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* @license Apache-2.0
*
* Copyright (c) 2019 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 Module = require( 'module' );
var vm = require( 'vm' );
var Console = require( 'console' ).Console;
var getGlobal = require( '@stdlib/utils/global' );
var objectKeys = require( '@stdlib/utils/keys' );
var setReadOnly = require( '@stdlib/utils/define-read-only-property' );
var setConfigurableReadOnly = require( '@stdlib/utils/define-configurable-read-only-property' );
var GLOBALS = require( './globals.js' );
var createRequire = require( './create_require.js' );
// VARIABLES //
// Cache references to module methods (WARNING: use of *private* methods exposed on the `Module` object; thus, breakage is possible!):
var resolveLookupPaths = Module._resolveLookupPaths; // eslint-disable-line no-underscore-dangle
// MAIN //
/**
* Creates a REPL evaluation context.
*
* @private
* @param {Array} out - strided output array for storing variables added to the evaluation context
* @param {Stream} ostream - output stream
* @param {boolean} sandbox - boolean indicating whether the evaluation context should be "sandboxed"
* @returns {Object} context
*/
function createContext( out, ostream, sandbox ) {
var context;
var keys;
var i;
// Create the REPL context...
if ( sandbox ) {
// Create a sandboxed context:
context = vm.createContext();
// Assign globals from the current global context to the sandboxed context (note: shallow copy!)...
keys = objectKeys( GLOBALS );
for ( i = 0; i < keys.length; i++ ) {
setReadOnly( context, keys[ i ], GLOBALS[ keys[ i ] ] );
}
// Create a circular reference as in Node.js:
setReadOnly( context, 'global', context );
// Create a new `console` interface:
setReadOnly( context, 'console', new Console( ostream ) );
// Create a new `module` object:
setReadOnly( context, 'module', new Module( '<repl>' ) );
// Create a new `require` function:
setReadOnly( context, 'require', createRequire( context.module ) );
} else {
context = getGlobal(); // current global variable
// Create a new `module` object:
setConfigurableReadOnly( context, 'module', new Module( '<repl>' ) );
// Create a new `require` function:
setConfigurableReadOnly( context, 'require', createRequire( context.module ) );
}
context.module.paths = resolveLookupPaths( '<repl>', module, true ) || [];
out.push( 'global', context.global );
out.push( 'require', context.require );
return context;
}
// EXPORTS //
module.exports = createContext;
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