Display Block Execution Trace

[Ross Hamilton]

Hi there,

We are using Blockly to enable non-technical users to build FEEL expressions for business use cases.

When expressions are built with complex logic, we would like to enable them to follow the execution trace of the expression and show what blocks were executed.

Since Blockly only generates the code and doesn't really interact in any way with the execution, I suspect this is a non-trivial problem to solve. However, I was wondering if anybody has looked into doing something like this and where I could go to learn more.

Thanks!

[Neil Fraser]

Actually, this is well supported.  For a working example, just press the 'Run Program' button here:

https://blockly.games/maze?level=10#v7o5hy

To implement this, use your generator's STATEMENT_PREFIX property (or maybe STATEMENT_SUFFIX, depending on what works best for your application).  Here's the documentation:

https://developers.google.com/blockly/guides/app-integration/running-javascript#highlight_blocks

Let us know if you have any questions.

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Neil Fraser, Switzerland
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[Jalen Q]

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