80 lines
2.3 KiB
JavaScript
80 lines
2.3 KiB
JavaScript
/**
|
|
* @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 IS_NODE = require( './../../is-node' );
|
|
var p = require( './parent.js' );
|
|
var stacktrace = require( './stacktrace.js' );
|
|
|
|
|
|
// VARIABLES //
|
|
|
|
// The module id for the builtin REPL was `repl` in Node versions <4 and then changed to `<repl>` for Node versions >=4 (see https://github.com/nodejs/node/commit/ee72ee753118f2576bfd1ccf58fb2ff651e8bfb0#diff-b13d72249263845d8e8341db0426f9d3R527).
|
|
var RE_MODULE_ID = /^repl$|^<repl>$/;
|
|
|
|
// This is V8 specific (!!), as this assumes the V8 stacktrace API. TODO: rely on an engine agnostic approach to determining callsites.
|
|
var RE_ERROR_STACK = /at REPLServer/;
|
|
|
|
|
|
// MAIN //
|
|
|
|
/**
|
|
* Returns a boolean indicating if the function is called from a Node.js REPL environment.
|
|
*
|
|
* ## Notes
|
|
*
|
|
* - False positives are possible due to the existence of a userland package having the same module `id` (see [repl][repl-template-lib]) as the builtin Node.js `repl`.
|
|
*
|
|
* [repl-template-lib]: https://www.npmjs.com/package/repl
|
|
*
|
|
* @returns {boolean} boolean indicating if the function is called from a Node.js REPL environment
|
|
*
|
|
* @example
|
|
* var bool = isNodeREPL();
|
|
* // returns <boolean>
|
|
*/
|
|
function isNodeREPL() {
|
|
var stack;
|
|
var m;
|
|
if ( !IS_NODE ) {
|
|
return false;
|
|
}
|
|
// If this module was required in a REPL environment, we can walk up the module dependency tree to find a `repl` ancestor...
|
|
m = p();
|
|
while ( m ) {
|
|
if ( RE_MODULE_ID.test( m.id ) ) {
|
|
return true;
|
|
}
|
|
m = m.parent;
|
|
}
|
|
// Unable to find a `repl` ancestor, so try determining if this function was called from a REPL environment...
|
|
stack = stacktrace();
|
|
if ( stack ) {
|
|
return RE_ERROR_STACK.test( stack );
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
// EXPORTS //
|
|
|
|
module.exports = isNodeREPL;
|