ancestor

XPath: Recursive Ancestor Search

由 这一生的挚爱 提交于 2019-12-11 06:06:34
问题 With my current node selected I wish to find an element <name> [./name] and return the text content. If an element <name> does not exist in the currently selected node I wish to check the parent element [./parent::name] and so on recursively up to the root, returning the value of the nearest parent where the element exists. Can it be done with XPath? 回答1: (Edit: I misinterpreted the question the first time) I propose to use ancestor-or-self::name[1] This finds all name elements, starting with

combine two PMD checks

由 試著忘記壹切 提交于 2019-12-11 05:43:05
问题 I met a problem while using PMD to check my code errors. I do not know how to satisfy two requirements at the same time. For example, if I want to check a method named ABC not existing in file extends from BCD. I know how to check whether ABC exists or whether it extends from BCD separately using PMD. Like this: //PrimaryExpression/PrimaryPrefix/Name [@Image = "ABC"]; //ExtendsList/ClassOrInterfaceType [@Image != "BCD"]; now, is there anyway that I can check these two together. For example, I

Obtain nodes that don't have specific ancestor xml xpath

由 别说谁变了你拦得住时间么 提交于 2019-12-11 02:09:11
问题 I would like to have xpath, that obtains nodes, that don't have ancestor, which is first descendant of specific node. Let's assume we have xml document like this: <a> <b>This node</b> <c> <a> <b>not this</b> <g> <b>not this</b> </g> </a> <a> <b>This node</b> <c/> </a> </c> </a> <a> <c> <a> <b>not this</b> </a> <a> <b>This node</b> </a> <a> <b>This node</b> </a> <a> <b>This node</b> </a> </c> </a> <d> <b>This node</b> </d> I would like to select all b nodes in document that don't have as their

Nokogiri equivalent of jQuery closest() method for finding first matching ancestor in tree

由 我的梦境 提交于 2019-12-10 04:13:43
问题 jQuery has a lovely if somewhat misnamed method called closest() that walks up the DOM tree looking for a matching element. For example, if I've got this HTML: <table src="foo"> <tr> <td>Yay</td> </tr> </table> Assuming element is set to <td> , then I can figure the value of src like this: element.closest('table')['src'] And that will cleanly return "undefined" if either of the table element or its src attribute are missing. Having gotten used to this in Javascriptland, I'd love to find

Lowest Common Ancestor implementations - what's the difference?

由 别来无恙 提交于 2019-12-08 05:38:45
问题 I've been reading about the Lowest Common Ancestor algorithm on top coder and I can't understand why the RMQ algorithm is involved - the solution listed there is insanely complicated and has the following properties: O(sqrt(n)) time complexity for searches, O(n) precalculation time complexity O(n) space complexity for storing parents of each node O(n) space complexity again, for storing precalculations of each node My solution: given 2 integer values, find the nodes through a simple preorder

check if a component is a child or ancestor of another component ReactJS

由 对着背影说爱祢 提交于 2019-12-08 03:12:12
问题 I am creating a ReactJS Component with an unknown number of children and ancestors, and when a certain event occurs on one of the ancestors I the parent component should know of it. my first approach is to use redux and send the child component with a redux action, and then main parent componetnts will be alerted and will check if the Componetnt sent was one of its ancestors. but, can a parent reactJS component know in someway if another component is one of its ancestors? 回答1: The parent can

check if a component is a child or ancestor of another component ReactJS

由 旧街凉风 提交于 2019-12-07 04:53:28
I am creating a ReactJS Component with an unknown number of children and ancestors, and when a certain event occurs on one of the ancestors I the parent component should know of it. my first approach is to use redux and send the child component with a redux action, and then main parent componetnts will be alerted and will check if the Componetnt sent was one of its ancestors. but, can a parent reactJS component know in someway if another component is one of its ancestors? The parent can define a function in the context, Children can then call this function: Parent: childContextTypes: {

Lowest Common Ancestor implementations - what's the difference?

由 此生再无相见时 提交于 2019-12-06 21:02:26
I've been reading about the Lowest Common Ancestor algorithm on top coder and I can't understand why the RMQ algorithm is involved - the solution listed there is insanely complicated and has the following properties: O(sqrt(n)) time complexity for searches, O(n) precalculation time complexity O(n) space complexity for storing parents of each node O(n) space complexity again, for storing precalculations of each node My solution: given 2 integer values, find the nodes through a simple preorder traversal. Take one of the nodes and go up the tree and store the path into a Set. Take the other node

Nokogiri equivalent of jQuery closest() method for finding first matching ancestor in tree

由 末鹿安然 提交于 2019-12-05 05:34:58
jQuery has a lovely if somewhat misnamed method called closest() that walks up the DOM tree looking for a matching element. For example, if I've got this HTML: <table src="foo"> <tr> <td>Yay</td> </tr> </table> Assuming element is set to <td> , then I can figure the value of src like this: element.closest('table')['src'] And that will cleanly return "undefined" if either of the table element or its src attribute are missing. Having gotten used to this in Javascriptland, I'd love to find something equivalent for Nokogiri in Rubyland, but the closest I've been able to come up with is this

Django migration dependencies reference nonexistent parent node

由 房东的猫 提交于 2019-12-04 05:22:39
问题 I have a problem with django migrations. I get this error: django.db.migrations.exceptions.NodeNotFoundError: Migration user.0050_merge_20170523_1254 dependencies reference nonexistent parent node ('user', '0049_auto_20170519_1934') I fix the errors, deleting some lines but after fix all this errors, I get other: ValueError: Could not find common ancestor of {'0050_merge_20170523_1254', '0007_auto_20170524_1540'} I cant solve that. I can drop database and do makemigrations again... but in
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