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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Boogie;
namespace Microsoft.Dafny {
class Util
{
public static string Comma<T>(IEnumerable<T> l, Func<T, string> f) {
return Comma(",", l, f);
}
public static string Comma<T>(string comma, IEnumerable<T> l, Func<T,string> f) {
string res = "";
string c = "";
foreach(var t in l) {
res += c + f(t);
c = comma;
}
return res;
}
public static List<B> Map<A,B>(IEnumerable<A> xs, Func<A,B> f)
{
List<B> ys = new List<B>();
foreach (A x in xs) {
ys.Add(f(x));
}
return ys;
}
public static List<A> Nil<A>() {
return new List<A>();
}
public static List<A> Singleton<A>(A x) {
return new List<A> { x };
}
public static List<A> Cons<A>(A x, List<A> xs) {
return Concat(Singleton(x), xs);
}
public static List<A> Snoc<A>(List<A> xs, A x) {
return Concat(xs, Singleton(x));
}
public static List<A> Concat<A>(List<A> xs, List<A> ys) {
List<A> cpy = new List<A>(xs);
cpy.AddRange(ys);
return cpy;
}
public static Dictionary<A,B> Dict<A,B>(IEnumerable<A> xs, IEnumerable<B> ys) {
return Dict<A,B>(xs.Zip(ys));
}
public static Dictionary<A,B> Dict<A,B>(IEnumerable<Tuple<A,B>> xys) {
Dictionary<A,B> res = new Dictionary<A,B>();
foreach (var p in xys) {
res[p.Item1] = p.Item2;
}
return res;
}
}
}
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