98 lines
2.1 KiB
JavaScript
98 lines
2.1 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isFunction = require( '@stdlib/assert/is-function' );
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var isError = require( '@stdlib/assert/is-error' );
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// MAIN //
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/**
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* Wraps a function in a try/catch block.
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*
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* @param {Function} fcn - function to wrap
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* @param {*} [thisArg] - function context
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* @throws {TypeError} must provide a function
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* @returns {Function} wrapped function
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*
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* @example
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* function fcn() {
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* throw new Error( 'beep boop' );
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* }
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*
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* var f = wrap( fcn );
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*
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* var out = f();
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* if ( out instanceof Error ) {
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* console.error( out.message );
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* // => 'beep boop'
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* }
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*/
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function wrap( fcn, thisArg ) {
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var ctx;
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if ( !isFunction( fcn ) ) {
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throw new TypeError( 'invalid argument. Must provide a function. Value: `' + fcn + '`.' );
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}
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if ( arguments.length > 1 ) {
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ctx = thisArg;
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} else {
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ctx = null;
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}
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return wrapped;
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/**
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* Wrapped function.
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*
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* @private
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* @param {...*} [args] - function arguments
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* @returns {*|Error} returned value or an error object
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*/
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function wrapped() {
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var args;
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var len;
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var i;
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len = arguments.length;
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args = new Array( len );
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for ( i = 0; i < len; i++ ) {
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args[ i ] = arguments[ i ];
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}
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try {
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return fcn.apply( ctx, args );
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} catch ( error ) {
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if ( isError( error ) ) {
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return error;
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}
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// Handle thrown literals...
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if ( typeof error === 'object' ) {
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return new Error( JSON.stringify( error ) );
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}
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return new Error( error.toString() );
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}
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}
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}
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// EXPORTS //
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module.exports = wrap;
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