LuaTableTextWriter should support writing fields outside table.

This will prevent LField.ToString() from throwing writer exception.

Author: CXuesong

Luaon.NET/LuaTableTextWriter.cs

@@ -50,7 +50,7 @@ private enum Token
             // @formatter:off
             /*                          TableStart        TableEnd        KeyStart         KeyEnd       Literal*/
             /* Unknown      */ new[] {State.Error,      State.Error,    State.Error,    State.Error,    State.Error},
-            /* Start        */ new[] {State.TableStart, State.Error,    State.Error,    State.Error,    State.Start},
+            /* Start        */ new[] {State.TableStart, State.Error,    State.KeyStart, State.Error,    State.FieldStart},
             /* TableStart   */ new[] {State.TableStart, State.Unknown,  State.KeyStart, State.Error,    State.FieldStart},
             /* FieldStart   */ new[] {State.TableStart, State.Unknown,  State.KeyStart, State.Error,    State.FieldStart},
             /* KeyStart     */ new[] {State.TableStart, State.Error,    State.Error,    State.Error,    State.Key},
@@ -231,7 +231,6 @@ public virtual void WriteEndTable()
         /// </summary>
         public virtual void WriteStartKey()
         {
-            AssertContainerType(LuaContainerType.Table);
             DelimitLastValue(Token.KeyStart);
             Writer.Write('[');
             Push(LuaContainerType.Key);
@@ -263,7 +262,6 @@ public virtual void WriteKey(string key)
             if (key == null) throw new ArgumentNullException(nameof(key));
             if (key.Length <= MaxUnquotedNameLength && LuaConvert.IsValidIdentifier(key))
             {
-                AssertContainerType(LuaContainerType.Table);
                 DelimitLastValue(Token.KeyStart);
                 GotoNextState(Token.Literal);
                 Writer.Write(key);

XUnitTestProject1/Tests/LuaTableTextWriterTests.cs

@@ -102,5 +102,29 @@ public void WriteNestedTableTest()
             }
         }
 
+        [Fact]
+        public void WriteOutsideTableTest()
+        {
+            using (var sw = new StringWriter())
+            using (var tw = new LuaTableTextWriter(sw))
+            {
+                tw.WriteLiteral(123);
+
+                tw.WriteStartKey();
+                tw.WriteLiteral(2);
+                tw.WriteEndKey();
+
+                tw.WriteLiteral(456);
+
+                tw.WriteKey("key");
+                tw.WriteLiteral("value");
+
+                tw.WriteLiteral("last");
+
+                tw.Flush();
+                Assert.Equal("123,[2]=456,key=\"value\",\"last\"", sw.ToString());
+            }
+        }
+
     }
 }