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s.golasch
184
build/node_modules/prepack/lib/partial-evaluators/ArrayExpression.js
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184
build/node_modules/prepack/lib/partial-evaluators/ArrayExpression.js
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }(); /**
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* Copyright (c) 2017-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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// ECMA262 2.2.5.3
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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 partial_elements = [];
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var io = [];
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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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var elemValue = void 0,
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elemAst = void 0,
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elemIO = void 0;
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if (elem.type === "SpreadElement") {
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;
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var _env$partiallyEvaluat = env.partiallyEvaluateCompletionDeref(elem.argument, strictCode);
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var _env$partiallyEvaluat2 = _slicedToArray(_env$partiallyEvaluat, 3);
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elemValue = _env$partiallyEvaluat2[0];
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elemAst = _env$partiallyEvaluat2[1];
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elemIO = _env$partiallyEvaluat2[2];
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} else {
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;
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var _env$partiallyEvaluat3 = env.partiallyEvaluateCompletionDeref(elem, strictCode);
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var _env$partiallyEvaluat4 = _slicedToArray(_env$partiallyEvaluat3, 3);
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elemValue = _env$partiallyEvaluat4[0];
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elemAst = _env$partiallyEvaluat4[1];
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elemIO = _env$partiallyEvaluat4[2];
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}io.concat(elemIO);
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if (elemValue instanceof _completions.AbruptCompletion) {
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return [elemValue, ast, io]; //todo: log an error message
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} else if (elemValue instanceof _completions.PossiblyNormalCompletion) {
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// TODO: there was a conditional abrupt completion while evaluating elem, so join states somehow
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_index2.AbstractValue.reportIntrospectionError(elemValue.value);
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throw new _errors.FatalError();
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}
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(0, _invariant2.default)(elemValue instanceof _index2.Value);
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partial_elements[nextIndex] = elemAst;
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// ECMA262 12.2.5.2
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if (elem.type === "SpreadElement") {
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var spreadObj = elemValue;
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partial_elements[nextIndex] = t.spreadElement(elemAst);
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// update the abstract state with the contents of spreadObj, if known
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if (spreadObj instanceof _index2.ObjectValue && !spreadObj.isPartialObject()) {
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// 3. Let iterator be ? GetIterator(spreadObj).
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var iterator = (0, _index.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, _index.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, _index.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 _index2.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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nextIndex++;
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}
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} else {
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// Update the abstract state to reflect our lack of complete knowledge
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// of all of the properties of the result of evaluating elem.
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array.makePartial();
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// terminate the loop if all elements have been processed
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if (i === len - 1) break;
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// If there are elements that come after this spread element, we need
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// to take their effects into account for the abstract state that results
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// from the array expression.
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// First check if the runtime spread operation cannot fail
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if (spreadObj instanceof _index2.AbstractValue && spreadObj.getType() === "Array") {
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var method = (0, _index.GetMethod)(realm, spreadObj, realm.intrinsics.SymbolIterator);
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if (method === realm.intrinsics.ArrayProto_values) continue;
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}
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// At this point we have to be pessimistic and assume that iterating spreadObj may
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// throw an exception, in which case we can't assume that the remaining element
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// expressions will be evaluated at runtime. As a consequence their effects
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// have be provisional.
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// TODO: join states somehow
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_index2.AbstractValue.reportIntrospectionError(spreadObj);
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throw new _errors.FatalError();
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}
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} else if (array.isPartialObject()) {
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// Dealing with an array element that follows on a spread object that
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// could not be iterated at compile time, so the index that this element
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// will have at runtime is not known at this point.
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var abstractIndex = _index2.AbstractValue.createFromType(realm, _index2.NumberValue);
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array.$SetPartial(abstractIndex, elemValue, array);
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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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// 5. Let initValue be ? GetValue(initResult).
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var initValue = elemValue;
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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 _index2.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 _index2.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, t.arrayExpression(partial_elements), io];
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};
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var _completions = require("../completions.js");
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var _errors = require("../errors.js");
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var _index = require("../methods/index.js");
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var _index2 = require("../values/index.js");
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var _singletons = require("../singletons.js");
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var _invariant = require("../invariant.js");
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var _invariant2 = _interopRequireDefault(_invariant);
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var _babelTypes = require("babel-types");
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var t = _interopRequireWildcard(_babelTypes);
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function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
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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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