mirror of
https://github.com/moodle/moodle.git
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96 lines
5.8 KiB
PHP
96 lines
5.8 KiB
PHP
<?php
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/***************************************************************
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* Library to convert HTML into an approximate text equivalent *
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***************************************************************
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Version: 1.0 (with modifications)
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Copyright 2002 Mark Wilton-Jones
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License: HowToCreate script license with written permission
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URL: http://www.howtocreate.co.uk/php/
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For full details about the script and to get the latest version,
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please see the HowToCreate web site above.
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This version contains modifications for Moodle. In each case the
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original line has been commented out below and a new line has been
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added, so it should be easy to see what has changed.
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--------------------------------------------------------------
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*/
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function html2text( $badStr ) {
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//remove PHP if it exists
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if( $andPHP ) { while( substr_count( $badStr, '<'.'?' ) && substr_count( $badStr, '?'.'>' ) && strpos( $badStr, '?'.'>' ) > strpos( $badStr, '<'.'?', strpos( $badStr, '?'.'>' ) ) ) {
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$badStr = substr( $badStr, 0, strpos( $badStr, '<'.'?' ) ) . substr( $badStr, strpos( $badStr, '?'.'>', strpos( $badStr, '?'.'>' ) ) + 2 ); } }
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//remove comments
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while( substr_count( $badStr, '<!--' ) && substr_count( $badStr, '-->' ) && strpos( $badStr, '-->' ) > strpos( $badStr, '<!--', strpos( $badStr, '-->' ) ) ) {
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$badStr = substr( $badStr, 0, strpos( $badStr, '<!--' ) ) . substr( $badStr, strpos( $badStr, '-->', strpos( $badStr, '-->' ) ) + 3 ); }
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//now make sure all HTML tags are correctly written (> not in between quotes)
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for( $x = 0, $goodStr = '', $is_open_tb = false, $is_open_sq = false, $is_open_sq = false; strlen( $chr = $badStr{$x} ); $x++ ) {
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//take each letter in turn and check if that character is permitted there
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switch( $chr ) {
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case '<':
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if( !$is_open_tb && strtolower( substr( $badStr, $x + 1, 5 ) ) == 'style' ) {
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$badStr = substr( $badStr, 0, $x ) . substr( $badStr, strpos( strtolower( $badStr ), '</style>', $x ) + 7 ); $chr = '';
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} elseif( !$is_open_tb && strtolower( substr( $badStr, $x + 1, 6 ) ) == 'script' ) {
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$badStr = substr( $badStr, 0, $x ) . substr( $badStr, strpos( strtolower( $badStr ), '</script>', $x ) + 8 ); $chr = '';
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} elseif( !$is_open_tb ) { $is_open_tb = true; } else { $chr = '<'; }
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break;
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case '>':
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if( !$is_open_tb || $is_open_dq || $is_open_sq ) { $chr = '>'; } else { $is_open_tb = false; }
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break;
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case '"':
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if( $is_open_tb && !$is_open_dq && !$is_open_sq ) { $is_open_dq = true; }
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elseif( $is_open_tb && $is_open_dq && !$is_open_sq ) { $is_open_dq = false; }
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else { $chr = '"'; }
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break;
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case "'":
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if( $is_open_tb && !$is_open_dq && !$is_open_sq ) { $is_open_sq = true; }
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elseif( $is_open_tb && !$is_open_dq && $is_open_sq ) { $is_open_sq = false; }
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} $goodStr .= $chr;
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}
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//now that the page is valid (I hope) for strip_tags, strip all unwanted tags
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$goodStr = strip_tags( $goodStr, '<title><hr><h1><h2><h3><h4><h5><h6><div><p><pre><sup><ul><ol><br><dl><dt><table><caption><tr><li><dd><th><td><a><area><img><form><input><textarea><button><select><option>' );
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//strip extra whitespace except between <pre> and <textarea> tags
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$badStr = preg_split( "/<\/?pre[^>]*>/i", $goodStr );
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for( $x = 0; is_string( $badStr[$x] ); $x++ ) {
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if( $x % 2 ) { $badStr[$x] = '<pre>'.$badStr[$x].'</pre>'; } else {
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$goodStr = preg_split( "/<\/?textarea[^>]*>/i", $badStr[$x] );
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for( $z = 0; is_string( $goodStr[$z] ); $z++ ) {
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if( $z % 2 ) { $goodStr[$z] = '<textarea>'.$goodStr[$z].'</textarea>'; } else {
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$goodStr[$z] = preg_replace( "/\s+/", ' ', $goodStr[$z] );
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} }
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$badStr[$x] = implode('',$goodStr);
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} }
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$goodStr = implode('',$badStr);
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//remove all options from select inputs
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$goodStr = preg_replace( "/<option[^>]*>[^<]*/i", '', $goodStr );
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//replace all tags with their text equivalents
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$goodStr = preg_replace( "/<(\/title|hr)[^>]*>/i", "\n --------------------\n", $goodStr );
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$goodStr = preg_replace( "/<(h|div|p)[^>]*>/i", "\n\n", $goodStr );
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$goodStr = preg_replace( "/<sup[^>]*>/i", '^', $goodStr );
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$goodStr = preg_replace( "/<(ul|ol|br|dl|dt|table|caption|\/textarea|tr[^>]*>\s*<(td|th))[^>]*>/i", "\n", $goodStr );
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$goodStr = preg_replace( "/<li[^>]*>/i", "\n<EFBFBD> ", $goodStr );
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$goodStr = preg_replace( "/<dd[^>]*>/i", "\n\t", $goodStr );
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$goodStr = preg_replace( "/<(th|td)[^>]*>/i", "\t", $goodStr );
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//$goodStr = preg_replace( "/<a[^>]* href=(\"((?!\"|#|javascript:)[^\"#]*)(\"|#)|'((?!'|#|javascript:)[^'#]*)('|#)|((?!'|\"|>|#|javascript:)[^#\"'> ]*))[^>]*>/i", "[LINK: $2$4$6] ", $goodStr ); // Moodle
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$goodStr = preg_replace( "/<a[^>]* href=(\"((?!\"|#|javascript:)[^\"#]*)(\"|#)|'((?!'|#|javascript:)[^'#]*)('|#)|((?!'|\"|>|#|javascript:)[^#\"'> ]*))[^>]*>/i", "[$2$4$6] ", $goodStr );
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//$goodStr = preg_replace( "/<img[^>]* alt=(\"([^\"]+)\"|'([^']+)'|([^\"'> ]+))[^>]*>/i", "[IMAGE: $2$3$4] ", $goodStr ); // Moodle
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$goodStr = preg_replace( "/<img[^>]* alt=(\"([^\"]+)\"|'([^']+)'|([^\"'> ]+))[^>]*>/i", "[$2$3$4] ", $goodStr );
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$goodStr = preg_replace( "/<form[^>]* action=(\"([^\"]+)\"|'([^']+)'|([^\"'> ]+))[^>]*>/i", "\n[FORM: $2$3$4] ", $goodStr );
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$goodStr = preg_replace( "/<(input|textarea|button|select)[^>]*>/i", "[INPUT] ", $goodStr );
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//strip all remaining tags (mostly closing tags)
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$goodStr = strip_tags( $goodStr );
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//convert HTML entities
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$goodStr = strtr( $goodStr, array_flip( get_html_translation_table( HTML_ENTITIES ) ) );
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preg_replace( "/&#(\d+);/me", "chr('$1')", $goodStr );
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//wordwrap
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// $goodStr = wordwrap( $goodStr ); // Moodle
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$goodStr = wordwrap( $goodStr, 70 );
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//make sure there are no more than 3 linebreaks in a row and trim whitespace
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return preg_replace( "/^\n*|\n*$/", '', preg_replace( "/[ \t]+(\n|$)/", "$1", preg_replace( "/\n(\s*\n){2}/", "\n\n\n", preg_replace( "/\r\n?|\f/", "\n", str_replace( chr(160), ' ', $goodStr ) ) ) ) );
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}
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?>
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