整理代码1

interpreter/UniLua/LuaFile.cs

@@ -0,0 +1,134 @@
+ using System;
+using System.IO;
+using System.Collections.Generic;
+
+namespace UniLua
+{
+	public delegate string PathHook(string filename);
+	public class LuaFile
+	{
+		public static Dictionary<string, byte[]> VirtualFiles;
+
+        public static ILoadInfo OpenFile( string filename )
+		{
+            foreach (var file in VirtualFiles.Keys)
+            {
+                if (file == filename)
+                {
+                    return new BytesLoadInfo(VirtualFiles[filename]); ;
+                }
+            }
+
+            return new FileLoadInfo( File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite ) );
+		}
+
+		public static bool Readable( string filename )
+		{
+            foreach (var file in VirtualFiles.Keys)
+            {
+                if (file == filename)
+                {
+                    return true;
+                }
+            }
+
+            try {
+				using( var stream = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite ) ) {
+					return true;
+				}
+			}
+			catch( Exception ) {
+				return false;
+			}
+		}
+	}
+
+	public class FileLoadInfo : ILoadInfo, IDisposable
+	{
+		public FileLoadInfo( FileStream stream )
+		{
+			Stream = stream;
+      Reader = new StreamReader(Stream, System.Text.Encoding.ASCII);
+			Buf = new Queue<char>();
+		}
+
+		public int ReadByte()
+		{
+			if( Buf.Count > 0 )
+				return (int)Buf.Dequeue();
+			else
+				return Reader.Read();
+		}
+
+		public int PeekByte()
+		{
+			if( Buf.Count > 0 )
+				return (int)Buf.Peek();
+			else
+			{
+				var c = Reader.Read();
+				if( c == -1 )
+					return c;
+				Save( (char)c );
+				return c;
+			}
+		}
+
+		public void Dispose()
+		{
+      Reader.Dispose();
+			Stream.Dispose();
+		}
+
+		private const string UTF8_BOM = "\u00EF\u00BB\u00BF";
+		private FileStream 	Stream;
+		private StreamReader 	Reader;
+		private Queue<char>	Buf;
+
+		private void Save( char b )
+		{
+			Buf.Enqueue( b );
+		}
+
+		private void Clear()
+		{
+			Buf.Clear();
+		}
+
+#if false
+		private int SkipBOM()
+		{
+			for( var i=0; i<UTF8_BOM.Length; ++i )
+			{
+				var c = Stream.ReadByte();
+				if(c == -1 || c != (byte)UTF8_BOM[i])
+					return c;
+				Save( (char)c );
+			}
+			// perfix matched; discard it
+			Clear();
+			return Stream.ReadByte();
+		}
+#endif
+
+		public void SkipComment()
+		{
+			var c = Reader.Read();//SkipBOM();
+
+			// first line is a comment (Unix exec. file)?
+			if( c == '#' )
+			{
+				do {
+					c = Reader.Read();
+				} while( c != -1 && c != '\n' );
+				Save( (char)'\n' ); // fix line number
+			}
+			else if( c != -1 )
+			{
+				Save( (char)c );
+			}
+		}
+	}
+
+}
+