<?php
 class JSMin { const ORD_LF = 10; const ORD_SPACE = 32; const ACTION_KEEP_A = 1; const ACTION_DELETE_A = 2; const ACTION_DELETE_A_B = 3; protected $a = "\n"; protected $b = ''; protected $input = ''; protected $inputIndex = 0; protected $inputLength = 0; protected $lookAhead = null; protected $output = ''; public static function minify($js) { $jsmin = new JSMin($js); return $jsmin->min(); } public function __construct($input) { $this->input = str_replace("\r\n", "\n", $input); $this->inputLength = strlen($this->input); } public function min() { if ($this->output !== '') { return $this->output; } $this->action(self::ACTION_DELETE_A_B); while ($this->a !== null) { $command = self::ACTION_KEEP_A; if ($this->a === ' ') { if (! $this->isAlphaNum($this->b)) { $command = self::ACTION_DELETE_A; } } elseif ($this->a === "\n") { if ($this->b === ' ') { $command = self::ACTION_DELETE_A_B; } elseif (false === strpos('{[(+-', $this->b) && ! $this->isAlphaNum($this->b)) { $command = self::ACTION_DELETE_A; } } elseif (! $this->isAlphaNum($this->a)) { if ($this->b === ' ' || ($this->b === "\n" && (false === strpos('}])+-"\'', $this->a)))) { $command = self::ACTION_DELETE_A_B; } } $this->action($command); } $this->output = trim($this->output); return $this->output; } protected function action($command) { switch ($command) { case self::ACTION_KEEP_A: $this->output .= $this->a; case self::ACTION_DELETE_A: $this->a = $this->b; if ($this->a === "'" || $this->a === '"') { $str = $this->a; while (true) { $this->output .= $this->a; $this->a = $this->get(); if ($this->a === $this->b) { break; } if (ord($this->a) <= self::ORD_LF) { throw new JSMin_UnterminatedStringException( 'Unterminated String: ' . var_export($str, true)); } $str .= $this->a; if ($this->a === '\\') { $this->output .= $this->a; $this->a = $this->get(); $str .= $this->a; } } } case self::ACTION_DELETE_A_B: $this->b = $this->next(); if ($this->b === '/' && $this->isRegexpLiteral()) { $this->output .= $this->a . $this->b; $pattern = '/'; while (true) { $this->a = $this->get(); $pattern .= $this->a; if ($this->a === '/') { break; } elseif ($this->a === '\\') { $this->output .= $this->a; $this->a = $this->get(); $pattern .= $this->a; } elseif (ord($this->a) <= self::ORD_LF) { throw new JSMin_UnterminatedRegExpException( 'Unterminated RegExp: '. var_export($pattern, true)); } $this->output .= $this->a; } $this->b = $this->next(); } } } protected function isRegexpLiteral() { if (false !== strpos("\n{;(,=:[!&|?", $this->a)) { return true; } if (' ' === $this->a) { $length = strlen($this->output); if ($length < 2) { return true; } if (preg_match('/(?:case|else|in|return|typeof)$/', $this->output, $m)) { if ($this->output === $m[0]) { return true; } $charBeforeKeyword = substr($this->output, $length - strlen($m[0]) - 1, 1); if (! $this->isAlphaNum($charBeforeKeyword)) { return true; } } } return false; } protected function get() { $c = $this->lookAhead; $this->lookAhead = null; if ($c === null) { if ($this->inputIndex < $this->inputLength) { $c = $this->input[$this->inputIndex]; $this->inputIndex += 1; } else { return null; } } if ($c === "\r" || $c === "\n") { return "\n"; } if (ord($c) < self::ORD_SPACE) { return ' '; } return $c; } protected function peek() { $this->lookAhead = $this->get(); return $this->lookAhead; } protected function isAlphaNum($c) { return (preg_match('/^[0-9a-zA-Z_\\$\\\\]$/', $c) || ord($c) > 126); } protected function singleLineComment() { $comment = ''; while (true) { $get = $this->get(); $comment .= $get; if (ord($get) <= self::ORD_LF) { if (preg_match('/^\\/@(?:cc_on|if|elif|else|end)\\b/', $comment)) { return "/{$comment}"; } return $get; } } } protected function multipleLineComment() { $this->get(); $comment = ''; while (true) { $get = $this->get(); if ($get === '*') { if ($this->peek() === '/') { $this->get(); if (0 === strpos($comment, '!')) { return "\n/*" . substr($comment, 1) . "*/\n"; } if (preg_match('/^@(?:cc_on|if|elif|else|end)\\b/', $comment)) { return "/*{$comment}*/"; } return ' '; } } elseif ($get === null) { throw new JSMin_UnterminatedCommentException('Unterminated Comment: ' . var_export('/*' . $comment, true)); } $comment .= $get; } } protected function next() { $get = $this->get(); if ($get !== '/') { return $get; } switch ($this->peek()) { case '/': return $this->singleLineComment(); case '*': return $this->multipleLineComment(); default: return $get; } } } class JSMin_UnterminatedStringException extends Exception {} class JSMin_UnterminatedCommentException extends Exception {} class JSMin_UnterminatedRegExpException extends Exception {} 