void AddFoldDocs(CodeTypeDeclaration type, CodeMemberMethod method, int n)
{
method.Comments.AddDocs(
XmlDocs.TypeParam("TResult",
" The type to convert the " + XmlDocs.See(DefaultNamespace, type) + " to."
),
GetFoldParametersDocs(type, n),
XmlDocs.Summary(
" Converts a " + XmlDocs.See(DefaultNamespace, type) + " into a <typeparamref name=\"TResult\" /> value."
),
XmlDocs.Returns(
" A <typeparamref name=\"TResult\" /> as generated by one",
" of the conversion delegate parameters."
),
XmlDocs.Remarks(
" <para>",
" Converts a " + XmlDocs.See(DefaultNamespace, type) + " into a <typeparamref name=\"TResult\" />",
" by invoking one of the provided delegate parameters.",
" </para>",
" <para>",
" The parameter which is invoked is predicated upon the internal position of",
" the value held. For example, if the internal value is in the first position ",
" (i.e. " + XmlDocs.See(DefaultNamespace, type, type.GetMethods(A(0)).First()),
" was used to create the " + XmlDocs.See(DefaultNamespace, type) + " instance), then",
" <paramref name=\"a\" /> (the first delegate parameter) will be invoked to",
" convert the <typeparamref name=\"T1\" /> into a ",
" <typeparamref name=\"TResult\" />.",
" </para>"
),
XmlDocs.ArgumentNullException(Enumerable.Range(0, n).Select(v => a(v)))
);
}
void AddCreatorDocs(CodeTypeDeclaration type, CodeMemberMethod method, int w, int n)
{
var tp = Types.GetTypeParameter(w, n);
var idx = XmlDocs.GetIndex(tp);
var fold = type.GetMethods("Fold").First();
method.Comments.AddDocs(
XmlDocs.Param("value",
" A <typeparamref name=\"" + tp + "\" /> containing the value",
" to provide to the " + idx,
" " + XmlDocs.See(DefaultNamespace, type, fold),
" delegate."
),
XmlDocs.Summary(
" Creates a " + XmlDocs.See(DefaultNamespace, type) + " instance which",
" holds a <typeparamref name=\"" + tp + "\" /> value."
),
XmlDocs.Returns(
" A " + XmlDocs.See(DefaultNamespace, type) + " instance which holds a ",
" holds a <typeparamref name=\"" + tp + "\" /> value."
),
XmlDocs.Remarks(
" <para>",
" When",
" " + XmlDocs.See(DefaultNamespace, type, fold),
" is invoked,",
" the returned " + XmlDocs.See(DefaultNamespace, type) + " instance",
" will invoke the " + idx + " delegate",
" for conversions.",
" </para>"
),
XmlDocs.ArgumentNullException("value")
);
}
IEnumerable <string> GetCreators(CodeTypeDeclaration type, int n)
{
for (int i = 0; i < n; ++i)
{
yield return(" <item><term><see cref=\"" +
XmlDocs.Cref(DefaultNamespace, type, type.GetMethods(A(i)).First()) +
"\" /></term></item>");
}
}
IEnumerable <string> GetCreators(CodeTypeDeclaration type, int n)
{
var targs = Types.GetTypeParameterList(n);
var targsc = string.Join(",", Enumerable.Range(0, n).Select(p => "`" + p).ToArray());
for (int i = 0; i < n; ++i)
{
yield return(" <item><term><see cref=\"" +
XmlDocs.Cref(DefaultNamespace, type, type.GetMethods(A(i)).First()) +
"\" /></term></item>");
yield return(" <item><term><see cref=\"M:Cadenza.Either{" + targs +
"}.op_Implicit(`" + i + ")~Cadenza.Either{" + targsc + "}\" /></term></item>");
}
}
CodeTypeDeclaration CreateEither(int n)
{
var either = new CodeTypeDeclaration("Either")
{
TypeAttributes = TypeAttributes.Public | TypeAttributes.Abstract,
};
either.BaseTypes.Add(new CodeTypeReference("IEquatable", GetEitherType(n)));
either.TypeParameters.AddRange(Types.GetTypeParameters(n, false));
either.Members.Add(new CodeConstructor()
{
Attributes = MemberAttributes.Private,
});
for (int i = 0; i < n; ++i)
{
either.Members.Add(CreateCreator(either, i, n));
}
either.Members.Add(CreateFold(either, n));
either.Members.Add(CreateCheckFolders(n));
either.Members.Add(CreateEqualsObject());
either.Members.Add(CreateEquals(n));
either.Members.Add(CreateGetHashCode());
for (int i = 0; i < n; ++i)
{
either.Members.Add(CreateHandler(i, n));
}
either.Comments.AddDocs(
XmlDocs.TypeParams(either.TypeParameters),
XmlDocs.Summary("A union of " + n + " values."),
"<remarks>",
" <para>",
" An <c>Either</c> is an immutable, strongly typed union of variously ",
" typed values with each value lacking an otherwise meaningful name aside ",
" from its position, which is not exposed. It stores only one (non-null) ",
" value from a set of types (as determined by the type parameter list).",
" </para>",
" <para>",
" The value held by a " + XmlDocs.See(DefaultNamespace, either) + " instance",
" can be converted into a value by using the ",
" <see cref=\"" + XmlDocs.Cref(DefaultNamespace, either, either.GetMethods("Fold").First()) + "\" /> method.",
" <c>Fold</c> takes a list of delegates to perform the conversion; the",
" delegate used to perform the conversion is based upon the internal ",
" position of the value stored.",
" </para>",
" <para>",
" <c>Either</c> instances are created through one of the following",
" creation methods:",
" </para>",
" <list type=\"bullet\">",
GetCreators(either, n),
" </list>",
" <code lang=\"C#\">",
" var a = Either<double, string>.A (Math.PI); // value stored in 1st position",
" ",
" int r = a.Fold (",
" v => (int) v, // 1st position converter",
" v => v.Length); // 2nd position converter",
" ",
" Console.WriteLine (r); // prints 3</code>",
"</remarks>"
);
for (int i = 0; i < n; ++i)
{
AddCreatorDocs(either, either.GetMethods(A(i)).First(), i, n);
}
AddFoldDocs(either, either.GetMethods("Fold").First(), n);
AddEqualsObjectDocs(either,
either.GetMethods("Equals").First(m => m.Parameters [0].Type.BaseType == "System.Object"), n);
AddEqualsDocs(either,
either.GetMethods("Equals").First(m => m.Parameters [0].Type.BaseType != "System.Object"), n);
AddGetHashCodeDocs(either, either.GetMethods("GetHashCode").First(), n);
return(either);
}
