private void BindFunctionDeclaration(FunctionDeclarationSyntax syntax)
{
string funcName = syntax.Identifier == null ? syntax.ImplicitLabel : syntax.Identifier.ToString();
var parameters = ImmutableArray.CreateBuilder <ParameterSymbol>();
var returnType = TypeDescriptionBinder.BindTypeDescription(syntax.ReturnType.TypeDescription);
foreach (var parameter in syntax.Parameters)
{
string parameterName = parameter.IdentifierName.ToString();
var typeBind = TypeDescriptionBinder.BindTypeDescription(parameter.Definition.TypeDescription);
int line = parameter.Definition.TypeDescription.Location.Line;
int column = parameter.Definition.TypeDescription.Location.Column;
var span = parameter.Definition.TypeDescription.Span;
if (typeBind == null)
{
diagnostics.AddDiagnostic(Diagnostic.ReportInvalidParameterDefinition(line, column, span));
return;
}
if (typeBind.Equals(ValueTypeSymbol.Void))
{
diagnostics.AddDiagnostic(Diagnostic.ReportVoidType(parameter.Definition.TypeDescription.Location, span));
return;
}
parameters.Add(new ParameterSymbol(parameterName, typeBind));
}
if (returnType == null)
{
diagnostics.AddDiagnostic(Diagnostic.ReportInvalidReturnType(syntax.ReturnType.Location, syntax.ReturnType.Span));
return;
}
var functionSymbol = new FunctionSymbol(funcName, parameters.ToImmutable(), returnType, syntax);
if (!scope.TryDefineFunction(functionSymbol))
{
diagnostics.AddDiagnostic(Diagnostic.ReportCannotRedefineFunction(syntax.Identifier.Location, syntax.Identifier.Span));
}
else
{
functions.Add(functionSymbol);
}
}
