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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2016 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\TextFormatter\Configurator\JavaScript; |
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use s9e\TextFormatter\Configurator\Helpers\RegexpBuilder; |
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use s9e\TextFormatter\Configurator\JavaScript\Code; |
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class StylesheetCompressor |
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{ |
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/** |
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* @var string[] List of regular expressions that match strings to deduplicate |
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*/ |
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protected $deduplicateTargets = [ |
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'<xsl:template match="', |
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'</xsl:template>', |
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'<xsl:apply-templates/>', |
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'<param name="allowfullscreen" value="true"/>', |
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'<xsl:value-of select="', |
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'<xsl:copy-of select="@', |
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'<iframe allowfullscreen="" scrolling="no"', |
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'overflow:hidden;position:relative;padding-bottom:', |
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'display:inline-block;width:100%;max-width:', |
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' [-:\\w]++="', |
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'\\{[^}]++\\}', |
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'@[-\\w]{4,}+', |
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'(?<=<)[-:\\w]{4,}+', |
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'(?<==")[^"]{4,}+"' |
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]; |
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/** |
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* @var array Associative array of string replacements as [match => replace] |
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*/ |
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protected $dictionary; |
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/** |
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* @var string Prefix used for dictionary keys |
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*/ |
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protected $keyPrefix = '$'; |
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/** |
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* @var integer Number of bytes each global substitution must save to be considered |
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*/ |
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public $minSaving = 10; |
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/** |
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* @var array Associative array of [string => saving] |
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*/ |
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protected $savings; |
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/** |
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* @var string |
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*/ |
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protected $xsl; |
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/** |
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* Encode given stylesheet into a compact JavaScript representation |
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* |
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* @param string $xsl Original stylesheet |
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* @return string JavaScript representation of the compressed stylesheet |
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*/ |
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public function encode($xsl) |
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{ |
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$this->xsl = $xsl; |
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$this->estimateSavings(); |
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$this->filterSavings(); |
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$this->buildDictionary(); |
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$js = json_encode($this->getCompressedStylesheet()); |
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if (!empty($this->dictionary)) |
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{ |
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$js .= '.replace(' . $this->getReplacementRegexp() . ',function(k){return' . json_encode($this->dictionary) . '[k]})'; |
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} |
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return $js; |
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} |
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/** |
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* Build a dictionary of all cost-effective string replacements |
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* |
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* @return void |
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*/ |
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protected function buildDictionary() |
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{ |
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$keys = $this->getAvailableKeys(); |
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rsort($keys); |
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$this->dictionary = []; |
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arsort($this->savings); |
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foreach (array_keys($this->savings) as $str) |
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{ |
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$key = array_pop($keys); |
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if (!$key) |
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{ |
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break; |
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} |
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$this->dictionary[$key] = $str; |
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} |
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} |
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/** |
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* Estimate the savings of every possible string replacement |
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* |
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* @return void |
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*/ |
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protected function estimateSavings() |
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{ |
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$this->savings = []; |
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foreach ($this->getStringsFrequency() as $str => $cnt) |
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{ |
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$len = strlen($str); |
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$originalCost = $cnt * $len; |
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$replacementCost = $cnt * 2; |
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$overhead = $len + 6; |
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$this->savings[$str] = $originalCost - ($replacementCost + $overhead); |
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} |
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} |
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/** |
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* Filter the savings according to the minSaving property |
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* |
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* @return void |
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*/ |
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protected function filterSavings() |
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{ |
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$this->savings = array_filter( |
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$this->savings, |
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function ($saving) |
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{ |
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return ($saving >= $this->minSaving); |
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} |
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); |
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} |
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/** |
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* Return all the possible dictionary keys that are not present in the original stylesheet |
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* |
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* @return string[] |
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*/ |
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protected function getAvailableKeys() |
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{ |
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return array_diff($this->getPossibleKeys(), $this->getUnavailableKeys()); |
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} |
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/** |
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* Return the stylesheet after dictionary replacements |
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* |
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* @return string |
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*/ |
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protected function getCompressedStylesheet() |
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{ |
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return strtr($this->xsl, array_flip($this->dictionary)); |
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} |
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/** |
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* Return a list of possible dictionary keys |
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* |
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* @return string[] |
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*/ |
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protected function getPossibleKeys() |
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{ |
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$keys = []; |
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foreach (range('a', 'z') as $char) |
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{ |
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$keys[] = $this->keyPrefix . $char; |
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} |
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return $keys; |
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} |
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/** |
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* Return a regexp that matches all used dictionary keys |
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* |
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* @return string |
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*/ |
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protected function getReplacementRegexp() |
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{ |
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return '/' . RegexpBuilder::fromList(array_keys($this->dictionary)) . '/g'; |
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} |
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/** |
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* Return the frequency of all deduplicatable strings |
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* |
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* @return array Array of [string => frequency] |
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*/ |
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protected function getStringsFrequency() |
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{ |
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$regexp = '(' . implode('|', $this->deduplicateTargets) . ')S'; |
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preg_match_all($regexp, $this->xsl, $matches); |
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return array_count_values($matches[0]); |
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} |
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/** |
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* Return the list of possible dictionary keys that appear in the original stylesheet |
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* |
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* @return string[] |
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*/ |
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protected function getUnavailableKeys() |
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{ |
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preg_match_all('(' . preg_quote($this->keyPrefix) . '.)', $this->xsl, $matches); |
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return array_unique($matches[0]); |
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} |
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} |
s9e /
TextFormatter
