From d77f7a5fe06113cd472e907643f1172a148d052a Mon Sep 17 00:00:00 2001
From: Sho Sakuma <me@m1sk9.dev>
Date: Sat, 7 Feb 2026 18:49:07 +0900
Subject: fix: Fix kana converter valid romaji

---
 .../m1sk9/lunaticChat/paper/converter/RomanjiConverter.kt   | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

(limited to 'platform-paper/src/main')

diff --git a/platform-paper/src/main/kotlin/dev/m1sk9/lunaticChat/paper/converter/RomanjiConverter.kt b/platform-paper/src/main/kotlin/dev/m1sk9/lunaticChat/paper/converter/RomanjiConverter.kt
index 9e54f24..c961af8 100644
--- a/platform-paper/src/main/kotlin/dev/m1sk9/lunaticChat/paper/converter/RomanjiConverter.kt
+++ b/platform-paper/src/main/kotlin/dev/m1sk9/lunaticChat/paper/converter/RomanjiConverter.kt
@@ -48,11 +48,18 @@ class RomanjiConverter(
                 continue
             }
 
+            // Pre-validate: Check if the word is valid romaji before attempting conversion
+            // This prevents partial conversion of English words (e.g., "This" -> "てぃs")
+            if (!KanaConverter.isValidRomaji(word)) {
+                if (debugMode) {
+                    logger.info("Word is not valid romaji, keeping original: $word")
+                }
+                results.add(word)
+                continue
+            }
+
             // Step 1: Romanji -> Hiragana
             val hiragana = KanaConverter.toHiragana(word)
-            if (debugMode) {
-                logger.info("Romanji -> Hiragana: $word -> $hiragana")
-            }
 
             // Step 2: Hiragana -> Kanji/Kana
             val converted =
-- 
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