public override object VisitFunctionDefinition([NotNull] functionalParser.FunctionDefinitionContext context)
{
var predicate = ((string, string[], Ty))Visit(context.predicate());
FunctionType functionPredicate;
if (predicate.Item3.Type.Is <FunctionType>())
{
functionPredicate = predicate.Item3.Type.As <FunctionType>();
}
else
{
// If the predicate is not a function type make it into one (e.g. main :: Int)
functionPredicate = new FunctionType(new Ty[] { predicate.Item3 });
}
var overloads = context.stmt().Select(
(obj) => ((string, Pattern[], Node, WhereClauseNode))Visit(obj)).ToArray();
// check if all functions are of the same name
if (overloads.Any((obj) => obj.Item1 != predicate.Item1))
{
ErrorReporter.Error("The function block `{0}` contains different functions", predicate.Item1);
}
return(new FunctionNode(
predicate.Item1,
overloads.Select((obj) => (obj.Item2, obj.Item3, obj.Item4)).ToArray(),
functionPredicate,
predicate.Item2,
FileAndLine(context)
));
}
/// <summary>
/// Visit a parse tree produced by the <c>FunctionDefinition</c>
/// labeled alternative in <see cref="functionalParser.definition"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitFunctionDefinition([NotNull] functionalParser.FunctionDefinitionContext context)
{
return(VisitChildren(context));
}