Working on tree optimizer

2026-02-11 18:02:45 +08:00
parent 4735b987f4
commit 39dd32992d
9 changed files with 193 additions and 63 deletions
@@ -33,6 +33,7 @@ using System.Linq;
 using System.Runtime.CompilerServices;
 using System.Text;
 using System.Threading.Tasks;
+using System.Xml.Linq;

 namespace StgSharp.RegularAnalysis.TextRegex
 {
@@ -52,10 +53,8 @@ namespace StgSharp.RegularAnalysis.TextRegex

        public long NodeFlag => (long)Source.Flag;

-        public static RegexAstNode Empty
-        {
-            get => new EmptyRegexAstNode();
-        }
+        public static RegexAstNode Empty { get; }
+        = new EmptyRegexAstNode();

        public RegexAstNode Previous { get; set; }

@@ -68,7 +67,7 @@ namespace StgSharp.RegularAnalysis.TextRegex
            get;
            set
            {
-                field?.Parent = null;
+                field?.Parent = Empty;
                field = value;
                value.Parent = this;
            }
@@ -79,7 +78,7 @@ namespace StgSharp.RegularAnalysis.TextRegex
            get;
            set
            {
-                field?.Parent = null;
+                field?.Parent = Empty;
                field = value;
                value.Parent = this;
            }
@@ -90,13 +89,19 @@ namespace StgSharp.RegularAnalysis.TextRegex
            get => Source.Flag;
        }

+        public string Value => Source.Value;
+
        public string CodeConvertTemplate { get; }

        public Token<RegexElementLabel> Source { get; }

        public void AppendNode(
                    RegexAstNode nextToken
-        ) { }
+        )
+        {
+            Next = nextToken;
+            nextToken.Previous = this;
+        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static (bool Valid,int Value) ComparePrecedence(
@@ -113,9 +118,33 @@ namespace StgSharp.RegularAnalysis.TextRegex
            return (true,v_left - v_right);
        }

+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static bool IsNullOrEmpty(
+                           RegexAstNode node
+        )
+        {
+            return node is null || node.Equals(Empty);
+        }
+
        public void PrependNode(
                    RegexAstNode previousNode
-        ) { }
+        )
+        {
+            Previous = previousNode;
+            previousNode.Next = this;
+        }
+
+        public void RemoveChild(
+                    RegexAstNode node
+        )
+        {
+            if (Left == node)
+            {
+                Left = Empty;
+            } else if (Right == node) {
+                Right = Empty;
+            }
+        }

        public static bool TryMergeUnit(
                           RegexAstNode prev,