mirror of
https://github.com/mrclay/minify.git
synced 2025-08-08 23:26:43 +02:00
JSMin.php : Overhaul for readability, more useful exceptions
This commit is contained in:
Steve Clay
@@ -11,11 +11,6 @@
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* comments that begin with "/*!" (for documentation purposes). In the latter case
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* newlines are inserted around the comment to enhance readability.
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*
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* Known issue: regular expressions containing quote characters must be proceeded
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* by one of the following characters: (,=:[!&|?
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* E.g. JSMin will fail on the following: return /'/;
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* The simple workaround is to wrap the expression in parenthesis: return (/'/);
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*
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* PHP 5 or higher is required.
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*
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* Permission is hereby granted to use this version of the library under the
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@@ -58,15 +53,15 @@
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class JSMin {
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const ORD_LF = 10;
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const ORD_SPACE = 32;
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protected $a = '';
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protected $a = "\n";
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protected $b = '';
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protected $input = '';
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protected $inputIndex = 0;
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protected $inputLength = 0;
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protected $lookAhead = null;
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protected $output = '';
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/**
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* Minify Javascript
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*
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@@ -78,13 +73,62 @@ class JSMin {
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$jsmin = new JSMin($js);
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return $jsmin->min();
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}
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protected function __construct($input)
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/**
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* Setup process
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*/
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public function __construct($input)
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{
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$this->input = str_replace("\r\n", "\n", $input);
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$this->inputLength = strlen($this->input);
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}
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/**
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* Perform minification, return result
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*/
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public function min()
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{
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if ($this->output !== '') {
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// min already run
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return $this->output;
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}
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$this->action(3);
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while ($this->a !== null) {
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// determine next action
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if ($this->a === ' ') {
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$act = $this->isAlphaNum($this->b) ? 1 : 2;
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} elseif ($this->a === "\n") {
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if ($this->b === ' ') {
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$act = 3;
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} elseif (false !== strpos('{[(+-', $this->b)) {
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$act = 1;
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} else {
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$act = $this->isAlphaNum($this->b) ? 1 : 2;
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}
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} else {
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if ($this->b === ' ') {
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$act = $this->isAlphaNum($this->a) ? 1 : 3;
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} elseif ($this->b === "\n") {
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if (false !== strpos('}])+-"\'', $this->a)) {
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$act = 1;
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} else {
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$act = $this->isAlphaNum($this->a) ? 1 : 3;
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}
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} else {
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$act = 1;
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}
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}
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$this->action($act);
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}
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return $this->output;
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}
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/**
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* 1 = Output A. Copy B to A. Get the next B.
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* 2 = Copy B to A. Get the next B. (Delete A).
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* 3 = Get the next B. (Delete B).
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*/
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protected function action($d)
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{
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switch ($d) {
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@@ -94,65 +138,82 @@ class JSMin {
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case 2:
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$this->a = $this->b;
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if ($this->a === "'" || $this->a === '"') {
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for (;;) {
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// string literal
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$str = ''; // in case needed for exception
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while (true) {
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$this->output .= $this->a;
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$this->a = $this->get();
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if ($this->a === $this->b) {
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// end quote
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break;
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}
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if (ord($this->a) <= self::ORD_LF) {
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throw new JSMinException('Unterminated string literal.');
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throw new JSMin_UnterminatedStringException('Contents: ' . $str);
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}
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$str .= $this->a;
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if ($this->a === '\\') {
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$this->output .= $this->a;
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$this->a = $this->get();
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$str .= $this->a;
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}
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}
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}
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// fallthrough
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case 3:
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$this->b = $this->next();
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if ($this->b === '/') {
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switch ($this->a) {
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case "\n":
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case ' ':
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if (! $this->spaceBeforeRegExp($this->output)) {
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break;
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}
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case '{':
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case ';':
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case '(':
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case ',':
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case '=':
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case ':':
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case '[':
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case '!':
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case '&':
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case '|':
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case '?':
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$this->output .= $this->a.$this->b;
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for (;;) {
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$this->a = $this->get();
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if ($this->a === '/') {
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break; // for (;;)
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} elseif ($this->a === '\\') {
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$this->output .= $this->a;
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$this->a = $this->get();
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} elseif (ord($this->a) <= self::ORD_LF) {
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throw new JSMinException('Unterminated regular expression literal.');
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}
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$this->output .= $this->a;
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}
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$this->b = $this->next();
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break; // switch ($this->a)
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// end case ?
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if ($this->b === '/' && $this->isRegexpLiteral()) {
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// RegExp literal
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$this->output .= $this->a . $this->b;
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$pattern = '/'; // in case needed for exception
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while (true) {
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$this->a = $this->get();
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$pattern .= $this->a;
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if ($this->a === '/') {
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// end pattern
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break; // while (true)
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} elseif ($this->a === '\\') {
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$this->output .= $this->a;
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$this->a = $this->get();
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$pattern .= $this->a;
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} elseif (ord($this->a) <= self::ORD_LF) {
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throw new JSMin_UnterminatedRegExpException('Contents: '. $pattern);
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}
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$this->output .= $this->a;
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}
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$this->b = $this->next();
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}
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break; // switch ($d)
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// end case 3
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}
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}
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protected function isRegexpLiteral()
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{
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if (false !== strpos("\n{;(,=:[!&|?", $this->a)) {
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return true;
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}
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if (' ' === $this->a) {
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// see if preceeded by keyword
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$length = strlen($this->output);
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if ($length < 2) {
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return true;
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}
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if (preg_match('/(?:case|else|in|return|typeof)$/', $this->output, $m)) {
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if ($this->output === $m[0]) {
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return true;
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}
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$charBeforeKeyword = substr($this->output, $length - strlen($m[0]) - 1, 1);
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if (! $this->isAlphaNum($charBeforeKeyword)) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Get next char. Convert ctrl char to space.
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*/
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protected function get()
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{
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$c = $this->lookAhead;
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@@ -162,170 +223,98 @@ class JSMin {
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$c = $this->input[$this->inputIndex];
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$this->inputIndex += 1;
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} else {
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$c = null;
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return null;
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}
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}
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return ($c === "\r")
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? "\n"
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: ($c === null || $c === "\n" || ord($c) >= self::ORD_SPACE
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? $c
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: ' ');
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}
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protected function isAlphaNum($c)
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{
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return (ord($c) > 126
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|| $c === '\\'
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|| preg_match('/^[\w\$]$/', $c) === 1);
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}
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protected function min()
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{
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$this->a = "\n";
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$this->action(3);
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while ($this->a !== null) {
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switch ($this->a) {
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case ' ':
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if ($this->isAlphaNum($this->b)) {
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$this->action(1);
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} else {
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$this->action(2);
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}
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break;
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case "\n":
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switch ($this->b) {
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case '{':
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case '[':
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case '(':
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case '+':
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case '-':
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$this->action(1);
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break;
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case ' ':
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$this->action(3);
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break;
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default:
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if ($this->isAlphaNum($this->b)) {
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$this->action(1);
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} else {
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$this->action(2);
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}
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}
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break;
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default:
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switch ($this->b) {
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case ' ':
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if ($this->isAlphaNum($this->a)) {
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$this->action(1);
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break; // switch ($this->b)
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}
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$this->action(3);
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break; // switch ($this->b)
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case "\n":
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switch ($this->a) {
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case '}':
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case ']':
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case ')':
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case '+':
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case '-':
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case '"':
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case "'":
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$this->action(1);
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break; // switch ($this->a)
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default:
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if ($this->isAlphaNum($this->a)) {
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$this->action(1);
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} else {
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$this->action(3);
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}
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}
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break; // switch ($this->b)
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default:
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$this->action(1);
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break; // switch ($this->b)
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}
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// end default
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}
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if ($c === "\r" || $c === "\n") {
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return "\n";
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}
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return $this->output;
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}
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protected function next()
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{
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$get = $this->get();
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if ($get === '/') {
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$commentContents = '';
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switch ($this->peek()) {
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case '/':
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// "//" comment
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for (;;) {
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$get = $this->get();
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$commentContents .= $get;
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if (ord($get) <= self::ORD_LF) {
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return preg_match('/^\\/@(?:cc_on|if|elif|else|end)\\b/', $commentContents)
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? "/{$commentContents}"
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: $get;
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}
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}
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case '*':
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// "/* */" comment
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$this->get();
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for (;;) {
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$get = $this->get();
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switch ($get) {
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case '*':
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if ($this->peek() === '/') {
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$this->get();
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if (0 === strpos($commentContents, '!')) {
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// YUI Compressor style
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return "\n/*" . substr($commentContents, 1) . "*/\n";
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}
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return preg_match('/^@(?:cc_on|if|elif|else|end)\\b/', $commentContents)
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? "/*{$commentContents}*/" // IE conditional compilation
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: ' ';
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}
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break;
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case null:
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throw new JSMinException('Unterminated comment.');
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}
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$commentContents .= $get;
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}
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default:
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return $get;
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}
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if (ord($c) < self::ORD_SPACE) {
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// control char
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return ' ';
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}
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return $get;
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return $c;
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}
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/**
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* Get next char. If is ctrl character, translate to a space or newline.
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*/
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protected function peek()
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{
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$this->lookAhead = $this->get();
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return $this->lookAhead;
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}
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protected function spaceBeforeRegExp($output)
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/**
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* Is $c a letter, digit, underscore, dollar sign, escape, or non-ASCII?
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*/
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protected function isAlphaNum($c)
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{
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$length = strlen($output);
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$isSpace = false;
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$tmp = "";
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foreach (array("case", "else", "in", "return", "typeof") as $word) {
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if ($length === strlen($word)) {
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$isSpace = ($word === $output);
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} elseif ($length > strlen($word)) {
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$tmp = substr($output, $length - strlen($word) - 1);
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$isSpace = (substr($tmp, 1) === $word) && ! $this->isAlphaNum($tmp[0]);
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}
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if ($isSpace) {
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break;
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return (preg_match('/^[0-9a-zA-Z_\\$\\\\]$/', $c) || ord($c) > 126);
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}
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protected function singleLineComment()
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{
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$comment = '';
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while (true) {
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$get = $this->get();
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$comment .= $get;
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if (ord($get) <= self::ORD_LF) {
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// EOL reached
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if (preg_match('/^\\/@(?:cc_on|if|elif|else|end)\\b/', $comment)) {
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// conditional comment, preserve it
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return "/{$comment}";
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}
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return $get;
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}
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}
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return ($length < 2)
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? true
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: $isSpace;
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}
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protected function multipleLineComment()
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{
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$this->get();
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$comment = '';
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while (true) {
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$get = $this->get();
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if ($get === '*') {
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if ($this->peek() === '/') {
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// end of comment reached
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$this->get();
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if (0 === strpos($comment, '!')) {
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// is YUI Compressor style, keep it
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return "\n/*" . substr($comment, 1) . "*/\n";
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}
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if (preg_match('/^@(?:cc_on|if|elif|else|end)\\b/', $comment)) {
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// is IE conditional, keep it
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return "/*{$comment}*/";
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}
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return ' ';
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}
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} elseif ($get === null) {
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throw new JSMin_UnterminatedCommentException('Contents: ' . $comment);
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}
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$comment .= $get;
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}
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}
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/**
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* Get the next character, skipping over comments.
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* Some comments may be preserved.
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*/
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protected function next()
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{
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$get = $this->get();
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if ($get !== '/') {
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return $get;
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}
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switch ($this->peek()) {
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case '/': return $this->singleLineComment();
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case '*': return $this->multipleLineComment();
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default: return $get;
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}
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}
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}
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class JSMinException extends Exception {
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}
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class JSMin_UnterminatedStringException extends Exception {}
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class JSMin_UnterminatedCommentException extends Exception {}
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class JSMin_UnterminatedRegExpException extends Exception {}
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Reference in New Issue
Block a user