diff options
Diffstat (limited to 'deps/npm/node_modules/es-to-primitive/es2015.js')
-rw-r--r-- | deps/npm/node_modules/es-to-primitive/es2015.js | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/deps/npm/node_modules/es-to-primitive/es2015.js b/deps/npm/node_modules/es-to-primitive/es2015.js new file mode 100644 index 0000000000..4a11a346c6 --- /dev/null +++ b/deps/npm/node_modules/es-to-primitive/es2015.js @@ -0,0 +1,75 @@ +'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); +}; |