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; }