Creating DAL Components Using Custom ASP.NET Build Providers And Compiler Techniques

//
// Parago Media GmbH & Co. KG, J�rgen B�urle (jbaurle@parago.de)
// 
// 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.IO;
using System.Web.Compilation;
using Parago.DALComp.Compiler;

namespace Parago.DALComp {

	/// <summary>
	/// Build provider to generate DAL code from source file with extension '.dal'. 
	/// The file gets compiled only within the application folder 'App_Code'.
	/// </summary>
	[BuildProviderAppliesTo(BuildProviderAppliesTo.Code)]
	public class DALCompBuildProvider : BuildProvider {

		public override void GenerateCode(AssemblyBuilder builder) {

			// Read the source code file to compile (*.dal)
			string source=String.Empty;
			using(TextReader reader=OpenReader()) {
				source=reader.ReadToEnd();
				reader.Close();
			}
			
			// Tokenize, parse and generate DAL code and turn generated 
			// compile unit over to ASP.NET build process
			Tokenizer tokenizer=new Tokenizer(source);
			Parser parser=new Parser(tokenizer);
			CodeGen codeGen=new CodeGen(parser);
			builder.AddCodeCompileUnit(this, codeGen.Generate());

		}

	}

}