static void BuildGetHashCode(ITypeSymbol symbol, AttributesMetadata attributesMetadata, StringBuilder sb)
{
var baseTypeName = symbol.BaseType?.ToFQF();
sb.AppendLine("#nullable enable");
sb.AppendLine(@"public override int GetHashCode() {
var hashCode = new global::System.HashCode();
");
sb.AppendLine(baseTypeName == "object"
? "hashCode.Add(this.EqualityContract);"
: "hashCode.Add(base.GetHashCode());");
foreach (var property in symbol.GetProperties())
{
var propertyName = property.ToFQF();
if (propertyName == "EqualityContract")
{
continue;
}
BuildPropertyHashCode(property, attributesMetadata, sb);
}
sb.AppendLine("return hashCode.ToHashCode();");
sb.AppendLine("}");
sb.AppendLine("#nullable restore");
}
static void BuildEquals(ITypeSymbol symbol, AttributesMetadata attributesMetadata, StringBuilder sb)
{
var symbolName = symbol.ToFQF();
var baseTypeName = symbol.BaseType?.ToFQF();
sb.AppendLine("#nullable enable");
sb.AppendLine(symbol.IsSealed
? $"public bool Equals({symbolName}? other) {{"
: $"public virtual bool Equals({symbolName}? other) {{");
sb.AppendLine(baseTypeName == "object"
? "return !ReferenceEquals(other, null) && EqualityContract == other.EqualityContract"
: $"return base.Equals(({baseTypeName}?)other)");
foreach (var property in symbol.GetProperties())
{
var propertyName = property.ToFQF();
if (propertyName == "EqualityContract")
{
continue;
}
BuildPropertyEquality(attributesMetadata, sb, property);
}
sb.AppendLine(";");
sb.AppendLine("}");
sb.AppendLine("#nullable restore");
}
static void BuildEquals(ITypeSymbol symbol, AttributesMetadata attributesMetadata, StringBuilder sb, bool explicitMode)
{
var symbolName = symbol.ToFQF();
var baseTypeName = symbol.BaseType?.ToFQF();
sb.AppendLine(InheritDocComment);
sb.AppendLine(GeneratedCodeAttributeDeclaration);
sb.AppendLine(symbol.IsSealed
? $"public bool Equals({symbolName}? other) {{"
: $"public virtual bool Equals({symbolName}? other) {{");
sb.AppendLine(baseTypeName == "object"
? "return !ReferenceEquals(other, null) && EqualityContract == other.EqualityContract"
: $"return base.Equals(({baseTypeName}?)other)");
foreach (var property in symbol.GetProperties())
{
var propertyName = property.ToFQF();
if (propertyName == "EqualityContract")
{
continue;
}
BuildPropertyEquality(attributesMetadata, sb, property, explicitMode);
}
sb.AppendLine(";");
sb.AppendLine("}");
}
static void BuildEquals(ITypeSymbol symbol, AttributesMetadata attributesMetadata, StringBuilder sb)
{
var symbolName = symbol.ToFQF();
var baseTypeName = symbol.BaseType?.ToFQF();
sb.AppendLine("#nullable enable");
sb.AppendLine($"public static bool operator ==({symbolName}? a, {symbolName}? b) => global::System.Collections.Generic.EqualityComparer<{symbolName}>.Default.Equals(a, b);");
sb.AppendLine($"public static bool operator !=({symbolName}? a, {symbolName}? b) => !(a == b);");
sb.AppendLine($"public override bool Equals(object? obj) => Equals(obj as {symbolName});");
sb.AppendLine($"public bool Equals({symbolName}? other) {{");
sb.AppendLine(baseTypeName == "object"
? "return !ReferenceEquals(other, null) && this.GetType() == other.GetType()"
: $"return base.Equals(other as {baseTypeName})");
foreach (var property in symbol.GetProperties())
{
BuildPropertyEquality(attributesMetadata, sb, property);
}
sb.AppendLine(";");
sb.AppendLine("}");
sb.AppendLine("#nullable restore");
}
static void BuildGetHashCode(ITypeSymbol symbol, AttributesMetadata attributesMetadata, StringBuilder sb, bool explicitMode)
{
var baseTypeName = symbol.BaseType?.ToFQF();
sb.AppendLine(InheritDocComment);
sb.AppendLine(GeneratedCodeAttributeDeclaration);
sb.AppendLine(@"public override int GetHashCode() {
var hashCode = new global::System.HashCode();
");
sb.AppendLine(baseTypeName == "object"
? "hashCode.Add(this.EqualityContract);"
: "hashCode.Add(base.GetHashCode());");
foreach (var property in symbol.GetProperties())
{
var propertyName = property.ToFQF();
if (propertyName == "EqualityContract")
{
continue;
}
BuildPropertyHashCode(property, attributesMetadata, sb, explicitMode);
}
sb.AppendLine("return hashCode.ToHashCode();");
sb.AppendLine("}");
}
static void BuildEquals(ITypeSymbol symbol, AttributesMetadata attributesMetadata, StringBuilder sb, bool explicitMode)
{
var symbolName = symbol.ToFQF();
var baseTypeName = symbol.BaseType?.ToFQF();
sb.AppendLine(EqualsOperatorCodeComment);
sb.AppendLine(GeneratedCodeAttributeDeclaration);
sb.AppendLine($"public static bool operator ==({symbolName}? left, {symbolName}? right) => global::System.Collections.Generic.EqualityComparer<{symbolName}?>.Default.Equals(left, right);");
sb.AppendLine(NotEqualsOperatorCodeComment);
sb.AppendLine(GeneratedCodeAttributeDeclaration);
sb.AppendLine($"public static bool operator !=({symbolName}? left, {symbolName}? right) => !(left == right);");
sb.AppendLine(InheritDocComment);
sb.AppendLine(GeneratedCodeAttributeDeclaration);
sb.AppendLine($"public override bool Equals(object? obj) => Equals(obj as {symbolName});");
sb.AppendLine(InheritDocComment);
sb.AppendLine(GeneratedCodeAttributeDeclaration);
sb.AppendLine($"public bool Equals({symbolName}? other) {{");
sb.AppendLine(baseTypeName == "object"
? "return !ReferenceEquals(other, null) && this.GetType() == other.GetType()"
: $"return base.Equals(other as {baseTypeName})");
foreach (var property in symbol.GetProperties())
{
BuildPropertyEquality(attributesMetadata, sb, property, explicitMode);
}
sb.AppendLine(";");
sb.AppendLine("}");
}
public static string Generate(ITypeSymbol symbol, AttributesMetadata attributesMetadata)
{
var code = ContainingTypesBuilder.Build(symbol, includeSelf: true, content: sb =>
{
BuildEquals(symbol, attributesMetadata, sb);
BuildGetHashCode(symbol, attributesMetadata, sb);
});
return(code);
}
public static string Generate(ITypeSymbol symbol, AttributesMetadata attributesMetadata)
{
var code = ContainingTypesBuilder.Build(symbol, includeSelf: false, content: sb =>
{
var typeName = symbol.ToDisplayString(SymbolDisplayFormat.MinimallyQualifiedFormat);
sb.AppendLine($"partial class {typeName} : global::System.IEquatable<{typeName}> {{");
BuildEquals(symbol, attributesMetadata, sb);
BuildGetHashCode(symbol, attributesMetadata, sb);
sb.AppendLine("}");
});
return(code);
}
public static string Generate(ITypeSymbol symbol, AttributesMetadata attributesMetadata, bool explicitMode)
{
var code = ContainingTypesBuilder.Build(symbol, includeSelf: true, content: sb =>
{
sb.AppendLine(EnableNullableContext);
sb.AppendLine(SuppressObsoleteWarningsPragma);
BuildEquals(symbol, attributesMetadata, sb, explicitMode);
BuildGetHashCode(symbol, attributesMetadata, sb, explicitMode);
sb.AppendLine(RestoreObsoleteWarningsPragma);
sb.AppendLine(RestoreNullableContext);
});
return(code);
}
public static void BuildPropertyHashCode(IPropertySymbol property, AttributesMetadata attributesMetadata,
StringBuilder sb)
{
if (property.HasAttribute(attributesMetadata.IgnoreEquality))
{
return;
}
var propertyName = property.ToFQF();
var typeName = property.Type.ToNullableFQF();
sb.Append($"hashCode.Add(this.{propertyName}!, ");
if (property.HasAttribute(attributesMetadata.UnorderedEquality))
{
var types = property.GetIDictionaryTypeArguments();
if (types != null)
{
sb.Append(
$"global::Generator.Equals.DictionaryEqualityComparer<{string.Join(", ", types.Value)}>.Default");
}
else
{
types = property.GetIEnumerableTypeArguments() !;
sb.Append(
$"global::Generator.Equals.UnorderedEqualityComparer<{string.Join(", ", types.Value)}>.Default");
}
}
else if (property.HasAttribute(attributesMetadata.OrderedEquality))
{
var types = property.GetIEnumerableTypeArguments() !;
sb.Append(
$"global::Generator.Equals.OrderedEqualityComparer<{string.Join(", ", types.Value)}>.Default");
}
else if (property.HasAttribute(attributesMetadata.ReferenceEquality))
{
sb.Append($"global::Generator.Equals.ReferenceEqualityComparer<{typeName}>.Default");
}
else
{
sb.Append($"global::System.Collections.Generic.EqualityComparer<{typeName}>.Default");
}
sb.AppendLine(");");
}
public static string Generate(ITypeSymbol symbol, AttributesMetadata attributesMetadata, bool explicitMode)
{
var code = ContainingTypesBuilder.Build(symbol, includeSelf: false, content: sb =>
{
var typeName = symbol.ToDisplayString(SymbolDisplayFormat.MinimallyQualifiedFormat);
sb.AppendLine($"partial class {typeName} : global::System.IEquatable<{typeName}> {{");
sb.AppendLine(EnableNullableContext);
sb.AppendLine(SuppressObsoleteWarningsPragma);
BuildEquals(symbol, attributesMetadata, sb, explicitMode);
BuildGetHashCode(symbol, attributesMetadata, sb, explicitMode);
sb.AppendLine(RestoreObsoleteWarningsPragma);
sb.AppendLine(RestoreNullableContext);
sb.AppendLine("}");
});
return(code);
}
public static void BuildPropertyEquality(AttributesMetadata attributesMetadata, StringBuilder sb,
IPropertySymbol property, bool explicitMode)
{
if (property.HasAttribute(attributesMetadata.IgnoreEquality))
{
return;
}
var propertyName = property.ToFQF();
var typeName = property.Type.ToNullableFQF();
if (property.HasAttribute(attributesMetadata.UnorderedEquality))
{
var types = property.GetIDictionaryTypeArguments();
if (types != null)
{
sb.AppendLine(
$"&& global::Generator.Equals.DictionaryEqualityComparer<{string.Join(", ", types.Value)}>.Default.Equals({propertyName}!, other.{propertyName}!)");
}
else
{
types = property.GetIEnumerableTypeArguments() !;
sb.AppendLine(
$"&& global::Generator.Equals.UnorderedEqualityComparer<{string.Join(", ", types.Value)}>.Default.Equals({propertyName}!, other.{propertyName}!)");
}
}
else if (property.HasAttribute(attributesMetadata.OrderedEquality))
{
var types = property.GetIEnumerableTypeArguments() !;
sb.AppendLine(
$"&& global::Generator.Equals.OrderedEqualityComparer<{string.Join(", ", types.Value)}>.Default.Equals({propertyName}!, other.{propertyName}!)");
}
else if (property.HasAttribute(attributesMetadata.ReferenceEquality))
{
sb.AppendLine(
$"&& global::Generator.Equals.ReferenceEqualityComparer<{typeName}>.Default.Equals({propertyName}!, other.{propertyName}!)");
}
else if (property.HasAttribute(attributesMetadata.SetEquality))
{
var types = property.GetIEnumerableTypeArguments() !;
sb.AppendLine(
$"&& global::Generator.Equals.SetEqualityComparer<{string.Join(", ", types.Value)}>.Default.Equals({propertyName}!, other.{propertyName}!)");
}
else if (property.HasAttribute(attributesMetadata.CustomEquality))
{
var attribute = property.GetAttribute(attributesMetadata.CustomEquality);
var comparerType = (INamedTypeSymbol)attribute?.ConstructorArguments[0].Value !;
var comparerMemberName = (string)attribute?.ConstructorArguments[1].Value !;
if (comparerType.GetMembers().Any(x => x.Name == comparerMemberName && x.IsStatic) || comparerType.GetProperties().Any(x => x.Name == comparerMemberName && x.IsStatic))
{
sb.AppendLine(
$"&& {comparerType.ToFQF()}.{comparerMemberName}.Equals({propertyName}!, other.{propertyName}!)");
}
else
{
sb.AppendLine(
$"&& new {comparerType.ToFQF()}().Equals({propertyName}!, other.{propertyName}!)");
}
}
else if (
!explicitMode ||
property.HasAttribute(attributesMetadata.DefaultEquality))
{
sb.AppendLine(
$"&& global::System.Collections.Generic.EqualityComparer<{typeName}>.Default.Equals({propertyName}!, other.{propertyName}!)");
}
}