class.csstidy_optimise.inc

<?php


/**
 * CSSTidy - CSS Parser and Optimiser
 *
 * CSS Optimising Class
 * This class optimises CSS data generated by csstidy.
 *
 * Copyright 2005, 2006, 2007 Florian Schmitz
 *
 * This file is part of CSSTidy.
 *
 *   CSSTidy is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published by
 *   the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   CSSTidy is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @license http://opensource.org/licenses/lgpl-license.php GNU Lesser General Public License
 * @package csstidy
 * @author Florian Schmitz (floele at gmail dot com) 2005-2007
 * @author Brett Zamir (brettz9 at yahoo dot com) 2007
 * @author Nikolay Matsievsky (speed at webo dot name) 2009-2010
 */

/**
 * CSS Optimising Class
 *
 * This class optimises CSS data generated by csstidy.
 *
 * @package csstidy
 * @author Florian Schmitz (floele at gmail dot com) 2005-2006
 * @version 1.0
 */
class csstidy_optimise {
    
    /**
     * Constructor
     * @param array $css contains the class csstidy
     * @access private
     * @version 1.0
     */
    function csstidy_optimise(&$css) {
        $this->parser =& $css;
        $this->css =& $css->css;
        $this->sub_value =& $css->sub_value;
        $this->at =& $css->at;
        $this->selector =& $css->selector;
        $this->property =& $css->property;
        $this->value =& $css->value;
    }
    
    /**
     * Optimises $css after parsing
     * @access public
     * @version 1.0
     */
    function postparse() {
        if ($this->parser
            ->get_cfg('preserve_css')) {
            return;
        }
        if ($this->parser
            ->get_cfg('merge_selectors') === 2) {
            foreach ($this->css as $medium => $value) {
                $this->merge_selectors($this->css[$medium]);
            }
        }
        if ($this->parser
            ->get_cfg('discard_invalid_selectors')) {
            foreach ($this->css as $medium => $value) {
                $this->discard_invalid_selectors($this->css[$medium]);
            }
        }
        if ($this->parser
            ->get_cfg('optimise_shorthands') > 0) {
            foreach ($this->css as $medium => $value) {
                foreach ($value as $selector => $value1) {
                    $this->css[$medium][$selector] = csstidy_optimise::merge_4value_shorthands($this->css[$medium][$selector]);
                    if ($this->parser
                        ->get_cfg('optimise_shorthands') < 2) {
                        continue;
                    }
                    $this->css[$medium][$selector] = csstidy_optimise::merge_font($this->css[$medium][$selector]);
                    if ($this->parser
                        ->get_cfg('optimise_shorthands') < 3) {
                        continue;
                    }
                    $this->css[$medium][$selector] = csstidy_optimise::merge_bg($this->css[$medium][$selector]);
                    if (empty($this->css[$medium][$selector])) {
                        unset($this->css[$medium][$selector]);
                    }
                }
            }
        }
    }
    
    /**
     * Optimises values
     * @access public
     * @version 1.0
     */
    function value() {
        $shorthands =& $GLOBALS['csstidy']['shorthands'];
        // optimise shorthand properties
        if (isset($shorthands[$this->property])) {
            $temp = csstidy_optimise::shorthand($this->value);
            // FIXME - move
            if ($temp != $this->value) {
                $this->parser
                    ->log('Optimised shorthand notation (' . $this->property . '): Changed "' . $this->value . '" to "' . $temp . '"', 'Information');
            }
            $this->value = $temp;
        }
        // Remove whitespace at ! important
        if ($this->value != $this->compress_important($this->value)) {
            $this->parser
                ->log('Optimised !important', 'Information');
        }
    }
    
    /**
     * Optimises shorthands
     * @access public
     * @version 1.0
     */
    function shorthands() {
        $shorthands =& $GLOBALS['csstidy']['shorthands'];
        if (!$this->parser
            ->get_cfg('optimise_shorthands') || $this->parser
            ->get_cfg('preserve_css')) {
            return;
        }
        if ($this->property === 'font' && $this->parser
            ->get_cfg('optimise_shorthands') > 1) {
            $this->css[$this->at][$this->selector]['font'] = '';
            $this->parser
                ->merge_css_blocks($this->at, $this->selector, csstidy_optimise::dissolve_short_font($this->value));
        }
        if ($this->property === 'background' && $this->parser
            ->get_cfg('optimise_shorthands') > 2) {
            $this->css[$this->at][$this->selector]['background'] = '';
            $this->parser
                ->merge_css_blocks($this->at, $this->selector, csstidy_optimise::dissolve_short_bg($this->value));
        }
        if (isset($shorthands[$this->property])) {
            $this->parser
                ->merge_css_blocks($this->at, $this->selector, csstidy_optimise::dissolve_4value_shorthands($this->property, $this->value));
            if (is_array($shorthands[$this->property])) {
                $this->css[$this->at][$this->selector][$this->property] = '';
            }
        }
    }
    
    /**
     * Optimises a sub-value
     * @access public
     * @version 1.0
     */
    function subvalue() {
        $replace_colors =& $GLOBALS['csstidy']['replace_colors'];
        $this->sub_value = trim($this->sub_value);
        if ($this->sub_value == '') {
            // caution : '0'
            return;
        }
        $important = '';
        if (csstidy::is_important($this->sub_value)) {
            $important = '!important';
        }
        $this->sub_value = csstidy::gvw_important($this->sub_value);
        // Compress font-weight
        if ($this->property === 'font-weight' && $this->parser
            ->get_cfg('compress_font-weight')) {
            if ($this->sub_value === 'bold') {
                $this->sub_value = '700';
                $this->parser
                    ->log('Optimised font-weight: Changed "bold" to "700"', 'Information');
            }
            else {
                if ($this->sub_value === 'normal') {
                    $this->sub_value = '400';
                    $this->parser
                        ->log('Optimised font-weight: Changed "normal" to "400"', 'Information');
                }
            }
        }
        $temp = $this->compress_numbers($this->sub_value);
        if (strcasecmp($temp, $this->sub_value) !== 0) {
            if (strlen($temp) > strlen($this->sub_value)) {
                $this->parser
                    ->log('Fixed invalid number: Changed "' . $this->sub_value . '" to "' . $temp . '"', 'Warning');
            }
            else {
                $this->parser
                    ->log('Optimised number: Changed "' . $this->sub_value . '" to "' . $temp . '"', 'Information');
            }
            $this->sub_value = $temp;
        }
        if ($this->parser
            ->get_cfg('compress_colors')) {
            $temp = $this->cut_color($this->sub_value);
            if ($temp !== $this->sub_value) {
                if (isset($replace_colors[$this->sub_value])) {
                    $this->parser
                        ->log('Fixed invalid color name: Changed "' . $this->sub_value . '" to "' . $temp . '"', 'Warning');
                }
                else {
                    $this->parser
                        ->log('Optimised color: Changed "' . $this->sub_value . '" to "' . $temp . '"', 'Information');
                }
                $this->sub_value = $temp;
            }
        }
        $this->sub_value .= $important;
    }
    
    /**
     * Compresses shorthand values. Example: margin:1px 1px 1px 1px -> margin:1px
     * @param string $value
     * @access public
     * @return string
     * @version 1.0
     */
    function shorthand($value) {
        $important = '';
        if (csstidy::is_important($value)) {
            $values = csstidy::gvw_important($value);
            $important = '!important';
        }
        else {
            $values = $value;
        }
        $values = explode(' ', $values);
        switch (count($values)) {
            case 4:
                if ($values[0] == $values[1] && $values[0] == $values[2] && $values[0] == $values[3]) {
                    return $values[0] . $important;
                }
                elseif ($values[1] == $values[3] && $values[0] == $values[2]) {
                    return $values[0] . ' ' . $values[1] . $important;
                }
                elseif ($values[1] == $values[3]) {
                    return $values[0] . ' ' . $values[1] . ' ' . $values[2] . $important;
                }
                break;
            case 3:
                if ($values[0] == $values[1] && $values[0] == $values[2]) {
                    return $values[0] . $important;
                }
                elseif ($values[0] == $values[2]) {
                    return $values[0] . ' ' . $values[1] . $important;
                }
                break;
            case 2:
                if ($values[0] == $values[1]) {
                    return $values[0] . $important;
                }
                break;
        }
        return $value;
    }
    
    /**
     * Removes unnecessary whitespace in ! important
     * @param string $string
     * @return string
     * @access public
     * @version 1.1
     */
    function compress_important(&$string) {
        if (csstidy::is_important($string)) {
            $string = csstidy::gvw_important($string) . '!important';
        }
        return $string;
    }
    
    /**
     * Color compression function. Converts all rgb() values to #-values and uses the short-form if possible. Also replaces 4 color names by #-values.
     * @param string $color
     * @return string
     * @version 1.1
     */
    function cut_color($color) {
        $replace_colors =& $GLOBALS['csstidy']['replace_colors'];
        // rgb(0,0,0) -> #000000 (or #000 in this case later)
        if (strtolower(substr($color, 0, 4)) === 'rgb(') {
            $color_tmp = substr($color, 4, strlen($color) - 5);
            $color_tmp = explode(',', $color_tmp);
            for ($i = 0; $i < count($color_tmp); $i++) {
                $color_tmp[$i] = trim($color_tmp[$i]);
                if (substr($color_tmp[$i], -1) === '%') {
                    $color_tmp[$i] = round(255 * $color_tmp[$i] / 100);
                }
                if ($color_tmp[$i] > 255) {
                    $color_tmp[$i] = 255;
                }
            }
            $color = '#';
            for ($i = 0; $i < 3; $i++) {
                if ($color_tmp[$i] < 16) {
                    $color .= '0' . dechex($color_tmp[$i]);
                }
                else {
                    $color .= dechex($color_tmp[$i]);
                }
            }
        }
        // Fix bad color names
        if (isset($replace_colors[strtolower($color)])) {
            $color = $replace_colors[strtolower($color)];
        }
        // #aabbcc -> #abc
        if (strlen($color) == 7) {
            $color_temp = strtolower($color);
            if ($color_temp[0] === '#' && $color_temp[1] == $color_temp[2] && $color_temp[3] == $color_temp[4] && $color_temp[5] == $color_temp[6]) {
                $color = '#' . $color[1] . $color[3] . $color[5];
            }
        }
        switch (strtolower($color)) {
            
            /* color name -> hex code */
            case 'black':
                return '#000';
            case 'fuchsia':
                return '#f0f';
            case 'white':
                return '#fff';
            case 'yellow':
                return '#ff0';
            
            /* hex code -> color name */
            case '#800000':
                return 'maroon';
            case '#ffa500':
                return 'orange';
            case '#808000':
                return 'olive';
            case '#800080':
                return 'purple';
            case '#008000':
                return 'green';
            case '#000080':
                return 'navy';
            case '#008080':
                return 'teal';
            case '#c0c0c0':
                return 'silver';
            case '#808080':
                return 'gray';
            case '#f00':
                return 'red';
        }
        return $color;
    }
    
    /**
     * Compresses numbers (ie. 1.0 becomes 1 or 1.100 becomes 1.1 )
     * @param string $subvalue
     * @return string
     * @version 1.2
     */
    function compress_numbers($subvalue) {
        $unit_values =& $GLOBALS['csstidy']['unit_values'];
        $color_values =& $GLOBALS['csstidy']['color_values'];
        // for font:1em/1em sans-serif...;
        if ($this->property === 'font') {
            $temp = explode('/', $subvalue);
        }
        else {
            $temp = array(
                $subvalue,
            );
        }
        for ($l = 0; $l < count($temp); $l++) {
            // if we are not dealing with a number at this point, do not optimise anything
            $number = $this->AnalyseCssNumber($temp[$l]);
            if ($number === false) {
                return $subvalue;
            }
            // Fix bad colors
            if (in_array($this->property, $color_values)) {
                $temp[$l] = '#' . $temp[$l];
                continue;
            }
            if (abs($number[0]) > 0) {
                if ($number[1] == '' && in_array($this->property, $unit_values, true)) {
                    $number[1] = 'px';
                }
            }
            else {
                $number[1] = '';
            }
            $temp[$l] = $number[0] . $number[1];
        }
        return count($temp) > 1 ? $temp[0] . '/' . $temp[1] : $temp[0];
    }
    
    /**
     * Checks if a given string is a CSS valid number. If it is,
     * an array containing the value and unit is returned
     * @param string $string
     * @return array ('unit' if unit is found or '' if no unit exists, number value) or false if no number
     */
    function AnalyseCssNumber($string) {
        // most simple checks first
        if (strlen($string) == 0 || ctype_alpha($string[0])) {
            return false;
        }
        $units =& $GLOBALS['csstidy']['units'];
        $return = array(
            0,
            '',
        );
        $return[0] = floatval($string);
        if (abs($return[0]) > 0 && abs($return[0]) < 1) {
            if ($return[0] < 0) {
                $return[0] = '-' . ltrim(substr($return[0], 1), '0');
            }
            else {
                $return[0] = ltrim($return[0], '0');
            }
        }
        // Look for unit and split from value if exists
        foreach ($units as $unit) {
            $expectUnitAt = strlen($string) - strlen($unit);
            if (!($unitInString = stristr($string, $unit))) {
                // mb_strpos() fails with "false"
                continue;
            }
            $actualPosition = strpos($string, $unitInString);
            if ($expectUnitAt === $actualPosition) {
                $return[1] = $unit;
                $string = substr($string, 0, -strlen($unit));
                break;
            }
        }
        if (!is_numeric($string)) {
            return false;
        }
        return $return;
    }
    
    /**
     * Merges selectors with same properties. Example: a{color:red} b{color:red} -> a,b{color:red}
     * Very basic and has at least one bug. Hopefully there is a replacement soon.
     * @param array $array
     * @return array
     * @access public
     * @version 1.2
     */
    function merge_selectors(&$array) {
        $css = $array;
        foreach ($css as $key => $value) {
            if (!isset($css[$key])) {
                continue;
            }
            $newsel = '';
            // Check if properties also exist in another selector
            $keys = array();
            // PHP bug (?) without $css = $array; here
            foreach ($css as $selector => $vali) {
                if ($selector == $key) {
                    continue;
                }
                if ($css[$key] === $vali) {
                    $keys[] = $selector;
                }
            }
            if (!empty($keys)) {
                $newsel = $key;
                unset($css[$key]);
                foreach ($keys as $selector) {
                    unset($css[$selector]);
                    $newsel .= ',' . $selector;
                }
                $css[$newsel] = $value;
            }
        }
        $array = $css;
    }
    
    /**
     * Removes invalid selectors and their corresponding rule-sets as
     * defined by 4.1.7 in REC-CSS2. This is a very rudimentary check
     * and should be replaced by a full-blown parsing algorithm or
     * regular expression
     * @version 1.4
     */
    function discard_invalid_selectors(&$array) {
        $invalid = array(
            '+' => true,
            '~' => true,
            ',' => true,
            '>' => true,
        );
        foreach ($array as $selector => $decls) {
            $ok = true;
            $selectors = array_map('trim', explode(',', $selector));
            foreach ($selectors as $s) {
                $simple_selectors = preg_split('/\\s*[+>~\\s]\\s*/', $s);
                foreach ($simple_selectors as $ss) {
                    if ($ss === '') {
                        $ok = false;
                    }
                    // could also check $ss for internal structure,
                    // but that probably would be too slow
                }
            }
            if (!$ok) {
                unset($array[$selector]);
            }
        }
    }
    
    /**
     * Dissolves properties like padding:10px 10px 10px to padding-top:10px;padding-bottom:10px;...
     * @param string $property
     * @param string $value
     * @return array
     * @version 1.0
     * @see merge_4value_shorthands()
     */
    function dissolve_4value_shorthands($property, $value) {
        $shorthands =& $GLOBALS['csstidy']['shorthands'];
        if (!is_array($shorthands[$property])) {
            $return[$property] = $value;
            return $return;
        }
        $important = '';
        if (csstidy::is_important($value)) {
            $value = csstidy::gvw_important($value);
            $important = '!important';
        }
        $values = explode(' ', $value);
        $return = array();
        if (count($values) == 4) {
            for ($i = 0; $i < 4; $i++) {
                $return[$shorthands[$property][$i]] = $values[$i] . $important;
            }
        }
        elseif (count($values) == 3) {
            $return[$shorthands[$property][0]] = $values[0] . $important;
            $return[$shorthands[$property][1]] = $values[1] . $important;
            $return[$shorthands[$property][3]] = $values[1] . $important;
            $return[$shorthands[$property][2]] = $values[2] . $important;
        }
        elseif (count($values) == 2) {
            for ($i = 0; $i < 4; $i++) {
                $return[$shorthands[$property][$i]] = $i % 2 != 0 ? $values[1] . $important : $values[0] . $important;
            }
        }
        else {
            for ($i = 0; $i < 4; $i++) {
                $return[$shorthands[$property][$i]] = $values[0] . $important;
            }
        }
        return $return;
    }
    
    /**
     * Explodes a string as explode() does, however, not if $sep is escaped or within a string.
     * @param string $sep seperator
     * @param string $string
     * @return array
     * @version 1.0
     */
    function explode_ws($sep, $string) {
        $status = 'st';
        $to = '';
        $output = array();
        $num = 0;
        for ($i = 0, $len = strlen($string); $i < $len; $i++) {
            switch ($status) {
                case 'st':
                    if ($string[$i] == $sep && !csstidy::escaped($string, $i)) {
                        ++$num;
                    }
                    elseif ($string[$i] === '"' || $string[$i] === '\'' || $string[$i] === '(' && !csstidy::escaped($string, $i)) {
                        $status = 'str';
                        $to = $string[$i] === '(' ? ')' : $string[$i];
                        isset($output[$num]) ? $output[$num] .= $string[$i] : ($output[$num] = $string[$i]);
                    }
                    else {
                        isset($output[$num]) ? $output[$num] .= $string[$i] : ($output[$num] = $string[$i]);
                    }
                    break;
                case 'str':
                    if ($string[$i] == $to && !csstidy::escaped($string, $i)) {
                        $status = 'st';
                    }
                    isset($output[$num]) ? $output[$num] .= $string[$i] : ($output[$num] = $string[$i]);
                    break;
            }
        }
        if (isset($output[0])) {
            return $output;
        }
        else {
            return array(
                $output,
            );
        }
    }
    
    /**
     * Merges Shorthand properties again, the opposite of dissolve_4value_shorthands()
     * @param array $array
     * @return array
     * @version 1.2
     * @see dissolve_4value_shorthands()
     */
    function merge_4value_shorthands($array) {
        $return = $array;
        $shorthands =& $GLOBALS['csstidy']['shorthands'];
        foreach ($shorthands as $key => $value) {
            if (isset($array[$value[0]]) && isset($array[$value[1]]) && isset($array[$value[2]]) && isset($array[$value[3]]) && $value !== 0) {
                $return[$key] = '';
                $important = '';
                for ($i = 0; $i < 4; $i++) {
                    $val = $array[$value[$i]];
                    if (csstidy::is_important($val)) {
                        $important = '!important';
                        $return[$key] .= csstidy::gvw_important($val) . ' ';
                    }
                    else {
                        $return[$key] .= $val . ' ';
                    }
                    unset($return[$value[$i]]);
                }
                $return[$key] = csstidy_optimise::shorthand(trim($return[$key] . $important));
            }
        }
        return $return;
    }
    
    /**
     * Dissolve background property
     * @param string $str_value
     * @return array
     * @version 1.0
     * @see merge_bg()
     * @todo full CSS 3 compliance
     */
    function dissolve_short_bg($str_value) {
        // don't try to explose background gradient !
        if (stripos($str_value, "gradient(") !== FALSE) {
            return array(
                'background' => $str_value,
            );
        }
        $background_prop_default =& $GLOBALS['csstidy']['background_prop_default'];
        $repeat = array(
            'repeat',
            'repeat-x',
            'repeat-y',
            'no-repeat',
            'space',
        );
        $attachment = array(
            'scroll',
            'fixed',
            'local',
        );
        $clip = array(
            'border',
            'padding',
        );
        $origin = array(
            'border',
            'padding',
            'content',
        );
        $pos = array(
            'top',
            'center',
            'bottom',
            'left',
            'right',
        );
        $important = '';
        $return = array(
            'background-image' => null,
            'background-size' => null,
            'background-repeat' => null,
            'background-position' => null,
            'background-attachment' => null,
            'background-clip' => null,
            'background-origin' => null,
            'background-color' => null,
        );
        if (csstidy::is_important($str_value)) {
            $important = ' !important';
            $str_value = csstidy::gvw_important($str_value);
        }
        $str_value = csstidy_optimise::explode_ws(',', $str_value);
        for ($i = 0; $i < count($str_value); $i++) {
            $have['clip'] = false;
            $have['pos'] = false;
            $have['color'] = false;
            $have['bg'] = false;
            if (is_array($str_value[$i])) {
                $str_value[$i] = $str_value[$i][0];
            }
            $str_value[$i] = csstidy_optimise::explode_ws(' ', trim($str_value[$i]));
            for ($j = 0; $j < count($str_value[$i]); $j++) {
                if ($have['bg'] === false && (substr($str_value[$i][$j], 0, 4) === 'url(' || $str_value[$i][$j] === 'none')) {
                    $return['background-image'] .= $str_value[$i][$j] . ',';
                    $have['bg'] = true;
                }
                elseif (in_array($str_value[$i][$j], $repeat, true)) {
                    $return['background-repeat'] .= $str_value[$i][$j] . ',';
                }
                elseif (in_array($str_value[$i][$j], $attachment, true)) {
                    $return['background-attachment'] .= $str_value[$i][$j] . ',';
                }
                elseif (in_array($str_value[$i][$j], $clip, true) && !$have['clip']) {
                    $return['background-clip'] .= $str_value[$i][$j] . ',';
                    $have['clip'] = true;
                }
                elseif (in_array($str_value[$i][$j], $origin, true)) {
                    $return['background-origin'] .= $str_value[$i][$j] . ',';
                }
                elseif ($str_value[$i][$j][0] === '(') {
                    $return['background-size'] .= substr($str_value[$i][$j], 1, -1) . ',';
                }
                elseif (in_array($str_value[$i][$j], $pos, true) || is_numeric($str_value[$i][$j][0]) || $str_value[$i][$j][0] === null || $str_value[$i][$j][0] === '-' || $str_value[$i][$j][0] === '.') {
                    $return['background-position'] .= $str_value[$i][$j];
                    if (!$have['pos']) {
                        $return['background-position'] .= ' ';
                    }
                    else {
                        $return['background-position'] .= ',';
                    }
                    $have['pos'] = true;
                }
                elseif (!$have['color']) {
                    $return['background-color'] .= $str_value[$i][$j] . ',';
                    $have['color'] = true;
                }
            }
        }
        foreach ($background_prop_default as $bg_prop => $default_value) {
            if ($return[$bg_prop] !== null) {
                $return[$bg_prop] = substr($return[$bg_prop], 0, -1) . $important;
            }
            else {
                $return[$bg_prop] = $default_value . $important;
            }
        }
        return $return;
    }
    
    /**
     * Merges all background properties
     * @param array $input_css
     * @return array
     * @version 1.0
     * @see dissolve_short_bg()
     * @todo full CSS 3 compliance
     */
    function merge_bg($input_css) {
        $background_prop_default =& $GLOBALS['csstidy']['background_prop_default'];
        // Max number of background images. CSS3 not yet fully implemented
        $number_of_values = @max(count(csstidy_optimise::explode_ws(',', $input_css['background-image'])), count(csstidy_optimise::explode_ws(',', $input_css['background-color'])), 1);
        // Array with background images to check if BG image exists
        $bg_img_array = @csstidy_optimise::explode_ws(',', csstidy::gvw_important($input_css['background-image']));
        $new_bg_value = '';
        $important = '';
        // if background properties is here and not empty, don't try anything
        if (isset($input_css['background']) and $input_css['background']) {
            return $input_css;
        }
        for ($i = 0; $i < $number_of_values; $i++) {
            foreach ($background_prop_default as $bg_property => $default_value) {
                // Skip if property does not exist
                if (!isset($input_css[$bg_property])) {
                    continue;
                }
                $cur_value = $input_css[$bg_property];
                // skip all optimisation if gradient() somewhere
                if (stripos($cur_value, "gradient(") !== FALSE) {
                    return $input_css;
                }
                // Skip some properties if there is no background image
                if ((!isset($bg_img_array[$i]) || $bg_img_array[$i] === 'none') && ($bg_property === 'background-size' || $bg_property === 'background-position' || $bg_property === 'background-attachment' || $bg_property === 'background-repeat')) {
                    continue;
                }
                // Remove !important
                if (csstidy::is_important($cur_value)) {
                    $important = ' !important';
                    $cur_value = csstidy::gvw_important($cur_value);
                }
                // Do not add default values
                if ($cur_value === $default_value) {
                    continue;
                }
                $temp = csstidy_optimise::explode_ws(',', $cur_value);
                if (isset($temp[$i])) {
                    if ($bg_property === 'background-size') {
                        $new_bg_value .= '(' . $temp[$i] . ') ';
                    }
                    else {
                        $new_bg_value .= $temp[$i] . ' ';
                    }
                }
            }
            $new_bg_value = trim($new_bg_value);
            if ($i != $number_of_values - 1) {
                $new_bg_value .= ',';
            }
        }
        // Delete all background-properties
        foreach ($background_prop_default as $bg_property => $default_value) {
            unset($input_css[$bg_property]);
        }
        // Add new background property
        if ($new_bg_value !== '') {
            $input_css['background'] = $new_bg_value . $important;
        }
        elseif (isset($input_css['background'])) {
            $input_css['background'] = 'none';
        }
        return $input_css;
    }
    
    /**
     * Dissolve font property
     * @param string $str_value
     * @return array
     * @version 1.3
     * @see merge_font()
     */
    function dissolve_short_font($str_value) {
        $font_prop_default =& $GLOBALS['csstidy']['font_prop_default'];
        $font_weight = array(
            'normal',
            'bold',
            'bolder',
            'lighter',
            100,
            200,
            300,
            400,
            500,
            600,
            700,
            800,
            900,
        );
        $font_variant = array(
            'normal',
            'small-caps',
        );
        $font_style = array(
            'normal',
            'italic',
            'oblique',
        );
        $important = '';
        $return = array(
            'font-style' => null,
            'font-variant' => null,
            'font-weight' => null,
            'font-size' => null,
            'line-height' => null,
            'font-family' => null,
        );
        if (csstidy::is_important($str_value)) {
            $important = '!important';
            $str_value = csstidy::gvw_important($str_value);
        }
        $have['style'] = false;
        $have['variant'] = false;
        $have['weight'] = false;
        $have['size'] = false;
        // Detects if font-family consists of several words w/o quotes
        $multiwords = false;
        // Workaround with multiple font-family
        $str_value = csstidy_optimise::explode_ws(',', trim($str_value));
        $str_value[0] = csstidy_optimise::explode_ws(' ', trim($str_value[0]));
        for ($j = 0; $j < count($str_value[0]); $j++) {
            if ($have['weight'] === false && in_array($str_value[0][$j], $font_weight)) {
                $return['font-weight'] = $str_value[0][$j];
                $have['weight'] = true;
            }
            elseif ($have['variant'] === false && in_array($str_value[0][$j], $font_variant)) {
                $return['font-variant'] = $str_value[0][$j];
                $have['variant'] = true;
            }
            elseif ($have['style'] === false && in_array($str_value[0][$j], $font_style)) {
                $return['font-style'] = $str_value[0][$j];
                $have['style'] = true;
            }
            elseif ($have['size'] === false && (is_numeric($str_value[0][$j][0]) || $str_value[0][$j][0] === null || $str_value[0][$j][0] === '.')) {
                $size = csstidy_optimise::explode_ws('/', trim($str_value[0][$j]));
                $return['font-size'] = $size[0];
                if (isset($size[1])) {
                    $return['line-height'] = $size[1];
                }
                else {
                    $return['line-height'] = '';
                    // don't add 'normal' !
                }
                $have['size'] = true;
            }
            else {
                if (isset($return['font-family'])) {
                    $return['font-family'] .= ' ' . $str_value[0][$j];
                    $multiwords = true;
                }
                else {
                    $return['font-family'] = $str_value[0][$j];
                }
            }
        }
        // add quotes if we have several qords in font-family
        if ($multiwords !== false) {
            $return['font-family'] = '"' . $return['font-family'] . '"';
        }
        $i = 1;
        while (isset($str_value[$i])) {
            $return['font-family'] .= ',' . trim($str_value[$i]);
            $i++;
        }
        // Fix for 100 and more font-size
        if ($have['size'] === false && isset($return['font-weight']) && is_numeric($return['font-weight'][0])) {
            $return['font-size'] = $return['font-weight'];
            unset($return['font-weight']);
        }
        foreach ($font_prop_default as $font_prop => $default_value) {
            if ($return[$font_prop] !== null) {
                $return[$font_prop] = $return[$font_prop] . $important;
            }
            else {
                $return[$font_prop] = $default_value . $important;
            }
        }
        return $return;
    }
    
    /**
     * Merges all fonts properties
     * @param array $input_css
     * @return array
     * @version 1.3
     * @see dissolve_short_font()
     */
    function merge_font($input_css) {
        $font_prop_default =& $GLOBALS['csstidy']['font_prop_default'];
        $new_font_value = '';
        $important = '';
        // Skip if not font-family and font-size set
        if (isset($input_css['font-family']) && isset($input_css['font-size'])) {
            // fix several words in font-family - add quotes
            if (isset($input_css['font-family'])) {
                $families = explode(",", $input_css['font-family']);
                $result_families = array();
                foreach ($families as $family) {
                    $family = trim($family);
                    $len = strlen($family);
                    if (strpos($family, " ") && !($family[0] == '"' && $family[$len - 1] == '"' || $family[0] == "'" && $family[$len - 1] == "'")) {
                        $family = '"' . $family . '"';
                    }
                    $result_families[] = $family;
                }
                $input_css['font-family'] = implode(",", $result_families);
            }
            foreach ($font_prop_default as $font_property => $default_value) {
                // Skip if property does not exist
                if (!isset($input_css[$font_property])) {
                    continue;
                }
                $cur_value = $input_css[$font_property];
                // Skip if default value is used
                if ($cur_value === $default_value) {
                    continue;
                }
                // Remove !important
                if (csstidy::is_important($cur_value)) {
                    $important = '!important';
                    $cur_value = csstidy::gvw_important($cur_value);
                }
                $new_font_value .= $cur_value;
                // Add delimiter
                $new_font_value .= $font_property === 'font-size' && isset($input_css['line-height']) ? '/' : ' ';
            }
            $new_font_value = trim($new_font_value);
            // Delete all font-properties
            foreach ($font_prop_default as $font_property => $default_value) {
                if ($font_property !== 'font' or !$new_font_value) {
                    unset($input_css[$font_property]);
                }
            }
            // Add new font property
            if ($new_font_value !== '') {
                $input_css['font'] = $new_font_value . $important;
            }
        }
        return $input_css;
    }

}