tuple.ts 2.0 KB

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  1. import { defineProperties } from "../../utils/properties.js";
  2. import { Typed } from "../typed.js";
  3. import { Coder } from "./abstract-coder.js";
  4. import { pack, unpack } from "./array.js";
  5. import type { Reader, Writer } from "./abstract-coder.js";
  6. /**
  7. * @_ignore
  8. */
  9. export class TupleCoder extends Coder {
  10. readonly coders!: ReadonlyArray<Coder>;
  11. constructor(coders: Array<Coder>, localName: string) {
  12. let dynamic = false;
  13. const types: Array<string> = [];
  14. coders.forEach((coder) => {
  15. if (coder.dynamic) { dynamic = true; }
  16. types.push(coder.type);
  17. });
  18. const type = ("tuple(" + types.join(",") + ")");
  19. super("tuple", type, localName, dynamic);
  20. defineProperties<TupleCoder>(this, { coders: Object.freeze(coders.slice()) });
  21. }
  22. defaultValue(): any {
  23. const values: any = [ ];
  24. this.coders.forEach((coder) => {
  25. values.push(coder.defaultValue());
  26. });
  27. // We only output named properties for uniquely named coders
  28. const uniqueNames = this.coders.reduce((accum, coder) => {
  29. const name = coder.localName;
  30. if (name) {
  31. if (!accum[name]) { accum[name] = 0; }
  32. accum[name]++;
  33. }
  34. return accum;
  35. }, <{ [ name: string ]: number }>{ });
  36. // Add named values
  37. this.coders.forEach((coder: Coder, index: number) => {
  38. let name = coder.localName;
  39. if (!name || uniqueNames[name] !== 1) { return; }
  40. if (name === "length") { name = "_length"; }
  41. if (values[name] != null) { return; }
  42. values[name] = values[index];
  43. });
  44. return Object.freeze(values);
  45. }
  46. encode(writer: Writer, _value: Array<any> | { [ name: string ]: any } | Typed): number {
  47. const value = Typed.dereference(_value, "tuple");
  48. return pack(writer, this.coders, value);
  49. }
  50. decode(reader: Reader): any {
  51. return unpack(reader, this.coders);
  52. }
  53. }