internal Expression <T> BuildExpression <T>(string expressionName, string expression)
{
var owner = DefaultExpressionOwner.Instance;
var ownerType = DefaultExpressionOwner.Type;
Imports.ImportOwner(ownerType);
var context = new ExpressionContext(Options, expressionName, owner)
{
Variables = Variables,
Imports = Imports,
ComputeInstance = ComputeInstance,
};
var topElement = Parse(expression, context);
var rootElement = new RootExpressionElement(topElement, typeof(T));
var dynamicMethod = CreateDynamicMethod <T>(ownerType);
var ilGenerator = new YaleIlGenerator(dynamicMethod.GetILGenerator());
rootElement.Emit(ilGenerator, context);
#if DEBUG
ilGenerator.ValidateLength();
#endif
var delegateType = typeof(ExpressionEvaluator <>).MakeGenericType(typeof(T));
var evaluator = (ExpressionEvaluator <T>)dynamicMethod.CreateDelegate(delegateType);
return(new Expression <T>(expression, evaluator, context));
}
private void Compile(string expression, ExpressionOptions options)
{
// Add the services that will be used by elements during the compile
IServiceContainer services = new ServiceContainer();
this.AddServices(services);
// Parse and get the root element of the parse tree
ExpressionElement topElement = _myContext.Parse(expression, services);
if (options.ResultType == null)
{
options.ResultType = topElement.ResultType;
}
RootExpressionElement rootElement = new RootExpressionElement(topElement, options.ResultType);
DynamicMethod dm = this.CreateDynamicMethod();
FleeILGenerator ilg = new FleeILGenerator(dm.GetILGenerator());
// Emit the IL
rootElement.Emit(ilg, services);
if (ilg.NeedsSecondPass())
{
// second pass required due to long branches.
dm = this.CreateDynamicMethod();
ilg.PrepareSecondPass(dm.GetILGenerator());
rootElement.Emit(ilg, services);
}
ilg.ValidateLength();
// Emit to an assembly if required
if (options.EmitToAssembly == true)
{
EmitToAssembly(ilg, rootElement, services);
}
Type delegateType = typeof(ExpressionEvaluator <>).MakeGenericType(typeof(T));
_myEvaluator = (ExpressionEvaluator <T>)dm.CreateDelegate(delegateType);
}
