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* @license Apache-2.0
*
* Copyright (c) 2020 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 isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
var format = require( '@stdlib/string/format' );
var base = require( '@stdlib/string/base/code-point-at' );
// MAIN //
/**
* Returns a Unicode code point from a string at a specified position.
*
* @param {string} str - input string
* @param {integer} idx - position
* @param {boolean} [backward=false] - backward iteration for low surrogates
* @throws {TypeError} first argument must be a string
* @throws {TypeError} second argument must be an integer
* @throws {TypeError} third argument must be a boolean
* @throws {RangeError} position must be a valid index in string
* @returns {NonNegativeInteger} code point
*
* @example
* var out = codePointAt( 'last man standing', 4 );
* // returns 32
*
* @example
* var out = codePointAt( 'presidential election', 8, true );
* // returns 116
*
* @example
* var out = codePointAt( 'अनुच्छेद', 2 );
* // returns 2369
*
* @example
* var out = codePointAt( '🌷', 1, true );
* // returns 127799
*/
function codePointAt( str, idx, backward ) {
var FLG;
if ( !isString( str ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) );
}
if ( !isInteger( idx ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be an integer. Value: `%s`.', idx ) );
}
if ( idx < 0 ) {
idx += str.length;
}
if ( idx < 0 || idx >= str.length ) {
throw new RangeError( format( 'invalid argument. Second argument must be a valid position (i.e., be within string bounds). Value: `%d`.', idx ) );
}
if ( arguments.length > 2 ) {
if ( !isBoolean( backward ) ) {
throw new TypeError( format( 'invalid argument. Third argument must be a boolean. Value: `%s`.', backward ) );
}
FLG = backward;
} else {
FLG = false;
}
return base( str, idx, FLG );
}
// EXPORTS //
module.exports = codePointAt;
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