/**
* @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:assignin' );


// MAIN //

/**
* Returns a callback to be invoked upon calling the `assignin` command.
*
* @private
* @param {REPL} repl - REPL instance
* @returns {Function} callback
*/
function command( repl ) {
	return onCommand;

	/**
	* Assigns a value to a variable in a specified workspace.
	*
	* @private
	* @param {string} workspace - workspace name
	* @param {(string|symbol)} variable - variable name
	* @param {*} value - value to assign
	* @returns {void}
	*/
	function onCommand( workspace, variable, value ) {
		var list;
		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 ) {
			repl._context[ variable ] = value;
			return;
		}
		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 ) {
				// Update variable:
				list[ i+1 ] = value;
				return;
			}
		}
		// Create variable:
		list.push( variable, value );
	}
}


// EXPORTS //

module.exports = command;

@@ -1436,16 +1436,28 @@
 r list;%0A
+%09%09var desc;%0A
 %09%09var er
@@ -2205,125 +2205,986 @@
 %09%09%09%09
-// Update variable:%0A%09%09%09%09list%5B i+1 %5D = value;%0A%09%09%09%09return;%0A%09%09%09%7D%0A%09%09%7D%0A%09%09// Create variable:%0A%09%09list.push( variable, value 
+desc = list%5B i+1 %5D;%0A%0A%09%09%09%09// Check if descriptor has a setter:%0A%09%09%09%09if ( typeof desc.set === 'function' ) %7B%0A%09%09%09%09%09// WARNING: the %60this%60 context is not defined, as the variable is not actually bound to a global instance!%0A%09%09%09%09%09desc.set.call( null, value );%0A%09%09%09%09%09return;%0A%09%09%09%09%7D%0A%09%09%09%09// Check if the variable is read-only:%0A%09%09%09%09if ( typeof desc.get === 'function' %7C%7C desc.writable === false ) %7B%0A%09%09%09%09%09err = new Error( 'Cannot assign to read only property '+variable+' of object #%3CObject%3E' ); // Note: this mirrors the built-in environment error message%0A%09%09%09%09%09debug( 'Error: %25s', err.message );%0A%09%09%09%09%09repl._ostream.write( 'Error: '+err.message+'%5Cn' );%0A%09%09%09%09%09return;%0A%09%09%09%09%7D%0A%09%09%09%09desc.value = value;%0A%09%09%09%09return;%0A%09%09%09%7D%0A%09%09%7D%0A%09%09// Create a workspace variable by defining a property descriptor equivalent to when a user defines a variable within a global context (e.g., %60var x = 3.14%60):%0A%09%09list.push( variable, %7B%0A%09%09%09'configurable': true,%0A%09%09%09'enumerable': true,%0A%09%09%09'writable': true,%0A%09%09%09'value': value%0A%09%09%7D
 );%0A%09

Define or update a workspace variable property descriptor