Click here to Skip to main content
Click here to Skip to main content
Add your own
alternative version

Entity mapping language implementation using bsn-goldparser with CodeDom

, 6 Apr 2012
Use the GOLD Parser to define a language for mapping between two business entities, create a parser using the bsn-goldparser engine, and generate an assembly using CodeDom.
EntityMapper_src.zip
EntityMapper
bsn.GoldParser
bin
Debug
Grammar
obj
Debug
TempPE
Parser
Properties
Semantic
GoldRuleDeclaration.cgt
GoldRuleDeclaration.grm
Xml
EntityMapper
bin
Debug
EntityMapper.vshost.exe
EntityMapper.vshost.exe.manifest
CodeGen
EntityMapper.csproj.user
Model
MyTest.suo
obj
x86
Debug
Properties
Settings.settings
Semantic
EntityTransformation.cgt
EntityTransformation.grm
Service
// bsn GoldParser .NET Engine
// --------------------------
// 
// Copyright 2009, 2010 by Arsène von Wyss - avw@gmx.ch
// 
// Development has been supported by Sirius Technologies AG, Basel
// 
// Source:
// 
// https://bsn-goldparser.googlecode.com/hg/
// 
// License:
// 
// The library is distributed under the GNU Lesser General Public License:
// http://www.gnu.org/licenses/lgpl.html
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
// 
using System;
using System.Diagnostics;
using System.IO;

namespace bsn.GoldParser.Parser {
	internal class TextBuffer {
		private const int BufferSize = 2048;

		private readonly TextReader reader;
		private char[] buffer = new char[BufferSize];
		private int bufferLength;
		private int bufferOffset;
		private long bufferPosition;
		private int column = 1;
		private bool eof;
		private int line = 1;
		private char previous;

		public TextBuffer(TextReader reader) {
			if (reader == null) {
				throw new ArgumentNullException("reader");
			}
			this.reader = reader;
		}

		public int Column {
			get {
				return column;
			}
		}

		public int Line {
			get {
				return line;
			}
		}

		public long Position {
			get {
				return bufferPosition+bufferOffset;
			}
		}

		public TextReader TextReader {
			get {
				return reader;
			}
		}

		public string Read(int count, out LineInfo position) {
			position = new LineInfo(bufferPosition+bufferOffset, line, column);
			if (count == 0) {
				return string.Empty;
			}
			if (!EnsureBuffer(count-1)) {
				throw new ArgumentOutOfRangeException("count");
			}
			var result = new string(buffer, bufferOffset, count);
			for (int i = 0; i < count; i++) {
				char current = buffer[bufferOffset++];
				switch (current) {
				case '\r':
					HandleNewline(current, '\n');
					break;
				case '\n':
					HandleNewline(current, '\r');
					break;
				default:
					column++;
					previous = current;
					break;
				}
			}
			return result;
		}

		private void HandleNewline(char current, char skipChar) {
			if (previous != skipChar) {
				line++;
				column = 1;
				previous = current;
			} else {
				previous = default(char);
			}
		}

		public bool TryLookahead(ref int offset, out char ch) {
			if (TryLookahead(offset, out ch)) {
				offset ++;
				return true;
			}
			return false;
		}

		public bool TryLookahead(int offset, out char ch) {
			if (EnsureBuffer(offset)) {
				ch = buffer[bufferOffset+offset];
				return true;
			}
			ch = default(char);
			return false;
		}

		private bool EnsureBuffer(int offset) {
			Debug.Assert(offset >= 0);
			if (offset < 0) {
				return false;
			}
			if (bufferOffset+offset < bufferLength) {
				return true;
			}
			if (eof) {
				return false;
			}
			// get rid of unused buffered data to free buffer space
			if (bufferOffset > 0) {
				Array.Copy(buffer, bufferOffset, buffer, 0, bufferLength-bufferOffset);
				bufferPosition += bufferOffset;
				bufferLength -= bufferOffset;
				bufferOffset = 0;
			}
			// if the offset is above the buffer length, enhance the buffer size to match
			if (offset >= buffer.Length) {
				Array.Resize(ref buffer, Math.Max(buffer.Length*2, (offset-(offset%BufferSize)))+BufferSize);
			}
			// now try to fill the buffer with data
			int bufferEmptyCount = buffer.Length-bufferLength;
			Debug.Assert(bufferEmptyCount > 0);
			int length = reader.ReadBlock(buffer, bufferLength, bufferEmptyCount);
			if (length == 0) {
				eof = true;
			} else {
				bufferLength += length;
			}
			return offset < bufferLength;
		}
	}
}

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

matthew_from_hk
Founder
Hong Kong Hong Kong
I am always interested in finding innovative ways for building better applications and founded a technology company since 2003. Welcome to exchange any idea with you and if I am not too busy before deadline of projects, I will reply your emails. Also, if you willing to pay for consulting works and customized software development, you can leave me message.

| Advertise | Privacy | Mobile
Web04 | 2.8.140814.1 | Last Updated 7 Apr 2012
Article Copyright 2012 by matthew_from_hk
Everything else Copyright © CodeProject, 1999-2014
Terms of Service
Layout: fixed | fluid