$transform_to
$transform_to
Tag name to transform the tag to.
Transforms FONT tags to the proper form (SPAN with CSS styling)
This transformation takes the three proprietary attributes of FONT and transforms them into their corresponding CSS attributes. These are color, face, and size.
transform(\HTMLPurifier_Token_Tag $tag, \HTMLPurifier_Config $config, \HTMLPurifier_Context $context) : \HTMLPurifier_Token_End|string
Transforms the obsolete tag into the valid tag.
| \HTMLPurifier_Token_Tag | $tag | |
| \HTMLPurifier_Config | $config | |
| \HTMLPurifier_Context | $context |
<?php
/**
* Transforms FONT tags to the proper form (SPAN with CSS styling)
*
* This transformation takes the three proprietary attributes of FONT and
* transforms them into their corresponding CSS attributes. These are color,
* face, and size.
*
* @note Size is an interesting case because it doesn't map cleanly to CSS.
* Thanks to
* http://style.cleverchimp.com/font_size_intervals/altintervals.html
* for reasonable mappings.
* @warning This doesn't work completely correctly; specifically, this
* TagTransform operates before well-formedness is enforced, so
* the "active formatting elements" algorithm doesn't get applied.
*/
class HTMLPurifier_TagTransform_Font extends HTMLPurifier_TagTransform
{
/**
* @type string
*/
public $transform_to = 'span';
/**
* @type array
*/
protected $_size_lookup = array(
'0' => 'xx-small',
'1' => 'xx-small',
'2' => 'small',
'3' => 'medium',
'4' => 'large',
'5' => 'x-large',
'6' => 'xx-large',
'7' => '300%',
'-1' => 'smaller',
'-2' => '60%',
'+1' => 'larger',
'+2' => '150%',
'+3' => '200%',
'+4' => '300%'
);
/**
* @param HTMLPurifier_Token_Tag $tag
* @param HTMLPurifier_Config $config
* @param HTMLPurifier_Context $context
* @return HTMLPurifier_Token_End|string
*/
public function transform($tag, $config, $context)
{
if ($tag instanceof HTMLPurifier_Token_End) {
$new_tag = clone $tag;
$new_tag->name = $this->transform_to;
return $new_tag;
}
$attr = $tag->attr;
$prepend_style = '';
// handle color transform
if (isset($attr['color'])) {
$prepend_style .= 'color:' . $attr['color'] . ';';
unset($attr['color']);
}
// handle face transform
if (isset($attr['face'])) {
$prepend_style .= 'font-family:' . $attr['face'] . ';';
unset($attr['face']);
}
// handle size transform
if (isset($attr['size'])) {
// normalize large numbers
if ($attr['size'] !== '') {
if ($attr['size'][0] == '+' || $attr['size'][0] == '-') {
$size = (int)$attr['size'];
if ($size < -2) {
$attr['size'] = '-2';
}
if ($size > 4) {
$attr['size'] = '+4';
}
} else {
$size = (int)$attr['size'];
if ($size > 7) {
$attr['size'] = '7';
}
}
}
if (isset($this->_size_lookup[$attr['size']])) {
$prepend_style .= 'font-size:' .
$this->_size_lookup[$attr['size']] . ';';
}
unset($attr['size']);
}
if ($prepend_style) {
$attr['style'] = isset($attr['style']) ?
$prepend_style . $attr['style'] :
$prepend_style;
}
$new_tag = clone $tag;
$new_tag->name = $this->transform_to;
$new_tag->attr = $attr;
return $new_tag;
}
}
// vim: et sw=4 sts=4