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1"use strict";
2
3var _interopRequire = function (obj) { return obj && obj.__esModule ? obj["default"] : obj; };
4
5var _createClass = (function () { function defineProperties(target, props) { for (var key in props) { var prop = props[key]; prop.configurable = true; if (prop.value) prop.writable = true; } Object.defineProperties(target, props); } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();
6
7var _get = function get(object, property, receiver) { var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { return get(parent, property, receiver); } } else if ("value" in desc && desc.writable) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } };
8
9var _inherits = function (subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) subClass.__proto__ = superClass; };
10
11var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };
12
13/*
14 Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
15
16 Redistribution and use in source and binary forms, with or without
17 modification, are permitted provided that the following conditions are met:
18
19 * Redistributions of source code must retain the above copyright
20 notice, this list of conditions and the following disclaimer.
21 * Redistributions in binary form must reproduce the above copyright
22 notice, this list of conditions and the following disclaimer in the
23 documentation and/or other materials provided with the distribution.
24
25 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
29 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
30 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
31 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
32 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35*/
36
37var Syntax = require("estraverse").Syntax;
38
39var esrecurse = _interopRequire(require("esrecurse"));
40
41var Reference = _interopRequire(require("./reference"));
42
43var Variable = _interopRequire(require("./variable"));
44
45var PatternVisitor = _interopRequire(require("./pattern-visitor"));
46
47var _definition = require("./definition");
48
49var ParameterDefinition = _definition.ParameterDefinition;
50var Definition = _definition.Definition;
51
52var assert = _interopRequire(require("assert"));
53
54function traverseIdentifierInPattern(rootPattern, referencer, callback) {
55 // Call the callback at left hand identifier nodes, and Collect right hand nodes.
56 var visitor = new PatternVisitor(rootPattern, callback);
57 visitor.visit(rootPattern);
58
59 // Process the right hand nodes recursively.
60 if (referencer != null) {
61 visitor.rightHandNodes.forEach(referencer.visit, referencer);
62 }
63}
64
65// Importing ImportDeclaration.
66// http://people.mozilla.org/~jorendorff/es6-draft.html#sec-moduledeclarationinstantiation
67// https://github.com/estree/estree/blob/master/es6.md#importdeclaration
68// FIXME: Now, we don't create module environment, because the context is
69// implementation dependent.
70
71var Importer = (function (_esrecurse$Visitor) {
72 function Importer(declaration, referencer) {
73 _classCallCheck(this, Importer);
74
75 _get(Object.getPrototypeOf(Importer.prototype), "constructor", this).call(this);
76 this.declaration = declaration;
77 this.referencer = referencer;
78 }
79
80 _inherits(Importer, _esrecurse$Visitor);
81
82 _createClass(Importer, {
83 visitImport: {
84 value: function visitImport(id, specifier) {
85 var _this = this;
86
87 this.referencer.visitPattern(id, function (pattern) {
88 _this.referencer.currentScope().__define(pattern, new Definition(Variable.ImportBinding, pattern, specifier, _this.declaration, null, null));
89 });
90 }
91 },
92 ImportNamespaceSpecifier: {
93 value: function ImportNamespaceSpecifier(node) {
94 var local = node.local || node.id;
95 if (local) {
96 this.visitImport(local, node);
97 }
98 }
99 },
100 ImportDefaultSpecifier: {
101 value: function ImportDefaultSpecifier(node) {
102 var local = node.local || node.id;
103 this.visitImport(local, node);
104 }
105 },
106 ImportSpecifier: {
107 value: function ImportSpecifier(node) {
108 var local = node.local || node.id;
109 if (node.name) {
110 this.visitImport(node.name, node);
111 } else {
112 this.visitImport(local, node);
113 }
114 }
115 }
116 });
117
118 return Importer;
119})(esrecurse.Visitor);
120
121// Referencing variables and creating bindings.
122
123var Referencer = (function (_esrecurse$Visitor2) {
124 function Referencer(scopeManager) {
125 _classCallCheck(this, Referencer);
126
127 _get(Object.getPrototypeOf(Referencer.prototype), "constructor", this).call(this);
128 this.scopeManager = scopeManager;
129 this.parent = null;
130 this.isInnerMethodDefinition = false;
131 }
132
133 _inherits(Referencer, _esrecurse$Visitor2);
134
135 _createClass(Referencer, {
136 currentScope: {
137 value: function currentScope() {
138 return this.scopeManager.__currentScope;
139 }
140 },
141 close: {
142 value: function close(node) {
143 while (this.currentScope() && node === this.currentScope().block) {
144 this.scopeManager.__currentScope = this.currentScope().__close(this.scopeManager);
145 }
146 }
147 },
148 pushInnerMethodDefinition: {
149 value: function pushInnerMethodDefinition(isInnerMethodDefinition) {
150 var previous = this.isInnerMethodDefinition;
151 this.isInnerMethodDefinition = isInnerMethodDefinition;
152 return previous;
153 }
154 },
155 popInnerMethodDefinition: {
156 value: function popInnerMethodDefinition(isInnerMethodDefinition) {
157 this.isInnerMethodDefinition = isInnerMethodDefinition;
158 }
159 },
160 materializeTDZScope: {
161 value: function materializeTDZScope(node, iterationNode) {
162 // http://people.mozilla.org/~jorendorff/es6-draft.html#sec-runtime-semantics-forin-div-ofexpressionevaluation-abstract-operation
163 // TDZ scope hides the declaration's names.
164 this.scopeManager.__nestTDZScope(node, iterationNode);
165 this.visitVariableDeclaration(this.currentScope(), Variable.TDZ, iterationNode.left, 0, true);
166 }
167 },
168 materializeIterationScope: {
169 value: function materializeIterationScope(node) {
170 var _this = this;
171
172 // Generate iteration scope for upper ForIn/ForOf Statements.
173 var letOrConstDecl;
174 this.scopeManager.__nestForScope(node);
175 letOrConstDecl = node.left;
176 this.visitVariableDeclaration(this.currentScope(), Variable.Variable, letOrConstDecl, 0);
177 this.visitPattern(letOrConstDecl.declarations[0].id, function (pattern) {
178 _this.currentScope().__referencing(pattern, Reference.WRITE, node.right, null, true, true);
179 });
180 }
181 },
182 referencingDefaultValue: {
183 value: function referencingDefaultValue(pattern, assignments, maybeImplicitGlobal, init) {
184 var scope = this.currentScope();
185 assignments.forEach(function (assignment) {
186 scope.__referencing(pattern, Reference.WRITE, assignment.right, maybeImplicitGlobal, pattern !== assignment.left, init);
187 });
188 }
189 },
190 visitPattern: {
191 value: function visitPattern(node, options, callback) {
192 if (typeof options === "function") {
193 callback = options;
194 options = { processRightHandNodes: false };
195 }
196 traverseIdentifierInPattern(node, options.processRightHandNodes ? this : null, callback);
197 }
198 },
199 visitFunction: {
200 value: function visitFunction(node) {
201 var _this = this;
202
203 var i, iz;
204 // FunctionDeclaration name is defined in upper scope
205 // NOTE: Not referring variableScope. It is intended.
206 // Since
207 // in ES5, FunctionDeclaration should be in FunctionBody.
208 // in ES6, FunctionDeclaration should be block scoped.
209 if (node.type === Syntax.FunctionDeclaration) {
210 // id is defined in upper scope
211 this.currentScope().__define(node.id, new Definition(Variable.FunctionName, node.id, node, null, null, null));
212 }
213
214 // FunctionExpression with name creates its special scope;
215 // FunctionExpressionNameScope.
216 if (node.type === Syntax.FunctionExpression && node.id) {
217 this.scopeManager.__nestFunctionExpressionNameScope(node);
218 }
219
220 // Consider this function is in the MethodDefinition.
221 this.scopeManager.__nestFunctionScope(node, this.isInnerMethodDefinition);
222
223 // Process parameter declarations.
224 for (i = 0, iz = node.params.length; i < iz; ++i) {
225 this.visitPattern(node.params[i], { processRightHandNodes: true }, function (pattern, info) {
226 _this.currentScope().__define(pattern, new ParameterDefinition(pattern, node, i, info.rest));
227
228 _this.referencingDefaultValue(pattern, info.assignments, null, true);
229 });
230 }
231
232 // if there's a rest argument, add that
233 if (node.rest) {
234 this.visitPattern({
235 type: "RestElement",
236 argument: node.rest
237 }, function (pattern) {
238 _this.currentScope().__define(pattern, new ParameterDefinition(pattern, node, node.params.length, true));
239 });
240 }
241
242 // Skip BlockStatement to prevent creating BlockStatement scope.
243 if (node.body.type === Syntax.BlockStatement) {
244 this.visitChildren(node.body);
245 } else {
246 this.visit(node.body);
247 }
248
249 this.close(node);
250 }
251 },
252 visitClass: {
253 value: function visitClass(node) {
254 if (node.type === Syntax.ClassDeclaration) {
255 this.currentScope().__define(node.id, new Definition(Variable.ClassName, node.id, node, null, null, null));
256 }
257
258 // FIXME: Maybe consider TDZ.
259 this.visit(node.superClass);
260
261 this.scopeManager.__nestClassScope(node);
262
263 if (node.id) {
264 this.currentScope().__define(node.id, new Definition(Variable.ClassName, node.id, node));
265 }
266 this.visit(node.body);
267
268 this.close(node);
269 }
270 },
271 visitProperty: {
272 value: function visitProperty(node) {
273 var previous, isMethodDefinition;
274 if (node.computed) {
275 this.visit(node.key);
276 }
277
278 isMethodDefinition = node.type === Syntax.MethodDefinition;
279 if (isMethodDefinition) {
280 previous = this.pushInnerMethodDefinition(true);
281 }
282 this.visit(node.value);
283 if (isMethodDefinition) {
284 this.popInnerMethodDefinition(previous);
285 }
286 }
287 },
288 visitForIn: {
289 value: function visitForIn(node) {
290 var _this = this;
291
292 if (node.left.type === Syntax.VariableDeclaration && node.left.kind !== "var") {
293 this.materializeTDZScope(node.right, node);
294 this.visit(node.right);
295 this.close(node.right);
296
297 this.materializeIterationScope(node);
298 this.visit(node.body);
299 this.close(node);
300 } else {
301 if (node.left.type === Syntax.VariableDeclaration) {
302 this.visit(node.left);
303 this.visitPattern(node.left.declarations[0].id, function (pattern) {
304 _this.currentScope().__referencing(pattern, Reference.WRITE, node.right, null, true, true);
305 });
306 } else {
307 this.visitPattern(node.left, { processRightHandNodes: true }, function (pattern, info) {
308 var maybeImplicitGlobal = null;
309 if (!_this.currentScope().isStrict) {
310 maybeImplicitGlobal = {
311 pattern: pattern,
312 node: node
313 };
314 }
315 _this.referencingDefaultValue(pattern, info.assignments, maybeImplicitGlobal, false);
316 _this.currentScope().__referencing(pattern, Reference.WRITE, node.right, maybeImplicitGlobal, true, false);
317 });
318 }
319 this.visit(node.right);
320 this.visit(node.body);
321 }
322 }
323 },
324 visitVariableDeclaration: {
325 value: function visitVariableDeclaration(variableTargetScope, type, node, index, fromTDZ) {
326 var _this = this;
327
328 // If this was called to initialize a TDZ scope, this needs to make definitions, but doesn't make references.
329 var decl, init;
330
331 decl = node.declarations[index];
332 init = decl.init;
333 this.visitPattern(decl.id, { processRightHandNodes: !fromTDZ }, function (pattern, info) {
334 variableTargetScope.__define(pattern, new Definition(type, pattern, decl, node, index, node.kind));
335
336 if (!fromTDZ) {
337 _this.referencingDefaultValue(pattern, info.assignments, null, true);
338 }
339 if (init) {
340 _this.currentScope().__referencing(pattern, Reference.WRITE, init, null, !info.topLevel, true);
341 }
342 });
343 }
344 },
345 AssignmentExpression: {
346 value: function AssignmentExpression(node) {
347 var _this = this;
348
349 if (PatternVisitor.isPattern(node.left)) {
350 if (node.operator === "=") {
351 this.visitPattern(node.left, { processRightHandNodes: true }, function (pattern, info) {
352 var maybeImplicitGlobal = null;
353 if (!_this.currentScope().isStrict) {
354 maybeImplicitGlobal = {
355 pattern: pattern,
356 node: node
357 };
358 }
359 _this.referencingDefaultValue(pattern, info.assignments, maybeImplicitGlobal, false);
360 _this.currentScope().__referencing(pattern, Reference.WRITE, node.right, maybeImplicitGlobal, !info.topLevel, false);
361 });
362 } else {
363 this.currentScope().__referencing(node.left, Reference.RW, node.right);
364 }
365 } else {
366 this.visit(node.left);
367 }
368 this.visit(node.right);
369 }
370 },
371 CatchClause: {
372 value: function CatchClause(node) {
373 var _this = this;
374
375 this.scopeManager.__nestCatchScope(node);
376
377 this.visitPattern(node.param, { processRightHandNodes: true }, function (pattern, info) {
378 _this.currentScope().__define(pattern, new Definition(Variable.CatchClause, node.param, node, null, null, null));
379 _this.referencingDefaultValue(pattern, info.assignments, null, true);
380 });
381 this.visit(node.body);
382
383 this.close(node);
384 }
385 },
386 Program: {
387 value: function Program(node) {
388 this.scopeManager.__nestGlobalScope(node);
389
390 if (this.scopeManager.__isNodejsScope()) {
391 // Force strictness of GlobalScope to false when using node.js scope.
392 this.currentScope().isStrict = false;
393 this.scopeManager.__nestFunctionScope(node, false);
394 }
395
396 if (this.scopeManager.__isES6() && this.scopeManager.isModule()) {
397 this.scopeManager.__nestModuleScope(node);
398 }
399
400 this.visitChildren(node);
401 this.close(node);
402 }
403 },
404 Identifier: {
405 value: function Identifier(node) {
406 this.currentScope().__referencing(node);
407 }
408 },
409 UpdateExpression: {
410 value: function UpdateExpression(node) {
411 if (PatternVisitor.isPattern(node.argument)) {
412 this.currentScope().__referencing(node.argument, Reference.RW, null);
413 } else {
414 this.visitChildren(node);
415 }
416 }
417 },
418 MemberExpression: {
419 value: function MemberExpression(node) {
420 this.visit(node.object);
421 if (node.computed) {
422 this.visit(node.property);
423 }
424 }
425 },
426 Property: {
427 value: function Property(node) {
428 this.visitProperty(node);
429 }
430 },
431 MethodDefinition: {
432 value: function MethodDefinition(node) {
433 this.visitProperty(node);
434 }
435 },
436 BreakStatement: {
437 value: function BreakStatement() {}
438 },
439 ContinueStatement: {
440 value: function ContinueStatement() {}
441 },
442 LabeledStatement: {
443 value: function LabeledStatement(node) {
444 this.visit(node.body);
445 }
446 },
447 ForStatement: {
448 value: function ForStatement(node) {
449 // Create ForStatement declaration.
450 // NOTE: In ES6, ForStatement dynamically generates
451 // per iteration environment. However, escope is
452 // a static analyzer, we only generate one scope for ForStatement.
453 if (node.init && node.init.type === Syntax.VariableDeclaration && node.init.kind !== "var") {
454 this.scopeManager.__nestForScope(node);
455 }
456
457 this.visitChildren(node);
458
459 this.close(node);
460 }
461 },
462 ClassExpression: {
463 value: function ClassExpression(node) {
464 this.visitClass(node);
465 }
466 },
467 ClassDeclaration: {
468 value: function ClassDeclaration(node) {
469 this.visitClass(node);
470 }
471 },
472 CallExpression: {
473 value: function CallExpression(node) {
474 // Check this is direct call to eval
475 if (!this.scopeManager.__ignoreEval() && node.callee.type === Syntax.Identifier && node.callee.name === "eval") {
476 // NOTE: This should be `variableScope`. Since direct eval call always creates Lexical environment and
477 // let / const should be enclosed into it. Only VariableDeclaration affects on the caller's environment.
478 this.currentScope().variableScope.__detectEval();
479 }
480 this.visitChildren(node);
481 }
482 },
483 BlockStatement: {
484 value: function BlockStatement(node) {
485 if (this.scopeManager.__isES6()) {
486 this.scopeManager.__nestBlockScope(node);
487 }
488
489 this.visitChildren(node);
490
491 this.close(node);
492 }
493 },
494 ThisExpression: {
495 value: function ThisExpression() {
496 this.currentScope().variableScope.__detectThis();
497 }
498 },
499 WithStatement: {
500 value: function WithStatement(node) {
501 this.visit(node.object);
502 // Then nest scope for WithStatement.
503 this.scopeManager.__nestWithScope(node);
504
505 this.visit(node.body);
506
507 this.close(node);
508 }
509 },
510 VariableDeclaration: {
511 value: function VariableDeclaration(node) {
512 var variableTargetScope, i, iz, decl;
513 variableTargetScope = node.kind === "var" ? this.currentScope().variableScope : this.currentScope();
514 for (i = 0, iz = node.declarations.length; i < iz; ++i) {
515 decl = node.declarations[i];
516 this.visitVariableDeclaration(variableTargetScope, Variable.Variable, node, i);
517 if (decl.init) {
518 this.visit(decl.init);
519 }
520 }
521 }
522 },
523 SwitchStatement: {
524
525 // sec 13.11.8
526
527 value: function SwitchStatement(node) {
528 var i, iz;
529
530 this.visit(node.discriminant);
531
532 if (this.scopeManager.__isES6()) {
533 this.scopeManager.__nestSwitchScope(node);
534 }
535
536 for (i = 0, iz = node.cases.length; i < iz; ++i) {
537 this.visit(node.cases[i]);
538 }
539
540 this.close(node);
541 }
542 },
543 FunctionDeclaration: {
544 value: function FunctionDeclaration(node) {
545 this.visitFunction(node);
546 }
547 },
548 FunctionExpression: {
549 value: function FunctionExpression(node) {
550 this.visitFunction(node);
551 }
552 },
553 ForOfStatement: {
554 value: function ForOfStatement(node) {
555 this.visitForIn(node);
556 }
557 },
558 ForInStatement: {
559 value: function ForInStatement(node) {
560 this.visitForIn(node);
561 }
562 },
563 ArrowFunctionExpression: {
564 value: function ArrowFunctionExpression(node) {
565 this.visitFunction(node);
566 }
567 },
568 ImportDeclaration: {
569 value: function ImportDeclaration(node) {
570 var importer;
571
572 assert(this.scopeManager.__isES6() && this.scopeManager.isModule(), "ImportDeclaration should appear when the mode is ES6 and in the module context.");
573
574 importer = new Importer(node, this);
575 importer.visit(node);
576 }
577 },
578 visitExportDeclaration: {
579 value: function visitExportDeclaration(node) {
580 if (node.source) {
581 return;
582 }
583 if (node.declaration) {
584 this.visit(node.declaration);
585 return;
586 }
587
588 this.visitChildren(node);
589 }
590 },
591 ExportDeclaration: {
592 value: function ExportDeclaration(node) {
593 this.visitExportDeclaration(node);
594 }
595 },
596 ExportNamedDeclaration: {
597 value: function ExportNamedDeclaration(node) {
598 this.visitExportDeclaration(node);
599 }
600 },
601 ExportSpecifier: {
602 value: function ExportSpecifier(node) {
603 var local = node.id || node.local;
604 this.visit(local);
605 }
606 }
607 });
608
609 return Referencer;
610})(esrecurse.Visitor);
611
612module.exports = Referencer;
613
614/* vim: set sw=4 ts=4 et tw=80 : */
615//# 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 Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>\n\n  Redistribution and use in source and binary forms, with or without\n  modification, are permitted provided that the following conditions are met:\n\n    * Redistributions of source code must retain the above copyright\n      notice, this list of conditions and the following disclaimer.\n    * Redistributions in binary form must reproduce the above copyright\n      notice, this list of conditions and the following disclaimer in the\n      documentation and/or other materials provided with the distribution.\n\n  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\"\n  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\n  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\n  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY\n  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\n  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND\n  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF\n  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n*/\nimport { Syntax } from 'estraverse';\nimport esrecurse from 'esrecurse';\nimport Reference from './reference';\nimport Variable from './variable';\nimport PatternVisitor from './pattern-visitor';\nimport { ParameterDefinition, Definition } from './definition';\nimport assert from 'assert';\n\nfunction traverseIdentifierInPattern(rootPattern, referencer, callback) {\n    // Call the callback at left hand identifier nodes, and Collect right hand nodes.\n    var visitor = new PatternVisitor(rootPattern, callback);\n    visitor.visit(rootPattern);\n\n    // Process the right hand nodes recursively.\n    if (referencer != null) {\n        visitor.rightHandNodes.forEach(referencer.visit, referencer);\n    }\n}\n\n// Importing ImportDeclaration.\n// http://people.mozilla.org/~jorendorff/es6-draft.html#sec-moduledeclarationinstantiation\n// https://github.com/estree/estree/blob/master/es6.md#importdeclaration\n// FIXME: Now, we don't create module environment, because the context is\n// implementation dependent.\n\nclass Importer extends esrecurse.Visitor {\n    constructor(declaration, referencer) {\n        super();\n        this.declaration = declaration;\n        this.referencer = referencer;\n    }\n\n    visitImport(id, specifier) {\n        this.referencer.visitPattern(id, (pattern) => {\n            this.referencer.currentScope().__define(pattern,\n                new Definition(\n                    Variable.ImportBinding,\n                    pattern,\n                    specifier,\n                    this.declaration,\n                    null,\n                    null\n                    ));\n        });\n    }\n\n    ImportNamespaceSpecifier(node) {\n        let local = (node.local || node.id);\n        if (local) {\n            this.visitImport(local, node);\n        }\n    }\n\n    ImportDefaultSpecifier(node) {\n        let local = (node.local || node.id);\n        this.visitImport(local, node);\n    }\n\n    ImportSpecifier(node) {\n        let local = (node.local || node.id);\n        if (node.name) {\n            this.visitImport(node.name, node);\n        } else {\n            this.visitImport(local, node);\n        }\n    }\n}\n\n// Referencing variables and creating bindings.\nexport default class Referencer extends esrecurse.Visitor {\n    constructor(scopeManager) {\n        super();\n        this.scopeManager = scopeManager;\n        this.parent = null;\n        this.isInnerMethodDefinition = false;\n    }\n\n    currentScope() {\n        return this.scopeManager.__currentScope;\n    }\n\n    close(node) {\n        while (this.currentScope() && node === this.currentScope().block) {\n            this.scopeManager.__currentScope = this.currentScope().__close(this.scopeManager);\n        }\n    }\n\n    pushInnerMethodDefinition(isInnerMethodDefinition) {\n        var previous = this.isInnerMethodDefinition;\n        this.isInnerMethodDefinition = isInnerMethodDefinition;\n        return previous;\n    }\n\n    popInnerMethodDefinition(isInnerMethodDefinition) {\n        this.isInnerMethodDefinition = isInnerMethodDefinition;\n    }\n\n    materializeTDZScope(node, iterationNode) {\n        // http://people.mozilla.org/~jorendorff/es6-draft.html#sec-runtime-semantics-forin-div-ofexpressionevaluation-abstract-operation\n        // TDZ scope hides the declaration's names.\n        this.scopeManager.__nestTDZScope(node, iterationNode);\n        this.visitVariableDeclaration(this.currentScope(), Variable.TDZ, iterationNode.left, 0, true);\n    }\n\n    materializeIterationScope(node) {\n        // Generate iteration scope for upper ForIn/ForOf Statements.\n        var letOrConstDecl;\n        this.scopeManager.__nestForScope(node);\n        letOrConstDecl = node.left;\n        this.visitVariableDeclaration(this.currentScope(), Variable.Variable, letOrConstDecl, 0);\n        this.visitPattern(letOrConstDecl.declarations[0].id, (pattern) => {\n            this.currentScope().__referencing(pattern, Reference.WRITE, node.right, null, true, true);\n        });\n    }\n\n    referencingDefaultValue(pattern, assignments, maybeImplicitGlobal, init) {\n        const scope = this.currentScope();\n        assignments.forEach(assignment => {\n            scope.__referencing(\n                pattern,\n                Reference.WRITE,\n                assignment.right,\n                maybeImplicitGlobal,\n                pattern !== assignment.left,\n                init);\n        });\n    }\n\n    visitPattern(node, options, callback) {\n        if (typeof options === 'function') {\n            callback = options;\n            options = {processRightHandNodes: false}\n        }\n        traverseIdentifierInPattern(\n            node,\n            options.processRightHandNodes ? this : null,\n            callback);\n    }\n\n    visitFunction(node) {\n        var i, iz;\n        // FunctionDeclaration name is defined in upper scope\n        // NOTE: Not referring variableScope. It is intended.\n        // Since\n        //  in ES5, FunctionDeclaration should be in FunctionBody.\n        //  in ES6, FunctionDeclaration should be block scoped.\n        if (node.type === Syntax.FunctionDeclaration) {\n            // id is defined in upper scope\n            this.currentScope().__define(node.id,\n                    new Definition(\n                        Variable.FunctionName,\n                        node.id,\n                        node,\n                        null,\n                        null,\n                        null\n                    ));\n        }\n\n        // FunctionExpression with name creates its special scope;\n        // FunctionExpressionNameScope.\n        if (node.type === Syntax.FunctionExpression && node.id) {\n            this.scopeManager.__nestFunctionExpressionNameScope(node);\n        }\n\n        // Consider this function is in the MethodDefinition.\n        this.scopeManager.__nestFunctionScope(node, this.isInnerMethodDefinition);\n\n        // Process parameter declarations.\n        for (i = 0, iz = node.params.length; i < iz; ++i) {\n            this.visitPattern(node.params[i], {processRightHandNodes: true}, (pattern, info) => {\n                this.currentScope().__define(pattern,\n                    new ParameterDefinition(\n                        pattern,\n                        node,\n                        i,\n                        info.rest\n                    ));\n\n                this.referencingDefaultValue(pattern, info.assignments, null, true);\n            });\n        }\n\n        // if there's a rest argument, add that\n        if (node.rest) {\n            this.visitPattern({\n                type: 'RestElement',\n                argument: node.rest\n            }, (pattern) => {\n                this.currentScope().__define(pattern,\n                    new ParameterDefinition(\n                        pattern,\n                        node,\n                        node.params.length,\n                        true\n                    ));\n            });\n        }\n\n        // Skip BlockStatement to prevent creating BlockStatement scope.\n        if (node.body.type === Syntax.BlockStatement) {\n            this.visitChildren(node.body);\n        } else {\n            this.visit(node.body);\n        }\n\n        this.close(node);\n    }\n\n    visitClass(node) {\n        if (node.type === Syntax.ClassDeclaration) {\n            this.currentScope().__define(node.id,\n                    new Definition(\n                        Variable.ClassName,\n                        node.id,\n                        node,\n                        null,\n                        null,\n                        null\n                    ));\n        }\n\n        // FIXME: Maybe consider TDZ.\n        this.visit(node.superClass);\n\n        this.scopeManager.__nestClassScope(node);\n\n        if (node.id) {\n            this.currentScope().__define(node.id,\n                    new Definition(\n                        Variable.ClassName,\n                        node.id,\n                        node\n                    ));\n        }\n        this.visit(node.body);\n\n        this.close(node);\n    }\n\n    visitProperty(node) {\n        var previous, isMethodDefinition;\n        if (node.computed) {\n            this.visit(node.key);\n        }\n\n        isMethodDefinition = node.type === Syntax.MethodDefinition;\n        if (isMethodDefinition) {\n            previous = this.pushInnerMethodDefinition(true);\n        }\n        this.visit(node.value);\n        if (isMethodDefinition) {\n            this.popInnerMethodDefinition(previous);\n        }\n    }\n\n    visitForIn(node) {\n        if (node.left.type === Syntax.VariableDeclaration && node.left.kind !== 'var') {\n            this.materializeTDZScope(node.right, node);\n            this.visit(node.right);\n            this.close(node.right);\n\n            this.materializeIterationScope(node);\n            this.visit(node.body);\n            this.close(node);\n        } else {\n            if (node.left.type === Syntax.VariableDeclaration) {\n                this.visit(node.left);\n                this.visitPattern(node.left.declarations[0].id, (pattern) => {\n                    this.currentScope().__referencing(pattern, Reference.WRITE, node.right, null, true, true);\n                });\n            } else {\n                this.visitPattern(node.left, {processRightHandNodes: true}, (pattern, info) => {\n                    var maybeImplicitGlobal = null;\n                    if (!this.currentScope().isStrict) {\n                        maybeImplicitGlobal = {\n                            pattern: pattern,\n                            node: node\n                        };\n                    }\n                    this.referencingDefaultValue(pattern, info.assignments, maybeImplicitGlobal, false);\n                    this.currentScope().__referencing(pattern, Reference.WRITE, node.right, maybeImplicitGlobal, true, false);\n                });\n            }\n            this.visit(node.right);\n            this.visit(node.body);\n        }\n    }\n\n    visitVariableDeclaration(variableTargetScope, type, node, index, fromTDZ) {\n        // If this was called to initialize a TDZ scope, this needs to make definitions, but doesn't make references.\n        var decl, init;\n\n        decl = node.declarations[index];\n        init = decl.init;\n        this.visitPattern(decl.id, {processRightHandNodes: !fromTDZ}, (pattern, info) => {\n            variableTargetScope.__define(pattern,\n                new Definition(\n                    type,\n                    pattern,\n                    decl,\n                    node,\n                    index,\n                    node.kind\n                ));\n\n            if (!fromTDZ) {\n                this.referencingDefaultValue(pattern, info.assignments, null, true);\n            }\n            if (init) {\n                this.currentScope().__referencing(pattern, Reference.WRITE, init, null, !info.topLevel, true);\n            }\n        });\n    }\n\n    AssignmentExpression(node) {\n        if (PatternVisitor.isPattern(node.left)) {\n            if (node.operator === '=') {\n                this.visitPattern(node.left, {processRightHandNodes: true}, (pattern, info) => {\n                    var maybeImplicitGlobal = null;\n                    if (!this.currentScope().isStrict) {\n                        maybeImplicitGlobal = {\n                            pattern: pattern,\n                            node: node\n                        };\n                    }\n                    this.referencingDefaultValue(pattern, info.assignments, maybeImplicitGlobal, false);\n                    this.currentScope().__referencing(pattern, Reference.WRITE, node.right, maybeImplicitGlobal, !info.topLevel, false);\n                });\n            } else {\n                this.currentScope().__referencing(node.left, Reference.RW, node.right);\n            }\n        } else {\n            this.visit(node.left);\n        }\n        this.visit(node.right);\n    }\n\n    CatchClause(node) {\n        this.scopeManager.__nestCatchScope(node);\n\n        this.visitPattern(node.param, {processRightHandNodes: true}, (pattern, info) => {\n            this.currentScope().__define(pattern,\n                new Definition(\n                    Variable.CatchClause,\n                    node.param,\n                    node,\n                    null,\n                    null,\n                    null\n                ));\n            this.referencingDefaultValue(pattern, info.assignments, null, true);\n        });\n        this.visit(node.body);\n\n        this.close(node);\n    }\n\n    Program(node) {\n        this.scopeManager.__nestGlobalScope(node);\n\n        if (this.scopeManager.__isNodejsScope()) {\n            // Force strictness of GlobalScope to false when using node.js scope.\n            this.currentScope().isStrict = false;\n            this.scopeManager.__nestFunctionScope(node, false);\n        }\n\n        if (this.scopeManager.__isES6() && this.scopeManager.isModule()) {\n            this.scopeManager.__nestModuleScope(node);\n        }\n\n        this.visitChildren(node);\n        this.close(node);\n    }\n\n    Identifier(node) {\n        this.currentScope().__referencing(node);\n    }\n\n    UpdateExpression(node) {\n        if (PatternVisitor.isPattern(node.argument)) {\n            this.currentScope().__referencing(node.argument, Reference.RW, null);\n        } else {\n            this.visitChildren(node);\n        }\n    }\n\n    MemberExpression(node) {\n        this.visit(node.object);\n        if (node.computed) {\n            this.visit(node.property);\n        }\n    }\n\n    Property(node) {\n        this.visitProperty(node);\n    }\n\n    MethodDefinition(node) {\n        this.visitProperty(node);\n    }\n\n    BreakStatement() {}\n\n    ContinueStatement() {}\n\n    LabeledStatement(node) {\n        this.visit(node.body);\n    }\n\n    ForStatement(node) {\n        // Create ForStatement declaration.\n        // NOTE: In ES6, ForStatement dynamically generates\n        // per iteration environment. However, escope is\n        // a static analyzer, we only generate one scope for ForStatement.\n        if (node.init && node.init.type === Syntax.VariableDeclaration && node.init.kind !== 'var') {\n            this.scopeManager.__nestForScope(node);\n        }\n\n        this.visitChildren(node);\n\n        this.close(node);\n    }\n\n    ClassExpression(node) {\n        this.visitClass(node);\n    }\n\n    ClassDeclaration(node) {\n        this.visitClass(node);\n    }\n\n    CallExpression(node) {\n        // Check this is direct call to eval\n        if (!this.scopeManager.__ignoreEval() && node.callee.type === Syntax.Identifier && node.callee.name === 'eval') {\n            // NOTE: This should be `variableScope`. Since direct eval call always creates Lexical environment and\n            // let / const should be enclosed into it. Only VariableDeclaration affects on the caller's environment.\n            this.currentScope().variableScope.__detectEval();\n        }\n        this.visitChildren(node);\n    }\n\n    BlockStatement(node) {\n        if (this.scopeManager.__isES6()) {\n            this.scopeManager.__nestBlockScope(node);\n        }\n\n        this.visitChildren(node);\n\n        this.close(node);\n    }\n\n    ThisExpression() {\n        this.currentScope().variableScope.__detectThis();\n    }\n\n    WithStatement(node) {\n        this.visit(node.object);\n        // Then nest scope for WithStatement.\n        this.scopeManager.__nestWithScope(node);\n\n        this.visit(node.body);\n\n        this.close(node);\n    }\n\n    VariableDeclaration(node) {\n        var variableTargetScope, i, iz, decl;\n        variableTargetScope = (node.kind === 'var') ? this.currentScope().variableScope : this.currentScope();\n        for (i = 0, iz = node.declarations.length; i < iz; ++i) {\n            decl = node.declarations[i];\n            this.visitVariableDeclaration(variableTargetScope, Variable.Variable, node, i);\n            if (decl.init) {\n                this.visit(decl.init);\n            }\n        }\n    }\n\n    // sec 13.11.8\n    SwitchStatement(node) {\n        var i, iz;\n\n        this.visit(node.discriminant);\n\n        if (this.scopeManager.__isES6()) {\n            this.scopeManager.__nestSwitchScope(node);\n        }\n\n        for (i = 0, iz = node.cases.length; i < iz; ++i) {\n            this.visit(node.cases[i]);\n        }\n\n        this.close(node);\n    }\n\n    FunctionDeclaration(node) {\n        this.visitFunction(node);\n    }\n\n    FunctionExpression(node) {\n        this.visitFunction(node);\n    }\n\n    ForOfStatement(node) {\n        this.visitForIn(node);\n    }\n\n    ForInStatement(node) {\n        this.visitForIn(node);\n    }\n\n    ArrowFunctionExpression(node) {\n        this.visitFunction(node);\n    }\n\n    ImportDeclaration(node) {\n        var importer;\n\n        assert(this.scopeManager.__isES6() && this.scopeManager.isModule(), 'ImportDeclaration should appear when the mode is ES6 and in the module context.');\n\n        importer = new Importer(node, this);\n        importer.visit(node);\n    }\n\n    visitExportDeclaration(node) {\n        if (node.source) {\n            return;\n        }\n        if (node.declaration) {\n            this.visit(node.declaration);\n            return;\n        }\n\n        this.visitChildren(node);\n    }\n\n    ExportDeclaration(node) {\n        this.visitExportDeclaration(node);\n    }\n\n    ExportNamedDeclaration(node) {\n        this.visitExportDeclaration(node);\n    }\n\n    ExportSpecifier(node) {\n        let local = (node.id || node.local);\n        this.visit(local);\n    }\n}\n\n/* vim: set sw=4 ts=4 et tw=80 : */\n"],"sourceRoot":"/source/"}