public static string Join(this Generic.IEnumerator <string> me, string separator)
{
System.Text.StringBuilder result = new System.Text.StringBuilder();
if (me.MoveNext())
{
result.Append(me.Current);
while (me.MoveNext())
{
result.Append(separator).Append(me.Current);
}
}
return(result.ToString());
}
public static async Tasks.Task <bool> Join(this ITextWriter me, Generic.IEnumerator <string> items, string separator = null)
{
bool result = items.MoveNext() && await me.Write(items.Current);
while (result && items.MoveNext())
{
if (separator.NotNull())
{
result &= await me.Write(separator);
}
result &= await me.Write(items.Current);
}
return(result);
}
public static Generic.IEnumerator <T> While <T>(this Generic.IEnumerator <T> me, Func <T, bool> predicate)
{
while (me.MoveNext() && predicate(me.Current))
{
yield return(me.Current);
}
}
public static string PercentDecode(this string me)
{
Text.Builder result = null;
if (me.NotNull())
{
Generic.IEnumerator <char> enumerator = me.GetEnumerator();
while (enumerator.MoveNext())
{
if (enumerator.Current == '%')
{
char[] characters = new char[] { enumerator.Next(), enumerator.Next() };
byte value;
if (byte.TryParse(new string(characters), System.Globalization.NumberStyles.HexNumber, System.Globalization.NumberFormatInfo.InvariantInfo, out value))
{
result += System.Text.Encoding.ASCII.GetChars(new byte[] { value });
}
else
{
result += "%" + characters;
}
}
else
{
result += enumerator.Current;
}
}
}
return(result);
}
public static void Apply <T>(this Generic.IEnumerator <T> me, Action <T> function)
{
while (me.MoveNext())
{
function(me.Current);
}
}
public static Generic.IEnumerator <S> Map <T, S>(this Generic.IEnumerator <T> me, Func <T, S> function)
{
while (me.MoveNext())
{
yield return(function(me.Current));
}
}
/// <summary>
/// Skip the next <paramref name="count"/> elements in <paramref name="me"/>.
/// </summary>
/// <param name="me">Enumerator to skip in.</param>
/// <param name="count">Number of elements to skip.</param>
/// <typeparam name="T">Any type.</typeparam>
public static Generic.IEnumerator <T> Skip <T>(this Generic.IEnumerator <T> me, int count)
{
while (count > 0 && me.MoveNext())
{
count--;
}
return(me);
}
public static Generic.IEnumerable <byte> Encode(this Generic.IEnumerable <char> me, Encoding encoding)
{
Generic.IEnumerator <byte> enumerator = me.GetEnumerator().Encode(encoding);
while (enumerator.MoveNext())
{
yield return(enumerator.Current);
}
}
public static S Fold <T, S>(this Generic.IEnumerator <T> me, Func <T, S, S> function, S initial)
{
while (me.MoveNext())
{
initial = function(me.Current, initial);
}
return(initial);
}
public static bool All <T>(this Generic.IEnumerable <T> me, Func <T, bool, bool> function)
{
bool result = true;
Generic.IEnumerator <T> enumerator = me.GetEnumerator();
bool notLast = enumerator.MoveNext();
while (notLast)
{
T current = enumerator.Current;
if (!function(current, !(notLast = enumerator.MoveNext())))
{
result = false;
break;
}
}
return(result);
}
public static int Count <T>(this Generic.IEnumerator <T> me)
{
int result = 0;
while (me.MoveNext())
{
result++;
}
return(result);
}
public static Generic.IEnumerator <TResult> Zip <TLeft, TRight, TResult>(this Generic.IEnumerator <TLeft> me, Generic.IEnumerator <TRight> other, Func <TLeft, TRight, TResult> combine)
{
if (me.NotNull() && other.NotNull() && combine.NotNull())
{
while (me.MoveNext() && other.MoveNext())
{
yield return(combine(me.Current, other.Current));
}
}
}
public static Generic.IEnumerator <byte> Encode(this Generic.IEnumerator <char> me, Encoding encoding)
{
while (me.MoveNext())
{
foreach (var b in encoding.Encode(me.Current))
{
yield return(b);
}
}
}
public static string Join(this Generic.IEnumerable <string> me)
{
System.Text.StringBuilder result = new System.Text.StringBuilder();
Generic.IEnumerator <string> enumerator = me.GetEnumerator();
while (enumerator.MoveNext())
{
result.Append(enumerator.Current);
}
return(result.ToString());
}
/// <summary>
/// Return new enumerator containing the next <paramref name="count"/> elements in <paramref name="me"/>.
/// </summary>
/// <param name="me">Enumerator to read from.</param>
/// <param name="count">Number of elements read.</param>
/// <typeparam name="T">Any type.</typeparam>
public static Generic.IEnumerator <T> Read <T>(this Generic.IEnumerator <T> me, int count)
{
if (count > 0)
{
do
{
yield return(me.Current);
}while (--count > 0 && me.MoveNext());
}
}
public static IList <T> Add <T>(this IList <T> me, Generic.IEnumerator <T> items)
{
if (items.NotNull())
{
while (items.MoveNext())
{
me.Add(items.Current);
}
}
return(me);
}
public static Generic.IEnumerable <char> Decode(this Generic.IEnumerable <byte> me, System.Text.Encoding encoding)
{
//if (encoding == System.Text.Encoding.UTF8)
{
byte[] buffer = new byte[6];
int length = 0;
Generic.IEnumerator <byte> enumerator = me.GetEnumerator();
while (enumerator.MoveNext())
{
buffer[0] = enumerator.Current;
length =
buffer[0] < 0x80 ? 1 :
buffer[0] < 0xc0 ? 0 :
buffer[0] < 0xe0 ? 2 :
buffer[0] < 0xf0 ? 3 :
buffer[0] < 0xf8 ? 4 :
buffer[0] < 0xfc ? 5 :
6;
if (length > 0)
{
int i = 1;
for (; i < length && enumerator.MoveNext(); i++)
{
buffer[i] = enumerator.Current;
}
if (length == 3 && buffer[0] == 0xef && buffer[1] == 0xbb && buffer[2] == 0xbf)
{
length = 0; // Skip "zero width no break space" (0xefbbbf)
//yield return ;
}
if (i == length)
{
foreach (char c in encoding.GetChars(buffer, 0, length))
{
yield return(c);
}
}
}
}
}
}
public char?Decode(Generic.IEnumerator <byte> data)
{
return(this.Decode(() =>
{
byte?result = null;
if (data.MoveNext())
{
result = data.Current;
}
return result;
}));
}
public static S Find <T, S>(this Generic.IEnumerator <T> me, Func <T, S> function)
{
S result = default(S);
while (me.MoveNext())
{
if ((result = function(me.Current)) != null)
{
break;
}
}
return(result);
}
public static T Find <T>(this Generic.IEnumerator <T> me, Func <T, bool> function)
{
T result = default(T);
while (me.MoveNext())
{
if (function(me.Current))
{
result = me.Current;
break;
}
}
return(result);
}
public static bool All <T>(this Generic.IEnumerator <T> me, Func <T, bool> function)
{
bool result = true;
while (me.MoveNext())
{
if (!function(me.Current))
{
result = false;
break;
}
}
return(result);
}
public static T First <T>(this Generic.IEnumerator <T> me)
{
T result;
if (me.NotNull())
{
result = me.MoveNext() ? me.Current : default(T);
me.Dispose();
}
else
{
result = default(T);
}
return(result);
}
static T[] ToArray <T>(this Generic.IEnumerator <T> me, int count)
{
T[] result;
if (me.MoveNext())
{
var head = me.Current;
result = me.ToArray(count + 1);
result[count] = head;
}
else
{
result = new T[count];
}
return(result);
}
public static T First <T>(this Generic.IEnumerable <T> me)
{
T result;
if (me.NotNull())
{
using (Generic.IEnumerator <T> enumerator = me.GetEnumerator())
result = enumerator.MoveNext() ? enumerator.Current : default(T);
}
else
{
result = default(T);
}
return(result);
}
public static bool Contains <T>(this Generic.IEnumerator <T> me, params T[] needles)
where T : IEquatable <T>
{
bool result = false;
while (me.MoveNext())
{
if (needles.Contains(me.Current))
{
result = true;
break;
}
}
return(result);
}
public static T?FirstOrNull <T>(this Generic.IEnumerable <T> me)
where T : struct
{
T?result;
if (me.NotNull())
{
using (Generic.IEnumerator <T> enumerator = me.GetEnumerator())
result = enumerator.MoveNext() ? enumerator.Current : default(T);
}
else
{
result = null;
}
return(result);
}
public static Generic.IEnumerator <T> Append <T>(this Generic.IEnumerator <T> me, Generic.IEnumerator <T> other)
{
if (me.NotNull())
{
while (me.MoveNext())
{
yield return(me.Current);
}
}
if (other.NotNull())
{
while (other.MoveNext())
{
yield return(other.Current);
}
}
}
/// <summary>
/// Skip past the first occurance of separator.
/// </summary>
/// <param name="me">Enumerator to skip on.</param>
/// <param name="separator">Separator to skip past. Shall not contain null.</param>
/// <typeparam name="T">Any type implementing <c>IEquatable</c>.</typeparam>
public static Generic.IEnumerator <T> Skip <T>(this Generic.IEnumerator <T> me, params T[] separator)
where T : IEquatable <T>
{
int position = 0;
while (me.MoveNext())
{
if (!me.Current.Equals(separator[position++]))
{
position = 0;
}
else if (separator.Length == position)
{
break;
}
}
return(me);
}
public static int Index <T>(this Generic.IEnumerator <T> me, Func <T, bool> function)
{
int result = -1;
int i = 0;
while (me.MoveNext())
{
if (function(me.Current))
{
result = i;
break;
}
else
{
i++;
}
}
return(result);
}
/// <summary>
/// Create an enumerator containing all elements in <paramref name="me"/> until <paramref name="separator"/>.
/// </summary>
/// <param name="me">Enumerator to read from.</param>
/// <param name="separator">Separator to read from and move past.</param>
/// <typeparam name="T">Any type implementing <c>IEquatable</c>.</typeparam>
public static Generic.IEnumerator <T> Read <T>(this Generic.IEnumerator <T> me, params T[] separator)
where T : IEquatable <T>
{
int position = 0;
while (me.MoveNext())
{
if (!me.Current.Equals(separator[position++]))
{
for (int i = 0; i < position - 1; i++)
{
yield return(separator[i]);
}
yield return(me.Current);
position = 0;
}
else if (separator.Length == position)
{
yield break;
}
}
}
