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 ;;; Object literals
 182
 183 (js2-deftest-parse object-literal-shorthand
 184   "var x = {a: 1, b, c: 1, d};")
 185
 186 (js2-deftest-parse object-literal-shorthard-with-number
 187   "var a = {1};" :syntax-error "}" :errors-count 2)
 188
 189 (js2-deftest-parse object-literal-method
 190   "var x = {f(y) {  return y;\n}};")
 191
 192 (js2-deftest-parse object-literal-getter-method
 193   "var x = {get f() {  return 42;\n}};")
 194
 195 (js2-deftest-parse object-literal-setter-method
 196   "var x = {set f(y) {  x = y;\n}};")
 197
 198 (js2-deftest-parse object-literal-computed-keys
 199   "var x = {[Symbol.iterator]: function() {}};")
 200
 201 (js2-deftest-parse object-literal-computed-function-keys
 202   "var x = {[foo + bar](y) {  return y;\n}};")
 203
 204 (js2-deftest-parse object-literal-computed-getter-key
 205   "var x = {get [foo + bar]() {  return 42;\n}};")
 206
 207 (js2-deftest-parse object-literal-generator
 208   "var x = {*foo() {  yield 42;\n}};")
 209
 210 (js2-deftest-parse object-literal-computed-generator-key
 211   "var x = {*[foo + bar]() {  yield 42;\n}};")
 212
 213 ;;; Function definition
 214
 215 (js2-deftest function-redeclaring-var "var gen = 3; function gen() {};"
 216   (js2-mode)
 217   (should (= (length (js2-ast-root-warnings js2-mode-ast)) 1)))
 218
 219 (js2-deftest function-expression-var-same-name "var gen = function gen() {};"
 220   (js2-mode)
 221   (should (null (js2-ast-root-warnings js2-mode-ast))))
 222
 223 ;;; Function parameters
 224
 225 (js2-deftest-parse function-with-default-parameters
 226   "function foo(a = 1, b = a + 1) {\n}")
 227
 228 (js2-deftest-parse function-with-no-default-after-default
 229   "function foo(a = 1, b) {\n}"
 230   :syntax-error "b")
 231
 232 (js2-deftest-parse function-with-destruct-after-default
 233   "function foo(a = 1, {b, c}) {\n}"
 234   :syntax-error "{")
 235
 236 (js2-deftest-parse function-with-rest-parameter
 237   "function foo(a, b, ...rest) {\n}")
 238
 239 (js2-deftest-parse function-with-param-after-rest-parameter
 240   "function foo(a, ...b, rest) {\n}"
 241   :syntax-error "rest")
 242
 243 (js2-deftest-parse function-with-destruct-after-rest-parameter
 244   "function foo(a, ...b, {}) {\n}"
 245   :syntax-error "{}")
 246
 247 (js2-deftest-parse function-with-rest-after-default-parameter
 248   "function foo(a = 1, ...rest) {\n}")
 249
 250 ;;; Strict identifiers
 251
 252 (js2-deftest-parse function-bad-strict-parameters
 253   "'use strict';\nfunction foo(eval, {arguments}, bar) {\n}"
 254   :syntax-error "eval" :errors-count 2)
 255
 256 (js2-deftest-parse function-retroactive-bad-strict-parameters
 257   "function foo(arguments) {'use strict';}"
 258   :syntax-error "arguments" :errors-count 1)
 259
 260 (js2-deftest-parse function-duplicate-strict-parameters
 261   "'use strict';\nfunction foo(a, a) {\n}"
 262   :syntax-error "a" :errors-count 1)
 263
 264 (js2-deftest-parse function-bad-strict-function-name
 265   "'use strict';\nfunction eval() {\n}"
 266   :syntax-error "eval" :errors-count 1)
 267
 268 (js2-deftest-parse function-bad-retroactive-strict-function-name
 269   "function arguments() {'use strict';}"
 270   :syntax-error "arguments" :errors-count 1)
 271
 272 (js2-deftest-parse function-bad-strict-catch-name
 273   "'use strict';\ntry {} catch (eval) {}"
 274   :syntax-error "eval" :errors-count 1)
 275
 276 (js2-deftest-parse function-bad-strict-variable-name
 277   "'use strict';\nvar eval = 'kekeke';"
 278   :syntax-error "eval" :errors-count 1)
 279
 280 (js2-deftest-parse function-bad-strict-assignment
 281   "'use strict';\narguments = 'fufufu';"
 282   :syntax-error "arguments" :errors-count 1)
 283
 284 ;;; Strict syntax errors
 285
 286 (js2-deftest-parse function-strict-with
 287   "'use strict';\nwith ({}) {}"
 288   :syntax-error "with" :errors-count 1)
 289
 290 (js2-deftest-parse function-strict-octal
 291   "'use strict';\nvar number = 0644;"
 292   :syntax-error "0644" :errors-count 1)
 293
 294 ;;; Spread operator
 295
 296 (js2-deftest-parse spread-in-array-literal
 297   "[1, ...[2, 3], 4, ...[5, 6]];")
 298
 299 (js2-deftest-parse spread-in-function-call
 300   "f(3, ...[t(2), t(3)], 42, ...[t(4)]);")
 301
 302 ;;; Arrow functions
 303
 304 (js2-deftest-parse arrow-function-with-empty-args-and-no-curlies
 305   "() => false;" :reference "() => {false};")
 306
 307 (js2-deftest-parse arrow-function-with-args-and-curlies
 308   "(a, b = 1, ...c) => {  c;\n};")
 309
 310 (js2-deftest-parse arrow-function-with-destructuring
 311   "([{a}, b]) => {  a + b;\n};")
 312
 313 (js2-deftest-parse parenless-arrow-function-prohibits-rest
 314   "...b => {b + 1;};" :syntax-error "=>")
 315
 316 (js2-deftest-parse parenless-arrow-function-prohibits-destructuring
 317   "[a, b] => {a + b;};" :syntax-error "]" :errors-count 4)
 318
 319 (js2-deftest-parse arrow-function-recovers-from-error
 320   "[(,foo) => 1];" :syntax-error "," :errors-count 6)
 321
 322 ;;; Automatic semicolon insertion
 323
 324 (js2-deftest-parse no-auto-semi-insertion-after-if
 325   "if (true) {\n}")
 326
 327 (js2-deftest-parse auto-semi-insertion-after-function
 328   "a = function() {}" :reference "a = function() {};")
 329
 330 (js2-deftest-parse auto-semi-one-variable-per-line
 331   "x\ny" :reference "x;\ny;")
 332
 333 ;;; Labels
 334
 335 (js2-deftest-parse labeled-stmt-node
 336   "foo:\nbar:\nx = y + 1;")
 337
 338 (js2-deftest no-label-node-inside-expr "x = y:"
 339   (let (js2-parse-interruptable-p)
 340     (js2-mode))
 341   (let ((assignment (js2-expr-stmt-node-expr (car (js2-scope-kids js2-mode-ast)))))
 342     (should (js2-name-node-p (js2-assign-node-right assignment)))))
 343
 344 (js2-deftest-parse label-and-loops "for (; ; ) {
 345   loop:
 346   for (; ; ) {
 347     continue loop;
 348   }
 349 }")
 350
 351 ;;; Generators
 352
 353 (js2-deftest-parse legacy-generator "function foo() {\n  yield 1;\n}")
 354
 355 (js2-deftest-parse legacy-generator-cannot-return
 356   "function foo() {\n  yield 1;\n return 2;\n}" :syntax-error "return 2")
 357
 358 (js2-deftest-parse harmony-generator "function* bar() {\n  yield 2;\n  return 3;\n}")
 359
 360 (js2-deftest-parse harmony-generator-yield-star "(function*(a) {  yield* a;\n});")
 361
 362 ;;; Comprehensions
 363
 364 (js2-deftest-parse parse-legacy-array-comp-loop-with-filter
 365   "[a for (a in b) if (a == 2)];")
 366
 367 (js2-deftest-parse parse-array-comp-loop-with-filters
 368   "[for (a in b) if (a == 2) if (b != 10) a];")
 369
 370 (js2-deftest-parse parse-generator-comp-loop-with-filters
 371   "(for (x of y) if (x != 4) x);")
 372
 373 (js2-deftest-parse parse-array-comp-with-yield-is-ok
 374   "(function() {  return [for (x of []) yield x];\n});")
 375
 376 (js2-deftest-parse parse-generator-comp-with-yield-is-not-ok
 377   "(function() {  return (for (x of []) yield x);\n});"
 378   :syntax-error "yield")
 379
 380 (js2-deftest-parse parse-generator-comp-with-yield-inside-function-is-ok
 381   "(for (x of []) function*() {  yield x;\n});")
 382
 383 ;;; Numbers
 384
 385 (js2-deftest-parse decimal-starting-with-zero "081;" :reference "81;")
 386
 387 (js2-deftest-parse huge-hex "0x0123456789abcdefABCDEF;" :reference "-1;")
 388
 389 (js2-deftest-parse octal-without-o "071;" :reference "57;")
 390
 391 (js2-deftest-parse hex-number-okay "0x123;" :reference "291;")
 392
 393 (js2-deftest-parse hex-number-broken "0xz23;"
 394   :syntax-error "0xz" :errors-count 2)
 395
 396 (js2-deftest-parse binary-number-okay "0b101;" :reference "5;")
 397
 398 (js2-deftest-parse binary-number-broken "0b210;"
 399   :syntax-error "0b2" :errors-count 2)
 400
 401 (js2-deftest-parse octal-number-okay "0o765;" :reference "501;")
 402
 403 (js2-deftest-parse octal-number-broken "0o812;"
 404   :syntax-error "0o8" :errors-count 2)
 405
 406 ;;; Modules
 407
 408 (js2-deftest parse-export-bindings "{one, two as dos}"
 409   (js2-init-scanner)
 410   (should (js2-match-token js2-LC))
 411   (let ((imports (js2-parse-export-bindings)))
 412     (should (not (equal nil imports)))
 413     (should (= 2 (length imports)))
 414     (let ((first (nth 0 imports))
 415           (second (nth 1 imports)))
 416       (should (equal "one" (js2-name-node-name (js2-export-binding-node-extern-name first))))
 417       (should (equal "two" (js2-name-node-name (js2-export-binding-node-extern-name second))))
 418       (let ((first-name (js2-export-binding-node-local-name first))
 419             (second-name (js2-export-binding-node-local-name second)))
 420         (should (equal first (js2-node-parent first-name)))
 421         (should (equal 3 (js2-node-len first-name)))
 422         (should (equal "one" (js2-name-node-name first-name)))
 423         (should (equal second (js2-node-parent second-name)))
 424         (should (equal 3 (js2-node-len second-name)))
 425         (should (equal "dos" (js2-name-node-name second-name)))))))
 426
 427 (js2-deftest parse-export-binding-as-default "one as default"
 428   (js2-init-scanner)
 429   (let ((binding (js2-maybe-parse-export-binding)))
 430     (should binding)
 431     (should (js2-export-binding-node-p binding))
 432     (let ((name (js2-export-binding-node-local-name binding)))
 433       (should name)
 434       (should (equal "default" (js2-name-node-name name))))))
 435
 436 (js2-deftest parse-namepsace-import "* as lib;"
 437   (js2-init-scanner)
 438   (should (js2-match-token js2-MUL))
 439   (let ((namespace-import (js2-parse-namespace-import)))
 440     (should (not (equal nil namespace-import)))
 441     (should (js2-namespace-import-node-p namespace-import))
 442     (should (= 1 (js2-node-pos namespace-import)))
 443     (should (equal 8 (js2-node-len namespace-import)))
 444     (let ((name-node (js2-namespace-import-node-name namespace-import)))
 445       (should (equal "lib" (js2-name-node-name name-node)))
 446       (should (= 5 (js2-node-pos name-node))))))
 447
 448 (js2-deftest parse-from-clause "from 'foo/bar';"
 449   (js2-init-scanner)
 450   (let ((from (js2-parse-from-clause)))
 451     (should (not (equal nil from)))
 452     (should (= 1 (js2-node-pos from)))
 453     (should (= 14 (js2-node-len from)))
 454     (should (equal "foo/bar" (js2-from-clause-node-module-id from)))))
 455
 456 (js2-deftest parse-import-module-id-only "import 'src/lib'"
 457   (js2-init-scanner)
 458   (should (js2-match-token js2-IMPORT))
 459   (let ((import (js2-parse-import)))
 460     (should (not (equal nil import)))
 461     (should (= 1 (js2-node-pos import)))
 462     (should (= 16 (js2-node-len import)))
 463     (should (equal nil (js2-import-node-import import)))
 464     (should (equal nil (js2-import-node-from import)))))
 465
 466 (js2-deftest parse-imported-default-binding "import theDefault from 'src/lib'"
 467   (js2-push-scope (make-js2-scope :pos 0))
 468   (js2-init-scanner)
 469   (should (js2-match-token js2-IMPORT))
 470   (let ((import-node (js2-parse-import)))
 471     (should (not (equal nil import-node)))
 472     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 473     (let ((import (js2-import-node-import import-node)))
 474       (should (not (equal nil import)))
 475       (should (equal nil (js2-import-clause-node-namespace-import import)))
 476       (should (equal nil (js2-import-clause-node-named-imports import)))
 477       (let ((default (js2-import-clause-node-default-binding import)))
 478         (should (not (equal nil default)))
 479         (should (js2-export-binding-node-p default))
 480         (should (equal "theDefault" (js2-name-node-name (js2-export-binding-node-extern-name default)))))))
 481   (should (js2-scope-get-symbol js2-current-scope "theDefault")))
 482
 483 (js2-deftest parse-import-namespace-binding "import * as lib from 'src/lib'"
 484   (js2-push-scope (make-js2-scope :pos 0))
 485   (js2-init-scanner)
 486   (should (js2-match-token js2-IMPORT))
 487   (let ((import-node (js2-parse-import)))
 488     (should (not (equal nil import-node)))
 489     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 490     (let ((import (js2-import-node-import import-node)))
 491       (should (not (equal nil import)))
 492       (should (equal nil (js2-import-clause-node-default-binding import)))
 493       (should (equal nil (js2-import-clause-node-named-imports import)))
 494       (let ((ns-import (js2-import-clause-node-namespace-import import)))
 495         (should (not (equal nil ns-import)))
 496         (should (js2-namespace-import-node-p ns-import))
 497         (should (equal "lib" (js2-name-node-name (js2-namespace-import-node-name ns-import)))))))
 498   (should (js2-scope-get-symbol js2-current-scope "lib")))
 499
 500 (js2-deftest parse-import-named-imports "import {foo as bar, baz} from 'src/lib'"
 501   (js2-push-scope (make-js2-scope :pos 0))
 502   (js2-init-scanner)
 503   (should (js2-match-token js2-IMPORT))
 504   (let ((import-node (js2-parse-import)))
 505     (should (not (equal nil import-node)))
 506     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 507     (let ((import (js2-import-node-import import-node)))
 508       (should (not (equal nil import)))
 509       (should (equal nil (js2-import-clause-node-default-binding import)))
 510       (should (equal nil (js2-import-clause-node-namespace-import import)))
 511       (let ((named-imports (js2-import-clause-node-named-imports import)))
 512         (should (not (equal nil named-imports)))
 513         (should (listp named-imports))
 514         (should (= 2 (length named-imports)))
 515         (let ((first (nth 0 named-imports))
 516               (second (nth 1 named-imports)))
 517           (should (equal "bar" (js2-name-node-name (js2-export-binding-node-local-name first))))
 518           (should (equal "baz" (js2-name-node-name (js2-export-binding-node-local-name second))))))))
 519   (should (js2-scope-get-symbol js2-current-scope "bar"))
 520   (should (js2-scope-get-symbol js2-current-scope "baz")))
 521
 522 (js2-deftest parse-import-default-and-namespace "import stuff, * as lib from 'src/lib'"
 523   (js2-push-scope (make-js2-scope :pos 0))
 524   (js2-init-scanner)
 525   (should (js2-match-token js2-IMPORT))
 526   (let ((import-node (js2-parse-import)))
 527     (should (not (equal nil import-node)))
 528     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 529     (let ((import (js2-import-node-import import-node)))
 530       (should (not (equal nil import)))
 531       (should (equal nil (js2-import-clause-node-named-imports import)))
 532       (let ((default (js2-import-clause-node-default-binding import))
 533             (ns-import (js2-import-clause-node-namespace-import import)))
 534         (should (not (equal nil default)))
 535         (should (equal "stuff" (js2-name-node-name (js2-export-binding-node-local-name default))))
 536         (should (not (equal nil ns-import)))
 537         (should (js2-namespace-import-node-p ns-import))
 538         (should (equal "lib" (js2-name-node-name (js2-namespace-import-node-name ns-import)))))))
 539   (should (js2-scope-get-symbol js2-current-scope "stuff"))
 540   (should (js2-scope-get-symbol js2-current-scope "lib")))
 541
 542 (js2-deftest parse-import-default-and-named-imports
 543   "import robert as bob, {cookies, pi as PIE} from 'src/lib'"
 544   (js2-push-scope (make-js2-scope :pos 0))
 545   (js2-init-scanner)
 546   (should (js2-match-token js2-IMPORT))
 547   (let ((import-node (js2-parse-import)))
 548     (should (not (equal nil import-node)))
 549     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 550     (let ((import (js2-import-node-import import-node)))
 551       (should (not (equal nil import)))
 552       (should (not (equal nil (js2-import-clause-node-named-imports import))))
 553       (let ((default (js2-import-clause-node-default-binding import))
 554             (named-imports (js2-import-clause-node-named-imports import)))
 555         (should (not (equal nil default)))
 556         (should (equal "bob" (js2-name-node-name (js2-export-binding-node-local-name default))))
 557         (should (not (equal nil named-imports)))
 558         (should (= 2 (length named-imports))))))
 559   (should (js2-scope-get-symbol js2-current-scope "bob"))
 560   (should (js2-scope-get-symbol js2-current-scope "cookies"))
 561   (should (js2-scope-get-symbol js2-current-scope "PIE")))
 562
 563 (js2-deftest parse-this-module-in-from-clause "import {url} from this module;"
 564   (js2-push-scope (make-js2-scope :pos 0))
 565   (js2-init-scanner)
 566   (should (js2-match-token js2-IMPORT))
 567   (let ((import-node (js2-parse-import)))
 568     (should import-node)
 569     (let ((from-clause (js2-import-node-from import-node)))
 570       (should from-clause)
 571       (should (equal "this" (js2-from-clause-node-module-id from-clause)))
 572       (should (js2-from-clause-node-metadata-p from-clause)))))
 573
 574 (js2-deftest-parse import-only-for-side-effects "import 'src/lib';")
 575 (js2-deftest-parse import-default-only "import theDefault from 'src/lib';")
 576 (js2-deftest-parse import-named-only "import {one, two} from 'src/lib';")
 577 (js2-deftest-parse import-default-and-named "import theDefault, {one, two} from 'src/lib';")
 578 (js2-deftest-parse import-renaming-default "import * as lib from 'src/mylib';")
 579 (js2-deftest-parse import-renaming-named "import {one as uno, two as dos} from 'src/lib';")
 580 (js2-deftest-parse import-default-and-namespace "import robert as bob, * as lib from 'src/lib';")
 581 (js2-deftest-parse import-from-this-module "import {url} from this module;")
 582
 583 ;; Module Exports
 584
 585 (js2-deftest export-rexport "export * from 'other/lib'"
 586   (js2-init-scanner)
 587   (should (js2-match-token js2-EXPORT))
 588   (let ((export-node (js2-parse-export)))
 589     (should export-node)
 590     (should (js2-export-node-from-clause export-node))))
 591
 592 (js2-deftest export-export-named-list "export {foo, bar as bang};"
 593   (js2-init-scanner)
 594   (should (js2-match-token js2-EXPORT))
 595   (let ((export-node (js2-parse-export)))
 596     (should export-node)
 597     (let ((exports (js2-export-node-exports-list export-node)))
 598       (should exports)
 599       (should (= 2 (length exports))))))
 600
 601 (js2-deftest re-export-named-list "export {foo, bar as bang} from 'other/lib'"
 602   (js2-init-scanner)
 603   (should (js2-match-token js2-EXPORT))
 604   (let ((export-node (js2-parse-export)))
 605     (should export-node)
 606     (should (js2-export-node-from-clause export-node))
 607     (let ((exports (js2-export-node-exports-list export-node)))
 608       (should exports)
 609       (should (= 2 (length exports))))))
 610
 611 (js2-deftest export-variable-statement "export var foo = 'bar', baz = 'bang';"
 612   (js2-init-scanner)
 613   (js2-push-scope (make-js2-scope :pos 0))
 614   (should (js2-match-token js2-EXPORT))
 615   (let ((export-node (js2-parse-export)))
 616     (should export-node)
 617     (should (js2-export-node-declaration export-node))))
 618
 619 (js2-deftest export-const-declaration "export const PI = Math.PI;"
 620   (js2-init-scanner)
 621   (js2-push-scope (make-js2-scope :pos 0))
 622   (should (js2-match-token js2-EXPORT))
 623   (let ((export-node (js2-parse-export)))
 624     (should export-node)
 625     (should (js2-export-node-declaration export-node))))
 626
 627 (js2-deftest export-let-declaration "export let foo = [1];"
 628   (js2-init-scanner)
 629   (js2-push-scope (make-js2-scope :pos 0))
 630   (should (js2-match-token js2-EXPORT))
 631   (let ((export-node (js2-parse-export)))
 632     (should export-node)
 633     (should (js2-var-decl-node-p (js2-export-node-declaration export-node)))))
 634
 635 (js2-deftest export-class-declaration "export class Foo {};"
 636   (js2-init-scanner)
 637   (js2-push-scope (make-js2-scope :pos 0))
 638   (should (js2-match-token js2-EXPORT))
 639   (let ((export-node (js2-parse-export)))
 640     (should export-node)
 641     (should (js2-class-node-p (js2-export-node-declaration export-node)))))
 642
 643 (js2-deftest export-function-declaration "export default function doStuff() {};"
 644   (js2-init-scanner)
 645   (js2-push-scope (make-js2-scope :pos 0))
 646   (should (js2-match-token js2-EXPORT))
 647   (let ((export-node (js2-parse-export)))
 648     (should export-node)
 649     (should (js2-export-node-default export-node))))
 650
 651 (js2-deftest export-generator-declaration "export default function* one() {};"
 652   (js2-init-scanner)
 653   (js2-push-scope (make-js2-scope :pos 0))
 654   (should (js2-match-token js2-EXPORT))
 655   (let ((export-node (js2-parse-export)))
 656     (should export-node)
 657     (should (js2-export-node-default export-node))))
 658
 659 (js2-deftest export-assignment-expression "export default a = b;"
 660   (js2-init-scanner)
 661   (js2-push-scope (make-js2-scope :pos 0))
 662   (should (js2-match-token js2-EXPORT))
 663   (let ((export-node (js2-parse-export)))
 664     (should export-node)
 665     (should (js2-export-node-default export-node))))
 666
 667 (js2-deftest export-function-no-semicolon "export default function foo() {}"
 668   (js2-mode)
 669   (should (equal nil js2-parsed-warnings)))
 670 (js2-deftest export-default-function-no-semicolon "export function foo() {}"
 671   (js2-mode)
 672   (should (equal nil js2-parsed-warnings)))
 673 (js2-deftest export-anything-else-does-require-a-semicolon "export var obj = {}"
 674   (js2-mode)
 675   (should (not (equal nil js2-parsed-warnings))))
 676
 677 (js2-deftest-parse parse-export-rexport "export * from 'other/lib';")
 678 (js2-deftest-parse parse-export-export-named-list "export {foo, bar as bang};")
 679 (js2-deftest-parse parse-re-export-named-list "export {foo, bar as bang} from 'other/lib';")
 680 (js2-deftest-parse parse-export-const-declaration "export const PI = Math.PI;")
 681 (js2-deftest-parse parse-export-let-declaration "export let foo = [1];")
 682 (js2-deftest-parse parse-export-function-declaration "export default function doStuff() {};")
 683 (js2-deftest-parse parse-export-generator-declaration "export default function* one() {};")
 684 (js2-deftest-parse parse-export-assignment-expression "export default a = b;")
 685
 686 ;;; Strings
 687
 688 (js2-deftest-parse string-literal
 689   "var x = 'y';")
 690
 691 (js2-deftest-parse object-get-string-literal
 692   "var x = {y: 5};\nvar z = x[\"y\"];")
 693
 694 (js2-deftest-parse template-no-substritutions
 695   "var x = `abc
 696             def`, y = `\\u0000`;")
 697
 698 (js2-deftest-parse template-with-substitutions
 699   "var y = `${a + b} ${d + e + f}`;")
 700
 701 (js2-deftest-parse tagged-template
 702   "foo.args`${++x, \"o\"}k`;")
 703
 704 ;;; Classes
 705
 706 (js2-deftest-parse parse-harmony-class-statement
 707   "class Foo {\n  get bar() {  return 42;\n}\n  set bar(x) {  y = x;\n}\n}")
 708
 709 (js2-deftest-parse parse-harmony-class-statement-without-name-is-not-ok
 710   "class {\n  get bar() {  return 42;\n}\n}"
 711   :syntax-error "{")
 712
 713 (js2-deftest-parse parse-harmony-class-expression
 714   "var Foo1 = class Foo {\n  bar() {  return 42;\n}\n};")
 715
 716 (js2-deftest-parse parse-harmony-anonymous-class-expression
 717   "var Foo = class {\n  set bar(x) {  bar = x;\n}\n};")
 718
 719 (js2-deftest-parse parse-harmony-class-with-extends
 720   "class Foo extends Bar {\n}")
 721
 722 (js2-deftest-parse parse-harmony-anonymous-class-with-extends
 723   "foo.Foo = class extends Bar {\n  set bar(x) {  bar = x;\n}\n};")
 724
 725 (js2-deftest-parse parse-harmony-class-with-complex-extends
 726   "class Foo extends foo[BAR][2].Baz {\n}")
 727
 728 (js2-deftest-parse parse-harmony-class-missing-extended-class-is-not-ok
 729   "class Foo extends {\n}"
 730   :syntax-error "extends")
 731
 732 (js2-deftest-parse parse-harmony-class-static-method
 733   "class Foo extends Bar {\n  static bar() {  return 42;\n}\n}")
 734
 735 (js2-deftest-parse parse-unterminated-class-is-not-okay
 736   "class Foo {\n  get bar() {  return 42;\n}"
 737   :syntax-error "}")
 738
 739 (js2-deftest-parse parse-super-keyword
 740   "class Foo {\n  constructor() {  super(42);\n}\n  foo() {  super.foo();\n}\n}")
 741
 742 (js2-deftest-parse parse-class-keywordlike-method
 743   "class C {\n  delete() {}\n  if() {}\n}")
 744
 745 ;;; Scopes
 746
 747 (js2-deftest ast-symbol-table-includes-fn-node "function foo() {}"
 748   (js2-mode)
 749   (let ((entry (js2-scope-get-symbol js2-mode-ast 'foo)))
 750     (should (= (js2-symbol-decl-type entry) js2-FUNCTION))
 751     (should (equal (js2-symbol-name entry) "foo"))
 752     (should (js2-function-node-p (js2-symbol-ast-node entry)))))
 753
 754 (js2-deftest fn-symbol-table-includes-nested-fn "function foo() {
 755   function bar() {}
 756   var x;
 757 }"
 758   (js2-mode)
 759   (let* ((scope (js2-node-at-point (point-min)))
 760          (fn-entry (js2-scope-get-symbol scope 'bar))
 761          (var-entry (js2-scope-get-symbol scope 'x)))
 762     (should (string= (js2-name-node-name (js2-function-node-name scope)) "foo"))
 763     (should (= (js2-symbol-decl-type fn-entry) js2-FUNCTION))
 764     (should (js2-function-node-p (js2-symbol-ast-node fn-entry)))
 765     (should (= (js2-symbol-decl-type var-entry) js2-VAR))
 766     (should (js2-name-node-p (js2-symbol-ast-node var-entry)))))
 767
 768 (defun js2-test-scope-of-nth-variable-satisifies-predicate (variable nth predicate)
 769   (goto-char (point-min))
 770   (dotimes (n (1+ nth)) (search-forward variable))
 771   (forward-char -1)
 772   (let ((scope (js2-node-get-enclosing-scope (js2-node-at-point))))
 773     (should (funcall predicate (js2-get-defining-scope scope variable)))))
 774
 775 (js2-deftest for-node-is-declaration-scope "for (let i = 0; i; ++i) {};"
 776   (js2-mode)
 777   (js2-test-scope-of-nth-variable-satisifies-predicate "i" 0 #'js2-for-node-p))
 778
 779 (js2-deftest const-scope-sloppy-script "{const a;} a;"
 780   (js2-mode)
 781   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 0 #'js2-script-node-p)
 782   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 1 #'js2-script-node-p))
 783
 784 (js2-deftest const-scope-strict-script "'use strict'; { const a; } a;"
 785   (js2-mode)
 786   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 0 #'js2-block-node-p)
 787   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 1 #'null))
 788
 789 (js2-deftest const-scope-sloppy-function "function f() { { const a; } a; }"
 790   (js2-mode)
 791   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 0 #'js2-function-node-p)
 792   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 1 #'js2-function-node-p))
 793
 794 (js2-deftest const-scope-strict-function "function f() { 'use strict'; { const a; } a; }"
 795   (js2-mode)
 796   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 0 #'js2-block-node-p)
 797   (js2-test-scope-of-nth-variable-satisifies-predicate "a" 1 #'null))
 798
 799 (js2-deftest array-comp-is-result-scope "[x * 2 for (x in y)];"
 800   (js2-mode)
 801   (js2-test-scope-of-nth-variable-satisifies-predicate "x" 0 #'js2-comp-loop-node-p))
 802
 803 (js2-deftest array-comp-has-parent-scope
 804              "var a,b=[for (i of [[1,2]]) for (j of i) j * a];"
 805   (js2-mode)
 806   (search-forward "for")
 807   (forward-char -3)
 808   (let ((node (js2-node-at-point)))
 809     (should (js2-scope-parent-scope node))
 810     (should (js2-get-defining-scope node "j"))))
 811
 812 ;;; Tokenizer
 813
 814 (js2-deftest get-token "(1+1)"
 815   (js2-init-scanner)
 816   (should (eq js2-LP (js2-next-token)))
 817   (should (eq js2-NUMBER (js2-next-token)))
 818   (should (eq js2-ADD (js2-next-token)))
 819   (should (eq js2-NUMBER (js2-next-token)))
 820   (should (eq js2-RP (js2-next-token))))
 821
 822 (js2-deftest unget-token "()"
 823   (js2-init-scanner)
 824   (should (eq js2-LP (js2-next-token)))
 825   (js2-unget-token)
 826   (should (eq js2-LP (js2-next-token)))
 827   (should (eq js2-RP (js2-next-token))))
 828
 829 (js2-deftest get-token-or-eol "x\n++;"
 830   (js2-init-scanner)
 831   (should (eq js2-NAME (js2-next-token)))
 832   (should (eq js2-EOL (js2-peek-token-or-eol)))
 833   (should (eq js2-INC (js2-next-token)))
 834   (should (eq js2-SEMI (js2-peek-token-or-eol))))
 835
 836 (js2-deftest unget-token-over-eol-and-comment "x\n//abc\ny"
 837   (js2-init-scanner)
 838   (should (eq js2-NAME (js2-next-token)))
 839   (should (eq js2-NAME (js2-next-token)))
 840   (should (equal "y" (js2-current-token-string)))
 841   (js2-unget-token)
 842   (should (eq js2-NAME (js2-current-token-type)))
 843   (should (equal "x" (js2-current-token-string))))
 844
 845 (js2-deftest ts-seek "(1+2)"
 846   (js2-init-scanner)
 847   (should (eq js2-LP (js2-next-token)))
 848   (should (eq js2-NUMBER (js2-next-token)))
 849   (js2-unget-token)
 850   (let ((state (make-js2-ts-state)))
 851     (should (eq js2-NUMBER (js2-next-token)))
 852     (should (eq js2-ADD (js2-next-token)))
 853     (js2-ts-seek state)
 854     (should (eq 1 js2-ti-lookahead))
 855     (should (eq js2-NUMBER (js2-next-token)))
 856     (should (eq 1 (js2-token-number
 857                    (js2-current-token))))))
 858
 859 (js2-deftest get-token-template-literal "`abc ${i} z ${j} def`"
 860   (js2-init-scanner)
 861   (should (eq js2-TEMPLATE_HEAD (js2-next-token)))
 862   (should (equal "abc " (js2-current-token-string)))
 863   (should (eq js2-NAME (js2-next-token)))
 864   (should (eq js2-RC (js2-next-token)))
 865   (should (eq js2-TEMPLATE_HEAD (js2-next-token 'TEMPLATE_TAIL)))
 866   (should (equal " z " (js2-current-token-string)))
 867   (should (eq js2-NAME (js2-next-token)))
 868   (should (eq js2-RC (js2-next-token)))
 869   (should (eq js2-NO_SUBS_TEMPLATE (js2-next-token 'TEMPLATE_TAIL)))
 870   (should (equal " def" (js2-current-token-string))))
 871
 872 ;;; Error handling
 873
 874 (js2-deftest for-node-with-error-len "for "
 875   (js2-mode)
 876   (let ((node (js2-node-at-point (point-min))))
 877     (should (= (js2-node-len (js2-node-parent node)) 4))))
 878
 879 (js2-deftest function-without-parens-error "function b {}"
 880   ;; Should finish the parse.
 881   (js2-mode))
 882
 883 ;;; Comments
 884
 885 (js2-deftest comment-node-length "//"
 886   (js2-mode)
 887   (let ((node (js2-node-at-point (point-min))))
 888     (should (= (js2-node-len node) 2))))
 889
 890 (js2-deftest comment-node-length-newline "//\n"
 891   (js2-mode)
 892   (let ((node (js2-node-at-point (point-min))))
 893     (should (= (js2-node-len node) 3))))
 894
 895 ;;; Variables classification
 896
 897 (defun js2--variables-summary (vars)
 898   (let (r)
 899     (setq vars (let (aslist)
 900                  (maphash (lambda (k v) (push (cons k v) aslist)) vars)
 901                  aslist))
 902     (dolist (v (sort vars (lambda (a b) (< (js2-node-abs-pos (js2-symbol-ast-node (car a)))
 903                                       (js2-node-abs-pos (js2-symbol-ast-node (car b)))))))
 904       (let* ((symbol (car v))
 905              (inition (cadr v))
 906              (uses (cddr v))
 907              (symn (js2-symbol-ast-node symbol))
 908              (namen (js2--get-name-node symn)))
 909         (push (format "%s@%s:%s"
 910                       (js2-symbol-name symbol)
 911                       (js2-node-abs-pos namen)
 912                       (if (eq inition ?P)
 913                           "P"
 914                         (if uses
 915                             (if inition "I" "N")
 916                           "U"))) r)
 917         (dolist (u (sort (cddr v) (lambda (a b) (< (js2-node-abs-pos a)
 918                                               (js2-node-abs-pos b)))))
 919           (push (js2-node-abs-pos u) r))))
 920     (reverse r)))
 921
 922 (defmacro js2-deftest-classify-variables (name buffer-contents summary)
 923  (declare (indent defun))
 924   `(ert-deftest ,(intern (format "js2-classify-variables-%s" name)) ()
 925      (with-temp-buffer
 926        (save-excursion
 927          (insert ,buffer-contents))
 928        (unwind-protect
 929            (progn
 930              (js2-mode)
 931              (should (equal ,summary (js2--variables-summary
 932                                       (js2--classify-variables)))))
 933          (fundamental-mode)))))
 934
 935 (js2-deftest-classify-variables incomplete-var-statement
 936   "var"
 937   '())
 938
 939 (js2-deftest-classify-variables unused-variable
 940   "function foo () { var x; return 42; }"
 941   '("foo@10:U" "x@23:U"))
 942
 943 (js2-deftest-classify-variables unused-variable-declared-twice
 944   "function foo (a) { var x; function bar () { var x; x=42; }; return a;}"
 945   '("foo@10:U" "a@15:P" 68 "x@24:U" "bar@36:U" "x@49:U"))
 946
 947 (js2-deftest-classify-variables assigned-variable
 948   "function foo () { var x; x=42; return x; }"
 949   '("foo@10:U" "x@23:I" 39))
 950
 951 (js2-deftest-classify-variables assignment-in-nested-function
 952   "function foo () { var x; function bar () { x=42; }; }"
 953   '("foo@10:U" "x@23:U" "bar@35:U"))
 954
 955 (js2-deftest-classify-variables unused-nested-function
 956   "function foo() { var i, j=1; function bar() { var x, y=42, z=i; return y; } return i; }"
 957   '("foo@10:U" "i@22:N" 62 84 "j@25:U" "bar@39:U" "x@51:U" "y@54:I" 72 "z@60:U"))
 958
 959 (js2-deftest-classify-variables prop-get-initialized
 960   "function foo () { var x, y={}; y.a=x; }"
 961   '("foo@10:U" "x@23:N" 36 "y@26:I" 32))
 962
 963 (js2-deftest-classify-variables prop-get-uninitialized
 964   "function foo () { var x; if(x.foo) alert('boom'); }"
 965   '("foo@10:U" "x@23:N" 29))
 966
 967 (js2-deftest-classify-variables prop-get-function-assignment
 968   "(function(w) { w.f = function() { var a=42, m; return a; }; })(window);"
 969   '("w@11:P" 11 16 "a@39:I" 55 "m@45:U"))
 970
 971 (js2-deftest-classify-variables let-declaration
 972   "function foo () { let x,y=1; return x; }"
 973   '("foo@10:U" "x@23:N" 37 "y@25:U"))
 974
 975 (js2-deftest-classify-variables external-function-call
 976   "function foo (m) { console.log(m, arguments); }"
 977   '("foo@10:U" "m@15:P" 32))
 978
 979 (js2-deftest-classify-variables global-function-call
 980   "function bar () { return 42; } function foo (a) { return bar(); }"
 981   '("bar@10:I" 58 "foo@41:U" "a@46:P"))
 982
 983 (js2-deftest-classify-variables let-declaration-for-scope
 984   "function foo () { for(let x=1,y; x<y; y++) {} }"
 985   '("foo@10:U" "x@27:I" 34 "y@31:N" 36 39))
 986
 987 (js2-deftest-classify-variables arguments-implicit-var
 988   "function foo () { var p; for(p in arguments) { return p; } }"
 989   '("foo@10:U" "p@23:I" 55))
 990
 991 (js2-deftest-classify-variables catch-error-variable
 992   "function foo () { try { throw 'Foo'; } catch (e) { console.log(e); }"
 993   '("foo@10:U" "e@47:I" 64))
 994
 995 (js2-deftest-classify-variables prop-get-assignment
 996   "function foo () { var x={y:{z:{}}}; x.y.z=42; }"
 997   '("foo@10:U" "x@23:I" 37))
 998
 999 (js2-deftest-classify-variables unused-function-argument
1000   "function foo (a) { return 42; }"
1001   '("foo@10:U" "a@15:P"))
1002
1003 (js2-deftest-classify-variables used-function-argument
1004   "function foo (a) { a=42; return a; }"
1005   '("foo@10:U" "a@15:P" 33))
1006
1007 (js2-deftest-classify-variables prop-get
1008   "function foo (a) { a=navigator.x||navigator.y; return a; }"
1009   '("foo@10:U" "a@15:P" 55))
1010
1011 (js2-deftest-classify-variables for-in-loop
1012   "function foo () { var d={}; for(var k in d) {var v=d[k]; } }"
1013   '("foo@10:U" "d@23:I" 42 52 "k@37:I" 54 "v@50:U"))
1014
1015 (js2-deftest-classify-variables array-comprehension-legacy
1016   "function foo() { var j,a=[for (i of [1,2,3]) i*j]; }"
1017   '("foo@10:U" "j@22:N" 48 "a@24:U" "i@32:I" 46))
1018
1019 (js2-deftest-classify-variables array-comprehension
1020   "function foo() { var j,a=[[i,j] for (i of [1,2,3])]; }"
1021   '("foo@10:U" "j@22:N" 30 "a@24:U" "i@38:I" 28))
1022
1023 (js2-deftest-classify-variables return-named-function
1024   "function foo() { var a=42; return function bar() { return a; } }"
1025   '("foo@10:U" "a@22:I" 59 "bar@44:I" 44))
1026
1027 (js2-deftest-classify-variables named-wrapper-function
1028   "function foo() { var a; (function bar() { a=42; })(); return a; }"
1029   '("foo@10:U" "a@22:I" 62 "bar@35:I" 35))