+++ /dev/null
-<?php
-/*
- * This file is part of the JShrink package.
- *
- * (c) Robert Hafner <tedivm@tedivm.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-/**
- * JShrink
- *
- *
- * @package JShrink
- * @author Robert Hafner <tedivm@tedivm.com>
- */
-
-namespace JShrink;
-
-/**
- * Minifier
- *
- * Usage - Minifier::minify($js);
- * Usage - Minifier::minify($js, $options);
- * Usage - Minifier::minify($js, array('flaggedComments' => false));
- *
- * @package JShrink
- * @author Robert Hafner <tedivm@tedivm.com>
- * @license http://www.opensource.org/licenses/bsd-license.php BSD License
- */
-class Minifier
-{
- /**
- * The input javascript to be minified.
- *
- * @var string
- */
- protected $input;
-
- /**
- * The location of the character (in the input string) that is next to be
- * processed.
- *
- * @var int
- */
- protected $index = 0;
-
- /**
- * The first of the characters currently being looked at.
- *
- * @var string
- */
- protected $a = '';
-
- /**
- * The next character being looked at (after a);
- *
- * @var string
- */
- protected $b = '';
-
- /**
- * This character is only active when certain look ahead actions take place.
- *
- * @var string
- */
- protected $c;
-
- /**
- * Contains the options for the current minification process.
- *
- * @var array
- */
- protected $options;
-
- /**
- * Contains the default options for minification. This array is merged with
- * the one passed in by the user to create the request specific set of
- * options (stored in the $options attribute).
- *
- * @var array
- */
- protected static $defaultOptions = array('flaggedComments' => true);
-
- /**
- * Contains lock ids which are used to replace certain code patterns and
- * prevent them from being minified
- *
- * @var array
- */
- protected $locks = array();
-
- /**
- * Takes a string containing javascript and removes unneeded characters in
- * order to shrink the code without altering it's functionality.
- *
- * @param string $js The raw javascript to be minified
- * @param array $options Various runtime options in an associative array
- * @throws \Exception
- * @return bool|string
- */
- public static function minify($js, $options = array())
- {
- try {
- ob_start();
-
- $jshrink = new Minifier();
- $js = $jshrink->lock($js);
- $jshrink->minifyDirectToOutput($js, $options);
-
- // Sometimes there's a leading new line, so we trim that out here.
- $js = ltrim(ob_get_clean());
- $js = $jshrink->unlock($js);
- unset($jshrink);
-
- return $js;
-
- } catch (\Exception $e) {
-
- if (isset($jshrink)) {
- // Since the breakdownScript function probably wasn't finished
- // we clean it out before discarding it.
- $jshrink->clean();
- unset($jshrink);
- }
-
- // without this call things get weird, with partially outputted js.
- ob_end_clean();
- throw $e;
- }
- }
-
- /**
- * Processes a javascript string and outputs only the required characters,
- * stripping out all unneeded characters.
- *
- * @param string $js The raw javascript to be minified
- * @param array $options Various runtime options in an associative array
- */
- protected function minifyDirectToOutput($js, $options)
- {
- $this->initialize($js, $options);
- $this->loop();
- $this->clean();
- }
-
- /**
- * Initializes internal variables, normalizes new lines,
- *
- * @param string $js The raw javascript to be minified
- * @param array $options Various runtime options in an associative array
- */
- protected function initialize($js, $options)
- {
- $this->options = array_merge(static::$defaultOptions, $options);
- $js = str_replace("\r\n", "\n", $js);
- $js = str_replace('/**/', '', $js);
- $this->input = str_replace("\r", "\n", $js);
-
- // We add a newline to the end of the script to make it easier to deal
- // with comments at the bottom of the script- this prevents the unclosed
- // comment error that can otherwise occur.
- $this->input .= PHP_EOL;
-
- // Populate "a" with a new line, "b" with the first character, before
- // entering the loop
- $this->a = "\n";
- $this->b = $this->getReal();
- }
-
- /**
- * The primary action occurs here. This function loops through the input string,
- * outputting anything that's relevant and discarding anything that is not.
- */
- protected function loop()
- {
- while ($this->a !== false && !is_null($this->a) && $this->a !== '') {
-
- switch ($this->a) {
- // new lines
- case "\n":
- // if the next line is something that can't stand alone preserve the newline
- if (strpos('(-+{[@', $this->b) !== false) {
- echo $this->a;
- $this->saveString();
- break;
- }
-
- // if B is a space we skip the rest of the switch block and go down to the
- // string/regex check below, resetting $this->b with getReal
- if($this->b === ' ')
- break;
-
- // otherwise we treat the newline like a space
-
- case ' ':
- if(static::isAlphaNumeric($this->b))
- echo $this->a;
-
- $this->saveString();
- break;
-
- default:
- switch ($this->b) {
- case "\n":
- if (strpos('}])+-"\'', $this->a) !== false) {
- echo $this->a;
- $this->saveString();
- break;
- } else {
- if (static::isAlphaNumeric($this->a)) {
- echo $this->a;
- $this->saveString();
- }
- }
- break;
-
- case ' ':
- if(!static::isAlphaNumeric($this->a))
- break;
-
- default:
- // check for some regex that breaks stuff
- if ($this->a === '/' && ($this->b === '\'' || $this->b === '"')) {
- $this->saveRegex();
- continue;
- }
-
- echo $this->a;
- $this->saveString();
- break;
- }
- }
-
- // do reg check of doom
- $this->b = $this->getReal();
-
- if(($this->b == '/' && strpos('(,=:[!&|?', $this->a) !== false))
- $this->saveRegex();
- }
- }
-
- /**
- * Resets attributes that do not need to be stored between requests so that
- * the next request is ready to go. Another reason for this is to make sure
- * the variables are cleared and are not taking up memory.
- */
- protected function clean()
- {
- unset($this->input);
- $this->index = 0;
- $this->a = $this->b = '';
- unset($this->c);
- unset($this->options);
- }
-
- /**
- * Returns the next string for processing based off of the current index.
- *
- * @return string
- */
- protected function getChar()
- {
- // Check to see if we had anything in the look ahead buffer and use that.
- if (isset($this->c)) {
- $char = $this->c;
- unset($this->c);
-
- // Otherwise we start pulling from the input.
- } else {
- $char = substr($this->input, $this->index, 1);
-
- // If the next character doesn't exist return false.
- if (isset($char) && $char === false) {
- return false;
- }
-
- // Otherwise increment the pointer and use this char.
- $this->index++;
- }
-
- // Normalize all whitespace except for the newline character into a
- // standard space.
- if($char !== "\n" && ord($char) < 32)
-
- return ' ';
-
- return $char;
- }
-
- /**
- * This function gets the next "real" character. It is essentially a wrapper
- * around the getChar function that skips comments. This has significant
- * performance benefits as the skipping is done using native functions (ie,
- * c code) rather than in script php.
- *
- *
- * @return string Next 'real' character to be processed.
- * @throws \RuntimeException
- */
- protected function getReal()
- {
- $startIndex = $this->index;
- $char = $this->getChar();
-
- // Check to see if we're potentially in a comment
- if ($char !== '/') {
- return $char;
- }
-
- $this->c = $this->getChar();
-
- if ($this->c === '/') {
- return $this->processOneLineComments($startIndex);
-
- } elseif ($this->c === '*') {
- return $this->processMultiLineComments($startIndex);
- }
-
- return $char;
- }
-
- /**
- * Removed one line comments, with the exception of some very specific types of
- * conditional comments.
- *
- * @param int $startIndex The index point where "getReal" function started
- * @return string
- */
- protected function processOneLineComments($startIndex)
- {
- $thirdCommentString = substr($this->input, $this->index, 1);
-
- // kill rest of line
- $this->getNext("\n");
-
- if ($thirdCommentString == '@') {
- $endPoint = $this->index - $startIndex;
- unset($this->c);
- $char = "\n" . substr($this->input, $startIndex, $endPoint);
- } else {
- // first one is contents of $this->c
- $this->getChar();
- $char = $this->getChar();
- }
-
- return $char;
- }
-
- /**
- * Skips multiline comments where appropriate, and includes them where needed.
- * Conditional comments and "license" style blocks are preserved.
- *
- * @param int $startIndex The index point where "getReal" function started
- * @return bool|string False if there's no character
- * @throws \RuntimeException Unclosed comments will throw an error
- */
- protected function processMultiLineComments($startIndex)
- {
- $this->getChar(); // current C
- $thirdCommentString = $this->getChar();
-
- // kill everything up to the next */ if it's there
- if ($this->getNext('*/')) {
-
- $this->getChar(); // get *
- $this->getChar(); // get /
- $char = $this->getChar(); // get next real character
-
- // Now we reinsert conditional comments and YUI-style licensing comments
- if (($this->options['flaggedComments'] && $thirdCommentString === '!')
- || ($thirdCommentString === '@') ) {
-
- // If conditional comments or flagged comments are not the first thing in the script
- // we need to echo a and fill it with a space before moving on.
- if ($startIndex > 0) {
- echo $this->a;
- $this->a = " ";
-
- // If the comment started on a new line we let it stay on the new line
- if ($this->input[($startIndex - 1)] === "\n") {
- echo "\n";
- }
- }
-
- $endPoint = ($this->index - 1) - $startIndex;
- echo substr($this->input, $startIndex, $endPoint);
-
- return $char;
- }
-
- } else {
- $char = false;
- }
-
- if($char === false)
- throw new \RuntimeException('Unclosed multiline comment at position: ' . ($this->index - 2));
-
- // if we're here c is part of the comment and therefore tossed
- if(isset($this->c))
- unset($this->c);
-
- return $char;
- }
-
- /**
- * Pushes the index ahead to the next instance of the supplied string. If it
- * is found the first character of the string is returned and the index is set
- * to it's position.
- *
- * @param string $string
- * @return string|false Returns the first character of the string or false.
- */
- protected function getNext($string)
- {
- // Find the next occurrence of "string" after the current position.
- $pos = strpos($this->input, $string, $this->index);
-
- // If it's not there return false.
- if($pos === false)
-
- return false;
-
- // Adjust position of index to jump ahead to the asked for string
- $this->index = $pos;
-
- // Return the first character of that string.
- return substr($this->input, $this->index, 1);
- }
-
- /**
- * When a javascript string is detected this function crawls for the end of
- * it and saves the whole string.
- *
- * @throws \RuntimeException Unclosed strings will throw an error
- */
- protected function saveString()
- {
- $startpos = $this->index;
-
- // saveString is always called after a gets cleared, so we push b into
- // that spot.
- $this->a = $this->b;
-
- // If this isn't a string we don't need to do anything.
- if ($this->a !== "'" && $this->a !== '"') {
- return;
- }
-
- // String type is the quote used, " or '
- $stringType = $this->a;
-
- // Echo out that starting quote
- echo $this->a;
-
- // Loop until the string is done
- while (true) {
-
- // Grab the very next character and load it into a
- $this->a = $this->getChar();
-
- switch ($this->a) {
-
- // If the string opener (single or double quote) is used
- // output it and break out of the while loop-
- // The string is finished!
- case $stringType:
- break 2;
-
- // New lines in strings without line delimiters are bad- actual
- // new lines will be represented by the string \n and not the actual
- // character, so those will be treated just fine using the switch
- // block below.
- case "\n":
- throw new \RuntimeException('Unclosed string at position: ' . $startpos );
- break;
-
- // Escaped characters get picked up here. If it's an escaped new line it's not really needed
- case '\\':
-
- // a is a slash. We want to keep it, and the next character,
- // unless it's a new line. New lines as actual strings will be
- // preserved, but escaped new lines should be reduced.
- $this->b = $this->getChar();
-
- // If b is a new line we discard a and b and restart the loop.
- if ($this->b === "\n") {
- break;
- }
-
- // echo out the escaped character and restart the loop.
- echo $this->a . $this->b;
- break;
-
-
- // Since we're not dealing with any special cases we simply
- // output the character and continue our loop.
- default:
- echo $this->a;
- }
- }
- }
-
- /**
- * When a regular expression is detected this function crawls for the end of
- * it and saves the whole regex.
- *
- * @throws \RuntimeException Unclosed regex will throw an error
- */
- protected function saveRegex()
- {
- echo $this->a . $this->b;
-
- while (($this->a = $this->getChar()) !== false) {
- if($this->a === '/')
- break;
-
- if ($this->a === '\\') {
- echo $this->a;
- $this->a = $this->getChar();
- }
-
- if($this->a === "\n")
- throw new \RuntimeException('Unclosed regex pattern at position: ' . $this->index);
-
- echo $this->a;
- }
- $this->b = $this->getReal();
- }
-
- /**
- * Checks to see if a character is alphanumeric.
- *
- * @param string $char Just one character
- * @return bool
- */
- protected static function isAlphaNumeric($char)
- {
- return preg_match('/^[\w\$\pL]$/', $char) === 1 || $char == '/';
- }
-
- /**
- * Replace patterns in the given string and store the replacement
- *
- * @param string $js The string to lock
- * @return bool
- */
- protected function lock($js)
- {
- /* lock things like <code>"asd" + ++x;</code> */
- $lock = '"LOCK---' . crc32(time()) . '"';
-
- $matches = array();
- preg_match('/([+-])(\s+)([+-])/S', $js, $matches);
- if (empty($matches)) {
- return $js;
- }
-
- $this->locks[$lock] = $matches[2];
-
- $js = preg_replace('/([+-])\s+([+-])/S', "$1{$lock}$2", $js);
- /* -- */
-
- return $js;
- }
-
- /**
- * Replace "locks" with the original characters
- *
- * @param string $js The string to unlock
- * @return bool
- */
- protected function unlock($js)
- {
- if (empty($this->locks)) {
- return $js;
- }
-
- foreach ($this->locks as $lock => $replacement) {
- $js = str_replace($lock, $replacement, $js);
- }
-
- return $js;
- }
-
-}
git.wh0rd.org / tt-rss.git / blobdiff