| 1 | {"version":3,"sources":["asynciterable/scan.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,cAAc,EAAE,MAAM,kBAAkB,CAAC;AAElD,MAAM,OAAO,iBAAwB,SAAQ,cAAiB;IAM5D,YACE,MAAwB,EACxB,EAAmD,EACnD,IAAS;QAET,KAAK,EAAE,CAAC;QACR,IAAI,CAAC,OAAO,GAAG,MAAM,CAAC;QACtB,IAAI,CAAC,GAAG,GAAG,EAAE,CAAC;QACd,IAAI,CAAC,QAAQ,GAAG,IAAI,CAAC,MAAM,KAAK,CAAC,CAAC;QAClC,IAAI,CAAC,KAAK,GAAG,IAAI,CAAC,CAAC,CAAC,CAAC;IACvB,CAAC;IAED,KAAK,CAAC,CAAC,CAAC,MAAM,CAAC,aAAa,CAAC;QAC3B,IAAI,CAAC,GAAG,CAAC,EACP,QAAQ,GAAG,KAAK,EAChB,GAAG,GAAG,IAAI,CAAC,KAAK,CAAC;QACnB,IAAI,KAAK,EAAE,IAAI,IAAI,IAAI,IAAI,CAAC,OAAO,EAAE;YACnC,IAAI,QAAQ,IAAI,CAAC,QAAQ,GAAG,IAAI,CAAC,QAAQ,CAAC,EAAE;gBAC1C,GAAG,GAAG,MAAM,IAAI,CAAC,GAAG,CAAI,GAAG,EAAE,IAAI,EAAE,CAAC,EAAE,CAAC,CAAC;gBACxC,MAAM,GAAG,CAAC;aACX;iBAAM;gBACL,GAAG,GAAG,IAAI,CAAC;gBACX,QAAQ,GAAG,IAAI,CAAC;gBAChB,CAAC,EAAE,CAAC;aACL;SACF;QACD,IAAI,CAAC,KAAK,CAAC,IAAI,CAAC,IAAI,CAAC,QAAQ,EAAE;YAC7B,MAAM,GAAQ,CAAC;SAChB;IACH,CAAC;CACF;AAYD,MAAM,UAAU,IAAI,CAClB,MAAwB,EACxB,WAAwF,EACxF,GAAG,IAAS;IAEZ,OAAO,IAAI,iBAAiB,CAAC,MAAM,EAAE,WAAW,EAAE,IAAI,CAAC,CAAC;AAC1D,CAAC","file":"scan.js","sourcesContent":["import { AsyncIterableX } from './asynciterablex';\n\nexport class ScanAsyncIterable<T, R> extends AsyncIterableX<R> {\n private _source: AsyncIterable<T>;\n private _fn: (acc: R, x: T, index: number) => R | Promise<R>;\n private _seed?: T | R;\n private _hasSeed: boolean;\n\n constructor(\n source: AsyncIterable<T>,\n fn: (acc: R, x: T, index: number) => R | Promise<R>,\n seed: R[]\n ) {\n super();\n this._source = source;\n this._fn = fn;\n this._hasSeed = seed.length === 1;\n this._seed = seed[0];\n }\n\n async *[Symbol.asyncIterator]() {\n let i = 0,\n hasValue = false,\n acc = this._seed;\n for await (let item of this._source) {\n if (hasValue || (hasValue = this._hasSeed)) {\n acc = await this._fn(<R>acc, item, i++);\n yield acc;\n } else {\n acc = item;\n hasValue = true;\n i++;\n }\n }\n if (i === 1 && !this._hasSeed) {\n yield acc as R;\n }\n }\n}\n\nexport function scan<T, R = T>(\n source: AsyncIterable<T>,\n accumulator: (previousValue: R, currentValue: T, currentIndex: number) => R | Promise<R>,\n seed?: never[]\n): AsyncIterableX<R>;\nexport function scan<T, R = T>(\n source: AsyncIterable<T>,\n accumulator: (previousValue: R, currentValue: T, currentIndex: number) => R | Promise<R>,\n seed?: R\n): AsyncIterableX<R>;\nexport function scan<T, R = T>(\n source: AsyncIterable<T>,\n accumulator: (previousValue: R, currentValue: T, currentIndex: number) => R | Promise<R>,\n ...seed: R[]\n): AsyncIterableX<R> {\n return new ScanAsyncIterable(source, accumulator, seed);\n}\n"]} |