Generates HTML from a single token.
| public generateFromToken ( HTMLPurifier_Token $token ) : string | ||
| $token | HTMLPurifier_Token | HTMLPurifier_Token object. |
| return | string | Generated HTML |
function execute($tokens, $config, &$context)
{
$definition = $config->getHTMLDefinition();
$generator = new HTMLPurifier_Generator();
$result = array();
$escape_invalid_tags = $config->get('Core', 'EscapeInvalidTags');
$remove_invalid_img = $config->get('Core', 'RemoveInvalidImg');
$remove_script_contents = $config->get('Core', 'RemoveScriptContents');
$hidden_elements = $config->get('Core', 'HiddenElements');
// remove script contents compatibility
if ($remove_script_contents === true) {
$hidden_elements['script'] = true;
} elseif ($remove_script_contents === false && isset($hidden_elements['script'])) {
unset($hidden_elements['script']);
}
$attr_validator = new HTMLPurifier_AttrValidator();
// removes tokens until it reaches a closing tag with its value
$remove_until = false;
// converts comments into text tokens when this is equal to a tag name
$textify_comments = false;
$token = false;
$context->register('CurrentToken', $token);
$e = false;
if ($config->get('Core', 'CollectErrors')) {
$e =& $context->get('ErrorCollector');
}
foreach ($tokens as $token) {
if ($remove_until) {
if (empty($token->is_tag) || $token->name !== $remove_until) {
continue;
}
}
if (!empty($token->is_tag)) {
// DEFINITION CALL
// before any processing, try to transform the element
if (isset($definition->info_tag_transform[$token->name])) {
$original_name = $token->name;
// there is a transformation for this tag
// DEFINITION CALL
$token = $definition->info_tag_transform[$token->name]->transform($token, $config, $context);
if ($e) {
$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Tag transform', $original_name);
}
}
if (isset($definition->info[$token->name])) {
// mostly everything's good, but
// we need to make sure required attributes are in order
if (($token->type === 'start' || $token->type === 'empty') && $definition->info[$token->name]->required_attr && ($token->name != 'img' || $remove_invalid_img)) {
$attr_validator->validateToken($token, $config, $context);
$ok = true;
foreach ($definition->info[$token->name]->required_attr as $name) {
if (!isset($token->attr[$name])) {
$ok = false;
break;
}
}
if (!$ok) {
if ($e) {
$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Missing required attribute', $name);
}
continue;
}
$token->armor['ValidateAttributes'] = true;
}
if (isset($hidden_elements[$token->name]) && $token->type == 'start') {
$textify_comments = $token->name;
} elseif ($token->name === $textify_comments && $token->type == 'end') {
$textify_comments = false;
}
} elseif ($escape_invalid_tags) {
// invalid tag, generate HTML representation and insert in
if ($e) {
$e->send(E_WARNING, 'Strategy_RemoveForeignElements: Foreign element to text');
}
$token = new HTMLPurifier_Token_Text($generator->generateFromToken($token, $config, $context));
} else {
// check if we need to destroy all of the tag's children
// CAN BE GENERICIZED
if (isset($hidden_elements[$token->name])) {
if ($token->type == 'start') {
$remove_until = $token->name;
} elseif ($token->type == 'empty') {
// do nothing: we're still looking
} else {
$remove_until = false;
}
if ($e) {
$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Foreign meta element removed');
}
} else {
if ($e) {
$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Foreign element removed');
}
}
continue;
}
} elseif ($token->type == 'comment') {
// textify comments in script tags when they are allowed
if ($textify_comments !== false) {
$data = $token->data;
$token = new HTMLPurifier_Token_Text($data);
} else {
// strip comments
if ($e) {
$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Comment removed');
}
continue;
}
} elseif ($token->type == 'text') {
} else {
continue;
}
$result[] = $token;
}
if ($remove_until && $e) {
// we removed tokens until the end, throw error
$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Token removed to end', $remove_until);
}
$context->destroy('CurrentToken');
return $result;
}
/**
* @param HTMLPurifier_Token[] $tokens
* @param HTMLPurifier_Config $config
* @param HTMLPurifier_Context $context
* @return array|HTMLPurifier_Token[]
*/
public function execute($tokens, $config, $context)
{
$definition = $config->getHTMLDefinition();
$generator = new HTMLPurifier_Generator($config, $context);
$result = array();
$escape_invalid_tags = $config->get('Core.EscapeInvalidTags');
$remove_invalid_img = $config->get('Core.RemoveInvalidImg');
// currently only used to determine if comments should be kept
$trusted = $config->get('HTML.Trusted');
$comment_lookup = $config->get('HTML.AllowedComments');
$comment_regexp = $config->get('HTML.AllowedCommentsRegexp');
$check_comments = $comment_lookup !== array() || $comment_regexp !== null;
$remove_script_contents = $config->get('Core.RemoveScriptContents');
$hidden_elements = $config->get('Core.HiddenElements');
// remove script contents compatibility
if ($remove_script_contents === true) {
$hidden_elements['script'] = true;
} elseif ($remove_script_contents === false && isset($hidden_elements['script'])) {
unset($hidden_elements['script']);
}
$attr_validator = new HTMLPurifier_AttrValidator();
// removes tokens until it reaches a closing tag with its value
$remove_until = false;
// converts comments into text tokens when this is equal to a tag name
$textify_comments = false;
$token = false;
$context->register('CurrentToken', $token);
$e = false;
if ($config->get('Core.CollectErrors')) {
$e =& $context->get('ErrorCollector');
}
foreach ($tokens as $token) {
if ($remove_until) {
if (empty($token->is_tag) || $token->name !== $remove_until) {
continue;
}
}
if (!empty($token->is_tag)) {
// DEFINITION CALL
// before any processing, try to transform the element
if (isset($definition->info_tag_transform[$token->name])) {
$original_name = $token->name;
// there is a transformation for this tag
// DEFINITION CALL
$token = $definition->info_tag_transform[$token->name]->transform($token, $config, $context);
if ($e) {
$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Tag transform', $original_name);
}
}
if (isset($definition->info[$token->name])) {
// mostly everything's good, but
// we need to make sure required attributes are in order
if (($token instanceof HTMLPurifier_Token_Start || $token instanceof HTMLPurifier_Token_Empty) && $definition->info[$token->name]->required_attr && ($token->name != 'img' || $remove_invalid_img)) {
$attr_validator->validateToken($token, $config, $context);
$ok = true;
foreach ($definition->info[$token->name]->required_attr as $name) {
if (!isset($token->attr[$name])) {
$ok = false;
break;
}
}
if (!$ok) {
if ($e) {
$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Missing required attribute', $name);
}
continue;
}
$token->armor['ValidateAttributes'] = true;
}
if (isset($hidden_elements[$token->name]) && $token instanceof HTMLPurifier_Token_Start) {
$textify_comments = $token->name;
} elseif ($token->name === $textify_comments && $token instanceof HTMLPurifier_Token_End) {
$textify_comments = false;
}
} elseif ($escape_invalid_tags) {
// invalid tag, generate HTML representation and insert in
if ($e) {
$e->send(E_WARNING, 'Strategy_RemoveForeignElements: Foreign element to text');
}
$token = new HTMLPurifier_Token_Text($generator->generateFromToken($token));
} else {
// check if we need to destroy all of the tag's children
// CAN BE GENERICIZED
if (isset($hidden_elements[$token->name])) {
if ($token instanceof HTMLPurifier_Token_Start) {
$remove_until = $token->name;
} elseif ($token instanceof HTMLPurifier_Token_Empty) {
// do nothing: we're still looking
} else {
$remove_until = false;
}
if ($e) {
$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Foreign meta element removed');
}
} else {
if ($e) {
$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Foreign element removed');
}
}
continue;
}
} elseif ($token instanceof HTMLPurifier_Token_Comment) {
// textify comments in script tags when they are allowed
if ($textify_comments !== false) {
$data = $token->data;
$token = new HTMLPurifier_Token_Text($data);
} elseif ($trusted || $check_comments) {
// always cleanup comments
$trailing_hyphen = false;
if ($e) {
// perform check whether or not there's a trailing hyphen
if (substr($token->data, -1) == '-') {
$trailing_hyphen = true;
}
}
$token->data = rtrim($token->data, '-');
$found_double_hyphen = false;
while (strpos($token->data, '--') !== false) {
$found_double_hyphen = true;
$token->data = str_replace('--', '-', $token->data);
}
if ($trusted || !empty($comment_lookup[trim($token->data)]) || $comment_regexp !== null && preg_match($comment_regexp, trim($token->data))) {
// OK good
if ($e) {
if ($trailing_hyphen) {
$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Trailing hyphen in comment removed');
}
if ($found_double_hyphen) {
$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Hyphens in comment collapsed');
}
}
} else {
if ($e) {
$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Comment removed');
}
continue;
}
} else {
// strip comments
if ($e) {
$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Comment removed');
}
continue;
}
} elseif ($token instanceof HTMLPurifier_Token_Text) {
} else {
continue;
}
$result[] = $token;
}
if ($remove_until && $e) {
// we removed tokens until the end, throw error
$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Token removed to end', $remove_until);
}
$context->destroy('CurrentToken');
return $result;
}
public function execute($tokens, $config, $context)
{
$definition = $config->getHTMLDefinition();
// local variables
$generator = new HTMLPurifier_Generator($config, $context);
$escape_invalid_tags = $config->get('Core.EscapeInvalidTags');
$e = $context->get('ErrorCollector', true);
$t = false;
// token index
$i = false;
// injector index
$token = false;
// the current token
$reprocess = false;
// whether or not to reprocess the same token
$stack = array();
// member variables
$this->stack =& $stack;
$this->t =& $t;
$this->tokens =& $tokens;
$this->config = $config;
$this->context = $context;
// context variables
$context->register('CurrentNesting', $stack);
$context->register('InputIndex', $t);
$context->register('InputTokens', $tokens);
$context->register('CurrentToken', $token);
// -- begin INJECTOR --
$this->injectors = array();
$injectors = $config->getBatch('AutoFormat');
$def_injectors = $definition->info_injector;
$custom_injectors = $injectors['Custom'];
unset($injectors['Custom']);
// special case
foreach ($injectors as $injector => $b) {
// XXX: Fix with a legitimate lookup table of enabled filters
if (strpos($injector, '.') !== false) {
continue;
}
$injector = "HTMLPurifier_Injector_{$injector}";
if (!$b) {
continue;
}
$this->injectors[] = new $injector();
}
foreach ($def_injectors as $injector) {
// assumed to be objects
$this->injectors[] = $injector;
}
foreach ($custom_injectors as $injector) {
if (is_string($injector)) {
$injector = "HTMLPurifier_Injector_{$injector}";
$injector = new $injector();
}
$this->injectors[] = $injector;
}
// give the injectors references to the definition and context
// variables for performance reasons
foreach ($this->injectors as $ix => $injector) {
$error = $injector->prepare($config, $context);
if (!$error) {
continue;
}
array_splice($this->injectors, $ix, 1);
// rm the injector
trigger_error("Cannot enable {$injector->name} injector because {$error} is not allowed", E_USER_WARNING);
}
// -- end INJECTOR --
// a note on punting:
// In order to reduce code duplication, whenever some code needs
// to make HTML changes in order to make things "correct", the
// new HTML gets sent through the purifier, regardless of its
// status. This means that if we add a start token, because it
// was totally necessary, we don't have to update nesting; we just
// punt ($reprocess = true; continue;) and it does that for us.
// isset is in loop because $tokens size changes during loop exec
for ($t = 0; $t == 0 || isset($tokens[$t - 1]); $reprocess ? $reprocess = false : $t++) {
// check for a rewind
if (is_int($i) && $i >= 0) {
// possibility: disable rewinding if the current token has a
// rewind set on it already. This would offer protection from
// infinite loop, but might hinder some advanced rewinding.
$rewind_to = $this->injectors[$i]->getRewind();
if (is_int($rewind_to) && $rewind_to < $t) {
if ($rewind_to < 0) {
$rewind_to = 0;
}
while ($t > $rewind_to) {
$t--;
$prev = $tokens[$t];
// indicate that other injectors should not process this token,
// but we need to reprocess it
unset($prev->skip[$i]);
$prev->rewind = $i;
if ($prev instanceof HTMLPurifier_Token_Start) {
array_pop($this->stack);
} elseif ($prev instanceof HTMLPurifier_Token_End) {
$this->stack[] = $prev->start;
}
}
}
$i = false;
}
// handle case of document end
if (!isset($tokens[$t])) {
// kill processing if stack is empty
if (empty($this->stack)) {
break;
}
// peek
$top_nesting = array_pop($this->stack);
$this->stack[] = $top_nesting;
// send error
if ($e && !isset($top_nesting->armor['MakeWellFormed_TagClosedError'])) {
$e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag closed by document end', $top_nesting);
}
// append, don't splice, since this is the end
$tokens[] = new HTMLPurifier_Token_End($top_nesting->name);
// punt!
$reprocess = true;
continue;
}
$token = $tokens[$t];
//echo '<br>'; printTokens($tokens, $t); printTokens($this->stack);
// quick-check: if it's not a tag, no need to process
if (empty($token->is_tag)) {
if ($token instanceof HTMLPurifier_Token_Text) {
foreach ($this->injectors as $i => $injector) {
if (isset($token->skip[$i])) {
continue;
}
if ($token->rewind !== null && $token->rewind !== $i) {
continue;
}
$injector->handleText($token);
$this->processToken($token, $i);
$reprocess = true;
break;
}
}
// another possibility is a comment
continue;
}
if (isset($definition->info[$token->name])) {
$type = $definition->info[$token->name]->child->type;
} else {
$type = false;
// Type is unknown, treat accordingly
}
// quick tag checks: anything that's *not* an end tag
$ok = false;
if ($type === 'empty' && $token instanceof HTMLPurifier_Token_Start) {
// claims to be a start tag but is empty
$token = new HTMLPurifier_Token_Empty($token->name, $token->attr);
$ok = true;
} elseif ($type && $type !== 'empty' && $token instanceof HTMLPurifier_Token_Empty) {
// claims to be empty but really is a start tag
$this->swap(new HTMLPurifier_Token_End($token->name));
$this->insertBefore(new HTMLPurifier_Token_Start($token->name, $token->attr));
// punt (since we had to modify the input stream in a non-trivial way)
$reprocess = true;
continue;
} elseif ($token instanceof HTMLPurifier_Token_Empty) {
// real empty token
$ok = true;
} elseif ($token instanceof HTMLPurifier_Token_Start) {
// start tag
// ...unless they also have to close their parent
if (!empty($this->stack)) {
$parent = array_pop($this->stack);
$this->stack[] = $parent;
if (isset($definition->info[$parent->name])) {
$elements = $definition->info[$parent->name]->child->getAllowedElements($config);
$autoclose = !isset($elements[$token->name]);
} else {
$autoclose = false;
}
$carryover = false;
if ($autoclose && $definition->info[$parent->name]->formatting) {
$carryover = true;
}
if ($autoclose) {
// errors need to be updated
$new_token = new HTMLPurifier_Token_End($parent->name);
$new_token->start = $parent;
if ($carryover) {
$element = clone $parent;
$element->armor['MakeWellFormed_TagClosedError'] = true;
$element->carryover = true;
$this->processToken(array($new_token, $token, $element));
} else {
$this->insertBefore($new_token);
}
if ($e && !isset($parent->armor['MakeWellFormed_TagClosedError'])) {
if (!$carryover) {
$e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag auto closed', $parent);
} else {
$e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag carryover', $parent);
}
}
$reprocess = true;
continue;
}
}
$ok = true;
}
if ($ok) {
foreach ($this->injectors as $i => $injector) {
if (isset($token->skip[$i])) {
continue;
}
if ($token->rewind !== null && $token->rewind !== $i) {
continue;
}
$injector->handleElement($token);
$this->processToken($token, $i);
$reprocess = true;
break;
}
if (!$reprocess) {
// ah, nothing interesting happened; do normal processing
$this->swap($token);
if ($token instanceof HTMLPurifier_Token_Start) {
$this->stack[] = $token;
} elseif ($token instanceof HTMLPurifier_Token_End) {
throw new HTMLPurifier_Exception('Improper handling of end tag in start code; possible error in MakeWellFormed');
}
}
continue;
}
// sanity check: we should be dealing with a closing tag
if (!$token instanceof HTMLPurifier_Token_End) {
throw new HTMLPurifier_Exception('Unaccounted for tag token in input stream, bug in HTML Purifier');
}
// make sure that we have something open
if (empty($this->stack)) {
if ($escape_invalid_tags) {
if ($e) {
$e->send(E_WARNING, 'Strategy_MakeWellFormed: Unnecessary end tag to text');
}
$this->swap(new HTMLPurifier_Token_Text($generator->generateFromToken($token)));
} else {
$this->remove();
if ($e) {
$e->send(E_WARNING, 'Strategy_MakeWellFormed: Unnecessary end tag removed');
}
}
$reprocess = true;
continue;
}
// first, check for the simplest case: everything closes neatly.
// Eventually, everything passes through here; if there are problems
// we modify the input stream accordingly and then punt, so that
// the tokens get processed again.
$current_parent = array_pop($this->stack);
if ($current_parent->name == $token->name) {
$token->start = $current_parent;
foreach ($this->injectors as $i => $injector) {
if (isset($token->skip[$i])) {
continue;
}
if ($token->rewind !== null && $token->rewind !== $i) {
continue;
}
$injector->handleEnd($token);
$this->processToken($token, $i);
$this->stack[] = $current_parent;
$reprocess = true;
break;
}
continue;
}
// okay, so we're trying to close the wrong tag
// undo the pop previous pop
$this->stack[] = $current_parent;
// scroll back the entire nest, trying to find our tag.
// (feature could be to specify how far you'd like to go)
$size = count($this->stack);
// -2 because -1 is the last element, but we already checked that
$skipped_tags = false;
for ($j = $size - 2; $j >= 0; $j--) {
if ($this->stack[$j]->name == $token->name) {
$skipped_tags = array_slice($this->stack, $j);
break;
}
}
// we didn't find the tag, so remove
if ($skipped_tags === false) {
if ($escape_invalid_tags) {
$this->swap(new HTMLPurifier_Token_Text($generator->generateFromToken($token)));
if ($e) {
$e->send(E_WARNING, 'Strategy_MakeWellFormed: Stray end tag to text');
}
} else {
$this->remove();
if ($e) {
$e->send(E_WARNING, 'Strategy_MakeWellFormed: Stray end tag removed');
}
}
$reprocess = true;
continue;
}
// do errors, in REVERSE $j order: a,b,c with </a></b></c>
$c = count($skipped_tags);
if ($e) {
for ($j = $c - 1; $j > 0; $j--) {
// notice we exclude $j == 0, i.e. the current ending tag, from
// the errors...
if (!isset($skipped_tags[$j]->armor['MakeWellFormed_TagClosedError'])) {
$e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag closed by element end', $skipped_tags[$j]);
}
}
}
// insert tags, in FORWARD $j order: c,b,a with </a></b></c>
$replace = array($token);
for ($j = 1; $j < $c; $j++) {
// ...as well as from the insertions
$new_token = new HTMLPurifier_Token_End($skipped_tags[$j]->name);
$new_token->start = $skipped_tags[$j];
array_unshift($replace, $new_token);
if (isset($definition->info[$new_token->name]) && $definition->info[$new_token->name]->formatting) {
$element = clone $skipped_tags[$j];
$element->carryover = true;
$element->armor['MakeWellFormed_TagClosedError'] = true;
$replace[] = $element;
}
}
$this->processToken($replace);
$reprocess = true;
continue;
}
$context->destroy('CurrentNesting');
$context->destroy('InputTokens');
$context->destroy('InputIndex');
$context->destroy('CurrentToken');
unset($this->injectors, $this->stack, $this->tokens, $this->t);
return $tokens;
}
public function execute($tokens, $config, $context)
{
$definition = $config->getHTMLDefinition();
// local variables
$result = array();
$generator = new HTMLPurifier_Generator();
$escape_invalid_tags = $config->get('Core', 'EscapeInvalidTags');
$e = $context->get('ErrorCollector', true);
// member variables
$this->currentNesting = array();
$this->inputIndex = false;
$this->inputTokens =& $tokens;
$this->outputTokens =& $result;
// context variables
$context->register('CurrentNesting', $this->currentNesting);
$context->register('InputIndex', $this->inputIndex);
$context->register('InputTokens', $tokens);
// -- begin INJECTOR --
$this->injectors = array();
$injectors = $config->getBatch('AutoFormat');
$custom_injectors = $injectors['Custom'];
unset($injectors['Custom']);
// special case
foreach ($injectors as $injector => $b) {
$injector = "HTMLPurifier_Injector_{$injector}";
if (!$b) {
continue;
}
$this->injectors[] = new $injector();
}
foreach ($custom_injectors as $injector) {
if (is_string($injector)) {
$injector = "HTMLPurifier_Injector_{$injector}";
$injector = new $injector();
}
$this->injectors[] = $injector;
}
// array index of the injector that resulted in an array
// substitution. This enables processTokens() to know which
// injectors are affected by the added tokens and which are
// not (namely, the ones after the current injector are not
// affected)
$this->currentInjector = false;
// give the injectors references to the definition and context
// variables for performance reasons
foreach ($this->injectors as $i => $injector) {
$error = $injector->prepare($config, $context);
if (!$error) {
continue;
}
array_splice($this->injectors, $i, 1);
// rm the injector
trigger_error("Cannot enable {$injector->name} injector because {$error} is not allowed", E_USER_WARNING);
}
// warning: most foreach loops follow the convention $i => $injector.
// Don't define these as loop-wide variables, please!
// -- end INJECTOR --
$token = false;
$context->register('CurrentToken', $token);
// isset is in loop because $tokens size changes during loop exec
for ($this->inputIndex = 0; isset($tokens[$this->inputIndex]); $this->inputIndex++) {
// if all goes well, this token will be passed through unharmed
$token = $tokens[$this->inputIndex];
//printTokens($tokens, $this->inputIndex);
foreach ($this->injectors as $injector) {
if ($injector->skip > 0) {
$injector->skip--;
}
}
// quick-check: if it's not a tag, no need to process
if (empty($token->is_tag)) {
if ($token->type === 'text') {
// injector handler code; duplicated for performance reasons
foreach ($this->injectors as $i => $injector) {
if (!$injector->skip) {
$injector->handleText($token);
}
if (is_array($token)) {
$this->currentInjector = $i;
break;
}
}
}
$this->processToken($token, $config, $context);
continue;
}
$info = $definition->info[$token->name]->child;
// quick tag checks: anything that's *not* an end tag
$ok = false;
if ($info->type == 'empty' && $token->type == 'start') {
// test if it claims to be a start tag but is empty
$token = new HTMLPurifier_Token_Empty($token->name, $token->attr);
$ok = true;
} elseif ($info->type != 'empty' && $token->type == 'empty') {
// claims to be empty but really is a start tag
$token = array(new HTMLPurifier_Token_Start($token->name, $token->attr), new HTMLPurifier_Token_End($token->name));
$ok = true;
} elseif ($token->type == 'empty') {
// real empty token
$ok = true;
} elseif ($token->type == 'start') {
// start tag
// ...unless they also have to close their parent
if (!empty($this->currentNesting)) {
$parent = array_pop($this->currentNesting);
$parent_info = $definition->info[$parent->name];
// this can be replaced with a more general algorithm:
// if the token is not allowed by the parent, auto-close
// the parent
if (!isset($parent_info->child->elements[$token->name])) {
if ($e) {
$e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag auto closed', $parent);
}
// close the parent, then append the token
$result[] = new HTMLPurifier_Token_End($parent->name);
$result[] = $token;
$this->currentNesting[] = $token;
continue;
}
$this->currentNesting[] = $parent;
// undo the pop
}
$ok = true;
}
// injector handler code; duplicated for performance reasons
if ($ok) {
foreach ($this->injectors as $i => $injector) {
if (!$injector->skip) {
$injector->handleElement($token);
}
if (is_array($token)) {
$this->currentInjector = $i;
break;
}
}
$this->processToken($token, $config, $context);
continue;
}
// sanity check: we should be dealing with a closing tag
if ($token->type != 'end') {
continue;
}
// make sure that we have something open
if (empty($this->currentNesting)) {
if ($escape_invalid_tags) {
if ($e) {
$e->send(E_WARNING, 'Strategy_MakeWellFormed: Unnecessary end tag to text');
}
$result[] = new HTMLPurifier_Token_Text($generator->generateFromToken($token, $config, $context));
} elseif ($e) {
$e->send(E_WARNING, 'Strategy_MakeWellFormed: Unnecessary end tag removed');
}
continue;
}
// first, check for the simplest case: everything closes neatly
$current_parent = array_pop($this->currentNesting);
if ($current_parent->name == $token->name) {
$result[] = $token;
foreach ($this->injectors as $i => $injector) {
$injector->notifyEnd($token);
}
continue;
}
// okay, so we're trying to close the wrong tag
// undo the pop previous pop
$this->currentNesting[] = $current_parent;
// scroll back the entire nest, trying to find our tag.
// (feature could be to specify how far you'd like to go)
$size = count($this->currentNesting);
// -2 because -1 is the last element, but we already checked that
$skipped_tags = false;
for ($i = $size - 2; $i >= 0; $i--) {
if ($this->currentNesting[$i]->name == $token->name) {
// current nesting is modified
$skipped_tags = array_splice($this->currentNesting, $i);
break;
}
}
// we still didn't find the tag, so remove
if ($skipped_tags === false) {
if ($escape_invalid_tags) {
$result[] = new HTMLPurifier_Token_Text($generator->generateFromToken($token, $config, $context));
if ($e) {
$e->send(E_WARNING, 'Strategy_MakeWellFormed: Stray end tag to text');
}
} elseif ($e) {
$e->send(E_WARNING, 'Strategy_MakeWellFormed: Stray end tag removed');
}
continue;
}
// okay, we found it, close all the skipped tags
// note that skipped tags contains the element we need closed
for ($i = count($skipped_tags) - 1; $i >= 0; $i--) {
// please don't redefine $i!
if ($i && $e && !isset($skipped_tags[$i]->armor['MakeWellFormed_TagClosedError'])) {
$e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag closed by element end', $skipped_tags[$i]);
}
$result[] = $new_token = new HTMLPurifier_Token_End($skipped_tags[$i]->name);
foreach ($this->injectors as $injector) {
$injector->notifyEnd($new_token);
}
}
}
$context->destroy('CurrentNesting');
$context->destroy('InputTokens');
$context->destroy('InputIndex');
$context->destroy('CurrentToken');
// we're at the end now, fix all still unclosed tags (this is
// duplicated from the end of the loop with some slight modifications)
// not using $skipped_tags since it would invariably be all of them
if (!empty($this->currentNesting)) {
for ($i = count($this->currentNesting) - 1; $i >= 0; $i--) {
// please don't redefine $i!
if ($e && !isset($this->currentNesting[$i]->armor['MakeWellFormed_TagClosedError'])) {
$e->send(E_NOTICE, 'Strategy_MakeWellFormed: Tag closed by document end', $this->currentNesting[$i]);
}
$result[] = $new_token = new HTMLPurifier_Token_End($this->currentNesting[$i]->name);
foreach ($this->injectors as $injector) {
$injector->notifyEnd($new_token);
}
}
}
unset($this->outputTokens, $this->injectors, $this->currentInjector, $this->currentNesting, $this->inputTokens, $this->inputIndex);
return $result;
}
public function validateChildren($tokens_of_children, $config, $context)
{
// Flag for subclasses
$this->whitespace = false;
// if there are no tokens, delete parent node
if (empty($tokens_of_children)) {
return false;
}
// the new set of children
$result = array();
// current depth into the nest
$nesting = 0;
// whether or not we're deleting a node
$is_deleting = false;
// whether or not parsed character data is allowed
// this controls whether or not we silently drop a tag
// or generate escaped HTML from it
$pcdata_allowed = isset($this->elements['#PCDATA']);
// a little sanity check to make sure it's not ALL whitespace
$all_whitespace = true;
// some configuration
$escape_invalid_children = $config->get('Core', 'EscapeInvalidChildren');
// generator
$gen = new HTMLPurifier_Generator($config, $context);
foreach ($tokens_of_children as $token) {
if (!empty($token->is_whitespace)) {
$result[] = $token;
continue;
}
$all_whitespace = false;
// phew, we're not talking about whitespace
$is_child = $nesting == 0;
if ($token instanceof HTMLPurifier_Token_Start) {
$nesting++;
} elseif ($token instanceof HTMLPurifier_Token_End) {
$nesting--;
}
if ($is_child) {
$is_deleting = false;
if (!isset($this->elements[$token->name])) {
$is_deleting = true;
if ($pcdata_allowed && $token instanceof HTMLPurifier_Token_Text) {
$result[] = $token;
} elseif ($pcdata_allowed && $escape_invalid_children) {
$result[] = new HTMLPurifier_Token_Text($gen->generateFromToken($token));
}
continue;
}
}
if (!$is_deleting || $pcdata_allowed && $token instanceof HTMLPurifier_Token_Text) {
$result[] = $token;
} elseif ($pcdata_allowed && $escape_invalid_children) {
$result[] = new HTMLPurifier_Token_Text($gen->generateFromToken($token));
} else {
// drop silently
}
}
if (empty($result)) {
return false;
}
if ($all_whitespace) {
$this->whitespace = true;
return false;
}
if ($tokens_of_children == $result) {
return true;
}
return $result;
}
/**
* Debugging function that prints tokens in a user-friendly manner.
*/
function printTokens($tokens, $index = null)
{
$string = '<pre>';
$generator = new HTMLPurifier_Generator(HTMLPurifier_Config::createDefault(), new HTMLPurifier_Context());
foreach ($tokens as $i => $token) {
if ($index === $i) {
$string .= '[<strong>';
}
$string .= "<sup>{$i}</sup>";
$string .= $generator->escape($generator->generateFromToken($token));
if ($index === $i) {
$string .= '</strong>]';
}
}
$string .= '</pre>';
echo $string;
}
public function execute($tokens, $config, $context)
{
$definition = $config->getHTMLDefinition();
$generator = new HTMLPurifier_Generator($config, $context);
$result = array();
$escape_invalid_tags = $config->get('Core.EscapeInvalidTags');
$remove_invalid_img = $config->get('Core.RemoveInvalidImg');
$trusted = $config->get('HTML.Trusted');
$comment_lookup = $config->get('HTML.AllowedComments');
$comment_regexp = $config->get('HTML.AllowedCommentsRegexp');
$check_comments = $comment_lookup !== array() || $comment_regexp !== null;
$remove_script_contents = $config->get('Core.RemoveScriptContents');
$hidden_elements = $config->get('Core.HiddenElements');
if ($remove_script_contents === true) {
$hidden_elements['script'] = true;
} elseif ($remove_script_contents === false && isset($hidden_elements['script'])) {
unset($hidden_elements['script']);
}
$attr_validator = new HTMLPurifier_AttrValidator();
$remove_until = false;
$textify_comments = false;
$token = false;
$context->register('CurrentToken', $token);
$e = false;
if ($config->get('Core.CollectErrors')) {
$e =& $context->get('ErrorCollector');
}
foreach ($tokens as $token) {
if ($remove_until) {
if (empty($token->is_tag) || $token->name !== $remove_until) {
continue;
}
}
if (!empty($token->is_tag)) {
if (isset($definition->info_tag_transform[$token->name])) {
$original_name = $token->name;
$token = $definition->info_tag_transform[$token->name]->transform($token, $config, $context);
if ($e) {
$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Tag transform', $original_name);
}
}
if (isset($definition->info[$token->name])) {
if (($token instanceof HTMLPurifier_Token_Start || $token instanceof HTMLPurifier_Token_Empty) && $definition->info[$token->name]->required_attr && ($token->name != 'img' || $remove_invalid_img)) {
$attr_validator->validateToken($token, $config, $context);
$ok = true;
foreach ($definition->info[$token->name]->required_attr as $name) {
if (!isset($token->attr[$name])) {
$ok = false;
break;
}
}
if (!$ok) {
if ($e) {
$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Missing required attribute', $name);
}
continue;
}
$token->armor['ValidateAttributes'] = true;
}
if (isset($hidden_elements[$token->name]) && $token instanceof HTMLPurifier_Token_Start) {
$textify_comments = $token->name;
} elseif ($token->name === $textify_comments && $token instanceof HTMLPurifier_Token_End) {
$textify_comments = false;
}
} elseif ($escape_invalid_tags) {
if ($e) {
$e->send(E_WARNING, 'Strategy_RemoveForeignElements: Foreign element to text');
}
$token = new HTMLPurifier_Token_Text($generator->generateFromToken($token));
} else {
if (isset($hidden_elements[$token->name])) {
if ($token instanceof HTMLPurifier_Token_Start) {
$remove_until = $token->name;
} elseif ($token instanceof HTMLPurifier_Token_Empty) {
} else {
$remove_until = false;
}
if ($e) {
$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Foreign meta element removed');
}
} else {
if ($e) {
$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Foreign element removed');
}
}
continue;
}
} elseif ($token instanceof HTMLPurifier_Token_Comment) {
if ($textify_comments !== false) {
$data = $token->data;
$token = new HTMLPurifier_Token_Text($data);
} elseif ($trusted || $check_comments) {
$trailing_hyphen = false;
if ($e) {
if (substr($token->data, -1) == '-') {
$trailing_hyphen = true;
}
}
$token->data = rtrim($token->data, '-');
$found_double_hyphen = false;
while (strpos($token->data, '--') !== false) {
$found_double_hyphen = true;
$token->data = str_replace('--', '-', $token->data);
}
if ($trusted || !empty($comment_lookup[trim($token->data)]) || $comment_regexp !== null && preg_match($comment_regexp, trim($token->data))) {
if ($e) {
if ($trailing_hyphen) {
$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Trailing hyphen in comment removed');
}
if ($found_double_hyphen) {
$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Hyphens in comment collapsed');
}
}
} else {
if ($e) {
$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Comment removed');
}
continue;
}
} else {
if ($e) {
$e->send(E_NOTICE, 'Strategy_RemoveForeignElements: Comment removed');
}
continue;
}
} elseif ($token instanceof HTMLPurifier_Token_Text) {
} else {
continue;
}
$result[] = $token;
}
if ($remove_until && $e) {
$e->send(E_ERROR, 'Strategy_RemoveForeignElements: Token removed to end', $remove_until);
}
$context->destroy('CurrentToken');
return $result;
}