mirror of
https://github.com/ezyang/htmlpurifier.git
synced 2024-12-23 08:51:53 +00:00
35f8b3c801
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1539 48356398-32a2-884e-a903-53898d9a118a
298 lines
13 KiB
PHP
298 lines
13 KiB
PHP
<?php
|
|
|
|
/**
|
|
* Takes tokens makes them well-formed (balance end tags, etc.)
|
|
*/
|
|
class HTMLPurifier_Strategy_MakeWellFormed extends HTMLPurifier_Strategy
|
|
{
|
|
|
|
/**
|
|
* Locally shared variable references
|
|
*/
|
|
protected $inputTokens, $inputIndex, $outputTokens, $currentNesting,
|
|
$currentInjector, $injectors;
|
|
|
|
public function execute($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 instanceof HTMLPurifier_Token_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 instanceof HTMLPurifier_Token_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 instanceof HTMLPurifier_Token_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 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->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 re-loop to reprocess token
|
|
$result[] = new HTMLPurifier_Token_End($parent->name);
|
|
$this->inputIndex--;
|
|
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 instanceof HTMLPurifier_Token_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 $result;
|
|
}
|
|
|
|
function processToken($token, $config, $context) {
|
|
if (is_array($token)) {
|
|
// the original token was overloaded by an injector, time
|
|
// to some fancy acrobatics
|
|
|
|
// $this->inputIndex is decremented so that the entire set gets
|
|
// re-processed
|
|
array_splice($this->inputTokens, $this->inputIndex--, 1, $token);
|
|
|
|
// adjust the injector skips based on the array substitution
|
|
if ($this->injectors) {
|
|
$offset = count($token);
|
|
for ($i = 0; $i <= $this->currentInjector; $i++) {
|
|
// because of the skip back, we need to add one more
|
|
// for uninitialized injectors. I'm not exactly
|
|
// sure why this is the case, but I think it has to
|
|
// do with the fact that we're decrementing skips
|
|
// before re-checking text
|
|
if (!$this->injectors[$i]->skip) $this->injectors[$i]->skip++;
|
|
$this->injectors[$i]->skip += $offset;
|
|
}
|
|
}
|
|
} elseif ($token) {
|
|
// regular case
|
|
$this->outputTokens[] = $token;
|
|
if ($token instanceof HTMLPurifier_Token_Start) {
|
|
$this->currentNesting[] = $token;
|
|
} elseif ($token instanceof HTMLPurifier_Token_End) {
|
|
array_pop($this->currentNesting); // not actually used
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|