/**
* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

'use strict';

// MODULES //

var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var Buffer = require( './../../ctor' );


// MAIN //

/**
* Allocates a buffer containing a provided string.
*
* @param {string} str - input string
* @param {string} [encoding="utf8"] - character encoding
* @throws {TypeError} first argument must be a string
* @throws {TypeError} second argument must be a string
* @throws {TypeError} second argument must be a valid encoding
* @returns {Buffer} new `Buffer` instance
*
* @example
* var buf = fromString( 'beep boop' );
* // returns <Buffer>
*/
function fromString( str, encoding ) {
	if ( !isString( str ) ) {
		throw new TypeError( 'invalid argument. First argument must be a string. Value: `' + str + '`' );
	}
	if ( arguments.length > 1 ) {
		if ( !isString( encoding ) ) {
			throw new TypeError( 'invalid argument. Second argument must be a string. Value: `' + encoding + '`' );
		}
		return Buffer.from( str, encoding );
	}
	return Buffer.from( str, 'utf8' );
}


// EXPORTS //

module.exports = fromString;
