97 lines
3.4 KiB
JavaScript
97 lines
3.4 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = function (ast, strictCode, env, realm) {
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// 1. Let array be ArrayCreate(0).
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var array = _singletons.Create.ArrayCreate(realm, 0);
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// 2. Let len be the result of performing ArrayAccumulation for ElementList with arguments array and 0.
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var elements = ast.elements || [];
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var len = elements.length;
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var nextIndex = 0;
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for (var i = 0; i < len; i++) {
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var elem = elements[i];
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if (!elem) {
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nextIndex++;
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continue;
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}
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// ECMA262 12.2.5.2
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if (elem.type === "SpreadElement") {
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// 1. Let spreadRef be the result of evaluating AssignmentExpression.
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var spreadRef = env.evaluate(elem.argument, strictCode);
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// 2. Let spreadObj be ? GetValue(spreadRef).
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var spreadObj = _singletons.Environment.GetValue(realm, spreadRef);
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// 3. Let iterator be ? GetIterator(spreadObj).
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var iterator = (0, _index2.GetIterator)(realm, spreadObj);
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// 4. Repeat
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while (true) {
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// a. Let next be ? IteratorStep(iterator).
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var next = (0, _iterator.IteratorStep)(realm, iterator);
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// b. If next is false, return nextIndex.
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if (next === false) break;
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// c. Let nextValue be ? IteratorValue(next).
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var nextValue = (0, _iterator.IteratorValue)(realm, next);
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// d. Let status be CreateDataProperty(array, ToString(ToUint32(nextIndex)), nextValue).
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var status = _singletons.Create.CreateDataProperty(realm, array, new _index.StringValue(realm, nextIndex++ + ""), nextValue);
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// e. Assert: status is true.
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(0, _invariant2.default)(status === true);
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// f. Let nextIndex be nextIndex + 1.
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}
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} else {
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// Redundant steps.
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// 1. Let postIndex be the result of performing ArrayAccumulation for ElementList with arguments array and nextIndex.
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// 2. ReturnIfAbrupt(postIndex).
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// 3. Let padding be the ElisionWidth of Elision; if Elision is not present, use the numeric value zero.
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// 4. Let initResult be the result of evaluating AssignmentExpression.
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var initResult = env.evaluate(elem, strictCode);
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// 5. Let initValue be ? GetValue(initResult).
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var initValue = _singletons.Environment.GetValue(realm, initResult);
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// 6. Let created be CreateDataProperty(array, ToString(ToUint32(postIndex+padding)), initValue).
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var created = _singletons.Create.CreateDataProperty(realm, array, new _index.StringValue(realm, nextIndex++ + ""), initValue);
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// 7. Assert: created is true.
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(0, _invariant2.default)(created === true, "expected data property creation");
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}
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}
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// Not necessary since we propagate completions with exceptions.
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// 3. ReturnIfAbrupt(len).
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// 4. Perform Set(array, "length", ToUint32(len), false).
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_singletons.Properties.Set(realm, array, "length", new _index.NumberValue(realm, nextIndex), false);
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// 5. NOTE: The above Set cannot fail because of the nature of the object returned by ArrayCreate.
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// 6. Return array.
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return array;
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};
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var _index = require("../values/index.js");
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var _index2 = require("../methods/index.js");
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var _invariant = require("../invariant.js");
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var _invariant2 = _interopRequireDefault(_invariant);
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var _iterator = require("../methods/iterator.js");
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var _singletons = require("../singletons.js");
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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//# sourceMappingURL=ArrayExpression.js.map
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