SU Ruby + XML

thomthom

search in the gems directory for nokogiri (the lib and ext directory). you can make a test outside Sketchup and use ProcMon to look what files it loads and copy those in SU Plugins subdir

I copied nokogiri.rb and nokogiri folder from the lib folder to the SU Plugin folder.

When I start SU I get an error message:


Error Loading File nokogiri.rb
126; The specified module could not be found.   - C;/Program Files (x86)/Google/Google SketchUp 7/Plugins/nokogiri/1.8/nokogiri.so

Which is strange - because the file is there; And a Console test:


File.exist?('C;/Program Files (x86)/Google/Google SketchUp 7/Plugins/nokogiri/1.8/nokogiri.so')
true

So why it claims it's not there - I have no idea.

thomthom

@toxicvoxel said:

Having explored a few options in the past I settled on writing a .DLL in .NET that uses the powerful XML query functionality of LINQ to to do the data crunching. By doing this you could call a simple function through COM to retrieve/update specific node and attribute values from SU Ruby. If you do not have knowledge of any of the main .NET languages you could possibly explore using IronRuby for this purpose.

I've briefly sniffed at C# previously - but I have no idea on how to do what you suggest.

I find it very odd that there isn't a built in XML support in Ruby considering how common XML is.

...maybe I can send the raw XML content to a Webdialog and have a JS parse it - feeding it back to Ruby. Not ideal - but I can't get any other solutions to work.

Jim

It's probably just a matter of getting the paths and require's right. Sometimes when require'ing a .so you might need to respect it's capitalization.

requires dezip.so'

require 'Dezip'

Append your $LOAD_PATH to include the library folder:

On windows (in SetchUp):

$LOAD_PATH.concat eval(c:/ruby/bin/ruby.exe -e "p $:" )

This appends the installed Ruby $LOAD_PATH to SketchUp. (Not well tested by me)

thomthom

I'd like to make the lib work by not having full Ruby installed. Want to ship it as a normal SU plugin.

toxicvoxel

In basic terms this article may be helpful to explain the principle:
http://stackoverflow.com/questions/265879/can-ruby-import-a-net-dll

If you use IronRuby you may be able to write the XML parser .NET class by leveraging your curent ruby skills.
(You will need to do some homework to confirm that you could make the IronRuby .NET class com-visible though.)
Alternatively if you know java you could use J#.NET.

tbd

I will try to look tomorrow when I get on my Windows machine and make a SU friendly package of a XML parser.

It all depends on what XML files you need to parse - if they are static, then you can write a specific XML parser yourself and save the troubles. I wouldn't use XML for anything, hate that format

thomthom

There are several different uses for XML I'd like to use. I like the format, maybe from working with websites...

thomthom

@unknownuser said:

I will try to look tomorrow when I get on my Windows machine and make a SU friendly package of a XML parser.

It all depends on what XML files you need to parse - if they are static, then you can write a specific XML parser yourself and save the troubles. I wouldn't use XML for anything, hate that format

hmm.. These XMl packages - are they PC only?

The nokogiri package has different packages for different platform. That could be a problem. I was hoping to find a cross platform solution. If REXML is cross platform I don't mind it's not too fast. But what troubles me with that is it's conflict with the Set class.

tbd

@thomthom said:

These XML packages - are they PC only?

almost everything that needs speed in Ruby is implemented as an extension, so it is platform dependent. some gems are precompiled (e.g. for Windows), others are in source form and compiled on user machine to gather additional speed on optimizations (e.g. Mac)

http://github.com/jnunemaker/happymapper sounds interesting but again, has a lot of requirements

thomthom

Seeing how getting an XML parser working I think I will go for a custom format and make a simple parser that creates nested Hashes. In fact, I have to make my own Hash object as I want to traverse the Hash in the order the items where inserted.

But I'd still like to be able to read XML data from SU ruby. There's some other projects I'd like to use it which involves reading existing XML based files.

Pout

and? did you manage to get something working that could parse xml?

thomthom

No - I've still not found a good solution.

AdamB

Thomthom, what do you actually want?

If you don't need the full DOM, then these big (often slow) XML parsers may be a hammer to crack a nut.

If you're just looking to use XML as a simple text mark-up of parameters etc, then writing something in Ruby that yanks out tag-value pairs would be trivial.

thomthom

You got a point there. It's mostly simple XML files with tags and attributes.
Could make a simple reader and writer. Make a custom class that holds values and attributes, read the XML file as a nested object.
K.I.S.S.

todd burch

I write an xml file in ruby, pass it to my webdialog, and use the browser to parse the xml and generate my html table dynamically.

Works awesome.

MartinRinehart

@unknownuser said:

I write an xml file in ruby, pass it to my webdialog, and use the browser to parse the xml and generate my html table dynamically.

Works awesome.

Todd, you're working too hard. Replace the XML with JSON (no harder, may be easier in Ruby), pass it to your WebDialog and "parse the XML" is just eval( foo = json ). If json is a valid JavaScript object, even a complex one nesting arrays and other objects as properties (that in turn nest other ...), you're done.

todd burch

No, I'm working smart. With what I am doing with XML, I can allow user customization of the entire dialog for table layout, ordering, field values, content, etc., and never have to touch how my ruby script generates the data again.

Pout

So you import the xml file into the webdialog and in there you parse it? With a javascript script or something else?
I'm getting lost here.

todd burch

@pout said:

So you import the xml file into the webdialog and in there you parse it? With a javascript script or something else?
I'm getting lost here.

I display a webdialog. In the webdialog, on some user action, (a javascript event), a javascript function calls a Ruby callback, which iterates over the SketchUp model and builds an XML document of it. Then, the callback finished by setting a javascript variable with the xml document. Then, back in javascript, I call the browser to parse the XML document. I then (in javascript) iterate over the parsed document to build my dynamic html <table>.

Todd

MartinRinehart

@unknownuser said:

a Ruby callback, which iterates over the SketchUp model and builds an XML document of it

Why is XML better than JSON?