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 vm = require( 'vm' );
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' );
var updateRegExpCache = require( './../update_regexp_cache.js' );
var restoreRegExpMatches = require( './../restore_regexp_matches.js' );
// VARIABLES //
var debug = logger( 'repl:command:evalin' );
var RE_WHITESPACE = /^\s*$/;
// MAIN //
/**
* Returns a callback to be invoked upon calling the `evalin` command.
*
* @private
* @param {REPL} repl - REPL instance
* @returns {Function} callback
*/
function command( repl ) {
return onCommand;
/**
* Evaluates an expression in a specified workspace.
*
* @private
* @param {string} workspace - workspace name
* @param {string} expression - expression to evaluate
* @returns {void}
*/
function onCommand( workspace, expression ) {
var script;
var opts;
var err;
var FLG;
var ws;
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 ( !isString( expression ) ) {
err = new TypeError( format( 'invalid argument. Second argument must be a string. Value: `%s`.', workspace ) );
debug( 'Error: %s', err.message );
repl._ostream.write( 'Error: '+err.message+'\n' );
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;
}
if ( RE_WHITESPACE.test( expression ) ) {
debug( 'Expression only consists of whitespace. Nothing to evaluate.' );
return;
}
// Cache the name of the current workspace:
ws = repl._currentWorkspace;
// Temporarily silence logging:
FLG = repl._quiet;
repl._quiet = true;
// Switch to the target workspace:
repl._context.workspace( workspace );
// Try evaluating the expression...
opts = {
'filename': '<repl>',
'lineOffset': 0
};
try {
// FIXME: this needs to follow the same logic as `process_line`, such as code wrapping, asynchronous execution, and handling top-level `await`!!!
script = new vm.Script( expression, opts );
} catch ( error ) {
debug( 'Error: %s', error.message );
repl._ostream.write( 'Error: '+error.message+'\n' );
repl._context.workspace( ws );
repl._quiet = FLG;
return;
}
// Set the (non-standard) properties on the `RegExp` expression object to the cached matches:
restoreRegExpMatches( repl._regexp );
opts = {
'timeout': repl._timeout,
'displayErrors': false,
'breakOnSigint': true // Note: only applies for Node.js versions >=6.3.0
};
// FIXME: we need to follow similar logic as `drain.js`, such as SIGINT handling!!!
try {
script.runInContext( repl._context, opts );
repl._ostream.write( 'Successfully evaluated expression.\n' );
} catch ( error ) {
debug( 'Error: %s', error.message );
repl._ostream.write( 'Error: '+error.message+'\n' );
}
updateRegExpCache( repl._regexp );
// Return to the previous workspace:
repl._context.workspace( ws );
// Re-enable logging (if enabled):
repl._quiet = FLG;
}
}
// EXPORTS //
module.exports = command;
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