Monday
Jan102011
IEnumerable & IObservable Split ()
Monday, January 10, 2011 at 9:00AM Another IObservable<> extension method I needed was Split – just like string.Split (), but generically for any array and an IObservable<T[]>. I started first with a generic IEnumberable<T> Split<T> ():
/// <summary>
/// Returns one or more arrays that contains the subarrays in this
/// instance that are delimited by elements of a specified array.
/// </summary>
/// <typeparam name="T">type of the array</typeparam>
/// <param name="value">value to split</param>
/// <param name="separator">one or more separators</param>
/// <remarks>not efficient with separator lengths > 1</remarks>
/// <returns></returns>
public static IEnumerable<T[]> Split<T> (this T[] value, params T[] separator) {
int separatorLength = separator.Length;
int startingIndex = 0;
int index = -1;
int length;
do {
/* loop through each item in the separator
* array verifing it exists in the source array */
for (int i = 0; i < separatorLength; i++) {
index = Array.IndexOf (value, separator[i], startingIndex);
if (-1 == index)
break;
}
if (-1 < index) {
// delimiter matched successfully
length = index - startingIndex;
T[] output = new T[length];
Array.Copy (value, startingIndex, output, 0, length);
yield return output;
startingIndex = index + 1;
}
} while (-1 < index);
if (0 == startingIndex)
// no match, send entire value
yield return value;
else {
// no more matches, send items left
length = value.Length - startingIndex;
T[] output = new T[length];
Array.Copy (value, startingIndex, output, 0, length);
}
}
Now that I can split an array, I need to an IObservable<T[]> Split() as well:
/// <summary>
/// Splits the arrays from the source observable by the separator
/// </summary>
/// <typeparam name="TSource">type of the source array</typeparam>
/// <param name="source">source array</param>
/// <param name="separator">the separator(s)</param>
/// <returns>An observable containing the same number of items (if the
/// separator(s) are not found) or additional items by spliting the incoming
/// arrays</returns>
public static IObservable<TSource[]> Split<TSource> (
this IObservable<TSource[]> source, params TSource[][] separator) {
if (source == null)
throw new ArgumentNullException ("source", "source is null.");
if (separator.Length < 1)
throw new ArgumentOutOfRangeException ("separator");
IObservable<TSource[]> value = source;
/* foreach of the delimiter arrays passed in
* chain the call to Split () */
separator.Run (item => value = value.Split (item));
return value;
}
/// <summary>
/// Splits the arrays from the source observable by the delimiter
/// </summary>
/// <typeparam name="TSource">type of the source array</typeparam>
/// <param name="source">source array</param>
/// <param name="separator">the delimiter</param>
/// <returns>An observable containing the same number of items (if the
/// delimiter is not found) or additional items by spliting the incoming
/// arrays</returns>
public static IObservable<TSource[]> Split<TSource> (
this IObservable<TSource[]> source, params TSource[] separator) {
if (source == null)
throw new ArgumentNullException ("source");
if (separator.Length < 1)
throw new ArgumentOutOfRangeException ("delimiter");
return Observable.CreateWithDisposable<TSource[]> (observer =>
source.Subscribe<TSource[]> (value =>
value.Split (separator).Run (observer.OnNext),
observer.OnError, observer.OnCompleted)
);
}
Of course these extension methods can be further optimized and handle more use cases - especially by using IList<T> instead of array.
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