<?php
+// @codingStandardsIgnoreFile File external to MediaWiki. Ignore coding conventions checks.
/**
* JavaScript Minifier
*
+ * @file
+ * @author Paul Copperman <paul.copperman@gmail.com>
+ * @license Choose any of Apache, MIT, GPL, LGPL
+ */
+
+/**
* This class is meant to safely minify javascript code, while leaving syntactically correct
* programs intact. Other libraries, such as JSMin require a certain coding style to work
* correctly. OTOH, libraries like jsminplus, that do parse the code correctly are rather
* slow, because they construct a complete parse tree before outputting the code minified.
* So this class is meant to allow arbitrary (but syntactically correct) input, while being
* fast enough to be used for on-the-fly minifying.
- *
- * Author: Paul Copperman <paul.copperman@gmail.com>
- * License: choose any of Apache, MIT, GPL, LGPL
*/
-
class JavaScriptMinifier {
/* Class constants */
const TYPE_DO = 15; // keywords: case, var, finally, else, do, try
const TYPE_FUNC = 16; // keywords: function
const TYPE_LITERAL = 17; // all literals, identifiers and unrecognised tokens
-
+
// Sanity limit to avoid excessive memory usage
const STACK_LIMIT = 1000;
* literals (e.g. quoted strings) longer than $maxLineLength are encountered
* or when required to guard against semicolon insertion.
*
- * @param $s String JavaScript code to minify
- * @param $statementsOnOwnLine Bool Whether to put each statement on its own line
- * @param $maxLineLength Int Maximum length of a single line, or -1 for no maximum.
+ * @param string $s JavaScript code to minify
+ * @param bool $statementsOnOwnLine Whether to put each statement on its own line
+ * @param int $maxLineLength Maximum length of a single line, or -1 for no maximum.
* @return String Minified code
*/
public static function minify( $s, $statementsOnOwnLine = false, $maxLineLength = 1000 ) {
self::TYPE_LITERAL => true
)
);
-
+
// Rules for when newlines should be inserted if
// $statementsOnOwnLine is enabled.
// $newlineBefore is checked before switching state,
$end += strspn( $s, '0123456789', $end );
$decimal = strspn( $s, '.', $end );
if ($decimal) {
- if ( $decimal > 1 ) {
- return self::parseError($s, $end, 'The number has several decimal points' );
+ if ( $decimal > 2 ) {
+ return self::parseError($s, $end, 'The number has too many decimal points' );
}
- $end += strspn( $s, '0123456789', $end ) + 1;
+ $end += strspn( $s, '0123456789', $end + 1 ) + $decimal;
}
$exponent = strspn( $s, 'eE', $end );
if( $exponent ) {
return self::parseError($s, $end, 'Number with several E' );
}
$end++;
-
+
// + sign is optional; - sign is required.
$end += strspn( $s, '-+', $end );
$len = strspn( $s, '0123456789', $end );
$out .= ' ';
$lineLength++;
}
-
+
$out .= $token;
$lineLength += $end - $pos; // += strlen( $token )
$last = $s[$end - 1];
$pos = $end;
$newlineFound = false;
-
+
// Output a newline after the token if required
// This is checked before AND after switching state
$newlineAdded = false;
} elseif( isset( $goto[$state][$type] ) ) {
$state = $goto[$state][$type];
}
-
+
// Check for newline insertion again
if ( $statementsOnOwnLine && !$newlineAdded && isset( $newlineAfter[$state][$type] ) ) {
$out .= "\n";
}
return $out;
}
-
+
static function parseError($fullJavascript, $position, $errorMsg) {
// TODO: Handle the error: trigger_error, throw exception, return false...
return false;