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
  26 (defmacro js2-deftest (name buffer-contents &rest body)
  27   `(ert-deftest ,(intern (format "js2-%s" name)) ()
  28      (with-temp-buffer
  29        (save-excursion
  30          (insert ,buffer-contents))
  31        (unwind-protect
  32            (progn
  33              ,@body)
  34          (fundamental-mode)))))
  35
  36 (put 'js2-deftest 'lisp-indent-function 'defun)
  37
  38 (defun js2-test-string-to-ast (s)
  39   (ert-with-test-buffer (:name 'origin)
  40     (insert s)
  41     (js2-mode)
  42     (should (null js2-mode-buffer-dirty-p))
  43     js2-mode-ast))
  44
  45 (defun* js2-test-parse-string (code-string &key syntax-error errors-count
  46                                                 reference)
  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           (destructuring-bind (_ pos len) (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 (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   `(ert-deftest ,(intern (format "js2-%s" name)) ()
  71      (let ,(append bind '((js2-basic-offset 2)))
  72        (js2-test-parse-string ,code-string
  73                               :syntax-error ,syntax-error
  74                               :errors-count ,errors-count
  75                               :reference ,reference))))
  76
  77 (put 'js2-deftest-parse 'lisp-indent-function 'defun)
  78
  79 ;;; Basics
  80
  81 (js2-deftest-parse variable-assignment
  82   "a = 1;")
  83
  84 (js2-deftest-parse empty-object-literal
  85   "b = {};")
  86
  87 (js2-deftest-parse empty-array-literal
  88   "c = [];")
  89
  90 (js2-deftest-parse array-with-missing-elements
  91   "var a = [1, 2, ,];")
  92
  93 (js2-deftest-parse comma-after-regexp
  94   "d = /eee/, 42;")
  95
  96 (js2-deftest-parse return-statement
  97   "function foo() {\n  return 2;\n}")
  98
  99 (js2-deftest-parse function-statement
 100   "function foo() {\n}")
 101
 102 (js2-deftest-parse function-statement-inside-block
 103   "if (true) {\n  function foo() {\n  }\n}")
 104
 105 (js2-deftest-parse function-expression-statements-are-verboten
 106   "function() {}" :syntax-error "(")
 107
 108 (js2-deftest-parse member-expr-as-function-name
 109   "function a.b.c[2](x, y) {\n}"
 110   :bind ((js2-allow-member-expr-as-function-name t)))
 111
 112 (js2-deftest-parse named-function-expression
 113   "a = function b() {};")
 114
 115 (js2-deftest-parse parenthesized-expression
 116   "(1 + 2);")
 117
 118 (js2-deftest-parse for-with-in-operator-in-parens
 119   "for (var y = (0 in []) in {}) {\n}")
 120
 121 (js2-deftest-parse for-with-in-operator-in-cond
 122   "for (var y = 1 ? 0 in [] : false in {}) {\n}")
 123
 124 (js2-deftest-parse let-expression
 125   "(let (x = 42) x);")
 126
 127 (js2-deftest-parse let-expression-statement
 128   "let (x = 42) x;")
 129
 130 ;;; Callers of `js2-valid-prop-name-token'
 131
 132 (js2-deftest-parse parse-property-access-when-not-keyword
 133   "A.foo = 3;")
 134
 135 (js2-deftest-parse parse-property-access-when-keyword
 136   "A.in = 3;"
 137   :bind ((js2-allow-keywords-as-property-names t)))
 138
 139 (js2-deftest-parse parse-property-access-when-keyword-no-xml
 140   "A.in = 3;"
 141   :bind ((js2-allow-keywords-as-property-names t)
 142          (js2-compiler-xml-available nil)))
 143
 144 (js2-deftest-parse parse-object-literal-when-not-keyword
 145   "a = {b: 1};")
 146
 147 (js2-deftest-parse parse-object-literal-when-keyword
 148   "a = {in: 1};"
 149   :bind ((js2-allow-keywords-as-property-names t)))
 150
 151 ;;; 'of' contextual keyword
 152
 153 (js2-deftest-parse parse-legacy-array-comp-loop-with-of
 154   "[a for (a of [])];")
 155
 156 (js2-deftest-parse parse-array-comp-loop
 157   "[for (a of []) a];")
 158
 159 (js2-deftest-parse parse-for-of
 160   "for (var a of []) {\n}")
 161
 162 (js2-deftest-parse of-can-be-var-name
 163   "var of = 3;")
 164
 165 (js2-deftest-parse of-can-be-function-name
 166   "function of() {\n}")
 167
 168 ;;; Destructuring binding
 169
 170 (js2-deftest-parse destruct-in-declaration
 171   "var {a, b} = {a: 1, b: 2};")
 172
 173 (js2-deftest-parse destruct-in-arguments
 174   "function f({a: aa, b: bb}) {\n}")
 175
 176 (js2-deftest-parse destruct-in-array-comp-loop
 177   "[a + b for ([a, b] in [[0, 1], [1, 2]])];")
 178
 179 (js2-deftest-parse destruct-in-catch-clause
 180   "try {\n} catch ({a, b}) {\n  a + b;\n}")
 181
 182 ;;; Function parameters
 183
 184 (js2-deftest-parse function-with-default-parameters
 185   "function foo(a = 1, b = a + 1) {\n}")
 186
 187 (js2-deftest-parse function-with-no-default-after-default
 188   "function foo(a = 1, b) {\n}"
 189   :syntax-error "b")
 190
 191 (js2-deftest-parse function-with-destruct-after-default
 192   "function foo(a = 1, {b, c}) {\n}"
 193   :syntax-error "{")
 194
 195 (js2-deftest-parse function-with-rest-parameter
 196   "function foo(a, b, ...rest) {\n}")
 197
 198 (js2-deftest-parse function-with-param-after-rest-parameter
 199   "function foo(a, ...b, rest) {\n}"
 200   :syntax-error "rest")
 201
 202 (js2-deftest-parse function-with-destruct-after-rest-parameter
 203   "function foo(a, ...b, {}) {\n}"
 204   :syntax-error "{}")
 205
 206 (js2-deftest-parse function-with-rest-after-default-parameter
 207   "function foo(a = 1, ...rest) {\n}")
 208
 209 ;;; Spread operator
 210
 211 (js2-deftest-parse spread-in-array-literal
 212   "[1, ...[2, 3], 4, ...[5, 6]];")
 213
 214 (js2-deftest-parse spread-in-function-call
 215   "f(3, ...[t(2), t(3)], 42, ...[t(4)]);")
 216
 217 ;;; Arrow functions
 218
 219 (js2-deftest-parse arrow-function-with-empty-args-and-no-curlies
 220   "() => false;" :reference "() => {false};")
 221
 222 (js2-deftest-parse arrow-function-with-args-and-curlies
 223   "(a, b = 1, ...c) => {  c;\n};")
 224
 225 (js2-deftest-parse arrow-function-with-destructuring
 226   "([{a}, b]) => {  a + b;\n};")
 227
 228 (js2-deftest-parse parenless-arrow-function-prohibits-rest
 229   "...b => {b + 1;};" :syntax-error "=>" :errors-count 1)
 230
 231 (js2-deftest-parse parenless-arrow-function-prohibits-destructuring
 232   "[a, b] => {a + b;};" :syntax-error "=>" :errors-count 4)
 233
 234 ;;; Automatic semicolon insertion
 235
 236 (js2-deftest-parse no-auto-semi-insertion-after-if
 237   "if (true) {\n}")
 238
 239 (js2-deftest-parse auto-semi-insertion-after-function
 240   "a = function() {}" :reference "a = function() {};")
 241
 242 (js2-deftest-parse auto-semi-one-variable-per-line
 243   "x\ny" :reference "x;\ny;")
 244
 245 ;;; Labels
 246
 247 (js2-deftest-parse labeled-stmt-node
 248   "foo:\nbar:\nx = y + 1;")
 249
 250 (js2-deftest no-label-node-inside-expr "x = y:"
 251   (let (js2-parse-interruptable-p)
 252     (js2-mode))
 253   (let ((assignment (js2-expr-stmt-node-expr (car (js2-scope-kids js2-mode-ast)))))
 254     (should (js2-name-node-p (js2-assign-node-right assignment)))))
 255
 256 (js2-deftest-parse label-and-loops "for (; ; ) {
 257   loop:
 258   for (; ; ) {
 259     continue loop;
 260   }
 261 }")
 262
 263 ;;; Generators
 264
 265 (js2-deftest-parse legacy-generator "function foo() {\n  yield 1;\n}")
 266
 267 (js2-deftest-parse legacy-generator-cannot-return
 268   "function foo() {\n  yield 1;\n return 2;\n}" :syntax-error "return 2")
 269
 270 (js2-deftest-parse harmony-generator "function* bar() {\n  yield 2;\n  return 3;\n}")
 271
 272 (js2-deftest-parse harmony-generator-yield-star "(function*(a) {  yield* a;\n});")
 273
 274 ;;; Comprehensions
 275
 276 (js2-deftest-parse parse-legacy-array-comp-loop-with-filter
 277   "[a for (a in b) if (a == 2)];")
 278
 279 (js2-deftest-parse parse-array-comp-loop-with-filters
 280   "[for (a in b) if (a == 2) if (b != 10) a];")
 281
 282 (js2-deftest-parse parse-generator-comp-loop-with-filters
 283   "(for (x of y) if (x != 4) x);")
 284
 285 (js2-deftest-parse parse-array-comp-with-yield-is-ok
 286   "(function() {  return [for (x of []) yield x];\n});")
 287
 288 (js2-deftest-parse parse-generator-comp-with-yield-is-not-ok
 289   "(function() {  return (for (x of []) yield x);\n});"
 290   :syntax-error "yield")
 291
 292 (js2-deftest-parse parse-generator-comp-with-yield-inside-function-is-ok
 293   "(for (x of []) function*() {  yield x;\n});")
 294
 295 ;;; Numbers
 296
 297 (js2-deftest-parse decimal-starting-with-zero "081;" :reference "81;")
 298
 299 (js2-deftest-parse huge-hex "0x0123456789abcdefABCDEF;" :reference "-1;")
 300
 301 (js2-deftest-parse octal-without-o "071;" :reference "57;")
 302
 303 (js2-deftest-parse hex-number-okay "0x123;" :reference "291;")
 304
 305 (js2-deftest-parse hex-number-broken "0xz23;"
 306   :syntax-error "0xz" :errors-count 2)
 307
 308 (js2-deftest-parse binary-number-okay "0b101;" :reference "5;")
 309
 310 (js2-deftest-parse binary-number-broken "0b210;"
 311   :syntax-error "0b2" :errors-count 2)
 312
 313 (js2-deftest-parse octal-number-okay "0o765;" :reference "501;")
 314
 315 (js2-deftest-parse octal-number-broken "0o812;"
 316   :syntax-error "0o8" :errors-count 2)
 317
 318 ;;; Scopes
 319
 320 (js2-deftest ast-symbol-table-includes-fn-node "function foo() {}"
 321   (js2-mode)
 322   (let ((entry (js2-scope-get-symbol js2-mode-ast 'foo)))
 323     (should (= (js2-symbol-decl-type entry) js2-FUNCTION))
 324     (should (equal (js2-symbol-name entry) "foo"))
 325     (should (js2-function-node-p (js2-symbol-ast-node entry)))))
 326
 327 (js2-deftest fn-symbol-table-includes-nested-fn "function foo() {
 328   function bar() {}
 329   var x;
 330 }"
 331   (js2-mode)
 332   (let* ((scope (js2-node-at-point (point-min)))
 333          (fn-entry (js2-scope-get-symbol scope 'bar))
 334          (var-entry (js2-scope-get-symbol scope 'x)))
 335     (should (string= (js2-name-node-name (js2-function-node-name scope)) "foo"))
 336     (should (= (js2-symbol-decl-type fn-entry) js2-FUNCTION))
 337     (should (js2-function-node-p (js2-symbol-ast-node fn-entry)))
 338     (should (= (js2-symbol-decl-type var-entry) js2-VAR))
 339     (should (js2-name-node-p (js2-symbol-ast-node var-entry)))))
 340
 341 ;;; Tokenizer
 342
 343 (js2-deftest get-token "(1+1)"
 344   (js2-init-scanner)
 345   (should (eq js2-LP (js2-next-token)))
 346   (should (eq js2-NUMBER (js2-next-token)))
 347   (should (eq js2-ADD (js2-next-token)))
 348   (should (eq js2-NUMBER (js2-next-token)))
 349   (should (eq js2-RP (js2-next-token))))
 350
 351 (js2-deftest unget-token "()"
 352   (js2-init-scanner)
 353   (should (eq js2-LP (js2-next-token)))
 354   (js2-unget-token)
 355   (should (eq js2-LP (js2-next-token)))
 356   (should (eq js2-RP (js2-next-token))))
 357
 358 (js2-deftest get-token-or-eol "x\n++;"
 359   (js2-init-scanner)
 360   (should (eq js2-NAME (js2-next-token)))
 361   (should (eq js2-EOL (js2-peek-token-or-eol)))
 362   (should (eq js2-INC (js2-next-token)))
 363   (should (eq js2-SEMI (js2-peek-token-or-eol))))
 364
 365 (js2-deftest unget-token-over-eol-and-comment "x\n//abc\ny"
 366   (js2-init-scanner)
 367   (should (eq js2-NAME (js2-next-token)))
 368   (should (eq js2-NAME (js2-next-token)))
 369   (should (equal "y" (js2-current-token-string)))
 370   (js2-unget-token)
 371   (should (eq js2-NAME (js2-current-token-type)))
 372   (should (equal "x" (js2-current-token-string))))
 373
 374 (js2-deftest ts-seek "(1+2)"
 375   (js2-init-scanner)
 376   (should (eq js2-LP (js2-next-token)))
 377   (should (eq js2-NUMBER (js2-next-token)))
 378   (js2-unget-token)
 379   (let ((state (make-js2-ts-state)))
 380     (should (eq js2-NUMBER (js2-next-token)))
 381     (should (eq js2-ADD (js2-next-token)))
 382     (js2-ts-seek state)
 383     (should (eq 1 js2-ti-lookahead))
 384     (should (eq js2-NUMBER (js2-next-token)))
 385     (should (eq 1 (js2-token-number
 386                    (js2-current-token))))))
 387
 388 ;;; Error handling
 389
 390 (js2-deftest for-node-with-error-len "for "
 391   (js2-mode)
 392   (let ((node (js2-node-at-point (point-min))))
 393     (should (= (js2-node-len (js2-node-parent node)) 4))))
 394
 395 (js2-deftest function-without-parens-error "function b {}"
 396   ;; Should finish the parse.
 397   (js2-mode))