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Copy pathHtml2Text.php
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328 lines (281 loc) · 8.21 KB
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<?php
namespace Html2Text;
if (!function_exists('mb_split'))
{
function mb_split($pattern, $subject, $limit = -1)
{
return preg_split('/'.$pattern.'/', $subject, $limit);
}
}
/**
* Replace all occurrences of the search string with the replacement string.
*
* @author Sean Murphy <sean@iamseanmurphy.com>
* @copyright Copyright 2012 Sean Murphy. All rights reserved.
* @license http://creativecommons.org/publicdomain/zero/1.0/
* @link http://php.net/manual/function.str-replace.php
*
* @param mixed $search
* @param mixed $replace
* @param mixed $subject
* @param int $count
* @return mixed
*/
function mb_str_replace($search, $replace, $subject, &$count = 0) {
if (!is_array($subject)) {
// Normalize $search and $replace so they are both arrays of the same length
$searches = is_array($search) ? array_values($search) : array($search);
$replacements = is_array($replace) ? array_values($replace) : array($replace);
$replacements = array_pad($replacements, count($searches), '');
foreach ($searches as $key => $search) {
$parts = mb_split(preg_quote($search), $subject);
$count += count($parts) - 1;
$subject = implode($replacements[$key], $parts);
}
} else {
// Call mb_str_replace for each subject in array, recursively
foreach ($subject as $key => $value) {
$subject[$key] = mb_str_replace($search, $replace, $value, $count);
}
}
return $subject;
}
/******************************************************************************
* Copyright (c) 2010 Jevon Wright and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* or
*
* LGPL which is available at http://www.gnu.org/licenses/lgpl.html
*
*
* Contributors:
* Jevon Wright - initial API and implementation
* Denis Flaven - some fixes for properly handling UTF-8 characters
****************************************************************************/
class Html2Text {
/**
* Tries to convert the given HTML into a plain text format - best suited for
* e-mail display, etc.
*
* <p>In particular, it tries to maintain the following features:
* <ul>
* <li>Links are maintained, with the 'href' copied over
* <li>Information in the <head> is lost
* </ul>
*
* @param string html the input HTML
* @return string the HTML converted, as best as possible, to text
* @throws Html2TextException if the HTML could not be loaded as a {@link DOMDocument}
*/
static function convert($html) {
// replace with spaces
$html = str_replace(" ", " ", $html);
$html = mb_str_replace("\xc2\xa0", " ", $html); // DO NOT USE str_replace since it breaks the "à" character which is \xc3 \xa0 in UTF-8
$html = static::fixNewlines($html);
$doc = new \DOMDocument();
if (!@$doc->loadHTML('<?xml encoding="UTF-8">'.$html)) // Forces the UTF-8 character set for HTML fragments
{
throw new Html2TextException("Could not load HTML - badly formed?", $html);
}
$output = static::iterateOverNode($doc);
// remove leading and trailing spaces on each line
$output = preg_replace("/[ \t]*\n[ \t]*/im", "\n", $output);
$output = preg_replace("/ *\t */im", "\t", $output);
// remove unnecessary empty lines
$output = preg_replace("/\n\n\n*/im", "\n\n", $output);
// remove leading and trailing whitespace
$output = trim($output);
return $output;
}
/**
* Unify newlines; in particular, \r\n becomes \n, and
* then \r becomes \n. This means that all newlines (Unix, Windows, Mac)
* all become \ns.
*
* @param string text text with any number of \r, \r\n and \n combinations
* @return string the fixed text
*/
static function fixNewlines($text) {
// replace \r\n to \n
$text = str_replace("\r\n", "\n", $text);
// remove \rs
$text = str_replace("\r", "\n", $text);
return $text;
}
static function nextChildName($node) {
// get the next child
$nextNode = $node->nextSibling;
while ($nextNode != null) {
if ($nextNode instanceof \DOMElement) {
break;
}
$nextNode = $nextNode->nextSibling;
}
$nextName = null;
if ($nextNode instanceof \DOMElement && $nextNode != null) {
$nextName = strtolower($nextNode->nodeName);
}
return $nextName;
}
static function prevChildName($node) {
// get the previous child
$nextNode = $node->previousSibling;
while ($nextNode != null) {
if ($nextNode instanceof \DOMElement) {
break;
}
$nextNode = $nextNode->previousSibling;
}
$nextName = null;
if ($nextNode instanceof \DOMElement && $nextNode != null) {
$nextName = strtolower($nextNode->nodeName);
}
return $nextName;
}
static function iterateOverNode($node) {
if ($node instanceof \DOMText) {
// Replace whitespace characters with a space (equivilant to \s)
return preg_replace("/[\\t\\n\\f\\r ]+/im", " ", $node->wholeText);
}
if ($node instanceof \DOMDocumentType) {
// ignore
return "";
}
$nextName = static::nextChildName($node);
$prevName = static::prevChildName($node);
$name = strtolower($node->nodeName);
// start whitespace
switch ($name) {
case "hr":
return "---------------------------------------------------------------\n";
case "style":
case "head":
case "title":
case "meta":
case "script":
// ignore these tags
return "";
case "h1":
case "h2":
case "h3":
case "h4":
case "h5":
case "h6":
case "ol":
case "ul":
// add two newlines, second line is added below
$output = "\n";
break;
case "td":
case "th":
// add tab char to separate table fields
$output = "\t";
break;
case "tr":
case "p":
case "div":
// add one line
$output = "\n";
break;
case "li":
$output = "- ";
break;
default:
// print out contents of unknown tags
$output = "";
break;
}
// debug
//$output .= "[$name,$nextName]";
if (isset($node->childNodes)) {
for ($i = 0; $i < $node->childNodes->length; $i++) {
$n = $node->childNodes->item($i);
$text = static::iterateOverNode($n);
$output .= $text;
}
}
// end whitespace
switch ($name) {
case "h1":
case "h2":
case "h3":
case "h4":
case "h5":
case "h6":
$output .= "\n";
break;
case "p":
case "br":
// add one line
if ($nextName != "div")
$output .= "\n";
break;
case "div":
// add one line only if the next child isn't a div
if ($nextName != "div" && $nextName != null)
$output .= "\n";
break;
case "a":
// links are returned in [text](link) format
$href = $node->getAttribute("href");
$output = trim($output);
// remove double [[ ]] s from linking images
if (substr($output, 0, 1) == "[" && substr($output, -1) == "]") {
$output = substr($output, 1, strlen($output) - 2);
// for linking images, the title of the <a> overrides the title of the <img>
if ($node->getAttribute("title")) {
$output = $node->getAttribute("title");
}
}
// if there is no link text, but a title attr
if (!$output && $node->getAttribute("title")) {
$output = $node->getAttribute("title");
}
if ($href == null) {
// it doesn't link anywhere
if ($node->getAttribute("name") != null) {
$output = "[$output]";
}
} else {
if ($href == $output || $href == "mailto:$output" || $href == "http://$output" || $href == "https://$output") {
// link to the same address: just use link
$output;
} else {
// replace it
if ($output) {
$output = "[$output]($href)";
} else {
// empty string
$output = $href;
}
}
}
// does the next node require additional whitespace?
switch ($nextName) {
case "h1": case "h2": case "h3": case "h4": case "h5": case "h6":
$output .= "\n";
break;
}
break;
case "img":
if ($node->getAttribute("title")) {
$output = "[" . $node->getAttribute("title") . "]";
} elseif ($node->getAttribute("alt")) {
$output = "[" . $node->getAttribute("alt") . "]";
} else {
$output = "";
}
break;
case "li":
$output .= "\n";
break;
default:
// do nothing
}
return $output;
}
}
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