[PATCH 3/4] utils: checkstyle.py: Add a check for hex values

[Kieran Bingham]

Quoting Laurent Pinchart (2024-05-31 13:18:37)
> libcamera uses lowercase hex values. Add a corresponding checker.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>

Reviewed-by: Kieran Bingham <kieran.bingham at ideasonboard.com>

> ---
>  utils/checkstyle.py | 28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/utils/checkstyle.py b/utils/checkstyle.py
> index f3604299de94..77d6f39011c1 100755
> --- a/utils/checkstyle.py
> +++ b/utils/checkstyle.py
> @@ -562,6 +562,34 @@ class StyleIssue(object):
>          self.msg = msg
>  
>  
> +class HexValueChecker(StyleChecker):
> +    patterns = ('*.c', '*.cpp', '*.h')
> +
> +    regex = re.compile(r'\b0[xX][0-9a-fA-F]+\b')
> +
> +    def __init__(self, content):
> +        super().__init__()
> +        self.__content = content
> +
> +    def check(self, line_numbers):
> +        issues = []
> +
> +        for line_number in line_numbers:
> +            line = self.__content[line_number - 1]
> +            match = HexValueChecker.regex.search(line)
> +            if not match:
> +                continue
> +
> +            value = match.group(0)
> +            if value == value.lower():
> +                continue
> +
> +            issues.append(StyleIssue(line_number, line,
> +                                     f'Use lowercase hex constant {value.lower()}'))
> +
> +        return issues
> +
> +
>  class IncludeChecker(StyleChecker):
>      patterns = ('*.cpp', '*.h')
>  
> -- 
> Regards,
> 
> Laurent Pinchart
>