Handle multi-line statements in the console

If a student types the following into the console and presses Enter:

if (name === "Pop") {

The console should recognize that it is an incomplete statement, and allow the student to keep typing (with an expanded input area to accommodate the new line).

This seems hard—how do we distinguish between an incomplete multiline statement and a statement that is syntactically invalid for some other reason? Perhaps Esprima or one of our other linters/parsers throws a specific “unexpected end of input” type error that we can rely on.

まず、コンソール入力の処理と、その parser または linter が例の文に対して入力の予期しない終了をどのように報告するかを追跡します。不完全な入力を他の構文エラーと区別する方法と、継続行に合わせて入力領域がどのように拡張されるかを確認します。例を複数行にわたって続けられる一方で、本当に無効な文については引き続きエラーが報告されれば完了です。