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- 06.01.2017
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StylesheetCompressor.php
001 <?php
002
003 /*
004 * @package s9e\TextFormatter
005 * @copyright Copyright (c) 2010-2016 The s9e Authors
006 * @license http://www.opensource.org/licenses/mit-license.php The MIT License
007 */
008 namespace s9e\TextFormatter\Configurator\JavaScript;
009 use s9e\TextFormatter\Configurator\Helpers\RegexpBuilder;
010 use s9e\TextFormatter\Configurator\JavaScript\Code;
011 class StylesheetCompressor
012 {
013 protected $deduplicateTargets = array(
014 '<xsl:template match="',
015 '</xsl:template>',
016 '<xsl:apply-templates/>',
017 '<param name="allowfullscreen" value="true"/>',
018 '<xsl:value-of select="',
019 '<xsl:copy-of select="@',
020 '<iframe allowfullscreen="" scrolling="no"',
021 'overflow:hidden;position:relative;padding-bottom:',
022 'display:inline-block;width:100%;max-width:',
023 ' [-:\\w]++="',
024 '\\{[^}]++\\}',
025 '@[-\\w]{4,}+',
026 '(?<=<)[-:\\w]{4,}+',
027 '(?<==")[^"]{4,}+"'
028 );
029 protected $dictionary;
030 protected $keyPrefix = '$';
031 public $minSaving = 10;
032 protected $savings;
033 protected $xsl;
034 public function encode($xsl)
035 {
036 $this->xsl = $xsl;
037 $this->estimateSavings();
038 $this->filterSavings();
039 $this->buildDictionary();
040 $js = \json_encode($this->getCompressedStylesheet());
041 if (!empty($this->dictionary))
042 $js .= '.replace(' . $this->getReplacementRegexp() . ',function(k){return' . \json_encode($this->dictionary) . '[k]})';
043 return $js;
044 }
045 protected function buildDictionary()
046 {
047 $keys = $this->getAvailableKeys();
048 \rsort($keys);
049 $this->dictionary = array();
050 \arsort($this->savings);
051 foreach (\array_keys($this->savings) as $str)
052 {
053 $key = \array_pop($keys);
054 if (!$key)
055 break;
056 $this->dictionary[$key] = $str;
057 }
058 }
059 protected function estimateSavings()
060 {
061 $this->savings = array();
062 foreach ($this->getStringsFrequency() as $str => $cnt)
063 {
064 $len = \strlen($str);
065 $originalCost = $cnt * $len;
066 $replacementCost = $cnt * 2;
067 $overhead = $len + 6;
068 $this->savings[$str] = $originalCost - ($replacementCost + $overhead);
069 }
070 }
071 protected function filterSavings()
072 {
073 $_this = $this;
074 $this->savings = \array_filter(
075 $this->savings,
076 function ($saving) use ($_this)
077 {
078 return ($saving >= $_this->minSaving);
079 }
080 );
081 }
082 protected function getAvailableKeys()
083 {
084 return \array_diff($this->getPossibleKeys(), $this->getUnavailableKeys());
085 }
086 protected function getCompressedStylesheet()
087 {
088 return \strtr($this->xsl, \array_flip($this->dictionary));
089 }
090 protected function getPossibleKeys()
091 {
092 $keys = array();
093 foreach (\range('a', 'z') as $char)
094 $keys[] = $this->keyPrefix . $char;
095 return $keys;
096 }
097 protected function getReplacementRegexp()
098 {
099 return '/' . RegexpBuilder::fromList(\array_keys($this->dictionary)) . '/g';
100 }
101 protected function getStringsFrequency()
102 {
103 $regexp = '(' . \implode('|', $this->deduplicateTargets) . ')S';
104 \preg_match_all($regexp, $this->xsl, $matches);
105 return \array_count_values($matches[0]);
106 }
107 protected function getUnavailableKeys()
108 {
109 \preg_match_all('(' . \preg_quote($this->keyPrefix) . '.)', $this->xsl, $matches);
110 return \array_unique($matches[0]);
111 }
112 }