How to get all the blocks below a statement block?

[George]

A C-block can get all the blocks inside of it using Blockly.JavaScript.statementToCode(block, 'DO') if the block is initialised with a { "type": "input_statement", "name": "DO" } argument

How to write  a generator for a block that gets all the blocks FOLLOWING this block and then prevent them being manually transpiled by Blockly?

So, a pseudo-C-block 

[George]

SO question for this (with images): https://stackoverflow.com/q/67046131/3310334

[George]

So the question would be, how to compile the attached image

Into 

console.log('1');

console.log('2');

(function () {

  console.log('3');

  console.log('4');

}());

[Maribeth Bottorff]

My first question is, why not use a block with an actual statement input? In your example, what if a user wanted additional code afterwards that shouldn't be wrapped? How would you distinguish between what should be wrapped and what shouldn't? That seems like a statement input would be the best solution to me, then you can use statementToCode like you said in your first message.

If you don't want to do that though, the "print 3" block in your example is the child of the purple block, so you could `blockToCode` on the first child of the purple block and it would return the code for all the blocks below it as well. Is that enough for what you want to do?

Maribeth

[George]

I suspect using workspace.blockToCode(block.childBlocks_[0]) will produce output like

console.log('1');

console.log('2');

(function () {

  console.log('3');

}());

console.log('3');

console.log('4');

With repetition of the below blocks, which is not what I would like:

console.log('1');

console.log('2');

(function () {

  console.log('3');

  console.log('4');

}());

And regarding your question, all following blocks should be included

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[Maribeth Bottorff]

Can you share why you don't want to use a statement input? That seems like the best fitting paradigm so knowing why you don't want to use it may help find an alternative solution. If you don't want to allow blocks after the statement input block, you can remove the nextConnection input.

Maribeth

[George]

For abstraction. For example to compile a wait () seconds block to javascript, output has to be setTimeout(function () { .... (everything following the block }, time);

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[Maribeth Bottorff]

Here's how I would make a block to do that. This screenshot is from Blockly Developer Tools. It has a numeric input field to grab the wait time, and a statement input to get the actions that should be inside the setTimeout. It only has a previousConnection, so you can't add actions that come after this that are outside of the setTimeout.

A for loop is really the same concept. You have some collection of statements and you want to wrap them in additional code (i.e. add the for loop syntax surrounding the stack of blocks). So using something that works in a similar way makes sense to me. 

Would a block like that work? If not, I think you'd have to resort to some kind of hack like checking if any of a block's parents are your special block, and changing the code generation for all other blocks to take that into account, but if you have a specific problem with the block design like I've shown here then maybe we can help you work around that problem.