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repl: minor improvements #25731

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repl: minor improvements #25731

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9c668c2
repl: simplify and improve completion
BridgeAR Jan 25, 2019
0542890
repl: fix eval return value
BridgeAR Jan 27, 2019
240388c
repl: remove obsolete buffer clearing
BridgeAR Jan 27, 2019
12a3e4d
test: remove obsolete code
BridgeAR Jan 27, 2019
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58 changes: 17 additions & 41 deletions lib/repl.js
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Original file line number Diff line number Diff line change
Expand Up @@ -89,18 +89,6 @@ let processTopLevelAwait;
const parentModule = module;
const replMap = new WeakMap();

const GLOBAL_OBJECT_PROPERTIES = [
'NaN', 'Infinity', 'undefined', 'eval', 'parseInt', 'parseFloat', 'isNaN',
'isFinite', 'decodeURI', 'decodeURIComponent', 'encodeURI',
'encodeURIComponent', 'Object', 'Function', 'Array', 'String', 'Boolean',
'Number', 'Date', 'RegExp', 'Error', 'EvalError', 'RangeError',
'ReferenceError', 'SyntaxError', 'TypeError', 'URIError', 'Math', 'JSON'
];
const GLOBAL_OBJECT_PROPERTY_MAP = {};
for (var n = 0; n < GLOBAL_OBJECT_PROPERTIES.length; n++) {
GLOBAL_OBJECT_PROPERTY_MAP[GLOBAL_OBJECT_PROPERTIES[n]] =
GLOBAL_OBJECT_PROPERTIES[n];
}
const kBufferedCommandSymbol = Symbol('bufferedCommand');
const kContextId = Symbol('contextId');

Expand Down Expand Up @@ -807,24 +795,17 @@ REPLServer.prototype.createContext = function() {
}, () => {
context = vm.createContext();
});
for (const name of Object.getOwnPropertyNames(global)) {
Object.defineProperty(context, name,
Object.getOwnPropertyDescriptor(global, name));
}
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Does this really skip console like it used to? Raw V8 contexts have a (primordial) console property.

It's quite possible the answer is "it doesn't matter either way" but I thought I'd ask anyway. :)

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It does not skip it. Instead, it just sets it twice. The overhead should be minimal and it's less code that way, so it seemed fine to me.

context.global = context;
const _console = new Console(this.outputStream);
Object.defineProperty(context, 'console', {
configurable: true,
writable: true,
value: _console
});

var names = Object.getOwnPropertyNames(global);
for (var n = 0; n < names.length; n++) {
var name = names[n];
if (name === 'console' || name === 'global')
continue;
if (GLOBAL_OBJECT_PROPERTY_MAP[name] === undefined) {
Object.defineProperty(context, name,
Object.getOwnPropertyDescriptor(global, name));
}
}
}

var module = new CJSModule('<repl>');
Expand Down Expand Up @@ -1137,19 +1118,19 @@ function complete(line, callback) {
}
completionGroups.push(
filteredOwnPropertyNames.call(this, this.context));
addStandardGlobals(completionGroups, filter);
if (filter !== '') addCommonWords(completionGroups);
completionGroupsLoaded();
} else {
this.eval('.scope', this.context, 'repl', function ev(err, globals) {
if (err || !Array.isArray(globals)) {
addStandardGlobals(completionGroups, filter);
if (filter !== '') addCommonWords(completionGroups);
} else if (Array.isArray(globals[0])) {
// Add grouped globals
for (var n = 0; n < globals.length; n++)
completionGroups.push(globals[n]);
} else {
completionGroups.push(globals);
addStandardGlobals(completionGroups, filter);
if (filter !== '') addCommonWords(completionGroups);
}
completionGroupsLoaded();
});
Expand Down Expand Up @@ -1373,21 +1354,16 @@ function _memory(cmd) {
}
}

function addStandardGlobals(completionGroups, filter) {
// Global object properties
// (http://www.ecma-international.org/publications/standards/Ecma-262.htm)
completionGroups.push(GLOBAL_OBJECT_PROPERTIES);
// Common keywords. Exclude for completion on the empty string, b/c
// they just get in the way.
if (filter) {
completionGroups.push([
'async', 'await', 'break', 'case', 'catch', 'const', 'continue',
'debugger', 'default', 'delete', 'do', 'else', 'export', 'false',
'finally', 'for', 'function', 'if', 'import', 'in', 'instanceof', 'let',
'new', 'null', 'return', 'switch', 'this', 'throw', 'true', 'try',
'typeof', 'undefined', 'var', 'void', 'while', 'with', 'yield'
]);
}
function addCommonWords(completionGroups) {
// Only words which do not yet exist as global property should be added to
// this list.
completionGroups.push([
'async', 'await', 'break', 'case', 'catch', 'const', 'continue',
'debugger', 'default', 'delete', 'do', 'else', 'export', 'false',
'finally', 'for', 'function', 'if', 'import', 'in', 'instanceof', 'let',
'new', 'null', 'return', 'switch', 'this', 'throw', 'true', 'try',
'typeof', 'var', 'void', 'while', 'with', 'yield'
]);
}

function _turnOnEditorMode(repl) {
Expand Down
2 changes: 1 addition & 1 deletion test/parallel/test-repl-tab-complete.js
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Original file line number Diff line number Diff line change
Expand Up @@ -457,7 +457,7 @@ const testNonGlobal = repl.start({
useGlobal: false
});

const builtins = [['Infinity', '', 'Int16Array', 'Int32Array',
const builtins = [['Infinity', 'Int16Array', 'Int32Array',
'Int8Array'], 'I'];

if (common.hasIntl) {
Expand Down