Headless Workspace

[Julian]

Hey guys,

I want to test if a blockly-code-solution ist coded correctly. To reach that i want to rerun the solution code in a headless workspace with different values and the Main-Workspace should not change. 

I read the api already but it's not helping too much. So this is what i want to do:

1: parse the solution in xml and change the values [works]

2: return the changed xml-code to blockly-xml-dom [works]

3: rerun the code in javascript due to a headless workspace [doesn't work]

I wish it could work like that:

var changedXml = (new XMLSerializer()).serializeToString(xmlDoc);

  var xml = Blockly.Xml.textToDom(changedXml);

  var headless = new Blockly.Workspace();

  Blockly.Xml.domToWorkspace(headless, xml);

  var changedCode = Blockly.JavaScript.workspaceToCode(headless);

  headless.dispose();

  try {

  eval(changedCode);

} catch (e) {

alert(e);

}

 Thanks for your support.

[Victor Ng]

This looks correct.

Could you post the JavaScript code that is being generated? What is the error that is printed from your code?

[Julian]

Thanks for your fast reply Victor. 

At the moment the posted code is not creating any javascript because i get this error-line here:

Uncaught TypeError: Cannot read property '1' of undefined

    at new Blockly.Connection (blockly_blockly.js?hash=b464fb2…:909)  .... 

at Object.Blockly.Xml.domToBlockHeadless_

This error happens exactly with this line of code:

Blockly.Xml.domToWorkspace(headless, xml);

(Swapping the parameters doesn't help as well)

I think the problem here is that it's not 100 % clear how to create a headless workspace correctly.

[Victor Ng]

If you could post a sample project that demonstrates the problem, it would be much easier to help debug.

Some places to start looking:

- check that the XML being passed in is correctly formed.

- check that the definitions for the blocks in your workspace have been loaded in JS prior to calling the code snippet.

I'd also try hardcoding a very basic workspace XML to see if that runs through that code snippet. Then, assuming that works successfully, slowly add block XML to eventually match the XML that's causing problems.

[Rachel Fenichel]

Hi Julian,

There's a sample that uses a headless workspace.  Here's the code.

Cheers,

Rachel