daily update on 20240203 by nitload youmu, ExpComment Comment Splitter ok, case code(* comment[comment*)code--comment and comment*)code--comment not added, may use span optimize all programme

内核源代码/StgSharp.Script/Express/ExpSourceReader.cs

@@ -0,0 +1,143 @@
+//-----------------------------------------------------------------------
+//-----------------------------------------------------------------------
+//     file="ExpSourceReader.cs"
+//     Project: StgSharp
+//     AuthorGroup: Nitload Space
+//     Copyright (c) Nitload Space. 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.Runtime.CompilerServices;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace StgSharp.Script.Express
+{
+    public class ExpSourceReader
+    {
+
+        private static Regex 
+            _commentSplitter = new Regex(
+            @"(?<code>\S*)\s*--.*", RegexOptions.Compiled ),
+            _multiLineCommentBegin = new Regex(
+            @"(?<code>\S*)\s*\(\*.*", RegexOptions.Compiled ),
+            _multiLineCommentEnd = new Regex(
+            @".*\*\)\s*(?<code>\S*)", RegexOptions.Compiled );
+        private bool _isReadingMultiLineComment;
+        private IScriptSourceProvider _provider;
+
+        public ExpSourceReader( IScriptSourceProvider provider )
+        {
+            _provider = provider;
+        }
+
+        public string ReadLine()
+        {
+            return _provider.ReadLine();
+        }
+
+        public string ReadNoCommentLine()
+        {
+            string line = string.Empty;
+            while( TryReadNoCommentLine( ref line ) ) { }
+            return line;
+        }
+
+        //Returns true when no usable string returns
+        private bool TryReadNoCommentLine( ref string line )
+        {
+            int index;
+            string str = _provider.ReadLine();
+            if( string.IsNullOrEmpty( str ) ) {
+                return true;
+            }
+            if( _isReadingMultiLineComment ) {
+                index = str.LastIndexOf( @"*)" ) + 2; //calc by beginning of code
+                if( index == 1 || index >= str.Length ) {
+                    return true;
+                }
+                line = str.SliceAndTrim( index );
+                _isReadingMultiLineComment = false;
+                return string.IsNullOrEmpty(line);
+            }
+            index = str.IndexOf( @"--" );
+            if( index != -1 ) {
+                line = str.SliceAndTrim( 0, index );
+                return string.IsNullOrEmpty(str);
+            }
+            index = str.IndexOf(@"(*");
+            if (index > 0) {
+                if (TrySliceMultiLineCommentInSingleLine(ref str, index))
+                {
+                    line = str;
+                    return string.IsNullOrEmpty(str);
+                }
+                line = str.SliceAndTrim(0,index);
+                _isReadingMultiLineComment = true;
+                return string.IsNullOrEmpty(str);
+            }
+            line = str;
+            return string.IsNullOrEmpty(str);
+        }
+
+        //returns true when a usable string returns
+        private unsafe bool TrySliceMultiLineCommentInSingleLine(ref string source, int commentBegin)
+        {
+            string origin = source;
+            int index = origin.IndexOf("*)",commentBegin);
+            if (index == -1)
+            {
+                return false;
+            }
+            index += 2;
+            int begin = commentBegin - 1;
+            ReadOnlySpan<char> sourceSpan = origin.AsSpan();
+            while (begin >= 0 && char.IsWhiteSpace(sourceSpan[begin])) 
+            {
+                begin--;
+            }
+            while (index < origin.Length && char.IsWhiteSpace(sourceSpan[index]))
+            {
+                index++;
+            }
+            if (begin == 0 && index == origin.Length - 1)
+            {
+                source = string.Empty;
+                return true;
+            }
+            fixed (char* cPtr = sourceSpan)
+            {
+                int secLength = origin.Length - index;
+                Span<char> o = new Span<char>(cPtr, origin.Length);
+                Span<char> s = o.Slice(0, begin + 1 + secLength);
+                Span<char> sec = o.Slice(index), dest = o.Slice(begin+1, secLength);
+                sec.CopyTo(dest);
+                source = new string(s);
+            }
+            return true;
+        }
+    }
+}