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diff --git a/library/HTMLPurifier/Strategy/MakeWellFormed.php b/library/HTMLPurifier/Strategy/MakeWellFormed.php
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-<?php
-
-/**
- * Takes tokens makes them well-formed (balance end tags, etc.)
- *
- * Specification of the armor attributes this strategy uses:
- *
- * - MakeWellFormed_TagClosedError: This armor field is used to
- * suppress tag closed errors for certain tokens [TagClosedSuppress],
- * in particular, if a tag was generated automatically by HTML
- * Purifier, we may rely on our infrastructure to close it for us
- * and shouldn't report an error to the user [TagClosedAuto].
- */
-class HTMLPurifier_Strategy_MakeWellFormed extends HTMLPurifier_Strategy
-{
-
- /**
- * Array stream of tokens being processed.
- * @type HTMLPurifier_Token[]
- */
- protected $tokens;
-
- /**
- * Current token.
- * @type HTMLPurifier_Token
- */
- protected $token;
-
- /**
- * Zipper managing the true state.
- * @type HTMLPurifier_Zipper
- */
- protected $zipper;
-
- /**
- * Current nesting of elements.
- * @type array
- */
- protected $stack;
-
- /**
- * Injectors active in this stream processing.
- * @type HTMLPurifier_Injector[]
- */
- protected $injectors;
-
- /**
- * Current instance of HTMLPurifier_Config.
- * @type HTMLPurifier_Config
- */
- protected $config;
-
- /**
- * Current instance of HTMLPurifier_Context.
- * @type HTMLPurifier_Context
- */
- protected $context;
-
- /**
- * @param HTMLPurifier_Token[] $tokens
- * @param HTMLPurifier_Config $config
- * @param HTMLPurifier_Context $context
- * @return HTMLPurifier_Token[]
- * @throws HTMLPurifier_Exception
- */
- public function execute($tokens, $config, $context)
- {
- $definition = $config->getHTMLDefinition();
-
- // local variables
- $generator = new HTMLPurifier_Generator($config, $context);
- $escape_invalid_tags = $config->get('Core.EscapeInvalidTags');
- // used for autoclose early abortion
- $global_parent_allowed_elements = $definition->info_parent_def->child->getAllowedElements($config);
- $e = $context->get('ErrorCollector', true);
- $i = false; // injector index
- list($zipper, $token) = HTMLPurifier_Zipper::fromArray($tokens);
- if ($token === NULL) {
- return array();
- }
- $reprocess = false; // whether or not to reprocess the same token
- $stack = array();
-
- // member variables
- $this->stack =& $stack;
- $this->tokens =& $tokens;
- $this->token =& $token;
- $this->zipper =& $zipper;
- $this->config = $config;
- $this->context = $context;
-
- // context variables
- $context->register('CurrentNesting', $stack);
- $context->register('InputZipper', $zipper);
- $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 $injector) {
- if (!$injector) {
- continue;
- }
- 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 $error is not allowed", E_USER_WARNING);
- }
-
- // -- end INJECTOR --
-
- // a note on reprocessing:
- // In order to reduce code duplication, whenever some code needs
- // to make HTML changes in order to make things "correct", the
- // new HTML gets sent through the purifier, regardless of its
- // status. This means that if we add a start token, because it
- // was totally necessary, we don't have to update nesting; we just
- // punt ($reprocess = true; continue;) and it does that for us.
-
- // isset is in loop because $tokens size changes during loop exec
- for (;;
- // only increment if we don't need to reprocess
- $reprocess ? $reprocess = false : $token = $zipper->next($token)) {
-
- // check for a rewind
- if (is_int($i)) {
- // 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_offset = $this->injectors[$i]->getRewindOffset();
- if (is_int($rewind_offset)) {
- for ($j = 0; $j < $rewind_offset; $j++) {
- if (empty($zipper->front)) break;
- $token = $zipper->prev($token);
- // indicate that other injectors should not process this token,
- // but we need to reprocess it
- unset($token->skip[$i]);
- $token->rewind = $i;
- if ($token instanceof HTMLPurifier_Token_Start) {
- array_pop($this->stack);
- } elseif ($token instanceof HTMLPurifier_Token_End) {
- $this->stack[] = $token->start;
- }
- }
- }
- $i = false;
- }
-
- // handle case of document end
- if ($token === NULL) {
- // kill processing if stack is empty
- if (empty($this->stack)) {
- break;
- }
-
- // peek
- $top_nesting = array_pop($this->stack);
- $this->stack[] = $top_nesting;
-
- // send error [TagClosedSuppress]
- if ($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
- $token = new HTMLPurifier_Token_End($top_nesting->name);
-
- // punt!
- $reprocess = true;
- continue;
- }
-
- //echo '<br>'; printZipper($zipper, $token);//printTokens($this->stack);
- //flush();
-
- // 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;
- }
- // XXX fuckup
- $r = $token;
- $injector->handleText($r);
- $token = $this->processToken($r, $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,
- $token->line,
- $token->col,
- $token->armor
- );
- $ok = true;
- } elseif ($type && $type !== 'empty' && $token instanceof HTMLPurifier_Token_Empty) {
- // claims to be empty but really is a start tag
- // NB: this assignment is required
- $old_token = $token;
- $token = new HTMLPurifier_Token_End($token->name);
- $token = $this->insertBefore(
- new HTMLPurifier_Token_Start($old_token->name, $old_token->attr, $old_token->line, $old_token->col, $old_token->armor)
- );
- // 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)) {
-
- // Performance note: you might think that it's rather
- // inefficient, recalculating the autoclose information
- // for every tag that a token closes (since when we
- // do an autoclose, we push a new token into the
- // stream and then /process/ that, before
- // re-processing this token.) But this is
- // necessary, because an injector can make an
- // arbitrary transformations to the autoclosing
- // tokens we introduce, so things may have changed
- // in the meantime. Also, doing the inefficient thing is
- // "easy" to reason about (for certain perverse definitions
- // of "easy")
-
- $parent = array_pop($this->stack);
- $this->stack[] = $parent;
-
- $parent_def = null;
- $parent_elements = null;
- $autoclose = false;
- if (isset($definition->info[$parent->name])) {
- $parent_def = $definition->info[$parent->name];
- $parent_elements = $parent_def->child->getAllowedElements($config);
- $autoclose = !isset($parent_elements[$token->name]);
- }
-
- if ($autoclose && $definition->info[$token->name]->wrap) {
- // Check if an element can be wrapped by another
- // element to make it valid in a context (for
- // example, <ul><ul> needs a <li> in between)
- $wrapname = $definition->info[$token->name]->wrap;
- $wrapdef = $definition->info[$wrapname];
- $elements = $wrapdef->child->getAllowedElements($config);
- if (isset($elements[$token->name]) && isset($parent_elements[$wrapname])) {
- $newtoken = new HTMLPurifier_Token_Start($wrapname);
- $token = $this->insertBefore($newtoken);
- $reprocess = true;
- continue;
- }
- }
-
- $carryover = false;
- if ($autoclose && $parent_def->formatting) {
- $carryover = true;
- }
-
- if ($autoclose) {
- // check if this autoclose is doomed to fail
- // (this rechecks $parent, which his harmless)
- $autoclose_ok = isset($global_parent_allowed_elements[$token->name]);
- if (!$autoclose_ok) {
- foreach ($this->stack as $ancestor) {
- $elements = $definition->info[$ancestor->name]->child->getAllowedElements($config);
- if (isset($elements[$token->name])) {
- $autoclose_ok = true;
- break;
- }
- if ($definition->info[$token->name]->wrap) {
- $wrapname = $definition->info[$token->name]->wrap;
- $wrapdef = $definition->info[$wrapname];
- $wrap_elements = $wrapdef->child->getAllowedElements($config);
- if (isset($wrap_elements[$token->name]) && isset($elements[$wrapname])) {
- $autoclose_ok = true;
- break;
- }
- }
- }
- }
- if ($autoclose_ok) {
- // errors need to be updated
- $new_token = new HTMLPurifier_Token_End($parent->name);
- $new_token->start = $parent;
- // [TagClosedSuppress]
- if ($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', $parent);
- }
- }
- if ($carryover) {
- $element = clone $parent;
- // [TagClosedAuto]
- $element->armor['MakeWellFormed_TagClosedError'] = true;
- $element->carryover = true;
- $token = $this->processToken(array($new_token, $token, $element));
- } else {
- $token = $this->insertBefore($new_token);
- }
- } else {
- $token = $this->remove();
- }
- $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;
- }
- $r = $token;
- $injector->handleElement($r);
- $token = $this->processToken($r, $i);
- $reprocess = true;
- break;
- }
- if (!$reprocess) {
- // ah, nothing interesting happened; do normal processing
- 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');
- }
- $token = new HTMLPurifier_Token_Text($generator->generateFromToken($token));
- } else {
- if ($e) {
- $e->send(E_WARNING, 'Strategy_MakeWellFormed: Unnecessary end tag removed');
- }
- $token = $this->remove();
- }
- $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;
- }
- $r = $token;
- $injector->handleEnd($r);
- $token = $this->processToken($r, $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 ($escape_invalid_tags) {
- if ($e) {
- $e->send(E_WARNING, 'Strategy_MakeWellFormed: Stray end tag to text');
- }
- $token = new HTMLPurifier_Token_Text($generator->generateFromToken($token));
- } else {
- if ($e) {
- $e->send(E_WARNING, 'Strategy_MakeWellFormed: Stray end tag removed');
- }
- $token = $this->remove();
- }
- $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 $j == 0, i.e. the current ending tag, from
- // the errors... [TagClosedSuppress]
- if (!isset($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) {
- // [TagClosedAuto]
- $element = clone $skipped_tags[$j];
- $element->carryover = true;
- $element->armor['MakeWellFormed_TagClosedError'] = true;
- $replace[] = $element;
- }
- }
- $token = $this->processToken($replace);
- $reprocess = true;
- continue;
- }
-
- $context->destroy('CurrentToken');
- $context->destroy('CurrentNesting');
- $context->destroy('InputZipper');
-
- unset($this->injectors, $this->stack, $this->tokens);
- return $zipper->toArray($token);
- }
-
- /**
- * Processes arbitrary token values for complicated substitution patterns.
- * In general:
- *
- * If $token is an array, it is a list of tokens to substitute for the
- * current token. These tokens then get individually processed. If there
- * is a leading integer in the list, that integer determines how many
- * tokens from the stream should be removed.
- *
- * If $token is a regular token, it is swapped with the current token.
- *
- * If $token is false, the current token is deleted.
- *
- * If $token is an integer, that number of tokens (with the first token
- * being the current one) will be deleted.
- *
- * @param HTMLPurifier_Token|array|int|bool $token Token substitution value
- * @param HTMLPurifier_Injector|int $injector Injector that performed the substitution; default is if
- * this is not an injector related operation.
- * @throws HTMLPurifier_Exception
- */
- protected function processToken($token, $injector = -1)
- {
- // normalize forms of token
- if (is_object($token)) {
- $token = array(1, $token);
- }
- if (is_int($token)) {
- $token = array($token);
- }
- if ($token === false) {
- $token = array(1);
- }
- if (!is_array($token)) {
- throw new HTMLPurifier_Exception('Invalid token type from injector');
- }
- if (!is_int($token[0])) {
- array_unshift($token, 1);
- }
- if ($token[0] === 0) {
- throw new HTMLPurifier_Exception('Deleting zero tokens is not valid');
- }
-
- // $token is now an array with the following form:
- // array(number nodes to delete, new node 1, new node 2, ...)
-
- $delete = array_shift($token);
- list($old, $r) = $this->zipper->splice($this->token, $delete, $token);
-
- if ($injector > -1) {
- // determine appropriate skips
- $oldskip = isset($old[0]) ? $old[0]->skip : array();
- foreach ($token as $object) {
- $object->skip = $oldskip;
- $object->skip[$injector] = true;
- }
- }
-
- return $r;
-
- }
-
- /**
- * Inserts a token before the current token. Cursor now points to
- * this token. You must reprocess after this.
- * @param HTMLPurifier_Token $token
- */
- private function insertBefore($token)
- {
- // NB not $this->zipper->insertBefore(), due to positioning
- // differences
- $splice = $this->zipper->splice($this->token, 0, array($token));
-
- return $splice[1];
- }
-
- /**
- * Removes current token. Cursor now points to new token occupying previously
- * occupied space. You must reprocess after this.
- */
- private function remove()
- {
- return $this->zipper->delete();
- }
-}
-
-// vim: et sw=4 sts=4