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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; } } ?>
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