fix(parser,decompiler): 修正

- テーブルセル内のline-breakに不要な_preservedTrailingBreakフラグを設定しない
- デコンパイラで末尾line-breakの改行を保持し、正しいroundtripを実現

Author: r74tech

packages/decompiler/src/serializer/table.ts

@@ -34,9 +34,18 @@ export function serializeTable(ctx: SerializeContext, data: TableData): void {
       const innerCtx = new SerializeContext({ newline: ctx.newline });
       innerCtx.forceLineBreakSyntax = true;
       serializeElements(innerCtx, cell.elements);
-      const content = innerCtx.getOutput().replace(/\n$/, "");
+      const raw = innerCtx.getOutput();
+      const content = raw.replace(/\n$/, "");
 
-      ctx.push(`${prefix} ${content} `);
+      // When content ends with ` _` (from a trailing line-break that was
+      // serialised as ` _\n`), preserve the newline so the closing `||`
+      // appears on the next line — otherwise the parser sees literal `_`.
+      const nl = ctx.newline;
+      if (raw.endsWith(` _${nl}`)) {
+        ctx.push(`${prefix} ${content}${nl}`);
+      } else {
+        ctx.push(`${prefix} ${content} `);
+      }
     }
     ctx.pushLine("||");
   }

packages/parser/src/parser/rules/block/table.ts

@@ -332,9 +332,7 @@ function parseTableCell(
         afterTok &&
         (afterTok.type === "NEWLINE" || afterTok.type === "EOF")
       ) {
-        const lb: Element & { _preservedTrailingBreak?: boolean } = { element: "line-break" };
-        lb._preservedTrailingBreak = true;
-        children.push(lb);
+        children.push({ element: "line-break" });
         pos += 3;
         consumed += 3;
         continue;

tests/fixtures/table/line-break/expected.json

@@ -669,8 +669,7 @@
                     "data": "が"
                   },
                   {
-                    "element": "line-break",
-                    "_preservedTrailingBreak": true
+                    "element": "line-break"
                   },
                   {
                     "element": "text",