diff options
Diffstat (limited to 'lib/htmlpurifier/library/HTMLPurifier/TagTransform/Font.php')
-rwxr-xr-x | lib/htmlpurifier/library/HTMLPurifier/TagTransform/Font.php | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/lib/htmlpurifier/library/HTMLPurifier/TagTransform/Font.php b/lib/htmlpurifier/library/HTMLPurifier/TagTransform/Font.php new file mode 100755 index 000000000..ed2463786 --- /dev/null +++ b/lib/htmlpurifier/library/HTMLPurifier/TagTransform/Font.php @@ -0,0 +1,96 @@ +<?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 +{ + + public $transform_to = 'span'; + + protected $_size_lookup = array( + '0' => 'xx-small', + '1' => 'xx-small', + '2' => 'small', + '3' => 'medium', + '4' => 'large', + '5' => 'x-large', + '6' => 'xx-large', + '7' => '300%', + '-1' => 'smaller', + '-2' => '60%', + '+1' => 'larger', + '+2' => '150%', + '+3' => '200%', + '+4' => '300%' + ); + + public function transform($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']{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 |