all node type are defined

2026-02-02 18:11:46 +08:00
parent 73b222bbc6
commit fe0e4ad7a4
9 changed files with 405 additions and 130 deletions
@@ -0,0 +1,196 @@
+//-----------------------------------------------------------------------
+// -----------------------------------------------------------------------
+// file="Node.Char"
+// 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 StgSharp.State;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StgSharp.RegularAnalysis
+{
+    internal enum EpsilonKind
+    {
+
+        Always,
+        Begin,
+        End,
+        LineBegin,
+        LineEnd,
+        WordBoundary,
+        NonWordBoundary
+
+    }
+
+    internal class RegularExpressionEpsilonNode : RegularStateNode
+    {
+
+        public RegularExpressionEpsilonNode(
+               EpsilonKind kind = EpsilonKind.Always
+        )
+        {
+            Kind = kind;
+        }
+
+        public EpsilonKind Kind { get; }
+
+        public override NodeType Type => NodeType.EPSILON;
+
+        public override bool IsValidateFrom(
+                             RegularStateNode former,
+                             RegularContext context
+        )
+        {
+            int pos = context.Position;
+            int len = context.Source?.Length ?? 0;
+
+            bool PrevIsWord()
+            {
+                if (pos - 1 < 0 || pos - 1 >= len) {
+                    return false;
+                }
+
+                char c = context.Source[pos - 1];
+                return char.IsLetterOrDigit(c) || c == '_';
+            }
+
+            bool NextIsWord()
+            {
+                if (pos < 0 || pos >= len) {
+                    return false;
+                }
+
+                char c = context.Source[pos];
+                return char.IsLetterOrDigit(c) || c == '_';
+            }
+
+            switch (Kind)
+            {
+                case EpsilonKind.Always:
+                    return true;
+                case EpsilonKind.Begin:
+                    return pos == context.Begin;
+                case EpsilonKind.End:
+                    return pos == len;
+                case EpsilonKind.LineBegin:
+                    if (pos == 0) {
+                        return true;
+                    }
+
+                    if (pos - 1 < 0 || pos - 1 >= len) {
+                        return false;
+                    }
+
+                    return context.Source[pos - 1] == '\n' || context.Source[pos - 1] == '\r';
+                case EpsilonKind.LineEnd:
+                    if (pos == len) {
+                        return true;
+                    }
+
+                    if (pos < 0 || pos >= len) {
+                        return false;
+                    }
+
+                    return context.Source[pos] == '\n' || context.Source[pos] == '\r';
+                case EpsilonKind.WordBoundary:
+                    return PrevIsWord() != NextIsWord();
+                case EpsilonKind.NonWordBoundary:
+                    return PrevIsWord() == NextIsWord();
+                default:
+                    return false;
+            }
+        }
+
+    }
+
+    internal class RegularExpressionCharNode : RegularStateNode
+    {
+
+        private char _char;
+
+        public RegularExpressionCharNode(
+               char c
+        )
+        {
+            _char = c;
+        }
+
+        public override NodeType Type => NodeType.CHAR;
+
+        public override bool IsValidateFrom(
+                             RegularStateNode former,
+                             RegularContext context
+        )
+        {
+            int pos = context.Position;
+            char c = context.CurrentCharSpan[pos + 1];
+            return  c == _char;
+        }
+
+    }
+
+    internal class RegularExpressionCharsetNode : RegularStateNode
+    {
+
+        private bool _isNegated;
+        private HashSet<char> _charset;
+
+        public RegularExpressionCharsetNode(
+               IEnumerable<char> charset,
+               bool isNegated = false
+        )
+        {
+            _charset = new(charset);
+            _isNegated = isNegated;
+        }
+
+        public RegularExpressionCharsetNode(
+               ReadOnlySpan<char> charset,
+               bool isNegated = false
+        )
+        {
+            _charset = new(charset.Length);
+            _isNegated = isNegated;
+        }
+
+        public override NodeType Type => NodeType.CHARSET;
+
+        public override bool IsValidateFrom(
+                             RegularStateNode former,
+                             RegularContext context
+        )
+        {
+            int pos = context.Position;
+            char c = context.CurrentCharSpan[pos + 1];
+            bool contains = _charset.Contains(c);
+            return _isNegated ? !contains : contains;
+        }
+
+    }
+}