feat: 按照open_set中的示例调整语法 (#71)

添加了构建LR分析表冲突的报错

Reviewed-on: PostGuard/Canon#71

Canon.Core/Exceptions/ReduceAndShiftConflictException.cs

@@ -0,0 +1,6 @@
+namespace Canon.Core.Exceptions;
+
+public class ReduceAndShiftConflictException : Exception
+{
+
+}

Canon.Core/Exceptions/ReduceConflictException.cs

@@ -0,0 +1,17 @@
+using Canon.Core.GrammarParser;
+
+namespace Canon.Core.Exceptions;
+
+public class ReduceConflictException(LrState originState, Terminator lookAhead, NonTerminator left1, NonTerminator left2)
+    : Exception
+{
+    public LrState OriginState { get; } = originState;
+
+    public Terminator LookAhead { get; } = lookAhead;
+
+    public NonTerminator Left1 { get; } = left1;
+
+    public NonTerminator Left2 { get; } = left2;
+
+    public override string Message => "Reduce Conflict!";
+}