|
public static GetTypeParameters ( int args, bool ret ) : IEnumerable |
||
| args | int | |
| ret | bool | |
| return | IEnumerable |
|
static CodeMemberMethod CreateMethod(string name, CodeTypeReference type, string arg, int argc, bool tret)
{
var m = new CodeMemberMethod()
{
Attributes = MemberAttributes.Static | MemberAttributes.Public,
Name = name,
ReturnType = type,
};
m.TypeParameters.AddRange(Types.GetTypeParameters(argc, tret));
m.Parameters.Add(new CodeParameterDeclarationExpression(type, arg));
m.Statements.Add(new CodeMethodReturnStatement(new CodeVariableReferenceExpression(arg)));
return(m);
}
static CodeMemberMethod RecFunc(int args)
{
var t = Types.Func(args);
var m = new CodeMemberMethod()
{
Attributes = MemberAttributes.Static | MemberAttributes.Public,
Name = "RecFunc",
ReturnType = t,
};
m.TypeParameters.AddRange(Types.GetTypeParameters(args, true).ToArray());
var a = "lambda";
m.Parameters.Add(new CodeParameterDeclarationExpression(new CodeTypeReference("Func", t, t), a));
m.Statements.ThrowWhenArgumentIsNull(a);
var expr = AppendArgs(new StringBuilder(), args);
expr.Append(" => lambda (RecFunc (lambda))");
AppendArgs(expr, args);
m.Statements.Add(new CodeMethodReturnStatement(new CodeSnippetExpression(expr.ToString())));
m.Comments.AddRange("From: http://blogs.msdn.com/madst/archive/2007/05/11/recursive-lambda-expressions.aspx");
m.Comments.AddDocs(
XmlDocs.TypeParams(m.TypeParameters, t),
XmlDocs.Param("lambda", "The " + XmlDocs.See(t) + " to use."),
XmlDocs.Summary("Creates a " + XmlDocs.See(t) + " delegate, which may be recursive."),
XmlDocs.Returns("Returns a " + XmlDocs.See(t) + " which (eventually) invokes <paramref name=\"lambda\"/>."),
XmlDocs.ArgumentNullException("lambda"),
XmlDocs.Remarks(
"<para>",
" The following example makes use of a recursive lambda:",
"</para>",
"<code lang=\"C#\">",
" Func<int, int> factorial = Lambda.RecFunc<int, int> (".Replace("<", "<"),
" fac => x => x == 0 ? 1 : x * fac (x-1));",
" Console.WriteLine (factorial (5)); // prints \"120\"",
"</code>"
)
);
return(m);
}
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);
}
