private static void Emit(SourceFileBuilder source, IReadOnlyList <Statement> statements)
{
foreach (var statement in statements)
{
Emit(source, statement);
}
}
public string Emit()
{
var source = new SourceFileBuilder();
source.WriteIndentedLine("#pragma once");
source.WriteLine();
source.WriteIndentedLine("// Dependencies");
source.WriteIndentedLine("#include <cstdint>");
source.WriteIndentedLine($"#include \"{CppRuntime.FileName}\"");
foreach (var dependency in package.Dependencies)
{
source.WriteIndentedLine($"#include \"{dependency.Package.Name}.cpp\"");
}
source.WriteLine();
source.WriteIndentedLine("namespace");
source.BeginBlock();
Emit(source, package.GlobalNamespace.GetMembers());
source.EndBlock();
EmitEntryPoint(source);
return(source.ToString());
}
private static void Emit(SourceFileBuilder source, IEnumerable <Declaration> declarations)
{
foreach (var declaration in declarations)
{
declaration.Match()
.With <Namespace>(ns =>
{
source.WriteIndentedLine($"namespace {ns.Name}");
source.BeginBlock();
Emit(source, ns.GetMembers());
source.EndBlock();
})
.With <Function>(function =>
{
// TODO write correct return type
// TODO write correct parameter types
source.WriteIndentedLine($"{TypeOf(function.ReturnType)} {function.Name}()");
source.BeginBlock();
Emit(source, function.Body);
// TODO write body
source.EndBlock();
})
.Exhaustive();
}
}
private void EmitEntryPoint(SourceFileBuilder source)
{
var entryPoint = package.EntryPoints.SingleOrDefault();
if (entryPoint == null)
{
return;
}
source.WriteLine();
source.WriteIndentedLine("int main(int argc, char *argv[])");
source.BeginBlock();
var entryPointName = CodeFor(entryPoint.QualifiedName());
if (entryPoint.ReturnType.Type is VoidType)
{
source.WriteIndentedLine($"{entryPointName}();");
source.WriteIndentedLine("return 0;");
}
else
{
source.WriteIndentedLine($"auto exitCodePtr = {entryPointName}();");
source.WriteIndentedLine("auto exitCode = *exitCodePtr;");
source.WriteIndentedLine("delete exitCodePtr;");
source.WriteIndentedLine("return exitCode;");
}
source.EndBlock();
}
private static void Emit(SourceFileBuilder source, Statement statement)
{
statement.Match()
.With <Return>(@return =>
{
var code = @return.Expression != null ? $"return {CodeFor(@return.Expression)};" : "return;";
source.WriteIndentedLine(code);
})
.Exhaustive();
}
