private BoundExpression BindCallExpression(CallExpressionSyntax syntax)
{
var arguments = ImmutableArray.CreateBuilder <BoundExpression>();
foreach (var argument in syntax.Arguments)
{
var boundArgument = BindExpression(argument);
arguments.Add(boundArgument);
}
var functions = BuiltinFunctions.GetAll();
var function = functions.SingleOrDefault(f => f.Name == syntax.IdentifierToken.Text);
if (function == null)
{
_diagnostics.ReportUndefinedFunction(syntax.IdentifierToken.Span, syntax.IdentifierToken.Text);
return(new BoundErrorExpression());
}
if (syntax.Arguments.Count != function.Parameters.Length)
{
_diagnostics.ReportIncorrectArgumentCount(syntax.Span, function.Name, function.Parameters.Length, syntax.Arguments.Count);
return(new BoundErrorExpression());
}
for (var i = 0; i < function.Parameters.Length; i++)
{
var parameter = function.Parameters[i];
var argument = arguments[i];
if (parameter.Type != argument.Type)
{
_diagnostics.ReportTypeMismatch(syntax.Span, argument.Type, function.Parameters[i].Type);
return(new BoundErrorExpression());
}
}
return(new BoundCallExpression(function, arguments.ToImmutable()));
}
