[Tree] Add pre-order and level-order traversals #2498

Jean-Beru · 2022-07-26T16:44:37Z

In order to get the next node when traversing a tree, this PRs add new methods NestedTreeRepository::getNextNode and NestedTreeRepository::getNextNodes. They take some arguments :

$root is the top node and is used to limit result to this (sub-)tree
$node is the current node (or null for the first call)
$limit (only for getNextNodes) can limit nodes count to return
$traversalStrategy accepts self::TRAVERSAL_PRE_ORDER (default) or self::TRAVERSAL_LEVEL_ORDER and is used to determine which algorithm use (see https://www.geeksforgeeks.org/tree-traversals-inorder-preorder-and-postorder).

These methods can be used, for example, to read a book page after page:

The History of Middle-earth
- The Book of Lost Tales 1
  - Chapter 1
    - Page 1
    - Page 2
    - Page 3
    - ...
  - Chapter 2
    - Page 1
    - Page 2
    - Page 3
    - ...
- The Book of Lost Tales 2
- ...

codecov-commenter · 2022-07-27T08:24:09Z

Codecov Report

❌ Patch coverage is 95.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.30%. Comparing base (f21d888) to head (0037f83).
⚠️ Report is 183 commits behind head on main.

Files with missing lines	Patch %	Lines
...rc/Tree/Entity/Repository/NestedTreeRepository.php	95.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2498      +/-   ##
==========================================
+ Coverage   79.22%   79.30%   +0.07%     
==========================================
  Files         161      161              
  Lines        8415     8455      +40     
==========================================
+ Hits         6667     6705      +38     
- Misses       1748     1750       +2

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morban · 2023-04-25T13:30:58Z

It will be nice if this PR was successful and merge. Thank you.

src/Tree/Entity/Repository/NestedTreeRepository.php

Co-authored-by: Javier Spagnoletti <[email protected]>

src/Tree/Entity/Repository/NestedTreeRepository.php

tests/Gedmo/Tree/NestedTreeTraversalTest.php

Co-authored-by: Javier Spagnoletti <[email protected]>

tests/Gedmo/Tree/NestedTreeTraversalTest.php

Co-authored-by: Javier Spagnoletti <[email protected]>

franmomu

I guess we can add object type to parameters

franmomu · 2023-08-06T13:06:41Z

CHANGELOG.md


 ### Added
 - Tree: Add `Nested::ALLOWED_NODE_POSITIONS` constant in order to expose the available node positions
+- Tree: Add pre-order and level-order traversals (#2498). Add `getNextNode()` and `getNextNodes()` methods to traverse the tree


This should be moved to the ## [Unreleased] section

franmomu · 2023-08-06T13:14:37Z

src/Tree/Entity/Repository/NestedTreeRepository.php

+     *
+     * @throws InvalidArgumentException if input is invalid
+     */
+    public function getNextNodesQueryBuilder($root, $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): QueryBuilder


Suggested change

public function getNextNodesQueryBuilder($root, $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): QueryBuilder

public function getNextNodesQueryBuilder(object $root, ?object $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): QueryBuilder

Should we make this method private?

franmomu · 2023-08-06T13:17:03Z

src/Tree/Entity/Repository/NestedTreeRepository.php

+     * @param int|null          $limit             Maximum nodes to return. If null, all nodes will be returned
+     * @param self::TRAVERSAL_* $traversalStrategy Strategy to use to traverse tree
+     */
+    public function getNextNodesQuery($root, $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): Query


Suggested change

public function getNextNodesQuery($root, $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): Query

public function getNextNodesQuery(object $root, ?object $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): Query

franmomu · 2023-08-06T13:17:43Z

src/Tree/Entity/Repository/NestedTreeRepository.php

+     * @param object|null       $node              Current node. If null, first node will be returned
+     * @param self::TRAVERSAL_* $traversalStrategy Strategy to use to traverse tree
+     */
+    public function getNextNode($root, $node = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): ?object


Suggested change

public function getNextNode($root, $node = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): ?object

public function getNextNode(object $root, ?object $node = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): ?object

franmomu · 2023-08-06T13:17:57Z

src/Tree/Entity/Repository/NestedTreeRepository.php

+     *
+     * @return array<object>
+     */
+    public function getNextNodes($root, $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): array


Suggested change

public function getNextNodes($root, $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): array

public function getNextNodes(object $root, ?object $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): array

Jean-Beru · 2023-08-07T08:55:16Z

@franmomu I agree to add the object type to arguments and make some functions private. Since this logic could be applied to other NestedTreeRepository functions (get*QueryBuilder and get*Query), should we:

keep as it is to have the same approach
make only new typehinted and private
make all typehinted and private => will cause a BC break
?

IMO, the second one it the best answer since we improve code without any BC break. Before doing any commit, is it OK for you @phansys ?

phansys · 2023-08-12T19:31:52Z

src/Tree/Entity/Repository/NestedTreeRepository.php

+            }
+        } elseif (self::TRAVERSAL_LEVEL_ORDER === $traversalStrategy) {
+            if (!isset($config['level'])) {
+                throw new \InvalidArgumentException('TreeLevel must be set to use level order traversal.');


Why \InvalidArgumentException? $config['level'] isn't provided as an argument in this method.

phansys · 2023-08-12T19:36:17Z

IMO, the second one it the best answer since we improve code without any BC break. Before doing any commit, is it OK for you @phansys ?

LGTM.

github-actions · 2024-02-14T09:04:04Z

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

Jean-Beru · 2024-05-24T13:08:48Z

github-actions, you can keep this PR opened. I'll fix conflicts soon.

github-actions · 2025-02-14T09:05:08Z

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

github-actions · 2025-08-13T10:05:51Z

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

Jean-Beru force-pushed the feat/get-next-node branch from 2fad25b to 442d99b Compare July 27, 2022 08:22

Jean-Beru force-pushed the feat/get-next-node branch 2 times, most recently from 3e19794 to c47fa1b Compare July 27, 2022 08:26

phansys added Tree Needs Changelog note New Feature labels Jul 28, 2022

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Jean-Beru and others added 10 commits July 28, 2023 10:32

[Tree] Add pre-order and level-order traversals

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update CHANGELOG.md

490fff3

Update src/Tree/Entity/Repository/NestedTreeRepository.php

3f5ad50

Co-authored-by: Javier Spagnoletti <[email protected]>

Update src/Tree/Entity/Repository/NestedTreeRepository.php

90431f3

Co-authored-by: Javier Spagnoletti <[email protected]>

Update src/Tree/Entity/Repository/NestedTreeRepository.php

7f0889b

Co-authored-by: Javier Spagnoletti <[email protected]>

Update src/Tree/Entity/Repository/NestedTreeRepository.php

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Co-authored-by: Javier Spagnoletti <[email protected]>

Update src/Tree/Entity/Repository/NestedTreeRepository.php

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Co-authored-by: Javier Spagnoletti <[email protected]>

Update src/Tree/Entity/Repository/NestedTreeRepository.php

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Co-authored-by: Javier Spagnoletti <[email protected]>

Update src/Tree/Entity/Repository/NestedTreeRepository.php

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Jean-Beru force-pushed the feat/get-next-node branch from 42c0094 to 079cec2 Compare July 28, 2023 08:35

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Jean-Beru and others added 4 commits July 31, 2023 16:32

Update src/Tree/Entity/Repository/NestedTreeRepository.php

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Update src/Tree/Entity/Repository/NestedTreeRepository.php

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fix: review

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Update tests/Gedmo/Tree/NestedTreeTraversalTest.php

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	public function getNextNodesQueryBuilder($root, $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): QueryBuilder
	public function getNextNodesQueryBuilder(object $root, ?object $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): QueryBuilder

	public function getNextNodesQuery($root, $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): Query
	public function getNextNodesQuery(object $root, ?object $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): Query

	public function getNextNode($root, $node = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): ?object
	public function getNextNode(object $root, ?object $node = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): ?object

	public function getNextNodes($root, $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): array
	public function getNextNodes(object $root, ?object $node = null, ?int $limit = null, string $traversalStrategy = self::TRAVERSAL_PRE_ORDER): array

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[Tree] Add pre-order and level-order traversals #2498

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[Tree] Add pre-order and level-order traversals #2498

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