320 lines
9.0 KiB
PHP
320 lines
9.0 KiB
PHP
<?php
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/**
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* Library of conversion functions, implemented as static methods.
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*
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* The methods are all of the form (format)2(format), where the format is one of
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*
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* raw: A UTF8 string
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* attr: A UTF8 string suitable for inclusion in an HTML attribute
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* js: A UTF8 string suitable for inclusion in a double-quoted javascript string.
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*
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* array: A PHP associative array
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* json: JavaScript object notation
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*
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* html: HTML source suitable for use in a page or email
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* text: Plain-text content, suitable for display to a user as-is, or insertion in a plaintext email.
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*
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* Objects of type {@link ViewableData} can have an "escaping type",
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* which determines if they are automatically escaped before output by {@link SSViewer}.
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*
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* @package framework
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* @subpackage misc
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*/
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class Convert {
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/**
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* Convert a value to be suitable for an XML attribute.
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*
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* @param array|string $val String to escape, or array of strings
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* @return array|string
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*/
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static function raw2att($val) {
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return self::raw2xml($val);
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}
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/**
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* Convert a value to be suitable for an HTML attribute.
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*
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* @param string|array $val String to escape, or array of strings
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* @return array|string
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*/
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static function raw2htmlatt($val) {
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return self::raw2att($val);
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}
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/**
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* Convert a value to be suitable for an HTML attribute.
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*
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* This is useful for converting human readable values into
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* a value suitable for an ID or NAME attribute.
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*
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* @see http://www.w3.org/TR/REC-html40/types.html#type-cdata
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* @uses Convert::raw2att()
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* @param array|string $val String to escape, or array of strings
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* @return array|string
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*/
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static function raw2htmlname($val) {
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if(is_array($val)) {
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foreach($val as $k => $v) $val[$k] = self::raw2htmlname($v);
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return $val;
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} else {
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return preg_replace('/[^a-zA-Z0-9\-_:.]+/','', $val);
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}
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}
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/**
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* Ensure that text is properly escaped for XML.
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*
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* @see http://www.w3.org/TR/REC-xml/#dt-escape
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* @param array|string $val String to escape, or array of strings
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* @return array|string
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*/
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static function raw2xml($val) {
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if(is_array($val)) {
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foreach($val as $k => $v) $val[$k] = self::raw2xml($v);
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return $val;
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} else {
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return htmlspecialchars($val, ENT_QUOTES, 'UTF-8');
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}
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}
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/**
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* Ensure that text is properly escaped for Javascript.
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*
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* @param array|string $val String to escape, or array of strings
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* @return array|string
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*/
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static function raw2js($val) {
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if(is_array($val)) {
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foreach($val as $k => $v) $val[$k] = self::raw2js($v);
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return $val;
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} else {
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return str_replace(array("\\", '"', "\n", "\r", "'"), array("\\\\", '\"', '\n', '\r', "\\'"), $val);
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}
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}
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/**
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* Encode a value as a JSON encoded string.
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*
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* @param mixed $val Value to be encoded
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* @return string JSON encoded string
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*/
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static function raw2json($val) {
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return json_encode($val);
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}
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/**
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* Encode an array as a JSON encoded string.
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* THis is an alias to {@link raw2json()}
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*
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* @param array $val Array to convert
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* @return string JSON encoded string
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*/
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static function array2json($val) {
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return self::raw2json($val);
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}
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static function raw2sql($val) {
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if(is_array($val)) {
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foreach($val as $k => $v) $val[$k] = self::raw2sql($v);
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return $val;
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} else {
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return DB::getConn()->addslashes($val);
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}
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}
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/**
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* Convert XML to raw text.
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* @uses html2raw()
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* @todo Currently &#xxx; entries are stripped; they should be converted
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*/
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static function xml2raw($val) {
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if(is_array($val)) {
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foreach($val as $k => $v) $val[$k] = self::xml2raw($v);
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return $val;
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} else {
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// More complex text needs to use html2raw instead
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if(strpos($val,'<') !== false) return self::html2raw($val);
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else return html_entity_decode($val, ENT_QUOTES, 'UTF-8');
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}
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}
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/**
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* Convert a JSON encoded string into an object.
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*
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* @param string $val
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* @return object|boolean
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*/
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static function json2obj($val) {
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return json_decode($val);
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}
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/**
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* Convert a JSON string into an array.
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*
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* @uses json2obj
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* @param string $val JSON string to convert
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* @return array|boolean
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*/
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static function json2array($val) {
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return json_decode($val, true);
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}
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/**
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* Converts an XML string to a PHP array
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*
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* @uses recursiveXMLToArray()
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* @param string
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*
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* @return array
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*/
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static function xml2array($val) {
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$xml = new SimpleXMLElement($val);
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return self::recursiveXMLToArray($xml);
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}
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/**
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* Convert a XML string to a PHP array recursively. Do not
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* call this function directly, Please use {@link Convert::xml2array()}
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*
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* @param SimpleXMLElement
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*
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* @return mixed
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*/
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protected static function recursiveXMLToArray($xml) {
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if(is_object($xml) && get_class($xml) == 'SimpleXMLElement') {
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$attributes = $xml->attributes();
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foreach($attributes as $k => $v) {
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if($v) $a[$k] = (string) $v;
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}
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$x = $xml;
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$xml = get_object_vars($xml);
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}
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if(is_array($xml)) {
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if(count($xml) == 0) return (string) $x; // for CDATA
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foreach($xml as $key => $value) {
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$r[$key] = self::recursiveXMLToArray($value);
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}
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if(isset($a)) $r['@'] = $a; // Attributes
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return $r;
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}
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return (string) $xml;
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}
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/**
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* Create a link if the string is a valid URL
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*
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* @param string The string to linkify
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* @return A link to the URL if string is a URL
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*/
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static function linkIfMatch($string) {
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if( preg_match( '/^[a-z+]+\:\/\/[a-zA-Z0-9$-_.+?&=!*\'()%]+$/', $string ) )
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return "<a style=\"white-space: nowrap\" href=\"$string\">$string</a>";
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else
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return $string;
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}
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/**
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* Simple conversion of HTML to plaintext.
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*
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* @param $data string
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* @param $preserveLinks boolean
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* @param $wordwrap array
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*/
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static function html2raw($data, $preserveLinks = false, $wordWrap = 60, $config = null) {
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$defaultConfig = array(
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'PreserveLinks' => false,
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'ReplaceBoldAsterisk' => true,
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'CompressWhitespace' => true,
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'ReplaceImagesWithAlt' => true,
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);
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if(isset($config)) {
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$config = array_merge($defaultConfig,$config);
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} else {
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$config = $defaultConfig;
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}
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$data = preg_replace("/<style([^A-Za-z0-9>][^>]*)?>.*?<\/style[^>]*>/is","", $data);
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$data = preg_replace("/<script([^A-Za-z0-9>][^>]*)?>.*?<\/script[^>]*>/is","", $data);
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if($config['ReplaceBoldAsterisk']) {
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$data = preg_replace('%<(strong|b)( [^>]*)?>|</(strong|b)>%i','*',$data);
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}
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// Expand hyperlinks
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if(!$preserveLinks && !$config['PreserveLinks']) {
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$data = preg_replace('/<a[^>]*href\s*=\s*"([^"]*)">(.*?)<\/a>/ie', "Convert::html2raw('\\2').'[\\1]'", $data);
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$data = preg_replace('/<a[^>]*href\s*=\s*([^ ]*)>(.*?)<\/a>/ie', "Convert::html2raw('\\2').'[\\1]'", $data);
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}
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// Replace images with their alt tags
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if($config['ReplaceImagesWithAlt']) {
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$data = preg_replace('/<img[^>]*alt *= *"([^"]*)"[^>]*>/i', ' \\1 ', $data);
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$data = preg_replace('/<img[^>]*alt *= *([^ ]*)[^>]*>/i', ' \\1 ', $data);
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}
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// Compress whitespace
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if($config['CompressWhitespace']) {
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$data = preg_replace("/\s+/", " ", $data);
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}
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// Parse newline tags
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$data = preg_replace("/\s*<[Hh][1-6]([^A-Za-z0-9>][^>]*)?> */", "\n\n", $data);
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$data = preg_replace("/\s*<[Pp]([^A-Za-z0-9>][^>]*)?> */", "\n\n", $data);
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$data = preg_replace("/\s*<[Dd][Ii][Vv]([^A-Za-z0-9>][^>]*)?> */", "\n\n", $data);
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$data = preg_replace("/\n\n\n+/", "\n\n", $data);
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$data = preg_replace("/<[Bb][Rr]([^A-Za-z0-9>][^>]*)?> */", "\n", $data);
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$data = preg_replace("/<[Tt][Rr]([^A-Za-z0-9>][^>]*)?> */", "\n", $data);
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$data = preg_replace("/<\/[Tt][Dd]([^A-Za-z0-9>][^>]*)?> */", " ", $data);
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$data = preg_replace('/<\/p>/i', "\n\n", $data );
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// Replace HTML entities
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//$data = preg_replace("/&#([0-9]+);/e", 'chr(\1)', $data);
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//$data = str_replace(array("<",">","&"," "), array("<", ">", "&", " "), $data);
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$data = html_entity_decode($data, ENT_COMPAT , 'UTF-8');
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// Remove all tags (but optionally keep links)
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// strip_tags seemed to be restricting the length of the output
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// arbitrarily. This essentially does the same thing.
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if(!$preserveLinks && !$config['PreserveLinks']) {
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$data = preg_replace('/<\/?[^>]*>/','', $data);
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} else {
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$data = strip_tags($data, '<a>');
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}
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return trim(wordwrap(trim($data), $wordWrap));
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}
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/**
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* There are no real specifications on correctly encoding mailto-links,
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* but this seems to be compatible with most of the user-agents.
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* Does nearly the same as rawurlencode().
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* Please only encode the values, not the whole url, e.g.
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* "mailto:test@test.com?subject=" . Convert::raw2mailto($subject)
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*
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* @param $data string
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* @return string
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* @see http://www.ietf.org/rfc/rfc1738.txt
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*/
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static function raw2mailto($data) {
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return str_ireplace(
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array("\n",'?','=',' ','(',')','&','@','"','\'',';'),
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array('%0A','%3F','%3D','%20','%28','%29','%26','%40','%22','%27','%3B'),
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$data
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);
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}
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/**
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* Convert a string (normally a title) to a string suitable for using in
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* urls and other html attributes. Uses {@link URLSegmentFilter}.
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*
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* @param string
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* @return string
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*/
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public static function raw2url($title) {
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$f = URLSegmentFilter::create();
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return $f->filter($title);
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}
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}
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