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Add GraphTraversal.cs

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ig 2023-09-18 13:06:22 +02:00
parent 13611da7c8
commit 526dd2a47f
1 changed files with 17 additions and 17 deletions
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34
csharp/Lib/Utils/GraphTraversal.cs
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@ -6,7 +6,7 @@ public static class GraphTraversal
{
public static IEnumerable<T> TraverseDepthFirstPreOrder<T>(T root,
Func<T, IEnumerable<T>> getChildren,
IEqualityComparer<T>? comparer = null)
IEqualityComparer<T>? comparer = null)
{
return Traverse(root, TreeTraversal.TraverseDepthFirstPreOrder, getChildren, comparer);
}
@ -14,7 +14,7 @@ IEqualityComparer<T>? comparer = null)
public static IEnumerable<T> TraverseDepthFirstPostOrder<T>(T root,
Func<T, IEnumerable<T>> getChildren,
IEqualityComparer<T>? comparer = null)
IEqualityComparer<T>? comparer = null)
{
return Traverse(root, TreeTraversal.TraverseDepthFirstPostOrder, getChildren, comparer);
}
@ -28,7 +28,7 @@ IEqualityComparer<T>? comparer = null)
public static IEnumerable<T> TraverseDepthFirstPreOrder<T>(IEnumerable<T> sources,
Func<T, IEnumerable<T>> getChildren,
IEqualityComparer<T>? comparer = null)
IEqualityComparer<T>? comparer = null)
{
return Traverse(sources, TreeTraversal.TraverseDepthFirstPreOrder, getChildren, comparer);
}
@ -36,30 +36,30 @@ IEqualityComparer<T>? comparer = null)
public static IEnumerable<T> TraverseDepthFirstPostOrder<T>(IEnumerable<T> sources,
Func<T, IEnumerable<T>> getChildren,
IEqualityComparer<T>? comparer = null)
IEqualityComparer<T>? comparer = null)
{
return Traverse(sources, TreeTraversal.TraverseDepthFirstPostOrder, getChildren, comparer);
}
public static IEnumerable<T> TraverseBreadthFirst<T>(IEnumerable<T> sources,
Func<T, IEnumerable<T>> getChildren,
IEqualityComparer<T>? comparer = null)
IEqualityComparer<T>? comparer = null)
{
return Traverse(sources, TreeTraversal.TraverseBreadthFirst, getChildren, comparer);
}
private static IEnumerable<T> Traverse<T>(T root,
private static IEnumerable<T> Traverse<T>(T root,
Func<T , Func<T, IEnumerable<T>>,IEnumerable<T>> traversor,
Func<T, IEnumerable<T>> getChildren,
IEqualityComparer<T>? comparer = null)
Func<T, IEnumerable<T>> getChildren,
IEqualityComparer<T>? comparer = null)
{
var getUniqueChildren = GetUniqueChildren(getChildren, root, comparer);
return traversor(root, getUniqueChildren);
}
[SuppressMessage("ReSharper", "PossibleMultipleEnumeration")]
private static IEnumerable<T> Traverse<T>(IEnumerable<T> sources,
private static IEnumerable<T> Traverse<T>(IEnumerable<T> sources,
Func<T , Func<T, IEnumerable<T>>,IEnumerable<T>> traversor,
Func<T, IEnumerable<T>> getChildren,
IEqualityComparer<T>? comparer = null)
@ -97,20 +97,20 @@ IEqualityComparer<T>? comparer = null)
select e;
}
private static Func<T, IEnumerable<T>> GetUniqueChildren<T>(Func<T, IEnumerable<T>> getChildren,
T root,
IEqualityComparer<T>? comparer)
private static Func<T, IEnumerable<T>> GetUniqueChildren<T>(Func<T, IEnumerable<T>> getChildren,
T root,
IEqualityComparer<T>? comparer)
{
return GetUniqueChildren(getChildren, root.AsSingleEnumerable(), comparer);
}
private static Func<T, IEnumerable<T>> GetUniqueChildren<T>(Func<T, IEnumerable<T>> getChildren,
IEnumerable<T> sources,
IEqualityComparer<T>? comparer)
private static Func<T, IEnumerable<T>> GetUniqueChildren<T>(Func<T, IEnumerable<T>> getChildren,
IEnumerable<T> sources,
IEqualityComparer<T>? comparer)
{
var set = new HashSet<T>(sources, comparer ?? EqualityComparer<T>.Default);
return n => getChildren(n).Where(set.Add);
}
}
}