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using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Diagnostics;
namespace StardewModdingAPI.ModBuildConfig.Analyzer
{
/// <summary>Detects references to a field which has been replaced.</summary>
[DiagnosticAnalyzer(LanguageNames.CSharp)]
public class ObsoleteFieldAnalyzer : DiagnosticAnalyzer
{
/*********
** Properties
*********/
/// <summary>Maps obsolete fields/properties to their non-obsolete equivalent.</summary>
private readonly IDictionary<string, string> ReplacedFields = new Dictionary<string, string>
{
// Farmer
["StardewValley.Farmer::friendships"] = "friendshipData"
};
/// <summary>Describes the diagnostic rule covered by the analyzer.</summary>
private readonly IDictionary<string, DiagnosticDescriptor> Rules = new Dictionary<string, DiagnosticDescriptor>
{
["SMAPI003"] = new DiagnosticDescriptor(
id: "SMAPI003",
title: "Reference to obsolete field",
messageFormat: "The '{0}' field is obsolete and should be replaced with '{1}'. See https://smapi.io/buildmsg/smapi003 for details.",
category: "SMAPI.CommonErrors",
defaultSeverity: DiagnosticSeverity.Warning,
isEnabledByDefault: true,
helpLinkUri: "https://smapi.io/buildmsg/smapi003"
)
};
/*********
** Accessors
*********/
/// <summary>The descriptors for the diagnostics that this analyzer is capable of producing.</summary>
public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get; }
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
public ObsoleteFieldAnalyzer()
{
this.SupportedDiagnostics = ImmutableArray.CreateRange(this.Rules.Values);
}
/// <summary>Called once at session start to register actions in the analysis context.</summary>
/// <param name="context">The analysis context.</param>
public override void Initialize(AnalysisContext context)
{
// SMAPI003: avoid obsolete fields
context.RegisterSyntaxNodeAction(
this.AnalyzeObsoleteFields,
SyntaxKind.SimpleMemberAccessExpression
);
}
/*********
** Private methods
*********/
/// <summary>Analyse a syntax node and add a diagnostic message if it references an obsolete field.</summary>
/// <param name="context">The analysis context.</param>
private void AnalyzeObsoleteFields(SyntaxNodeAnalysisContext context)
{
try
{
// get reference info
MemberAccessExpressionSyntax node = (MemberAccessExpressionSyntax)context.Node;
ITypeSymbol declaringType = context.SemanticModel.GetTypeInfo(node.Expression).Type;
string propertyName = node.Name.Identifier.Text;
// suggest replacement
for (ITypeSymbol type = declaringType; type != null; type = type.BaseType)
{
if (this.ReplacedFields.TryGetValue($"{type}::{propertyName}", out string replacement))
{
context.ReportDiagnostic(Diagnostic.Create(this.Rules["SMAPI003"], context.Node.GetLocation(), $"{type}.{propertyName}", replacement));
break;
}
}
}
catch (Exception ex)
{
throw new InvalidOperationException($"Failed processing expression: '{context.Node}'. Exception details: {ex.ToString().Replace('\r', ' ').Replace('\n', ' ')}");
}
}
}
}
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