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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.
*/
/* eslint-disable no-underscore-dangle */
'use strict';
// MODULES //
var logger = require( 'debug' );
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
// VARIABLES //
var debug = logger( 'repl:command:assignfrom' );
// MAIN //
/**
* Returns a callback to be invoked upon calling the `assignfrom` command.
*
* @private
* @param {REPL} repl - REPL instance
* @returns {Function} callback
*/
function command( repl ) {
return onCommand;
/**
* Reads a value from a specified workspace.
*
* @private
* @param {string} workspace - workspace name
* @param {(string|symbol)} variable - variable name
* @returns {*} assigned value
*/
function onCommand( workspace, variable ) {
var list;
var desc;
var err;
var i;
if ( !isString( workspace ) ) {
err = new TypeError( 'invalid argument. First argument must be a string. Value: `' + workspace + '`.' );
debug( 'Error: %s', err.message );
repl._ostream.write( 'Error: '+err.message+'\n' );
return;
}
if ( workspace === repl._currentWorkspace ) {
return repl._context[ variable ];
}
if ( !hasOwnProp( repl._workspaces, workspace ) ) {
err = new Error( 'invalid argument. Unrecognized workspace name. Value: `' + workspace + '`.' );
debug( 'Error: %s', err.message );
repl._ostream.write( 'Error: '+err.message+'\n' );
return;
}
list = repl._workspaces[ workspace ];
for ( i = 0; i < list.length; i += 2 ) {
if ( list[ i ] === variable ) {
desc = list[ i+1 ];
// Check if descriptor is an accessor descriptor:
if ( hasOwnProp( desc, 'get' ) ) {
// WARNING: the `this` context is not defined, as the variable is not actually bound to a global instance!
return desc.get.call( null );
}
// Check if the descriptor is a data descriptor:
if ( hasOwnProp( desc, 'value' ) ) {
return desc.value;
}
// Variable must be write-only:
err = new Error( 'invalid operation. Cannot read from write-only variable `'+variable+'`.' );
debug( 'Error: %s', err.message );
repl._ostream.write( 'Error: '+err.message+'\n' );
return;
}
}
}
}
// EXPORTS //
module.exports = command;
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