周辺のテキストとして行全体を返すように修正した

src/reader.hpp

@@ -73,7 +73,7 @@ struct Reader {
         if (row > 0){
             ret += lines[row-1] + "\n";
         }
-        ret += lines[row].substr(0,col);
+        ret += lines[row];
         return ret;
     }
 };

src/syntax/EnumerateBlock.hpp

@@ -120,7 +120,7 @@ struct EnumerateBlockSyntax : public BlockSyntax {
                 // depth has decreased and the difference is multiple of 3
                 if (depth < current && (current - depth) % 3 == 0) return true;
                 // ambiguous enum definition detected
-                std::cerr << "Warning near '" << read.near() << "'" << std::endl;
+                std::cerr << "Warning: ambiguous enum\n ... \n" << read.near() << "\n^^^ parsing line" << std::endl;
                 std::cerr << "indent width must be 3. this line is considered as raw text." << std::endl;
                 return false;
             }()){

src/syntax/ListBlock.hpp

@@ -111,7 +111,7 @@ struct ListBlockSyntax : public BlockSyntax {
                 // depth has decreased and the difference is even
                 if (depth < current && (current - depth) % 2 == 0) return true;
                 // ambiguous list definition detected
-                std::cerr << "Warning near '" << read.near() << "'" << std::endl;
+                std::cerr << "Warning: ambiguous list\n ... \n" << read.near() << "\n^^^ parsing line" << std::endl;
                 std::cerr << "indent width must be 2. this line is considered as raw text." << std::endl;
                 return false;
             }()){