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ulist_iter_test.go
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ulist_iter_test.go
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package ulist
import (
"testing"
"unsafe"
)
func TestUListIter(t *testing.T) {
entriesPerBlock := int(64 / unsafe.Sizeof(int(1)))
ul := New[int](entriesPerBlock)
// Constructor sanity test.
iter := ul.Begin()
checkEq(t, iter.node, nil)
checkEq(t, iter.index, 0)
checkEq(t, iter.IsValid(), false)
iter = ul.End()
checkEq(t, iter.node, nil)
checkEq(t, iter.index, 0)
checkEq(t, iter.IsValid(), false)
ul.PushBack(1)
ul.PushBack(2)
ul.PushBack(3)
// Sanity test iterator of a non empty ulist.
iter = ul.Begin()
checkEq(t, iter.node, ul.ll.Front)
checkEq(t, iter.index, 0)
checkEq(t, iter.IsValid(), true)
iter = ul.End()
checkEq(t, iter.node, ul.ll.Back)
checkEq(t, iter.index, 2)
checkEq(t, iter.IsValid(), true)
}
func TestUListIterIteration(t *testing.T) {
entriesPerBlock := int(64 / unsafe.Sizeof(int(1)))
ul := New[int](entriesPerBlock)
for i := 0; i < 10; i++ {
ul.PushBack(i)
}
// Iterate begin to end.
ret := make([]int, 0)
for iter := ul.Begin(); iter.IsValid(); iter.Next() {
v := iter.Get()
ret = append(ret, v)
}
checkEq(t, ret, []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9})
// Iterate end to begin.
ret = make([]int, 0)
for iter := ul.End(); iter.IsValid(); iter.Prev() {
v := iter.Get()
ret = append(ret, v)
}
checkEq(t, ret, []int{9, 8, 7, 6, 5, 4, 3, 2, 1, 0})
// Bi-directional iteration.
iter := ul.Begin()
checkEq(t, iter.IsValid(), true)
checkEq(t, iter.Get(), 0)
checkEq(t, iter.Next(), true)
checkEq(t, iter.Get(), 1)
checkEq(t, iter.Next(), true)
checkEq(t, iter.Get(), 2)
checkEq(t, iter.Prev(), true)
checkEq(t, iter.Get(), 1)
checkEq(t, iter.Prev(), true)
checkEq(t, iter.Get(), 0)
checkEq(t, iter.Prev(), false)
// Seek to the end of the block.
for i := 0; i < entriesPerBlock; i++ {
checkEq(t, iter.Next(), true)
}
checkEq(t, iter.Get(), 7)
// Straddle back and forth across block boundaries.
checkEq(t, iter.Next(), true)
checkEq(t, iter.Get(), 8)
checkEq(t, iter.Prev(), true)
checkEq(t, iter.Get(), 7)
validateBlockCapacities(t, ul)
}
func TestUListIterRecovery(t *testing.T) {
entriesPerBlock := int(64 / unsafe.Sizeof(int(1)))
ul := New[int](entriesPerBlock)
for i := 0; i < 5; i++ {
ul.PushBack(i)
}
// No matter how far we iterate forward, we should be able to jump back
// to the end element by calling Prev().
iter := ul.Begin()
for i := 0; i < ul.Size()*2; i++ {
iter.Next()
}
checkEq(t, iter.IsValid(), false)
checkEq(t, iter.Prev(), true)
checkEq(t, iter.Get(), 4)
// Test the same when iterating in reverse.
iter = ul.End()
for i := 0; i < ul.Size()*2; i++ {
iter.Prev()
}
checkEq(t, iter.IsValid(), false)
checkEq(t, iter.Next(), true)
checkEq(t, iter.Get(), 0)
}
func TestUListIterDeletes(t *testing.T) {
entriesPerBlock := int(64 / unsafe.Sizeof(int(1)))
ul := New[int](entriesPerBlock)
for i := 0; i < 10; i++ {
ul.PushBack(i)
}
// ul: [0,1,...,7] -> [8,9]
expectedNumEntries := 10
expectedNumBlocks := 2
checkEq(t, ul.Size(), expectedNumEntries)
checkEq(t, getNumUListEntries(ul), expectedNumEntries)
checkEq(t, getNumUListBlocks(ul), expectedNumBlocks)
validateBlockCapacities(t, ul)
// Deleting the last element should invalidate the iterator.
// ul: [0,1,...,7] -> [8,_]
// ^
iter := ul.End()
checkEq(t, iter.Get(), 9)
ul.Remove(iter)
checkEq(t, iter.IsValid(), false)
expectedNumEntries--
validateBlockCapacities(t, ul)
// Deleting the last element should get rid of the block.
// ul: [0,1,...,7]
checkEq(t, iter.Prev(), true)
checkEq(t, iter.Get(), 8)
ul.Remove(iter)
checkEq(t, iter.IsValid(), false)
checkEq(t, iter.Prev(), true)
checkEq(t, iter.Get(), 7)
expectedNumEntries--
expectedNumBlocks--
checkEq(t, ul.Size(), expectedNumEntries)
checkEq(t, getNumUListEntries(ul), expectedNumEntries)
checkEq(t, getNumUListBlocks(ul), expectedNumBlocks)
validateBlockCapacities(t, ul)
// Empty the ulist from begin.
for iter := ul.Begin(); iter.IsValid(); ul.Remove(iter) {
}
expectedNumEntries = 0
expectedNumBlocks = 0
checkEq(t, ul.Size(), expectedNumEntries)
checkEq(t, getNumUListEntries(ul), expectedNumEntries)
checkEq(t, getNumUListBlocks(ul), expectedNumBlocks)
validateBlockCapacities(t, ul)
}
func TestUListIterAdd(t *testing.T) {
entriesPerBlock := int(64 / unsafe.Sizeof(int(1)))
ul := New[int](entriesPerBlock)
for i := 0; i < entriesPerBlock-1; i++ {
ul.PushBack(i)
}
// ul: [0,1,...,6]
iter := ul.End()
checkEq(t, iter.Get(), 6)
expectedNumEntries := 7
expectedNumBlocks := 1
checkEq(t, ul.Size(), expectedNumEntries)
checkEq(t, getNumUListEntries(ul), expectedNumEntries)
checkEq(t, getNumUListBlocks(ul), expectedNumBlocks)
checkEq(t, getSlice(ul), []int{0, 1, 2, 3, 4, 5, 6})
// Add entries.
ul.AddAfter(iter, 7)
checkEq(t, iter.Get(), 7)
ul.AddAfter(iter, 8)
checkEq(t, iter.Get(), 8)
// ul: [0,1,...,6,7] -> [8]
expectedNumEntries = 9
expectedNumBlocks = 2
checkEq(t, ul.Size(), expectedNumEntries)
checkEq(t, getNumUListEntries(ul), expectedNumEntries)
checkEq(t, getNumUListBlocks(ul), expectedNumBlocks)
checkEq(t, getSlice(ul), []int{0, 1, 2, 3, 4, 5, 6, 7, 8})
// Add to an already full block.
// ul: [0,-1,1,...,6] -> [7,8]
iter = ul.Begin()
ul.AddAfter(iter, -1)
checkEq(t, iter.Get(), -1)
expectedNumEntries++
checkEq(t, ul.Size(), expectedNumEntries)
checkEq(t, getNumUListEntries(ul), expectedNumEntries)
checkEq(t, getNumUListBlocks(ul), expectedNumBlocks)
checkEq(t, getSlice(ul), []int{0, -1, 1, 2, 3, 4, 5, 6, 7, 8})
// Add to an already full block, such that the new element overflows.
// ul: [0,-1,1,...,6] -> [-6,7,8]
iter = ul.End()
iter.Prev()
iter.Prev()
checkEq(t, iter.Get(), 6)
ul.AddAfter(iter, -6)
checkEq(t, iter.Get(), -6)
expectedNumEntries++
checkEq(t, ul.Size(), expectedNumEntries)
checkEq(t, getNumUListEntries(ul), expectedNumEntries)
checkEq(t, getNumUListBlocks(ul), expectedNumBlocks)
checkEq(t, getSlice(ul), []int{0, -1, 1, 2, 3, 4, 5, 6, -6, 7, 8})
validateBlockCapacities(t, ul)
// Test AddBefore on the first element.
iter = ul.Begin()
ul.AddBefore(iter, 100)
checkEq(t, iter.Get(), 100)
expectedNumEntries++
expectedNumBlocks++
// Test AddBefore in the middle.
checkEq(t, iter.Next(), true)
checkEq(t, iter.Next(), true)
checkEq(t, iter.Next(), true)
checkEq(t, iter.Get(), 1)
ul.AddBefore(iter, 111)
checkEq(t, iter.Get(), 111)
expectedNumEntries++
// ul: [100] -> [0,-1,111,1,...,5] -> [6,-6,7,8]
checkEq(t, ul.Size(), expectedNumEntries)
checkEq(t, getNumUListEntries(ul), expectedNumEntries)
checkEq(t, getNumUListBlocks(ul), expectedNumBlocks)
checkEq(t, getSlice(ul), []int{100, 0, -1, 111, 1, 2, 3, 4, 5, 6, -6, 7, 8})
validateBlockCapacities(t, ul)
}