public override LambdaExpression CompileExpression(ExpressionToCompile expressionToCompile)
{
var options = ScriptOptions.Default
.AddReferences(MetadataReferences)
.AddImports(expressionToCompile.ImportedNamespaces);
var untypedExpressionScript = Create(expressionToCompile.Code, options);
var compilation = untypedExpressionScript.GetCompilation();
var syntaxTree = compilation.SyntaxTrees.First();
var identifiers = GetIdentifiers(syntaxTree);
var resolvedIdentifiers =
identifiers
.Select(name => (Name: name, Type: expressionToCompile.VariableTypeGetter(name)))
.Where(var => var.Type != null)
.ToArray();
const string Comma = ", ";
var names = string.Join(Comma, resolvedIdentifiers.Select(var => var.Name));
var types = string.Join(Comma,
resolvedIdentifiers
.Select(var => var.Type)
.Concat(new[] { expressionToCompile.LambdaReturnType })
.Select(GetTypeName));
var finalCompilation = compilation.ReplaceSyntaxTree(syntaxTree, syntaxTree.WithChangedText(SourceText.From(
CreateExpressionCode(types, names, expressionToCompile.Code))));
var results = ScriptingAotCompiler.BuildAssembly(finalCompilation);
if (results.HasErrors)
{
throw FxTrace.Exception.AsError(new SourceExpressionException(SR.CompilerErrorSpecificExpression(expressionToCompile.Code, results), results.CompilerMessages));
}
return((LambdaExpression)results.ResultType.GetMethod("CreateExpression").Invoke(null, null));
}
public abstract LambdaExpression CompileExpression(ExpressionToCompile compilerRequest);
