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* @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 isFunction = require( '@stdlib/assert/is-function' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Invokes a function while a test condition is true.
*
* @param {Function} fcn - function to invoke
* @param {Function} predicate - function which indicates whether to continue invoking a function
* @param {Callback} done - callback to invoke upon completion
* @param {*} [thisArg] - execution context for the invoked function
* @throws {TypeError} first argument must be a function
* @throws {TypeError} second argument must be a function
* @throws {TypeError} third argument must be a function
*
* @example
* function fcn( i, next ) {
* setTimeout( onTimeout, i );
* function onTimeout() {
* console.log( 'beep: %d', i );
* next();
* }
* }
*
* function predicate( i, clbk ) {
* clbk( null, i < 5 );
* }
*
* function done( error ) {
* if ( error ) {
* throw error;
* }
* }
*
* doWhileAsync( fcn, predicate, done );
*/
function doWhileAsync( fcn, predicate, done, thisArg ) {
var args;
var idx;
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a function. Value: `%s`.', fcn ) );
}
if ( !isFunction( predicate ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a function. Value: `%s`.', predicate ) );
}
if ( !isFunction( done ) ) {
throw new TypeError( format( 'invalid argument. Third argument must be a function. Value: `%s`.', done ) );
}
args = [];
idx = 0;
fcn.call( thisArg, idx, next );
/**
* Callback invoked upon completion of a provided function.
*
* @private
* @param {(Error|null)} error - error object
* @param {...*} results - function results
* @returns {void}
*/
function next( error ) {
var i;
if ( error ) {
return done( error );
}
idx += 1;
// Cache the most recent results...
if ( arguments.length > 1 ) {
args = new Array( arguments.length-1 );
for ( i = 1; i < arguments.length; i++ ) {
args[ i-1 ] = arguments[ i ];
}
}
// Run the test condition:
predicate( idx, onPredicate );
}
/**
* Callback invoked upon a predicate result.
*
* @private
* @param {(Error|null)} error - error object
* @param {boolean} result - predicate result
* @returns {void}
*/
function onPredicate( error, result ) {
if ( error ) {
return done( error );
}
if ( result ) {
return fcn.call( thisArg, idx, next );
}
if ( args.length ) {
args.unshift( null ); // error argument
}
done.apply( null, args );
}
}
// EXPORTS //
module.exports = doWhileAsync;
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