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LibJS: Allow Unicode escape sequences in identifiers

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For example, "property.br\u{64}wn" should resolve to "property.brown".

To support this behavior, this commit changes the Token class to hold
both the evaluated identifier name and a view into the original source
for the unevaluated name. There are some contexts in which identifiers
are not allowed to contain Unicode escape sequences; for example, export
statements of the form "export {} from foo.js" forbid escapes in the
identifier "from".

The test file is added to .prettierignore because prettier will replace
all escaped Unicode sequences with their unescaped value.
This commit is contained in:
Timothy Flynn
2021-08-18 16:34:25 -04:00
committed by Andreas Kling
parent c5b5c779ff
commit 1259dc3623
Notes: sideshowbarker 2024-07-18 05:28:09 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/1259dc36237
Pull-request: https://github.com/SerenityOS/serenity/pull/9499
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/davidot ✅
7 changed files with 163 additions and 54 deletions
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.prettierignore
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@@ -1,3 +1,3 @@
Base/home/anon/Source/js
Userland/Libraries/LibJS/Tests/eval-aliasing.js
Userland/Libraries/LibJS/Tests/unicode-identifier-escape.js