DiffFormatter.php
Same filename in this branch
Same filename in other branches
Namespace
Drupal\Component\DiffFile
-
core/
lib/ Drupal/ Component/ Diff/ DiffFormatter.php
View source
<?php
namespace Drupal\Component\Diff;
use Drupal\Component\Diff\Engine\DiffOpCopy;
/**
* 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.
* @todo document
* @private
* @subpackage DifferenceEngine
*/
class DiffFormatter {
/**
* Should a block header be shown?
*/
public $show_header = TRUE;
/**
* 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;
/**
* The line stats.
*
* @var array
*/
protected $line_stats = [
'counter' => [
'x' => 0,
'y' => 0,
],
'offset' => [
'x' => 0,
'y' => 0,
],
];
/**
* Format a diff.
*
* @param \Drupal\Component\Diff\Diff $diff
* A Diff object.
*
* @return string
* The formatted output.
*/
public function format(Diff $diff) {
$xi = $yi = 1;
$block = FALSE;
$context = [];
$nlead = $this->leading_context_lines;
$ntrail = $this->trailing_context_lines;
$this->_start_diff();
foreach ($diff->getEdits() 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);
$block[] = new DiffOpCopy($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, sizeof($context) - $nlead);
$x0 = $xi - sizeof($context);
$y0 = $yi - sizeof($context);
$block = [];
if ($context) {
$block[] = new DiffOpCopy($context);
}
}
$block[] = $edit;
}
if ($edit->orig) {
$xi += sizeof($edit->orig);
}
if ($edit->closing) {
$yi += sizeof($edit->closing);
}
}
if (is_array($block)) {
$this->_block($x0, $xi - $x0, $y0, $yi - $y0, $block);
}
$end = $this->_end_diff();
if (!empty($xi)) {
$this->line_stats['counter']['x'] += $xi;
}
if (!empty($yi)) {
$this->line_stats['counter']['y'] += $yi;
}
return $end;
}
protected function _block($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_WARNING);
}
}
$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) {
if ($this->show_header) {
echo $header . "\n";
}
}
protected function _end_block() {
}
protected function _lines($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, $closing) {
$this->_deleted($orig);
echo "---\n";
$this->_added($closing);
}
}
Classes
Title | Deprecated | Summary |
---|---|---|
DiffFormatter | A class to format Diffs |
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