code.delx.au - gnu-emacs-elpa/blob - tests/parser.el

   1 ;;; tests/parser.el --- Some tests for js2-mode.
   2
   3 ;; Copyright (C) 2009, 2011-2013  Free Software Foundation, Inc.
   4
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; GNU Emacs is free software: you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation, either version 3 of the License, or
  10 ;; (at your option) any later version.
  11
  12 ;; GNU Emacs is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 ;;; Code:
  21
  22 (require 'ert)
  23 (require 'ert-x)
  24 (require 'js2-mode)
  25 (require 'cl-lib)
  26
  27 (defmacro js2-deftest (name buffer-contents &rest body)
  28   (declare (indent defun))
  29   `(ert-deftest ,(intern (format "js2-%s" name)) ()
  30      (with-temp-buffer
  31        (save-excursion
  32          (insert ,buffer-contents))
  33        (unwind-protect
  34            (progn
  35              ,@body)
  36          (fundamental-mode)))))
  37
  38 (defun js2-mode--and-parse ()
  39   (js2-mode)
  40   (js2-reparse))
  41
  42 (defun js2-test-string-to-ast (s)
  43   (insert s)
  44   (js2-mode--and-parse)
  45   (should (null js2-mode-buffer-dirty-p))
  46   js2-mode-ast)
  47
  48 (cl-defun js2-test-parse-string (code-string &key syntax-error errors-count
  49                                              reference warnings-count)
  50   (ert-with-test-buffer (:name 'origin)
  51     (let ((ast (js2-test-string-to-ast code-string)))
  52       (if syntax-error
  53           (let ((errors (js2-ast-root-errors ast)))
  54             (should (= (or errors-count 1) (length errors)))
  55             (cl-destructuring-bind (_ pos len) (car (last errors))
  56               (should (string= syntax-error (substring code-string
  57                                                        (1- pos) (+ pos len -1))))))
  58         (should (= 0 (length (js2-ast-root-errors ast))))
  59         (ert-with-test-buffer (:name 'copy)
  60           (js2-print-tree ast)
  61           (skip-chars-backward " \t\n")
  62           (should (string= (or reference code-string)
  63                            (buffer-substring-no-properties
  64                             (point-min) (point)))))
  65         (when warnings-count
  66           (should (= warnings-count
  67                      (length (js2-ast-root-warnings ast)))))))))
  68
  69 (cl-defmacro js2-deftest-parse (name code-string &key bind syntax-error errors-count
  70                                      reference warnings-count)
  71   "Parse CODE-STRING.  If SYNTAX-ERROR is nil, print syntax tree
  72 with `js2-print-tree' and assert the result to be equal to
  73 REFERENCE, if present, or the original string.  If SYNTAX-ERROR
  74 is passed, expect syntax error highlighting substring equal to
  75 SYNTAX-ERROR value.  BIND defines bindings to apply them around
  76 the test."
  77   (declare (indent defun))
  78   `(ert-deftest ,(intern (format "js2-%s" name)) ()
  79      (let ,(append bind '((js2-basic-offset 2)))
  80        (js2-test-parse-string ,code-string
  81                               :syntax-error ,syntax-error
  82                               :errors-count ,errors-count
  83                               :warnings-count ,warnings-count
  84                               :reference ,reference))))
  85
  86 ;;; Basics
  87
  88 (js2-deftest-parse variable-assignment
  89   "a = 1;")
  90
  91 (js2-deftest-parse empty-object-literal
  92   "b = {};")
  93
  94 (js2-deftest-parse empty-array-literal
  95   "c = [];")
  96
  97 (js2-deftest-parse array-with-missing-elements
  98   "var a = [1, 2, ,];")
  99
 100 (js2-deftest-parse comma-after-regexp
 101   "d = /eee/, 42;")
 102
 103 (js2-deftest-parse return-statement
 104   "function foo() {\n  return 2;\n}")
 105
 106 (js2-deftest-parse function-statement
 107   "function foo() {\n}")
 108
 109 (js2-deftest-parse function-statement-inside-block
 110   "if (true) {\n  function foo() {\n  }\n}")
 111
 112 (js2-deftest-parse function-expression-statements-are-verboten
 113   "function() {}" :syntax-error "(")
 114
 115 (js2-deftest-parse member-expr-as-function-name
 116   "function a.b.c[2](x, y) {\n}"
 117   :bind ((js2-allow-member-expr-as-function-name t)))
 118
 119 (js2-deftest-parse named-function-expression
 120   "a = function b() {};")
 121
 122 (js2-deftest-parse parenthesized-expression
 123   "(1 + 2);")
 124
 125 (js2-deftest-parse for-with-in-operator-in-parens
 126   "for (var y = (0 in []) in {}) {\n}")
 127
 128 (js2-deftest-parse for-with-in-operator-in-cond
 129   "for (var y = 1 ? 0 in [] : false in {}) {\n}")
 130
 131 (js2-deftest-parse let-expression
 132   "(let (x = 42) x);")
 133
 134 (js2-deftest-parse let-expression-statement
 135   "let (x = 42) x;")
 136
 137 (js2-deftest-parse void
 138   "void 0;")
 139
 140 ;;; Callers of `js2-valid-prop-name-token'
 141
 142 (js2-deftest-parse parse-property-access-when-not-keyword
 143   "A.foo = 3;")
 144
 145 (js2-deftest-parse parse-property-access-when-keyword
 146   "A.in = 3;"
 147   :bind ((js2-allow-keywords-as-property-names t)))
 148
 149 (js2-deftest-parse parse-property-access-when-keyword-no-xml
 150   "A.in = 3;"
 151   :bind ((js2-allow-keywords-as-property-names t)
 152          (js2-compiler-xml-available nil)))
 153
 154 (js2-deftest-parse parse-object-literal-when-not-keyword
 155   "a = {b: 1};")
 156
 157 (js2-deftest-parse parse-object-literal-when-keyword
 158   "a = {in: 1};"
 159   :bind ((js2-allow-keywords-as-property-names t)))
 160
 161 ;;; 'of' contextual keyword
 162
 163 (js2-deftest-parse parse-legacy-array-comp-loop-with-of
 164   "[a for (a of [])];")
 165
 166 (js2-deftest-parse parse-array-comp-loop
 167   "[for (a of []) a];")
 168
 169 (js2-deftest-parse parse-for-of
 170   "for (var a of []) {\n}")
 171
 172 (js2-deftest-parse of-can-be-name
 173   "void of;")
 174
 175 (js2-deftest-parse of-can-be-object-name
 176   "of.z;")
 177
 178 (js2-deftest-parse of-can-be-var-name
 179   "var of = 3;")
 180
 181 (js2-deftest-parse of-can-be-function-name
 182   "function of() {\n}")
 183
 184 ;;; Destructuring binding
 185
 186 (js2-deftest-parse destruct-in-declaration
 187   "var {a, b} = {a: 1, b: 2};"
 188   :warnings-count 0)
 189
 190 (js2-deftest-parse destruct-in-arguments
 191   "function f({a: aa, b: bb}) {\n}")
 192
 193 (js2-deftest-parse destruct-in-array-comp-loop
 194   "[a + b for ([a, b] in [[0, 1], [1, 2]])];")
 195
 196 (js2-deftest-parse destruct-in-catch-clause
 197   "try {\n} catch ({a, b}) {\n  a + b;\n}"
 198   :warnings-count 0)
 199
 200 (js2-deftest-parse destruct-with-initializer-in-object
 201   "var {a, b = 2, c} = {};\nb;"
 202   :warnings-count 0)
 203
 204 (js2-deftest-parse destruct-with-initializer-in-array
 205   "var [a, b = 2, c] = [];\nb;"
 206   :warnings-count 0)
 207
 208 (js2-deftest-parse destruct-non-name-target-is-error
 209   "var {1=1} = {};" :syntax-error "1" :errors-count 1)
 210
 211 (js2-deftest-parse destruct-with-initializer-in-function-params
 212   "function f({a, b = 1, c}, [d, e = 1, f]) {\n}")
 213
 214 (js2-deftest-parse destruct-with-default-in-function-params
 215   "function f({x = 1, y = 2} = {}, [x, y] = [1, 2]) {\n}")
 216
 217 (js2-deftest-parse destruct-name-conflict-is-error-in-object
 218   "\"use strict\";\nvar {a=1,a=2} = {};" :syntax-error "a" :errors-count 1)
 219
 220 (js2-deftest destruct-name-conflict-is-warning-in-array "\"use strict\";\nvar [a=1,a=2] = [];"
 221   (js2-mode--and-parse)
 222   (should (equal '("msg.var.redecl" "a")
 223                  (caar js2-parsed-warnings))))
 224
 225 (js2-deftest initializer-outside-destruct-is-error "({a=1});"
 226   (js2-mode--and-parse)
 227   (should (equal "msg.init.no.destruct"
 228                  (car (caar js2-parsed-errors)))))
 229
 230 ;;; Object literals
 231
 232 (js2-deftest-parse object-literal-shorthand
 233   "var x = {a: 1, b, c: 1, d};")
 234
 235 (js2-deftest-parse object-literal-shorthard-with-number
 236   "var a = {1};" :syntax-error "}" :errors-count 2)
 237
 238 (js2-deftest-parse object-literal-method
 239   "var x = {f(y) {  return y;\n}};")
 240
 241 (js2-deftest object-literal-method-own-name-in-scope "({f(){f();}});"
 242   (js2-mode--and-parse)
 243   (should (equal '("msg.undeclared.variable" "f")
 244                  (caar js2-parsed-warnings))))
 245
 246 (js2-deftest-parse object-literal-getter-method
 247   "var x = {get f() {  return 42;\n}};")
 248
 249 (js2-deftest-parse object-literal-setter-method
 250   "var x = {set f(y) {  x = y;\n}};")
 251
 252 (js2-deftest-parse object-literal-computed-keys
 253   "var x = {[Symbol.iterator]: function() {}};")
 254
 255 (js2-deftest-parse object-literal-computed-function-keys
 256   "var x = {[foo + bar](y) {  return y;\n}};")
 257
 258 (js2-deftest-parse object-literal-computed-getter-key
 259   "var x = {get [foo + bar]() {  return 42;\n}};")
 260
 261 (js2-deftest-parse object-literal-generator
 262   "var x = {*foo() {  yield 42;\n}};")
 263
 264 (js2-deftest-parse object-literal-computed-generator-key
 265   "var x = {*[foo + bar]() {  yield 42;\n}};")
 266
 267 ;;; Function definition
 268
 269 (js2-deftest function-redeclaring-var "var gen = 3; function gen() {};"
 270   (js2-mode--and-parse)
 271   (should (= (length (js2-ast-root-warnings js2-mode-ast)) 1)))
 272
 273 (js2-deftest function-expression-var-same-name "var gen = function gen() {};"
 274   (js2-mode--and-parse)
 275   (should (null (js2-ast-root-warnings js2-mode-ast))))
 276
 277 ;;; Function parameters
 278
 279 (js2-deftest-parse function-with-default-parameters
 280   "function foo(a = 1, b = a + 1) {\n}")
 281
 282 (js2-deftest-parse function-with-no-default-after-default
 283   "function foo(a = 1, b) {\n}")
 284
 285 (js2-deftest-parse function-with-destruct-after-default
 286   "function foo(a = 1, {b, c}) {\n}")
 287
 288 (js2-deftest-parse function-with-rest-parameter
 289   "function foo(a, b, ...rest) {\n}")
 290
 291 (js2-deftest-parse function-with-param-after-rest-parameter
 292   "function foo(a, ...b, rest) {\n}"
 293   :syntax-error "rest")
 294
 295 (js2-deftest-parse function-with-destruct-after-rest-parameter
 296   "function foo(a, ...b, {}) {\n}"
 297   :syntax-error "{}")
 298
 299 (js2-deftest-parse function-with-rest-after-default-parameter
 300   "function foo(a = 1, ...rest) {\n}")
 301
 302 ;;; Strict mode errors
 303
 304 (js2-deftest-parse function-bad-strict-parameters
 305   "'use strict';\nfunction foo(eval, {arguments}, bar) {\n}"
 306   :syntax-error "eval" :errors-count 2)
 307
 308 (js2-deftest-parse function-retroactive-bad-strict-parameters
 309   "function foo(arguments) {'use strict';}"
 310   :syntax-error "arguments" :errors-count 1)
 311
 312 (js2-deftest-parse function-duplicate-strict-parameters
 313   "'use strict';\nfunction foo(a, a) {\n}"
 314   :syntax-error "a" :errors-count 1)
 315
 316 (js2-deftest-parse function-bad-strict-function-name
 317   "'use strict';\nfunction eval() {\n}"
 318   :syntax-error "eval" :errors-count 1)
 319
 320 (js2-deftest-parse function-bad-retroactive-strict-function-name
 321   "function arguments() {'use strict';}"
 322   :syntax-error "arguments" :errors-count 1)
 323
 324 (js2-deftest-parse function-bad-strict-catch-name
 325   "'use strict';\ntry {} catch (eval) {}"
 326   :syntax-error "eval" :errors-count 1)
 327
 328 (js2-deftest-parse function-bad-strict-variable-name
 329   "'use strict';\nvar eval = 'kekeke';"
 330   :syntax-error "eval" :errors-count 1)
 331
 332 (js2-deftest-parse function-bad-strict-assignment
 333   "'use strict';\narguments = 'fufufu';"
 334   :syntax-error "arguments" :errors-count 1)
 335
 336 (js2-deftest-parse function-property-strict-assignment
 337   "'use strict';\narguments.okay = 'alright';")
 338
 339 (js2-deftest-parse function-strict-with
 340   "'use strict';\nwith ({}) {}"
 341   :syntax-error "with" :errors-count 1)
 342
 343 (js2-deftest-parse function-strict-octal
 344   "'use strict';\nvar number = 0644;"
 345   :syntax-error "0644" :errors-count 1)
 346
 347 (js2-deftest-parse function-strict-octal-allow-0o
 348   "'use strict';\n0o644;" :reference "'use strict';\n420;")
 349
 350 (js2-deftest-parse function-strict-duplicate-keys
 351   "'use strict';\nvar object = {a: 1, a: 2, 'a': 3, ['a']: 4, 1: 5, '1': 6, [1 + 1]: 7};"
 352   :syntax-error "a" :errors-count 4) ; "a" has 3 dupes, "1" has 1 dupe.
 353
 354 (js2-deftest-parse function-strict-duplicate-getter
 355   "'use strict';\nvar a = {get x() {}, get x() {}};"
 356   :syntax-error "x" :errors-count 1)
 357
 358 (js2-deftest-parse function-strict-duplicate-setter
 359   "'use strict';\nvar a = {set x() {}, set x() {}};"
 360   :syntax-error "x" :errors-count 1)
 361
 362 ;;; Lack of errors in strict mode
 363
 364 (js2-deftest-parse function-strict-const-scope
 365   "'use strict';\nconst a;\nif (1) {\n  const a;\n}")
 366
 367 (js2-deftest-parse function-strict-no-getter-setter-duplicate
 368   "'use strict';\nvar a = {get x() {}, set x() {}};")
 369
 370 ;;; Spread operator
 371
 372 (js2-deftest-parse spread-in-array-literal
 373   "[1, ...[2, 3], 4, ...[5, 6]];")
 374
 375 (js2-deftest-parse spread-in-function-call
 376   "f(3, ...[t(2), t(3)], 42, ...[t(4)]);")
 377
 378 (js2-deftest-parse rest-in-array-destructure
 379   "let [x, y, z, ...w] = [1, ...a, ...b, c];")
 380
 381 (js2-deftest-parse comma-after-rest-in-array
 382   "let [...x,] = [1, 2, 3];"
 383   :syntax-error "," :errors-count 1)
 384
 385 (js2-deftest-parse elem-after-rest-in-array
 386   "let [...x, y] = [1, 2, 3];"
 387   :syntax-error "," :errors-count 2)
 388
 389 (js2-deftest-parse array-destructure-expr-default
 390   "let [[x] = [3]] = y;")
 391
 392 ;;; Arrow functions
 393
 394 (js2-deftest-parse arrow-function-with-empty-args-and-no-curlies
 395   "() => false;" :reference "() => {false};")
 396
 397 (js2-deftest-parse arrow-function-with-args-and-curlies
 398   "(a, b = 1, ...c) => {  c;\n};")
 399
 400 (js2-deftest-parse arrow-function-with-destructuring
 401   "([{a}, b]) => {  a + b;\n};")
 402
 403 (js2-deftest-parse parenless-arrow-function-prohibits-rest
 404   "...b => {b + 1;};" :syntax-error "=>")
 405
 406 (js2-deftest-parse parenless-arrow-function-prohibits-destructuring
 407   "[a, b] => {a + b;};" :syntax-error "]" :errors-count 4)
 408
 409 (js2-deftest-parse arrow-function-recovers-from-error
 410   "[(,foo) => 1];" :syntax-error "," :errors-count 6)
 411
 412 ;;; Automatic semicolon insertion
 413
 414 (js2-deftest-parse no-auto-semi-insertion-after-if
 415   "if (true) {\n}")
 416
 417 (js2-deftest-parse auto-semi-insertion-after-function
 418   "a = function() {}" :reference "a = function() {};")
 419
 420 (js2-deftest-parse auto-semi-one-variable-per-line
 421   "x\ny" :reference "x;\ny;")
 422
 423 ;;; Labels
 424
 425 (js2-deftest-parse labeled-stmt-node
 426   "foo:\nbar:\nx = y + 1;")
 427
 428 (js2-deftest no-label-node-inside-expr "x = y:"
 429   (let (js2-parse-interruptable-p)
 430     (js2-mode--and-parse))
 431   (let ((assignment (js2-expr-stmt-node-expr (car (js2-scope-kids js2-mode-ast)))))
 432     (should (js2-name-node-p (js2-assign-node-right assignment)))))
 433
 434 (js2-deftest-parse label-and-loops "for (; ; ) {
 435   loop:
 436   for (; ; ) {
 437     continue loop;
 438   }
 439 }")
 440
 441 ;;; Generators
 442
 443 (js2-deftest-parse legacy-generator "function foo() {\n  yield 1;\n}")
 444
 445 (js2-deftest-parse legacy-generator-cannot-return
 446   "function foo() {\n  yield 1;\n return 2;\n}" :syntax-error "return 2")
 447
 448 (js2-deftest-parse harmony-generator "function* bar() {\n  yield 2;\n  return 3;\n}")
 449
 450 (js2-deftest-parse harmony-generator-yield-star "(function*(a) {  yield* a;\n});")
 451
 452 ;;; Comprehensions
 453
 454 (js2-deftest-parse parse-legacy-array-comp-loop-with-filter
 455   "[a for (a in b) if (a == 2)];")
 456
 457 (js2-deftest-parse parse-array-comp-loop-with-filters
 458   "[for (a in b) if (a == 2) if (b != 10) a];")
 459
 460 (js2-deftest-parse parse-generator-comp-loop-with-filters
 461   "(for (x of y) if (x != 4) x);")
 462
 463 (js2-deftest-parse parse-array-comp-with-yield-is-ok
 464   "(function() {  return [for (x of []) yield x];\n});")
 465
 466 (js2-deftest-parse parse-generator-comp-with-yield-is-not-ok
 467   "(function() {  return (for (x of []) yield x);\n});"
 468   :syntax-error "yield")
 469
 470 (js2-deftest-parse parse-generator-comp-with-yield-inside-function-is-ok
 471   "(for (x of []) function*() {  yield x;\n});")
 472
 473 ;;; Async
 474
 475 (js2-deftest-parse async-function-statement
 476   "async function foo() {\n}")
 477
 478 (js2-deftest-parse async-function-statement-inside-block
 479   "if (true) {\n  async function foo() {\n  }\n}")
 480
 481 (js2-deftest-parse async-function-expression-statements-are-verboten
 482   "async function() {}" :syntax-error "(")
 483
 484 (js2-deftest-parse async-named-function-expression
 485   "a = async function b() {};")
 486
 487 (js2-deftest-parse async-arrow-function-expression
 488   "a = async (b) => {  b;\n};")
 489
 490 (js2-deftest-parse async-method-in-object-literal
 491   "({async f() {}});")
 492
 493 (js2-deftest-parse async-method-in-class-body
 494   "class C {\n  async foo() {}\n}")
 495
 496 (js2-deftest-parse static-async-method-in-class-body
 497   "class C {\n  static async foo() {}\n}")
 498
 499 (js2-deftest-parse async-method-allow-await
 500   "({async f() {  await x;\n}});")
 501
 502 ;;; Await
 503
 504 (js2-deftest-parse await-is-ok "async function foo() {\n  await bar();\n}")
 505
 506 (js2-deftest-parse await-inside-assignment-is-ok
 507                    "async function foo() {\n  var result = await bar();\n}")
 508
 509 (js2-deftest-parse await-inside-array-is-ok
 510                    "async function foo() {\n  var results = [await bar(), await baz()];\n}")
 511
 512 (js2-deftest-parse await-inside-non-async-function-is-not-ok
 513                    "function foo() {\n  await bar();\n}"
 514                    :syntax-error "await")
 515
 516 (js2-deftest-parse await-inside-non-async-arrow-function-is-not-ok
 517                    "a = () => {  await bar();\n}"
 518                    :syntax-error "await")
 519
 520 ;;; 'async' and 'await' are contextual keywords
 521
 522 (js2-deftest-parse async-can-be-name
 523   "void async;")
 524
 525 (js2-deftest-parse async-can-be-object-name
 526   "async.z;")
 527
 528 (js2-deftest-parse async-can-be-var-name
 529   "var async = 3;")
 530
 531 (js2-deftest-parse async-can-be-function-name
 532   "function async() {\n}")
 533
 534 (js2-deftest-parse await-can-be-name
 535   "void await;")
 536
 537 (js2-deftest-parse await-can-be-object-name
 538   "await.z;")
 539
 540 (js2-deftest-parse await-can-be-var-name
 541   "var await = 3;")
 542
 543 (js2-deftest-parse await-can-be-function-name
 544   "function await() {\n}")
 545
 546 ;;; Numbers
 547
 548 (js2-deftest-parse decimal-starting-with-zero "081;" :reference "81;")
 549
 550 (js2-deftest-parse huge-hex "0x0123456789abcdefABCDEF;" :reference "-1;")
 551
 552 (js2-deftest-parse octal-without-o "071;" :reference "57;")
 553
 554 (js2-deftest-parse hex-number-okay "0x123;" :reference "291;")
 555
 556 (js2-deftest-parse hex-number-broken "0xz23;"
 557   :syntax-error "0xz" :errors-count 2)
 558
 559 (js2-deftest-parse binary-number-okay "0b101;" :reference "5;")
 560
 561 (js2-deftest-parse binary-number-broken "0b210;"
 562   :syntax-error "0b2" :errors-count 2)
 563
 564 (js2-deftest-parse octal-number-okay "0o765;" :reference "501;")
 565
 566 (js2-deftest-parse octal-number-broken "0o812;"
 567   :syntax-error "0o8" :errors-count 2)
 568
 569 ;;; Modules
 570
 571 (js2-deftest parse-export-bindings "{one, two as dos}"
 572   (js2-init-scanner)
 573   (should (js2-match-token js2-LC))
 574   (let ((imports (js2-parse-export-bindings)))
 575     (should (not (equal nil imports)))
 576     (should (= 2 (length imports)))
 577     (let ((first (nth 0 imports))
 578           (second (nth 1 imports)))
 579       (should (equal "one" (js2-name-node-name (js2-export-binding-node-extern-name first))))
 580       (should (equal "two" (js2-name-node-name (js2-export-binding-node-extern-name second))))
 581       (let ((first-name (js2-export-binding-node-local-name first))
 582             (second-name (js2-export-binding-node-local-name second)))
 583         (should (equal first (js2-node-parent first-name)))
 584         (should (equal 3 (js2-node-len first-name)))
 585         (should (equal "one" (js2-name-node-name first-name)))
 586         (should (equal second (js2-node-parent second-name)))
 587         (should (equal 3 (js2-node-len second-name)))
 588         (should (equal "dos" (js2-name-node-name second-name)))))))
 589
 590 (js2-deftest parse-export-binding-as-default "one as default"
 591   (js2-init-scanner)
 592   (let ((binding (js2-maybe-parse-export-binding)))
 593     (should binding)
 594     (should (js2-export-binding-node-p binding))
 595     (let ((name (js2-export-binding-node-local-name binding)))
 596       (should name)
 597       (should (equal "default" (js2-name-node-name name))))))
 598
 599 (js2-deftest parse-namepsace-import "* as lib;"
 600   (js2-init-scanner)
 601   (should (js2-match-token js2-MUL))
 602   (let ((namespace-import (js2-parse-namespace-import)))
 603     (should (not (equal nil namespace-import)))
 604     (should (js2-namespace-import-node-p namespace-import))
 605     (should (= 1 (js2-node-pos namespace-import)))
 606     (should (equal 8 (js2-node-len namespace-import)))
 607     (let ((name-node (js2-namespace-import-node-name namespace-import)))
 608       (should (equal "lib" (js2-name-node-name name-node)))
 609       (should (= 5 (js2-node-pos name-node))))))
 610
 611 (js2-deftest parse-from-clause "from 'foo/bar';"
 612   (js2-init-scanner)
 613   (let ((from (js2-parse-from-clause)))
 614     (should (not (equal nil from)))
 615     (should (= 1 (js2-node-pos from)))
 616     (should (= 14 (js2-node-len from)))
 617     (should (equal "foo/bar" (js2-from-clause-node-module-id from)))))
 618
 619 (js2-deftest parse-import-module-id-only "import 'src/lib'"
 620   (js2-init-scanner)
 621   (should (js2-match-token js2-IMPORT))
 622   (let ((import (js2-parse-import)))
 623     (should (not (equal nil import)))
 624     (should (= 1 (js2-node-pos import)))
 625     (should (= 16 (js2-node-len import)))
 626     (should (equal nil (js2-import-node-import import)))
 627     (should (equal nil (js2-import-node-from import)))))
 628
 629 (js2-deftest parse-imported-default-binding "import theDefault from 'src/lib'"
 630   (js2-push-scope (make-js2-scope :pos 0))
 631   (js2-init-scanner)
 632   (should (js2-match-token js2-IMPORT))
 633   (let ((import-node (js2-parse-import)))
 634     (should (not (equal nil import-node)))
 635     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 636     (let ((import (js2-import-node-import import-node)))
 637       (should (not (equal nil import)))
 638       (should (equal nil (js2-import-clause-node-namespace-import import)))
 639       (should (equal nil (js2-import-clause-node-named-imports import)))
 640       (let ((default (js2-import-clause-node-default-binding import)))
 641         (should (not (equal nil default)))
 642         (should (js2-export-binding-node-p default))
 643         (should (equal "theDefault" (js2-name-node-name (js2-export-binding-node-extern-name default)))))))
 644   (should (js2-scope-get-symbol js2-current-scope "theDefault")))
 645
 646 (js2-deftest parse-import-namespace-binding "import * as lib from 'src/lib'"
 647   (js2-push-scope (make-js2-scope :pos 0))
 648   (js2-init-scanner)
 649   (should (js2-match-token js2-IMPORT))
 650   (let ((import-node (js2-parse-import)))
 651     (should (not (equal nil import-node)))
 652     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 653     (let ((import (js2-import-node-import import-node)))
 654       (should (not (equal nil import)))
 655       (should (equal nil (js2-import-clause-node-default-binding import)))
 656       (should (equal nil (js2-import-clause-node-named-imports import)))
 657       (let ((ns-import (js2-import-clause-node-namespace-import import)))
 658         (should (not (equal nil ns-import)))
 659         (should (js2-namespace-import-node-p ns-import))
 660         (should (equal "lib" (js2-name-node-name (js2-namespace-import-node-name ns-import)))))))
 661   (should (js2-scope-get-symbol js2-current-scope "lib")))
 662
 663 (js2-deftest parse-import-named-imports "import {foo as bar, baz} from 'src/lib'"
 664   (js2-push-scope (make-js2-scope :pos 0))
 665   (js2-init-scanner)
 666   (should (js2-match-token js2-IMPORT))
 667   (let ((import-node (js2-parse-import)))
 668     (should (not (equal nil import-node)))
 669     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 670     (let ((import (js2-import-node-import import-node)))
 671       (should (not (equal nil import)))
 672       (should (equal nil (js2-import-clause-node-default-binding import)))
 673       (should (equal nil (js2-import-clause-node-namespace-import import)))
 674       (let ((named-imports (js2-import-clause-node-named-imports import)))
 675         (should (not (equal nil named-imports)))
 676         (should (listp named-imports))
 677         (should (= 2 (length named-imports)))
 678         (let ((first (nth 0 named-imports))
 679               (second (nth 1 named-imports)))
 680           (should (equal "bar" (js2-name-node-name (js2-export-binding-node-local-name first))))
 681           (should (equal "baz" (js2-name-node-name (js2-export-binding-node-local-name second))))))))
 682   (should (js2-scope-get-symbol js2-current-scope "bar"))
 683   (should (js2-scope-get-symbol js2-current-scope "baz")))
 684
 685 (js2-deftest parse-import-default-and-namespace "import stuff, * as lib from 'src/lib'"
 686   (js2-push-scope (make-js2-scope :pos 0))
 687   (js2-init-scanner)
 688   (should (js2-match-token js2-IMPORT))
 689   (let ((import-node (js2-parse-import)))
 690     (should (not (equal nil import-node)))
 691     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 692     (let ((import (js2-import-node-import import-node)))
 693       (should (not (equal nil import)))
 694       (should (equal nil (js2-import-clause-node-named-imports import)))
 695       (let ((default (js2-import-clause-node-default-binding import))
 696             (ns-import (js2-import-clause-node-namespace-import import)))
 697         (should (not (equal nil default)))
 698         (should (equal "stuff" (js2-name-node-name (js2-export-binding-node-local-name default))))
 699         (should (not (equal nil ns-import)))
 700         (should (js2-namespace-import-node-p ns-import))
 701         (should (equal "lib" (js2-name-node-name (js2-namespace-import-node-name ns-import)))))))
 702   (should (js2-scope-get-symbol js2-current-scope "stuff"))
 703   (should (js2-scope-get-symbol js2-current-scope "lib")))
 704
 705 (js2-deftest parse-import-default-and-named-imports
 706   "import robert as bob, {cookies, pi as PIE} from 'src/lib'"
 707   (js2-push-scope (make-js2-scope :pos 0))
 708   (js2-init-scanner)
 709   (should (js2-match-token js2-IMPORT))
 710   (let ((import-node (js2-parse-import)))
 711     (should (not (equal nil import-node)))
 712     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 713     (let ((import (js2-import-node-import import-node)))
 714       (should (not (equal nil import)))
 715       (should (not (equal nil (js2-import-clause-node-named-imports import))))
 716       (let ((default (js2-import-clause-node-default-binding import))
 717             (named-imports (js2-import-clause-node-named-imports import)))
 718         (should (not (equal nil default)))
 719         (should (equal "bob" (js2-name-node-name (js2-export-binding-node-local-name default))))
 720         (should (not (equal nil named-imports)))
 721         (should (= 2 (length named-imports))))))
 722   (should (js2-scope-get-symbol js2-current-scope "bob"))
 723   (should (js2-scope-get-symbol js2-current-scope "cookies"))
 724   (should (js2-scope-get-symbol js2-current-scope "PIE")))
 725
 726 (js2-deftest parse-this-module-in-from-clause "import {url} from this module;"
 727   (js2-push-scope (make-js2-scope :pos 0))
 728   (js2-init-scanner)
 729   (should (js2-match-token js2-IMPORT))
 730   (let ((import-node (js2-parse-import)))
 731     (should import-node)
 732     (let ((from-clause (js2-import-node-from import-node)))
 733       (should from-clause)
 734       (should (equal "this" (js2-from-clause-node-module-id from-clause)))
 735       (should (js2-from-clause-node-metadata-p from-clause)))))
 736
 737 (js2-deftest-parse import-only-for-side-effects "import 'src/lib';")
 738 (js2-deftest-parse import-default-only "import theDefault from 'src/lib';")
 739 (js2-deftest-parse import-named-only "import {one, two} from 'src/lib';")
 740 (js2-deftest-parse import-default-and-named "import theDefault, {one, two} from 'src/lib';")
 741 (js2-deftest-parse import-renaming-default "import * as lib from 'src/mylib';")
 742 (js2-deftest-parse import-renaming-named "import {one as uno, two as dos} from 'src/lib';")
 743 (js2-deftest-parse import-default-and-namespace "import robert as bob, * as lib from 'src/lib';")
 744 (js2-deftest-parse import-from-this-module "import {url} from this module;")
 745
 746 ;; Module Exports
 747
 748 (js2-deftest export-rexport "export * from 'other/lib'"
 749   (js2-init-scanner)
 750   (should (js2-match-token js2-EXPORT))
 751   (let ((export-node (js2-parse-export)))
 752     (should export-node)
 753     (should (js2-export-node-from-clause export-node))))
 754
 755 (js2-deftest export-export-named-list "export {foo, bar as bang};"
 756   (js2-init-scanner)
 757   (should (js2-match-token js2-EXPORT))
 758   (let ((export-node (js2-parse-export)))
 759     (should export-node)
 760     (let ((exports (js2-export-node-exports-list export-node)))
 761       (should exports)
 762       (should (= 2 (length exports))))))
 763
 764 (js2-deftest re-export-named-list "export {foo, bar as bang} from 'other/lib'"
 765   (js2-init-scanner)
 766   (should (js2-match-token js2-EXPORT))
 767   (let ((export-node (js2-parse-export)))
 768     (should export-node)
 769     (should (js2-export-node-from-clause export-node))
 770     (let ((exports (js2-export-node-exports-list export-node)))
 771       (should exports)
 772       (should (= 2 (length exports))))))
 773
 774 (js2-deftest export-variable-statement "export var foo = 'bar', baz = 'bang';"
 775   (js2-init-scanner)
 776   (js2-push-scope (make-js2-scope :pos 0))
 777   (should (js2-match-token js2-EXPORT))
 778   (let ((export-node (js2-parse-export)))
 779     (should export-node)
 780     (should (js2-export-node-declaration export-node))))
 781
 782 (js2-deftest export-const-declaration "export const PI = Math.PI;"
 783   (js2-init-scanner)
 784   (js2-push-scope (make-js2-scope :pos 0))
 785   (should (js2-match-token js2-EXPORT))
 786   (let ((export-node (js2-parse-export)))
 787     (should export-node)
 788     (should (js2-export-node-declaration export-node))))
 789
 790 (js2-deftest export-let-declaration "export let foo = [1];"
 791   (js2-init-scanner)
 792   (js2-push-scope (make-js2-scope :pos 0))
 793   (should (js2-match-token js2-EXPORT))
 794   (let ((export-node (js2-parse-export)))
 795     (should export-node)
 796     (should (js2-var-decl-node-p (js2-export-node-declaration export-node)))))
 797
 798 (js2-deftest export-class-declaration "export class Foo {}"
 799   (js2-init-scanner)
 800   (js2-push-scope (make-js2-scope :pos 0))
 801   (should (js2-match-token js2-EXPORT))
 802   (let ((export-node (js2-parse-export)))
 803     (should export-node)
 804     (should (js2-class-node-p (js2-export-node-declaration export-node)))))
 805
 806 (js2-deftest export-function-declaration "export default function doStuff() {}"
 807   (js2-init-scanner)
 808   (js2-push-scope (make-js2-scope :pos 0))
 809   (should (js2-match-token js2-EXPORT))
 810   (let ((export-node (js2-parse-export)))
 811     (should export-node)
 812     (should (js2-export-node-default export-node))))
 813
 814 (js2-deftest export-generator-declaration "export default function* one() {}"
 815   (js2-init-scanner)
 816   (js2-push-scope (make-js2-scope :pos 0))
 817   (should (js2-match-token js2-EXPORT))
 818   (let ((export-node (js2-parse-export)))
 819     (should export-node)
 820     (should (js2-export-node-default export-node))))
 821
 822 (js2-deftest export-assignment-expression "export default a = b;"
 823   (js2-init-scanner)
 824   (js2-push-scope (make-js2-scope :pos 0))
 825   (should (js2-match-token js2-EXPORT))
 826   (let ((export-node (js2-parse-export)))
 827     (should export-node)
 828     (should (js2-export-node-default export-node))))
 829
 830 (js2-deftest export-function-no-semicolon "export default function foo() {}"
 831   (js2-mode--and-parse)
 832   (should (equal nil js2-parsed-warnings)))
 833 (js2-deftest export-default-function-no-semicolon "export function foo() {}"
 834   (js2-mode--and-parse)
 835   (should (equal nil js2-parsed-warnings)))
 836 (js2-deftest export-anything-else-does-require-a-semicolon "export var obj = {}"
 837   (js2-mode--and-parse)
 838   (should (not (equal nil js2-parsed-warnings))))
 839
 840 (js2-deftest export-default-async-function-no-semicolon "export default async function foo() {}"
 841   (js2-mode--and-parse)
 842   (should (equal nil js2-parsed-warnings)))
 843 (js2-deftest export-async-function-no-semicolon "export async function foo() {}"
 844   (js2-mode--and-parse)
 845   (should (equal nil js2-parsed-warnings)))
 846
 847 (js2-deftest-parse parse-export-rexport "export * from 'other/lib';")
 848 (js2-deftest-parse parse-export-export-named-list "export {foo, bar as bang};")
 849 (js2-deftest-parse parse-re-export-named-list "export {foo, bar as bang} from 'other/lib';")
 850 (js2-deftest-parse parse-export-const-declaration "export const PI = Math.PI;")
 851 (js2-deftest-parse parse-export-let-declaration "export let foo = [1];")
 852 (js2-deftest-parse parse-export-function-declaration "export default function doStuff() {\n}")
 853 (js2-deftest-parse parse-export-generator-declaration "export default function* one() {\n}")
 854 (js2-deftest-parse parse-export-assignment-expression "export default a = b;")
 855
 856 (js2-deftest-parse parse-export-function-declaration-no-semi
 857   "export function f() {\n}")
 858
 859 (js2-deftest-parse parse-export-class-declaration-no-semi
 860   "export class C {\n}")
 861
 862 (js2-deftest-parse parse-export-async-function-allow-await
 863   "export async function f() {\n  await f();\n}")
 864
 865 (js2-deftest-parse parse-export-default-async-function-allow-await
 866   "export default async function f() {\n  await f();\n}")
 867
 868 ;;; Strings
 869
 870 (js2-deftest-parse string-literal
 871   "var x = 'y';")
 872
 873 (js2-deftest-parse object-get-string-literal
 874   "var x = {y: 5};\nvar z = x[\"y\"];")
 875
 876 (js2-deftest-parse template-no-substritutions
 877   "var x = `abc
 878             def`, y = `\\u0000`;")
 879
 880 (js2-deftest-parse template-with-substitutions
 881   "var y = `${a + b} ${d + e + f}`;")
 882
 883 (js2-deftest-parse tagged-template
 884   "foo.args`${++x, \"o\"}k`;")
 885
 886 ;;; Classes
 887
 888 (js2-deftest-parse parse-harmony-class-statement
 889   "class Foo {\n  get bar() {  return 42;\n}\n  set bar(x) {  y = x;\n}\n}")
 890
 891 (js2-deftest-parse parse-harmony-class-statement-without-name-is-not-ok
 892   "class {\n  get bar() {  return 42;\n}\n}"
 893   :syntax-error "{")
 894
 895 (js2-deftest-parse parse-harmony-class-expression
 896   "var Foo1 = class Foo {\n  bar() {  return 42;\n}\n};")
 897
 898 (js2-deftest-parse parse-harmony-anonymous-class-expression
 899   "var Foo = class {\n  set bar(x) {  bar = x;\n}\n};")
 900
 901 (js2-deftest-parse parse-harmony-class-with-extends
 902   "class Foo extends Bar {\n}")
 903
 904 (js2-deftest-parse parse-harmony-anonymous-class-with-extends
 905   "foo.Foo = class extends Bar {\n  set bar(x) {  bar = x;\n}\n};")
 906
 907 (js2-deftest-parse parse-harmony-class-with-complex-extends
 908   "class Foo extends foo[BAR][2].Baz {\n}")
 909
 910 (js2-deftest-parse parse-harmony-class-missing-extended-class-is-not-ok
 911   "class Foo extends {\n}"
 912   :syntax-error "extends")
 913
 914 (js2-deftest-parse parse-harmony-class-static-method
 915   "class Foo extends Bar {\n  static bar() {  return 42;\n}\n}")
 916
 917 (js2-deftest-parse parse-unterminated-class-is-not-okay
 918   "class Foo {\n  get bar() {  return 42;\n}"
 919   :syntax-error "}")
 920
 921 (js2-deftest-parse parse-super-keyword
 922   "class Foo {\n  constructor() {  super(42);\n}\n  foo() {  super.foo();\n}\n}")
 923
 924 (js2-deftest-parse parse-class-keywordlike-method
 925   "class C {\n  delete() {}\n  if() {}\n}")
 926
 927 (js2-deftest-parse parse-harmony-class-allow-semicolon-element
 928   "class Foo {;}" :reference "class Foo {\n}")
 929
 930 ;;; Scopes
 931
 932 (js2-deftest ast-symbol-table-includes-fn-node "function foo() {}"
 933   (js2-mode--and-parse)
 934   (let ((entry (js2-scope-get-symbol js2-mode-ast 'foo)))
 935     (should (= (js2-symbol-decl-type entry) js2-FUNCTION))
 936     (should (equal (js2-symbol-name entry) "foo"))
 937     (should (js2-function-node-p (js2-symbol-ast-node entry)))))
 938
 939 (js2-deftest fn-symbol-table-includes-nested-fn "function foo() {
 940   function bar() {}
 941   var x;
 942 }"
 943   (js2-mode--and-parse)
 944   (let* ((scope (js2-node-at-point (point-min)))
 945          (fn-entry (js2-scope-get-symbol scope 'bar))
 946          (var-entry (js2-scope-get-symbol scope 'x)))
 947     (should (string= (js2-name-node-name (js2-function-node-name scope)) "foo"))
 948     (should (= (js2-symbol-decl-type fn-entry) js2-FUNCTION))
 949     (should (js2-function-node-p (js2-symbol-ast-node fn-entry)))
 950     (should (= (js2-symbol-decl-type var-entry) js2-VAR))
 951     (should (js2-name-node-p (js2-symbol-ast-node var-entry)))))
 952
 953 (defun js2-test-scope-of-nth-variable-satisifies-predicate (variable nth predicate)
 954   (goto-char (point-min))
 955   (dotimes (n (1+ nth)) (search-forward variable))
 956   (forward-char -1)
 957   (let ((scope (js2-node-get-enclosing-scope (js2-node-at-point))))
 958     (should (funcall predicate (js2-get-defining-scope scope variable)))))
 959
 960 (js2-deftest for-node-is-declaration-scope "for (let i = 0; i; ++i) {};"
 961   (js2-mode--and-parse)
 962   (js2-test-scope-of-nth-variable-satisifies-predicate "i" 0 #'js2-for-node-p))
 963
 964 (js2-deftest const-scope-sloppy-script "{const a;} a;"
 965   (js2-mode--and-parse)
 966   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 0 #'js2-script-node-p)
 967   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 1 #'js2-script-node-p))
 968
 969 (js2-deftest const-scope-strict-script "'use strict'; { const a; } a;"
 970   (js2-mode--and-parse)
 971   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 0 #'js2-block-node-p)
 972   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 1 #'null))
 973
 974 (js2-deftest const-scope-sloppy-function "function f() { { const a; } a; }"
 975   (js2-mode--and-parse)
 976   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 0 #'js2-function-node-p)
 977   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 1 #'js2-function-node-p))
 978
 979 (js2-deftest const-scope-strict-function "function f() { 'use strict'; { const a; } a; }"
 980   (js2-mode--and-parse)
 981   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 0 #'js2-block-node-p)
 982   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 1 #'null))
 983
 984 (js2-deftest array-comp-is-result-scope "[x * 2 for (x in y)];"
 985   (js2-mode--and-parse)
 986   (js2-test-scope-of-nth-variable-satisifies-predicate "x" 0 #'js2-comp-loop-node-p))
 987
 988 (js2-deftest array-comp-has-parent-scope
 989              "var a,b=[for (i of [[1,2]]) for (j of i) j * a];"
 990   (js2-mode--and-parse)
 991   (search-forward "for")
 992   (forward-char -3)
 993   (let ((node (js2-node-at-point)))
 994     (should (js2-scope-parent-scope node))
 995     (should (js2-get-defining-scope node "j"))))
 996
 997 ;;; Tokenizer
 998
 999 (js2-deftest get-token "(1+1)"
1000   (js2-init-scanner)
1001   (should (eq js2-LP (js2-next-token)))
1002   (should (eq js2-NUMBER (js2-next-token)))
1003   (should (eq js2-ADD (js2-next-token)))
1004   (should (eq js2-NUMBER (js2-next-token)))
1005   (should (eq js2-RP (js2-next-token))))
1006
1007 (js2-deftest unget-token "()"
1008   (js2-init-scanner)
1009   (should (eq js2-LP (js2-next-token)))
1010   (js2-unget-token)
1011   (should (eq js2-LP (js2-next-token)))
1012   (should (eq js2-RP (js2-next-token))))
1013
1014 (js2-deftest get-token-or-eol "x\n++;"
1015   (js2-init-scanner)
1016   (should (eq js2-NAME (js2-next-token)))
1017   (should (eq js2-EOL (js2-peek-token-or-eol)))
1018   (should (eq js2-INC (js2-next-token)))
1019   (should (eq js2-SEMI (js2-peek-token-or-eol))))
1020
1021 (js2-deftest unget-token-over-eol-and-comment "x\n//abc\ny"
1022   (js2-init-scanner)
1023   (should (eq js2-NAME (js2-next-token)))
1024   (should (eq js2-NAME (js2-next-token)))
1025   (should (equal "y" (js2-current-token-string)))
1026   (js2-unget-token)
1027   (should (eq js2-NAME (js2-current-token-type)))
1028   (should (equal "x" (js2-current-token-string))))
1029
1030 (js2-deftest ts-seek "(1+2)"
1031   (js2-init-scanner)
1032   (should (eq js2-LP (js2-next-token)))
1033   (should (eq js2-NUMBER (js2-next-token)))
1034   (js2-unget-token)
1035   (let ((state (make-js2-ts-state)))
1036     (should (eq js2-NUMBER (js2-next-token)))
1037     (should (eq js2-ADD (js2-next-token)))
1038     (js2-ts-seek state)
1039     (should (eq 1 js2-ti-lookahead))
1040     (should (eq js2-NUMBER (js2-next-token)))
1041     (should (eq 1 (js2-token-number
1042                    (js2-current-token))))))
1043
1044 (js2-deftest get-token-template-literal "`abc ${i} z ${j} def`"
1045   (js2-init-scanner)
1046   (should (eq js2-TEMPLATE_HEAD (js2-next-token)))
1047   (should (equal "abc " (js2-current-token-string)))
1048   (should (eq js2-NAME (js2-next-token)))
1049   (should (eq js2-RC (js2-next-token)))
1050   (should (eq js2-TEMPLATE_HEAD (js2-next-token 'TEMPLATE_TAIL)))
1051   (should (equal " z " (js2-current-token-string)))
1052   (should (eq js2-NAME (js2-next-token)))
1053   (should (eq js2-RC (js2-next-token)))
1054   (should (eq js2-NO_SUBS_TEMPLATE (js2-next-token 'TEMPLATE_TAIL)))
1055   (should (equal " def" (js2-current-token-string))))
1056
1057 ;;; Error handling
1058
1059 (js2-deftest for-node-with-error-len "for "
1060   (js2-mode--and-parse)
1061   (let ((node (js2-node-at-point (point-min))))
1062     (should (= (js2-node-len (js2-node-parent node)) 4))))
1063
1064 (js2-deftest function-without-parens-error "function b {}"
1065   ;; Should finish the parse.
1066   (js2-mode--and-parse))
1067
1068 ;;; Comments
1069
1070 (js2-deftest comment-node-length "//"
1071   (js2-mode--and-parse)
1072   (let ((node (js2-node-at-point (point-min))))
1073     (should (= (js2-node-len node) 2))))
1074
1075 (js2-deftest comment-node-length-newline "//\n"
1076   (js2-mode--and-parse)
1077   (let ((node (js2-node-at-point (point-min))))
1078     (should (= (js2-node-len node) 3))))
1079
1080 ;;; Variables classification
1081
1082 (defun js2--variables-summary (vars)
1083   (let (r)
1084     (setq vars (let (aslist)
1085                  (maphash (lambda (k v) (push (cons k v) aslist)) vars)
1086                  aslist))
1087     (dolist (v (sort vars (lambda (a b) (< (js2-node-abs-pos (js2-symbol-ast-node (car a)))
1088                                       (js2-node-abs-pos (js2-symbol-ast-node (car b)))))))
1089       (let* ((symbol (car v))
1090              (inition (cadr v))
1091              (uses (cddr v))
1092              (symn (js2-symbol-ast-node symbol))
1093              (namen (js2--get-name-node symn)))
1094         (push (format "%s@%s:%s"
1095                       (js2-symbol-name symbol)
1096                       (js2-node-abs-pos namen)
1097                       (if (eq inition ?P)
1098                           "P"
1099                         (if uses
1100                             (if inition "I" "N")
1101                           "U"))) r)
1102         (dolist (u (sort (cddr v) (lambda (a b) (< (js2-node-abs-pos a)
1103                                               (js2-node-abs-pos b)))))
1104           (push (js2-node-abs-pos u) r))))
1105     (reverse r)))
1106
1107 (defmacro js2-deftest-classify-variables (name buffer-contents summary)
1108  (declare (indent defun))
1109   `(ert-deftest ,(intern (format "js2-classify-variables-%s" name)) ()
1110      (with-temp-buffer
1111        (save-excursion
1112          (insert ,buffer-contents))
1113        (unwind-protect
1114            (progn
1115              (js2-mode--and-parse)
1116              (should (equal ,summary (js2--variables-summary
1117                                       (js2--classify-variables)))))
1118          (fundamental-mode)))))
1119
1120 (js2-deftest-classify-variables incomplete-var-statement
1121   "var"
1122   '())
1123
1124 (js2-deftest-classify-variables unused-variable
1125   "function foo () { var x; return 42; }"
1126   '("foo@10:U" "x@23:U"))
1127
1128 (js2-deftest-classify-variables unused-variable-declared-twice
1129   "function foo (a) { var x; function bar () { var x; x=42; }; return a;}"
1130   '("foo@10:U" "a@15:P" 68 "x@24:U" "bar@36:U" "x@49:U"))
1131
1132 (js2-deftest-classify-variables assigned-variable
1133   "function foo () { var x; x=42; return x; }"
1134   '("foo@10:U" "x@23:I" 39))
1135
1136 (js2-deftest-classify-variables assignment-in-nested-function
1137   "function foo () { var x; function bar () { x=42; }; }"
1138   '("foo@10:U" "x@23:U" "bar@35:U"))
1139
1140 (js2-deftest-classify-variables unused-nested-function
1141   "function foo() { var i, j=1; function bar() { var x, y=42, z=i; return y; } return i; }"
1142   '("foo@10:U" "i@22:N" 62 84 "j@25:U" "bar@39:U" "x@51:U" "y@54:I" 72 "z@60:U"))
1143
1144 (js2-deftest-classify-variables prop-get-initialized
1145   "function foo () { var x, y={}; y.a=x; }"
1146   '("foo@10:U" "x@23:N" 36 "y@26:I" 32))
1147
1148 (js2-deftest-classify-variables prop-get-uninitialized
1149   "function foo () { var x; if(x.foo) alert('boom'); }"
1150   '("foo@10:U" "x@23:N" 29))
1151
1152 (js2-deftest-classify-variables prop-get-function-assignment
1153   "(function(w) { w.f = function() { var a=42, m; return a; }; })(window);"
1154   '("w@11:P" 11 16 "a@39:I" 55 "m@45:U"))
1155
1156 (js2-deftest-classify-variables let-declaration
1157   "function foo () { let x,y=1; return x; }"
1158   '("foo@10:U" "x@23:N" 37 "y@25:U"))
1159
1160 (js2-deftest-classify-variables external-function-call
1161   "function foo (m) { console.log(m, arguments); }"
1162   '("foo@10:U" "m@15:P" 32))
1163
1164 (js2-deftest-classify-variables global-function-call
1165   "function bar () { return 42; } function foo (a) { return bar(); }"
1166   '("bar@10:I" 58 "foo@41:U" "a@46:P"))
1167
1168 (js2-deftest-classify-variables let-declaration-for-scope
1169   "function foo () { for(let x=1,y; x<y; y++) {} }"
1170   '("foo@10:U" "x@27:I" 34 "y@31:N" 36 39))
1171
1172 (js2-deftest-classify-variables arguments-implicit-var
1173   "function foo () { var p; for(p in arguments) { return p; } }"
1174   '("foo@10:U" "p@23:I" 55))
1175
1176 (js2-deftest-classify-variables catch-error-variable
1177   "function foo () { try { throw 'Foo'; } catch (e) { console.log(e); }"
1178   '("foo@10:U" "e@47:I" 64))
1179
1180 (js2-deftest-classify-variables prop-get-assignment
1181   "function foo () { var x={y:{z:{}}}; x.y.z=42; }"
1182   '("foo@10:U" "x@23:I" 37))
1183
1184 (js2-deftest-classify-variables unused-function-argument
1185   "function foo (a) { return 42; }"
1186   '("foo@10:U" "a@15:P"))
1187
1188 (js2-deftest-classify-variables used-function-argument
1189   "function foo (a) { a=42; return a; }"
1190   '("foo@10:U" "a@15:P" 33))
1191
1192 (js2-deftest-classify-variables prop-get
1193   "function foo (a) { a=navigator.x||navigator.y; return a; }"
1194   '("foo@10:U" "a@15:P" 55))
1195
1196 (js2-deftest-classify-variables for-in-loop
1197   "function foo () { var d={}; for(var k in d) {var v=d[k]; } }"
1198   '("foo@10:U" "d@23:I" 42 52 "k@37:I" 54 "v@50:U"))
1199
1200 (js2-deftest-classify-variables array-comprehension-legacy
1201   "function foo() { var j,a=[for (i of [1,2,3]) i*j]; }"
1202   '("foo@10:U" "j@22:N" 48 "a@24:U" "i@32:I" 46))
1203
1204 (js2-deftest-classify-variables array-comprehension
1205   "function foo() { var j,a=[[i,j] for (i of [1,2,3])]; }"
1206   '("foo@10:U" "j@22:N" 30 "a@24:U" "i@38:I" 28))
1207
1208 (js2-deftest-classify-variables return-named-function
1209   "function foo() { var a=42; return function bar() { return a; } }"
1210   '("foo@10:U" "a@22:I" 59 "bar@44:I" 44))
1211
1212 (js2-deftest-classify-variables named-wrapper-function
1213   "function foo() { var a; (function bar() { a=42; })(); return a; }"
1214   '("foo@10:U" "a@22:I" 62 "bar@35:I" 35))