/// <summary>
/// Constructs an AST that represents a root namespace with a single class, Test, containing a single
/// method, Main, which contains a single statement that writes "hello" to the console.
/// </summary>
private RootNamespaceDeclaration ConstructRootNamespace()
{
//Normally this routine will use a parser to parse the contents of this.SourceLocation.
//However, this sample just illustrates how an AST can be constructed and then compiled to a PE file,
//so parsing is not necessary.
var nameTable = this.Helper.Compilation.NameTable;
//Note that this is top down constrution, exploiting the mutability of the member lists.
//Some parsers may need to do bottom up construction, which is also supported.
var namespaceMembers = new List <INamespaceDeclarationMember>(1);
var result = new RootNamespaceDeclaration(this, null, namespaceMembers, this.sourceLocation);
var typeName = nameTable.GetNameFor("Test");
var typeNameDeclaration = new NameDeclaration(typeName, this.sourceLocation);
var baseTypes = new List <TypeExpression>(0);
var typeMembers = new List <ITypeDeclarationMember>(1);
var classDeclaration = new NamespaceClassDeclaration(null, TypeDeclaration.Flags.None, typeNameDeclaration, null,
baseTypes, typeMembers, this.sourceLocation);
namespaceMembers.Add(classDeclaration);
var voidExpr = TypeExpression.For(this.Helper.Compilation.PlatformType.SystemVoid);
var methodName = nameTable.GetNameFor("Main");
var methodNameDeclaration = new NameDeclaration(methodName, this.sourceLocation);
var statements = new List <Statement>(1);
var body = new BlockStatement(statements, this.sourceLocation);
var methodDeclaration = new MethodDeclaration(null, MethodDeclaration.Flags.Static, TypeMemberVisibility.Public, voidExpr, null,
methodNameDeclaration, null, null, null, body, this.sourceLocation);
typeMembers.Add(methodDeclaration);
var system = new SimpleName(nameTable.GetNameFor("System"), this.sourceLocation, false);
var console = new SimpleName(nameTable.GetNameFor("Console"), this.sourceLocation, false);
var systemConsole = new QualifiedName(system, console, this.sourceLocation);
var writeLine = new SimpleName(nameTable.GetNameFor("WriteLine"), this.sourceLocation, false);
var methodToCall = new QualifiedName(systemConsole, writeLine, this.sourceLocation);
var arguments = new List <Expression>(1);
arguments.Add(new CompileTimeConstant("hello", this.sourceLocation));
var methodCall = new MethodCall(methodToCall, arguments, this.sourceLocation);
var callStatement = new ExpressionStatement(methodCall, this.sourceLocation.SourceDocument.GetSourceLocation(0, 5));
statements.Add(callStatement);
//The statements above do only the first phase initialization of the AST. The second phase
//occurs as the AST is traversed from the top down.
return(result);
}