From 9cf316fe29eec9d4800627af61c506cbd0b40981 Mon Sep 17 00:00:00 2001
From: javara999 <javara999@gmail.com>
Date: Wed, 1 Apr 2026 11:35:46 +0900
Subject: [PATCH] Add remaining linkkf core files

---
 linkkf/subtitle_util.py | 44 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 linkkf/subtitle_util.py

diff --git a/linkkf/subtitle_util.py b/linkkf/subtitle_util.py
new file mode 100644
index 0000000..1a80997
--- /dev/null
+++ b/linkkf/subtitle_util.py
@@ -0,0 +1,44 @@
+import re
+
+from support import SupportFile
+
+
+def write_file(data, filepath):
+    SupportFile.write_file(filepath, data)
+
+
+def convert_vtt_to_srt(vtt_data):
+    lines = []
+    counter = 1
+
+    for block in re.split(r"\r?\n\r?\n", vtt_data.strip()):
+        block = block.strip()
+        if block == "" or block == "WEBVTT":
+            continue
+
+        block_lines = [line.strip("\ufeff") for line in block.splitlines() if line.strip() != ""]
+        if not block_lines:
+            continue
+
+        if block_lines[0].startswith("WEBVTT"):
+            block_lines = block_lines[1:]
+        if not block_lines:
+            continue
+
+        if "-->" not in block_lines[0] and len(block_lines) > 1 and "-->" in block_lines[1]:
+            block_lines = block_lines[1:]
+
+        if "-->" not in block_lines[0]:
+            continue
+
+        timing = block_lines[0].replace(".", ",")
+        payload = block_lines[1:]
+
+        lines.append(str(counter))
+        lines.append(timing)
+        lines.extend(payload)
+        lines.append("")
+        counter += 1
+
+    return "\n".join(lines).strip() + "\n"
+