mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-08-30 22:37:42 +02:00
912 lines
27 KiB
PHP
912 lines
27 KiB
PHP
<?php
|
|
/*
|
|
* Copyright (C) 2000, 2001 Geoffrey T. Dairiki <dairiki@dairiki.org>
|
|
*
|
|
* This file is part of PhpWiki.
|
|
*
|
|
* PhpWiki 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.
|
|
*
|
|
* PhpWiki 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 PhpWiki; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
// difflib.php
|
|
//
|
|
// A PHP diff engine for phpwiki.
|
|
|
|
abstract class DiffOp
|
|
{
|
|
public $type;
|
|
public $orig;
|
|
public $final;
|
|
|
|
abstract public function reverse();
|
|
|
|
public function norig()
|
|
{
|
|
return $this->orig ? sizeof($this->orig) : 0;
|
|
}
|
|
|
|
public function nfinal()
|
|
{
|
|
return $this->final ? sizeof($this->final) : 0;
|
|
}
|
|
}
|
|
|
|
class DiffOp_Copy extends DiffOp
|
|
{
|
|
public $type = 'copy';
|
|
|
|
function __construct($orig, $final = false)
|
|
{
|
|
if (!is_array($final))
|
|
$final = $orig;
|
|
$this->orig = $orig;
|
|
$this->final = $final;
|
|
}
|
|
|
|
public function reverse()
|
|
{
|
|
return new DiffOp_Copy($this->final, $this->orig);
|
|
}
|
|
}
|
|
|
|
class DiffOp_Delete extends DiffOp
|
|
{
|
|
public $type = 'delete';
|
|
|
|
function __construct($lines)
|
|
{
|
|
$this->orig = $lines;
|
|
$this->final = false;
|
|
}
|
|
|
|
public function reverse()
|
|
{
|
|
return new DiffOp_Add($this->orig);
|
|
}
|
|
}
|
|
|
|
class DiffOp_Add extends DiffOp
|
|
{
|
|
public $type = 'add';
|
|
|
|
function __construct($lines)
|
|
{
|
|
$this->final = $lines;
|
|
$this->orig = false;
|
|
}
|
|
|
|
public function reverse()
|
|
{
|
|
return new DiffOp_Delete($this->final);
|
|
}
|
|
}
|
|
|
|
class DiffOp_Change extends DiffOp
|
|
{
|
|
public $type = 'change';
|
|
|
|
function __construct($orig, $final)
|
|
{
|
|
$this->orig = $orig;
|
|
$this->final = $final;
|
|
}
|
|
|
|
public function reverse()
|
|
{
|
|
return new DiffOp_Change($this->final, $this->orig);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Class used internally by Diff to actually compute the diffs.
|
|
*
|
|
* The algorithm used here is mostly lifted from the perl module
|
|
* Algorithm::Diff (version 1.06) by Ned Konz, which is available at:
|
|
* http://www.perl.com/CPAN/authors/id/N/NE/NEDKONZ/Algorithm-Diff-1.06.zip
|
|
*
|
|
* More ideas are taken from:
|
|
* http://www.ics.uci.edu/~eppstein/161/960229.html
|
|
*
|
|
* Some ideas are (and a bit of code) are from from analyze.c, from GNU
|
|
* diffutils-2.7, which can be found at:
|
|
* ftp://gnudist.gnu.org/pub/gnu/diffutils/diffutils-2.7.tar.gz
|
|
*
|
|
* Finally, some ideas (subdivision by NCHUNKS > 2, and some optimizations)
|
|
* are my own.
|
|
*
|
|
* @author Geoffrey T. Dairiki
|
|
* @access private
|
|
*/
|
|
class DiffEngine
|
|
{
|
|
public $xchanged;
|
|
public $ychanged;
|
|
public $xv;
|
|
public $yv;
|
|
public $xind;
|
|
public $yind;
|
|
public $lcs;
|
|
public $seq;
|
|
public $in_seq;
|
|
|
|
public function diff($from_lines, $to_lines)
|
|
{
|
|
$n_from = sizeof($from_lines ?? []);
|
|
$n_to = sizeof($to_lines ?? []);
|
|
|
|
$this->xchanged = $this->ychanged = array();
|
|
$this->xv = $this->yv = array();
|
|
$this->xind = $this->yind = array();
|
|
unset($this->seq);
|
|
unset($this->in_seq);
|
|
unset($this->lcs);
|
|
|
|
// Skip leading common lines.
|
|
for ($skip = 0; $skip < $n_from && $skip < $n_to; $skip++) {
|
|
if ($from_lines[$skip] != $to_lines[$skip])
|
|
break;
|
|
$this->xchanged[$skip] = $this->ychanged[$skip] = false;
|
|
}
|
|
// Skip trailing common lines.
|
|
$xi = $n_from;
|
|
$yi = $n_to;
|
|
for ($endskip = 0; --$xi > $skip && --$yi > $skip; $endskip++) {
|
|
if ($from_lines[$xi] != $to_lines[$yi])
|
|
break;
|
|
$this->xchanged[$xi] = $this->ychanged[$yi] = false;
|
|
}
|
|
|
|
// Ignore lines which do not exist in both files.
|
|
for ($xi = $skip; $xi < $n_from - $endskip; $xi++)
|
|
$xhash[$from_lines[$xi]] = 1;
|
|
for ($yi = $skip; $yi < $n_to - $endskip; $yi++) {
|
|
$line = $to_lines[$yi];
|
|
if (($this->ychanged[$yi] = empty($xhash[$line])))
|
|
continue;
|
|
$yhash[$line] = 1;
|
|
$this->yv[] = $line;
|
|
$this->yind[] = $yi;
|
|
}
|
|
for ($xi = $skip; $xi < $n_from - $endskip; $xi++) {
|
|
$line = $from_lines[$xi];
|
|
if (($this->xchanged[$xi] = empty($yhash[$line])))
|
|
continue;
|
|
$this->xv[] = $line;
|
|
$this->xind[] = $xi;
|
|
}
|
|
|
|
// Find the LCS.
|
|
$this->compareseq(0, sizeof($this->xv ?? []), 0, sizeof($this->yv ?? []));
|
|
|
|
// Merge edits when possible
|
|
$this->shift_boundaries($from_lines, $this->xchanged, $this->ychanged);
|
|
$this->shift_boundaries($to_lines, $this->ychanged, $this->xchanged);
|
|
|
|
// Compute the edit operations.
|
|
$edits = array();
|
|
$xi = $yi = 0;
|
|
while ($xi < $n_from || $yi < $n_to) {
|
|
assert($yi < $n_to || $this->xchanged[$xi]);
|
|
assert($xi < $n_from || $this->ychanged[$yi]);
|
|
|
|
// Skip matching "snake".
|
|
$copy = array();
|
|
while ($xi < $n_from && $yi < $n_to
|
|
&& !$this->xchanged[$xi] && !$this->ychanged[$yi]) {
|
|
$copy[] = $from_lines[$xi++];
|
|
++$yi;
|
|
}
|
|
if ($copy)
|
|
$edits[] = new DiffOp_Copy($copy);
|
|
|
|
// Find deletes & adds.
|
|
$delete = array();
|
|
while ($xi < $n_from && $this->xchanged[$xi])
|
|
$delete[] = $from_lines[$xi++];
|
|
|
|
$add = array();
|
|
while ($yi < $n_to && $this->ychanged[$yi])
|
|
$add[] = $to_lines[$yi++];
|
|
|
|
if ($delete && $add)
|
|
$edits[] = new DiffOp_Change($delete, $add);
|
|
elseif ($delete)
|
|
$edits[] = new DiffOp_Delete($delete);
|
|
elseif ($add)
|
|
$edits[] = new DiffOp_Add($add);
|
|
}
|
|
return $edits;
|
|
}
|
|
|
|
/* Divide the Largest Common Subsequence (LCS) of the sequences
|
|
* [XOFF, XLIM) and [YOFF, YLIM) into NCHUNKS approximately equally
|
|
* sized segments.
|
|
*
|
|
* Returns (LCS, PTS). LCS is the length of the LCS. PTS is an
|
|
* array of NCHUNKS+1 (X, Y) indexes giving the diving points between
|
|
* sub sequences. The first sub-sequence is contained in [X0, X1),
|
|
* [Y0, Y1), the second in [X1, X2), [Y1, Y2) and so on. Note
|
|
* that (X0, Y0) == (XOFF, YOFF) and
|
|
* (X[NCHUNKS], Y[NCHUNKS]) == (XLIM, YLIM).
|
|
*
|
|
* This function assumes that the first lines of the specified portions
|
|
* of the two files do not match, and likewise that the last lines do not
|
|
* match. The caller must trim matching lines from the beginning and end
|
|
* of the portions it is going to specify.
|
|
*/
|
|
private function diag($xoff, $xlim, $yoff, $ylim, $nchunks)
|
|
{
|
|
$flip = false;
|
|
|
|
if ($xlim - $xoff > $ylim - $yoff) {
|
|
// Things seems faster (I'm not sure I understand why)
|
|
// when the shortest sequence in X.
|
|
$flip = true;
|
|
list ($xoff, $xlim, $yoff, $ylim)
|
|
= array($yoff, $ylim, $xoff, $xlim);
|
|
}
|
|
|
|
if ($flip)
|
|
for ($i = $ylim - 1; $i >= $yoff; $i--)
|
|
$ymatches[$this->xv[$i]][] = $i;
|
|
else
|
|
for ($i = $ylim - 1; $i >= $yoff; $i--)
|
|
$ymatches[$this->yv[$i]][] = $i;
|
|
|
|
$this->lcs = 0;
|
|
$this->seq[0] = $yoff - 1;
|
|
$this->in_seq = array();
|
|
$ymids[0] = array();
|
|
|
|
$numer = $xlim - $xoff + $nchunks - 1;
|
|
$x = $xoff;
|
|
for ($chunk = 0; $chunk < $nchunks; $chunk++) {
|
|
if ($chunk > 0)
|
|
for ($i = 0; $i <= $this->lcs; $i++)
|
|
$ymids[$i][$chunk - 1] = $this->seq[$i];
|
|
|
|
$x1 = $xoff + (int)(($numer + ($xlim - $xoff) * $chunk) / $nchunks);
|
|
for (; $x < $x1; $x++) {
|
|
$line = $flip ? $this->yv[$x] : $this->xv[$x];
|
|
if (empty($ymatches[$line]))
|
|
continue;
|
|
$matches = $ymatches[$line];
|
|
reset($matches);
|
|
$pointer = 0;
|
|
foreach ($matches as $y) {
|
|
$pointer++;
|
|
if (empty($this->in_seq[$y])) {
|
|
$k = $this->lcs_pos($y);
|
|
assert($k > 0);
|
|
$ymids[$k] = $ymids[$k - 1];
|
|
break;
|
|
}
|
|
}
|
|
foreach (array_slice($matches ?? [], $pointer ?? 0) as $y) {
|
|
if ($y > $this->seq[$k - 1]) {
|
|
assert($y < $this->seq[$k]);
|
|
// Optimization: this is a common case:
|
|
// next match is just replacing previous match.
|
|
$this->in_seq[$this->seq[$k]] = false;
|
|
$this->seq[$k] = $y;
|
|
$this->in_seq[$y] = 1;
|
|
} elseif (empty($this->in_seq[$y])) {
|
|
$k = $this->lcs_pos($y);
|
|
assert($k > 0);
|
|
$ymids[$k] = $ymids[$k - 1];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
$seps[] = $flip ? array($yoff, $xoff) : array($xoff, $yoff);
|
|
$ymid = $ymids[$this->lcs];
|
|
for ($n = 0; $n < $nchunks - 1; $n++) {
|
|
$x1 = $xoff + (int)(($numer + ($xlim - $xoff) * $n) / $nchunks);
|
|
$y1 = $ymid[$n] + 1;
|
|
$seps[] = $flip ? array($y1, $x1) : array($x1, $y1);
|
|
}
|
|
$seps[] = $flip ? array($ylim, $xlim) : array($xlim, $ylim);
|
|
|
|
return array($this->lcs, $seps);
|
|
}
|
|
|
|
private function lcs_pos($ypos)
|
|
{
|
|
$end = $this->lcs;
|
|
if ($end == 0 || $ypos > $this->seq[$end]) {
|
|
$this->seq[++$this->lcs] = $ypos;
|
|
$this->in_seq[$ypos] = 1;
|
|
return $this->lcs;
|
|
}
|
|
|
|
$beg = 1;
|
|
while ($beg < $end) {
|
|
$mid = (int)(($beg + $end) / 2);
|
|
if ($ypos > $this->seq[$mid])
|
|
$beg = $mid + 1;
|
|
else
|
|
$end = $mid;
|
|
}
|
|
|
|
assert($ypos != $this->seq[$end]);
|
|
|
|
$this->in_seq[$this->seq[$end]] = false;
|
|
$this->seq[$end] = $ypos;
|
|
$this->in_seq[$ypos] = 1;
|
|
return $end;
|
|
}
|
|
|
|
/* Find LCS of two sequences.
|
|
*
|
|
* The results are recorded in the vectors $this->{x,y}changed[], by
|
|
* storing a 1 in the element for each line that is an insertion
|
|
* or deletion (ie. is not in the LCS).
|
|
*
|
|
* The subsequence of file 0 is [XOFF, XLIM) and likewise for file 1.
|
|
*
|
|
* Note that XLIM, YLIM are exclusive bounds.
|
|
* All line numbers are origin-0 and discarded lines are not counted.
|
|
*/
|
|
private function compareseq($xoff, $xlim, $yoff, $ylim)
|
|
{
|
|
// Slide down the bottom initial diagonal.
|
|
while ($xoff < $xlim && $yoff < $ylim
|
|
&& $this->xv[$xoff] == $this->yv[$yoff]) {
|
|
++$xoff;
|
|
++$yoff;
|
|
}
|
|
|
|
// Slide up the top initial diagonal.
|
|
while ($xlim > $xoff && $ylim > $yoff
|
|
&& $this->xv[$xlim - 1] == $this->yv[$ylim - 1]) {
|
|
--$xlim;
|
|
--$ylim;
|
|
}
|
|
|
|
if ($xoff == $xlim || $yoff == $ylim)
|
|
$lcs = 0;
|
|
else {
|
|
// This is ad hoc but seems to work well.
|
|
//$nchunks = sqrt(min($xlim - $xoff, $ylim - $yoff) / 2.5);
|
|
//$nchunks = max(2,min(8,(int)$nchunks));
|
|
$nchunks = min(7, $xlim - $xoff, $ylim - $yoff) + 1;
|
|
list ($lcs, $seps)
|
|
= $this->diag($xoff, $xlim, $yoff, $ylim, $nchunks);
|
|
}
|
|
|
|
if ($lcs == 0) {
|
|
// X and Y sequences have no common subsequence:
|
|
// mark all changed.
|
|
while ($yoff < $ylim)
|
|
$this->ychanged[$this->yind[$yoff++]] = 1;
|
|
while ($xoff < $xlim)
|
|
$this->xchanged[$this->xind[$xoff++]] = 1;
|
|
} else {
|
|
// Use the partitions to split this problem into subproblems.
|
|
reset($seps);
|
|
$pt1 = $seps[0];
|
|
while ($pt2 = next($seps)) {
|
|
$this->compareseq($pt1[0], $pt2[0], $pt1[1], $pt2[1]);
|
|
$pt1 = $pt2;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Adjust inserts/deletes of identical lines to join changes
|
|
* as much as possible.
|
|
*
|
|
* We do something when a run of changed lines include a
|
|
* line at one end and has an excluded, identical line at the other.
|
|
* We are free to choose which identical line is included.
|
|
* `compareseq' usually chooses the one at the beginning,
|
|
* but usually it is cleaner to consider the following identical line
|
|
* to be the "change".
|
|
*
|
|
* This is extracted verbatim from analyze.c (GNU diffutils-2.7).
|
|
*/
|
|
private function shift_boundaries($lines, &$changed, $other_changed)
|
|
{
|
|
$i = 0;
|
|
$j = 0;
|
|
|
|
assert(sizeof($lines ?? []) == sizeof($changed ?? []));
|
|
$len = sizeof($lines ?? []);
|
|
$other_len = sizeof($other_changed ?? []);
|
|
|
|
while (1) {
|
|
/*
|
|
* Scan forwards to find beginning of another run of changes.
|
|
* Also keep track of the corresponding point in the other file.
|
|
*
|
|
* Throughout this code, $i and $j are adjusted together so that
|
|
* the first $i elements of $changed and the first $j elements
|
|
* of $other_changed both contain the same number of zeros
|
|
* (unchanged lines).
|
|
* Furthermore, $j is always kept so that $j == $other_len or
|
|
* $other_changed[$j] == false.
|
|
*/
|
|
while ($j < $other_len && $other_changed[$j])
|
|
$j++;
|
|
|
|
while ($i < $len && !$changed[$i]) {
|
|
assert($j < $other_len && ! $other_changed[$j]);
|
|
$i++;
|
|
$j++;
|
|
while ($j < $other_len && $other_changed[$j])
|
|
$j++;
|
|
}
|
|
|
|
if ($i == $len)
|
|
break;
|
|
|
|
$start = $i;
|
|
|
|
// Find the end of this run of changes.
|
|
while (++$i < $len && $changed[$i])
|
|
continue;
|
|
|
|
do {
|
|
/*
|
|
* Record the length of this run of changes, so that
|
|
* we can later determine whether the run has grown.
|
|
*/
|
|
$runlength = $i - $start;
|
|
|
|
/*
|
|
* Move the changed region back, so long as the
|
|
* previous unchanged line matches the last changed one.
|
|
* This merges with previous changed regions.
|
|
*/
|
|
while ($start > 0 && $lines[$start - 1] == $lines[$i - 1]) {
|
|
$changed[--$start] = 1;
|
|
$changed[--$i] = false;
|
|
while ($start > 0 && $changed[$start - 1])
|
|
$start--;
|
|
assert($j > 0);
|
|
while ($other_changed[--$j])
|
|
continue;
|
|
assert($j >= 0 && !$other_changed[$j]);
|
|
}
|
|
|
|
/*
|
|
* Set CORRESPONDING to the end of the changed run, at the last
|
|
* point where it corresponds to a changed run in the other file.
|
|
* CORRESPONDING == LEN means no such point has been found.
|
|
*/
|
|
$corresponding = $j < $other_len ? $i : $len;
|
|
|
|
/*
|
|
* Move the changed region forward, so long as the
|
|
* first changed line matches the following unchanged one.
|
|
* This merges with following changed regions.
|
|
* Do this second, so that if there are no merges,
|
|
* the changed region is moved forward as far as possible.
|
|
*/
|
|
while ($i < $len && $lines[$start] == $lines[$i]) {
|
|
$changed[$start++] = false;
|
|
$changed[$i++] = 1;
|
|
while ($i < $len && $changed[$i])
|
|
$i++;
|
|
|
|
assert($j < $other_len && ! $other_changed[$j]);
|
|
$j++;
|
|
if ($j < $other_len && $other_changed[$j]) {
|
|
$corresponding = $i;
|
|
while ($j < $other_len && $other_changed[$j])
|
|
$j++;
|
|
}
|
|
}
|
|
} while ($runlength != $i - $start);
|
|
|
|
/*
|
|
* If possible, move the fully-merged run of changes
|
|
* back to a corresponding run in the other file.
|
|
*/
|
|
while ($corresponding < $i) {
|
|
$changed[--$start] = 1;
|
|
$changed[--$i] = 0;
|
|
assert($j > 0);
|
|
while ($other_changed[--$j])
|
|
continue;
|
|
assert($j >= 0 && !$other_changed[$j]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Class representing a 'diff' between two sequences of strings.
|
|
*/
|
|
class Diff
|
|
{
|
|
public $edits;
|
|
|
|
/**
|
|
* Computes diff between sequences of strings.
|
|
*
|
|
* @param $from_lines array An array of strings.
|
|
* (Typically these are lines from a file.)
|
|
* @param $to_lines array An array of strings.
|
|
*/
|
|
function __construct($from_lines, $to_lines)
|
|
{
|
|
$eng = new DiffEngine();
|
|
$this->edits = $eng->diff($from_lines, $to_lines);
|
|
}
|
|
|
|
/**
|
|
* Check for empty diff.
|
|
*
|
|
* @return bool True iff two sequences were identical.
|
|
*/
|
|
public function isEmpty()
|
|
{
|
|
foreach ($this->edits as $edit) {
|
|
if ($edit->type != 'copy')
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Get the original set of lines.
|
|
*
|
|
* This reconstructs the $from_lines parameter passed to the
|
|
* constructor.
|
|
*
|
|
* @return array The original sequence of strings.
|
|
*/
|
|
public function orig()
|
|
{
|
|
$lines = array();
|
|
|
|
foreach ($this->edits as $edit) {
|
|
if ($edit->orig)
|
|
array_splice($lines, sizeof($lines ?? []), 0, $edit->orig);
|
|
}
|
|
return $lines;
|
|
}
|
|
|
|
/**
|
|
* Get the final set of lines.
|
|
*
|
|
* This reconstructs the $to_lines parameter passed to the
|
|
* constructor.
|
|
*
|
|
* @return array The sequence of strings.
|
|
*/
|
|
public function finalize()
|
|
{
|
|
$lines = array();
|
|
|
|
foreach ($this->edits as $edit) {
|
|
if ($edit->final)
|
|
array_splice($lines, sizeof($lines ?? []), 0, $edit->final);
|
|
}
|
|
return $lines;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* FIXME: bad name.
|
|
*/
|
|
class MappedDiff
|
|
extends Diff
|
|
{
|
|
/**
|
|
* Computes diff between sequences of strings.
|
|
*
|
|
* This can be used to compute things like
|
|
* case-insensitve diffs, or diffs which ignore
|
|
* changes in white-space.
|
|
*
|
|
* @param $from_lines array An array of strings.
|
|
* (Typically these are lines from a file.)
|
|
*
|
|
* @param $to_lines array An array of strings.
|
|
*
|
|
* @param $mapped_from_lines array This array should
|
|
* have the same size number of elements as $from_lines.
|
|
* The elements in $mapped_from_lines and
|
|
* $mapped_to_lines are what is actually compared
|
|
* when computing the diff.
|
|
*
|
|
* @param $mapped_to_lines array This array should
|
|
* have the same number of elements as $to_lines.
|
|
*/
|
|
function __construct($from_lines, $to_lines,
|
|
$mapped_from_lines, $mapped_to_lines)
|
|
{
|
|
|
|
assert(sizeof($from_lines ?? []) == sizeof($mapped_from_lines ?? []));
|
|
assert(sizeof($to_lines ?? []) == sizeof($mapped_to_lines ?? []));
|
|
|
|
parent::__construct($mapped_from_lines, $mapped_to_lines);
|
|
|
|
$xi = $yi = 0;
|
|
// Optimizing loop invariants:
|
|
// http://phplens.com/lens/php-book/optimizing-debugging-php.php
|
|
for ($i = 0, $max = sizeof($this->edits); $i < $max; $i++) {
|
|
$orig = &$this->edits[$i]->orig;
|
|
if (is_array($orig)) {
|
|
$orig = array_slice($from_lines ?? [], $xi ?? 0, sizeof($orig ?? []));
|
|
$xi += sizeof($orig ?? []);
|
|
}
|
|
|
|
$final = &$this->edits[$i]->final;
|
|
if (is_array($final)) {
|
|
$final = array_slice($to_lines ?? [], $yi ?? 0, sizeof($final ?? []));
|
|
$yi += sizeof($final ?? []);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A class to format Diffs
|
|
*
|
|
* This class formats the diff in classic diff format.
|
|
* It is intended that this class be customized via inheritance,
|
|
* to obtain fancier outputs.
|
|
*/
|
|
class DiffFormatter
|
|
{
|
|
/**
|
|
* Number of leading context "lines" to preserve.
|
|
*
|
|
* This should be left at zero for this class, but subclasses
|
|
* may want to set this to other values.
|
|
*/
|
|
public $leading_context_lines = 0;
|
|
|
|
/**
|
|
* Number of trailing context "lines" to preserve.
|
|
*
|
|
* This should be left at zero for this class, but subclasses
|
|
* may want to set this to other values.
|
|
*/
|
|
public $trailing_context_lines = 0;
|
|
|
|
/**
|
|
* Format a diff.
|
|
*
|
|
* @param $diff object A Diff object.
|
|
* @return string The formatted output.
|
|
*/
|
|
public function format($diff)
|
|
{
|
|
|
|
$xi = $yi = 1;
|
|
$block = false;
|
|
$context = array();
|
|
|
|
$nlead = $this->leading_context_lines;
|
|
$ntrail = $this->trailing_context_lines;
|
|
|
|
$this->start_diff();
|
|
$x0 = 0;
|
|
$y0 = 0;
|
|
|
|
foreach ($diff->edits as $edit) {
|
|
if ($edit->type == 'copy') {
|
|
if (is_array($block)) {
|
|
if (sizeof($edit->orig ?? []) <= $nlead + $ntrail) {
|
|
$block[] = $edit;
|
|
} else {
|
|
if ($ntrail) {
|
|
$context = array_slice($edit->orig ?? [], 0, $ntrail);
|
|
$block[] = new DiffOp_Copy($context);
|
|
}
|
|
$this->block($x0, $ntrail + $xi - $x0,
|
|
$y0, $ntrail + $yi - $y0,
|
|
$block);
|
|
$block = false;
|
|
}
|
|
}
|
|
$context = $edit->orig;
|
|
} else {
|
|
if (!is_array($block)) {
|
|
$context = array_slice($context ?? [], max(0, sizeof($context ?? []) - $nlead) ?? 0);
|
|
$x0 = $xi - sizeof($context ?? []);
|
|
$y0 = $yi - sizeof($context ?? []);
|
|
$block = array();
|
|
if ($context)
|
|
$block[] = new DiffOp_Copy($context);
|
|
}
|
|
$block[] = $edit;
|
|
}
|
|
|
|
if ($edit->orig)
|
|
$xi += sizeof($edit->orig ?? []);
|
|
if ($edit->final)
|
|
$yi += sizeof($edit->final ?? []);
|
|
}
|
|
|
|
if (is_array($block))
|
|
$this->block($x0, $xi - $x0,
|
|
$y0, $yi - $y0,
|
|
$block);
|
|
|
|
return $this->end_diff();
|
|
}
|
|
|
|
private function block($xbeg, $xlen, $ybeg, $ylen, &$edits)
|
|
{
|
|
$this->start_block($this->block_header($xbeg, $xlen, $ybeg, $ylen));
|
|
foreach ($edits as $edit) {
|
|
if ($edit->type == 'copy')
|
|
$this->context($edit->orig);
|
|
elseif ($edit->type == 'add')
|
|
$this->added($edit->final);
|
|
elseif ($edit->type == 'delete')
|
|
$this->deleted($edit->orig);
|
|
elseif ($edit->type == 'change')
|
|
$this->changed($edit->orig, $edit->final);
|
|
else
|
|
trigger_error("Unknown edit type", E_USER_ERROR);
|
|
}
|
|
$this->end_block();
|
|
}
|
|
|
|
protected function start_diff()
|
|
{
|
|
ob_start();
|
|
}
|
|
|
|
protected function end_diff()
|
|
{
|
|
$val = ob_get_contents();
|
|
ob_end_clean();
|
|
return $val;
|
|
}
|
|
|
|
protected function block_header($xbeg, $xlen, $ybeg, $ylen)
|
|
{
|
|
if ($xlen > 1)
|
|
$xbeg .= "," . ($xbeg + $xlen - 1);
|
|
if ($ylen > 1)
|
|
$ybeg .= "," . ($ybeg + $ylen - 1);
|
|
|
|
return $xbeg . ($xlen ? ($ylen ? 'c' : 'd') : 'a') . $ybeg;
|
|
}
|
|
|
|
protected function start_block($header)
|
|
{
|
|
echo $header;
|
|
}
|
|
|
|
protected function end_block()
|
|
{
|
|
}
|
|
|
|
protected function lines($lines, $prefix = ' ')
|
|
{
|
|
foreach ($lines as $line)
|
|
echo "$prefix $line\n";
|
|
}
|
|
|
|
protected function context($lines)
|
|
{
|
|
$this->lines($lines);
|
|
}
|
|
|
|
protected function added($lines)
|
|
{
|
|
$this->lines($lines, ">");
|
|
}
|
|
|
|
protected function deleted($lines)
|
|
{
|
|
$this->lines($lines, "<");
|
|
}
|
|
|
|
protected function changed($orig, $final)
|
|
{
|
|
$this->deleted($orig);
|
|
echo "---\n";
|
|
$this->added($final);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* "Unified" diff formatter.
|
|
*
|
|
* This class formats the diff in classic "unified diff" format.
|
|
*/
|
|
class UnifiedDiffFormatter extends DiffFormatter
|
|
{
|
|
function __construct($context_lines = 4)
|
|
{
|
|
$this->leading_context_lines = $context_lines;
|
|
$this->trailing_context_lines = $context_lines;
|
|
}
|
|
|
|
protected function block_header($xbeg, $xlen, $ybeg, $ylen)
|
|
{
|
|
if ($xlen != 1)
|
|
$xbeg .= "," . $xlen;
|
|
if ($ylen != 1)
|
|
$ybeg .= "," . $ylen;
|
|
return "@@ -$xbeg +$ybeg @@\n";
|
|
}
|
|
|
|
protected function added($lines)
|
|
{
|
|
$this->lines($lines, "+");
|
|
}
|
|
|
|
protected function deleted($lines)
|
|
{
|
|
$this->lines($lines, "-");
|
|
}
|
|
|
|
protected function changed($orig, $final)
|
|
{
|
|
$this->deleted($orig);
|
|
$this->added($final);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* block conflict diff formatter.
|
|
*
|
|
* This class will format a diff identical to Diff3 (i.e. editpage
|
|
* conflicts), but when there are only two source files. To be used by
|
|
* future enhancements to reloading / upgrading pgsrc.
|
|
*
|
|
* Functional but not finished yet, need to eliminate redundant block
|
|
* suffixes (i.e. "=======" immediately followed by another prefix)
|
|
* see class LoadFileConflictPageEditor
|
|
*/
|
|
class BlockDiffFormatter extends DiffFormatter
|
|
{
|
|
function __construct($context_lines = 4)
|
|
{
|
|
$this->leading_context_lines = $context_lines;
|
|
$this->trailing_context_lines = $context_lines;
|
|
}
|
|
|
|
protected function lines($lines, $prefix = '')
|
|
{
|
|
if (!$prefix == '')
|
|
echo "$prefix\n";
|
|
foreach ($lines as $line)
|
|
echo "$line\n";
|
|
if (!$prefix == '')
|
|
echo "$prefix\n";
|
|
}
|
|
|
|
protected function added($lines)
|
|
{
|
|
$this->lines($lines, ">>>>>>>");
|
|
}
|
|
|
|
protected function deleted($lines)
|
|
{
|
|
$this->lines($lines, "<<<<<<<");
|
|
}
|
|
|
|
protected function block_header($xbeg, $xlen, $ybeg, $ylen)
|
|
{
|
|
return "";
|
|
}
|
|
|
|
protected function changed($orig, $final)
|
|
{
|
|
$this->deleted($orig);
|
|
$this->added($final);
|
|
}
|
|
}
|