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krtmn/includes/BookmarkletGen/BookmarkletGen.php

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2016-04-13 22:02:46 +02:00
<?php
/**
* BookmarkletGen : converts readable Javascript code into a bookmarklet link
*
* Features :
* - removes comments
* - compresses code, not literal strings
* Example:
* function someName( param ) { alert( "this is a string" ) }
* will return:
* function%20someName(param){alert("this is a string")}
* - wraps code into a self invoking function
*
* This is basically a slightly enhanced PHP port of the excellent Bookmarklet Crunchinator
* http://ted.mielczarek.org/code/mozilla/bookmarklet.html
*
*/
class BookmarkletGen {
private $literal_strings = array();
private function __construct__() {}
/**
* Main function, calls all others
*
* @param string $code Javascript code to bookmarkletify
* @return string Bookmarklet link
*/
public function crunch( $code ) {
$out = $code = "(function() {\n" . $code . "\n})();";
$out = $this->replace_strings( $out );
$out = $this->kill_comments( $out );
$out = $this->compress_white_space( $out );
$out = $this->combine_strings( $out );
$out = $this->restore_strings( $out );
$out = $this->encodeURIComponent( $out );
$out = 'javascript:' . $out;
return $out;
}
/**
* PHP port of Javascript function encodeURIComponent
*
* From http://stackoverflow.com/a/1734255/36850
*
* @since
* @param string $str String to encode
* @return string Encoded string
*/
//
private function encodeURIComponent( $str ) {
$revert = array(
'%21'=>'!', '%2A'=>'*', '%28'=>'(', '%29'=>')',
);
return strtr( rawurlencode( $str ), $revert );
}
/**
* Kill comment lines and blocks
*
* @param string $code Commented Javascript code
* @return string Commentless code
*/
private function kill_comments( $code ) {
$code = preg_replace( '!\s*//.+$!m', '', $code );
$code = preg_replace( '!/\*.+?\*/!sm', '', $code ); // s modifier: dot matches new lines
return $code;
}
/**
* Compress white space
*
* Remove some extraneous spaces and make the whole script a one liner
*
* @param string $code Javascript code
* @return string Compressed code
*/
private function compress_white_space( $code ) {
// Tabs to space, no more than 1 consecutive space
$code = preg_replace( '!\t!m', ' ', $code );
$code = preg_replace( '![ ]{2,}!m', ' ', $code );
// Remove uneccessary white space around operators, braces and brackets.
// \xHH sequence is: !%&()*+,-/:;<=>?[]\{|}~
$code = preg_replace( '/\s([\x21\x25\x26\x28\x29\x2a\x2b\x2c\x2d\x2f\x3a\x3b\x3c\x3d\x3e\x3f\x5b\x5d\x5c\x7b\x7c\x7d\x7e])/m', "$1", $code );
$code = preg_replace( '/([\x21\x25\x26\x28\x29\x2a\x2b\x2c\x2d\x2f\x3a\x3b\x3c\x3d\x3e\x3f\x5b\x5d\x5c\x7b\x7c\x7d\x7e])\s/m', "$1", $code );
// Split on each line, trim leading/trailing white space, kill empty lines, combine everything in one line
$code = preg_split( '/\r\n|\r|\n/', $code );
foreach( $code as $i => $line ) {
$code[ $i ] = trim( $line );
}
$code = implode( '', $code );
return $code;
}
/**
* Combine any consecutive strings
*
* In the case we have two consecutive quoted strings (eg: "hello" + "world"), save a couple more
* length and combine them
*
* @param string $code Javascript code
* @return string Javascript code
*/
private function combine_strings( $code ) {
$code = preg_replace('/"\+"/m', "", $code);
$code = preg_replace("/'\+'/m", "", $code);
return $code;
}
/**
* Replace all literal strings (eg: "hello world") with a placeholder and collect them in an array
*
* The idea is that strings cannot be trimmed or white-space optimized: take them out first before uglifying
* the code, then we'll reinject them back in later
*
* @param string $code Javascript code
* @return string Javascript code with placeholders (eg "__1__") instead of literal strings
*/
private function replace_strings( $code ) {
$return = "";
// Split script into individual lines.
$lines = explode("\n", $code);
for( $i = 0; $i < count( $lines ); $i++ ) {
$j = 0;
$inQuote = false;
while ($j < strlen( $lines[$i] ) ) {
$c = $lines[ $i ][ $j ];
// If not already in a string, look for the start of one.
if (!$inQuote) {
if ($c == '"' || $c == "'") {
$inQuote = true;
$escaped = false;
$quoteChar = $c;
$literal = $c;
}
else
$return .= $c;
}
// Already in a string, look for end and copy characters.
else {
if ($c == $quoteChar && !$escaped) {
$inQuote = false;
$literal .= $quoteChar;
$return .= "__" . count( $this->literal_strings ) . "__";
$this->literal_strings[ count( $this->literal_strings ) ] = $literal;
}
else if ($c == "\\" && !$escaped)
$escaped = true;
else
$escaped = false;
$literal .= $c;
}
$j++;
}
$return .= "\n";
}
return $return;
}
/**
* Restore literal strings by replacing their placeholders with actual strings
*
* @param string $code Javascript code with placeholders
* @return string Javascript code with actual strings
*/
function restore_strings( $code ) {
foreach( $this->literal_strings as $i => $string ) {
$code = preg_replace( '/__' . $i . '__/', $string, $code, 1 );
}
return $code;
}
}