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37 lines
848 B
37 lines
848 B
3 months ago
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'use strict';
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const isBsonType = require('../helpers/isBsonType');
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const assert = require('assert');
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/**
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* Given a value, cast it to a Int32, or throw an `Error` if the value
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* cannot be casted. `null` and `undefined` are considered valid.
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*
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* @param {Any} value
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* @return {Number}
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* @throws {Error} if `value` does not represent an integer, or is outside the bounds of an 32-bit integer.
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* @api private
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*/
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module.exports = function castInt32(val) {
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if (val == null) {
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return val;
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}
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if (val === '') {
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return null;
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}
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const coercedVal = isBsonType(val, 'Long') ? val.toNumber() : Number(val);
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const INT32_MAX = 0x7FFFFFFF;
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const INT32_MIN = -0x80000000;
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if (coercedVal === (coercedVal | 0) &&
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coercedVal >= INT32_MIN &&
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coercedVal <= INT32_MAX
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) {
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return coercedVal;
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}
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assert.ok(false);
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};
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