/// <summary>
/// <code>
/// sigo.Get("user/name") => sigo.Get1("user").Get1("name")
/// sigo.Get("user") => sigo.Get1("user")
/// sigo.Get("/") => sigo
/// </code>
/// </summary>
public static ISigo Get(ISigo sigo, string path)
{
if (IsLooped(sigo))
{
return(sigo);
}
if (string.IsNullOrEmpty(path))
{
return(sigo);
}
if (!path.Contains('/'))
{
return(sigo.Get1(path));
}
var keys = path.Split(new[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
foreach (var key in keys)
{
sigo = sigo.Get1(key);
if (IsLooped(sigo))
{
return(sigo);
}
}
return(sigo);
}
/// <summary>
/// try to return part of a if a is frozen
/// try to return part of b if b is frozen
/// return new sigo
/// </summary>
public static ISigo Merge(ISigo a, ISigo b)
{
ISigo r;
if (b is SigoLeaf)
{
r = b;
return(Select(r, a, b));
}
if (a is SigoLeaf)
{
if ((b.Flags & Bits.M) == 0)
{
r = a;
return(Select(r, a, b));
}
r = Merge(Sigo.Create(Bits.LMR), b);
return(Select(r, a, b));
}
r = Sigo.Create(Bits.Proton(a.Flags | b.Flags));
var keys = a.Keys.Union(b.Keys);
foreach (var key in keys)
{
r = r.Set1(key, Merge(a.Get1(key), b.Get1(key)));
}
return(Select(r, a, b));
}
public static ISigo SetN(ISigo sigo, IReadOnlyList <string> keys, ISigo value, int start)
{
switch (keys.Count - start)
{
case 0: return(value);
case 1: return(sigo.Set1(keys[start], value));
default: {
var key = keys[start];
return(sigo.Set1(key, SetN(sigo.Get1(key), keys, value, start + 1)));
}
}
}
public static bool Equals(ISigo a, ISigo b)
{
if (ReferenceEquals(a, b))
{
return(true);
}
if (Bits.IsSame(a.Flags, b.Flags) == false)
{
return(false);
}
return(Bits.IsLeaf(a.Flags)
? Equals(a.Data, b.Data)
: a.All(e => Equals(e.Value, b.Get1(e.Key))));
}
