Exemplo n.º 1
0
        // Typecheck an invocation of Table.
        public override bool CheckInvocation(TexlBinding binding, TexlNode[] args, DType[] argTypes, IErrorContainer errors, out DType returnType, out Dictionary <TexlNode, DType> nodeToCoercedTypeMap)
        {
            Contracts.AssertValue(args);
            Contracts.AssertAllValues(args);
            Contracts.AssertValue(argTypes);
            Contracts.Assert(args.Length == argTypes.Length);
            Contracts.AssertValue(errors);
            Contracts.Assert(MinArity <= args.Length && args.Length <= MaxArity);

            bool isValid = base.CheckInvocation(args, argTypes, errors, out returnType, out nodeToCoercedTypeMap);

            Contracts.Assert(returnType.IsTable);

            // Ensure that all args (if any) are records with compatible schemas.
            DType rowType = DType.EmptyRecord;

            for (int i = 0; i < argTypes.Length; i++)
            {
                DType argType = argTypes[i];
                if (!argType.IsRecord)
                {
                    errors.EnsureError(DocumentErrorSeverity.Severe, args[i], TexlStrings.ErrNeedRecord);
                    isValid = false;
                }
                else if (!rowType.CanUnionWith(argType))
                {
                    errors.EnsureError(DocumentErrorSeverity.Severe, args[i], TexlStrings.ErrIncompatibleRecord);
                    isValid = false;
                }
                else
                {
                    bool isUnionError = false;
                    rowType = DType.Union(ref isUnionError, rowType, argType);
                    Contracts.Assert(!isUnionError);
                    Contracts.Assert(rowType.IsRecord);
                }
            }

            Contracts.Assert(rowType.IsRecord);
            returnType = rowType.ToTable();

            return(isValid);
        }