ $lno= '<arg#'.($i+1).'>';
+ process_file($main::ARGV[$i]);
+ }
+}
close STDOUT or die "gpt: close stdout: $!\n";
exit 0;
+sub process_file ($) {
+ my ($value) = @_;
+ $fh= new IO::File $value,'r' or err("cannot open file \`$value': $!");
+ process_fh($fh,$value);
+ $fh->close or err("gpt: cannot close file \`$value': $!");
+}
+
sub err ($) { die "gpt: $fn:$lno: $_[0]\n"; }
sub add_perl ($) {
if (@oplist) { $substr.=$str; }
else { output($str); }
}
-
+
+sub eval_expr () {
+ my ($value);
+ $@='';
+ print DEBUG "E $fn:$lno:e\`$expr'\n";
+ $value= do {
+ package main;
+ eval $GenericPrepTemplate::expr;
+ };
+ if (length $@) {
+ chomp $@; err("error: $@");
+ }
+ print DEBUG "E $fn:$lno:v\`$value'\n";
+ $value;
+}
+
sub process_input () {
- my ($esc,$top,$want,$fh,$value);
+ my ($esc,$top,$want,$fh,$value,$wasyes);
while (length $l) {
- print DEBUG "L $fn:$lno:",join('',@oplist),
- ":`$l' e\`$expr' s\`$substr'\n";
+ print DEBUG "L $fn:${lno}_",join('',@oplist),
+ "_`$l' e\`$expr' s\`$substr'\n";
if (@oplist & 1) { # scanning perl
- if ($l =~ m/(.)\@\@/m || $l =~ m/^()\@\@/m) {
+ if ($l =~ m/^()\@\@/ || $l =~ m/([^\000])\@\@/) {
($to,$op,$esc,$l) = ($`,$1,$&,$');
add_perl($to);
- if ($op =~ m/[ 0-9a-zA-Z_\;\)\}]/ || $op eq '') {
+ if ($op =~ m/[ \t\n0-9a-zA-Z_\;\)\}?]/ || $op eq '') {
$top= pop @oplist;
+ if ($top eq '?') {
+ $op eq '?' or err("expected ?\@\@, got \@\@");
+ } else {
+ $op ne '?' or err("found ?\@\@ not after \@\@?");
+ }
if (!@oplist) {
# And evaluate.
- $expr.= $op;
- $@='';
- print DEBUG "E $fn:$lno:e\`$expr'\n";
- $value= do {
- package main;
- eval $GenericPrepTemplate::expr;
- };
- if (length $@) {
- chomp $@; err("error: $@");
- }
- print DEBUG "E $fn:$lno:v\`$value'\n";
+ $expr.= $op unless $op eq '?';
+ $value= eval_expr();
if ($top eq '<') {
- $fh= new IO::File $value,'r'
- or err("cannot open file \`$value': $!");
- process_fh($fh,$value);
- $fh->close;
+ process_file($value);
+ } elsif ($top eq '?') {
+ push @oplist, '?',':;'.!!$value;
} elsif ($top ne '-') {
output($value);
}
if ($l =~ m/\@\@(.|\n)/) {
($to,$op,$esc,$l) = ($`,$1,$&,$');
add_text($to);
- if ($op =~ m/[-< \$]/) {
- $substr.= $esc if @oplist;
+ if ($op =~ m/[-< \$?\n]/) {
+ if (!@oplist) {
+ add_perl($op) if $op =~ m/[\$]/;
+ } else {
+ $substr.= $esc;
+ }
push @oplist, $op;
- } elsif ($op =~ m/[\)\}]/) {
+ } elsif ($op =~ m/[\)\}\;\:]/) {
err("unmatched closing \@\@$op") unless @oplist;
- my ($want);
- $want= $oplist[$#oplist] eq '(' ? ')' : '}';
- err("found \@\@$op but wanted \@\@$want")
- unless $want eq $op;
- pop @oplist;
+ $want= pop @oplist;
+ if ($want =~ y/({/)}/) {
+ $wasyes=-1;
+ err("found \@\@$op but wanted \@\@$want")
+ unless $want eq $op;
+ } elsif ($want =~ m/^([:;]+)(1?)$/) {
+ ($want,$wasyes)=($1,$2);
+ err("found \@\@$op where not expected (wanted ".
+ join(' or ', map { "\@\@$_" } split //, $want).")")
+ unless $op =~ m/^[$want]$/;
+ '?' eq pop @oplist or die;
+ if ($wasyes) {
+ local ($l) = ($substr);
+ local ($substr,$expr,$to,$op);
+ process_input();
+ };
+ $substr='';
+ $esc='';
+ if ($op eq ':') {
+ push @oplist, '?',';'.!$wasyes;
+ }
+ } else {
+ die "internal /$want/ /$op/";
+ }
if (@oplist==1) {
# Just finished a substr.
$substri++;
} else {
$substr.= $esc;
}
+ } elsif ($op eq '#') {
+ $l =~ s/^[^\n]*//; $l =~ s/^\n//;
} else {
err("bad escape sequence \@\@$op in text part");
}
}
}
+sub close_nesteds () {
+ my ($op);
+ while (@oplist) {
+ $op= $oplist[$#oplist];
+ if (@oplist & 1) {
+ err("unterminated \@\@?") if $op eq '?';
+ $l=' @@';
+ } else {
+ if ($op =~ y/({/)}/) {
+ $l= '@@'.$op;
+ } elsif ($op =~ m/^[;:]+/) {
+ $l= '@@;';
+ } else {
+ die "intern /@oplist/";
+ }
+ }
+ process_input();
+ }
+}
+
sub process_fh ($$) {
local ($fh,$fn) = @_;
local ($l,$lno, @oplist,$substr,$expr,$to,$op);
$lno= $.;
process_input();
}
+
die "gpt: $fn: read error: $!" if $fh->error;
+ close_nesteds();
}
sub output ($) {
local ($outbuf, @oplist,$substr,$expr,$to,$op);
$outbuf='';
process_input();
+ close_nesteds();
return $outbuf;
}
~ian / ian-dotfiles.git / blobdiff