[PATCH v4 09/23] libtuning: Improve filename parsing

[Stefan Klug]

In the tuning datasets, the files had names like
'imx335_1600l_3000k_1.dng'. That failed on the old filename parsing
function. As there is no need to dictate the order of the tags, split
the big regex into chunks and parse them one by one. This also makes
the code easier to digest.

Signed-off-by: Stefan Klug <stefan.klug at ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder at ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
 utils/tuning/libtuning/utils.py | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/utils/tuning/libtuning/utils.py b/utils/tuning/libtuning/utils.py
index 90fd7072a0fd..c70dfae049bc 100644
--- a/utils/tuning/libtuning/utils.py
+++ b/utils/tuning/libtuning/utils.py
@@ -43,16 +43,30 @@ def _list_image_files(directory):
 
 
 def _parse_image_filename(fn: Path):
-    result = re.search(r'^(alsc_)?(\d+)[kK]_(\d+)?[lLuU]?.\w{3,4}$', fn.name)
-    if result is None:
-        logger.error(f'The file name of {fn.name} is incorrectly formatted')
-        return None, None, None
+    lsc_only = False
+    color_temperature = None
+    lux = None
+
+    parts = fn.stem.split('_')
+    for part in parts:
+        if part == 'alsc':
+            lsc_only = True
+            continue
+        r = re.match(r'(\d+)[kK]', part)
+        if r:
+            color_temperature = int(r.group(1))
+            continue
+        r = re.match(r'(\d+)[lLuU]', part)
+        if r:
+            lux = int(r.group(1))
+
+    if color_temperature is None:
+        logger.error(f'The file name of "{fn.name}" does not contain a color temperature')
 
-    color = int(result.group(2))
-    lsc_only = result.group(1) is not None
-    lux = None if lsc_only else int(result.group(3))
+    if lux is None and lsc_only is False:
+        logger.error(f'The file name of "{fn.name}" must either contain alsc or a lux level')
 
-    return color, lux, lsc_only
+    return color_temperature, lux, lsc_only
 
 
 # \todo Implement this from check_imgs() in ctt.py
-- 
2.43.0