nimforum mirror - Problems with XML

achesak (orginal) [2013-09-28T06:49:59+02:00] view original

Hello once again!

It's probably a simple question (again), but I've been having some trouble with parsing XML documents. All I need to do is get the text value in a Node, but I can't seem to find a method/property for doing so. The XML DOM should have a property for Nodes called "nodeValue", but Nimrod doesn't seem to have one. The xmltree module has a "innerText()" function, but it works with a PXmlNode instead of a PNode.

The closest I have is this:


    # Create the XML.
    var doc : PDocument = loadXML(response)
    
    # Get the element.
    var node : PNode = getElementsByTagName(doc, "user")[0]
    
    # Get the info.
    var userName : string = innerText(node.firstChild)

...but this causes an error for the above reason. Is there a way to convert between them, or is there a simpler way that I could use?

Any help would be greatly appreciated!

Araq (orginal) [2013-09-28T11:17:34+02:00] view original

Untested:

import xmltree, xmlparser

let doc = loadXml("fromfile.xml")
let elem = doc.findAll("user")[0]
let userName = elem.innerText

I never use xmldom as the DOM is a foolish design.

achesak (orginal) [2013-09-28T17:54:27+02:00] view original

Thanks, but that still doesn't work. loadXML() returns a PDocument, while findAll() requires a PXmlNode. Is there any way to convert between the two, or a way to parse XML from a string and return it as a PXmlNode?

Araq (orginal) [2013-09-28T18:37:34+02:00] view original

xmltree, parsexml and xmlparser all work with each other, xmlparser.loadXml returns a PXmlNode. The other class of XML modules is xmldom and xmldomparser which are more standards compliant but the standard sucks.

achesak (orginal) [2013-09-28T19:53:52+02:00] view original

Ah, that's it. I was using the loadXML() function from the xmldomparser module.

Thanks so much!

achesak (orginal) [2013-10-07T15:05:19+02:00] view original

Having slight problems again, but with a different thing this time.

When trying to parse XML, I'm getting this error message:


Traceback (most recent call last)
noaa.nim(74)             noaa
noaa.nim(36)             getWeather
xmlparser.nim(126)       parseXml
xmlparser.nim(24)        raiseInvalidXml
Error: unhandled exception: unknown_html_doc(2, 55) Error: <some_tag> expected [EInvalidXml]

...which I don't understand, because as far as I can tell this document is perfectly well formed. Even more confusingly, there is no tag in the document called "some_tag". Is this an internal thing that the module uses?

Here's an example of the format of a document that I'm trying to get data out of: http://pastebin.com/NbcBNDwH

Araq (orginal) [2013-10-07T15:29:18+02:00] view original

Looks like it's caused be the leading whitespace before the <?xml .... As workaround try to get rid of it.

achesak (orginal) [2013-10-07T16:05:27+02:00] view original

Sorry, that's just a problem with bad copy and pasting; in the actual xml it starts on the first line, the two blanks aren't there.

dom96 (orginal) [2013-10-07T17:54:34+02:00] view original

Looks like the problem is the second line: <?xml-stylesheet href="latest_ob.xsl" type="text/xsl"?>

Parser bug I guess.

EDIT: Try it now, I fixed it here.

achesak (orginal) [2013-10-07T18:19:38+02:00] view original

Huh, removing that line appears to have worked. Thanks for the help!

EDIT: posted before seeing your edit, I'll check while leaving that line in

EDIT 2: works now, thanks again!

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