source: imaps-frontend/node_modules/es-abstract/2018/NumberToRawBytes.js

'use strict';

var $TypeError = require('es-errors/type');

var hasOwnProperty = require('./HasOwnProperty');
var ToInt16 = require('./ToInt16');
var ToInt32 = require('./ToInt32');
var ToInt8 = require('./ToInt8');
var ToUint16 = require('./ToUint16');
var ToUint32 = require('./ToUint32');
var ToUint8 = require('./ToUint8');
var ToUint8Clamp = require('./ToUint8Clamp');

var valueToFloat32Bytes = require('../helpers/valueToFloat32Bytes');
var valueToFloat64Bytes = require('../helpers/valueToFloat64Bytes');
var integerToNBytes = require('../helpers/integerToNBytes');

var keys = require('object-keys');

// https://262.ecma-international.org/8.0/#table-50
var TypeToSizes = {
        __proto__: null,
        Int8: 1,
        Uint8: 1,
        Uint8C: 1,
        Int16: 2,
        Uint16: 2,
        Int32: 4,
        Uint32: 4,
        Float32: 4,
        Float64: 8
};

var TypeToAO = {
        __proto__: null,
        Int8: ToInt8,
        Uint8: ToUint8,
        Uint8C: ToUint8Clamp,
        Int16: ToInt16,
        Uint16: ToUint16,
        Int32: ToInt32,
        Uint32: ToUint32
};

// https://262.ecma-international.org/8.0/#sec-numbertorawbytes

module.exports = function NumberToRawBytes(type, value, isLittleEndian) {
        if (typeof type !== 'string' || !hasOwnProperty(TypeToSizes, type)) {
                throw new $TypeError('Assertion failed: `type` must be a TypedArray element type: ' + keys(TypeToSizes));
        }
        if (typeof value !== 'number') {
                throw new $TypeError('Assertion failed: `value` must be a Number');
        }
        if (typeof isLittleEndian !== 'boolean') {
                throw new $TypeError('Assertion failed: `isLittleEndian` must be a Boolean');
        }

        if (type === 'Float32') { // step 1
                return valueToFloat32Bytes(value, isLittleEndian);
        } else if (type === 'Float64') { // step 2
                return valueToFloat64Bytes(value, isLittleEndian);
        } // step 3

        var n = TypeToSizes[type]; // step 3.a

        var convOp = TypeToAO[type]; // step 3.b

        var intValue = convOp(value); // step 3.c

        return integerToNBytes(intValue, n, isLittleEndian); // step 3.d, 3.e, 4
};