public override Node VisitCallExpression(DustParser.CallExpressionContext context)
{
string name = context.functionName().GetText();
CallParameter[] parameters = context.callParameterList().callParameter().Select(Visit).Cast <CallParameter>().ToArray();
Function function = visitorContext.GetFunction(name);
if (function == null)
{
visitorContext.ErrorHandler.ThrowError(new SyntaxError($"Function '{name}' is not defined", context.functionName().GetRange()));
return(null);
}
if (function.Parameters.Length != parameters.Length)
{
visitorContext.ErrorHandler.ThrowError(new SyntaxError($"Function '{function.Name}' has {function.Parameters.Length} parameters but is called with {parameters.Length}", context.callParameterList().GetRange()));
return(null);
}
return(new CallExpression(function, parameters, context.GetRange()));
}
/// <summary>
/// Visit a parse tree produced by the <c>CallExpression</c>
/// labeled alternative in <see cref="DustParser.expression"/>.
/// <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 VisitCallExpression([NotNull] DustParser.CallExpressionContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by the <c>CallExpression</c>
/// labeled alternative in <see cref="DustParser.expression"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitCallExpression([NotNull] DustParser.CallExpressionContext context)
{
}