12620215070647800e1064bc777ee25250bea70439bbd296be89af25bc948562fbbc310e74c2f974e5aadd3427efb7e5914c919f29d319a2d988dc750d7a6b 3.0 KB

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  1. 'use strict';
  2. var $RangeError = require('es-errors/range');
  3. var $TypeError = require('es-errors/type');
  4. var isTypedArray = require('is-typed-array');
  5. var typedArrayBuffer = require('typed-array-buffer');
  6. var typedArrayByteOffset = require('typed-array-byte-offset');
  7. var typedArrayLength = require('typed-array-length');
  8. var whichTypedArray = require('which-typed-array');
  9. var isInteger = require('math-intrinsics/isInteger');
  10. var Get = require('./Get');
  11. var IsBigIntElementType = require('./IsBigIntElementType');
  12. var IsDetachedBuffer = require('./IsDetachedBuffer');
  13. var LengthOfArrayLike = require('./LengthOfArrayLike');
  14. var SetValueInBuffer = require('./SetValueInBuffer');
  15. var ToBigInt = require('./ToBigInt');
  16. var ToNumber = require('./ToNumber');
  17. var ToObject = require('./ToObject');
  18. var ToString = require('./ToString');
  19. var tableTAO = require('./tables/typed-array-objects');
  20. // https://262.ecma-international.org/12.0/#sec-settypedarrayfromarraylike
  21. module.exports = function SetTypedArrayFromArrayLike(target, targetOffset, source) {
  22. var whichTarget = whichTypedArray(target);
  23. if (!whichTarget) {
  24. throw new $TypeError('Assertion failed: target must be a TypedArray instance');
  25. }
  26. if (targetOffset !== Infinity && (!isInteger(targetOffset) || targetOffset < 0)) {
  27. throw new $TypeError('Assertion failed: targetOffset must be a non-negative integer or +Infinity');
  28. }
  29. if (isTypedArray(source)) {
  30. throw new $TypeError('Assertion failed: source must not be a TypedArray instance'); // step 1
  31. }
  32. var targetBuffer = typedArrayBuffer(target); // step 2
  33. if (IsDetachedBuffer(targetBuffer)) {
  34. throw new $TypeError('target’s buffer is detached'); // step 3
  35. }
  36. var targetLength = typedArrayLength(target); // step 4
  37. var targetName = whichTarget; // step 5
  38. var targetType = tableTAO.name['$' + targetName]; // step 7
  39. var targetElementSize = tableTAO.size['$' + targetType]; // step 6
  40. var targetByteOffset = typedArrayByteOffset(target); // step 8
  41. var src = ToObject(source); // step 9
  42. var srcLength = LengthOfArrayLike(src); // step 10
  43. if (targetOffset === Infinity) {
  44. throw new $RangeError('targetOffset must be a finite integer'); // step 11
  45. }
  46. if (srcLength + targetOffset > targetLength) {
  47. throw new $RangeError('targetOffset + srcLength must be <= target.length'); // step 12
  48. }
  49. var targetByteIndex = (targetOffset * targetElementSize) + targetByteOffset; // step 13
  50. var k = 0; // step 14
  51. var limit = targetByteIndex + (targetElementSize * srcLength); // step 15
  52. while (targetByteIndex < limit) { // step 16
  53. var Pk = ToString(k); // step 16.a
  54. var value = Get(src, Pk); // step 16.b
  55. if (IsBigIntElementType(targetType)) {
  56. value = ToBigInt(value); // step 16.c
  57. } else {
  58. value = ToNumber(value); // step 16.d
  59. }
  60. if (IsDetachedBuffer(targetBuffer)) {
  61. throw new $TypeError('target’s buffer is detached'); // step 16.e
  62. }
  63. SetValueInBuffer(targetBuffer, targetByteIndex, targetType, value, true, 'Unordered'); // step 16.f
  64. k += 1; // step 16.g
  65. targetByteIndex += targetElementSize; // step 16.h
  66. }
  67. };