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) (cl-first 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 ;;; Function definition
 202
 203 (js2-deftest function-redeclaring-var "var gen = 3; function gen() {};"
 204   (js2-mode)
 205   (should (= (length (js2-ast-root-warnings js2-mode-ast)) 1)))
 206
 207 (js2-deftest function-expression-var-same-name "var gen = function gen() {};"
 208   (js2-mode)
 209   (should (null (js2-ast-root-warnings js2-mode-ast))))
 210
 211 ;;; Function parameters
 212
 213 (js2-deftest-parse function-with-default-parameters
 214   "function foo(a = 1, b = a + 1) {\n}")
 215
 216 (js2-deftest-parse function-with-no-default-after-default
 217   "function foo(a = 1, b) {\n}"
 218   :syntax-error "b")
 219
 220 (js2-deftest-parse function-with-destruct-after-default
 221   "function foo(a = 1, {b, c}) {\n}"
 222   :syntax-error "{")
 223
 224 (js2-deftest-parse function-with-rest-parameter
 225   "function foo(a, b, ...rest) {\n}")
 226
 227 (js2-deftest-parse function-with-param-after-rest-parameter
 228   "function foo(a, ...b, rest) {\n}"
 229   :syntax-error "rest")
 230
 231 (js2-deftest-parse function-with-destruct-after-rest-parameter
 232   "function foo(a, ...b, {}) {\n}"
 233   :syntax-error "{}")
 234
 235 (js2-deftest-parse function-with-rest-after-default-parameter
 236   "function foo(a = 1, ...rest) {\n}")
 237
 238 ;;; Spread operator
 239
 240 (js2-deftest-parse spread-in-array-literal
 241   "[1, ...[2, 3], 4, ...[5, 6]];")
 242
 243 (js2-deftest-parse spread-in-function-call
 244   "f(3, ...[t(2), t(3)], 42, ...[t(4)]);")
 245
 246 ;;; Arrow functions
 247
 248 (js2-deftest-parse arrow-function-with-empty-args-and-no-curlies
 249   "() => false;" :reference "() => {false};")
 250
 251 (js2-deftest-parse arrow-function-with-args-and-curlies
 252   "(a, b = 1, ...c) => {  c;\n};")
 253
 254 (js2-deftest-parse arrow-function-with-destructuring
 255   "([{a}, b]) => {  a + b;\n};")
 256
 257 (js2-deftest-parse parenless-arrow-function-prohibits-rest
 258   "...b => {b + 1;};" :syntax-error "=>" :errors-count 1)
 259
 260 (js2-deftest-parse parenless-arrow-function-prohibits-destructuring
 261   "[a, b] => {a + b;};" :syntax-error "=>" :errors-count 4)
 262
 263 ;;; Automatic semicolon insertion
 264
 265 (js2-deftest-parse no-auto-semi-insertion-after-if
 266   "if (true) {\n}")
 267
 268 (js2-deftest-parse auto-semi-insertion-after-function
 269   "a = function() {}" :reference "a = function() {};")
 270
 271 (js2-deftest-parse auto-semi-one-variable-per-line
 272   "x\ny" :reference "x;\ny;")
 273
 274 ;;; Labels
 275
 276 (js2-deftest-parse labeled-stmt-node
 277   "foo:\nbar:\nx = y + 1;")
 278
 279 (js2-deftest no-label-node-inside-expr "x = y:"
 280   (let (js2-parse-interruptable-p)
 281     (js2-mode))
 282   (let ((assignment (js2-expr-stmt-node-expr (car (js2-scope-kids js2-mode-ast)))))
 283     (should (js2-name-node-p (js2-assign-node-right assignment)))))
 284
 285 (js2-deftest-parse label-and-loops "for (; ; ) {
 286   loop:
 287   for (; ; ) {
 288     continue loop;
 289   }
 290 }")
 291
 292 ;;; Generators
 293
 294 (js2-deftest-parse legacy-generator "function foo() {\n  yield 1;\n}")
 295
 296 (js2-deftest-parse legacy-generator-cannot-return
 297   "function foo() {\n  yield 1;\n return 2;\n}" :syntax-error "return 2")
 298
 299 (js2-deftest-parse harmony-generator "function* bar() {\n  yield 2;\n  return 3;\n}")
 300
 301 (js2-deftest-parse harmony-generator-yield-star "(function*(a) {  yield* a;\n});")
 302
 303 ;;; Comprehensions
 304
 305 (js2-deftest-parse parse-legacy-array-comp-loop-with-filter
 306   "[a for (a in b) if (a == 2)];")
 307
 308 (js2-deftest-parse parse-array-comp-loop-with-filters
 309   "[for (a in b) if (a == 2) if (b != 10) a];")
 310
 311 (js2-deftest-parse parse-generator-comp-loop-with-filters
 312   "(for (x of y) if (x != 4) x);")
 313
 314 (js2-deftest-parse parse-array-comp-with-yield-is-ok
 315   "(function() {  return [for (x of []) yield x];\n});")
 316
 317 (js2-deftest-parse parse-generator-comp-with-yield-is-not-ok
 318   "(function() {  return (for (x of []) yield x);\n});"
 319   :syntax-error "yield")
 320
 321 (js2-deftest-parse parse-generator-comp-with-yield-inside-function-is-ok
 322   "(for (x of []) function*() {  yield x;\n});")
 323
 324 ;;; Async
 325
 326 (js2-deftest-parse async-function-statement
 327   "async function foo() {\n}")
 328
 329 (js2-deftest-parse async-function-statement-inside-block
 330   "if (true) {\n  async function foo() {\n  }\n}")
 331
 332 (js2-deftest-parse async-function-expression-statements-are-verboten
 333   "async function() {}" :syntax-error "(")
 334
 335 (js2-deftest-parse async-named-function-expression
 336   "a = async function b() {};")
 337
 338 (js2-deftest-parse async-arrow-function-expression
 339   "a = async (b) => {  b;\n};")
 340
 341 ;;; Await
 342
 343 (js2-deftest-parse await-is-ok "async function foo() {\n  await bar();\n}")
 344
 345 (js2-deftest-parse await-inside-assignment-is-ok
 346                    "async function foo() {\n  var result = await bar();\n}")
 347
 348 (js2-deftest-parse await-inside-array-is-ok
 349                    "async function foo() {\n  var results = [await bar(), await baz()];\n}")
 350
 351 (js2-deftest-parse await-inside-non-async-function-is-not-ok
 352                    "function foo() {\n  await bar();\n}"
 353                    :syntax-error "await")
 354
 355 (js2-deftest-parse await-inside-non-async-arrow-function-is-not-ok
 356                    "a = () => {  await bar();\n}"
 357                    :syntax-error "await")
 358
 359 ;;; 'async' and 'await' are contextual keywords
 360
 361 (js2-deftest-parse async-can-be-var-name
 362   "var async = 3;")
 363
 364 (js2-deftest-parse async-can-be-function-name
 365   "function async() {\n}")
 366
 367 (js2-deftest-parse await-can-be-var-name
 368   "var await = 3;")
 369
 370 (js2-deftest-parse await-can-be-function-name
 371   "function await() {\n}")
 372
 373 ;;; Numbers
 374
 375 (js2-deftest-parse decimal-starting-with-zero "081;" :reference "81;")
 376
 377 (js2-deftest-parse huge-hex "0x0123456789abcdefABCDEF;" :reference "-1;")
 378
 379 (js2-deftest-parse octal-without-o "071;" :reference "57;")
 380
 381 (js2-deftest-parse hex-number-okay "0x123;" :reference "291;")
 382
 383 (js2-deftest-parse hex-number-broken "0xz23;"
 384   :syntax-error "0xz" :errors-count 2)
 385
 386 (js2-deftest-parse binary-number-okay "0b101;" :reference "5;")
 387
 388 (js2-deftest-parse binary-number-broken "0b210;"
 389   :syntax-error "0b2" :errors-count 2)
 390
 391 (js2-deftest-parse octal-number-okay "0o765;" :reference "501;")
 392
 393 (js2-deftest-parse octal-number-broken "0o812;"
 394   :syntax-error "0o8" :errors-count 2)
 395
 396 ;;; Modules
 397
 398 (js2-deftest parse-export-bindings "{one, two as dos}"
 399   (js2-init-scanner)
 400   (should (js2-match-token js2-LC))
 401   (let ((imports (js2-parse-export-bindings)))
 402     (should (not (equal nil imports)))
 403     (should (= 2 (length imports)))
 404     (let ((first (nth 0 imports))
 405           (second (nth 1 imports)))
 406       (should (equal "one" (js2-name-node-name (js2-export-binding-node-extern-name first))))
 407       (should (equal "two" (js2-name-node-name (js2-export-binding-node-extern-name second))))
 408       (let ((first-name (js2-export-binding-node-local-name first))
 409             (second-name (js2-export-binding-node-local-name second)))
 410         (should (equal first (js2-node-parent first-name)))
 411         (should (equal 3 (js2-node-len first-name)))
 412         (should (equal "one" (js2-name-node-name first-name)))
 413         (should (equal second (js2-node-parent second-name)))
 414         (should (equal 3 (js2-node-len second-name)))
 415         (should (equal "dos" (js2-name-node-name second-name)))))))
 416
 417 (js2-deftest parse-export-binding-as-default "one as default"
 418   (js2-init-scanner)
 419   (let ((binding (js2-maybe-parse-export-binding)))
 420     (should binding)
 421     (should (js2-export-binding-node-p binding))
 422     (let ((name (js2-export-binding-node-local-name binding)))
 423       (should name)
 424       (should (equal "default" (js2-name-node-name name))))))
 425
 426 (js2-deftest parse-namepsace-import "* as lib;"
 427   (js2-init-scanner)
 428   (should (js2-match-token js2-MUL))
 429   (let ((namespace-import (js2-parse-namespace-import)))
 430     (should (not (equal nil namespace-import)))
 431     (should (js2-namespace-import-node-p namespace-import))
 432     (should (= 1 (js2-node-pos namespace-import)))
 433     (should (equal 8 (js2-node-len namespace-import)))
 434     (let ((name-node (js2-namespace-import-node-name namespace-import)))
 435       (should (equal "lib" (js2-name-node-name name-node)))
 436       (should (= 5 (js2-node-pos name-node))))))
 437
 438 (js2-deftest parse-from-clause "from 'foo/bar';"
 439   (js2-init-scanner)
 440   (let ((from (js2-parse-from-clause)))
 441     (should (not (equal nil from)))
 442     (should (= 1 (js2-node-pos from)))
 443     (should (= 14 (js2-node-len from)))
 444     (should (equal "foo/bar" (js2-from-clause-node-module-id from)))))
 445
 446 (js2-deftest parse-import-module-id-only "import 'src/lib'"
 447   (js2-init-scanner)
 448   (should (js2-match-token js2-IMPORT))
 449   (let ((import (js2-parse-import)))
 450     (should (not (equal nil import)))
 451     (should (= 1 (js2-node-pos import)))
 452     (should (= 16 (js2-node-len import)))
 453     (should (equal nil (js2-import-node-import import)))
 454     (should (equal nil (js2-import-node-from import)))))
 455
 456 (js2-deftest parse-imported-default-binding "import theDefault from 'src/lib'"
 457   (js2-push-scope (make-js2-scope :pos 0))
 458   (js2-init-scanner)
 459   (should (js2-match-token js2-IMPORT))
 460   (let ((import-node (js2-parse-import)))
 461     (should (not (equal nil import-node)))
 462     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 463     (let ((import (js2-import-node-import import-node)))
 464       (should (not (equal nil import)))
 465       (should (equal nil (js2-import-clause-node-namespace-import import)))
 466       (should (equal nil (js2-import-clause-node-named-imports import)))
 467       (let ((default (js2-import-clause-node-default-binding import)))
 468         (should (not (equal nil default)))
 469         (should (js2-export-binding-node-p default))
 470         (should (equal "theDefault" (js2-name-node-name (js2-export-binding-node-extern-name default)))))))
 471   (should (js2-scope-get-symbol js2-current-scope "theDefault")))
 472
 473 (js2-deftest parse-import-namespace-binding "import * as lib from 'src/lib'"
 474   (js2-push-scope (make-js2-scope :pos 0))
 475   (js2-init-scanner)
 476   (should (js2-match-token js2-IMPORT))
 477   (let ((import-node (js2-parse-import)))
 478     (should (not (equal nil import-node)))
 479     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 480     (let ((import (js2-import-node-import import-node)))
 481       (should (not (equal nil import)))
 482       (should (equal nil (js2-import-clause-node-default-binding import)))
 483       (should (equal nil (js2-import-clause-node-named-imports import)))
 484       (let ((ns-import (js2-import-clause-node-namespace-import import)))
 485         (should (not (equal nil ns-import)))
 486         (should (js2-namespace-import-node-p ns-import))
 487         (should (equal "lib" (js2-name-node-name (js2-namespace-import-node-name ns-import)))))))
 488   (should (js2-scope-get-symbol js2-current-scope "lib")))
 489
 490 (js2-deftest parse-import-named-imports "import {foo as bar, baz} from 'src/lib'"
 491   (js2-push-scope (make-js2-scope :pos 0))
 492   (js2-init-scanner)
 493   (should (js2-match-token js2-IMPORT))
 494   (let ((import-node (js2-parse-import)))
 495     (should (not (equal nil import-node)))
 496     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 497     (let ((import (js2-import-node-import import-node)))
 498       (should (not (equal nil import)))
 499       (should (equal nil (js2-import-clause-node-default-binding import)))
 500       (should (equal nil (js2-import-clause-node-namespace-import import)))
 501       (let ((named-imports (js2-import-clause-node-named-imports import)))
 502         (should (not (equal nil named-imports)))
 503         (should (listp named-imports))
 504         (should (= 2 (length named-imports)))
 505         (let ((first (nth 0 named-imports))
 506               (second (nth 1 named-imports)))
 507           (should (equal "bar" (js2-name-node-name (js2-export-binding-node-local-name first))))
 508           (should (equal "baz" (js2-name-node-name (js2-export-binding-node-local-name second))))))))
 509   (should (js2-scope-get-symbol js2-current-scope "bar"))
 510   (should (js2-scope-get-symbol js2-current-scope "baz")))
 511
 512 (js2-deftest parse-import-default-and-namespace "import stuff, * as lib from 'src/lib'"
 513   (js2-push-scope (make-js2-scope :pos 0))
 514   (js2-init-scanner)
 515   (should (js2-match-token js2-IMPORT))
 516   (let ((import-node (js2-parse-import)))
 517     (should (not (equal nil import-node)))
 518     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 519     (let ((import (js2-import-node-import import-node)))
 520       (should (not (equal nil import)))
 521       (should (equal nil (js2-import-clause-node-named-imports import)))
 522       (let ((default (js2-import-clause-node-default-binding import))
 523             (ns-import (js2-import-clause-node-namespace-import import)))
 524         (should (not (equal nil default)))
 525         (should (equal "stuff" (js2-name-node-name (js2-export-binding-node-local-name default))))
 526         (should (not (equal nil ns-import)))
 527         (should (js2-namespace-import-node-p ns-import))
 528         (should (equal "lib" (js2-name-node-name (js2-namespace-import-node-name ns-import)))))))
 529   (should (js2-scope-get-symbol js2-current-scope "stuff"))
 530   (should (js2-scope-get-symbol js2-current-scope "lib")))
 531
 532 (js2-deftest parse-import-default-and-named-imports
 533   "import robert as bob, {cookies, pi as PIE} from 'src/lib'"
 534   (js2-push-scope (make-js2-scope :pos 0))
 535   (js2-init-scanner)
 536   (should (js2-match-token js2-IMPORT))
 537   (let ((import-node (js2-parse-import)))
 538     (should (not (equal nil import-node)))
 539     (should (equal "src/lib" (js2-import-node-module-id import-node)))
 540     (let ((import (js2-import-node-import import-node)))
 541       (should (not (equal nil import)))
 542       (should (not (equal nil (js2-import-clause-node-named-imports import))))
 543       (let ((default (js2-import-clause-node-default-binding import))
 544             (named-imports (js2-import-clause-node-named-imports import)))
 545         (should (not (equal nil default)))
 546         (should (equal "bob" (js2-name-node-name (js2-export-binding-node-local-name default))))
 547         (should (not (equal nil named-imports)))
 548         (should (= 2 (length named-imports))))))
 549   (should (js2-scope-get-symbol js2-current-scope "bob"))
 550   (should (js2-scope-get-symbol js2-current-scope "cookies"))
 551   (should (js2-scope-get-symbol js2-current-scope "PIE")))
 552
 553 (js2-deftest parse-this-module-in-from-clause "import {url} from this module;"
 554   (js2-push-scope (make-js2-scope :pos 0))
 555   (js2-init-scanner)
 556   (should (js2-match-token js2-IMPORT))
 557   (let ((import-node (js2-parse-import)))
 558     (should import-node)
 559     (let ((from-clause (js2-import-node-from import-node)))
 560       (should from-clause)
 561       (should (equal "this" (js2-from-clause-node-module-id from-clause)))
 562       (should (js2-from-clause-node-metadata-p from-clause)))))
 563
 564 (js2-deftest-parse import-only-for-side-effects "import 'src/lib';")
 565 (js2-deftest-parse import-default-only "import theDefault from 'src/lib';")
 566 (js2-deftest-parse import-named-only "import {one, two} from 'src/lib';")
 567 (js2-deftest-parse import-default-and-named "import theDefault, {one, two} from 'src/lib';")
 568 (js2-deftest-parse import-renaming-default "import * as lib from 'src/mylib';")
 569 (js2-deftest-parse import-renaming-named "import {one as uno, two as dos} from 'src/lib';")
 570 (js2-deftest-parse import-default-and-namespace "import robert as bob, * as lib from 'src/lib';")
 571 (js2-deftest-parse import-from-this-module "import {url} from this module;")
 572
 573 ;; Module Exports
 574
 575 (js2-deftest export-rexport "export * from 'other/lib'"
 576   (js2-init-scanner)
 577   (should (js2-match-token js2-EXPORT))
 578   (let ((export-node (js2-parse-export)))
 579     (should export-node)
 580     (should (js2-export-node-from-clause export-node))))
 581
 582 (js2-deftest export-export-named-list "export {foo, bar as bang};"
 583   (js2-init-scanner)
 584   (should (js2-match-token js2-EXPORT))
 585   (let ((export-node (js2-parse-export)))
 586     (should export-node)
 587     (let ((exports (js2-export-node-exports-list export-node)))
 588       (should exports)
 589       (should (= 2 (length exports))))))
 590
 591 (js2-deftest re-export-named-list "export {foo, bar as bang} from 'other/lib'"
 592   (js2-init-scanner)
 593   (should (js2-match-token js2-EXPORT))
 594   (let ((export-node (js2-parse-export)))
 595     (should export-node)
 596     (should (js2-export-node-from-clause export-node))
 597     (let ((exports (js2-export-node-exports-list export-node)))
 598       (should exports)
 599       (should (= 2 (length exports))))))
 600
 601 (js2-deftest export-variable-statement "export var foo = 'bar', baz = 'bang';"
 602   (js2-init-scanner)
 603   (js2-push-scope (make-js2-scope :pos 0))
 604   (should (js2-match-token js2-EXPORT))
 605   (let ((export-node (js2-parse-export)))
 606     (should export-node)
 607     (should (js2-export-node-declaration export-node))))
 608
 609 (js2-deftest export-const-declaration "export const PI = Math.PI;"
 610   (js2-init-scanner)
 611   (js2-push-scope (make-js2-scope :pos 0))
 612   (should (js2-match-token js2-EXPORT))
 613   (let ((export-node (js2-parse-export)))
 614     (should export-node)
 615     (should (js2-export-node-declaration export-node))))
 616
 617 (js2-deftest export-let-declaration "export let foo = [1];"
 618   (js2-init-scanner)
 619   (js2-push-scope (make-js2-scope :pos 0))
 620   (should (js2-match-token js2-EXPORT))
 621   (let ((export-node (js2-parse-export)))
 622     (should export-node)
 623     (should (js2-var-decl-node-p (js2-export-node-declaration export-node)))))
 624
 625 (js2-deftest export-class-declaration "export class Foo {};"
 626   (js2-init-scanner)
 627   (js2-push-scope (make-js2-scope :pos 0))
 628   (should (js2-match-token js2-EXPORT))
 629   (let ((export-node (js2-parse-export)))
 630     (should export-node)
 631     (should (js2-class-node-p (js2-export-node-declaration export-node)))))
 632
 633 (js2-deftest export-function-declaration "export default function doStuff() {};"
 634   (js2-init-scanner)
 635   (js2-push-scope (make-js2-scope :pos 0))
 636   (should (js2-match-token js2-EXPORT))
 637   (let ((export-node (js2-parse-export)))
 638     (should export-node)
 639     (should (js2-export-node-default export-node))))
 640
 641 (js2-deftest export-generator-declaration "export default function* one() {};"
 642   (js2-init-scanner)
 643   (js2-push-scope (make-js2-scope :pos 0))
 644   (should (js2-match-token js2-EXPORT))
 645   (let ((export-node (js2-parse-export)))
 646     (should export-node)
 647     (should (js2-export-node-default export-node))))
 648
 649 (js2-deftest export-assignment-expression "export default a = b;"
 650   (js2-init-scanner)
 651   (js2-push-scope (make-js2-scope :pos 0))
 652   (should (js2-match-token js2-EXPORT))
 653   (let ((export-node (js2-parse-export)))
 654     (should export-node)
 655     (should (js2-export-node-default export-node))))
 656
 657 (js2-deftest-parse parse-export-rexport "export * from 'other/lib';")
 658 (js2-deftest-parse parse-export-export-named-list "export {foo, bar as bang};")
 659 (js2-deftest-parse parse-re-export-named-list "export {foo, bar as bang} from 'other/lib';")
 660 (js2-deftest-parse parse-export-const-declaration "export const PI = Math.PI;")
 661 (js2-deftest-parse parse-export-let-declaration "export let foo = [1];")
 662 (js2-deftest-parse parse-export-function-declaration "export default function doStuff() {};")
 663 (js2-deftest-parse parse-export-generator-declaration "export default function* one() {};")
 664 (js2-deftest-parse parse-export-assignment-expression "export default a = b;")
 665
 666 ;;; Strings
 667
 668 (js2-deftest-parse string-literal
 669   "var x = 'y';")
 670
 671 (js2-deftest-parse object-get-string-literal
 672   "var x = {y: 5};\nvar z = x[\"y\"];")
 673
 674 (js2-deftest-parse template-no-substritutions
 675   "var x = `abc
 676             def`, y = `\\u0000`;")
 677
 678 (js2-deftest-parse template-with-substitutions
 679   "var y = `${a + b} ${d + e + f}`;")
 680
 681 (js2-deftest-parse tagged-template
 682   "foo.args`${++x, \"o\"}k`;")
 683
 684 ;;; Classes
 685
 686 (js2-deftest-parse parse-harmony-class-statement
 687   "class Foo {\n  get bar() {  return 42;\n}\n  set bar(x) {  y = x;\n}\n}")
 688
 689 (js2-deftest-parse parse-harmony-class-statement-without-name-is-not-ok
 690   "class {\n  get bar() {  return 42;\n}\n}"
 691   :syntax-error "{")
 692
 693 (js2-deftest-parse parse-harmony-class-expression
 694   "var Foo1 = class Foo {\n  bar() {  return 42;\n}\n};")
 695
 696 (js2-deftest-parse parse-harmony-anonymous-class-expression
 697   "var Foo = class {\n  set bar(x) {  bar = x;\n}\n};")
 698
 699 (js2-deftest-parse parse-harmony-class-with-extends
 700   "class Foo extends Bar {\n}")
 701
 702 (js2-deftest-parse parse-harmony-anonymous-class-with-extends
 703   "foo.Foo = class extends Bar {\n  set bar(x) {  bar = x;\n}\n};")
 704
 705 (js2-deftest-parse parse-harmony-class-with-complex-extends
 706   "class Foo extends foo[BAR][2].Baz {\n}")
 707
 708 (js2-deftest-parse parse-harmony-class-missing-extended-class-is-not-ok
 709   "class Foo extends {\n}"
 710   :syntax-error "extends")
 711
 712 (js2-deftest-parse parse-harmony-class-static-method
 713   "class Foo extends Bar {\n  static bar() {  return 42;\n}\n}")
 714
 715 (js2-deftest-parse parse-unterminated-class-is-not-okay
 716   "class Foo {\n  get bar() {  return 42;\n}"
 717   :syntax-error "}")
 718
 719 (js2-deftest-parse parse-super-keyword
 720   "class Foo {\n  constructor() {  super(42);\n}\n  foo() {  super.foo();\n}\n}")
 721
 722 ;;; Scopes
 723
 724 (js2-deftest ast-symbol-table-includes-fn-node "function foo() {}"
 725   (js2-mode)
 726   (let ((entry (js2-scope-get-symbol js2-mode-ast 'foo)))
 727     (should (= (js2-symbol-decl-type entry) js2-FUNCTION))
 728     (should (equal (js2-symbol-name entry) "foo"))
 729     (should (js2-function-node-p (js2-symbol-ast-node entry)))))
 730
 731 (js2-deftest fn-symbol-table-includes-nested-fn "function foo() {
 732   function bar() {}
 733   var x;
 734 }"
 735   (js2-mode)
 736   (let* ((scope (js2-node-at-point (point-min)))
 737          (fn-entry (js2-scope-get-symbol scope 'bar))
 738          (var-entry (js2-scope-get-symbol scope 'x)))
 739     (should (string= (js2-name-node-name (js2-function-node-name scope)) "foo"))
 740     (should (= (js2-symbol-decl-type fn-entry) js2-FUNCTION))
 741     (should (js2-function-node-p (js2-symbol-ast-node fn-entry)))
 742     (should (= (js2-symbol-decl-type var-entry) js2-VAR))
 743     (should (js2-name-node-p (js2-symbol-ast-node var-entry)))))
 744
 745 ;;; Tokenizer
 746
 747 (js2-deftest get-token "(1+1)"
 748   (js2-init-scanner)
 749   (should (eq js2-LP (js2-next-token)))
 750   (should (eq js2-NUMBER (js2-next-token)))
 751   (should (eq js2-ADD (js2-next-token)))
 752   (should (eq js2-NUMBER (js2-next-token)))
 753   (should (eq js2-RP (js2-next-token))))
 754
 755 (js2-deftest unget-token "()"
 756   (js2-init-scanner)
 757   (should (eq js2-LP (js2-next-token)))
 758   (js2-unget-token)
 759   (should (eq js2-LP (js2-next-token)))
 760   (should (eq js2-RP (js2-next-token))))
 761
 762 (js2-deftest get-token-or-eol "x\n++;"
 763   (js2-init-scanner)
 764   (should (eq js2-NAME (js2-next-token)))
 765   (should (eq js2-EOL (js2-peek-token-or-eol)))
 766   (should (eq js2-INC (js2-next-token)))
 767   (should (eq js2-SEMI (js2-peek-token-or-eol))))
 768
 769 (js2-deftest unget-token-over-eol-and-comment "x\n//abc\ny"
 770   (js2-init-scanner)
 771   (should (eq js2-NAME (js2-next-token)))
 772   (should (eq js2-NAME (js2-next-token)))
 773   (should (equal "y" (js2-current-token-string)))
 774   (js2-unget-token)
 775   (should (eq js2-NAME (js2-current-token-type)))
 776   (should (equal "x" (js2-current-token-string))))
 777
 778 (js2-deftest ts-seek "(1+2)"
 779   (js2-init-scanner)
 780   (should (eq js2-LP (js2-next-token)))
 781   (should (eq js2-NUMBER (js2-next-token)))
 782   (js2-unget-token)
 783   (let ((state (make-js2-ts-state)))
 784     (should (eq js2-NUMBER (js2-next-token)))
 785     (should (eq js2-ADD (js2-next-token)))
 786     (js2-ts-seek state)
 787     (should (eq 1 js2-ti-lookahead))
 788     (should (eq js2-NUMBER (js2-next-token)))
 789     (should (eq 1 (js2-token-number
 790                    (js2-current-token))))))
 791
 792 (js2-deftest get-token-template-literal "`abc ${i} z ${j} def`"
 793   (js2-init-scanner)
 794   (should (eq js2-TEMPLATE_HEAD (js2-next-token)))
 795   (should (equal "abc " (js2-current-token-string)))
 796   (should (eq js2-NAME (js2-next-token)))
 797   (should (eq js2-RC (js2-next-token)))
 798   (should (eq js2-TEMPLATE_HEAD (js2-next-token 'TEMPLATE_TAIL)))
 799   (should (equal " z " (js2-current-token-string)))
 800   (should (eq js2-NAME (js2-next-token)))
 801   (should (eq js2-RC (js2-next-token)))
 802   (should (eq js2-NO_SUBS_TEMPLATE (js2-next-token 'TEMPLATE_TAIL)))
 803   (should (equal " def" (js2-current-token-string))))
 804
 805 ;;; Error handling
 806
 807 (js2-deftest for-node-with-error-len "for "
 808   (js2-mode)
 809   (let ((node (js2-node-at-point (point-min))))
 810     (should (= (js2-node-len (js2-node-parent node)) 4))))
 811
 812 (js2-deftest function-without-parens-error "function b {}"
 813   ;; Should finish the parse.
 814   (js2-mode))