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Public Member Functions | Data Fields
HTMLPurifier_ChildDef_Table Class Reference

Definition for tables. More...

+ Inheritance diagram for HTMLPurifier_ChildDef_Table:
+ Collaboration diagram for HTMLPurifier_ChildDef_Table:

Public Member Functions

 __construct ()
 validateChildren ($tokens_of_children, $config, $context)
 Validates nodes according to definition and returns modification.
- Public Member Functions inherited from HTMLPurifier_ChildDef
 getAllowedElements ($config)
 Get lookup of tag names that should not close this element automatically.

Data Fields

 $allow_empty = false
 $type = 'table'
 $elements
- Data Fields inherited from HTMLPurifier_ChildDef
 $type
 Type of child definition, usually right-most part of class name lowercase.
 $allow_empty
 Bool that indicates whether or not an empty array of children is okay.
 $elements = array()
 Lookup array of all elements that this definition could possibly allow.

Detailed Description

Definition for tables.

The general idea is to extract out all of the essential bits, and then reconstruct it later.

This is a bit confusing, because the DTDs and the W3C validators seem to disagree on the appropriate definition. The DTD claims: 

 (CAPTION?, (COL*|COLGROUP*), THEAD?, TFOOT?, TBODY+)

But actually, the HTML4 spec then has this to say: 

 The TBODY start tag is always required except when the table
 contains only one table body and no table head or foot sections.
 The TBODY end tag may always be safely omitted.

So the DTD is kind of wrong. The validator is, unfortunately, kind of on crack.

The definition changed again in XHTML1.1; and in my opinion, this formulation makes the most sense. 

 caption?, ( col* | colgroup* ), (( thead?, tfoot?, tbody+ ) | ( tr+ ))

Essentially, we have two modes: thead/tfoot/tbody mode, and tr mode. If we encounter a thead, tfoot or tbody, we are placed in the former mode, and we must wrap any stray tr segments with a tbody. But if we don't run into any of them, just have tr tags is OK.

Definition at line 32 of file Table.php.

Constructor & Destructor Documentation

HTMLPurifier_ChildDef_Table::__construct ( )

Definition at line 38 of file Table.php.

{}

Member Function Documentation

HTMLPurifier_ChildDef_Table::validateChildren (   $tokens_of_children,
  $config,
  $context 
)

Validates nodes according to definition and returns modification.

Parameters
$tokens_of_childrenArray of HTMLPurifier_Token
$configHTMLPurifier_Config object
$contextHTMLPurifier_Context object
Returns
bool true to leave nodes as is
bool false to remove parent node
array of replacement child tokens

Reimplemented from HTMLPurifier_ChildDef.

Definition at line 39 of file Table.php.

References $ret, and $t.

{
if (empty($tokens_of_children)) return false;
// this ensures that the loop gets run one last time before closing
// up. It's a little bit of a hack, but it works! Just make sure you
// get rid of the token later.
$tokens_of_children[] = false;
// only one of these elements is allowed in a table
$caption = false;
$thead = false;
$tfoot = false;
// as many of these as you want
$cols = array();
$content = array();
$nesting = 0; // current depth so we can determine nodes
$is_collecting = false; // are we globbing together tokens to package
// into one of the collectors?
$collection = array(); // collected nodes
$tag_index = 0; // the first node might be whitespace,
// so this tells us where the start tag is
$tbody_mode = false; // if true, then we need to wrap any stray
// <tr>s with a <tbody>.
foreach ($tokens_of_children as $token) {
$is_child = ($nesting == 0);
if ($token === false) {
// terminating sequence started
} elseif ($token instanceof HTMLPurifier_Token_Start) {
$nesting++;
} elseif ($token instanceof HTMLPurifier_Token_End) {
$nesting--;
}
// handle node collection
if ($is_collecting) {
if ($is_child) {
// okay, let's stash the tokens away
// first token tells us the type of the collection
switch ($collection[$tag_index]->name) {
case 'tbody':
$tbody_mode = true;
case 'tr':
$content[] = $collection;
break;
case 'caption':
if ($caption !== false) break;
$caption = $collection;
break;
case 'thead':
case 'tfoot':
$tbody_mode = true;
// XXX This breaks rendering properties with
// Firefox, which never floats a <thead> to
// the top. Ever. (Our scheme will float the
// first <thead> to the top.) So maybe
// <thead>s that are not first should be
// turned into <tbody>? Very tricky, indeed.
// access the appropriate variable, $thead or $tfoot
$var = $collection[$tag_index]->name;
if ($$var === false) {
$$var = $collection;
} else {
// Oops, there's a second one! What
// should we do? Current behavior is to
// transmutate the first and last entries into
// tbody tags, and then put into content.
// Maybe a better idea is to *attach
// it* to the existing thead or tfoot?
// We don't do this, because Firefox
// doesn't float an extra tfoot to the
// bottom like it does for the first one.
$collection[$tag_index]->name = 'tbody';
$collection[count($collection)-1]->name = 'tbody';
$content[] = $collection;
}
break;
case 'colgroup':
$cols[] = $collection;
break;
}
$collection = array();
$is_collecting = false;
$tag_index = 0;
} else {
// add the node to the collection
$collection[] = $token;
}
}
// terminate
if ($token === false) break;
if ($is_child) {
// determine what we're dealing with
if ($token->name == 'col') {
// the only empty tag in the possie, we can handle it
// immediately
$cols[] = array_merge($collection, array($token));
$collection = array();
$tag_index = 0;
continue;
}
switch($token->name) {
case 'caption':
case 'colgroup':
case 'thead':
case 'tfoot':
case 'tbody':
case 'tr':
$is_collecting = true;
$collection[] = $token;
continue;
default:
if (!empty($token->is_whitespace)) {
$collection[] = $token;
$tag_index++;
}
continue;
}
}
}
if (empty($content)) return false;
$ret = array();
if ($caption !== false) $ret = array_merge($ret, $caption);
if ($cols !== false) foreach ($cols as $token_array) $ret = array_merge($ret, $token_array);
if ($thead !== false) $ret = array_merge($ret, $thead);
if ($tfoot !== false) $ret = array_merge($ret, $tfoot);
if ($tbody_mode) {
// a little tricky, since the start of the collection may be
// whitespace
$inside_tbody = false;
foreach ($content as $token_array) {
// find the starting token
foreach ($token_array as $t) {
if ($t->name === 'tr' || $t->name === 'tbody') {
break;
}
} // iterator variable carries over
if ($t->name === 'tr') {
if ($inside_tbody) {
$ret = array_merge($ret, $token_array);
} else {
$ret[] = new HTMLPurifier_Token_Start('tbody');
$ret = array_merge($ret, $token_array);
$inside_tbody = true;
}
} elseif ($t->name === 'tbody') {
if ($inside_tbody) {
$ret[] = new HTMLPurifier_Token_End('tbody');
$inside_tbody = false;
$ret = array_merge($ret, $token_array);
} else {
$ret = array_merge($ret, $token_array);
}
} else {
trigger_error("tr/tbody in content invariant failed in Table ChildDef", E_USER_ERROR);
}
}
if ($inside_tbody) {
$ret[] = new HTMLPurifier_Token_End('tbody');
}
} else {
foreach ($content as $token_array) {
// invariant: everything in here is <tr>s
$ret = array_merge($ret, $token_array);
}
}
if (!empty($collection) && $is_collecting == false){
// grab the trailing space
$ret = array_merge($ret, $collection);
}
array_pop($tokens_of_children); // remove phantom token
return ($ret === $tokens_of_children) ? true : $ret;
}

Field Documentation

HTMLPurifier_ChildDef_Table::$allow_empty = false

Definition at line 34 of file Table.php.

HTMLPurifier_ChildDef_Table::$elements
Initial value:
array('tr' => true, 'tbody' => true, 'thead' => true,
'tfoot' => true, 'caption' => true, 'colgroup' => true, 'col' => true)

Definition at line 36 of file Table.php.

HTMLPurifier_ChildDef_Table::$type = 'table'

Definition at line 35 of file Table.php.

The documentation for this class was generated from the following file: