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630 lines
20 KiB
630 lines
20 KiB
2 years ago
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<?php
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/*
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* Copyright (c) 2005-2007 Jon Abernathy <jon@chuggnutt.com>
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*
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* This script is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* The GNU General Public License can be found at
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* http://www.gnu.org/copyleft/gpl.html.
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*
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* This script is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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namespace Html2Text;
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class Html2Text
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{
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const ENCODING = 'UTF-8';
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protected $htmlFuncFlags;
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/**
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* Contains the HTML content to convert.
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*
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* @type string
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*/
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protected $html;
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/**
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* Contains the converted, formatted text.
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*
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* @type string
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*/
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protected $text;
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/**
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* List of preg* regular expression patterns to search for,
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* used in conjunction with $replace.
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*
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* @type array
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* @see $replace
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*/
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protected $search = array(
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"/\r/", // Non-legal carriage return
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"/[\n\t]+/", // Newlines and tabs
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'/<head\b[^>]*>.*?<\/head>/i', // <head>
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'/<script\b[^>]*>.*?<\/script>/i', // <script>s -- which strip_tags supposedly has problems with
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'/<style\b[^>]*>.*?<\/style>/i', // <style>s -- which strip_tags supposedly has problems with
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'/<i\b[^>]*>(.*?)<\/i>/i', // <i>
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'/<em\b[^>]*>(.*?)<\/em>/i', // <em>
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'/(<ul\b[^>]*>|<\/ul>)/i', // <ul> and </ul>
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'/(<ol\b[^>]*>|<\/ol>)/i', // <ol> and </ol>
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'/(<dl\b[^>]*>|<\/dl>)/i', // <dl> and </dl>
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'/<li\b[^>]*>(.*?)<\/li>/i', // <li> and </li>
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'/<dd\b[^>]*>(.*?)<\/dd>/i', // <dd> and </dd>
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'/<dt\b[^>]*>(.*?)<\/dt>/i', // <dt> and </dt>
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'/<li\b[^>]*>/i', // <li>
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'/<hr\b[^>]*>/i', // <hr>
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'/<div\b[^>]*>/i', // <div>
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'/(<table\b[^>]*>|<\/table>)/i', // <table> and </table>
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'/(<tr\b[^>]*>|<\/tr>)/i', // <tr> and </tr>
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'/<td\b[^>]*>(.*?)<\/td>/i', // <td> and </td>
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'/<span class="_html2text_ignore">.+?<\/span>/i', // <span class="_html2text_ignore">...</span>
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'/<(img)\b[^>]*alt=\"([^>"]+)\"[^>]*>/i', // <img> with alt tag
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);
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/**
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* List of pattern replacements corresponding to patterns searched.
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*
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* @type array
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* @see $search
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*/
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protected $replace = array(
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'', // Non-legal carriage return
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' ', // Newlines and tabs
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'', // <head>
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'', // <script>s -- which strip_tags supposedly has problems with
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'', // <style>s -- which strip_tags supposedly has problems with
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'_\\1_', // <i>
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'_\\1_', // <em>
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"\n\n", // <ul> and </ul>
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"\n\n", // <ol> and </ol>
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"\n\n", // <dl> and </dl>
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"\t* \\1\n", // <li> and </li>
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" \\1\n", // <dd> and </dd>
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"\t* \\1", // <dt> and </dt>
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"\n\t* ", // <li>
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"\n-------------------------\n", // <hr>
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"<div>\n", // <div>
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"\n\n", // <table> and </table>
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"\n", // <tr> and </tr>
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"\t\t\\1\n", // <td> and </td>
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"", // <span class="_html2text_ignore">...</span>
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'[\\2]', // <img> with alt tag
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);
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/**
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* List of preg* regular expression patterns to search for,
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* used in conjunction with $entReplace.
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*
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* @type array
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* @see $entReplace
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*/
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protected $entSearch = array(
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'/™/i', // TM symbol in win-1252
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'/—/i', // m-dash in win-1252
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'/&(amp|#38);/i', // Ampersand: see converter()
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'/[ ]{2,}/', // Runs of spaces, post-handling
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);
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/**
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* List of pattern replacements corresponding to patterns searched.
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*
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* @type array
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* @see $entSearch
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*/
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protected $entReplace = array(
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'™', // TM symbol
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'—', // m-dash
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'|+|amp|+|', // Ampersand: see converter()
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' ', // Runs of spaces, post-handling
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);
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/**
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* List of preg* regular expression patterns to search for
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* and replace using callback function.
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*
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* @type array
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*/
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protected $callbackSearch = array(
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'/<(h)[123456]( [^>]*)?>(.*?)<\/h[123456]>/i', // h1 - h6
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'/[ ]*<(p)( [^>]*)?>(.*?)<\/p>[ ]*/si', // <p> with surrounding whitespace.
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'/<(br)[^>]*>[ ]*/i', // <br> with leading whitespace after the newline.
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'/<(b)( [^>]*)?>(.*?)<\/b>/i', // <b>
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'/<(strong)( [^>]*)?>(.*?)<\/strong>/i', // <strong>
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'/<(th)( [^>]*)?>(.*?)<\/th>/i', // <th> and </th>
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'/<(a) [^>]*href=("|\')([^"\']+)\2([^>]*)>(.*?)<\/a>/i' // <a href="">
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);
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/**
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* List of preg* regular expression patterns to search for in PRE body,
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* used in conjunction with $preReplace.
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*
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* @type array
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* @see $preReplace
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*/
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protected $preSearch = array(
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"/\n/",
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"/\t/",
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'/ /',
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'/<pre[^>]*>/',
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'/<\/pre>/'
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);
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/**
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* List of pattern replacements corresponding to patterns searched for PRE body.
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*
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* @type array
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* @see $preSearch
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*/
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protected $preReplace = array(
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'<br>',
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' ',
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' ',
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'',
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'',
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);
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/**
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* Temporary workspace used during PRE processing.
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*
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* @type string
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*/
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protected $preContent = '';
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/**
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* Contains the base URL that relative links should resolve to.
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*
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* @type string
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*/
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protected $baseurl = '';
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/**
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* Indicates whether content in the $html variable has been converted yet.
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*
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* @type boolean
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* @see $html, $text
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*/
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protected $converted = false;
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/**
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* Contains URL addresses from links to be rendered in plain text.
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*
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* @type array
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* @see buildlinkList()
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*/
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protected $linkList = array();
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/**
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* Various configuration options (able to be set in the constructor)
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*
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* @type array
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*/
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protected $options = array(
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'do_links' => 'inline', // 'none'
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// 'inline' (show links inline)
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// 'nextline' (show links on the next line)
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// 'table' (if a table of link URLs should be listed after the text.
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// 'bbcode' (show links as bbcode)
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'width' => 70, // Maximum width of the formatted text, in columns.
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// Set this value to 0 (or less) to ignore word wrapping
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// and not constrain text to a fixed-width column.
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);
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private function legacyConstruct($html = '', $fromFile = false, array $options = array())
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{
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$this->set_html($html, $fromFile);
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$this->options = array_merge($this->options, $options);
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}
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/**
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* @param string $html Source HTML
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* @param array $options Set configuration options
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*/
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public function __construct($html = '', $options = array())
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{
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// for backwards compatibility
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if (!is_array($options)) {
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return call_user_func_array(array($this, 'legacyConstruct'), func_get_args());
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}
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$this->html = $html;
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$this->options = array_merge($this->options, $options);
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$this->htmlFuncFlags = (PHP_VERSION_ID < 50400)
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? ENT_COMPAT
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: ENT_COMPAT | ENT_HTML5;
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}
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/**
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* Get the source HTML
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*
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* @return string
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*/
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public function getHtml()
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{
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return $this->html;
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}
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/**
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* Set the source HTML
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*
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* @param string $html HTML source content
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*/
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public function setHtml($html)
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{
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$this->html = $html;
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$this->converted = false;
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}
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/**
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* @deprecated
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*/
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public function set_html($html, $from_file = false)
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{
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if ($from_file) {
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throw new \InvalidArgumentException("Argument from_file no longer supported");
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}
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return $this->setHtml($html);
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}
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/**
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* Returns the text, converted from HTML.
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*
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* @return string
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*/
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public function getText()
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{
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if (!$this->converted) {
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$this->convert();
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}
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return $this->text;
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}
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/**
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* @deprecated
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*/
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public function get_text()
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{
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return $this->getText();
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}
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/**
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* @deprecated
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*/
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public function print_text()
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{
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print $this->getText();
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}
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/**
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* @deprecated
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*/
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public function p()
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{
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return $this->print_text();
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}
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/**
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* Sets a base URL to handle relative links.
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*
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* @param string $baseurl
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*/
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public function setBaseUrl($baseurl)
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{
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$this->baseurl = $baseurl;
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}
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/**
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* @deprecated
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*/
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public function set_base_url($baseurl)
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{
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return $this->setBaseUrl($baseurl);
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}
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protected function convert()
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{
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$origEncoding = mb_internal_encoding();
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mb_internal_encoding(self::ENCODING);
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$this->doConvert();
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mb_internal_encoding($origEncoding);
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}
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protected function doConvert()
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{
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$this->linkList = array();
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$text = trim($this->html);
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$this->converter($text);
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if ($this->linkList) {
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$text .= "\n\nLinks:\n------\n";
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foreach ($this->linkList as $i => $url) {
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$text .= '[' . ($i + 1) . '] ' . $url . "\n";
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}
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}
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$this->text = $text;
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$this->converted = true;
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}
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protected function converter(&$text)
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{
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$this->convertBlockquotes($text);
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$this->convertPre($text);
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$text = preg_replace($this->search, $this->replace, $text);
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$text = preg_replace_callback($this->callbackSearch, array($this, 'pregCallback'), $text);
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$text = strip_tags($text);
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$text = preg_replace($this->entSearch, $this->entReplace, $text);
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$text = html_entity_decode($text, $this->htmlFuncFlags, self::ENCODING);
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// Remove unknown/unhandled entities (this cannot be done in search-and-replace block)
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$text = preg_replace('/&([a-zA-Z0-9]{2,6}|#[0-9]{2,4});/', '', $text);
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// Convert "|+|amp|+|" into "&", need to be done after handling of unknown entities
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// This properly handles situation of "&quot;" in input string
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$text = str_replace('|+|amp|+|', '&', $text);
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// Normalise empty lines
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$text = preg_replace("/\n\s+\n/", "\n\n", $text);
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$text = preg_replace("/[\n]{3,}/", "\n\n", $text);
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// remove leading empty lines (can be produced by eg. P tag on the beginning)
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$text = ltrim($text, "\n");
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if ($this->options['width'] > 0) {
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|
|
$text = wordwrap($text, $this->options['width']);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Helper function called by preg_replace() on link replacement.
|
||
|
|
*
|
||
|
|
* Maintains an internal list of links to be displayed at the end of the
|
||
|
|
* text, with numeric indices to the original point in the text they
|
||
|
|
* appeared. Also makes an effort at identifying and handling absolute
|
||
|
|
* and relative links.
|
||
|
|
*
|
||
|
|
* @param string $link URL of the link
|
||
|
|
* @param string $display Part of the text to associate number with
|
||
|
|
* @param null $linkOverride
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
protected function buildlinkList($link, $display, $linkOverride = null)
|
||
|
|
{
|
||
|
|
$linkMethod = ($linkOverride) ? $linkOverride : $this->options['do_links'];
|
||
|
|
if ($linkMethod == 'none') {
|
||
|
|
return $display;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Ignored link types
|
||
|
|
if (preg_match('!^(javascript:|mailto:|#)!i', $link)) {
|
||
|
|
return $display;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (preg_match('!^([a-z][a-z0-9.+-]+:)!i', $link)) {
|
||
|
|
$url = $link;
|
||
|
|
} else {
|
||
|
|
$url = $this->baseurl;
|
||
|
|
if (mb_substr($link, 0, 1) != '/') {
|
||
|
|
$url .= '/';
|
||
|
|
}
|
||
|
|
$url .= $link;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($linkMethod == 'table') {
|
||
|
|
if (($index = array_search($url, $this->linkList)) === false) {
|
||
|
|
$index = count($this->linkList);
|
||
|
|
$this->linkList[] = $url;
|
||
|
|
}
|
||
|
|
|
||
|
|
return $display . ' [' . ($index + 1) . ']';
|
||
|
|
} elseif ($linkMethod == 'nextline') {
|
||
|
|
if ($url === $display) {
|
||
|
|
return $display;
|
||
|
|
}
|
||
|
|
return $display . "\n[" . $url . ']';
|
||
|
|
} elseif ($linkMethod == 'bbcode') {
|
||
|
|
return sprintf('[url=%s]%s[/url]', $url, $display);
|
||
|
|
} else { // link_method defaults to inline
|
||
|
|
if ($url === $display) {
|
||
|
|
return $display;
|
||
|
|
}
|
||
|
|
return $display . ' [' . $url . ']';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
protected function convertPre(&$text)
|
||
|
|
{
|
||
|
|
// get the content of PRE element
|
||
|
|
while (preg_match('/<pre[^>]*>(.*)<\/pre>/ismU', $text, $matches)) {
|
||
|
|
// Replace br tags with newlines to prevent the search-and-replace callback from killing whitespace
|
||
|
|
$this->preContent = preg_replace('/(<br\b[^>]*>)/i', "\n", $matches[1]);
|
||
|
|
|
||
|
|
// Run our defined tags search-and-replace with callback
|
||
|
|
$this->preContent = preg_replace_callback(
|
||
|
|
$this->callbackSearch,
|
||
|
|
array($this, 'pregCallback'),
|
||
|
|
$this->preContent
|
||
|
|
);
|
||
|
|
|
||
|
|
// convert the content
|
||
|
|
$this->preContent = sprintf(
|
||
|
|
'<div><br>%s<br></div>',
|
||
|
|
preg_replace($this->preSearch, $this->preReplace, $this->preContent)
|
||
|
|
);
|
||
|
|
|
||
|
|
// replace the content (use callback because content can contain $0 variable)
|
||
|
|
$text = preg_replace_callback(
|
||
|
|
'/<pre[^>]*>.*<\/pre>/ismU',
|
||
|
|
array($this, 'pregPreCallback'),
|
||
|
|
$text,
|
||
|
|
1
|
||
|
|
);
|
||
|
|
|
||
|
|
// free memory
|
||
|
|
$this->preContent = '';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Helper function for BLOCKQUOTE body conversion.
|
||
|
|
*
|
||
|
|
* @param string $text HTML content
|
||
|
|
*/
|
||
|
|
protected function convertBlockquotes(&$text)
|
||
|
|
{
|
||
|
|
if (preg_match_all('/<\/*blockquote[^>]*>/i', $text, $matches, PREG_OFFSET_CAPTURE)) {
|
||
|
|
$originalText = $text;
|
||
|
|
$start = 0;
|
||
|
|
$taglen = 0;
|
||
|
|
$level = 0;
|
||
|
|
$diff = 0;
|
||
|
|
foreach ($matches[0] as $m) {
|
||
|
|
$m[1] = mb_strlen(substr($originalText, 0, $m[1]));
|
||
|
|
if ($m[0][0] == '<' && $m[0][1] == '/') {
|
||
|
|
$level--;
|
||
|
|
if ($level < 0) {
|
||
|
|
$level = 0; // malformed HTML: go to next blockquote
|
||
|
|
} elseif ($level > 0) {
|
||
|
|
// skip inner blockquote
|
||
|
|
} else {
|
||
|
|
$end = $m[1];
|
||
|
|
$len = $end - $taglen - $start;
|
||
|
|
// Get blockquote content
|
||
|
|
$body = mb_substr($text, $start + $taglen - $diff, $len);
|
||
|
|
|
||
|
|
// Set text width
|
||
|
|
$pWidth = $this->options['width'];
|
||
|
|
if ($this->options['width'] > 0) $this->options['width'] -= 2;
|
||
|
|
// Convert blockquote content
|
||
|
|
$body = trim($body);
|
||
|
|
$this->converter($body);
|
||
|
|
// Add citation markers and create PRE block
|
||
|
|
$body = preg_replace('/((^|\n)>*)/', '\\1> ', trim($body));
|
||
|
|
$body = '<pre>' . htmlspecialchars($body, $this->htmlFuncFlags, self::ENCODING) . '</pre>';
|
||
|
|
// Re-set text width
|
||
|
|
$this->options['width'] = $pWidth;
|
||
|
|
// Replace content
|
||
|
|
$text = mb_substr($text, 0, $start - $diff)
|
||
|
|
. $body
|
||
|
|
. mb_substr($text, $end + mb_strlen($m[0]) - $diff);
|
||
|
|
|
||
|
|
$diff += $len + $taglen + mb_strlen($m[0]) - mb_strlen($body);
|
||
|
|
unset($body);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if ($level == 0) {
|
||
|
|
$start = $m[1];
|
||
|
|
$taglen = mb_strlen($m[0]);
|
||
|
|
}
|
||
|
|
$level++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Callback function for preg_replace_callback use.
|
||
|
|
*
|
||
|
|
* @param array $matches PREG matches
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
protected function pregCallback($matches)
|
||
|
|
{
|
||
|
|
switch (mb_strtolower($matches[1])) {
|
||
|
|
case 'p':
|
||
|
|
// Replace newlines with spaces.
|
||
|
|
$para = str_replace("\n", " ", $matches[3]);
|
||
|
|
|
||
|
|
// Trim trailing and leading whitespace within the tag.
|
||
|
|
$para = trim($para);
|
||
|
|
|
||
|
|
// Add trailing newlines for this para.
|
||
|
|
return "\n" . $para . "\n";
|
||
|
|
case 'br':
|
||
|
|
return "\n";
|
||
|
|
case 'b':
|
||
|
|
case 'strong':
|
||
|
|
return $this->toupper($matches[3]);
|
||
|
|
case 'th':
|
||
|
|
return $this->toupper("\t\t" . $matches[3] . "\n");
|
||
|
|
case 'h':
|
||
|
|
return $this->toupper("\n\n" . $matches[3] . "\n\n");
|
||
|
|
case 'a':
|
||
|
|
// override the link method
|
||
|
|
$linkOverride = null;
|
||
|
|
if (preg_match('/_html2text_link_(\w+)/', $matches[4], $linkOverrideMatch)) {
|
||
|
|
$linkOverride = $linkOverrideMatch[1];
|
||
|
|
}
|
||
|
|
// Remove spaces in URL (#1487805)
|
||
|
|
$url = str_replace(' ', '', $matches[3]);
|
||
|
|
|
||
|
|
return $this->buildlinkList($url, $matches[5], $linkOverride);
|
||
|
|
}
|
||
|
|
|
||
|
|
return '';
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Callback function for preg_replace_callback use in PRE content handler.
|
||
|
|
*
|
||
|
|
* @param array $matches PREG matches
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
protected function pregPreCallback(/** @noinspection PhpUnusedParameterInspection */ $matches)
|
||
|
|
{
|
||
|
|
return $this->preContent;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Strtoupper function with HTML tags and entities handling.
|
||
|
|
*
|
||
|
|
* @param string $str Text to convert
|
||
|
|
* @return string Converted text
|
||
|
|
*/
|
||
|
|
protected function toupper($str)
|
||
|
|
{
|
||
|
|
// string can contain HTML tags
|
||
|
|
$chunks = preg_split('/(<[^>]*>)/', $str, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
|
||
|
|
|
||
|
|
// convert toupper only the text between HTML tags
|
||
|
|
foreach ($chunks as $i => $chunk) {
|
||
|
|
if ($chunk[0] != '<') {
|
||
|
|
$chunks[$i] = $this->strtoupper($chunk);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return implode($chunks);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Strtoupper multibyte wrapper function with HTML entities handling.
|
||
|
|
*
|
||
|
|
* @param string $str Text to convert
|
||
|
|
* @return string Converted text
|
||
|
|
*/
|
||
|
|
protected function strtoupper($str)
|
||
|
|
{
|
||
|
|
$str = html_entity_decode($str, $this->htmlFuncFlags, self::ENCODING);
|
||
|
|
$str = mb_strtoupper($str);
|
||
|
|
$str = htmlspecialchars($str, $this->htmlFuncFlags, self::ENCODING);
|
||
|
|
|
||
|
|
return $str;
|
||
|
|
}
|
||
|
|
}
|