source: frontend/node_modules/terser/lib/compress/native-objects.js

Last change on this file was 9af201e, checked in by MBK <marija.karapandzova@…>, 12 days ago

Fix frontend appearance
  • Property mode set to 100644
File size: 14.2 KB
Line 
1/***********************************************************************
2
3 A JavaScript tokenizer / parser / beautifier / compressor.
4 https://github.com/mishoo/UglifyJS2
5
6 -------------------------------- (C) ---------------------------------
7
8 Author: Mihai Bazon
9 <mihai.bazon@gmail.com>
10 http://mihai.bazon.net/blog
11
12 Distributed under the BSD license:
13
14 Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>
15
16 Redistribution and use in source and binary forms, with or without
17 modification, are permitted provided that the following conditions
18 are met:
19
20 * Redistributions of source code must retain the above
21 copyright notice, this list of conditions and the following
22 disclaimer.
23
24 * Redistributions in binary form must reproduce the above
25 copyright notice, this list of conditions and the following
26 disclaimer in the documentation and/or other materials
27 provided with the distribution.
28
29 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
30 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
32 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
33 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
34 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
35 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
36 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
38 TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
39 THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 SUCH DAMAGE.
41
42 ***********************************************************************/
43
44import { AST_Array, AST_Dot, AST_New, AST_Number, AST_SymbolRef } from "../ast.js";
45import { makePredicate } from "../utils/index.js";
46import { is_undeclared_ref } from "./inference.js";
47
48// Lists of native methods, useful for `unsafe` option which assumes they exist.
49// Note: Lots of methods and functions are missing here, in case they aren't pure
50// or not available in all JS environments.
51
52const make_nested_lookup = (feature_callback) => (compressor) => {
53 const obj = feature_callback(feature_variables(compressor));
54
55 const out = new Map();
56 for (var key of Object.keys(obj)) {
57 if (obj[key]) {
58 out.set(key, makePredicate(remove_false(obj[key])));
59 }
60 }
61
62 const does_have = (global_name, fname) => {
63 const inner_map = out.get(global_name);
64 return inner_map != null && inner_map.has(fname);
65 };
66 return does_have;
67};
68
69const make_lookup = (feature_callback) => (compressor) => {
70 const obj = feature_callback(feature_variables(compressor));
71
72 const predicate = makePredicate(remove_false(obj));
73 const does_have = (global_name) => {
74 return predicate.has(global_name);
75 };
76 return does_have;
77};
78
79function remove_false(arr) {
80 for (let i = 0; i < arr.length; i++) {
81 if (arr[i] === false) {
82 arr.splice(i, 1);
83 i--;
84 }
85 }
86 return arr;
87}
88
89/** Generate the object with arguments seen below */
90function feature_variables(compressor) {
91 return {
92 sloppy: compressor.option("unsafe"),
93 es: compressor.option("builtins_ecma"),
94 };
95}
96
97// eslint-disable-next-line no-unused-vars
98export const pure_access_globals = make_lookup(({ sloppy, es }) => [
99 "Array",
100 "Boolean",
101 "clearInterval",
102 "clearTimeout",
103 "console",
104 "Date",
105 "decodeURI",
106 "decodeURIComponent",
107 "encodeURI",
108 "encodeURIComponent",
109 "Error",
110 "escape",
111 "eval",
112 "EvalError",
113 "Function",
114 es >= 2020 && "globalThis",
115 "isFinite",
116 "isNaN",
117 "JSON",
118 "Math",
119 "Number",
120 "parseFloat",
121 "parseInt",
122 "RangeError",
123 "ReferenceError",
124 "RegExp",
125 "Object",
126 "setInterval",
127 "setTimeout",
128 "String",
129 "SyntaxError",
130 "TypeError",
131 "unescape",
132 "URIError",
133]);
134
135// Objects which are safe to access without throwing or causing a side effect.
136// Usually we'd check the `unsafe` option first but these are way too common for that
137export const pure_prop_access_globals = new Set([
138 "Number",
139 "String",
140 "Array",
141 "Object",
142 "Function",
143 "Promise",
144]);
145
146// eslint-disable-next-line no-unused-vars
147export const is_pure_native_fn = make_lookup(({ sloppy, es }) => [
148 sloppy && es >= 2021 && "AggregateError",
149 "Array",
150 "ArrayBuffer",
151 es >= 2020 && "BigInt",
152 es >= 2020 && "BigInt64Array",
153 es >= 2020 && "BigUint64Array",
154 "Boolean",
155 "Date",
156 sloppy && "decodeURI",
157 sloppy && "decodeURIComponent",
158 sloppy && "encodeURI",
159 sloppy && "encodeURIComponent",
160 "Error",
161 "escape",
162 "EvalError",
163 es >= 2021 && "FinalizationRegistry",
164 es >= 2026 && "Float16Array",
165 "Float32Array",
166 "Float64Array",
167 "Int16Array",
168 "Int32Array",
169 "Int8Array",
170 "isFinite",
171 "isNaN",
172 es >= 2026 && "Iterator",
173 es >= 2015 && "Map",
174 "Number",
175 "parseFloat",
176 "parseInt",
177 es >= 2015 && "Promise",
178 es >= 2015 && "Proxy",
179 "RangeError",
180 "ReferenceError",
181 sloppy && "RegExp",
182 es >= 2015 && "Set",
183 "String",
184 es >= 2015 && "Symbol",
185 "SyntaxError",
186 "TypeError",
187 "Uint16Array",
188 "Uint32Array",
189 "Uint8Array",
190 "Uint8ClampedArray",
191 sloppy && "unescape",
192 "URIError",
193 sloppy && es >= 2015 && "WeakMap",
194 sloppy && es >= 2021 && "WeakRef",
195 sloppy && es >= 2015 && "WeakSet",
196]);
197
198const arg1_is_iterable = new Set([
199 "Map",
200 "Set",
201 "WeakMap",
202 "WeakSet",
203]);
204const arg1_is_range_or_iterable = new Set([
205 "ArrayBuffer",
206 "Float32Array",
207 "Float64Array",
208 "Int16Array",
209 "Int32Array",
210 "Int8Array",
211 "Uint16Array",
212 "Uint32Array",
213 "Uint8Array",
214 "Uint8ClampedArray",
215]);
216const lone_arg_is_range = new Set(["Array"]);
217
218const object_methods = [
219 "constructor",
220 "toString",
221 "valueOf",
222];
223
224// eslint-disable-next-line no-unused-vars
225export const is_pure_native_method = make_nested_lookup(({ sloppy, es }) => ({
226 Array: [
227 es >= 2022 && "at",
228 es >= 2019 && "flat",
229 es >= 2016 && "includes",
230 "indexOf",
231 "join",
232 "lastIndexOf",
233 "slice",
234 ...object_methods,
235 ],
236 Boolean: object_methods,
237 Function: object_methods,
238 Number: [
239 "toExponential",
240 "toFixed",
241 "toPrecision",
242 ...object_methods,
243 ],
244 Object: object_methods,
245 RegExp: [
246 "test",
247 ...object_methods,
248 ],
249 String: [
250 es >= 2022 && "at",
251 "charAt",
252 "charCodeAt",
253 es >= 2015 && "codePointAt",
254 "concat",
255 es >= 2025 && "endsWith",
256 es >= 2015 && "includes",
257 "indexOf",
258 "italics",
259 "lastIndexOf",
260 es >= 2020 && "localeCompare",
261 "match",
262 es >= 2020 && "matchAll",
263 es >= 2015 && "normalize",
264 es >= 2017 && "padStart",
265 es >= 2017 && "padEnd",
266 es >= 2015 && sloppy && "repeat",
267 "replace",
268 es >= 2021 && "replaceAll",
269 "search",
270 "slice",
271 "split",
272 es >= 2015 && "startsWith",
273 "substr",
274 "substring",
275 es >= 2015 && "repeat",
276 "toLocaleLowerCase",
277 "toLocaleUpperCase",
278 "toLowerCase",
279 "toUpperCase",
280 "trim",
281 es >= 2019 && "trimEnd",
282 es >= 2019 && "trimStart",
283 es >= 2019 && "trimLeft",
284 es >= 2019 && "trimRight",
285 ...object_methods,
286 ],
287}));
288
289// eslint-disable-next-line no-unused-vars
290export const is_pure_native_static_fn = make_nested_lookup(({ sloppy, es }) => ({
291 Array: [
292 "isArray",
293 es >= 2015 && "of",
294 ],
295 ArrayBuffer: [
296 "isView",
297 ],
298 BigInt: es >= 2020 && [
299 sloppy && "asIntN",
300 sloppy && "asUintN",
301 ],
302 BigInt64Array: sloppy && es >= 2020 && ["of"],
303 BigUint64Array: sloppy && es >= 2020 && ["of"],
304 Date: [
305 "now",
306 "parse",
307 "UTC",
308 ],
309 Error: [
310 es >= 2026 && "isError",
311 ],
312 Float16Array: sloppy && es >= 2026 && ["of"],
313 Float32Array: sloppy && ["of"],
314 Float64Array: sloppy && ["of"],
315 Int16Array: sloppy && ["of"],
316 Int32Array: sloppy && ["of"],
317 Int8Array: sloppy && ["of"],
318 Math: [
319 "abs",
320 "acos",
321 es >= 2015 && "acosh",
322 "asin",
323 es >= 2015 && "asinh",
324 "atan",
325 "atan2",
326 es >= 2015 && "atanh",
327 es >= 2015 && "cbrt",
328 "ceil",
329 es >= 2015 && "clz32",
330 "cos",
331 es >= 2015 && "cosh",
332 "exp",
333 es >= 2015 && "expm1",
334 "floor",
335 es >= 2026 && "f16round",
336 es >= 2015 && "fround",
337 es >= 2015 && "hypot",
338 es >= 2015 && "imul",
339 "log",
340 es >= 2015 && "log10",
341 es >= 2015 && "log1p",
342 es >= 2015 && "log2",
343 "max",
344 "min",
345 "pow",
346 "round",
347 es >= 2015 && "sign",
348 "sin",
349 es >= 2015 && "sinh",
350 "sqrt",
351 "tan",
352 es >= 2015 && "tanh",
353 es >= 2015 && "trunc",
354 ],
355 Number: [
356 es >= 2015 && "isFinite",
357 es >= 2015 && "isInteger",
358 es >= 2015 && "isSafeInteger",
359 es >= 2015 && "isNaN",
360 es >= 2015 && "parseFloat",
361 es >= 2015 && "parseInt",
362 ],
363 Object: [
364 sloppy && "create",
365 sloppy && "getOwnPropertyDescriptor",
366 es >= 2017 && sloppy && "getOwnPropertyDescriptors",
367 sloppy && "getOwnPropertyNames",
368 es >= 2015 && sloppy && "getOwnPropertySymbols",
369 sloppy && "getPrototypeOf",
370 es >= 2022 && sloppy && "hasOwn",
371 es >= 2015 && "is",
372 "isExtensible",
373 "isFrozen",
374 "isSealed",
375 es >= 2015 && sloppy && "keys",
376 ],
377 Promise: es >= 2015 && [
378 es >= 2024 && "withResolvers",
379 ],
380 Proxy: es >= 2015 && [
381 sloppy && "revocable",
382 ],
383 Reflect: es >= 2015 && [
384 sloppy && "has",
385 sloppy && "isExtensible",
386 sloppy && "ownKeys",
387 ],
388 RegExp: [
389 es >= 2026 && sloppy && "escape",
390 ],
391 String: [
392 "fromCharCode",
393 sloppy && es >= 2025 && "fromCodePoint",
394 ],
395 Uint16Array: ["of"],
396 Uint32Array: ["of"],
397 Uint8Array: ["of"],
398 Uint8ClampedArray: ["of"],
399}));
400
401// Known numeric values which come with JS environments
402// eslint-disable-next-line no-unused-vars
403export const is_pure_native_static_property = make_nested_lookup(({ sloppy, es }) => ({
404 Math: [
405 "E",
406 "LN10",
407 "LN2",
408 "LOG2E",
409 "LOG10E",
410 "PI",
411 "SQRT1_2",
412 "SQRT2",
413 ],
414 Number: [
415 es >= 2015 && "EPSILON",
416 es >= 2015 && "MAX_SAFE_VALUE",
417 "MAX_VALUE",
418 es >= 2015 && "MIN_SAFE_VALUE",
419 "MIN_VALUE",
420 "NaN",
421 "NEGATIVE_INFINITY",
422 "POSITIVE_INFINITY",
423 ],
424 RegExp: [
425 "$_",
426 "$0",
427 "$1",
428 "$2",
429 "$3",
430 "$4",
431 "$5",
432 "$6",
433 "$7",
434 "$8",
435 "$9",
436 "input",
437 "lastMatch",
438 "lastParen",
439 "leftContext",
440 "rightContext",
441 ],
442}));
443
444const re_uppercase_first_letter = /^[A-Z]/;
445export function is_pure_builtin_call(compressor, call) {
446 let builtin = "";
447 let method = "";
448
449 let exp = call.expression;
450 if (is_undeclared_ref(exp)) {
451 builtin = exp.name;
452 } else if (exp instanceof AST_Dot) {
453 method = exp.property;
454
455 exp = exp.expression;
456 if (is_undeclared_ref(exp)) {
457 if (
458 // globalThis.pureFunc()
459 exp.name === "globalThis"
460 && compressor.option("builtins_ecma") >= 2020
461 ) {
462 builtin = method;
463 method = "";
464 } else {
465 // SomeBuiltin.pureFunc()
466 builtin = exp.name;
467 }
468 } else if (exp instanceof AST_Dot) {
469 if (
470 is_undeclared_ref(exp.expression)
471 && exp.expression.name === "globalThis"
472 && compressor.option("builtins_ecma") >= 2020
473 ) {
474 // globalThis.SomeBuiltin.pureFunc()
475 builtin = exp.property;
476 } else {
477 return false;
478 }
479 } else {
480 return false;
481 }
482 } else {
483 return false;
484 }
485
486 if (!method) {
487 if (compressor.is_pure_native_fn(builtin)) {
488 // some require `new`, others throw if you use it
489 const is_new = call instanceof AST_New;
490 const should_be_new = re_uppercase_first_letter.test(builtin); // true of all `is_pure_native_fn`
491 if (is_new !== should_be_new) return false;
492
493 if (!is_builtin_pure_with_these_args(builtin, call.args)) {
494 return false;
495 }
496
497 return true;
498 }
499
500 return false;
501 } else {
502 return compressor.is_pure_native_static_fn(builtin, method);
503 }
504}
505
506/** Some builtins are listed above but their purity is subject to some conditions */
507function is_builtin_pure_with_these_args(builtin, args) {
508 // all the builtins we deal with here are ok with getting 0 args
509 if (args.length === 0) return true;
510
511 let arg1 = args[0];
512 if (arg1 instanceof AST_SymbolRef) {
513 arg1 = arg1.fixed_value();
514 }
515
516 if (lone_arg_is_range.has(builtin)) { // new Array(number)
517 const arg_valid = args.length > 1
518 || arg1 instanceof AST_Number
519 && arg1.value >= 0 && arg1.value <= 0xffffffff;
520 // TODO: or, we are asked to ignore TypeError
521 if (!arg_valid) return false;
522 }
523
524 if (arg1_is_range_or_iterable.has(builtin)) { // new Float32Array(number | Array)
525 const arg_valid = args.length === 0
526 || arg1 instanceof AST_Array
527 || arg1 instanceof AST_Number
528 && arg1.value >= 0 && arg1.value <= 0xffffffff;
529 if (!arg_valid) return false;
530 }
531
532 if (arg1_is_iterable.has(builtin)) { // new Set(iterable)
533 const arg_valid = args.length === 0 || arg1 instanceof AST_Array;
534 if (!arg_valid) return false;
535 }
536
537 return true;
538}
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