6 * @author Paul Copperman <paul.copperman@gmail.com>
7 * @license Choose any of Apache, MIT, GPL, LGPL
11 * This class is meant to safely minify javascript code, while leaving syntactically correct
12 * programs intact. Other libraries, such as JSMin require a certain coding style to work
13 * correctly. OTOH, libraries like jsminplus, that do parse the code correctly are rather
14 * slow, because they construct a complete parse tree before outputting the code minified.
15 * So this class is meant to allow arbitrary (but syntactically correct) input, while being
16 * fast enough to be used for on-the-fly minifying.
18 class JavaScriptMinifier
{
21 * The state machine is only necessary to decide whether to parse a slash as division
22 * operator or as regexp literal.
23 * States are named after the next expected item. We only distinguish states when the
24 * distinction is relevant for our purpose.
28 const PROPERTY_ASSIGNMENT
= 2;
30 const EXPRESSION_NO_NL
= 4; // only relevant for semicolon insertion
31 const EXPRESSION_OP
= 5;
32 const EXPRESSION_FUNC
= 6;
33 const EXPRESSION_TERNARY
= 7; // used to determine the role of a colon
34 const EXPRESSION_TERNARY_OP
= 8;
35 const EXPRESSION_TERNARY_FUNC
= 9;
36 const PAREN_EXPRESSION
= 10; // expression which is not on the top level
37 const PAREN_EXPRESSION_OP
= 11;
38 const PAREN_EXPRESSION_FUNC
= 12;
39 const PROPERTY_EXPRESSION
= 13; // expression which is within an object literal
40 const PROPERTY_EXPRESSION_OP
= 14;
41 const PROPERTY_EXPRESSION_FUNC
= 15;
44 const TYPE_UN_OP
= 1; // unary operators
45 const TYPE_INCR_OP
= 2; // ++ and --
46 const TYPE_BIN_OP
= 3; // binary operators
47 const TYPE_ADD_OP
= 4; // + and - which can be either unary or binary ops
48 const TYPE_HOOK
= 5; // ?
49 const TYPE_COLON
= 6; // :
50 const TYPE_COMMA
= 7; // ,
51 const TYPE_SEMICOLON
= 8; // ;
52 const TYPE_BRACE_OPEN
= 9; // {
53 const TYPE_BRACE_CLOSE
= 10; // }
54 const TYPE_PAREN_OPEN
= 11; // ( and [
55 const TYPE_PAREN_CLOSE
= 12; // ) and ]
56 const TYPE_RETURN
= 13; // keywords: break, continue, return, throw
57 const TYPE_IF
= 14; // keywords: catch, for, with, switch, while, if
58 const TYPE_DO
= 15; // keywords: case, var, finally, else, do, try
59 const TYPE_FUNC
= 16; // keywords: function
60 const TYPE_LITERAL
= 17; // all literals, identifiers and unrecognised tokens
62 // Sanity limit to avoid excessive memory usage
63 const STACK_LIMIT
= 1000;
66 * NOTE: This isn't a strict maximum. Longer lines will be produced when
67 * literals (e.g. quoted strings) longer than this are encountered
68 * or when required to guard against semicolon insertion.
70 const MAX_LINE_LENGTH
= 1000;
73 * Returns minified JavaScript code.
75 * @param string $s JavaScript code to minify
76 * @return String Minified code
78 public static function minify( $s ) {
79 // First we declare a few tables that contain our parsing rules
81 // $opChars : characters, which can be combined without whitespace in between them
111 // $tokenTypes : maps keywords and operators to their corresponding token type
113 '!' => self
::TYPE_UN_OP
,
114 '~' => self
::TYPE_UN_OP
,
115 'delete' => self
::TYPE_UN_OP
,
116 'new' => self
::TYPE_UN_OP
,
117 'typeof' => self
::TYPE_UN_OP
,
118 'void' => self
::TYPE_UN_OP
,
119 '++' => self
::TYPE_INCR_OP
,
120 '--' => self
::TYPE_INCR_OP
,
121 '!=' => self
::TYPE_BIN_OP
,
122 '!==' => self
::TYPE_BIN_OP
,
123 '%' => self
::TYPE_BIN_OP
,
124 '%=' => self
::TYPE_BIN_OP
,
125 '&' => self
::TYPE_BIN_OP
,
126 '&&' => self
::TYPE_BIN_OP
,
127 '&=' => self
::TYPE_BIN_OP
,
128 '*' => self
::TYPE_BIN_OP
,
129 '*=' => self
::TYPE_BIN_OP
,
130 '+=' => self
::TYPE_BIN_OP
,
131 '-=' => self
::TYPE_BIN_OP
,
132 '.' => self
::TYPE_BIN_OP
,
133 '/' => self
::TYPE_BIN_OP
,
134 '/=' => self
::TYPE_BIN_OP
,
135 '<' => self
::TYPE_BIN_OP
,
136 '<<' => self
::TYPE_BIN_OP
,
137 '<<=' => self
::TYPE_BIN_OP
,
138 '<=' => self
::TYPE_BIN_OP
,
139 '=' => self
::TYPE_BIN_OP
,
140 '==' => self
::TYPE_BIN_OP
,
141 '===' => self
::TYPE_BIN_OP
,
142 '>' => self
::TYPE_BIN_OP
,
143 '>=' => self
::TYPE_BIN_OP
,
144 '>>' => self
::TYPE_BIN_OP
,
145 '>>=' => self
::TYPE_BIN_OP
,
146 '>>>' => self
::TYPE_BIN_OP
,
147 '>>>=' => self
::TYPE_BIN_OP
,
148 '^' => self
::TYPE_BIN_OP
,
149 '^=' => self
::TYPE_BIN_OP
,
150 '|' => self
::TYPE_BIN_OP
,
151 '|=' => self
::TYPE_BIN_OP
,
152 '||' => self
::TYPE_BIN_OP
,
153 'in' => self
::TYPE_BIN_OP
,
154 'instanceof' => self
::TYPE_BIN_OP
,
155 '+' => self
::TYPE_ADD_OP
,
156 '-' => self
::TYPE_ADD_OP
,
157 '?' => self
::TYPE_HOOK
,
158 ':' => self
::TYPE_COLON
,
159 ',' => self
::TYPE_COMMA
,
160 ';' => self
::TYPE_SEMICOLON
,
161 '{' => self
::TYPE_BRACE_OPEN
,
162 '}' => self
::TYPE_BRACE_CLOSE
,
163 '(' => self
::TYPE_PAREN_OPEN
,
164 '[' => self
::TYPE_PAREN_OPEN
,
165 ')' => self
::TYPE_PAREN_CLOSE
,
166 ']' => self
::TYPE_PAREN_CLOSE
,
167 'break' => self
::TYPE_RETURN
,
168 'continue' => self
::TYPE_RETURN
,
169 'return' => self
::TYPE_RETURN
,
170 'throw' => self
::TYPE_RETURN
,
171 'catch' => self
::TYPE_IF
,
172 'for' => self
::TYPE_IF
,
173 'if' => self
::TYPE_IF
,
174 'switch' => self
::TYPE_IF
,
175 'while' => self
::TYPE_IF
,
176 'with' => self
::TYPE_IF
,
177 'case' => self
::TYPE_DO
,
178 'do' => self
::TYPE_DO
,
179 'else' => self
::TYPE_DO
,
180 'finally' => self
::TYPE_DO
,
181 'try' => self
::TYPE_DO
,
182 'var' => self
::TYPE_DO
,
183 'function' => self
::TYPE_FUNC
186 // $goto : This is the main table for our state machine. For every state/token pair
187 // the following state is defined. When no rule exists for a given pair,
188 // the state is left unchanged.
191 self
::TYPE_UN_OP
=> self
::EXPRESSION
,
192 self
::TYPE_INCR_OP
=> self
::EXPRESSION
,
193 self
::TYPE_ADD_OP
=> self
::EXPRESSION
,
194 self
::TYPE_PAREN_OPEN
=> self
::PAREN_EXPRESSION
,
195 self
::TYPE_RETURN
=> self
::EXPRESSION_NO_NL
,
196 self
::TYPE_IF
=> self
::CONDITION
,
197 self
::TYPE_FUNC
=> self
::CONDITION
,
198 self
::TYPE_LITERAL
=> self
::EXPRESSION_OP
201 self
::TYPE_PAREN_OPEN
=> self
::PAREN_EXPRESSION
203 self
::PROPERTY_ASSIGNMENT
=> [
204 self
::TYPE_COLON
=> self
::PROPERTY_EXPRESSION
,
205 self
::TYPE_BRACE_OPEN
=> self
::STATEMENT
207 self
::EXPRESSION
=> [
208 self
::TYPE_SEMICOLON
=> self
::STATEMENT
,
209 self
::TYPE_BRACE_OPEN
=> self
::PROPERTY_ASSIGNMENT
,
210 self
::TYPE_PAREN_OPEN
=> self
::PAREN_EXPRESSION
,
211 self
::TYPE_FUNC
=> self
::EXPRESSION_FUNC
,
212 self
::TYPE_LITERAL
=> self
::EXPRESSION_OP
214 self
::EXPRESSION_NO_NL
=> [
215 self
::TYPE_SEMICOLON
=> self
::STATEMENT
,
216 self
::TYPE_BRACE_OPEN
=> self
::PROPERTY_ASSIGNMENT
,
217 self
::TYPE_PAREN_OPEN
=> self
::PAREN_EXPRESSION
,
218 self
::TYPE_FUNC
=> self
::EXPRESSION_FUNC
,
219 self
::TYPE_LITERAL
=> self
::EXPRESSION_OP
221 self
::EXPRESSION_OP
=> [
222 self
::TYPE_BIN_OP
=> self
::EXPRESSION
,
223 self
::TYPE_ADD_OP
=> self
::EXPRESSION
,
224 self
::TYPE_HOOK
=> self
::EXPRESSION_TERNARY
,
225 self
::TYPE_COLON
=> self
::STATEMENT
,
226 self
::TYPE_COMMA
=> self
::EXPRESSION
,
227 self
::TYPE_SEMICOLON
=> self
::STATEMENT
,
228 self
::TYPE_PAREN_OPEN
=> self
::PAREN_EXPRESSION
230 self
::EXPRESSION_FUNC
=> [
231 self
::TYPE_BRACE_OPEN
=> self
::STATEMENT
233 self
::EXPRESSION_TERNARY
=> [
234 self
::TYPE_BRACE_OPEN
=> self
::PROPERTY_ASSIGNMENT
,
235 self
::TYPE_PAREN_OPEN
=> self
::PAREN_EXPRESSION
,
236 self
::TYPE_FUNC
=> self
::EXPRESSION_TERNARY_FUNC
,
237 self
::TYPE_LITERAL
=> self
::EXPRESSION_TERNARY_OP
239 self
::EXPRESSION_TERNARY_OP
=> [
240 self
::TYPE_BIN_OP
=> self
::EXPRESSION_TERNARY
,
241 self
::TYPE_ADD_OP
=> self
::EXPRESSION_TERNARY
,
242 self
::TYPE_HOOK
=> self
::EXPRESSION_TERNARY
,
243 self
::TYPE_COMMA
=> self
::EXPRESSION_TERNARY
,
244 self
::TYPE_PAREN_OPEN
=> self
::PAREN_EXPRESSION
246 self
::EXPRESSION_TERNARY_FUNC
=> [
247 self
::TYPE_BRACE_OPEN
=> self
::STATEMENT
249 self
::PAREN_EXPRESSION
=> [
250 self
::TYPE_BRACE_OPEN
=> self
::PROPERTY_ASSIGNMENT
,
251 self
::TYPE_PAREN_OPEN
=> self
::PAREN_EXPRESSION
,
252 self
::TYPE_FUNC
=> self
::PAREN_EXPRESSION_FUNC
,
253 self
::TYPE_LITERAL
=> self
::PAREN_EXPRESSION_OP
255 self
::PAREN_EXPRESSION_OP
=> [
256 self
::TYPE_BIN_OP
=> self
::PAREN_EXPRESSION
,
257 self
::TYPE_ADD_OP
=> self
::PAREN_EXPRESSION
,
258 self
::TYPE_HOOK
=> self
::PAREN_EXPRESSION
,
259 self
::TYPE_COLON
=> self
::PAREN_EXPRESSION
,
260 self
::TYPE_COMMA
=> self
::PAREN_EXPRESSION
,
261 self
::TYPE_SEMICOLON
=> self
::PAREN_EXPRESSION
,
262 self
::TYPE_PAREN_OPEN
=> self
::PAREN_EXPRESSION
264 self
::PAREN_EXPRESSION_FUNC
=> [
265 self
::TYPE_BRACE_OPEN
=> self
::STATEMENT
267 self
::PROPERTY_EXPRESSION
=> [
268 self
::TYPE_BRACE_OPEN
=> self
::PROPERTY_ASSIGNMENT
,
269 self
::TYPE_PAREN_OPEN
=> self
::PAREN_EXPRESSION
,
270 self
::TYPE_FUNC
=> self
::PROPERTY_EXPRESSION_FUNC
,
271 self
::TYPE_LITERAL
=> self
::PROPERTY_EXPRESSION_OP
273 self
::PROPERTY_EXPRESSION_OP
=> [
274 self
::TYPE_BIN_OP
=> self
::PROPERTY_EXPRESSION
,
275 self
::TYPE_ADD_OP
=> self
::PROPERTY_EXPRESSION
,
276 self
::TYPE_HOOK
=> self
::PROPERTY_EXPRESSION
,
277 self
::TYPE_COMMA
=> self
::PROPERTY_ASSIGNMENT
,
278 self
::TYPE_PAREN_OPEN
=> self
::PAREN_EXPRESSION
280 self
::PROPERTY_EXPRESSION_FUNC
=> [
281 self
::TYPE_BRACE_OPEN
=> self
::STATEMENT
285 // $push : This table contains the rules for when to push a state onto the stack.
286 // The pushed state is the state to return to when the corresponding
287 // closing token is found
290 self
::TYPE_BRACE_OPEN
=> self
::STATEMENT
,
291 self
::TYPE_PAREN_OPEN
=> self
::EXPRESSION_OP
294 self
::TYPE_PAREN_OPEN
=> self
::STATEMENT
296 self
::PROPERTY_ASSIGNMENT
=> [
297 self
::TYPE_BRACE_OPEN
=> self
::PROPERTY_ASSIGNMENT
299 self
::EXPRESSION
=> [
300 self
::TYPE_BRACE_OPEN
=> self
::EXPRESSION_OP
,
301 self
::TYPE_PAREN_OPEN
=> self
::EXPRESSION_OP
303 self
::EXPRESSION_NO_NL
=> [
304 self
::TYPE_BRACE_OPEN
=> self
::EXPRESSION_OP
,
305 self
::TYPE_PAREN_OPEN
=> self
::EXPRESSION_OP
307 self
::EXPRESSION_OP
=> [
308 self
::TYPE_HOOK
=> self
::EXPRESSION
,
309 self
::TYPE_PAREN_OPEN
=> self
::EXPRESSION_OP
311 self
::EXPRESSION_FUNC
=> [
312 self
::TYPE_BRACE_OPEN
=> self
::EXPRESSION_OP
314 self
::EXPRESSION_TERNARY
=> [
315 self
::TYPE_BRACE_OPEN
=> self
::EXPRESSION_TERNARY_OP
,
316 self
::TYPE_PAREN_OPEN
=> self
::EXPRESSION_TERNARY_OP
318 self
::EXPRESSION_TERNARY_OP
=> [
319 self
::TYPE_HOOK
=> self
::EXPRESSION_TERNARY
,
320 self
::TYPE_PAREN_OPEN
=> self
::EXPRESSION_TERNARY_OP
322 self
::EXPRESSION_TERNARY_FUNC
=> [
323 self
::TYPE_BRACE_OPEN
=> self
::EXPRESSION_TERNARY_OP
325 self
::PAREN_EXPRESSION
=> [
326 self
::TYPE_BRACE_OPEN
=> self
::PAREN_EXPRESSION_OP
,
327 self
::TYPE_PAREN_OPEN
=> self
::PAREN_EXPRESSION_OP
329 self
::PAREN_EXPRESSION_OP
=> [
330 self
::TYPE_PAREN_OPEN
=> self
::PAREN_EXPRESSION_OP
332 self
::PAREN_EXPRESSION_FUNC
=> [
333 self
::TYPE_BRACE_OPEN
=> self
::PAREN_EXPRESSION_OP
335 self
::PROPERTY_EXPRESSION
=> [
336 self
::TYPE_BRACE_OPEN
=> self
::PROPERTY_EXPRESSION_OP
,
337 self
::TYPE_PAREN_OPEN
=> self
::PROPERTY_EXPRESSION_OP
339 self
::PROPERTY_EXPRESSION_OP
=> [
340 self
::TYPE_PAREN_OPEN
=> self
::PROPERTY_EXPRESSION_OP
342 self
::PROPERTY_EXPRESSION_FUNC
=> [
343 self
::TYPE_BRACE_OPEN
=> self
::PROPERTY_EXPRESSION_OP
347 // $pop : Rules for when to pop a state from the stack
349 self
::STATEMENT
=> [ self
::TYPE_BRACE_CLOSE
=> true ],
350 self
::PROPERTY_ASSIGNMENT
=> [ self
::TYPE_BRACE_CLOSE
=> true ],
351 self
::EXPRESSION
=> [ self
::TYPE_BRACE_CLOSE
=> true ],
352 self
::EXPRESSION_NO_NL
=> [ self
::TYPE_BRACE_CLOSE
=> true ],
353 self
::EXPRESSION_OP
=> [ self
::TYPE_BRACE_CLOSE
=> true ],
354 self
::EXPRESSION_TERNARY_OP
=> [ self
::TYPE_COLON
=> true ],
355 self
::PAREN_EXPRESSION
=> [ self
::TYPE_PAREN_CLOSE
=> true ],
356 self
::PAREN_EXPRESSION_OP
=> [ self
::TYPE_PAREN_CLOSE
=> true ],
357 self
::PROPERTY_EXPRESSION
=> [ self
::TYPE_BRACE_CLOSE
=> true ],
358 self
::PROPERTY_EXPRESSION_OP
=> [ self
::TYPE_BRACE_CLOSE
=> true ]
361 // $semicolon : Rules for when a semicolon insertion is appropriate
363 self
::EXPRESSION_NO_NL
=> [
364 self
::TYPE_UN_OP
=> true,
365 self
::TYPE_INCR_OP
=> true,
366 self
::TYPE_ADD_OP
=> true,
367 self
::TYPE_BRACE_OPEN
=> true,
368 self
::TYPE_PAREN_OPEN
=> true,
369 self
::TYPE_RETURN
=> true,
370 self
::TYPE_IF
=> true,
371 self
::TYPE_DO
=> true,
372 self
::TYPE_FUNC
=> true,
373 self
::TYPE_LITERAL
=> true
375 self
::EXPRESSION_OP
=> [
376 self
::TYPE_UN_OP
=> true,
377 self
::TYPE_INCR_OP
=> true,
378 self
::TYPE_BRACE_OPEN
=> true,
379 self
::TYPE_RETURN
=> true,
380 self
::TYPE_IF
=> true,
381 self
::TYPE_DO
=> true,
382 self
::TYPE_FUNC
=> true,
383 self
::TYPE_LITERAL
=> true
387 // $divStates : Contains all states that can be followed by a division operator
389 self
::EXPRESSION_OP
=> true,
390 self
::EXPRESSION_TERNARY_OP
=> true,
391 self
::PAREN_EXPRESSION_OP
=> true,
392 self
::PROPERTY_EXPRESSION_OP
=> true
395 // Here's where the minifying takes place: Loop through the input, looking for tokens
396 // and output them to $out, taking actions to the above defined rules when appropriate.
399 $length = strlen( $s );
401 $newlineFound = true;
402 $state = self
::STATEMENT
;
404 $last = ';'; // Pretend that we have seen a semicolon yet
405 while ( $pos < $length ) {
406 // First, skip over any whitespace and multiline comments, recording whether we
407 // found any newline character
408 $skip = strspn( $s, " \t\n\r\xb\xc", $pos );
411 if ( $ch === '/' && substr( $s, $pos, 2 ) === '/*' ) {
412 // Multiline comment. Search for the end token or EOT.
413 $end = strpos( $s, '*/', $pos +
2 );
414 $skip = $end === false ?
$length - $pos : $end - $pos +
2;
418 // The semicolon insertion mechanism needs to know whether there was a newline
419 // between two tokens, so record it now.
420 if ( !$newlineFound && strcspn( $s, "\r\n", $pos, $skip ) !== $skip ) {
421 $newlineFound = true;
426 // Handle C++-style comments and html comments, which are treated as single line
427 // comments by the browser, regardless of whether the end tag is on the same line.
428 // Handle --> the same way, but only if it's at the beginning of the line
429 if ( ( $ch === '/' && substr( $s, $pos, 2 ) === '//' )
430 ||
( $ch === '<' && substr( $s, $pos, 4 ) === '<!--' )
431 ||
( $ch === '-' && $newlineFound && substr( $s, $pos, 3 ) === '-->' )
433 $pos +
= strcspn( $s, "\r\n", $pos );
437 // Find out which kind of token we're handling.
438 // Note: $end must point past the end of the current token
439 // so that `substr($s, $pos, $end - $pos)` would be the entire token.
440 // In order words, $end will be the offset of the last relevant character
441 // in the stream + 1, or simply put: The offset of the first character
442 // of any next token in the stream.
444 // Handle string literals
445 if ( $ch === "'" ||
$ch === '"' ) {
446 // Search to the end of the string literal, skipping over backslash escapes
447 $search = $ch . '\\';
449 // Speculatively add 2 to the end so that if we see a backslash,
450 // the next iteration will start 2 characters further (one for the
451 // backslash, one for the escaped character).
452 // We'll correct this outside the loop.
453 $end +
= strcspn( $s, $search, $end ) +
2;
454 // If the last character in our search for a quote or a backlash
455 // matched a backslash and we haven't reached the end, keep searching..
456 } while ( $end - 2 < $length && $s[$end - 2] === '\\' );
457 // Correction (1): Undo speculative add, keep only one (end of string literal)
459 if ( $end > $length ) {
460 // Correction (2): Loop wrongly assumed an end quote ended the search,
461 // but search ended because we've reached the end. Correct $end.
462 // TODO: This is invalid and should throw.
465 // We have to distinguish between regexp literals and division operators
466 // A division operator is only possible in certain states
467 } elseif ( $ch === '/' && !isset( $divStates[$state] ) ) {
470 // Search until we find "/" (end of regexp), "\" (backslash escapes),
471 // or "[" (start of character classes).
473 // Speculatively add 2 to ensure next iteration skips
474 // over backslash and escaped character.
475 // We'll correct this outside the loop.
476 $end +
= strcspn( $s, '/[\\', $end ) +
2;
477 // If backslash escape, keep searching...
478 } while ( $end - 2 < $length && $s[$end - 2] === '\\' );
479 // Correction (1): Undo speculative add, keep only one (end of regexp)
481 if ( $end > $length ) {
482 // Correction (2): Loop wrongly assumed end slash was seen
483 // String ended without end of regexp. Correct $end.
484 // TODO: This is invalid and should throw.
488 if ( $s[$end - 1] === '/' ) {
491 // (Implicit else), we must've found the start of a char class,
492 // skip until we find "]" (end of char class), or "\" (backslash escape)
494 // Speculatively add 2 for backslash escape.
495 // We'll substract one outside the loop.
496 $end +
= strcspn( $s, ']\\', $end ) +
2;
497 // If backslash escape, keep searching...
498 } while ( $end - 2 < $length && $s[$end - 2] === '\\' );
499 // Correction (1): Undo speculative add, keep only one (end of regexp)
501 if ( $end > $length ) {
502 // Correction (2): Loop wrongly assumed "]" was seen
503 // String ended without ending char class or regexp. Correct $end.
504 // TODO: This is invalid and should throw.
509 // Search past the regexp modifiers (gi)
510 while ( $end < $length && ctype_alpha( $s[$end] ) ) {
515 && ( $pos +
1 < $length ) && ( $s[$pos +
1] === 'x' ||
$s[$pos +
1] === 'X' )
517 // Hex numeric literal
519 $len = strspn( $s, '0123456789ABCDEFabcdef', $end );
521 return self
::parseError(
524 'Expected a hexadecimal number but found ' . substr( $s, $pos, 5 ) . '...'
530 ||
( $ch === '.' && $pos +
1 < $length && ctype_digit( $s[$pos +
1] ) )
532 $end +
= strspn( $s, '0123456789', $end );
533 $decimal = strspn( $s, '.', $end );
535 if ( $decimal > 2 ) {
536 return self
::parseError( $s, $end, 'The number has too many decimal points' );
538 $end +
= strspn( $s, '0123456789', $end +
1 ) +
$decimal;
540 $exponent = strspn( $s, 'eE', $end );
542 if ( $exponent > 1 ) {
543 return self
::parseError( $s, $end, 'Number with several E' );
547 // + sign is optional; - sign is required.
548 $end +
= strspn( $s, '-+', $end );
549 $len = strspn( $s, '0123456789', $end );
551 return self
::parseError(
554 'No decimal digits after e, how many zeroes should be added?'
559 } elseif ( isset( $opChars[$ch] ) ) {
560 // Punctuation character. Search for the longest matching operator.
563 && isset( $tokenTypes[substr( $s, $pos, $end - $pos +
1 )] )
568 // Identifier or reserved word. Search for the end by excluding whitespace and
570 $end +
= strcspn( $s, " \t\n.;,=<>+-{}()[]?:*/%'\"!&|^~\xb\xc\r", $end );
573 // Now get the token type from our type array
574 $token = substr( $s, $pos, $end - $pos ); // so $end - $pos == strlen( $token )
575 $type = isset( $tokenTypes[$token] ) ?
$tokenTypes[$token] : self
::TYPE_LITERAL
;
577 if ( $newlineFound && isset( $semicolon[$state][$type] ) ) {
578 // This token triggers the semicolon insertion mechanism of javascript. While we
579 // could add the ; token here ourselves, keeping the newline has a few advantages.
581 $state = self
::STATEMENT
;
583 } elseif ( $lineLength +
$end - $pos > self
::MAX_LINE_LENGTH
&&
584 !isset( $semicolon[$state][$type] ) && $type !== self
::TYPE_INCR_OP
) {
585 // This line would get too long if we added $token, so add a newline first.
586 // Only do this if it won't trigger semicolon insertion and if it won't
587 // put a postfix increment operator on its own line, which is illegal in js.
590 // Check, whether we have to separate the token from the last one with whitespace
591 } elseif ( !isset( $opChars[$last] ) && !isset( $opChars[$ch] ) ) {
594 // Don't accidentally create ++, -- or // tokens
595 } elseif ( $last === $ch && ( $ch === '+' ||
$ch === '-' ||
$ch === '/' ) ) {
600 $type === self
::TYPE_LITERAL
601 && ( $token === 'true' ||
$token === 'false' )
602 && ( $state === self
::EXPRESSION ||
$state === self
::PROPERTY_EXPRESSION
)
605 $token = ( $token === 'true' ) ?
'!0' : '!1';
609 $lineLength +
= $end - $pos; // += strlen( $token )
610 $last = $s[$end - 1];
612 $newlineFound = false;
614 // Now that we have output our token, transition into the new state.
615 if ( isset( $push[$state][$type] ) && count( $stack ) < self
::STACK_LIMIT
) {
616 $stack[] = $push[$state][$type];
618 if ( $stack && isset( $pop[$state][$type] ) ) {
619 $state = array_pop( $stack );
620 } elseif ( isset( $goto[$state][$type] ) ) {
621 $state = $goto[$state][$type];
627 static function parseError( $fullJavascript, $position, $errorMsg ) {
628 // TODO: Handle the error: trigger_error, throw exception, return false...