mirror of
https://github.com/renbaoshuo/S2OJ.git
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287 lines
10 KiB
PHP
287 lines
10 KiB
PHP
<?php
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/**
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* Generates HTML from tokens.
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* @todo Refactor interface so that configuration/context is determined
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* upon instantiation, no need for messy generateFromTokens() calls
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* @todo Make some of the more internal functions protected, and have
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* unit tests work around that
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*/
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class HTMLPurifier_Generator
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{
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/**
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* Whether or not generator should produce XML output.
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* @type bool
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*/
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private $_xhtml = true;
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/**
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* :HACK: Whether or not generator should comment the insides of <script> tags.
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* @type bool
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*/
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private $_scriptFix = false;
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/**
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* Cache of HTMLDefinition during HTML output to determine whether or
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* not attributes should be minimized.
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* @type HTMLPurifier_HTMLDefinition
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*/
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private $_def;
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/**
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* Cache of %Output.SortAttr.
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* @type bool
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*/
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private $_sortAttr;
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/**
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* Cache of %Output.FlashCompat.
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* @type bool
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*/
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private $_flashCompat;
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/**
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* Cache of %Output.FixInnerHTML.
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* @type bool
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*/
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private $_innerHTMLFix;
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/**
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* Stack for keeping track of object information when outputting IE
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* compatibility code.
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* @type array
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*/
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private $_flashStack = array();
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/**
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* Configuration for the generator
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* @type HTMLPurifier_Config
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*/
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protected $config;
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/**
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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*/
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public function __construct($config, $context)
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{
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$this->config = $config;
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$this->_scriptFix = $config->get('Output.CommentScriptContents');
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$this->_innerHTMLFix = $config->get('Output.FixInnerHTML');
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$this->_sortAttr = $config->get('Output.SortAttr');
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$this->_flashCompat = $config->get('Output.FlashCompat');
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$this->_def = $config->getHTMLDefinition();
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$this->_xhtml = $this->_def->doctype->xml;
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}
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/**
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* Generates HTML from an array of tokens.
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* @param HTMLPurifier_Token[] $tokens Array of HTMLPurifier_Token
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* @return string Generated HTML
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*/
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public function generateFromTokens($tokens)
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{
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if (!$tokens) {
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return '';
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}
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// Basic algorithm
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$html = '';
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for ($i = 0, $size = count($tokens); $i < $size; $i++) {
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if ($this->_scriptFix && $tokens[$i]->name === 'script'
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&& $i + 2 < $size && $tokens[$i+2] instanceof HTMLPurifier_Token_End) {
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// script special case
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// the contents of the script block must be ONE token
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// for this to work.
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$html .= $this->generateFromToken($tokens[$i++]);
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$html .= $this->generateScriptFromToken($tokens[$i++]);
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}
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$html .= $this->generateFromToken($tokens[$i]);
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}
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// Tidy cleanup
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if (extension_loaded('tidy') && $this->config->get('Output.TidyFormat')) {
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$tidy = new Tidy;
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$tidy->parseString(
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$html,
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array(
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'indent'=> true,
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'output-xhtml' => $this->_xhtml,
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'show-body-only' => true,
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'indent-spaces' => 2,
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'wrap' => 68,
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),
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'utf8'
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);
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$tidy->cleanRepair();
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$html = (string) $tidy; // explicit cast necessary
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}
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// Normalize newlines to system defined value
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if ($this->config->get('Core.NormalizeNewlines')) {
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$nl = $this->config->get('Output.Newline');
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if ($nl === null) {
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$nl = PHP_EOL;
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}
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if ($nl !== "\n") {
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$html = str_replace("\n", $nl, $html);
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}
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}
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return $html;
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}
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/**
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* Generates HTML from a single token.
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* @param HTMLPurifier_Token $token HTMLPurifier_Token object.
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* @return string Generated HTML
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*/
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public function generateFromToken($token)
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{
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if (!$token instanceof HTMLPurifier_Token) {
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trigger_error('Cannot generate HTML from non-HTMLPurifier_Token object', E_USER_WARNING);
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return '';
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} elseif ($token instanceof HTMLPurifier_Token_Start) {
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$attr = $this->generateAttributes($token->attr, $token->name);
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if ($this->_flashCompat) {
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if ($token->name == "object") {
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$flash = new stdclass();
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$flash->attr = $token->attr;
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$flash->param = array();
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$this->_flashStack[] = $flash;
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}
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}
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return '<' . $token->name . ($attr ? ' ' : '') . $attr . '>';
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} elseif ($token instanceof HTMLPurifier_Token_End) {
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$_extra = '';
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if ($this->_flashCompat) {
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if ($token->name == "object" && !empty($this->_flashStack)) {
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// doesn't do anything for now
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}
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}
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return $_extra . '</' . $token->name . '>';
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} elseif ($token instanceof HTMLPurifier_Token_Empty) {
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if ($this->_flashCompat && $token->name == "param" && !empty($this->_flashStack)) {
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$this->_flashStack[count($this->_flashStack)-1]->param[$token->attr['name']] = $token->attr['value'];
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}
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$attr = $this->generateAttributes($token->attr, $token->name);
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return '<' . $token->name . ($attr ? ' ' : '') . $attr .
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( $this->_xhtml ? ' /': '' ) // <br /> v. <br>
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. '>';
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} elseif ($token instanceof HTMLPurifier_Token_Text) {
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return $this->escape($token->data, ENT_NOQUOTES);
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} elseif ($token instanceof HTMLPurifier_Token_Comment) {
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return '<!--' . $token->data . '-->';
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} else {
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return '';
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}
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}
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/**
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* Special case processor for the contents of script tags
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* @param HTMLPurifier_Token $token HTMLPurifier_Token object.
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* @return string
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* @warning This runs into problems if there's already a literal
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* --> somewhere inside the script contents.
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*/
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public function generateScriptFromToken($token)
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{
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if (!$token instanceof HTMLPurifier_Token_Text) {
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return $this->generateFromToken($token);
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}
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// Thanks <http://lachy.id.au/log/2005/05/script-comments>
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$data = preg_replace('#//\s*$#', '', $token->data);
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return '<!--//--><![CDATA[//><!--' . "\n" . trim($data) . "\n" . '//--><!]]>';
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}
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/**
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* Generates attribute declarations from attribute array.
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* @note This does not include the leading or trailing space.
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* @param array $assoc_array_of_attributes Attribute array
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* @param string $element Name of element attributes are for, used to check
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* attribute minimization.
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* @return string Generated HTML fragment for insertion.
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*/
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public function generateAttributes($assoc_array_of_attributes, $element = '')
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{
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$html = '';
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if ($this->_sortAttr) {
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ksort($assoc_array_of_attributes);
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}
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foreach ($assoc_array_of_attributes as $key => $value) {
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if (!$this->_xhtml) {
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// Remove namespaced attributes
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if (strpos($key, ':') !== false) {
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continue;
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}
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// Check if we should minimize the attribute: val="val" -> val
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if ($element && !empty($this->_def->info[$element]->attr[$key]->minimized)) {
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$html .= $key . ' ';
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continue;
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}
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}
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// Workaround for Internet Explorer innerHTML bug.
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// Essentially, Internet Explorer, when calculating
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// innerHTML, omits quotes if there are no instances of
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// angled brackets, quotes or spaces. However, when parsing
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// HTML (for example, when you assign to innerHTML), it
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// treats backticks as quotes. Thus,
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// <img alt="``" />
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// becomes
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// <img alt=`` />
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// becomes
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// <img alt='' />
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// Fortunately, all we need to do is trigger an appropriate
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// quoting style, which we do by adding an extra space.
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// This also is consistent with the W3C spec, which states
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// that user agents may ignore leading or trailing
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// whitespace (in fact, most don't, at least for attributes
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// like alt, but an extra space at the end is barely
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// noticeable). Still, we have a configuration knob for
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// this, since this transformation is not necesary if you
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// don't process user input with innerHTML or you don't plan
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// on supporting Internet Explorer.
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if ($this->_innerHTMLFix) {
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if (strpos($value, '`') !== false) {
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// check if correct quoting style would not already be
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// triggered
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if (strcspn($value, '"\' <>') === strlen($value)) {
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// protect!
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$value .= ' ';
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}
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}
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}
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$html .= $key.'="'.$this->escape($value).'" ';
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}
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return rtrim($html);
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}
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/**
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* Escapes raw text data.
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* @todo This really ought to be protected, but until we have a facility
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* for properly generating HTML here w/o using tokens, it stays
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* public.
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* @param string $string String data to escape for HTML.
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* @param int $quote Quoting style, like htmlspecialchars. ENT_NOQUOTES is
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* permissible for non-attribute output.
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* @return string escaped data.
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*/
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public function escape($string, $quote = null)
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{
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// Workaround for APC bug on Mac Leopard reported by sidepodcast
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// http://htmlpurifier.org/phorum/read.php?3,4823,4846
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if ($quote === null) {
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$quote = ENT_COMPAT;
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}
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return htmlspecialchars($string, $quote, 'UTF-8');
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}
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}
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// vim: et sw=4 sts=4
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