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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();
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 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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