Transforming an XML element based on its sibling, using scala.xml.transform.RuleTransformer -


given xml: 

<root>  <item>    <discriminator>d1</discriminator>    <target>t1</target>    <subitem>        <incomplete></incomplete>    </subitem>    <subitem>        <incomplete></incomplete>    </subitem>  </item>  <item>     <discriminator>d2</discriminator>    <target>t2</target>    <subitem>        <incomplete></incomplete>    </subitem>  </item> </root>

i need transform such that:
1) each <item>, text of <target> modified based on text in <discriminator>.
2) each <incomplete>, add text content.

based on other posts, far i've come solution 2), using rewriterule , ruletransformer. goes this: 

object completeincomplete extends rewriterule {       override def transform(n: node): seq[node] = n match {         case elem(_, "incomplete", _, _, _*) =>           <incomplete>content</incomplete>         case other => other       }     } object transform extends ruletransformer(completeincomplete) transform(xml)

this seems work fine, don't know:

  • how achieve 1) (modifying element based on sibling)
  • how combine 2 processing steps. is: make sense in case have 2 different rewriterule-s? 2 wasteful? possible/advisable achieve both transformations in single iteration?

for 1), have tried pattern match list of children, this: 

case elem("", "item", _, _, disc@elem("", "discriminator", _, _, _*))      if discriminate(disc) => //...?

or this:

case item@elem("", "item", _, _, _*)      if discriminate(item \ "disc") => //..?

but didn't work out well, because don't know how recreate whole item replacing <target>

i don't know if in case matching against <item> way go. if is, can somehow achieve transformation of <incomplete>children?

what correct approach here?

see if works you:

  override def transform(n: node): seq[node] = n match {      case el @ elem(_, "item", _, _, _*) =>       val children = el.child       val disc = children.find(_.label == "discriminator")       val content = children.collect{         case el @ elem(_, "target", _, _, _*) =>           <target>{el.text + disc.map(_.text).getorelse("")}</target>         case e:elem => e       }       <item>{content}</item>      case el @ elem(_, "incomplete", _, _, _*) =>         <incomplete>some content</incomplete>     case other => other   }

the xml structure immutable, when on particular element, can not access it's parent. because of that, chose approach problem #1 stopping on item instead , replacing child content. hope looking for.


Comments

Post a Comment

Popular posts from this blog

jquery - How can I dynamically add a browser tab? -

since using iframes house external pages are, accounts "not preferred method" , disallowed sites (flickr, one), want dynamically generate browser tabs. e.g., when user submits form, want dynamically generate tab on browser in response submitted. e.g., might want add new tab url like: http://www.bigsurgarrapata.com/contact how in jquery? you want form target attribute action attribute. http://www.w3schools.com/tags/att_form_target.asp browsers have ultimate control on result of target attribute open new tab value of _blank. <form action="contact_submit.php" target="_blank" method="post">
Read more

node.js - Getting the socket id,user id pair of a logged in user(s) -

i have web application done using node js , in it,i have authentication system requires users log in before can access pages. have 2 pages,the homepage , updates page. from read docs,a new socket id issued when user opens tab in browser. me being admin,i know socket id of logged in user , more so,the socket id,logged in user id pair logged in users. what method can use socket id,logged in user id pair make sure broadcast realtime info users online?.
Read more

keyboard - C++ GetAsyncKeyState alternative -

i using windows.h library's getasynckeystate function define key pushed on keyboard . here program returns int value of pushed key example. #include <iostream> #include <windows.h> using namespace std; int main (){ char i; for(i=8;i<190;i++){ if(getasynckeystate(i)== -32767){ cout<<int (i)<<endl; } } return 0; } but trying make opengl simple game , function appeared slow . there function not need cycle 180 times , if statement . thanks you're trying make opengl game, you're going use glfw. if that's case can away using glfwgetkey() such: if (glfwgetkey(glfw_key_up) == glfw_press) {...} if (glfwgetkey(glfw_key_down) == glfw_press) {...} that method nicely explained in tutorial 6 opengl-tutorial.org . should start first tutorial of beginners tutorials , later intermediate tutorials . if you're going make win32 window can listen wm_keydown or wm_keyup messages , virtua
Read more