Subject: bug#59906: 29.0.60; typescript-ts-mode is not highlighting escape sequences

From: Jostein Kjønigsen <[email-masked]>
Date: Thu, 8 Dec 2022 18:23:52 +0100

On 08.12.2022 16:19, Theodor Thornhill wrote:
> Jostein Kjønigsen <[email-masked]> writes:
>
>> In a buffer with typescript-ts-mode activated, write the following code:
>>
>> const test = "quoted\"string\" contents";
>>
>> The entire text, include the \" is highlighted as strings, and escape sequences are not handled:
>>
>> This code has the following tree-sitter syntax tree:
>>
>>   (lexical_declaration kind: const
>>    (variable_declarator name: (identifier) value: =
>>     (string " (string_fragment) (escape_sequence) (string_fragment) (escape_sequence) (string_fragment) "))
>>    ;)
>>
>> In typescript-ts-mode we seemingly have rules to handle fontification of escape sequences:
>>
>>      :language language
>>      :feature 'escape-sequence
>>      :override t
>>      '((escape_sequence) @font-lock-escape-face))
>>
>> This feature is however not activated in the major-mode setup:
>>
>>       (setq-local treesit-font-lock-feature-list
>>                   '((comment declaration)
>>                     (keyword string)
>>                     (constant expression identifier number pattern property)
>>                     (bracket delimiter)))
>>
>> Naively I assumed that simply adding this feature would activate this rule, but still \" is fontified as string.
> Yeah, there was an error there.  See below patch.
>
> Yuan, can you install this?
>
> Theo
>
Yeah that works for me.

Yuan: another vote for installing right here :)

--
Jostein