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<?php
/**
* CSSTidy - CSS Parser and Optimiser
*
* CSS Optimising Class
* This class optimises CSS data generated by csstidy.
*
* This file is part of CSSTidy.
*
* CSSTidy is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with CSSTidy; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @package csstidy
* @author Florian Schmitz (floele at gmail dot com) 2005-2006
*/
/**
* 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('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][$selector] = csstidy_optimise::merge_bg($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 == 'background' && $this->parser->get_cfg('optimise_shorthands') > 1)
{
unset($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[$this->property]))
{
unset($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($temp != $this->sub_value)
{
if(strlen($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)
{
$units =& $GLOBALS['csstidy']['units'];
$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); $l++)
{
// continue if no numeric value
if (!(strlen($temp[$l]) > 0 && ( is_numeric($temp[$l]{0}) || $temp[$l]{0} == '+' || $temp[$l]{0} == '-' ) ))
{
continue;
}
// Fix bad colors
if (in_array($this->property, $color_values))
{
$temp[$l] = '#'.$temp[$l];
}
if (floatval($temp[$l]) == 0)
{
$temp[$l] = '0';
}
else
{
$unit_found = FALSE;
for ($m = 0, $size_4 = count($units); $m < $size_4; $m++)
{
if (strpos(strtolower($temp[$l]),$units[$m]) !== FALSE)
{
$temp[$l] = floatval($temp[$l]).$units[$m];
$unit_found = TRUE;
break;
}
}
if (!$unit_found && in_array($this->property,$unit_values,TRUE))
{
$temp[$l] = floatval($temp[$l]).'px';
}
else if (!$unit_found)
{
$temp[$l] = floatval($temp[$l]);
}
// Remove leading zero
if (abs(floatval($temp[$l])) < 1) {
if (floatval($temp[$l]) < 0) {
$temp[$l] = '-' . substr($temp[$l], 2);
} else {
$temp[$l] = substr($temp[$l], 1);
}
}
}
}
return ((count($temp) > 1) ? $temp[0].'/'.$temp[1] : $temp[0]);
}
/**
* 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;
}
/**
* 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)
{
$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;
$str_value[$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)
{
$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 = '';
$important = '';
for($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 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;
return $input_css;
}
}
?>