AbstractEqualityComparison.js 1.9 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556
  1. 'use strict';
  2. var StrictEqualityComparison = require('./StrictEqualityComparison');
  3. var StringToBigInt = require('./StringToBigInt');
  4. var ToNumber = require('./ToNumber');
  5. var ToPrimitive = require('./ToPrimitive');
  6. var Type = require('./Type');
  7. var isNaN = require('math-intrinsics/isNaN');
  8. var isObject = require('../helpers/isObject');
  9. // https://262.ecma-international.org/11.0/#sec-abstract-equality-comparison
  10. module.exports = function AbstractEqualityComparison(x, y) {
  11. if (Type(x) === Type(y)) {
  12. return StrictEqualityComparison(x, y);
  13. }
  14. if (x == null && y == null) {
  15. return true;
  16. }
  17. if (typeof x === 'number' && typeof y === 'string') {
  18. return AbstractEqualityComparison(x, ToNumber(y));
  19. }
  20. if (typeof x === 'string' && typeof y === 'number') {
  21. return AbstractEqualityComparison(ToNumber(x), y);
  22. }
  23. if (typeof x === 'bigint' && typeof y === 'string') {
  24. var n = StringToBigInt(y);
  25. if (isNaN(n)) {
  26. return false;
  27. }
  28. return AbstractEqualityComparison(x, n);
  29. }
  30. if (typeof x === 'string' && typeof y === 'bigint') {
  31. return AbstractEqualityComparison(y, x);
  32. }
  33. if (typeof x === 'boolean') {
  34. return AbstractEqualityComparison(ToNumber(x), y);
  35. }
  36. if (typeof y === 'boolean') {
  37. return AbstractEqualityComparison(x, ToNumber(y));
  38. }
  39. if ((typeof x === 'string' || typeof x === 'number' || typeof x === 'bigint' || typeof x === 'symbol') && isObject(y)) {
  40. return AbstractEqualityComparison(x, ToPrimitive(y));
  41. }
  42. if (isObject(x) && (typeof y === 'string' || typeof y === 'number' || typeof y === 'bigint' || typeof y === 'symbol')) {
  43. return AbstractEqualityComparison(ToPrimitive(x), y);
  44. }
  45. if ((typeof x === 'bigint' && typeof y === 'number') || (typeof x === 'number' && typeof y === 'bigint')) {
  46. if (isNaN(x) || isNaN(y) || x === Infinity || y === Infinity || x === -Infinity || y === -Infinity) {
  47. return false;
  48. }
  49. return x == y; // eslint-disable-line eqeqeq
  50. }
  51. return false;
  52. };