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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 isError = require( '@stdlib/assert/is-error' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Wraps a function in a try/catch block.
*
* @param {Function} fcn - function to wrap
* @param {*} [thisArg] - function context
* @throws {TypeError} must provide a function
* @returns {Function} wrapped function
*
* @example
* function fcn() {
* throw new Error( 'beep boop' );
* }
*
* var f = wrap( fcn );
*
* var out = f();
* if ( out instanceof Error ) {
* console.error( out.message );
* // => 'beep boop'
* }
*/
function wrap( fcn, thisArg ) {
var ctx;
if ( !isFunction( fcn ) ) {
throw new TypeError( format( 'invalid argument. Must provide a function. Value: `%s`.', fcn ) );
}
if ( arguments.length > 1 ) {
ctx = thisArg;
} else {
ctx = null;
}
return wrapped;
/**
* Wrapped function.
*
* @private
* @param {...*} [args] - function arguments
* @returns {(*|Error)} returned value or an error object
*/
function wrapped() {
var args;
var len;
var i;
len = arguments.length;
args = [];
for ( i = 0; i < len; i++ ) {
args.push( arguments[ i ] );
}
try {
return fcn.apply( ctx, args );
} catch ( error ) {
if ( isError( error ) ) {
return error;
}
// Handle thrown literals...
if ( typeof error === 'object' ) {
return new Error( JSON.stringify( error ) );
}
return new Error( error.toString() );
}
}
}
// EXPORTS //
module.exports = wrap;
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