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'use strict';
require('../common');
const assert = require('assert');
const repl = require('repl');
const stream = require('stream');
testSloppyMode();
testStrictMode();
testResetContext();
testResetContextGlobal();
testMagicMode();
testError();
function testSloppyMode() {
const r = initRepl(repl.REPL_MODE_SLOPPY);
// Cannot use `let` in sloppy mode
r.write(`_; // initial value undefined
var x = 10; // evaluates to undefined
_; // still undefined
y = 10; // evaluates to 10
_; // 10 from last eval
_ = 20; // explicitly set to 20
_; // 20 from user input
_ = 30; // make sure we can set it twice and no prompt
_; // 30 from user input
y = 40; // make sure eval doesn't change _
_; // remains 30 from user input
`);
assertOutput(r.output, [
'undefined',
'undefined',
'undefined',
'10',
'10',
'Expression assignment to _ now disabled.',
'20',
'20',
'30',
'30',
'40',
'30'
]);
}
function testStrictMode() {
const r = initRepl(repl.REPL_MODE_STRICT);
r.write(`_; // initial value undefined
var x = 10; // evaluates to undefined
_; // still undefined
let _ = 20; // use 'let' only in strict mode - evals to undefined
_; // 20 from user input
_ = 30; // make sure we can set it twice and no prompt
_; // 30 from user input
var y = 40; // make sure eval doesn't change _
_; // remains 30 from user input
function f() { let _ = 50; } // undefined
f(); // undefined
_; // remains 30 from user input
`);
assertOutput(r.output, [
'undefined',
'undefined',
'undefined',
'undefined',
'20',
'30',
'30',
'undefined',
'30',
'undefined',
'undefined',
'30'
]);
}
function testMagicMode() {
const r = initRepl(repl.REPL_MODE_MAGIC);
r.write(`_; // initial value undefined
x = 10; //
_; // last eval - 10
let _ = 20; // undefined
_; // 20 from user input
_ = 30; // make sure we can set it twice and no prompt
_; // 30 from user input
var y = 40; // make sure eval doesn't change _
_; // remains 30 from user input
function f() { let _ = 50; return _; } // undefined
f(); // 50
_; // remains 30 from user input
`);
assertOutput(r.output, [
'undefined',
'10',
'10',
'undefined',
'20',
'30',
'30',
'undefined',
'30',
'undefined',
'50',
'30'
]);
}
function testResetContext() {
const r = initRepl(repl.REPL_MODE_SLOPPY);
r.write(`_ = 10; // explicitly set to 10
_; // 10 from user input
.clear // Clearing context...
_; // remains 10
x = 20; // but behavior reverts to last eval
_; // expect 20
`);
assertOutput(r.output, [
'Expression assignment to _ now disabled.',
'10',
'10',
'Clearing context...',
'10',
'20',
'20'
]);
}
function testResetContextGlobal() {
const r = initRepl(repl.REPL_MODE_STRICT, true);
r.write(`_ = 10; // explicitly set to 10
_; // 10 from user input
.clear // No output because useGlobal is true
_; // remains 10
`);
assertOutput(r.output, [
'Expression assignment to _ now disabled.',
'10',
'10',
'10',
]);
// Delete globals leaked by REPL when `useGlobal` is `true`
delete global.module;
delete global.require;
}
function testError() {
const r = initRepl(repl.REPL_MODE_STRICT);
r.write(`_error; // initial value undefined
throw new Error('foo'); // throws error
_error; // shows error
fs.readdirSync('/nonexistent?'); // throws error, sync
_error.code; // shows error code
_error.syscall; // shows error syscall
setImmediate(() => { throw new Error('baz'); }); undefined;
// throws error, async
`);
setImmediate(() => {
const lines = r.output.accum.trim().split('\n');
const expectedLines = [
'undefined',
// The error, both from the original throw and the `_error` echo.
'Uncaught Error: foo',
'[Error: foo]',
// The sync error, with individual property echoes
/^Uncaught Error: ENOENT: no such file or directory, scandir '.*nonexistent\?'/,
/Object\.readdirSync/,
/^ errno: -(2|4058),$/,
" syscall: 'scandir',",
" code: 'ENOENT',",
" path: '/nonexistent?'",
'}',
"'ENOENT'",
"'scandir'",
// Dummy 'undefined' from the explicit silencer + one from the comment
'undefined',
'undefined',
// The message from the original throw
'Uncaught Error: baz',
];
for (const line of lines) {
const expected = expectedLines.shift();
if (typeof expected === 'string')
assert.strictEqual(line, expected);
else
assert(expected.test(line), `${line} should match ${expected}`);
}
assert.strictEqual(expectedLines.length, 0);
// Reset output, check that '_error' is the asynchronously caught error.
r.output.accum = '';
r.write(`_error.message // show the message
_error = 0; // disable auto-assignment
throw new Error('quux'); // new error
_error; // should not see the new error
`);
assertOutput(r.output, [
"'baz'",
'Expression assignment to _error now disabled.',
'0',
'Uncaught Error: quux',
'0'
]);
});
}
function initRepl(mode, useGlobal) {
const inputStream = new stream.PassThrough();
const outputStream = new stream.PassThrough();
outputStream.accum = '';
outputStream.on('data', (data) => {
outputStream.accum += data;
});
return repl.start({
input: inputStream,
output: outputStream,
useColors: false,
terminal: false,
prompt: '',
replMode: mode,
useGlobal: useGlobal
});
}
function assertOutput(output, expected) {
const lines = output.accum.trim().split('\n');
assert.deepStrictEqual(lines, expected);
}
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