Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* @license Apache-2.0
*
* Copyright (c) 2022 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 setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var isFunction = require( '@stdlib/assert/is-function' );
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var iteratorSymbol = require( '@stdlib/symbol/iterator' );
var prevGraphemeClusterBreak = require( '@stdlib/string/prev-grapheme-cluster-break' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns an iterator which iterates from right to left over each grapheme cluster in a string.
*
* @param {string} src - input value
* @param {Function} [mapFcn] - function to invoke for each iterated value
* @param {*} [thisArg] - execution context
* @throws {TypeError} first argument must be a string
* @throws {TypeError} second argument must be a function
* @returns {Iterator} iterator
*
* @example
* var iter = graphemeClusters2iteratorRight( '🌷🍕' );
*
* var v = iter.next().value;
* // returns '🍕'
*
* v = iter.next().value;
* // returns '🌷'
*
* var bool = iter.next().done;
* // returns true
*/
function graphemeClusters2iteratorRight( src ) { // eslint-disable-line id-length
var thisArg;
var iter;
var FLG;
var fcn;
var i;
if ( !isString( src ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', src ) );
}
if ( arguments.length > 1 ) {
fcn = arguments[ 1 ];
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a function. Value: `%s`.', fcn ) );
}
thisArg = arguments[ 2 ];
}
i = src.length - 1;
// Create an iterator protocol-compliant object:
iter = {};
if ( fcn ) {
setReadOnly( iter, 'next', next1 );
} else {
setReadOnly( iter, 'next', next2 );
}
setReadOnly( iter, 'return', end );
// If an environment supports `Symbol.iterator`, make the iterator iterable:
if ( iteratorSymbol ) {
setReadOnly( iter, iteratorSymbol, factory );
}
return iter;
/**
* Returns an iterator protocol-compliant object containing the next iterated value.
*
* @private
* @returns {Object} iterator protocol-compliant object
*/
function next1() {
var v;
var j;
if ( FLG ) {
return {
'done': true
};
}
j = prevGraphemeClusterBreak( src, i );
if ( j === -1 ) {
FLG = true;
if ( src.length ) {
return {
'value': fcn.call( thisArg, src.substring( j+1, i+1 ), j+1, src ),
'done': false
};
}
return {
'done': true
};
}
v = fcn.call( thisArg, src.substring( j+1, i+1 ), j+1, src );
i = j;
return {
'value': v,
'done': false
};
}
/**
* Returns an iterator protocol-compliant object containing the next iterated value.
*
* @private
* @returns {Object} iterator protocol-compliant object
*/
function next2() {
var v;
var j;
if ( FLG ) {
return {
'done': true
};
}
j = prevGraphemeClusterBreak( src, i );
if ( j === -1 ) {
FLG = true;
if ( src.length ) {
return {
'value': src.substring( j+1, i+1 ),
'done': false
};
}
return {
'done': true
};
}
v = src.substring( j+1, i+1 );
i = j;
return {
'value': v,
'done': false
};
}
/**
* Finishes an iterator.
*
* @private
* @param {*} [value] - value to return
* @returns {Object} iterator protocol-compliant object
*/
function end( value ) {
FLG = true;
if ( arguments.length ) {
return {
'value': value,
'done': true
};
}
return {
'done': true
};
}
/**
* Returns a new iterator.
*
* @private
* @returns {Iterator} iterator
*/
function factory() {
if ( fcn ) {
return graphemeClusters2iteratorRight( src, fcn, thisArg );
}
return graphemeClusters2iteratorRight( src );
}
}
// EXPORTS //
module.exports = graphemeClusters2iteratorRight;
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