You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
76 lines
2.1 KiB
76 lines
2.1 KiB
4 years ago
|
'use strict';
|
||
|
|
|
||
|
|
var hasSymbols = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol';
|
||
|
|
|
||
|
|
var isPrimitive = require('./helpers/isPrimitive');
|
||
|
|
var isCallable = require('is-callable');
|
||
|
|
var isDate = require('is-date-object');
|
||
|
|
var isSymbol = require('is-symbol');
|
||
|
|
|
||
|
|
var ordinaryToPrimitive = function OrdinaryToPrimitive(O, hint) {
|
||
|
|
if (typeof O === 'undefined' || O === null) {
|
||
|
|
throw new TypeError('Cannot call method on ' + O);
|
||
|
|
}
|
||
|
|
if (typeof hint !== 'string' || (hint !== 'number' && hint !== 'string')) {
|
||
|
|
throw new TypeError('hint must be "string" or "number"');
|
||
|
|
}
|
||
|
|
var methodNames = hint === 'string' ? ['toString', 'valueOf'] : ['valueOf', 'toString'];
|
||
|
|
var method, result, i;
|
||
|
|
for (i = 0; i < methodNames.length; ++i) {
|
||
|
|
method = O[methodNames[i]];
|
||
|
|
if (isCallable(method)) {
|
||
|
|
result = method.call(O);
|
||
|
|
if (isPrimitive(result)) {
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
throw new TypeError('No default value');
|
||
|
|
};
|
||
|
|
|
||
|
|
var GetMethod = function GetMethod(O, P) {
|
||
|
|
var func = O[P];
|
||
|
|
if (func !== null && typeof func !== 'undefined') {
|
||
|
|
if (!isCallable(func)) {
|
||
|
|
throw new TypeError(func + ' returned for property ' + P + ' of object ' + O + ' is not a function');
|
||
|
|
}
|
||
|
|
return func;
|
||
|
|
}
|
||
|
|
return void 0;
|
||
|
|
};
|
||
|
|
|
||
|
|
// http://www.ecma-international.org/ecma-262/6.0/#sec-toprimitive
|
||
|
|
module.exports = function ToPrimitive(input) {
|
||
|
|
if (isPrimitive(input)) {
|
||
|
|
return input;
|
||
|
|
}
|
||
|
|
var hint = 'default';
|
||
|
|
if (arguments.length > 1) {
|
||
|
|
if (arguments[1] === String) {
|
||
|
|
hint = 'string';
|
||
|
|
} else if (arguments[1] === Number) {
|
||
|
|
hint = 'number';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
var exoticToPrim;
|
||
|
|
if (hasSymbols) {
|
||
|
|
if (Symbol.toPrimitive) {
|
||
|
|
exoticToPrim = GetMethod(input, Symbol.toPrimitive);
|
||
|
|
} else if (isSymbol(input)) {
|
||
|
|
exoticToPrim = Symbol.prototype.valueOf;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (typeof exoticToPrim !== 'undefined') {
|
||
|
|
var result = exoticToPrim.call(input, hint);
|
||
|
|
if (isPrimitive(result)) {
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
throw new TypeError('unable to convert exotic object to primitive');
|
||
|
|
}
|
||
|
|
if (hint === 'default' && (isDate(input) || isSymbol(input))) {
|
||
|
|
hint = 'string';
|
||
|
|
}
|
||
|
|
return ordinaryToPrimitive(input, hint === 'default' ? 'number' : hint);
|
||
|
|
};
|