Press n or j to go to the next uncovered block, b, p or k for the previous block.
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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' );
var format = require( '@stdlib/string/format' );
// 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 desc;
var err;
var i;
if ( !isString( workspace ) ) {
err = new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', 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( format( 'invalid argument. Unrecognized workspace name. Value: `%s`.', 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 has a setter:
if ( typeof desc.set === 'function' ) {
// WARNING: the `this` context is not defined, as the variable is not actually bound to a global instance!
desc.set.call( null, value );
return;
}
// Check if the variable is read-only:
if ( typeof desc.get === 'function' || desc.writable === false ) {
err = new Error( format( 'Cannot assign to read only property %s of object #<Object>', variable ) ); // Note: this mirrors the built-in environment error message
debug( 'Error: %s', err.message );
repl._ostream.write( 'Error: '+err.message+'\n' );
return;
}
desc.value = value;
return;
}
}
// Create a workspace variable by defining a property descriptor equivalent to when a user defines a variable within a global context (e.g., `var x = 3.14`):
list.push( variable, {
'configurable': true,
'enumerable': true,
'writable': true,
'value': value
});
}
}
// EXPORTS //
module.exports = command;
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