512 lines
15 KiB
Perl
Executable file
512 lines
15 KiB
Perl
Executable file
#!/usr/bin/perl
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# Copyright (c) 2001 Nathan L. Binkert
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# All rights reserved.
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#
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# Permission to redistribute, use, copy, and modify this software
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# without fee is hereby granted, provided that the following
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# conditions are met:
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#
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# 1. This entire notice is included in all source code copies of any
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# software which is or includes a copy or modification of this
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# software.
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# 2. The name of the author may not be used to endorse or promote
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# products derived from this software without specific prior
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# written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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use Algorithm::Diff qw(diff);
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use vars qw ($opt_C $opt_c $opt_u $opt_U);
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$opt_u = "";
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$opt_c = undef;
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$diffsize = 2000;
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# After we've read up to a certain point in each file, the number of items
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# we've read from each file will differ by $FLD (could be 0)
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my $File_Length_Difference = 0;
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my $Context_Lines = 9;
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$progname = $0;
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if (scalar(@ARGV) != 2) {
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usage();
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}
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my ($filename1, $filename2);
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($filename1, $start1) = parse_filearg($ARGV[0]);
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($filename2, $start2) = parse_filearg($ARGV[1]);
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if ($filename1 eq "-" && $filename2 eq "-") {
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die "Only one of the inputs may be standard in\n";
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}
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my ($file1, $file2);
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if ($filename1 eq "-") {
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$file1 = STDIN;
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} else {
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open(FILE1, $filename1) || die "can't open $file1: $!\n";
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$file1 = FILE1;
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}
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if ($filename2 eq "-") {
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$file2 = STDIN;
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} else {
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open(FILE2, $filename2) || die "can't open $file2: $!\n";
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$file2 = FILE2;
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}
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my $file_offset1 = ffw($file1, $start1);
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my $file_offset2 = ffw($file2, $start2);
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$skip_first = 0;
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my (@buf1, @buf2, @printbuf1, @printbuf2);
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$Compare_Ahead = 0;
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while (!eof($file1) && !eof($file2)) {
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my $line1 = <$file1>; chomp $line1;
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my $line2 = <$file2>; chomp $line2;
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my $printline1 = $line1;
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my $printline2 = $line2;
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push @buf1, $line1;
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push @buf2, $line2;
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push @printbuf1, $printline1;
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push @printbuf2, $printline2;
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# while ($Compare_Ahead < $Context_Lines) {
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# $line1 = @buf1[$Compare_Ahead];
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# $line2 = @buf2[$Compare_Ahead];
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# $line2 =~ s/ *--.*$//;
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# if ($line1 ne $line2) { last; }
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# ++$Compare_Ahead;
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# }
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$line1 = @buf1[$Compare_Ahead];
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$line2 = @buf2[$Compare_Ahead];
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$line2 =~ s/ *--.*$//;
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if ($line1 ne $line2) {
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while (!eof($file1) && scalar(@buf1) < $diffsize) {
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$line = <$file1>; chomp $line;
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my $printline = $line;
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push @printbuf1, $printline;
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push @buf1, $line;
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}
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while (!eof($file2) && scalar(@buf2) < $diffsize) {
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$line = <$file2>; chomp $line;
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my $printline = $line;
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# $line =~ s/ *--.*$//;
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push @printbuf2, $printline;
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push @buf2, $line;
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}
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my $diffs = diff(\@buf1, \@buf2);
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next unless @$diffs;
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my @hunklist;
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my ($hunk,$oldhunk);
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# Loop over hunks. If a hunk overlaps with the last hunk, join them.
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# Otherwise, print out the old one.
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foreach my $piece (@$diffs) {
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$hunk = new Hunk ($piece, $Context_Lines, scalar(@buf1));
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next unless $oldhunk;
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if ($hunk->does_overlap($oldhunk)) {
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$hunk->prepend_hunk($oldhunk);
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} else {
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push @hunklist, $oldhunk;
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}
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} continue {
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$oldhunk = $hunk;
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}
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my $change = 0;
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while (scalar(@hunklist) && !$change) {
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$hunk = pop @hunklist;
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$change = $hunk->{"change"};
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}
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push @hunklist, $hunk;
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$last_start1 = $hunk->{"start1"};
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$last_start2 = $hunk->{"start2"};
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$last_end1 = $hunk->{"end1"};
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$last_end2 = $hunk->{"end2"};
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while (scalar(@hunklist)) {
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$hunk = shift @hunklist;
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# $hunk->output_diff(\@buf1, \@buf2);
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$hunk->output_diff(\@printbuf1, \@printbuf2);
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}
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$last_end1 -= $Context_Lines - 1;
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$last_end2 -= $Context_Lines - 1;
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$file_offset1 += $last_end1;
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$file_offset2 += $last_end2;
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@printbuf1 = @printbuf1[$last_end1..$#printbuf1];
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@printbuf2 = @printbuf2[$last_end2..$#printbuf2];
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@buf1 = @buf1[$last_end1..$#buf1];
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@buf2 = @buf2[$last_end2..$#buf2];
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while (scalar(@buf1) > $Context_Lines &&
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scalar(@buf2) > $Context_Lines) {
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$foo1 = @buf1[$Context_Lines];
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$foo2 = @buf2[$Context_Lines];
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if (scalar($foo1) != scalar($foo2) || $foo1 ne $foo2) { last; }
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$foo1 = shift @printbuf1;
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$foo2 = shift @printbuf2;
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$foo1 = shift @buf1;
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$foo2 = shift @buf2;
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++$file_offset1;
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++$file_offset2;
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}
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} else {
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++$file_offset1;
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++$file_offset2;
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$foo1 = shift @printbuf1;
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$foo2 = shift @printbuf2;
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$foo1 = shift @buf1;
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$foo2 = shift @buf2;
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}
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}
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close $file1;
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close $file2;
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sub ffw() {
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if (scalar(@_) != 2) { die "improper usage of ffw\n"; }
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my $FILE = $_[0];
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my $start = $_[1];
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my $count = 0;
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while ($start-- > 0 && !eof($FILE)) {
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<$FILE>;
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$count++;
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}
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if ($start > 0) {die "File too short for ffw amount\n"; }
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return $count;
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}
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sub parse_filearg() {
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$start = 0;
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split /:/, @_[0];
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if (scalar(@_) > 2) { usage(); }
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$file = $_[0];
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if (scalar(@_) > 1) { $start = $_[1]; }
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return ($file, $start);
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}
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sub usage() {
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printf "usage: $progname <file1>[:start] <file2>[:start]\n";
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exit 1;
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}
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# Package Hunk. A Hunk is a group of Blocks which overlap because of the
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# context surrounding each block. (So if we're not using context, every
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# hunk will contain one block.)
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{
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package Hunk;
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sub new {
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# Arg1 is output from &LCS::diff (which corresponds to one Block)
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# Arg2 is the number of items (lines, e.g.,) of context around each block
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#
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# This subroutine changes $File_Length_Difference
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#
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# Fields in a Hunk:
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# blocks - a list of Block objects
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# start - index in file 1 where first block of the hunk starts
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# end - index in file 1 where last block of the hunk ends
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#
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# Variables:
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# before_diff - how much longer file 2 is than file 1 due to all hunks
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# until but NOT including this one
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# after_diff - difference due to all hunks including this one
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my ($class, $piece, $context_items, $maxlen) = @_;
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my $block = new Block ($piece); # this modifies $FLD!
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my $before_diff = $File_Length_Difference; # BEFORE this hunk
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my $after_diff = $before_diff + $block->{"length_diff"};
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$File_Length_Difference += $block->{"length_diff"};
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# @remove_array and @insert_array hold the items to insert and remove
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# Save the start & beginning of each array. If the array doesn't exist
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# though (e.g., we're only adding items in this block), then figure
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# out the line number based on the line number of the other file and
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# the current difference in file lenghts
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my @remove_array = $block->remove;
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my @insert_array = $block->insert;
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my ($a1, $a2, $b1, $b2, $start1, $start2, $end1, $end2, $change);
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$a1 = @remove_array ? $remove_array[0 ]->{"item_no"} : -1;
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$a2 = @remove_array ? $remove_array[-1]->{"item_no"} : -1;
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$b1 = @insert_array ? $insert_array[0 ]->{"item_no"} : -1;
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$b2 = @insert_array ? $insert_array[-1]->{"item_no"} : -1;
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$start1 = $a1 == -1 ? $b1 - $before_diff : $a1;
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$end1 = $a2 == -1 ? $b2 - $after_diff : $a2;
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$start2 = $b1 == -1 ? $a1 + $before_diff : $b1;
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$end2 = $b2 == -1 ? $a2 + $after_diff : $b2;
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$change = scalar(@remove_array) && scalar(@insert_array);
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# At first, a hunk will have just one Block in it
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my $hunk = {
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"start1" => $start1,
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"start2" => $start2,
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"end1" => $end1,
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"end2" => $end2,
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"maxlen" => $maxlen,
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"change" => $change,
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"blocks" => [$block],
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};
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bless $hunk, $class;
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$hunk->flag_context($context_items);
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return $hunk;
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}
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# Change the "start" and "end" fields to note that context should be added
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# to this hunk
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sub flag_context {
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my ($hunk, $context_items) = @_;
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return unless $context_items; # no context
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# add context before
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my $start1 = $hunk->{"start1"};
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my $num_added = $context_items > $start1 ? $start1 : $context_items;
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$hunk->{"start1"} -= $num_added;
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$hunk->{"start2"} -= $num_added;
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# context after
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my $end1 = $hunk->{"end1"};
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$num_added = ($end1+$context_items > $hunk->{"maxlen"}) ?
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$hunk->{"maxlen"} - $end1 :
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$context_items;
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$hunk->{"end1"} += $num_added;
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$hunk->{"end2"} += $num_added;
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}
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# Is there an overlap between hunk arg0 and old hunk arg1?
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# Note: if end of old hunk is one less than beginning of second, they overlap
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sub does_overlap {
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my ($hunk, $oldhunk) = @_;
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return "" unless $oldhunk; # first time through, $oldhunk is empty
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# Do I actually need to test both?
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return ($hunk->{"start1"} - $oldhunk->{"end1"} <= 1 ||
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$hunk->{"start2"} - $oldhunk->{"end2"} <= 1);
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}
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# Prepend hunk arg1 to hunk arg0
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# Note that arg1 isn't updated! Only arg0 is.
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sub prepend_hunk {
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my ($hunk, $oldhunk) = @_;
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$hunk->{"start1"} = $oldhunk->{"start1"};
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$hunk->{"start2"} = $oldhunk->{"start2"};
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unshift (@{$hunk->{"blocks"}}, @{$oldhunk->{"blocks"}});
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}
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# DIFF OUTPUT ROUTINES. THESE ROUTINES CONTAIN DIFF FORMATTING INFO...
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sub output_diff {
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if (defined $main::opt_u) {&output_unified_diff(@_)}
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elsif (defined $main::opt_c) {&output_context_diff(@_)}
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else {die "unknown diff"}
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}
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sub output_unified_diff {
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my ($hunk, $fileref1, $fileref2) = @_;
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my @blocklist;
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# Calculate item number range.
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my $range1 = $hunk->unified_range(1, $file_offset1);
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my $range2 = $hunk->unified_range(2, $file_offset2);
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print "@@ -$range1 +$range2 @@\n";
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# Outlist starts containing the hunk of file 1.
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# Removing an item just means putting a '-' in front of it.
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# Inserting an item requires getting it from file2 and splicing it in.
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# We splice in $num_added items. Remove blocks use $num_added because
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# splicing changed the length of outlist.
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# We remove $num_removed items. Insert blocks use $num_removed because
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# their item numbers---corresponding to positions in file *2*--- don't take
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# removed items into account.
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my $low = $hunk->{"start1"};
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my $hi = $hunk->{"end1"};
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my ($num_added, $num_removed) = (0,0);
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my @outlist = @$fileref1[$low..$hi];
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map {s/^/ /} @outlist; # assume it's just context
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foreach my $block (@{$hunk->{"blocks"}}) {
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foreach my $item ($block->remove) {
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my $op = $item->{"sign"}; # -
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my $offset = $item->{"item_no"} - $low + $num_added;
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$outlist[$offset] =~ s/^ /$op/;
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$num_removed++;
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}
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foreach my $item ($block->insert) {
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my $op = $item->{"sign"}; # +
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my $i = $item->{"item_no"};
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my $offset = $i - $hunk->{"start2"} + $num_removed;
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splice(@outlist,$offset,0,"$op$$fileref2[$i]");
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$num_added++;
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}
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}
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map {s/$/\n/} @outlist; # add \n's
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print @outlist;
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}
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sub output_context_diff {
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my ($hunk, $fileref1, $fileref2) = @_;
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my @blocklist;
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print "***************\n";
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# Calculate item number range.
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my $range1 = $hunk->context_range(1, $file_offset1);
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my $range2 = $hunk->context_range(2, $file_offset2);
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# Print out file 1 part for each block in context diff format if there are
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# any blocks that remove items
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print "*** $range1 ****\n";
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my $low = $hunk->{"start1"};
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my $hi = $hunk->{"end1"};
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if (@blocklist = grep {$_->remove} @{$hunk->{"blocks"}}) {
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my @outlist = @$fileref1[$low..$hi];
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map {s/^/ /} @outlist; # assume it's just context
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foreach my $block (@blocklist) {
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my $op = $block->op; # - or !
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foreach my $item ($block->remove) {
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$outlist[$item->{"item_no"} - $low] =~ s/^ /$op/;
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}
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}
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map {s/$/\n/} @outlist; # add \n's
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print @outlist;
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}
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print "--- $range2 ----\n";
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$low = $hunk->{"start2"};
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$hi = $hunk->{"end2"};
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if (@blocklist = grep {$_->insert} @{$hunk->{"blocks"}}) {
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my @outlist = @$fileref2[$low..$hi];
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map {s/^/ /} @outlist; # assume it's just context
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foreach my $block (@blocklist) {
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my $op = $block->op; # + or !
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foreach my $item ($block->insert) {
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$outlist[$item->{"item_no"} - $low] =~ s/^ /$op/;
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}
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}
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map {s/$/\n/} @outlist; # add \n's
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print @outlist;
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}
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}
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sub context_range {
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# Generate a range of item numbers to print. Only print 1 number if the range
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# has only one item in it. Otherwise, it's 'start,end'
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my ($hunk, $flag, $offset) = @_;
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my ($start, $end) = ($hunk->{"start$flag"},$hunk->{"end$flag"});
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# index from 1, not zero
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$start += $offset + 1;
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$end += $offset + 1;
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my $range = ($start < $end) ? "$start,$end" : $end;
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return $range;
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}
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sub unified_range {
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# Generate a range of item numbers to print for unified diff
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# Print number where block starts, followed by number of lines in the block
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# (don't print number of lines if it's 1)
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my ($hunk, $flag, $offset) = @_;
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my ($start, $end) = ($hunk->{"start$flag"},$hunk->{"end$flag"});
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# index from 1, not zero
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$start += $offset + 1;
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$end += $offset + 1;
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my $length = $end - $start + 1;
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my $first = $length < 2 ? $end : $start; # strange, but correct...
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my $range = $length== 1 ? $first : "$first,$length";
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return $range;
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}
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} # end Package Hunk
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# Package Block. A block is an operation removing, adding, or changing
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# a group of items. Basically, this is just a list of changes, where each
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# change adds or deletes a single item.
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# (Change could be a separate class, but it didn't seem worth it)
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{
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package Block;
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sub new {
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# Input is a chunk from &Algorithm::LCS::diff
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# Fields in a block:
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# length_diff - how much longer file 2 is than file 1 due to this block
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# Each change has:
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# sign - '+' for insert, '-' for remove
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# item_no - number of the item in the file (e.g., line number)
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# We don't bother storing the text of the item
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#
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my ($class,$chunk) = @_;
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my @changes = ();
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# This just turns each change into a hash.
|
|
foreach my $item (@$chunk) {
|
|
my ($sign, $item_no, $text) = @$item;
|
|
my $hashref = {"sign" => $sign, "item_no" => $item_no};
|
|
push @changes, $hashref;
|
|
}
|
|
|
|
my $block = { "changes" => \@changes };
|
|
bless $block, $class;
|
|
|
|
$block->{"length_diff"} = $block->insert - $block->remove;
|
|
return $block;
|
|
}
|
|
|
|
|
|
# LOW LEVEL FUNCTIONS
|
|
sub op {
|
|
# what kind of block is this?
|
|
my $block = shift;
|
|
my $insert = $block->insert;
|
|
my $remove = $block->remove;
|
|
|
|
$remove && $insert and return '!';
|
|
$remove and return '-';
|
|
$insert and return '+';
|
|
warn "unknown block type";
|
|
return '^'; # context block
|
|
}
|
|
|
|
# Returns a list of the changes in this block that remove items
|
|
# (or the number of removals if called in scalar context)
|
|
sub remove { return grep {$_->{"sign"} eq '-'} @{shift->{"changes"}}; }
|
|
|
|
# Returns a list of the changes in this block that insert items
|
|
sub insert { return grep {$_->{"sign"} eq '+'} @{shift->{"changes"}}; }
|
|
|
|
} # end of package Block
|