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An additional grant\n * of patent rights can be found in the PATENTS file in the same directory.\n */\n\n/* @flow strict-local */\n\nimport type { Realm } from \"../realm.js\";\nimport type { PropertyKeyValue, Descriptor } from \"../types.js\";\nimport { ObjectValue, NumberValue, StringValue } from \"./index.js\";\nimport { IsInteger, IsArrayIndex } from \"../methods/is.js\";\nimport { Properties, To } from \"../singletons.js\";\nimport invariant from \"../invariant.js\";\n\nexport default class StringExotic extends ObjectValue {\n constructor(realm: Realm, intrinsicName?: string) {\n super(realm, realm.intrinsics.StringPrototype, intrinsicName);\n }\n\n // ECMA262 9.4.3.1\n $GetOwnProperty(P: PropertyKeyValue): Descriptor | void {\n // 1. Assert: IsPropertyKey(P) is true.\n\n // 2. Let desc be OrdinaryGetOwnProperty(S, P).\n let desc = Properties.OrdinaryGetOwnProperty(this.$Realm, this, P);\n\n // 3. If desc is not undefined, return desc.\n if (desc !== undefined) {\n Properties.ThrowIfMightHaveBeenDeleted(desc.value);\n return desc;\n }\n\n // 4. If Type(P) is not String, return undefined.\n if (typeof P !== \"string\" && !(P instanceof StringValue)) return undefined;\n\n // 5. Let index be ! CanonicalNumericIndexString(P).\n let index = To.CanonicalNumericIndexString(\n this.$Realm,\n typeof P === \"string\" ? new StringValue(this.$Realm, P) : P\n );\n\n // 6. If index is undefined, return undefined.\n if (index === undefined || index === null) return undefined;\n\n // 7. If IsInteger(index) is false, return undefined.\n if (IsInteger(this.$Realm, index) === false) return undefined;\n\n // 8. If index = -0, return undefined.\n if (1.0 / index === -Infinity) return undefined;\n\n // 9. Let str be the String value of S.[[StringData]].\n let str = this.$StringData;\n invariant(str);\n str = str.throwIfNotConcreteString();\n\n // 10. Let len be the number of elements in str.\n let len = str.value.length;\n\n // 11. If index < 0 or len ≤ index, return undefined.\n if (index < 0 || len <= index) return undefined;\n\n // 12. Let resultStr be a String value of length 1, containing one code unit from str, specifically the code unit at index index.\n let resultStr = new StringValue(this.$Realm, str.value.charAt(index));\n\n // 13. Return a PropertyDescriptor{[[Value]]: resultStr, [[Writable]]: false, [[Enumerable]]: true, [[Configurable]]: false}.\n return {\n value: resultStr,\n writable: false,\n enumerable: true,\n configurable: false,\n };\n }\n\n // ECMA262 9.4.3.2\n $OwnPropertyKeys(): Array<PropertyKeyValue> {\n // 1. Let keys be a new empty List.\n let keys = [];\n\n // 2. Let str be the String value of O.[[StringData]].\n let str = this.$StringData;\n invariant(str);\n str = str.throwIfNotConcreteString();\n\n // 3. Let len be the number of elements in str.\n let len = str.value.length;\n\n // 4. For each integer i starting with 0 such that i < len, in ascending order,\n for (let i = 0; i < len; ++i) {\n // a. Add ! ToString(i) as the last element of keys.\n keys.push(new StringValue(this.$Realm, To.ToString(this.$Realm, new NumberValue(this.$Realm, i))));\n }\n\n // 5. For each own property key P of O such that P is an integer index and ToInteger(P) ≥ len, in ascending numeric index order,\n let properties = this.getOwnPropertyKeysArray();\n for (let key of properties\n .filter(x => IsArrayIndex(this.$Realm, x))\n .map(x => parseInt(x, 10))\n .filter(x => To.ToInteger(this.$Realm, x) >= len)\n .sort((x, y) => x - y)) {\n // i. Add P as the last element of keys.\n keys.push(new StringValue(this.$Realm, key + \"\"));\n }\n\n // 6. For each own property key P of O such that Type(P) is String and P is not an integer index, in ascending chronological order of property creation,\n for (let key of properties.filter(x => !IsArrayIndex(this.$Realm, x))) {\n // i. Add P as the last element of keys.\n keys.push(new StringValue(this.$Realm, key));\n }\n\n // 7. For each own property key P of O such that Type(P) is Symbol, in ascending chronological order of property creation,\n for (let key of this.symbols.keys()) {\n // i. Add P as the last element of keys.\n keys.push(key);\n }\n\n // 12. Return keys.\n return keys;\n }\n}\n"],"file":"StringExotic.js"} |