LibJS: Parse line continuations in string literals properly

Newlines after line continuation were inserted into the string literals. This patch makes the parser ignore the newlines after \ and also makes it so that "use strict" containing a line continuation is not a valid "use strict".
Author: https://github.com/nooga Commit: e5ddcadd3c Pull-request: https://github.com/SerenityOS/serenity/pull/3845 Issue: https://github.com/SerenityOS/serenity/issues/3816 Reviewed-by: https://github.com/linusg ✅
2025-08-12 19:19:30 +00:00 · 2020-10-25 14:46:51 +01:00 · 2020-10-25 14:46:51 +01:00 · e5ddcadd3c · 2024-07-19 01:44:24 +09:00
commit e5ddcadd3c
parent e6505a95f1
4 changed files with 18 additions and 0 deletions
--- a/Libraries/LibJS/Tests/template-literals.js
+++ b/Libraries/LibJS/Tests/template-literals.js
@ -53,6 +53,13 @@ test("newline literals (not characters)", () => {
    ).toBe("foo\n    bar");
 });

+test("line continuation in literals (not characters)", () => {
+    expect(
+        `foo\
+    bar`
+    ).toBe("foo    bar");
+});
+
 test("reference error from expressions", () => {
    expect(() => `${b}`).toThrowWithMessage(ReferenceError, "'b' is not defined");
 });