SystemExtensions/SystemExtensions.NetStandard.Generators/Diagnostics.cs

using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;

namespace System.Extensions;

internal static class Diagnostics
{
    public const string DependencyPropertyGenerator_NoAttributeFound = "DGD 0001";
    public const string DependencyPropertyGenerator_ClassMustBeTopLevel = "DGD 1001";
    public const string DependencyPropertyGenerator_ClassMustBePartial = "DGD 1002";
    public const string DependencyPropertyGenerator_ClassMustBeInNamespace = "DGD 1003";
    public const string DependencyPropertyGenerator_ClassMustImplementINotifyPropertyChanged = "DGD 1004";

    public static Diagnostic MissingAttributeDiagnostic(string attributeName, string attributeNamespace) => Diagnostic.Create(
                new DiagnosticDescriptor(
                    DependencyPropertyGenerator_NoAttributeFound,
                    $"{attributeNamespace}.{attributeName} not found",
                    "Could not find attribute with name {0} in namespace {1}.",
                    "SystemExtensions.NetStandard.Generators",
                    DiagnosticSeverity.Error,
                    true,
                    $"This error occurs when the attribute generated by the {nameof(NotifyPropertyChangedGenerator)} is not found",
                    null),
                Location.None,
                attributeName, attributeNamespace);

    public static Diagnostic ClassNotTopLevelDiagnostic(string className, string containingSymbol, SyntaxTree syntaxTree, TextSpan textSpan) => Diagnostic.Create(
                new DiagnosticDescriptor(
                    DependencyPropertyGenerator_ClassMustBeTopLevel,
                    $"{className} must be top level",
                    "Class {0} must be top level. It is currently declared under {1}.",
                    "SystemExtensions.NetStandard.Generators",
                    DiagnosticSeverity.Error,
                    true,
                    null,
                    null),
                Location.Create(syntaxTree, textSpan),
                className, containingSymbol);

    public static Diagnostic ClassNotPartial(string className) => Diagnostic.Create(
                new DiagnosticDescriptor(
                    DependencyPropertyGenerator_ClassMustBePartial,
                    $"{className} is not partial",
                    "Class {0} must be marked as partial in order for the generator to work",
                    "SystemExtensions.NetStandard.Generators",
                    DiagnosticSeverity.Error,
                    true,
                    null,
                    null),
                Location.None,
                className);

    public static Diagnostic ClassNotInNamespace(string className) => Diagnostic.Create(
                new DiagnosticDescriptor(
                    DependencyPropertyGenerator_ClassMustBeInNamespace,
                    $"{className} is not defined in a namespace",
                    "Class {0} must be defined inside a namespace for the generator to work",
                    "SystemExtensions.NetStandard.Generators",
                    DiagnosticSeverity.Error,
                    true,
                    null,
                    null),
                Location.None,
                className);

    public static Diagnostic ClassDoesNotImplementINotifyPropertyChanged(string className) => Diagnostic.Create(
                new DiagnosticDescriptor(
                    DependencyPropertyGenerator_ClassMustImplementINotifyPropertyChanged,
                    $"{className} must implement INotifyPropertyChanged",
                    "Class {0} must implement INotifyPropertyChanged for the generator to work",
                    "SystemExtensions.NetStandard.Generators",
                    DiagnosticSeverity.Error,
                    true,
                    null,
                    null),
                Location.None,
                className);
}