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<?php |
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/** |
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* @package s9e\SourceOptimizer |
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* @copyright Copyright (c) 2014-2017 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\SourceOptimizer\Passes; |
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use s9e\SourceOptimizer\ContextHelper; |
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use s9e\SourceOptimizer\Pass; |
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use s9e\SourceOptimizer\TokenStream; |
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class MinifyVars extends Pass |
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{ |
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/** |
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* @var integer Number of variables processed in current function block |
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*/ |
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protected $cnt; |
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/** |
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* @var string Regexp that matches variable names that need to be preserved |
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*/ |
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public $preserveRegexp = '(^\\$(?:\\$|__|(?:this|GLOBALS|_[A-Z]+|php_errormsg|HTTP_RAW_POST_DATA|http_response_header|arg[cv]))$)S'; |
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/** |
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* @var TokenStream Token stream of the source being processed |
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*/ |
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protected $stream; |
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/** |
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* @var array Map of [original name => minified name] |
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*/ |
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protected $varNames; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function optimize(TokenStream $stream) |
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{ |
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$this->stream = $stream; |
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ContextHelper::forEachFunction( |
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$this->stream, |
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function ($startOffset, $endOffset) |
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{ |
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$this->optimizeBlock($startOffset, $endOffset); |
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} |
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); |
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} |
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/** |
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* Test whether current token is a variable that can be minified |
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* |
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* @return bool |
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*/ |
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protected function canBeMinified() |
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{ |
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if (!$this->stream->is(T_VARIABLE)) |
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{ |
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return false; |
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} |
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return !preg_match($this->preserveRegexp, $this->stream->currentText()); |
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} |
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/** |
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* Generate a minified name for given variable |
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* |
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* @param string $varName Original variable |
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* @return string Minified variable |
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*/ |
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protected function getName($varName) |
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{ |
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if (!isset($this->varNames[$varName])) |
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{ |
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$this->varNames[$varName] = $this->generateName(); |
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} |
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return $this->varNames[$varName]; |
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} |
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/** |
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* Generate a minified variable name |
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* |
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* @return string |
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*/ |
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protected function generateName() |
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{ |
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$n = $this->cnt; |
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$chars = '_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; |
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// Increment the counter and skip over the digits range if the name would start with one |
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$this->cnt += ($this->cnt % 63 < 52) ? 1 : 11; |
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$varName = '$'; |
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do |
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{ |
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$varName .= $chars[$n % 63]; |
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$n = floor($n / 63); |
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} |
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while ($n > 0); |
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return $varName; |
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} |
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/** |
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* Handle the current double colon token |
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* |
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* @return void |
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*/ |
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protected function handleDoubleColon() |
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{ |
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// Save the offset of the double colon then go to the next significant token, e.g. foo::$bar |
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$offset = $this->stream->key(); |
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$this->stream->next(); |
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$this->stream->skipNoise(); |
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if (!$this->stream->is(T_VARIABLE)) |
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{ |
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return; |
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} |
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// Test whether the variable is followed by a parenthesis. If so, that makes it a dynamic |
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// method call and we should minify the variable |
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$this->stream->next(); |
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$this->stream->skipNoise(); |
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if ($this->stream->current() === '(') |
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{ |
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// Rewind to the double colon |
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$this->stream->seek($offset); |
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} |
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} |
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/** |
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* Minify variables in given function block |
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* |
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* @param integer $startOffset |
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* @param integer $endOffset |
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* @return void |
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*/ |
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protected function optimizeBlock($startOffset, $endOffset) |
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{ |
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$this->resetNames(); |
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$this->stream->seek($startOffset); |
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while ($this->stream->valid() && $this->stream->key() <= $endOffset) |
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{ |
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if ($this->stream->is(T_DOUBLE_COLON)) |
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{ |
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$this->handleDoubleColon(); |
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} |
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elseif ($this->canBeMinified()) |
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{ |
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$varName = $this->stream->currentText(); |
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$this->stream->replace([T_VARIABLE, $this->getName($varName)]); |
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} |
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$this->stream->next(); |
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} |
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} |
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/** |
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* Reset the map of variable names |
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* |
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* @return void |
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*/ |
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protected function resetNames() |
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{ |
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$this->cnt = 0; |
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$this->varNames = []; |
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} |
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} |
s9e /
SourceOptimizer
