begin regex ir opt

2026-06-23 20:08:33 +08:00
parent 7e5e4d1f7a
commit 2b05d626c7
10 changed files with 210 additions and 194 deletions
@@ -0,0 +1,126 @@
+//-----------------------------------------------------------------------
+// -----------------------------------------------------------------------
+// file="RegexInterpreter.IROptimize"
+// Project: StgSharp
+// AuthorGroup: Nitload
+// Copyright (c) Nitload. All rights reserved.
+//     
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//     
+// -----------------------------------------------------------------------
+// -----------------------------------------------------------------------
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StgSharp.RegularAnalysis.Text
+{
+    public partial class RegexAnalyzer
+    {
+
+        internal static RegexInfo ScanAndOptimizeIR(
+                                  List<RegexIR> baseIR,
+                                  out List<RegexIR> optIR
+        )
+        {
+            int index = 0;
+            List<RegexIR> optimizedIR = new(baseIR.Count);
+            List<RegexIR> segment = [];
+            RegexInfo info = new();
+            do
+            {
+                // TODO scan and opt here
+                OptimizeIR(baseIR, ref index, segment, info);
+                optimizedIR.AddRange(segment);
+                index++;
+            } while (index < baseIR.Count);
+            optIR = optimizedIR;
+            return info;
+        }
+
+        private static void OptimizeDot(
+                            RegexCountSetIR root,
+                            List<RegexIR> ir,
+                            ref int index,
+                            List<RegexIR> optimizedIR,
+                            RegexInfo info
+        )
+        {
+            int next = index + 1;
+            if (next >= ir.Count)
+            {
+                optimizedIR.Clear();
+                optimizedIR.Add(root);
+                return;
+            }
+            RegexIR nextIR = ir[next];
+            if (nextIR.Command == RegexIRCommand.Match_Seq)
+            {
+                // opt .*abc style
+                RegexFindSeqIR find = new((nextIR as RegexMatchSeqIR)!.Pattern);
+                optimizedIR.Add(find);
+                info.MinLength += find.Pattern.Length;
+                return;
+            } else { }
+        }
+
+        private static void OptimizeIR(
+                            List<RegexIR> ir,
+                            ref int index,
+                            List<RegexIR> optimizedIR,
+                            RegexInfo info
+        )
+        {
+            optimizedIR.Clear();
+
+            // TODO optimize here
+            RegexIR root = ir[index];
+            switch (root.Command)
+            {
+                case RegexIRCommand.Count_Set:
+                    RegexCountSetIR count = (root as RegexCountSetIR)!;
+                    if (count.CharSet == ".")
+                    {
+                        // opt for .+ / .* / .{}    pattern
+                        OptimizeDot(count, ir, ref index, optimizedIR, info);
+                    }
+                    break;
+                case RegexIRCommand.Match_Seq:
+                    info.MinLength += (root as RegexMatchSeqIR)!.Pattern.Length;
+                    optimizedIR.Add(root);
+                    break;
+                default:
+                    optimizedIR.Add(root);
+                    break;
+            }
+        }
+
+        internal class RegexInfo
+        {
+
+            public int MinLength { get; set; }
+
+            public int TryDepth { get; set; }
+
+        }
+
+    }
+}