<?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,
while( $end < $length && ctype_alpha( $s[$end] ) ) {
$end++;
}
+ } elseif(
+ $ch === '0'
+ && ($pos + 1 < $length) && ($s[$pos + 1] === 'x' || $s[$pos + 1] === 'X' )
+ ) {
+ // Hex numeric literal
+ $end++; // x or X
+ $len = strspn( $s, '0123456789ABCDEFabcdef', $end );
+ if ( !$len ) {
+ return self::parseError($s, $pos, 'Expected a hexadecimal number but found ' . substr( $s, $pos, 5 ) . '...' );
+ }
+ $end += $len;
} elseif(
ctype_digit( $ch )
|| ( $ch === '.' && $pos + 1 < $length && ctype_digit( $s[$pos + 1] ) )
) {
- // Numeric literal. Search for the end of it, but don't care about [+-]exponent
- // at the end, as the results of "numeric [+-] numeric" and "numeric" are
- // identical to our state machine.
- $end += strspn( $s, '0123456789ABCDEFabcdefXx.', $end );
- while( $s[$end - 1] === '.' ) {
- // Special case: When a numeric ends with a dot, we have to check the
- // literal for proper syntax
- $decimal = strspn( $s, '0123456789', $pos, $end - $pos - 1 );
- if( $decimal === $end - $pos - 1 ) {
- break;
- } else {
- $end--;
+ $end += strspn( $s, '0123456789', $end );
+ $decimal = strspn( $s, '.', $end );
+ if ($decimal) {
+ if ( $decimal > 2 ) {
+ return self::parseError($s, $end, 'The number has too many decimal points' );
}
+ $end += strspn( $s, '0123456789', $end + 1 ) + $decimal;
+ }
+ $exponent = strspn( $s, 'eE', $end );
+ if( $exponent ) {
+ if ( $exponent > 1 ) {
+ return self::parseError($s, $end, 'Number with several E' );
+ }
+ $end++;
+
+ // + sign is optional; - sign is required.
+ $end += strspn( $s, '-+', $end );
+ $len = strspn( $s, '0123456789', $end );
+ if ( !$len ) {
+ return self::parseError($s, $pos, 'No decimal digits after e, how many zeroes should be added?' );
+ }
+ $end += $len;
}
} elseif( isset( $opChars[$ch] ) ) {
// Punctuation character. Search for the longest matching operator.
$out .= ' ';
$lineLength++;
}
-
+ if (
+ $type === self::TYPE_LITERAL
+ && ( $token === 'true' || $token === 'false' )
+ && ( $state === self::EXPRESSION || $state === self::PROPERTY_EXPRESSION )
+ && $last !== '.'
+ ) {
+ $token = ( $token === 'true' ) ? '!0' : '!1';
+ }
+
$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;
+ }
}
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