Re: [Vala] [Genie] Using MarkupParser

[Patrick Castle <lemeia bigpond com>]

Nicolas wrote:
> Hi Patrick,
>
> You can use the example from Caleb72:
>
> [indent=3]
> uses
>   Xml
>
> class JWMReader : Object
>   path : string
>
>   init
>      Parser.init()
>
>   final
>      Parser.cleanup()
>
>   def run()
>      var doc = Parser.parse_file(path)
>      var node = doc->get_root_element()
>      parse_node(node)
>
>   def set_source(pathname : string)
>      path = pathname
>
>   def private parse_node(node : Xml.Node*)
>      if node is null
>         return
>      case node->type
>         when ElementType.ELEMENT_NODE
>            print "NODE: %s", node->name
>            if node->properties is not null
>               get_attributes(node, node->properties)
>            if node->children is null
>               node = node->next
>            else
>               node = node->children
>         when ElementType.TEXT_NODE
>            if not (node->content.strip() is "")
>               print "TEXT: %s", node->content.strip()
>            if node->next is null
>               node = node->parent->next
>            else
>               node = node->next
>         when ElementType.COMMENT_NODE
>            node = node->next
>         default
>            print("DO NOT RECOGNISE NODE!")
>            return        parse_node(node)
>
>   def private get_attributes(node : Xml.Node*, properties : Xml.Attr*)
>      if properties is null
>         return
>      print "ATTR: %s VALUE: %s", properties->name, 
> node->get_prop(properties->name)
>      properties = properties->next
>      get_attributes(node, properties)
>
> init
>   var reader = new JWMReader()
>   reader.set_source("/root/.jwmrc-tray")
>   reader.run()
>
> See you,
> Nicolas.
Thanks Nicholas - actually I am Caleb72.

That small piece of code was the result of about a day's work trying to 
understand that library - looking both at the Vala documentation and the 
original C library reference material. Then it was down to trial and error.

By the way - do you think the concerns I raised on the Puppy forum are 
correct regarding this code? I'm not actually doing anything to cleanup 
the Xml.Doc*, Xml.Node* and Xml.Attr* pointers I create and my reading 
of Parser.cleanup() was that everything is not necessarily destroyed. 
Genie has delete which I could use - not sure if I should be using 
something defined in the libxml library though.

My understanding of Genie thus far is that when you specifically define 
pointers as I have in this case, you take the responsibility for 
management of the memory, the reference counter isn't applicable.

Regards
Patrick