function parse($value)
{
$font = CSS::getDefaultValue(CSS_FONT);
if ($value === 'inherit') {
$font->style = CSS_PROPERTY_INHERIT;
$font->weight = CSS_PROPERTY_INHERIT;
$font->size = CSS_PROPERTY_INHERIT;
$font->family = CSS_PROPERTY_INHERIT;
$font->line_height = CSS_PROPERTY_INHERIT;
return $font;
}
// according to CSS 2.1 standard,
// value of 'font' CSS property can be represented as follows:
// [ <'font-style'> || <'font-variant'> || <'font-weight'> ]? <'font-size'> [ / <'line-height'> ]? <'font-family'> ] |
// caption | icon | menu | message-box | small-caption | status-bar | inherit
// Note that font-family value, unlike other values, can contain spaces (in this case it should be quoted)
// Breaking value by spaces, we'll break such multi-word families.
// Replace all white space sequences with only one space;
// Remove spaces after commas; it will allow us
// to split value correctly using look-backward expressions
$value = preg_replace("/\\s+/", " ", $value);
$value = preg_replace("/,\\s+/", ",", $value);
$value = preg_replace("#\\s*/\\s*#", "/", $value);
// Split value to subvalues by all whitespaces NOT preceeded by comma;
// thus, we'll keep all alternative font-families together instead of breaking them.
// Still we have a problem with multi-word family names.
$subvalues = preg_split("/ /", $value);
// Let's scan subvalues we've received and join values containing multiword family names
$family_start = 0;
$family_running = false;
$family_double_quote = false;
for ($i = 0, $num_subvalues = count($subvalues); $i < $num_subvalues; $i++) {
$current_value = $subvalues[$i];
if ($family_running) {
$subvalues[$family_start] .= " " . $subvalues[$i];
// Remove this subvalues from the subvalue list at all
array_splice($subvalues, $i, 1);
$num_subvalues--;
$i--;
}
// Check if current subvalue contains beginning of multi-word family name
// We can detect it by searching for single or double quote without pair
if ($family_running && $family_double_quote && !preg_match('/^[^"]*("[^"]*")*[^"]*$/', $current_value)) {
$family_running = false;
} elseif ($family_running && !$family_double_quote && !preg_match("/^[^']*('[^']*')*[^']*\$/", $current_value)) {
$family_running = false;
} elseif (!$family_running && !preg_match("/^[^']*('[^']*')*[^']*\$/", $current_value)) {
$family_running = true;
$family_start = $i;
$family_double_quote = false;
} elseif (!$family_running && !preg_match('/^[^"]*("[^"]*")*[^"]*$/', $current_value)) {
$family_running = true;
$family_start = $i;
$family_double_quote = true;
}
}
// Now process subvalues one-by-one.
foreach ($subvalues as $subvalue) {
$subvalue = trim(strtolower($subvalue));
$subvalue_type = detect_font_value_type($subvalue);
switch ($subvalue_type) {
case FONT_VALUE_STYLE:
$font->style = CSSFontStyle::parse($subvalue);
break;
case FONT_VALUE_WEIGHT:
$font->weight = CSSFontWeight::parse($subvalue);
break;
case FONT_VALUE_SIZE:
$size_subvalues = explode('/', $subvalue);
$font->size = CSSFontSize::parse($size_subvalues[0]);
if (isset($size_subvalues[1])) {
$handler =& CSS::get_handler(CSS_LINE_HEIGHT);
$font->line_height = $handler->parse($size_subvalues[1]);
}
break;
case FONT_VALUE_FAMILY:
$font->family = CSSFontFamily::parse($subvalue);
break;
}
}
return $font;
}
