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viewdiff-ex.php
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<style type="text/css">
body {
margin: 0;
border: 0;
padding: 0;
font-size: 11pt;
}
body > h1 {
margin:0 0 0.5em 0;
font: 2em sans-serif;
background-color: #def
}
body > div {
padding:2px;
}
p {
margin-top: 0;
}
ins {
color: green;
background: #dfd;
text-decoration: none;
}
del {
color: red;
background: #fdd;
text-decoration: none;
}
code {
font-size: smaller;
}
#params {
margin: 1em 0;
font: 14px sans-serif;
}
.code {
margin-left: 2em;
font: 12px monospace;
}
.ins {
background:#dfd;
}
.del {
background:#fdd;
}
.rep {
color: #008;
background: #eef;
}
.panecontainer {
display: inline-block;
width: 49.5%;
vertical-align: top;
}
.panecontainer > p {
margin: 0;
border: 1px solid #bcd;
border-bottom: none;
padding: 1px 3px;
background: #def;
font: 14px sans-serif
}
.panecontainer > p + div {
margin: 0;
padding: 2px 0 2px 2px;
border: 1px solid #bcd;
border-top: none;
}
.pane {
margin: 0;
padding: 0;
border: 0;
width: 100%;
min-height: 20em;
overflow:auto;
font: 12px monospace;
}
#htmldiff.onlyDeletions ins {display:none}
#htmldiff.onlyInsertions del {display:none}
</style>
<title>PHP Fine Diff</title>
<script type="text/javascript">
var _gaq = _gaq || [];
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s.parentNode.insertBefore(ga, s);
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</script>
</head>
<body>
<a href="https://github.com/gorhill/PHP-FineDiff"><img style="position:absolute;top:0;right:0;border:0;" src="https://d3nwyuy0nl342s.cloudfront.net/img/7afbc8b248c68eb468279e8c17986ad46549fb71/687474703a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f6461726b626c75655f3132313632312e706e67" alt="Fork me on GitHub"></a>
<h1>PHP Fine Diff</h1>
<div>
<p style="margin-right:5em">This page demonstrate the <a href="finediff-code.php"><code>FineDiff</code></a> class (as in “<b>fine</b> granularity <b>diff</b>”) I wrote – starting from scratch – to generate a <u>lossless</u> (won't eat your line breaks), <u>compact</u> opcodes string listing the sequence of atomic actions (copy/delete/insert) necessary to transform one string into another (thereafter referred as the “From” and “To” string). The “To” string can be rebuilt by running the opcodes string on the “From” string. The <code>FineDiff</code> class allows to specify the granularity, and up to character-level granularity is possible, in order to generate the smallest diff possible (at the <i>potential</i> cost of increased CPU cycles.)</p>
<p>Typical usage:</p>
<p class="code">
include '<a href="finediff-code.php">finediff.php</a>';<br>
$opcodes = FineDiff::getDiffOpcodes($from_text, $to_text /* , default granularity is set to character */);<br>
// store opcodes for later use...</p>
<p>Later, <code>$to_text</code> can be re-created from <code>$from_text</code> using <code>$opcodes</code> as follow:</p>
<p class="code">
include '<a href="finediff-code.php">finediff.php</a>';<br>
$to_text = FineDiff::renderToTextFromOpcodes($from_text, $opcodes);
</p>
<p>Try it by inserting your own text, or <a href="viewdiff-ex?sample=1">Use sample text</a>, or <a href="viewdiff-ex">Start from scratch</a>, or just use the plain <a href="viewdiff.php">Online diff viewer</a>:</p>
<?php
// http://www.php.net/manual/en/function.get-magic-quotes-gpc.php#82524
function stripslashes_deep(&$value) {
$value = is_array($value) ? array_map('stripslashes_deep', $value) : stripslashes($value);
return $value;
}
if ( (function_exists("get_magic_quotes_gpc") && get_magic_quotes_gpc()) || (ini_get('magic_quotes_sybase') && strtolower(ini_get('magic_quotes_sybase'))!="off") ) {
stripslashes_deep($_GET);
stripslashes_deep($_POST);
stripslashes_deep($_REQUEST);
}
require_once 'finediff.php';
$from = '';
$to = '';
$granularity = 2;
if ( isset($_REQUEST['granularity']) && ctype_digit($_REQUEST['granularity']) ) {
$granularity = max(min(intval($_REQUEST['granularity']),3),0);
}
$rendered_diff = '';
if ( !empty($_REQUEST['from']) || !empty($_REQUEST['to'])) {
if ( !empty($_REQUEST['from']) ) {
$from = $_REQUEST['from'];
}
if ( !empty($_REQUEST['to']) ) {
$to = $_REQUEST['to'];
}
}
else if ( !empty($_REQUEST['sample']) ) { // use sample text?
// Sample text:
// http://en.wikipedia.org/w/index.php?title=Universe&action=historysubmit&diff=414830579&oldid=378547111
$from = file_get_contents('sample_from.txt');
$to = file_get_contents('sample_to.txt');
}
$from_len = strlen($from);
$to_len = strlen($to);
$use_stdlib_diff = !empty($_REQUEST['stdlib']) && ctype_digit($_REQUEST['stdlib']) && intval($_REQUEST['stdlib']) === 1;
require_once 'Text/Diff.php';
$start_time = gettimeofday(true);
if ( $use_stdlib_diff ) {
if ( $granularity < 3 ) {
$delimiters = array(
FineDiff::paragraphDelimiters,
FineDiff::sentenceDelimiters,
FineDiff::wordDelimiters,
FineDiff::characterDelimiters
);
function extractFragments($text, $delimiter) {
$text = str_replace(array("\n","\r"), array("\1","\2"), $text);
$delimiter = str_replace(array("\n","\r"), array("\1","\2"), $delimiter);
if ( empty($delimiter) ) {
return str_split($text, 1);
}
$fragments = array();
$start = $end = 0;
for (;;) {
$end += strcspn($text, $delimiter, $end);
$end += strspn($text, $delimiter, $end);
if ( $end === $start ) {
break;
}
$fragments[] = substr($text, $start, $end - $start);
$start = $end;
}
return $fragments;
}
$from_fragments = extractFragments($from, $delimiters[$granularity]);
$to_fragments = extractFragments($to, $delimiters[$granularity]);
$diff = new Text_Diff('native', array($from_fragments, $to_fragments));
$exec_time = sprintf('%.3f sec', gettimeofday(true) - $start_time);
$edits = array();
ob_start();
foreach ( $diff->getDiff() as $edit ) {
if ( $edit instanceof Text_Diff_Op_copy ) {
$orig = str_replace(array("\1","\2"), array("\n","\r"), implode('', $edit->orig));
$edits[] = new fineDiffCopyOp(strlen($orig));
echo htmlentities($orig);
}
else if ( $edit instanceof Text_Diff_Op_delete ) {
$orig = str_replace(array("\1","\2"), array("\n","\r"), implode('', $edit->orig));
$edits[] = new fineDiffDeleteOp(strlen($orig));
echo '<del>', htmlentities($orig), '</del>';
}
else if ( $edit instanceof Text_Diff_Op_add ) {
$final = str_replace(array("\1","\2"), array("\n","\r"), implode('', $edit->final));
$edits[] = new fineDiffInsertOp($final);
echo '<ins>', htmlentities($final), '</ins>';
}
else if ( $edit instanceof Text_Diff_Op_change ) {
$orig = str_replace(array("\1","\2"), array("\n","\r"), implode('', $edit->orig));
$final = str_replace(array("\1","\2"), array("\n","\r"), implode('', $edit->final));
$edits[] = new fineDiffReplaceOp(strlen($orig), $final);
echo '<del>', htmlentities($orig), '</del>';
echo '<ins>', htmlentities($final), '</ins>';
}
}
$rendered_diff = ob_get_clean();
$rendering_time = sprintf('%.3f sec', gettimeofday(true) - $start_time);
}
// character-level granularity not allowed
else {
$edits = false;
$exec_time = '?';
$rendering_time = '?';
$rendered_diff = '<span style="color:gray">Character-level granularity not allowed when using <code>Text_Diff</code>, due to performance issues.</span>';
}
}
else {
$granularityStacks = array(
FineDiff::$paragraphGranularity,
FineDiff::$sentenceGranularity,
FineDiff::$wordGranularity,
FineDiff::$characterGranularity
);
$diff = new FineDiff($from, $to, $granularityStacks[$granularity]);
$edits = $diff->getOps();
$exec_time = sprintf('%.3f sec', gettimeofday(true) - $start_time);
$rendered_diff = $diff->renderDiffToHTML();
$rendering_time = sprintf('%.3f sec', gettimeofday(true) - $start_time);
}
if ( $edits !== false ) {
$opcodes = array();
$opcodes_len = 0;
foreach ( $edits as $edit ) {
$opcode = $edit->getOpcode();
$opcodes_len += strlen($opcode);
$opcode = htmlentities($opcode);
if ( $edit instanceof FineDiffCopyOp ) {
$opcodes[] = "{$opcode}";
}
else if ( $edit instanceof FineDiffDeleteOp ) {
$opcodes[] = "<span class=\"del\">{$opcode}</span>";
}
else if ( $edit instanceof FineDiffInsertOp ) {
$opcodes[] = "<span class=\"ins\">{$opcode}</span>";
}
else /* if ( $edit instanceof FineDiffReplaceOp ) */ {
$opcodes[] = "<span class=\"rep\">{$opcode}</span>";
}
}
$opcodes = implode("", $opcodes);
$opcodes_len = sprintf('%d bytes (%.1f %% of "To")', $opcodes_len, $to_len ? $opcodes_len * 100 / $to_len : 0);
}
else {
$opcodes = '?';
$opcodes_len = '?';
}
?>
<form action="viewdiff-ex.php" method="post">
<div class="panecontainer"><p>From:</p><div><textarea name="from" class="pane"><?php echo htmlentities($from); ?></textarea></div></div>
<div class="panecontainer"><p>To:</p><div><textarea name="to" class="pane"><?php echo htmlentities($to); ?></textarea></div></div>
<p id="params">Granularity:<input name="granularity" type="radio" value="0"<?php if ( $granularity === 0 ) { echo ' checked="checked"'; } ?>> Paragraph/lines <input name="granularity" type="radio" value="1"<?php if ( $granularity === 1 ) { echo ' checked="checked"'; } ?>> Sentence <input name="granularity" type="radio" value="2"<?php if ( $granularity === 2 ) { echo ' checked="checked"'; } ?>> Word <input name="granularity" type="radio" value="3"<?php if ( $granularity === 3 ) { echo ' checked="checked"'; } ?>> Character <!-- <input name="XDEBUG_PROFILE" type="hidden" value=""> --><input type="submit" value="Compute diff"> <input name="stdlib" type="checkbox" value="1"<?php if ( $use_stdlib_diff ) { echo ' checked="checked"'; } ?>><a href="http://pear.php.net/package/Text_Diff/"><code>Text_Diff</code></a> lib (for comparison purpose) <sup style="font-size:x-small"><a href="#notes">see notes</a></sup></p>
</form>
<div class="panecontainer"><p>Diff stats:</p><div><div class="pane">
<b>Diff execution time:</b> <?php echo $exec_time; ?><br>
<b>Diff execution + rendering time:</b> <?php echo $rendering_time; ?><br>
<b>"From" size:</b> <?php echo $from_len; ?> bytes<br>
<b>"To" size:</b> <?php echo $to_len; ?> bytes<br>
<b>Diff opcodes size:</b> <?php echo $opcodes_len; ?><br>
<b>Diff opcodes (<span style="border:1px solid #ccc;display:inline-block;width:16px"> </span>=copy, <span class="del" style="display:inline-block;width:16px"> </span>=delete, <span class="ins" style="display:inline-block;width:16px"> </span>=insert, <span class="rep" style="display:inline-block;width:16px"> </span>=replace):</b>
<div style="margin:2px 0 2px 0;border:0;border-top:1px dotted #aaa;padding-top:4px;word-wrap:break-word"><?php echo $opcodes; ?></div>
</div></div></div>
<div class="panecontainer"><p>Rendered Diff: <span style="font-size:smaller">Show <input type="radio" name="htmldiffshow" onclick="setHTMLDiffVisibility('deletions');">Deletions only <input type="radio" name="htmldiffshow" checked="checked" onclick="setHTMLDiffVisibility();">All <input type="radio" name="htmldiffshow" onclick="setHTMLDiffVisibility('insertions');">Insertions only</span></p>
<div id="htmldiff">
<div class="pane" style="white-space:pre-line"><?php echo $rendered_diff; ?></div>
</div>
</div>
<script type="text/javascript">
<!--
function setHTMLDiffVisibility(what) {
var htmldiffEl = document.getElementById('htmldiff');
if ( what === 'deletions' ) {
htmldiffEl.className = 'onlyDeletions';
}
else if ( what === 'insertions' ) {
htmldiffEl.className = 'onlyInsertions';
}
else {
htmldiffEl.className = '';
}
}
// -->
</script>
</div>
<div style="margin:0.5em 0;border-top:1px solid #ccc;height:2px"></div>
<div id="notes" style="font:11px sans-serif"><h3 style="margin-top:0">Notes</h3>
<p>The PHP-based engine of <code><a href="http://pear.php.net/package/Text_Diff/">Text_Diff</a></code> is forced, in order to meaningfully compare results with PHP-based <code>FineDiff</code>. <code>Text_Diff</code> is naturally geared toward line-level granularity, and to compute diff for a higher granularity (sequences, words, characters), line break characters (\n, \r) are replaced in order to avoid having <code>Text_Diff</code> from eating our line breaks — so extra steps are required.</p>
<p><code>FineDiff</code> is natively better equipped to generate diff at granularity higher than line levels. An example of this is that using the above built-in sample text, for word and character-level granularity, <code>FineDiff</code> roughly executes in 25 ms and 30 ms, respectively, while <code>Text_Diff</code> roughly executes in 75 ms and 6.5 seconds, respectively (on my development computer, a run of the mill Intel i5 core desktop computer).</p>
<p>If you wish to comment on this page, head to the associated blog entry: <a href="http://www.raymondhill.net/blog/?p=441">FineDiff, a character-level diff algorithm in PHP</a></p>
</div>
</body>
</html>