/usr/share/mediawiki/includes/libs/JavaScriptMinifier.php is in mediawiki-classes 1:1.27.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 | <?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.
*/
class JavaScriptMinifier {
/* Class constants */
/* Parsing states.
* The state machine is only necessary to decide whether to parse a slash as division
* operator or as regexp literal.
* States are named after the next expected item. We only distinguish states when the
* distinction is relevant for our purpose.
*/
const STATEMENT = 0;
const CONDITION = 1;
const PROPERTY_ASSIGNMENT = 2;
const EXPRESSION = 3;
const EXPRESSION_NO_NL = 4; // only relevant for semicolon insertion
const EXPRESSION_OP = 5;
const EXPRESSION_FUNC = 6;
const EXPRESSION_TERNARY = 7; // used to determine the role of a colon
const EXPRESSION_TERNARY_OP = 8;
const EXPRESSION_TERNARY_FUNC = 9;
const PAREN_EXPRESSION = 10; // expression which is not on the top level
const PAREN_EXPRESSION_OP = 11;
const PAREN_EXPRESSION_FUNC = 12;
const PROPERTY_EXPRESSION = 13; // expression which is within an object literal
const PROPERTY_EXPRESSION_OP = 14;
const PROPERTY_EXPRESSION_FUNC = 15;
/* Token types */
const TYPE_UN_OP = 1; // unary operators
const TYPE_INCR_OP = 2; // ++ and --
const TYPE_BIN_OP = 3; // binary operators
const TYPE_ADD_OP = 4; // + and - which can be either unary or binary ops
const TYPE_HOOK = 5; // ?
const TYPE_COLON = 6; // :
const TYPE_COMMA = 7; // ,
const TYPE_SEMICOLON = 8; // ;
const TYPE_BRACE_OPEN = 9; // {
const TYPE_BRACE_CLOSE = 10; // }
const TYPE_PAREN_OPEN = 11; // ( and [
const TYPE_PAREN_CLOSE = 12; // ) and ]
const TYPE_RETURN = 13; // keywords: break, continue, return, throw
const TYPE_IF = 14; // keywords: catch, for, with, switch, while, if
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;
/* Static functions */
/**
* Returns minified JavaScript code.
*
* NOTE: $maxLineLength isn't a strict maximum. Longer lines will be produced when
* literals (e.g. quoted strings) longer than $maxLineLength are encountered
* or when required to guard against semicolon insertion.
*
* @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 ) {
// First we declare a few tables that contain our parsing rules
// $opChars : characters, which can be combined without whitespace in between them
$opChars = array(
'!' => true,
'"' => true,
'%' => true,
'&' => true,
"'" => true,
'(' => true,
')' => true,
'*' => true,
'+' => true,
',' => true,
'-' => true,
'.' => true,
'/' => true,
':' => true,
';' => true,
'<' => true,
'=' => true,
'>' => true,
'?' => true,
'[' => true,
']' => true,
'^' => true,
'{' => true,
'|' => true,
'}' => true,
'~' => true
);
// $tokenTypes : maps keywords and operators to their corresponding token type
$tokenTypes = array(
'!' => self::TYPE_UN_OP,
'~' => self::TYPE_UN_OP,
'delete' => self::TYPE_UN_OP,
'new' => self::TYPE_UN_OP,
'typeof' => self::TYPE_UN_OP,
'void' => self::TYPE_UN_OP,
'++' => self::TYPE_INCR_OP,
'--' => self::TYPE_INCR_OP,
'!=' => self::TYPE_BIN_OP,
'!==' => self::TYPE_BIN_OP,
'%' => self::TYPE_BIN_OP,
'%=' => self::TYPE_BIN_OP,
'&' => self::TYPE_BIN_OP,
'&&' => self::TYPE_BIN_OP,
'&=' => self::TYPE_BIN_OP,
'*' => self::TYPE_BIN_OP,
'*=' => self::TYPE_BIN_OP,
'+=' => self::TYPE_BIN_OP,
'-=' => self::TYPE_BIN_OP,
'.' => self::TYPE_BIN_OP,
'/' => self::TYPE_BIN_OP,
'/=' => self::TYPE_BIN_OP,
'<' => self::TYPE_BIN_OP,
'<<' => self::TYPE_BIN_OP,
'<<=' => self::TYPE_BIN_OP,
'<=' => self::TYPE_BIN_OP,
'=' => self::TYPE_BIN_OP,
'==' => self::TYPE_BIN_OP,
'===' => self::TYPE_BIN_OP,
'>' => self::TYPE_BIN_OP,
'>=' => self::TYPE_BIN_OP,
'>>' => self::TYPE_BIN_OP,
'>>=' => self::TYPE_BIN_OP,
'>>>' => self::TYPE_BIN_OP,
'>>>=' => self::TYPE_BIN_OP,
'^' => self::TYPE_BIN_OP,
'^=' => self::TYPE_BIN_OP,
'|' => self::TYPE_BIN_OP,
'|=' => self::TYPE_BIN_OP,
'||' => self::TYPE_BIN_OP,
'in' => self::TYPE_BIN_OP,
'instanceof' => self::TYPE_BIN_OP,
'+' => self::TYPE_ADD_OP,
'-' => self::TYPE_ADD_OP,
'?' => self::TYPE_HOOK,
':' => self::TYPE_COLON,
',' => self::TYPE_COMMA,
';' => self::TYPE_SEMICOLON,
'{' => self::TYPE_BRACE_OPEN,
'}' => self::TYPE_BRACE_CLOSE,
'(' => self::TYPE_PAREN_OPEN,
'[' => self::TYPE_PAREN_OPEN,
')' => self::TYPE_PAREN_CLOSE,
']' => self::TYPE_PAREN_CLOSE,
'break' => self::TYPE_RETURN,
'continue' => self::TYPE_RETURN,
'return' => self::TYPE_RETURN,
'throw' => self::TYPE_RETURN,
'catch' => self::TYPE_IF,
'for' => self::TYPE_IF,
'if' => self::TYPE_IF,
'switch' => self::TYPE_IF,
'while' => self::TYPE_IF,
'with' => self::TYPE_IF,
'case' => self::TYPE_DO,
'do' => self::TYPE_DO,
'else' => self::TYPE_DO,
'finally' => self::TYPE_DO,
'try' => self::TYPE_DO,
'var' => self::TYPE_DO,
'function' => self::TYPE_FUNC
);
// $goto : This is the main table for our state machine. For every state/token pair
// the following state is defined. When no rule exists for a given pair,
// the state is left unchanged.
$goto = array(
self::STATEMENT => array(
self::TYPE_UN_OP => self::EXPRESSION,
self::TYPE_INCR_OP => self::EXPRESSION,
self::TYPE_ADD_OP => self::EXPRESSION,
self::TYPE_PAREN_OPEN => self::PAREN_EXPRESSION,
self::TYPE_RETURN => self::EXPRESSION_NO_NL,
self::TYPE_IF => self::CONDITION,
self::TYPE_FUNC => self::CONDITION,
self::TYPE_LITERAL => self::EXPRESSION_OP
),
self::CONDITION => array(
self::TYPE_PAREN_OPEN => self::PAREN_EXPRESSION
),
self::PROPERTY_ASSIGNMENT => array(
self::TYPE_COLON => self::PROPERTY_EXPRESSION,
self::TYPE_BRACE_OPEN => self::STATEMENT
),
self::EXPRESSION => array(
self::TYPE_SEMICOLON => self::STATEMENT,
self::TYPE_BRACE_OPEN => self::PROPERTY_ASSIGNMENT,
self::TYPE_PAREN_OPEN => self::PAREN_EXPRESSION,
self::TYPE_FUNC => self::EXPRESSION_FUNC,
self::TYPE_LITERAL => self::EXPRESSION_OP
),
self::EXPRESSION_NO_NL => array(
self::TYPE_SEMICOLON => self::STATEMENT,
self::TYPE_BRACE_OPEN => self::PROPERTY_ASSIGNMENT,
self::TYPE_PAREN_OPEN => self::PAREN_EXPRESSION,
self::TYPE_FUNC => self::EXPRESSION_FUNC,
self::TYPE_LITERAL => self::EXPRESSION_OP
),
self::EXPRESSION_OP => array(
self::TYPE_BIN_OP => self::EXPRESSION,
self::TYPE_ADD_OP => self::EXPRESSION,
self::TYPE_HOOK => self::EXPRESSION_TERNARY,
self::TYPE_COLON => self::STATEMENT,
self::TYPE_COMMA => self::EXPRESSION,
self::TYPE_SEMICOLON => self::STATEMENT,
self::TYPE_PAREN_OPEN => self::PAREN_EXPRESSION
),
self::EXPRESSION_FUNC => array(
self::TYPE_BRACE_OPEN => self::STATEMENT
),
self::EXPRESSION_TERNARY => array(
self::TYPE_BRACE_OPEN => self::PROPERTY_ASSIGNMENT,
self::TYPE_PAREN_OPEN => self::PAREN_EXPRESSION,
self::TYPE_FUNC => self::EXPRESSION_TERNARY_FUNC,
self::TYPE_LITERAL => self::EXPRESSION_TERNARY_OP
),
self::EXPRESSION_TERNARY_OP => array(
self::TYPE_BIN_OP => self::EXPRESSION_TERNARY,
self::TYPE_ADD_OP => self::EXPRESSION_TERNARY,
self::TYPE_HOOK => self::EXPRESSION_TERNARY,
self::TYPE_COMMA => self::EXPRESSION_TERNARY,
self::TYPE_PAREN_OPEN => self::PAREN_EXPRESSION
),
self::EXPRESSION_TERNARY_FUNC => array(
self::TYPE_BRACE_OPEN => self::STATEMENT
),
self::PAREN_EXPRESSION => array(
self::TYPE_BRACE_OPEN => self::PROPERTY_ASSIGNMENT,
self::TYPE_PAREN_OPEN => self::PAREN_EXPRESSION,
self::TYPE_FUNC => self::PAREN_EXPRESSION_FUNC,
self::TYPE_LITERAL => self::PAREN_EXPRESSION_OP
),
self::PAREN_EXPRESSION_OP => array(
self::TYPE_BIN_OP => self::PAREN_EXPRESSION,
self::TYPE_ADD_OP => self::PAREN_EXPRESSION,
self::TYPE_HOOK => self::PAREN_EXPRESSION,
self::TYPE_COLON => self::PAREN_EXPRESSION,
self::TYPE_COMMA => self::PAREN_EXPRESSION,
self::TYPE_SEMICOLON => self::PAREN_EXPRESSION,
self::TYPE_PAREN_OPEN => self::PAREN_EXPRESSION
),
self::PAREN_EXPRESSION_FUNC => array(
self::TYPE_BRACE_OPEN => self::STATEMENT
),
self::PROPERTY_EXPRESSION => array(
self::TYPE_BRACE_OPEN => self::PROPERTY_ASSIGNMENT,
self::TYPE_PAREN_OPEN => self::PAREN_EXPRESSION,
self::TYPE_FUNC => self::PROPERTY_EXPRESSION_FUNC,
self::TYPE_LITERAL => self::PROPERTY_EXPRESSION_OP
),
self::PROPERTY_EXPRESSION_OP => array(
self::TYPE_BIN_OP => self::PROPERTY_EXPRESSION,
self::TYPE_ADD_OP => self::PROPERTY_EXPRESSION,
self::TYPE_HOOK => self::PROPERTY_EXPRESSION,
self::TYPE_COMMA => self::PROPERTY_ASSIGNMENT,
self::TYPE_PAREN_OPEN => self::PAREN_EXPRESSION
),
self::PROPERTY_EXPRESSION_FUNC => array(
self::TYPE_BRACE_OPEN => self::STATEMENT
)
);
// $push : This table contains the rules for when to push a state onto the stack.
// The pushed state is the state to return to when the corresponding
// closing token is found
$push = array(
self::STATEMENT => array(
self::TYPE_BRACE_OPEN => self::STATEMENT,
self::TYPE_PAREN_OPEN => self::EXPRESSION_OP
),
self::CONDITION => array(
self::TYPE_PAREN_OPEN => self::STATEMENT
),
self::PROPERTY_ASSIGNMENT => array(
self::TYPE_BRACE_OPEN => self::PROPERTY_ASSIGNMENT
),
self::EXPRESSION => array(
self::TYPE_BRACE_OPEN => self::EXPRESSION_OP,
self::TYPE_PAREN_OPEN => self::EXPRESSION_OP
),
self::EXPRESSION_NO_NL => array(
self::TYPE_BRACE_OPEN => self::EXPRESSION_OP,
self::TYPE_PAREN_OPEN => self::EXPRESSION_OP
),
self::EXPRESSION_OP => array(
self::TYPE_HOOK => self::EXPRESSION,
self::TYPE_PAREN_OPEN => self::EXPRESSION_OP
),
self::EXPRESSION_FUNC => array(
self::TYPE_BRACE_OPEN => self::EXPRESSION_OP
),
self::EXPRESSION_TERNARY => array(
self::TYPE_BRACE_OPEN => self::EXPRESSION_TERNARY_OP,
self::TYPE_PAREN_OPEN => self::EXPRESSION_TERNARY_OP
),
self::EXPRESSION_TERNARY_OP => array(
self::TYPE_HOOK => self::EXPRESSION_TERNARY,
self::TYPE_PAREN_OPEN => self::EXPRESSION_TERNARY_OP
),
self::EXPRESSION_TERNARY_FUNC => array(
self::TYPE_BRACE_OPEN => self::EXPRESSION_TERNARY_OP
),
self::PAREN_EXPRESSION => array(
self::TYPE_BRACE_OPEN => self::PAREN_EXPRESSION_OP,
self::TYPE_PAREN_OPEN => self::PAREN_EXPRESSION_OP
),
self::PAREN_EXPRESSION_OP => array(
self::TYPE_PAREN_OPEN => self::PAREN_EXPRESSION_OP
),
self::PAREN_EXPRESSION_FUNC => array(
self::TYPE_BRACE_OPEN => self::PAREN_EXPRESSION_OP
),
self::PROPERTY_EXPRESSION => array(
self::TYPE_BRACE_OPEN => self::PROPERTY_EXPRESSION_OP,
self::TYPE_PAREN_OPEN => self::PROPERTY_EXPRESSION_OP
),
self::PROPERTY_EXPRESSION_OP => array(
self::TYPE_PAREN_OPEN => self::PROPERTY_EXPRESSION_OP
),
self::PROPERTY_EXPRESSION_FUNC => array(
self::TYPE_BRACE_OPEN => self::PROPERTY_EXPRESSION_OP
)
);
// $pop : Rules for when to pop a state from the stack
$pop = array(
self::STATEMENT => array( self::TYPE_BRACE_CLOSE => true ),
self::PROPERTY_ASSIGNMENT => array( self::TYPE_BRACE_CLOSE => true ),
self::EXPRESSION => array( self::TYPE_BRACE_CLOSE => true ),
self::EXPRESSION_NO_NL => array( self::TYPE_BRACE_CLOSE => true ),
self::EXPRESSION_OP => array( self::TYPE_BRACE_CLOSE => true ),
self::EXPRESSION_TERNARY_OP => array( self::TYPE_COLON => true ),
self::PAREN_EXPRESSION => array( self::TYPE_PAREN_CLOSE => true ),
self::PAREN_EXPRESSION_OP => array( self::TYPE_PAREN_CLOSE => true ),
self::PROPERTY_EXPRESSION => array( self::TYPE_BRACE_CLOSE => true ),
self::PROPERTY_EXPRESSION_OP => array( self::TYPE_BRACE_CLOSE => true )
);
// $semicolon : Rules for when a semicolon insertion is appropriate
$semicolon = array(
self::EXPRESSION_NO_NL => array(
self::TYPE_UN_OP => true,
self::TYPE_INCR_OP => true,
self::TYPE_ADD_OP => true,
self::TYPE_BRACE_OPEN => true,
self::TYPE_PAREN_OPEN => true,
self::TYPE_RETURN => true,
self::TYPE_IF => true,
self::TYPE_DO => true,
self::TYPE_FUNC => true,
self::TYPE_LITERAL => true
),
self::EXPRESSION_OP => array(
self::TYPE_UN_OP => true,
self::TYPE_INCR_OP => true,
self::TYPE_BRACE_OPEN => true,
self::TYPE_RETURN => true,
self::TYPE_IF => true,
self::TYPE_DO => true,
self::TYPE_FUNC => true,
self::TYPE_LITERAL => true
)
);
// Rules for when newlines should be inserted if
// $statementsOnOwnLine is enabled.
// $newlineBefore is checked before switching state,
// $newlineAfter is checked after
$newlineBefore = array(
self::STATEMENT => array(
self::TYPE_BRACE_CLOSE => true,
),
);
$newlineAfter = array(
self::STATEMENT => array(
self::TYPE_BRACE_OPEN => true,
self::TYPE_PAREN_CLOSE => true,
self::TYPE_SEMICOLON => true,
),
);
// $divStates : Contains all states that can be followed by a division operator
$divStates = array(
self::EXPRESSION_OP => true,
self::EXPRESSION_TERNARY_OP => true,
self::PAREN_EXPRESSION_OP => true,
self::PROPERTY_EXPRESSION_OP => true
);
// Here's where the minifying takes place: Loop through the input, looking for tokens
// and output them to $out, taking actions to the above defined rules when appropriate.
$out = '';
$pos = 0;
$length = strlen( $s );
$lineLength = 0;
$newlineFound = true;
$state = self::STATEMENT;
$stack = array();
$last = ';'; // Pretend that we have seen a semicolon yet
while( $pos < $length ) {
// First, skip over any whitespace and multiline comments, recording whether we
// found any newline character
$skip = strspn( $s, " \t\n\r\xb\xc", $pos );
if( !$skip ) {
$ch = $s[$pos];
if( $ch === '/' && substr( $s, $pos, 2 ) === '/*' ) {
// Multiline comment. Search for the end token or EOT.
$end = strpos( $s, '*/', $pos + 2 );
$skip = $end === false ? $length - $pos : $end - $pos + 2;
}
}
if( $skip ) {
// The semicolon insertion mechanism needs to know whether there was a newline
// between two tokens, so record it now.
if( !$newlineFound && strcspn( $s, "\r\n", $pos, $skip ) !== $skip ) {
$newlineFound = true;
}
$pos += $skip;
continue;
}
// Handle C++-style comments and html comments, which are treated as single line
// comments by the browser, regardless of whether the end tag is on the same line.
// Handle --> the same way, but only if it's at the beginning of the line
if( ( $ch === '/' && substr( $s, $pos, 2 ) === '//' )
|| ( $ch === '<' && substr( $s, $pos, 4 ) === '<!--' )
|| ( $ch === '-' && $newlineFound && substr( $s, $pos, 3 ) === '-->' )
) {
$pos += strcspn( $s, "\r\n", $pos );
continue;
}
// Find out which kind of token we're handling. $end will point past the end of it.
$end = $pos + 1;
// Handle string literals
if( $ch === "'" || $ch === '"' ) {
// Search to the end of the string literal, skipping over backslash escapes
$search = $ch . '\\';
do{
$end += strcspn( $s, $search, $end ) + 2;
} while( $end - 2 < $length && $s[$end - 2] === '\\' );
$end--;
// We have to distinguish between regexp literals and division operators
// A division operator is only possible in certain states
} elseif( $ch === '/' && !isset( $divStates[$state] ) ) {
// Regexp literal, search to the end, skipping over backslash escapes and
// character classes
for( ; ; ) {
do{
$end += strcspn( $s, '/[\\', $end ) + 2;
} while( $end - 2 < $length && $s[$end - 2] === '\\' );
$end--;
if( $end - 1 >= $length || $s[$end - 1] === '/' ) {
break;
}
do{
$end += strcspn( $s, ']\\', $end ) + 2;
} while( $end - 2 < $length && $s[$end - 2] === '\\' );
$end--;
};
// Search past the regexp modifiers (gi)
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] ) )
) {
$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.
while(
$end < $length
&& isset( $tokenTypes[substr( $s, $pos, $end - $pos + 1 )] )
) {
$end++;
}
} else {
// Identifier or reserved word. Search for the end by excluding whitespace and
// punctuation.
$end += strcspn( $s, " \t\n.;,=<>+-{}()[]?:*/%'\"!&|^~\xb\xc\r", $end );
}
// Now get the token type from our type array
$token = substr( $s, $pos, $end - $pos ); // so $end - $pos == strlen( $token )
$type = isset( $tokenTypes[$token] ) ? $tokenTypes[$token] : self::TYPE_LITERAL;
if( $newlineFound && isset( $semicolon[$state][$type] ) ) {
// This token triggers the semicolon insertion mechanism of javascript. While we
// could add the ; token here ourselves, keeping the newline has a few advantages.
$out .= "\n";
$state = self::STATEMENT;
$lineLength = 0;
} elseif( $maxLineLength > 0 && $lineLength + $end - $pos > $maxLineLength &&
!isset( $semicolon[$state][$type] ) && $type !== self::TYPE_INCR_OP )
{
// This line would get too long if we added $token, so add a newline first.
// Only do this if it won't trigger semicolon insertion and if it won't
// put a postfix increment operator on its own line, which is illegal in js.
$out .= "\n";
$lineLength = 0;
// Check, whether we have to separate the token from the last one with whitespace
} elseif( !isset( $opChars[$last] ) && !isset( $opChars[$ch] ) ) {
$out .= ' ';
$lineLength++;
// Don't accidentally create ++, -- or // tokens
} elseif( $last === $ch && ( $ch === '+' || $ch === '-' || $ch === '/' ) ) {
$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;
if ( $statementsOnOwnLine && !$newlineAdded && isset( $newlineBefore[$state][$type] ) ) {
$out .= "\n";
$lineLength = 0;
$newlineAdded = true;
}
// Now that we have output our token, transition into the new state.
if( isset( $push[$state][$type] ) && count( $stack ) < self::STACK_LIMIT ) {
$stack[] = $push[$state][$type];
}
if( $stack && isset( $pop[$state][$type] ) ) {
$state = array_pop( $stack );
} elseif( isset( $goto[$state][$type] ) ) {
$state = $goto[$state][$type];
}
// Check for newline insertion again
if ( $statementsOnOwnLine && !$newlineAdded && isset( $newlineAfter[$state][$type] ) ) {
$out .= "\n";
$lineLength = 0;
}
}
return $out;
}
static function parseError($fullJavascript, $position, $errorMsg) {
// TODO: Handle the error: trigger_error, throw exception, return false...
return false;
}
}
|