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