Executing a Grammar from C#

Question

How can I call a grammar ( using m Engine ) developed in M from C#
Best Regards

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Luis Diego Rojas. http://icomparable.blogspot.com

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MCP, MCTS Biztalk Server

Answer 1

Basically you have to do the following

Compile your .mg file into an .mx by setting some of the following values into your project file:

 <PropertyGroup>
   <MBinaries32Path Condition="'$(MBinaries32Path)'==''">$(ProgramFiles)\Microsoft Oslo\1.0\bin</MBinaries32Path>
   <MBinaries64Path Condition="'$(MBinaries64Path)'==''">$(SystemDrive)\Program Files (x86)\Microsoft Oslo\1.0\bin</MBinaries64Path>
   <MTargetsPath Condition="'$(MTargetsPath)'==''">$(ProgramFiles)\MsBuild\Microsoft\M\v1.0</MTargetsPath>
   <MgTarget>Mgx</MgTarget>
 </PropertyGroup>
 <ItemGroup>
   <Reference Include="$(MBinaries32Path)\Microsoft.M.dll">
     <HintPath>"$(MBinaries64Path)\Microsoft.M.dll</HintPath>
     <Name>Microsoft.M</Name>
   </Reference>
   <Reference Include="$(MBinaries32Path)\Xaml.dll">
     <HintPath>$(MBinaries64Path)\Xaml.dll</HintPath>
     <Name>Xaml</Name>
   </Reference>
   <Reference Include="$(MBinaries32Path)\System.DataFlow.dll">
     <HintPath>$(MBinaries64Path)\System.DataFlow.dll</HintPath>
     <Name>System.DataFlow</Name>
   </Reference>
 </ItemGroup>
 <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.Targets" />
 <Import Project="$(MTargetsPath)\Microsoft.M.Embedded.targets" />

<ItemGroup>
    <MCompile Include="Lang.mg" />
</ItemGroup>

Then, at runtime, load the compiled .mx from the assembly resources using DynamicParser.LoadFromStream.

using (Stream stream = assembly.GetManifestResourceStream(assembly.GetName().Name + ".mx"))
{
   return DynamicParser.LoadFromStream(stream, language);

Then you can call the dynamic parser like so:

DynamicParser langParser = dynamicParserService.Load();
System.Dataflow.ISourceInfo rootNode = (System.Dataflow.ISourceInfo)langParser.Parse(new TextReaderTextStream(streamService.Uri.LocalPath, code), errorReporter);

Where 'code' is the Stream of the file containing your DSL text.

Additionally you can check out the MetaSharp source code for a more complete reference on how to not only read the DSL but how to interpret it into CLR objects:

http://metasharp.codeplex.com/SourceControl/changeset/view/32489#

Also, you might be able to just use it to do whatever it is you're trying to accomplish.