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StgSharp.Model/Step/Reader/StepDataReader.cs

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+//-----------------------------------------------------------------------
+//-----------------------------------------------------------------------
+//     file="StepDataReader.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.Concurrent;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.IO;
+using System.IO.MemoryMappedFiles;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace StgSharp.Modeling.STEP
+{
+    public partial class StepReader
+    {
+
+        private Regex expressionSpilitter = GetExpressionSplitter();
+
+        private ThreadLocal<ConcurrentQueue<StepCodeLine>> _codeLineQueue 
+            = new ThreadLocal<ConcurrentQueue<StepCodeLine>>();
+
+        public ConcurrentQueue<StepCodeLine> DataSectionPool
+        {
+            get => _codeLineQueue.Value;
+        }
+
+        public void ReadDataSection()
+        {
+            if( _codeLineQueue.Value == null ) {
+                _codeLineQueue.Value = new ConcurrentQueue<StepCodeLine>();
+            }
+            using( MemoryMappedViewStream ms = _memoryFile.CreateViewStream(
+                0, _size, MemoryMappedFileAccess.Read ) )
+            {
+                using( StreamReader sr = new StreamReader( ms ) )
+                {
+                    long pos = _headStart;
+                    string line;
+                    while( string.IsNullOrEmpty( line = sr.ReadLine()! ) )
+                    {
+                        Match match = expressionSpilitter.Match( line );
+                        if( match.Success )
+                        {
+                            int id = int.Parse( match.Groups[ "id" ].Value );
+                            string expression = match.Groups[ "expression" ].Value;
+                            StepCodeLine stepExpression = new StepCodeLine( id, expression );
+                            _codeLineQueue.Value.Enqueue( stepExpression );
+                        }
+                    }
+                }
+            }
+        }
+
+        [GeneratedRegex(
+                @"^#(?<id>[0-9]+)\s*?=\s*?(?<expression>\S.*?)\s*;$",
+                RegexOptions.Compiled | RegexOptions.Singleline )]
+        private static partial Regex GetExpressionSplitter();
+
+    }
+}