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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 inspect = require( 'util' ).inspect;
var logger = require( 'debug' );
var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
var replace = require( '@stdlib/string/replace' );
var noop = require( '@stdlib/utils/noop' );
var nextTick = require( '@stdlib/utils/next-tick' );
var displayPrompt = require( './display_prompt.js' );
var updateRegExpCache = require( './update_regexp_cache.js' );
var restoreRegExpMatches = require( './restore_regexp_matches.js' );
// VARIABLES //
var debug = logger( 'repl:drain' );
// MAIN //
/**
* Drains a REPL's command queue.
*
* @private
* @param {REPL} repl - REPL instance
* @returns {void}
*/
function drain( repl ) {
var DONE;
var SYNC;
var opts;
var code;
var res;
var pre;
var tmp;
if ( repl._busy ) {
debug( 'Waiting on a command to finish...' );
return;
}
if ( repl._queue.length === 0 ) {
debug( 'Command queue is empty.' );
if ( !repl._closed ) {
displayPrompt( repl, false );
}
repl.emit( 'drain' );
return;
}
debug( 'Evaluating next command...' );
// Set a flag indicating that the REPL is busy:
repl._busy = true;
// Remove a command from the queue:
code = repl._queue.pop();
debug( 'Command: %s', code.raw );
// Set an internal flag for determining whether a command executes synchronously:
SYNC = true;
// Set the REPL command callback:
repl._done = ( code.async ) ? done : noop;
// Set the (non-standard) properties on the `RegExp` expression object to the cached matches:
restoreRegExpMatches( repl._regexp );
// Evaluate command...
opts = {
'timeout': repl._timeout,
'displayErrors': false,
'breakOnSigint': true // Note: only applies for Node.js versions >=6.3.0
};
try {
if ( repl._sandbox ) {
res = code.compiled.runInContext( repl._context, opts );
} else {
res = code.compiled.runInThisContext( opts );
}
} catch ( error ) {
debug( 'Error: %s', error.message );
repl._ostream.write( 'Error: '+error.message+'\n' );
repl.emit( 'command', code.raw, false ); // command failed
updateRegExpCache( repl._regexp );
repl._busy = false;
displayPrompt( repl, false );
// Clear the command queue, as an error may cause downstream "dependencies" to not be fulfilled, etc:
repl._queue.clear();
return;
}
// If an "asynchronous" command ran synchronously, then initial value of `SYNC` in the `done` callback below will be `true`; here, we reset the flag to ensure that, during the next turn of the event loop, the value is `false`:
SYNC = false;
// If we are running "asynchronous" code, wait until the `__done__` callback is invoked to continue processing...
if ( code.async ) {
return;
}
// Update the cache of saved regular expression substring matches:
updateRegExpCache( repl._regexp );
// Cache the result:
repl._ans = res;
if ( code.silent === false && res !== void 0 ) {
pre = replace( repl._outputPrompt, '%d', (repl._count+1).toString() );
// TODO: pretty printing (can defer to `util.inspect` for now, but will invariably want more control over this later, possibly including default configuration, etc, either at startup, during runtime, or according to an external configuration file)
if ( isndarrayLike( res ) ) {
tmp = res.toString(); // FIXME: this is a hack in order to avoid printing private ndarray properties in the REPL, as done by the built-in `util.inspect`. Ideally, we'd roll our own inspector which specifically accommodates stdlib's ndarray and other specialized classes.
} else {
tmp = repl._ans;
}
repl._ostream.write( pre+inspect( tmp )+'\n' );
}
// Finish processing:
return beforeNextTick();
/**
* Callback invoked when a command finishes.
*
* @private
* @param {(Error|null)} [error] - error
* @param {*} [results] - results
* @returns {void}
*/
function done( error, results ) {
var args;
var i;
if ( DONE ) {
debug( 'Command already finished. Command callback called more than once.' );
if ( error ) {
debug( 'Error: %s', error.message );
}
if ( arguments.length > 1 ) {
debug( 'Results: %s', JSON.stringify( results ) );
}
return;
}
// Update the internal flag indicating whether a command has finished executing (which is important within the context of `SIGINT` event handling):
DONE = true;
// If the command ran synchronously, defer resolution of the results until the next tick of the event loop...
if ( SYNC ) {
debug( 'Asynchronous command executed synchronously.' );
args = [];
for ( i = 0; i < arguments.length; i++ ) {
args.push( arguments[ i ] );
}
nextTick( defer );
return;
}
// Update the cache of saved regular expression substring matches:
updateRegExpCache( repl._regexp );
if ( error ) {
debug( 'Error: %s', error.message );
repl._ostream.write( 'Error: '+error.message+'\n' );
repl.emit( 'command', code.raw, false ); // command failed
displayPrompt( repl, false );
// Indicate that command execution has completed:
repl._busy = false;
// Clear the command queue, as an error may cause downstream "dependencies" to not be fulfilled, etc:
repl._queue.clear();
return;
}
// Cache the result:
repl._ans = [ res, results ];
if ( code.silent === false && ( res !== void 0 || results !== void 0 ) ) { // eslint-disable-line max-len
pre = replace( repl._outputPrompt, '%d', (repl._count+1).toString() );
// TODO: pretty printing (can defer to `util.inspect` for now, but will invariably want more control over this later, possibly including default configuration, etc, either at startup, during runtime, or according to an external configuration file)
repl._ostream.write( pre+inspect( repl._ans )+'\n' );
}
// Finish processing:
beforeNextTick();
/**
* Callback invoked upon the next tick of the event loop.
*
* @private
*/
function defer() {
done.apply( null, args );
}
}
/**
* Initiates common processing steps before the next tick of the event loop.
*
* @private
*/
function beforeNextTick() {
// Announce that the command succeeded:
debug( 'Finished evaluating command.' );
repl.emit( 'command', code.raw, true );
nextTick( onTick );
}
/**
* Callback invoked upon the next tick of the event loop.
*
* @private
*/
function onTick() {
// Indicate that command execution has completed:
repl._busy = false;
drain( repl );
}
}
// EXPORTS //
module.exports = drain;
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