/usr/bin/sgmldiff is in docbook-utils 0.6.14-3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# Structurally diffs two SGML/XML files.
# Copyright (C) 2000 Frederik Fouvry
#
# 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 of the License, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# Send bug reports, comments, suggestions, improvements etc. to
# Frederik Fouvry <fouvry@sfs.nphil.uni-tuebingen.de>.
use strict;
use integer;
use vars qw($nsgmls $errors $errorlog $VERSION);
use Getopt::Long 2.01;
$VERSION = 1.03;
my $nsgmls;
$nsgmls = "/usr/bin/nsgmls";
#----------------------------------------------------------------------
# TODO:
# - add text occurrences to diff file, such that diff has a bit more
# context; it might help in some cases (and perhaps ruin it in others).
# - Wait for suggestions ;-)
#
# Note: the input file need not be valid, nor is it necessary to have
# the DTDs. nsgmls always returns a structure.
#----------------------------------------------------------------------
# Get file name
chomp(my $progname = `basename $0`);
my ($opt_a, $opt_s, $opt_h, $opt_v, $opt_c) = (0, 0, 0, 0, "");
&GetOptions("h|help" => \$opt_h,
"v|version" => \$opt_v,
"s|statistics!" => \$opt_s,
"a|attributes!" => \$opt_a,
"c|context=s" => \$opt_c);
# -a includes the attribute values in the diff
# -s prints external entity information at the end
# -h prints help
# -v prints version
# -c add some context to improve the diff results
if ($opt_v == 1) {
print STDOUT "DocBook-utils version 0.6.14 (sgmldiff v$VERSION)\n";
exit 0;
};
# Check number of arguments
if ($opt_h == 1 || @ARGV != 2) {
print STDERR "DocBook-utils version 0.6.14 (sgmldiff v$VERSION)
Usage: $progname [options] file1 file2
where the options are:
-a, --attributes includes the attribute values in the diff
-s, --statistics prints some SGML information at the end
-h, --help prints this usage information
-v, --version prints the version on the standard output
-c, --context adds more context to the diff, which may
improve the results. It takes \"attributes\", \"textpos\"
or \"nesting\" as an argument e.g. -c textpos, which can
also be combined: -c nesting,attributes
";
exit 0;
};
$opt_a = 1 if $opt_c =~ /attributes/; # -c attributes = -a
# Initialise
my $file1 = $ARGV[0];
my $diff1 = "$file1.difftmp$$";
my $file2 = $ARGV[1];
my $diff2 = "$file2.difftmp$$";
$errors = "-E0 -e -g"; # allow any number of errors
# and show precise context position of error
$errorlog = "-f /dev/null";
my $indent = "";
# Get structure of the files
my ($lines1,@allfile1) = &prepare($file1, $diff1);
my ($lines2,@allfile2) = &prepare($file2, $diff2);
my @lines1 = split(/@/,$lines1);
my @lines2 = split(/@/,$lines2);
# Do diff and rebuild the original input
open(SDIFF,"diff $diff1 $diff2 |");
$_ = <SDIFF>;
while (defined($_)) {
chomp $_;
my ($start1, $start2, $command, $d1, $d2, $end1, $end2);
# New difference
if ($_ =~ /^(\d+)(,(\d+))?([acd])(\d+)(,(\d+))?$/) {
$start1 = $1-1;
$command = $4;
$start2 = $5-1;
if (defined $3) { $d1 = $3-$1; } else { $d1 = 0; };
if (defined $7) { $d2 = $7-$5; } else { $d2 = 0; };
};
$end1 = $start1+$d1;
$end2 = $start2+$d2;
print "$lines1[$start1]"
.($lines1[$end1] > $lines1[$start1] ? ",$lines1[$end1]" : "")
."$command$lines2[$start2]"
.($lines2[$end2] > $lines2[$start2] ? ",$lines2[$end2]" : "")
."\n";
# Print lines of first file
$_ = <SDIFF>;
while (defined $_ && /^< /) {
print &normalise_text($allfile1[$start1++],"< ");
$_ = <SDIFF>;
};
undef $start1;
print "---\n";
# Print lines of second file
$_ = <SDIFF> if defined($_) && $_ =~ /^---$/;
while (defined $_ && /^> /) {
print &normalise_text($allfile2[$start2++],"> ");
$_ = <SDIFF>;
};
undef $start2;
};
close(SDIFF);
# Clean up
unlink $diff1;
unlink $diff2;
#---------------------------------------------------------------------
# Process nsgmls output: keep all stuff that is important for the
# structure comparison. Make two structures: one that is diffed
# (without text) (DIFF) and one that is used to present the
# differences to the user (@full). For more info: see SP
# documentation, nsgmls output format.
sub prepare {
my($filename,$todiffname) = @_;
my @full = ();
my @attributes;
my @e_attributes;
my ($system_identifier, $public_identifier, $f_info, $empty) = ("", "", "");
my %statistics = (notation => {},
text => {},
external_data => {},
subdocument => {},
files => {});
my @line_numbered = ();
my $line = 0;
open(ESIS, "$nsgmls -l $errors $errorlog -onotation-sysid -oid -oempty $filename | "); #-oentity generates strange output; ? -ononsgml
open(DIFF, "> $todiffname");
while (<ESIS>) {
chomp $_;
if ($_ =~ /^\((.+)$/) {
print DIFF "$indent<$1";
print DIFF " ".join(" ",@attributes)
if (@attributes > 0 && defined($opt_a) && $opt_a == 1);
print DIFF ">\n";
push @line_numbered, "$line";
push @full, "$indent<$1".(@attributes > 0 ? " ".join(" ",@attributes) : "").">\n";
@attributes = ();
$indent .= " " if $opt_c =~ /nesting/;
} elsif ($_ =~ /^\)(.+)$/) {
my $gi = $1;
$indent = substr($indent,0,-1) if $opt_c =~ /nesting/;
push @line_numbered, "$line" unless $empty;
push @full, "$indent</$gi>\n" unless $empty;
print DIFF "$indent</$gi>\n" unless $empty;
$empty = 0;
} elsif ($_ =~ /^-(.*)$/) {
my $data = $1;
my @a = split(/\\n/, $data);
push @line_numbered, "$line";
push @full, "$data\n";
$line += $#a;
print DIFF ($opt_c =~ /textpos/ ? "-" : "")."\n";
} elsif ($_ =~ /^\&(.*)$/) {
print DIFF "&$1;";
push @line_numbered, "$line";
push @full, "&$1;";
} elsif ($_ =~ /^\?(.*)$/) {
print DIFF "<?$1>\n";
push @line_numbered, "$line";
push @full, "<?$1>\n";
} elsif ($_ =~ /^A(\S+)\s+(IMPLIED|CDATA (.*)|NOTATION (.*)|ENTITY (.*)|TOKEN (.*)|ID (.*))$/) {
my $attr = $1;
my $val = $2;
if ($val eq "IMPLIED") {
# don't print anything
} elsif ($val =~ /^CDATA (.*)$/) {
@attributes = (@attributes, "$attr=\"$1\"");
} elsif ($val =~ /^NOTATION (.*)$/) {
@attributes = (@attributes, "$attr=\"$1\"");
} elsif ($val =~ /^ENTITY (.*)$/) {
@attributes = (@attributes, "$attr=\"$1\"");
} elsif ($val =~ /^TOKEN (.*)$/) {
@attributes = (@attributes, "$attr=\"$1\"");
} elsif ($val =~ /^ID (.*)$/) {
@attributes = (@attributes, "$attr=\"$1\"");
} else {
warn "Unrecognised construction `$val'";
};
} elsif ($_ =~ /^D(\S+)\s+(IMPLIED|CDATA (.*)|NOTATION (.*)|ENTITY (.*)|TOKEN (.*)|ID (.*))$/) {
# as yet never printed out
if ($opt_a == 1) {
my $attr = $1;
my $val = $2;
if ($val eq "IMPLIED") {
# don't print anything
} elsif ($val =~ /^CDATA (.*)$/) {
@e_attributes = (@e_attributes, "$attr=\"$1\"");
} elsif ($val =~ /^NOTATION (.*)$/) {
@e_attributes = (@e_attributes, "$attr=\"$1\"");
} elsif ($val =~ /^ENTITY (.*)$/) {
@e_attributes = (@e_attributes, "$attr=\"$1\"");
} elsif ($val =~ /^TOKEN (.*)$/) {
@e_attributes = (@e_attributes, "$attr=\"$1\"");
} elsif ($val =~ /^ID (.*)$/) {
@e_attributes = (@e_attributes, "$attr=\"$1\"");
} else {
warn "Unrecognised construction `$val'";
};
} else { };
} elsif ($_ =~ /^a(\S+)\s+(\S+)\s+(.*)$/) {
my_warn($_);
} elsif ($_ =~ /^N(.*)$/) {
$statistics{notation}->{$1}->{pubid} = "$public_identifier"
unless $public_identifier eq "";
$statistics{notation}->{$1}->{sysid} = "$system_identifier"
unless $system_identifier eq "";
$statistics{notation}->{$1}->{emsysid} = "$f_info"
unless $f_info eq "";
$system_identifier = "";
$public_identifier = "";
$f_info = "";
} elsif ($_ =~ /^E(\S+)\s+(CDATA|NDATA|SDATA)\s+(.*)$/) {
$statistics{external_data}->{$1}->{pubid} = "$public_identifier $2 $3"
unless $public_identifier eq "";
$statistics{external_data}->{$1}->{sysid} = "$system_identifier $2 $3"
unless $system_identifier eq "";
$statistics{external_data}->{$1}->{emsysid} = "$f_info"
unless $f_info eq "";
$system_identifier = "";
$public_identifier = "";
$f_info = "";
} elsif ($_ =~ /^I(\S+)\s+(CDATA|SDATA|PI|TEXT)\s+(.*)$/) {
my $typ = $2;
my $name = $1;
my $val = $3;
if ($typ =~ /^CDATA$/) {
push @full, "$val";
push @line_numbered, "$line";
print DIFF "$val";
} elsif ($typ =~ /^SDATA$/) {
my_warn($typ);
} elsif ($typ =~ /^PI$/) {
my_warn($typ);
} elsif ($typ =~ /^TEXT$/) {
my_warn($typ);
} else {
my_warn($typ);
};
} elsif ($_ =~ /^S(.*)$/) {
$statistics{subdocument}->{$1}->{pubid} = "$public_identifier"
unless $public_identifier eq "";
$statistics{subdocument}->{$1}->{sysid} = "$system_identifier"
unless $system_identifier eq "";
$statistics{subdocument}->{$1}->{emsysid} = "$f_info"
unless $f_info eq "";
$system_identifier = "";
$public_identifier = "";
$f_info = "";
} elsif ($_ =~ /^T(.*)$/) {
$statistics{text}->{$1}->{pubid} = "$public_identifier"
unless $public_identifier eq "";
$statistics{text}->{$1}->{sysid} = "$system_identifier"
unless $system_identifier eq "";
$statistics{text}->{$1}->{emsysid} = "$f_info"
unless $f_info eq "";
$system_identifier = "";
$public_identifier = "";
$f_info = "";
} elsif ($_ =~ /^s(.*)$/) {
$system_identifier = "$1";
} elsif ($_ =~ /^p(.*)$/) {
$public_identifier = "$1";
} elsif ($_ =~ /^f(.*)$/) {
$f_info = "$1";
} elsif ($_ =~ /^{(.*)$/) {
my_warn($_);
} elsif ($_ =~ /^}(.*)$/) {
my_warn($_);
} elsif ($_ =~ /^L((\d+)( (.+))?)$/) {
$line = $2;
# only line is set; nothing else is done
# print DIFF "----------$4----------\n" if defined($4);
# push @full, (defined($4) ? "----------$4----------\n" : "")."L$line\n";
# push @line_numbered, "$line";
$statistics{files}->{$4} = 1 if defined $4;
} elsif ($_ =~ /^#(.*)$/) {
my_warn($_);
} elsif ($_ =~ /^C$/) {
print STDERR "====================\n";
print STDERR "The file `$filename' is a valid document.\n";
} elsif ($_ =~ /^i$/) {
# don't do anything
# only output with the option -oincluded
# for elements that are allowed by inclusion exception
} elsif ($_ =~ /^e$/) {
$empty = 1;
# only output with the option -oempty
} else {
warn "Unrecognised construction `$_'";
};
};
close(DIFF);
close(ESIS);
if (defined $opt_s && $opt_s == 1) {
print STDERR "--------------------\n";
print STDERR "Used SGML text files:\n"
unless keys(%{$statistics{files}}) == 0;
foreach my $f (keys %{$statistics{files}}) {
print STDERR " $f\n";
};
delete $statistics{files};
my $stat_text = "";
foreach my $k (keys %statistics) {
my $stat_text1;
if ($k eq "external_data") { $stat_text1 .= "<!ENTITY"; }
elsif ($k eq "notation") { $stat_text1 .= "<!NOTATION"; }
elsif ($k eq "subdocument") { $stat_text1 .= "<!SUBDOC"; }
elsif ($k eq "text") { $stat_text1 .= "Entity"; }
else { die "Wrong statistics value"};
foreach my $l (keys %{$statistics{$k}}) {
$stat_text .= "$stat_text1 $l ";
foreach my $m (keys %{$statistics{$k}->{$l}}) {
my $value = "$statistics{$k}->{$l}->{$m}";
if ($m eq "pubid" && defined($value)) {
$stat_text .= "PUBLIC \"$value\">\n";
} elsif ($m eq "sysid" && defined($value)) {
$stat_text .= "SYSTEM \"$value\">\n";
};
};
my $value = $statistics{$k}->{$l}->{emsysid};
if (defined($value) && $value ne "") {
$value =~ s/^<(.*)>(.*)/$2/o, my $si = $1;
$si =~ s/^osfile$/FILE/io;
$stat_text .= " Full name of system identifier ($si) actually referred to:\n \"$value\"\n";
} else {
$stat_text .= " No system identifier could be generated\n";
};
};
};
if ($stat_text ne "") {
print STDERR "SGML information for `$filename':\n$stat_text";
} else {
print STDERR "No SGML information for `$filename'\n"
};
};
return (join("@",@line_numbered),@full);
};
#----------------------------------------------------------------------
# Normalise data text from nsgmls (i.e. don't print the escaped text).
sub normalise_text {
my($string,$prefix) = @_;
my $result = "$prefix";
my @string;
my ($char,$state,$c);
@string = split(//,$string);
foreach $c (@string) {
if (defined $state) { # we're in an escape sequence
if ($state eq "escape") { # which just started
if ($c eq "\\") { # slash
$result .= $c;
undef $state;
} elsif ($c eq "|") { # pipe
warn "Unresolved SDATA ";
$result .= $c;
undef $state;
} elsif ($c eq "n") { # newline
$result .= "\n$prefix";
undef $state;
} elsif ($c eq "%" || $c eq "#") { # character
# `\\#\d+;' is character number in internal character set
# (if not representable by output encoding)
# `\\%\d+;' is character number in document character set
# (numeric char ref to non-SGML chars in fixed char set mode)
$char = "";
$state = "decchar";
} elsif ($c =~ /^[0-7]$/) { # character
$char = $c;
$state = "octchar";
} else {
die "Unrecognised construction";
};
} elsif ($state eq "decchar") { # reading a character code
if ($c ne ";") {
$char .= $c;
} else {
$result .= chr($char);
undef $char;
undef $state;
};
} elsif ($state eq "octchar") { # reading a charactre code
if (length($char) < 2) {
$char .= $c;
} else { # length == 2
$result .= chr(oct($char.$c));
undef $state;
undef $char;
};
} else {
die "State `$state' does not exist, stopped ";
};
} elsif ($c eq "\\") { # an escape starts
$state = "escape";
} else { # normal case
$result .= $c;
};
};
return $result;
};
#----------------------------------------------------------------------
sub my_warn {
my ($a) = @_;
warn "`$a' not implemented yet.
Please send a message to the maintainer (see source file) and include
an example (e.g. the input that caused this message)";
};
1;
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