Express XPath as an expression tree

Posted by 47d_ on Stack Overflow See other posts from Stack Overflow or by 47d_
Published on 2010-05-18T21:18:13Z Indexed on 2010/05/18 21:20 UTC
Read the original article Hit count: 197

Filed under:

xpath

|

expression

|

tree

If I have an XPath query like

NodeA/NodeB[@WIDTH and not(@WIDTH="20")] | NodeC[@WIDTH and not(@WIDTH="20")]/NodeD

Is there any API available to visualize this XPath query as a stack of atomic expressions, something like (following is generic)

Get results of NodeA, call it "first set"
Get results of NodeB from "first set"
Filter where [@WIDTH and not(@WIDTH="20")]
Filter NodeD, call this "node d for B"
Get results of NodeC from "first set"
Filter where [@WIDTH and not(@WIDTH="20")]
Filter NodeD, call this "node d for C"
Combine "node d for B" and "node d for C"

I am trying to see if we can convert the XPath expression into custom expression which is close to english and vice versa.

If no API is available, what would be the best approach? Thanks in advance.

© Stack Overflow or respective owner

Related posts about xpath

xpath query in a servlet gives exception

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a Document object initialized in the init() method of the servlet and use it in the doPost() method to service the requests. selectNodeList() xpath query gives exception when the servlet services many request at same time. The Exception is shown below: Caused by: javax.xml.transform.TransformerException:… >>> More
XPath to find element based on another XPath element

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I have an Java AST and I try to find a variable inside it via XPath. Lets say the variable is called 'foobar' I could use //VariableDeclarator/VariableDeclaratorId[@Image='foobar'] but what if I dont know the text 'foobar', but want to read it from another element //VariableDeclarator/VariableDeclaratorId[@Image=//SynchronizedStatement/Expression/PrimaryExpression/PrimaryPrefix/Name] the… >>> More
Xpath question Xml Xpath

as seen on Stack Overflow - Search for 'Stack Overflow'
I need an xpath expression that would return the value of I need to get the value of this node. the value to extract is my xpath expression is //rates/rate[loantype='30-Year Fixed Rate'] The issue hre is that there are three value each node has a subtype element. Beside fileter for loantype… >>> More
php xpath query on and xpath result

as seen on Stack Overflow - Search for 'Stack Overflow'
Can I use an xpath query on a result already obtained using xpath? >>> More
how to use nokogiri methods .xpath & .at_xpath

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm learning how to use nokogiri and few questions came to me based on the code below require 'rubygems' require 'mechanize' post_agent = WWW::Mechanize.new post_page = post_agent.get('http://www.vbulletin.org/forum/showthread.php?t=230708') puts "\nabsolute path with tbody gives nil" puts post_page… >>> More

Related posts about expression

How to send keypresses from qt application to libvlc

as seen on Stack Overflow - Search for 'Stack Overflow'
I need to send keypresses from my application window to libvlc, how do i do that? I tried using varSetInteger but then i got the following error error: ‘var_SetInteger’ was not declared in this scope so i searched for the file in which var_SetInteger was defined and found that it was defined in… >>> More
Convert Javascript Regular Expression to PHP (PCRE) Expression

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi all, I am up to my neck in regular expressions, and I have this regular expression that works in javascript (and flash) that I just can't get working in PHP Here it is: var number = '(?:-?\\b(?:0|[1-9][0-9]*)(?:\\.[0-9]+)?(?:[eE][+-]?[0-9]+)?\\b)'; var oneChar = '(?:[^\\0-\\x08\\x0a-\\x1f\"\\\\]' … >>> More
Expression Tree Binary Expression for an 'In' operation

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to build an expression tree (still) but getting further! I need to create a BinaryExpression to perform an 'In' comparison between a Member and a collection of items. Hence, the expression should return true if the member is contained within the items. This obviously does not exist: Expression… >>> More
Mixing regular expression and other conditional expression in a bash if statement

as seen on Stack Overflow - Search for 'Stack Overflow'
I can't get around this for quite sometime now. As I read along manuals and tutorials I'm getting more confused. I want an if statement with the following logic: if [ -n $drupal_version ] && [[ "$drupal_version" =~ DRUPAL-[6-9]-[1-9][1-9] ]]; then but I can't get it to work properly. When… >>> More
Matching math expression with regular expression?

as seen on Stack Overflow - Search for 'Stack Overflow'
For example, these are valid math expressions: a * b + c -a * (b / 1.50) (apple + (-0.5)) * (boy - 1) And these are invalid math expressions: --a *+ b @ 1.5.0 // two consecutive signs, two consecutive operators, invalid operator, invalid number -a * b + 1) // unmatched parentheses a) * (b +… >>> More