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Split.cs
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Split.cs
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namespace SuperLinq;
public static partial class SuperEnumerable
{
/// <summary>
/// Splits the source sequence by a separator.
/// </summary>
/// <typeparam name="TSource">
/// Type of element in the source sequence.
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="separator">
/// Separator element.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> is <see langword="null"/>.
/// </exception>
/// <returns>
/// A sequence of splits of elements.
/// </returns>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution and streams the groupings. The grouping elements,
/// however, are buffered. Each grouping is therefore yielded as soon as it is complete and before the next
/// grouping occurs.
/// </para>
/// </remarks>
public static IEnumerable<IReadOnlyList<TSource>> Split<TSource>(
this IEnumerable<TSource> source,
TSource separator
)
{
return Split(source, separator, count: int.MaxValue);
}
/// <summary>
/// Splits the source sequence by a separator given a maximum count of splits.
/// </summary>
/// <typeparam name="TSource">
/// Type of element in the source sequence.
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="separator">
/// Separator element.
/// </param>
/// <param name="count">
/// Maximum number of splits.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="count"/> is less than <c>1</c>.
/// </exception>
/// <returns>
/// A sequence of splits of elements.
/// </returns>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution and streams the groupings. The grouping elements,
/// however, are buffered. Each grouping is therefore yielded as soon as it is complete and before the next
/// grouping occurs.
/// </para>
/// </remarks>
public static IEnumerable<IReadOnlyList<TSource>> Split<TSource>(
this IEnumerable<TSource> source,
TSource separator,
int count
)
{
return Split(source, separator, count, Identity);
}
/// <summary>
/// Splits the source sequence by a separator and then transforms the splits into results.
/// </summary>
/// <typeparam name="TSource">
/// Type of element in the source sequence.
/// </typeparam>
/// <typeparam name="TResult">
/// Type of the result sequence elements.
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="separator">
/// Separator element.
/// </param>
/// <param name="resultSelector">
/// Function used to project splits of source elements into elements of the resulting sequence.
/// </param>
/// <returns>
/// A sequence of values typed as <typeparamref name="TResult"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> or <paramref name="resultSelector"/> is <see langword="null"/>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution and streams the groupings. The grouping elements,
/// however, are buffered. Each grouping is therefore yielded as soon as it is complete and before the next
/// grouping occurs.
/// </para>
/// </remarks>
public static IEnumerable<TResult> Split<TSource, TResult>(
this IEnumerable<TSource> source,
TSource separator,
Func<IReadOnlyList<TSource>, TResult> resultSelector
)
{
return Split(source, separator, count: int.MaxValue, resultSelector);
}
/// <summary>
/// Splits the source sequence by a separator, given a maximum count of splits, and then transforms the splits
/// into results.
/// </summary>
/// <typeparam name="TSource">
/// Type of element in the source sequence.
/// </typeparam>
/// <typeparam name="TResult">
/// Type of the result sequence elements.
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="separator">
/// Separator element.
/// </param>
/// <param name="count">
/// Maximum number of splits.
/// </param>
/// <param name="resultSelector">
/// Function used to project splits of source elements into elements of the resulting sequence.
/// </param>
/// <returns>
/// A sequence of values typed as <typeparamref name="TResult"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> or <paramref name="resultSelector"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="count"/> is less than <c>1</c>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution and streams the groupings. The grouping elements,
/// however, are buffered. Each grouping is therefore yielded as soon as it is complete and before the next
/// grouping occurs.
/// </para>
/// </remarks>
public static IEnumerable<TResult> Split<TSource, TResult>(
this IEnumerable<TSource> source,
TSource separator, int count,
Func<IReadOnlyList<TSource>, TResult> resultSelector
)
{
return Split(source, separator, comparer: null, count, resultSelector);
}
/// <summary>
/// Splits the source sequence by a separator and then transforms the splits into results.
/// </summary>
/// <typeparam name="TSource">
/// Type of element in the source sequence.
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="separator">
/// Separator element.
/// </param>
/// <param name="comparer">
/// Comparer used to determine separator element equality.
/// </param>
/// <returns>
/// A sequence of splits of elements.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> is <see langword="null"/>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution and streams the groupings. The grouping elements,
/// however, are buffered. Each grouping is therefore yielded as soon as it is complete and before the next
/// grouping occurs.
/// </para>
/// </remarks>
public static IEnumerable<IReadOnlyList<TSource>> Split<TSource>(
this IEnumerable<TSource> source,
TSource separator,
IEqualityComparer<TSource>? comparer
)
{
return Split(source, separator, comparer, count: int.MaxValue);
}
/// <summary>
/// Splits the source sequence by a separator, given a maximum count of splits. A parameter specifies how the
/// separator is compared for equality.
/// </summary>
/// <typeparam name="TSource">
/// Type of element in the source sequence.
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="separator">
/// Separator element.
/// </param>
/// <param name="comparer">
/// Comparer used to determine separator element equality.
/// </param>
/// <param name="count">
/// Maximum number of splits.
/// </param>
/// <returns>
/// A sequence of splits of elements.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="count"/> is less than <c>1</c>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution and streams the groupings. The grouping elements,
/// however, are buffered. Each grouping is therefore yielded as soon as it is complete and before the next
/// grouping occurs.
/// </para>
/// </remarks>
public static IEnumerable<IReadOnlyList<TSource>> Split<TSource>(
this IEnumerable<TSource> source,
TSource separator,
IEqualityComparer<TSource>? comparer,
int count
)
{
return Split(source, separator, comparer, count, Identity);
}
/// <summary>
/// Splits the source sequence by a separator and then transforms the splits into results. A parameter specifies
/// how the separator is compared for equality.
/// </summary>
/// <typeparam name="TSource">
/// Type of element in the source sequence.
/// </typeparam>
/// <typeparam name="TResult">
/// Type of the result sequence elements.
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="separator">
/// Separator element.
/// </param>
/// <param name="comparer">
/// Comparer used to determine separator element equality.
/// </param>
/// <param name="resultSelector">
/// Function used to project splits of source elements into elements of the resulting sequence.
/// </param>
/// <returns>
/// A sequence of values typed as <typeparamref name="TResult"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> or <paramref name="resultSelector"/> is <see langword="null"/>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution and streams the groupings. The grouping elements,
/// however, are buffered. Each grouping is therefore yielded as soon as it is complete and before the next
/// grouping occurs.
/// </para>
/// </remarks>
public static IEnumerable<TResult> Split<TSource, TResult>(
this IEnumerable<TSource> source,
TSource separator, IEqualityComparer<TSource> comparer,
Func<IReadOnlyList<TSource>, TResult> resultSelector
)
{
return Split(source, separator, comparer, count: int.MaxValue, resultSelector);
}
/// <summary>
/// Splits the source sequence by a separator, given a maximum count of splits, and then transforms the splits
/// into results. A parameter specifies how the separator is compared for equality.
/// </summary>
/// <typeparam name="TSource">
/// Type of element in the source sequence.
/// </typeparam>
/// <typeparam name="TResult">
/// Type of the result sequence elements.
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="separator">
/// Separator element.
/// </param>
/// <param name="comparer">
/// Comparer used to determine separator element equality.
/// </param>
/// <param name="count">
/// Maximum number of splits.
/// </param>
/// <param name="resultSelector">
/// Function used to project splits of source elements into elements of the resulting sequence.
/// </param>
/// <returns>
/// A sequence of values typed as <typeparamref name="TResult"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> or <paramref name="resultSelector"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="count"/> is less than <c>1</c>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution and streams the groupings. The grouping elements,
/// however, are buffered. Each grouping is therefore yielded as soon as it is complete and before the next
/// grouping occurs.
/// </para>
/// </remarks>
public static IEnumerable<TResult> Split<TSource, TResult>(
this IEnumerable<TSource> source,
TSource separator, IEqualityComparer<TSource>? comparer, int count,
Func<IReadOnlyList<TSource>, TResult> resultSelector
)
{
ArgumentNullException.ThrowIfNull(source);
ArgumentOutOfRangeException.ThrowIfNegativeOrZero(count);
ArgumentNullException.ThrowIfNull(resultSelector);
comparer ??= EqualityComparer<TSource>.Default;
return Split(source, item => comparer.Equals(item, separator), count, resultSelector);
}
/// <summary>
/// Splits the source sequence by separator elements identified by a function.
/// </summary>
/// <typeparam name="TSource">
/// Type of element in the source sequence.
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="separatorFunc">
/// Predicate function used to determine the splitter elements in the source sequence.
/// </param>
/// <returns>
/// A sequence of splits of elements.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> or <paramref name="separatorFunc"/> is <see langword="null"/>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution and streams the groupings. The grouping elements,
/// however, are buffered. Each grouping is therefore yielded as soon as it is complete and before the next
/// grouping occurs.
/// </para>
/// </remarks>
public static IEnumerable<IReadOnlyList<TSource>> Split<TSource>(
this IEnumerable<TSource> source,
Func<TSource, bool> separatorFunc
)
{
return Split(source, separatorFunc, count: int.MaxValue);
}
/// <summary>
/// Splits the source sequence by separator elements identified by a function, given a maximum count of splits.
/// </summary>
/// <typeparam name="TSource">
/// Type of element in the source sequence.
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="separatorFunc">
/// Predicate function used to determine the splitter elements in the source sequence.
/// </param>
/// <param name="count">
/// Maximum number of splits.
/// </param>
/// <returns>
/// A sequence of splits of elements.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/> or <paramref name="separatorFunc"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="count"/> is less than <c>1</c>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution and streams the groupings. The grouping elements,
/// however, are buffered. Each grouping is therefore yielded as soon as it is complete and before the next
/// grouping occurs.
/// </para>
/// </remarks>
public static IEnumerable<IReadOnlyList<TSource>> Split<TSource>(
this IEnumerable<TSource> source,
Func<TSource, bool> separatorFunc,
int count
)
{
return Split(source, separatorFunc, count, Identity);
}
/// <summary>
/// Splits the source sequence by separator elements identified by a function and then transforms the splits
/// into results.
/// </summary>
/// <typeparam name="TSource">
/// Type of element in the source sequence.
/// </typeparam>
/// <typeparam name="TResult">
/// Type of the result sequence elements.
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="separatorFunc">
/// Predicate function used to determine the splitter elements in the source sequence.
/// </param>
/// <param name="resultSelector">
/// Function used to project splits of source elements into elements of the resulting sequence.
/// </param>
/// <returns>
/// A sequence of values typed as <typeparamref name="TResult"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/>, <paramref name="separatorFunc"/>, or <paramref name="resultSelector"/> is <see
/// langword="null"/>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution and streams the groupings. The grouping elements,
/// however, are buffered. Each grouping is therefore yielded as soon as it is complete and before the next
/// grouping occurs.
/// </para>
/// </remarks>
public static IEnumerable<TResult> Split<TSource, TResult>(
this IEnumerable<TSource> source,
Func<TSource, bool> separatorFunc,
Func<IReadOnlyList<TSource>, TResult> resultSelector
)
{
return Split(source, separatorFunc, count: int.MaxValue, resultSelector);
}
/// <summary>
/// Splits the source sequence by separator elements identified by a function, given a maximum count of splits,
/// and then transforms the splits into results.
/// </summary>
/// <typeparam name="TSource">
/// Type of element in the source sequence.
/// </typeparam>
/// <typeparam name="TResult">
/// Type of the result sequence elements.
/// </typeparam>
/// <param name="source">
/// The source sequence.
/// </param>
/// <param name="separatorFunc">
/// Predicate function used to determine the splitter elements in the source sequence.
/// </param>
/// <param name="count">
/// Maximum number of splits.
/// </param>
/// <param name="resultSelector">
/// Function used to project a split group of source elements into an element of the resulting sequence.
/// </param>
/// <returns>
/// A sequence of values typed as <typeparamref name="TResult"/>.
/// </returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="source"/>, <paramref name="separatorFunc"/>, or <paramref name="resultSelector"/> is <see
/// langword="null"/>.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="count"/> is less than <c>1</c>.
/// </exception>
/// <remarks>
/// <para>
/// This method is implemented by using deferred execution and streams the groupings. The grouping elements,
/// however, are buffered. Each grouping is therefore yielded as soon as it is complete and before the next
/// grouping occurs.
/// </para>
/// </remarks>
public static IEnumerable<TResult> Split<TSource, TResult>(
this IEnumerable<TSource> source,
Func<TSource, bool> separatorFunc,
int count,
Func<IReadOnlyList<TSource>, TResult> resultSelector
)
{
ArgumentNullException.ThrowIfNull(source);
ArgumentNullException.ThrowIfNull(separatorFunc);
ArgumentOutOfRangeException.ThrowIfNegativeOrZero(count);
ArgumentNullException.ThrowIfNull(resultSelector);
return Core(source, separatorFunc, count, resultSelector);
static IEnumerable<TResult> Core(
IEnumerable<TSource> source,
Func<TSource, bool> separatorFunc,
int count,
Func<IReadOnlyList<TSource>, TResult> resultSelector
)
{
var items = new List<TSource>();
foreach (var item in source)
{
if (count > 0 && separatorFunc(item))
{
yield return resultSelector(items);
count--;
items = [];
}
else
{
items.Add(item);
}
}
if (items.Count > 0)
yield return resultSelector(items);
}
}
}