1163 lines
35 KiB
PHP
1163 lines
35 KiB
PHP
<?php
|
|
/**
|
|
* A PHP diff engine for phpwiki. (Taken from phpwiki-1.3.3)
|
|
*
|
|
* Additions by Axel Boldt for MediaWiki
|
|
*
|
|
* @copyright (C) 2000, 2001 Geoffrey T. Dairiki <dairiki@dairiki.org>
|
|
* @license You may copy this code freely under the conditions of the GPL.
|
|
*/
|
|
define('USE_ASSERTS', function_exists('assert'));
|
|
|
|
class _DiffOp {
|
|
var $type;
|
|
var $orig;
|
|
var $closing;
|
|
|
|
function reverse() {
|
|
trigger_error("pure virtual", E_USER_ERROR);
|
|
}
|
|
|
|
function norig() {
|
|
return $this->orig ? count($this->orig) : 0;
|
|
}
|
|
|
|
function nclosing() {
|
|
return $this->closing ? count($this->closing) : 0;
|
|
}
|
|
}
|
|
|
|
class _DiffOp_Copy extends _DiffOp {
|
|
var $type = 'copy';
|
|
|
|
function __construct($orig, $closing = false) {
|
|
if (!is_array($closing))
|
|
$closing = $orig;
|
|
$this->orig = $orig;
|
|
$this->closing = $closing;
|
|
}
|
|
|
|
function reverse() {
|
|
return new _DiffOp_Copy($this->closing, $this->orig);
|
|
}
|
|
}
|
|
|
|
class _DiffOp_Delete extends _DiffOp {
|
|
var $type = 'delete';
|
|
|
|
function __construct($lines) {
|
|
$this->orig = $lines;
|
|
$this->closing = false;
|
|
}
|
|
|
|
function reverse() {
|
|
return new _DiffOp_Add($this->orig);
|
|
}
|
|
}
|
|
|
|
class _DiffOp_Add extends _DiffOp {
|
|
var $type = 'add';
|
|
|
|
function __construct($lines) {
|
|
$this->closing = $lines;
|
|
$this->orig = false;
|
|
}
|
|
|
|
function reverse() {
|
|
return new _DiffOp_Delete($this->closing);
|
|
}
|
|
}
|
|
|
|
class _DiffOp_Change extends _DiffOp {
|
|
var $type = 'change';
|
|
|
|
function __construct($orig, $closing) {
|
|
$this->orig = $orig;
|
|
$this->closing = $closing;
|
|
}
|
|
|
|
function reverse() {
|
|
return new _DiffOp_Change($this->closing, $this->orig);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Class used internally by Diff to actually compute the diffs.
|
|
*
|
|
* The algorithm used here is mostly lifted from the perl module
|
|
* Algorithm::Diff (version 1.06) by Ned Konz, which is available at:
|
|
* http://www.perl.com/CPAN/authors/id/N/NE/NEDKONZ/Algorithm-Diff-1.06.zip
|
|
*
|
|
* More ideas are taken from:
|
|
* http://www.ics.uci.edu/~eppstein/161/960229.html
|
|
*
|
|
* Some ideas are (and a bit of code) are from from analyze.c, from GNU
|
|
* diffutils-2.7, which can be found at:
|
|
* ftp://gnudist.gnu.org/pub/gnu/diffutils/diffutils-2.7.tar.gz
|
|
*
|
|
* closingly, some ideas (subdivision by NCHUNKS > 2, and some optimizations)
|
|
* are my own.
|
|
*
|
|
* @author Geoffrey T. Dairiki
|
|
* @access private
|
|
*/
|
|
class _DiffEngine {
|
|
|
|
function diff($from_lines, $to_lines) {
|
|
$n_from = count($from_lines);
|
|
$n_to = count($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.
|
|
$this->_compareseq(0, count($this->xv), 0, count($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 < $n_to) {
|
|
USE_ASSERTS && assert($yi < $n_to || $this->xchanged[$xi]);
|
|
USE_ASSERTS && 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 $edits;
|
|
}
|
|
|
|
|
|
/**
|
|
* Divide the Largest Common Subsequence (LCS) of the sequences
|
|
* [XOFF, XLIM) and [YOFF, YLIM) into NCHUNKS approximately equally
|
|
* sized segments.
|
|
*
|
|
* Returns (LCS, PTS). LCS is the length of the LCS. PTS is an
|
|
* array of NCHUNKS+1 (X, Y) indexes giving the diving points between
|
|
* sub sequences. The first sub-sequence is contained in [X0, X1),
|
|
* [Y0, Y1), the second in [X1, X2), [Y1, Y2) and so on. Note
|
|
* that (X0, Y0) == (XOFF, YOFF) and
|
|
* (X[NCHUNKS], Y[NCHUNKS]) == (XLIM, YLIM).
|
|
*
|
|
* This function assumes that the first lines of the specified portions
|
|
* of the two files do not match, and likewise that the last lines do not
|
|
* match. The caller must trim matching lines from the beginning and end
|
|
* of the portions it is going to specify.
|
|
*/
|
|
function _diag($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($matches);
|
|
while (list ($junk, $y) = each($matches))
|
|
if (empty($this->in_seq[$y])) {
|
|
$k = $this->_lcs_pos($y);
|
|
USE_ASSERTS && assert($k > 0);
|
|
$ymids[$k] = $ymids[$k-1];
|
|
break;
|
|
}
|
|
while (list ($junk, $y) = each($matches)) {
|
|
if ($y > $this->seq[$k-1]) {
|
|
USE_ASSERTS && 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;
|
|
}
|
|
else if (empty($this->in_seq[$y])) {
|
|
$k = $this->_lcs_pos($y);
|
|
USE_ASSERTS && 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, $seps);
|
|
}
|
|
|
|
function _lcs_pos($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 = $mid;
|
|
}
|
|
|
|
USE_ASSERTS && assert($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 $this->{x,y}changed[], by
|
|
* storing a 1 in the element for each line that is an insertion
|
|
* or deletion (ie. is not in the LCS).
|
|
*
|
|
* The subsequence of file 0 is [XOFF, XLIM) and likewise for file 1.
|
|
*
|
|
* Note that XLIM, YLIM are exclusive bounds.
|
|
* All line numbers are origin-0 and discarded lines are not counted.
|
|
*/
|
|
function _compareseq($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 = $pt2;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Adjust inserts/deletes of identical lines to join changes
|
|
* as much as possible.
|
|
*
|
|
* We do something when a run of changed lines include a
|
|
* line at one end and has an excluded, identical line at the other.
|
|
* We are free to choose which identical line is included.
|
|
* `compareseq' usually chooses the one at the beginning,
|
|
* but usually it is cleaner to consider the following identical line
|
|
* to be the "change".
|
|
*
|
|
* This is extracted verbatim from analyze.c (GNU diffutils-2.7).
|
|
*/
|
|
function _shift_boundaries($lines, &$changed, $other_changed) {
|
|
$i = 0;
|
|
$j = 0;
|
|
|
|
USE_ASSERTS && assert('count($lines) == count($changed)');
|
|
$len = count($lines);
|
|
$other_len = count($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]) {
|
|
USE_ASSERTS && 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])
|
|
$start--;
|
|
USE_ASSERTS && assert('$j > 0');
|
|
while ($other_changed[--$j])
|
|
continue;
|
|
USE_ASSERTS && 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])
|
|
$i++;
|
|
|
|
USE_ASSERTS && assert('$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;
|
|
USE_ASSERTS && assert('$j > 0');
|
|
while ($other_changed[--$j])
|
|
continue;
|
|
USE_ASSERTS && assert('$j >= 0 && !$other_changed[$j]');
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Class representing a 'diff' between two sequences of strings.
|
|
*/
|
|
class Diff {
|
|
|
|
var $edits;
|
|
|
|
/**
|
|
* Constructor.
|
|
* 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, $to_lines);
|
|
//$this->_check($from_lines, $to_lines);
|
|
}
|
|
|
|
/**
|
|
* Compute reversed Diff.
|
|
*
|
|
* SYNOPSIS:
|
|
*
|
|
* $diff = new Diff($lines1, $lines2);
|
|
* $rev = $diff->reverse();
|
|
* @return object A Diff object representing the inverse of the
|
|
* original diff.
|
|
*/
|
|
function reverse() {
|
|
$rev = $this;
|
|
$rev->edits = array();
|
|
foreach ($this->edits as $edit) {
|
|
$rev->edits[] = $edit->reverse();
|
|
}
|
|
return $rev;
|
|
}
|
|
|
|
/**
|
|
* Check for empty diff.
|
|
*
|
|
* @return bool True iff two sequences were identical.
|
|
*/
|
|
function isEmpty() {
|
|
foreach ($this->edits as $edit) {
|
|
if ($edit->type != 'copy')
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Compute the length of the Longest Common Subsequence (LCS).
|
|
*
|
|
* This is mostly for diagnostic purposed.
|
|
*
|
|
* @return int The length of the LCS.
|
|
*/
|
|
function lcs() {
|
|
$lcs = 0;
|
|
foreach ($this->edits as $edit) {
|
|
if ($edit->type == 'copy')
|
|
$lcs += count($edit->orig);
|
|
}
|
|
return $lcs;
|
|
}
|
|
|
|
/**
|
|
* Get the original set of lines.
|
|
*
|
|
* This reconstructs the $from_lines parameter passed to the
|
|
* constructor.
|
|
*
|
|
* @return array The original sequence of strings.
|
|
*/
|
|
function orig() {
|
|
$lines = array();
|
|
|
|
foreach ($this->edits as $edit) {
|
|
if ($edit->orig)
|
|
array_splice($lines, count($lines), 0, $edit->orig);
|
|
}
|
|
return $lines;
|
|
}
|
|
|
|
/**
|
|
* Get the closing set of lines.
|
|
*
|
|
* This reconstructs the $to_lines parameter passed to the
|
|
* constructor.
|
|
*
|
|
* @return array The sequence of strings.
|
|
*/
|
|
function closing() {
|
|
$lines = array();
|
|
|
|
foreach ($this->edits as $edit) {
|
|
if ($edit->closing)
|
|
array_splice($lines, count($lines), 0, $edit->closing);
|
|
}
|
|
return $lines;
|
|
}
|
|
|
|
/**
|
|
* Check a Diff for validity.
|
|
*
|
|
* This is here only for debugging purposes.
|
|
*/
|
|
function _check($from_lines, $to_lines) {
|
|
if (serialize($from_lines) != serialize($this->orig()))
|
|
trigger_error("Reconstructed original doesn't match", E_USER_ERROR);
|
|
if (serialize($to_lines) != serialize($this->closing()))
|
|
trigger_error("Reconstructed closing doesn't match", E_USER_ERROR);
|
|
|
|
$rev = $this->reverse();
|
|
if (serialize($to_lines) != serialize($rev->orig()))
|
|
trigger_error("Reversed original doesn't match", E_USER_ERROR);
|
|
if (serialize($from_lines) != serialize($rev->closing()))
|
|
trigger_error("Reversed closing doesn't match", E_USER_ERROR);
|
|
|
|
$prevtype = 'none';
|
|
foreach ($this->edits as $edit) {
|
|
if ($prevtype == $edit->type)
|
|
trigger_error("Edit sequence is non-optimal", E_USER_ERROR);
|
|
$prevtype = $edit->type;
|
|
}
|
|
|
|
$lcs = $this->lcs();
|
|
trigger_error("Diff okay: LCS = $lcs", E_USER_NOTICE);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* FIXME: bad name.
|
|
*/
|
|
class MappedDiff extends Diff {
|
|
/**
|
|
* Constructor.
|
|
*
|
|
* 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, $mapped_to_lines) {
|
|
|
|
assert(count($from_lines) == count($mapped_from_lines));
|
|
assert(count($to_lines) == count($mapped_to_lines));
|
|
|
|
parent::__construct($mapped_from_lines, $mapped_to_lines);
|
|
|
|
$xi = $yi = 0;
|
|
$ecnt = count($this->edits);
|
|
for ($i = 0; $i < $ecnt; $i++) {
|
|
$orig = &$this->edits[$i]->orig;
|
|
if (is_array($orig)) {
|
|
$orig = array_slice($from_lines, $xi, count($orig));
|
|
$xi += count($orig);
|
|
}
|
|
|
|
$closing = &$this->edits[$i]->closing;
|
|
if (is_array($closing)) {
|
|
$closing = array_slice($to_lines, $yi, count($closing));
|
|
$yi += count($closing);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
var $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.
|
|
*/
|
|
var $trailing_context_lines = 0;
|
|
|
|
/**
|
|
* Format a diff.
|
|
*
|
|
* @param $diff object A Diff object.
|
|
* @return string The formatted output.
|
|
*/
|
|
function format($diff) {
|
|
|
|
$xi = $yi = 1;
|
|
$block = false;
|
|
$context = array();
|
|
|
|
$nlead = $this->leading_context_lines;
|
|
$ntrail = $this->trailing_context_lines;
|
|
|
|
$this->_start_diff();
|
|
|
|
foreach ($diff->edits as $edit) {
|
|
if ($edit->type == 'copy') {
|
|
if (is_array($block)) {
|
|
if (count($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, count($context) - $nlead);
|
|
$x0 = $xi - count($context);
|
|
$y0 = $yi - count($context);
|
|
$block = array();
|
|
if ($context)
|
|
$block[] = new _DiffOp_Copy($context);
|
|
}
|
|
$block[] = $edit;
|
|
}
|
|
|
|
if ($edit->orig)
|
|
$xi += count($edit->orig);
|
|
if ($edit->closing)
|
|
$yi += count($edit->closing);
|
|
}
|
|
|
|
if (is_array($block))
|
|
$this->_block($x0, $xi - $x0, $y0, $yi - $y0, $block);
|
|
|
|
return $this->_end_diff();
|
|
}
|
|
|
|
function _block($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->closing);
|
|
elseif ($edit->type == 'delete')
|
|
$this->_deleted($edit->orig);
|
|
elseif ($edit->type == 'change')
|
|
$this->_changed($edit->orig, $edit->closing);
|
|
else
|
|
trigger_error("Unknown edit type", E_USER_ERROR);
|
|
}
|
|
$this->_end_block();
|
|
}
|
|
|
|
function _start_diff() {
|
|
ob_start();
|
|
}
|
|
|
|
function _end_diff() {
|
|
$val = ob_get_contents();
|
|
ob_end_clean();
|
|
return $val;
|
|
}
|
|
|
|
function _block_header($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') . $ybeg;
|
|
}
|
|
|
|
function _start_block($header) {
|
|
echo $header;
|
|
}
|
|
|
|
function _end_block() {
|
|
}
|
|
|
|
function _lines($lines, $prefix = ' ') {
|
|
foreach ($lines as $line)
|
|
echo "$prefix $line\n";
|
|
}
|
|
|
|
function _context($lines) {
|
|
$this->_lines($lines);
|
|
}
|
|
|
|
function _added($lines) {
|
|
$this->_lines($lines, ">");
|
|
}
|
|
function _deleted($lines) {
|
|
$this->_lines($lines, "<");
|
|
}
|
|
|
|
function _changed($orig, $closing) {
|
|
$this->_deleted($orig);
|
|
echo "---\n";
|
|
$this->_added($closing);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Additions by Axel Boldt follow, partly taken from diff.php, phpwiki-1.3.3
|
|
*
|
|
*/
|
|
|
|
define('NBSP', "\xC2\xA0"); // utf-8 non-breaking space.
|
|
|
|
class _HWLDF_WordAccumulator {
|
|
|
|
function __construct() {
|
|
$this->_lines = array();
|
|
$this->_line = '';
|
|
$this->_group = '';
|
|
$this->_tag = '';
|
|
}
|
|
|
|
function _flushGroup($new_tag) {
|
|
if ($this->_group !== '') {
|
|
if ($this->_tag == 'mark')
|
|
$this->_line .= '<strong>'.$this->_group.'</strong>';
|
|
elseif ($this->_tag == 'add')
|
|
$this->_line .= '<span class="diff-addedline">'.$this->_group.'</span>';
|
|
elseif ($this->_tag == 'del')
|
|
$this->_line .= '<span class="diff-deletedline"><del>'.$this->_group.'</del></span>';
|
|
else
|
|
$this->_line .= $this->_group;
|
|
}
|
|
$this->_group = '';
|
|
$this->_tag = $new_tag;
|
|
}
|
|
|
|
function _flushLine($new_tag) {
|
|
$this->_flushGroup($new_tag);
|
|
if ($this->_line != '')
|
|
$this->_lines[] = $this->_line;
|
|
$this->_line = '';
|
|
}
|
|
|
|
function addWords($words, $tag = '') {
|
|
if ($tag != $this->_tag)
|
|
$this->_flushGroup($tag);
|
|
|
|
foreach ($words as $word) {
|
|
// new-line should only come as first char of word.
|
|
if ($word == '')
|
|
continue;
|
|
if ($word[0] == "\n") {
|
|
$this->_group .= NBSP;
|
|
$this->_flushLine($tag);
|
|
$word = substr($word, 1);
|
|
}
|
|
assert(!strstr($word, "\n"));
|
|
$this->_group .= $word;
|
|
}
|
|
}
|
|
|
|
function getLines() {
|
|
$this->_flushLine('~done');
|
|
return $this->_lines;
|
|
}
|
|
}
|
|
|
|
class WordLevelDiff extends MappedDiff {
|
|
|
|
function __construct($orig_lines, $closing_lines) {
|
|
list ($orig_words, $orig_stripped) = $this->_split($orig_lines);
|
|
list ($closing_words, $closing_stripped) = $this->_split($closing_lines);
|
|
|
|
parent::__construct($orig_words, $closing_words, $orig_stripped, $closing_stripped);
|
|
}
|
|
|
|
function _split($lines) {
|
|
if (!preg_match_all('/ ( [^\S\n]+ | [0-9_A-Za-z\x80-\xff]+ | . ) (?: (?!< \n) [^\S\n])? /xsu',
|
|
implode("\n", $lines), $m)) {
|
|
return array(array(''), array(''));
|
|
}
|
|
return array($m[0], $m[1]);
|
|
}
|
|
|
|
function orig() {
|
|
$orig = new _HWLDF_WordAccumulator;
|
|
|
|
foreach ($this->edits as $edit) {
|
|
if ($edit->type == 'copy')
|
|
$orig->addWords($edit->orig);
|
|
elseif ($edit->orig)
|
|
$orig->addWords($edit->orig, 'mark');
|
|
}
|
|
return $orig->getLines();
|
|
}
|
|
|
|
function closing() {
|
|
$closing = new _HWLDF_WordAccumulator;
|
|
|
|
foreach ($this->edits as $edit) {
|
|
if ($edit->type == 'copy')
|
|
$closing->addWords($edit->closing);
|
|
elseif ($edit->closing)
|
|
$closing->addWords($edit->closing, 'mark');
|
|
}
|
|
return $closing->getLines();
|
|
}
|
|
}
|
|
|
|
class InlineWordLevelDiff extends MappedDiff {
|
|
|
|
function __construct($orig_lines, $closing_lines) {
|
|
list ($orig_words, $orig_stripped) = $this->_split($orig_lines);
|
|
list ($closing_words, $closing_stripped) = $this->_split($closing_lines);
|
|
|
|
parent::__construct($orig_words, $closing_words, $orig_stripped, $closing_stripped);
|
|
}
|
|
|
|
function _split($lines) {
|
|
if (!preg_match_all('/ ( [^\S\n]+ | [0-9_A-Za-z\x80-\xff]+ | . ) (?: (?!< \n) [^\S\n])? /xsu',
|
|
implode("\n", $lines), $m)) {
|
|
return array(array(''), array(''));
|
|
}
|
|
return array($m[0], $m[1]);
|
|
}
|
|
|
|
function inline() {
|
|
$orig = new _HWLDF_WordAccumulator;
|
|
foreach ($this->edits as $edit) {
|
|
if ($edit->type == 'copy')
|
|
$orig->addWords($edit->closing);
|
|
elseif ($edit->type == 'change'){
|
|
$orig->addWords($edit->orig, 'del');
|
|
$orig->addWords($edit->closing, 'add');
|
|
} elseif ($edit->type == 'delete')
|
|
$orig->addWords($edit->orig, 'del');
|
|
elseif ($edit->type == 'add')
|
|
$orig->addWords($edit->closing, 'add');
|
|
elseif ($edit->orig)
|
|
$orig->addWords($edit->orig, 'del');
|
|
}
|
|
return $orig->getLines();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* "Unified" diff formatter.
|
|
*
|
|
* This class formats the diff in classic "unified diff" format.
|
|
*/
|
|
class UnifiedDiffFormatter extends DiffFormatter {
|
|
|
|
function __construct($context_lines = 4) {
|
|
$this->leading_context_lines = $context_lines;
|
|
$this->trailing_context_lines = $context_lines;
|
|
}
|
|
|
|
function _block_header($xbeg, $xlen, $ybeg, $ylen) {
|
|
if ($xlen != 1)
|
|
$xbeg .= "," . $xlen;
|
|
if ($ylen != 1)
|
|
$ybeg .= "," . $ylen;
|
|
return "@@ -$xbeg +$ybeg @@\n";
|
|
}
|
|
|
|
function _added($lines) {
|
|
$this->_lines($lines, "+");
|
|
}
|
|
function _deleted($lines) {
|
|
$this->_lines($lines, "-");
|
|
}
|
|
function _changed($orig, $final) {
|
|
$this->_deleted($orig);
|
|
$this->_added($final);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Wikipedia Table style diff formatter.
|
|
*
|
|
*/
|
|
class TableDiffFormatter extends DiffFormatter {
|
|
|
|
function __construct() {
|
|
$this->leading_context_lines = 2;
|
|
$this->trailing_context_lines = 2;
|
|
}
|
|
|
|
function format($diff) {
|
|
// Preserve whitespaces by converting some to non-breaking spaces.
|
|
// Do not convert all of them to allow word-wrap.
|
|
$val = parent::format($diff);
|
|
$val = str_replace(' ',' ', $val);
|
|
$val = preg_replace('/ (?=<)|(?<=[ >]) /', ' ', $val);
|
|
return $val;
|
|
}
|
|
|
|
function _pre($text){
|
|
$text = htmlspecialchars($text);
|
|
return $text;
|
|
}
|
|
|
|
function _block_header($xbeg, $xlen, $ybeg, $ylen) {
|
|
global $lang;
|
|
$l1 = $lang['line'].' '.$xbeg;
|
|
$l2 = $lang['line'].' '.$ybeg;
|
|
$r = '<tr><td class="diff-blockheader" colspan="2">'.$l1.":</td>\n".
|
|
'<td class="diff-blockheader" colspan="2">'.$l2.":</td>\n".
|
|
"</tr>\n";
|
|
return $r;
|
|
}
|
|
|
|
function _start_block($header) {
|
|
print($header);
|
|
}
|
|
|
|
function _end_block() {
|
|
}
|
|
|
|
function _lines($lines, $prefix=' ', $color="white") {
|
|
}
|
|
|
|
function addedLine($line) {
|
|
return '<td>+</td><td class="diff-addedline">' . $line.'</td>';
|
|
}
|
|
|
|
function deletedLine($line) {
|
|
return '<td>-</td><td class="diff-deletedline">' . $line.'</td>';
|
|
}
|
|
|
|
function emptyLine() {
|
|
return '<td colspan="2"> </td>';
|
|
}
|
|
|
|
function contextLine($line) {
|
|
return '<td> </td><td class="diff-context">'.$line.'</td>';
|
|
}
|
|
|
|
function _added($lines) {
|
|
foreach ($lines as $line) {
|
|
print('<tr>' . $this->emptyLine() . $this->addedLine($line) . "</tr>\n");
|
|
}
|
|
}
|
|
|
|
function _deleted($lines) {
|
|
foreach ($lines as $line) {
|
|
print('<tr>' . $this->deletedLine($line) . $this->emptyLine() . "</tr>\n");
|
|
}
|
|
}
|
|
|
|
function _context($lines) {
|
|
foreach ($lines as $line) {
|
|
print('<tr>' . $this->contextLine($line) . $this->contextLine($line) . "</tr>\n");
|
|
}
|
|
}
|
|
|
|
function _changed($orig, $closing) {
|
|
$diff = new WordLevelDiff($orig, $closing);
|
|
$del = $diff->orig();
|
|
$add = $diff->closing();
|
|
|
|
while ($line = array_shift($del)) {
|
|
$aline = array_shift($add);
|
|
print('<tr>' . $this->deletedLine($line) . $this->addedLine($aline) . "</tr>\n");
|
|
}
|
|
$this->_added($add); # If any leftovers
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Inline style diff formatter.
|
|
*
|
|
*/
|
|
class InlineDiffFormatter extends DiffFormatter {
|
|
var $colspan = 4;
|
|
|
|
function __construct() {
|
|
$this->leading_context_lines = 2;
|
|
$this->trailing_context_lines = 2;
|
|
}
|
|
|
|
function format($diff) {
|
|
// Preserve whitespaces by converting some to non-breaking spaces.
|
|
// Do not convert all of them to allow word-wrap.
|
|
$val = parent::format($diff);
|
|
$val = str_replace(' ',' ', $val);
|
|
$val = preg_replace('/ (?=<)|(?<=[ >]) /', ' ', $val);
|
|
return $val;
|
|
}
|
|
|
|
function _pre($text){
|
|
$text = htmlspecialchars($text);
|
|
return $text;
|
|
}
|
|
|
|
function _block_header($xbeg, $xlen, $ybeg, $ylen) {
|
|
global $lang;
|
|
if ($xlen != 1)
|
|
$xbeg .= "," . $xlen;
|
|
if ($ylen != 1)
|
|
$ybeg .= "," . $ylen;
|
|
$r = '<tr><td colspan="'.$this->colspan.'" class="diff-blockheader">@@ '.$lang['line']." -$xbeg +$ybeg @@";
|
|
$r .= ' <span class="diff-deletedline"><del>'.$lang['deleted'].'</del></span>';
|
|
$r .= ' <span class="diff-addedline">'.$lang['created'].'</span>';
|
|
$r .= "</td></tr>\n";
|
|
return $r;
|
|
}
|
|
|
|
function _start_block($header) {
|
|
print($header."\n");
|
|
}
|
|
|
|
function _end_block() {
|
|
}
|
|
|
|
function _lines($lines, $prefix=' ', $color="white") {
|
|
}
|
|
|
|
function _added($lines) {
|
|
foreach ($lines as $line) {
|
|
print('<tr><td colspan="'.$this->colspan.'" class="diff-addedline">'. $line . "</td></tr>\n");
|
|
}
|
|
}
|
|
|
|
function _deleted($lines) {
|
|
foreach ($lines as $line) {
|
|
print('<tr><td colspan="'.$this->colspan.'" class="diff-deletedline"><del>' . $line . "</del></td></tr>\n");
|
|
}
|
|
}
|
|
|
|
function _context($lines) {
|
|
foreach ($lines as $line) {
|
|
print('<tr><td colspan="'.$this->colspan.'" class="diff-context">'.$line."</td></tr>\n");
|
|
}
|
|
}
|
|
|
|
function _changed($orig, $closing) {
|
|
$diff = new InlineWordLevelDiff($orig, $closing);
|
|
$add = $diff->inline();
|
|
|
|
foreach ($add as $line)
|
|
print('<tr><td colspan="'.$this->colspan.'">'.$line."</td></tr>\n");
|
|
}
|
|
}
|
|
|
|
|
|
//Setup VIM: ex: et ts=4 :
|