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<?php
/**
* Generates HTML from tokens.
* @todo Refactor interface so that configuration/context is determined
* upon instantiation, no need for messy generateFromTokens() calls
* @todo Make some of the more internal functions protected, and have
* unit tests work around that
*/
class HTMLPurifier_Generator
{
/**
* Whether or not generator should produce XML output
*/
private $_xhtml = true;
/**
* :HACK: Whether or not generator should comment the insides of <script> tags
*/
private $_scriptFix = false;
/**
* Cache of HTMLDefinition during HTML output to determine whether or
* not attributes should be minimized.
*/
private $_def;
/**
* Cache of %Output.SortAttr
*/
private $_sortAttr;
/**
* Configuration for the generator
*/
protected $config;
/**
* @param $config Instance of HTMLPurifier_Config
* @param $context Instance of HTMLPurifier_Context
*/
public function __construct($config, $context) {
$this->config = $config;
$this->_scriptFix = $config->get('Output', 'CommentScriptContents');
$this->_sortAttr = $config->get('Output', 'SortAttr');
$this->_def = $config->getHTMLDefinition();
$this->_xhtml = $this->_def->doctype->xml;
}
/**
* Generates HTML from an array of tokens.
* @param $tokens Array of HTMLPurifier_Token
* @param $config HTMLPurifier_Config object
* @return Generated HTML
*/
public function generateFromTokens($tokens) {
if (!$tokens) return '';
// Basic algorithm
$html = '';
for ($i = 0, $size = count($tokens); $i < $size; $i++) {
if ($this->_scriptFix && $tokens[$i]->name === 'script'
&& $i + 2 < $size && $tokens[$i+2] instanceof HTMLPurifier_Token_End) {
// script special case
// the contents of the script block must be ONE token
// for this to work.
$html .= $this->generateFromToken($tokens[$i++]);
$html .= $this->generateScriptFromToken($tokens[$i++]);
}
$html .= $this->generateFromToken($tokens[$i]);
}
// Tidy cleanup
if (extension_loaded('tidy') && $this->config->get('Output', 'TidyFormat')) {
$tidy = new Tidy;
$tidy->parseString($html, array(
'indent'=> true,
'output-xhtml' => $this->_xhtml,
'show-body-only' => true,
'indent-spaces' => 2,
'wrap' => 68,
), 'utf8');
$tidy->cleanRepair();
$html = (string) $tidy; // explicit cast necessary
}
// Normalize newlines to system defined value
$nl = $this->config->get('Output', 'Newline');
if ($nl === null) $nl = PHP_EOL;
if ($nl !== "\n") $html = str_replace("\n", $nl, $html);
return $html;
}
/**
* Generates HTML from a single token.
* @param $token HTMLPurifier_Token object.
* @return Generated HTML
*/
public function generateFromToken($token) {
if (!$token instanceof HTMLPurifier_Token) {
trigger_error('Cannot generate HTML from non-HTMLPurifier_Token object', E_USER_WARNING);
return '';
} elseif ($token instanceof HTMLPurifier_Token_Start) {
$attr = $this->generateAttributes($token->attr, $token->name);
return '<' . $token->name . ($attr ? ' ' : '') . $attr . '>';
} elseif ($token instanceof HTMLPurifier_Token_End) {
return '</' . $token->name . '>';
} elseif ($token instanceof HTMLPurifier_Token_Empty) {
$attr = $this->generateAttributes($token->attr, $token->name);
return '<' . $token->name . ($attr ? ' ' : '') . $attr .
( $this->_xhtml ? ' /': '' ) // <br /> v. <br>
. '>';
} elseif ($token instanceof HTMLPurifier_Token_Text) {
return $this->escape($token->data, ENT_NOQUOTES);
} elseif ($token instanceof HTMLPurifier_Token_Comment) {
return '<!--' . $token->data . '-->';
} else {
return '';
}
}
/**
* Special case processor for the contents of script tags
* @warning This runs into problems if there's already a literal
* --> somewhere inside the script contents.
*/
public function generateScriptFromToken($token) {
if (!$token instanceof HTMLPurifier_Token_Text) return $this->generateFromToken($token);
// Thanks <http://lachy.id.au/log/2005/05/script-comments>
$data = preg_replace('#//\s*$#', '', $token->data);
return '<!--//--><![CDATA[//><!--' . "\n" . trim($data) . "\n" . '//--><!]]>';
}
/**
* Generates attribute declarations from attribute array.
* @note This does not include the leading or trailing space.
* @param $assoc_array_of_attributes Attribute array
* @param $element Name of element attributes are for, used to check
* attribute minimization.
* @return Generate HTML fragment for insertion.
*/
public function generateAttributes($assoc_array_of_attributes, $element = false) {
$html = '';
if ($this->_sortAttr) ksort($assoc_array_of_attributes);
foreach ($assoc_array_of_attributes as $key => $value) {
if (!$this->_xhtml) {
// Remove namespaced attributes
if (strpos($key, ':') !== false) continue;
// Check if we should minimize the attribute: val="val" -> val
if ($element && !empty($this->_def->info[$element]->attr[$key]->minimized)) {
$html .= $key . ' ';
continue;
}
}
$html .= $key.'="'.$this->escape($value).'" ';
}
return rtrim($html);
}
/**
* Escapes raw text data.
* @todo This really ought to be protected, but until we have a facility
* for properly generating HTML here w/o using tokens, it stays
* public.
* @param $string String data to escape for HTML.
* @param $quote Quoting style, like htmlspecialchars. ENT_NOQUOTES is
* permissible for non-attribute output.
* @return String escaped data.
*/
public function escape($string, $quote = ENT_COMPAT) {
return htmlspecialchars($string, $quote, 'UTF-8');
}
}
// vim: et sw=4 sts=4