JavaTypeName.cs

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using System;
 
using IKVM.Runtime.Extensions;
 
namespace IKVM.Runtime.Syntax
{
 
    readonly struct JavaTypeName
    {
 
        public static JavaTypeName Empty => new(ReadOnlyMemory<char>.Empty);
 
        public static implicit operator string(JavaTypeName typeName) => typeName.ToString();
        public static implicit operator JavaTypeName(string typeName) => new(typeName);
 
        public static implicit operator ReadOnlyMemory<char>(JavaTypeName typeName) => typeName.value;
        public static implicit operator JavaTypeName(ReadOnlyMemory<char> typeName) => new(typeName);
 
        public static bool operator ==(JavaTypeName a, JavaTypeName b) => a.value.Span.Equals(b.value.Span, StringComparison.Ordinal);
        public static bool operator !=(JavaTypeName a, JavaTypeName b) => a.value.Span.Equals(b.value.Span, StringComparison.Ordinal) == false;
 
        readonly ReadOnlyMemory<char> value;
 
        public JavaTypeName(string value) :
            this(value.AsMemory())
        {
            if (value is null)
                throw new ArgumentNullException(nameof(value));
        }
 
        public JavaTypeName(ReadOnlyMemory<char> value)
        {
            this.value = value;
        }
 
        public JavaTypeName(JavaPackageName package, JavaUnqualifiedTypeName name) :
            this(package.IsEmpty ? name.Value : (package + '.' + name).AsMemory())
        {
 
        }
 
        public ReadOnlyMemory<char> Value => value;
 
        public bool IsEmpty => value.IsEmpty;
 
        public JavaPackageName PackageName => GetPackageName();
 
        JavaPackageName GetPackageName()
        {
            var i = value.Span.LastIndexOf('.');
            if (i != -1)
                return new JavaPackageName(value.Slice(0, i));
            else
                return new JavaPackageName("");
        }
 
        public JavaUnqualifiedTypeName UnqualifiedName => GetUnqualifiedName();
 
        JavaUnqualifiedTypeName GetUnqualifiedName()
        {
            var index = value.Span.LastIndexOf('.');
            return index != -1 ? new JavaUnqualifiedTypeName(value.Slice(index + 1)) : new JavaUnqualifiedTypeName(value);
        }
 
        public JavaSimpleTypeName SimpleName => GetSimpleName();
 
        JavaSimpleTypeName GetSimpleName()
        {
            if (IsEmpty)
                return JavaSimpleTypeName.Empty;
            if (IsAnonymousClass)
                return JavaSimpleTypeName.Empty;
 
            var index = value.Span.LastIndexOfAny('.', '$');
            return index != -1 ? new JavaSimpleTypeName(value.Slice(index + 1)) : new JavaSimpleTypeName(value);
        }
 
        public bool IsMemberOf(JavaPackageName packageName) => PackageName == packageName;
 
        public bool IsInnerClass => UnqualifiedName.IsInnerClass;
 
        public bool IsNestedClass => UnqualifiedName.IsNestedClass;
 
        public bool IsAnonymousClass => UnqualifiedName.IsAnonymousClass;
 
        public bool IsLocalClass => UnqualifiedName.IsLocalClass;
 
        public JavaTypeName Parent => GetParent();
 
        JavaTypeName GetParent()
        {
            var b = value.Span.LastIndexOf('$');
            return b != -1 ? new JavaTypeName(value.Slice(0, b)) : Empty;
        }
 
        public bool Equals(JavaTypeName other) => value.Span.Equals(other.value.Span, StringComparison.Ordinal);
 
        public override bool Equals(object obj) => false;
 
        public override int GetHashCode() => value.Span.GetHashCodeExtension();
 
        public override string ToString() => value.Span.ToString();
 
    }
 
}