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45 lines
1.2 KiB
45 lines
1.2 KiB
'use strict'; |
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var toStr = Object.prototype.toString; |
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var isPrimitive = require('./helpers/isPrimitive'); |
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var isCallable = require('is-callable'); |
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// http://ecma-international.org/ecma-262/5.1/#sec-8.12.8 |
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var ES5internalSlots = { |
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'[[DefaultValue]]': function (O) { |
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var actualHint; |
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if (arguments.length > 1) { |
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actualHint = arguments[1]; |
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} else { |
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actualHint = toStr.call(O) === '[object Date]' ? String : Number; |
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} |
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if (actualHint === String || actualHint === Number) { |
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var methods = actualHint === String ? ['toString', 'valueOf'] : ['valueOf', 'toString']; |
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var value, i; |
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for (i = 0; i < methods.length; ++i) { |
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if (isCallable(O[methods[i]])) { |
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value = O[methods[i]](); |
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if (isPrimitive(value)) { |
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return value; |
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} |
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} |
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} |
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throw new TypeError('No default value'); |
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} |
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throw new TypeError('invalid [[DefaultValue]] hint supplied'); |
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} |
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}; |
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// http://ecma-international.org/ecma-262/5.1/#sec-9.1 |
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module.exports = function ToPrimitive(input) { |
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if (isPrimitive(input)) { |
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return input; |
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} |
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if (arguments.length > 1) { |
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return ES5internalSlots['[[DefaultValue]]'](input, arguments[1]); |
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} |
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return ES5internalSlots['[[DefaultValue]]'](input); |
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};
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