1 | 'use strict';
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2 |
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3 | var hasSymbols = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol';
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4 |
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5 | var isPrimitive = require('./helpers/isPrimitive');
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6 | var isCallable = require('is-callable');
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7 | var isDate = require('is-date-object');
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8 | var isSymbol = require('is-symbol');
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9 |
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10 | var ordinaryToPrimitive = function OrdinaryToPrimitive(O, hint) {
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11 | if (typeof O === 'undefined' || O === null) {
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12 | throw new TypeError('Cannot call method on ' + O);
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13 | }
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14 | if (typeof hint !== 'string' || (hint !== 'number' && hint !== 'string')) {
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15 | throw new TypeError('hint must be "string" or "number"');
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16 | }
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17 | var methodNames = hint === 'string' ? ['toString', 'valueOf'] : ['valueOf', 'toString'];
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18 | var method, result, i;
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19 | for (i = 0; i < methodNames.length; ++i) {
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20 | method = O[methodNames[i]];
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21 | if (isCallable(method)) {
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22 | result = method.call(O);
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23 | if (isPrimitive(result)) {
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24 | return result;
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25 | }
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26 | }
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27 | }
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28 | throw new TypeError('No default value');
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29 | };
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30 |
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31 | var GetMethod = function GetMethod(O, P) {
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32 | var func = O[P];
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33 | if (func !== null && typeof func !== 'undefined') {
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34 | if (!isCallable(func)) {
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35 | throw new TypeError(func + ' returned for property ' + P + ' of object ' + O + ' is not a function');
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36 | }
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37 | return func;
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38 | }
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39 | return void 0;
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40 | };
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41 |
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42 |
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43 | module.exports = function ToPrimitive(input) {
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44 | if (isPrimitive(input)) {
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45 | return input;
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46 | }
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47 | var hint = 'default';
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48 | if (arguments.length > 1) {
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49 | if (arguments[1] === String) {
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50 | hint = 'string';
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51 | } else if (arguments[1] === Number) {
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52 | hint = 'number';
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53 | }
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54 | }
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55 |
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56 | var exoticToPrim;
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57 | if (hasSymbols) {
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58 | if (Symbol.toPrimitive) {
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59 | exoticToPrim = GetMethod(input, Symbol.toPrimitive);
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60 | } else if (isSymbol(input)) {
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61 | exoticToPrim = Symbol.prototype.valueOf;
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62 | }
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63 | }
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64 | if (typeof exoticToPrim !== 'undefined') {
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65 | var result = exoticToPrim.call(input, hint);
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66 | if (isPrimitive(result)) {
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67 | return result;
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68 | }
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69 | throw new TypeError('unable to convert exotic object to primitive');
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70 | }
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71 | if (hint === 'default' && (isDate(input) || isSymbol(input))) {
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72 | hint = 'string';
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73 | }
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74 | return ordinaryToPrimitive(input, hint === 'default' ? 'number' : hint);
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75 | };
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