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