Re: [GSOC][PATCH] userdiff: Add JavaScript function patterns

[Patrick Steinhardt <ps@pks.im>]

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On Fri, Mar 01, 2024 at 08:40:48AM +0100, Sergius Nyah wrote:
> This commit adds a patterns used to match JavaScript functions.
> It now correctly identifies function declarations, function expressions,
> and functions defined inside blocks. Add test for corresponding change in userdiff.
> 
> Signed-off-by: Sergius Nyah <sergiusnyah@gmail.com>
> ---
>  t/t4018-diff-funcname.sh | 22 ++++++++++++++++++++++
>  userdiff.c               | 12 ++++++++++++
>  2 files changed, 34 insertions(+)
> 
> diff --git a/t/t4018-diff-funcname.sh b/t/t4018-diff-funcname.sh
> index e026fac1f4..d35cce18a0 100755
> --- a/t/t4018-diff-funcname.sh
> +++ b/t/t4018-diff-funcname.sh
> @@ -120,3 +120,25 @@ do
>  done
> 
>  test_done
> +
> +test_expect_success 'identify builtin patterns in JavaScript' '
> +	# setup
> +	echo "function myFunction() { return true; }" > test.js &&
> +	echo "var myVar = function() { return false; }" >> test.js &&
> +	git add test.js &&
> +	git commit -m "add test.js" &&
> +
> +	# modify the file
> +	echo "function myFunction() { return false; }" > test.js &&
> +	echo "var myVar = function() { return true; }" >> test.js &&
> +
> +	# command under test
> +	git diff >output &&
> +
> +	# check results
> +	test_i18ngrep "function myFunction() { return true; }" output &&
> +	test_i18ngrep "function myFunction() { return false; }" output &&
> +	test_i18ngrep "var myVar = function() { return false; }" output &&
> +	test_i18ngrep "var myVar = function() { return true; }" output
> +'
> +test_done
> \ No newline at end of file

This `test_done` only needs to be added because you add the new test
before the preceding `test_done`. Instead, you should move up this test
so that it comes before it.

> diff --git a/userdiff.c b/userdiff.c
> index 2b1dab2649..bbe2bcb9a3 100644
> --- a/userdiff.c
> +++ b/userdiff.c
> +PATTERNS("javascript",
> +      /* Looks for lines that start with optional whitespace, followed

Multi-line comments should start with their delimiters on separate
lines. So the "/*" should be on its own line.

Also, the code should be indented with tabs and not spaces. It might
help to read through Documentation/CodingGuidelines to get more familiar
with Git's coding style.

Patrick

> +      * by 'function'* and any characters (for function declarations),
> +      * or valid JavaScript identifiers, equals sign '=', 'function' keyword
> +      * and any characters (for function expressions).
> +      * Also considers functions defined inside blocks with '{...}'.
> +      */
> +      "^[ \t]*(function[ \t]*.*|[a-zA-Z_$][0-9a-zA-Z_$]*[ \t]*=[ \t]*function[ \t]*.*|(\\{[ \t]*)?)\n",
> +      /* This pattern matches JavaScript identifiers */
> +      "[a-zA-Z_$][0-9a-zA-Z_$]*"
> +      "|[-+0-9.eE]+|0[xX][0-9a-fA-F]+"
> +      "|[-+*/<>%&^|=!:]=|--|\\+\\+|<<=?|>>=?|&&|\\|\\|"),
> --
> 2.43.2
> 

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