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