Hog/QL tasklist - Githubissues

Consolidated todos for the Hog language. There's another list to track the HogQL todos, and this does not directly touch upon the CDP project. This list is a work in progress.

Hog todo

[x] Hog in template string
[x] Objects, arrays, tuples and nested assignment
[x] Support for JSON parsing and stringifying
[x] Add bytecode to state for serialization
[x] Run the same set of tests for both python and typescript VMs
[x] Debugger
[x] Bit of AST/VM work
- [x] Global objects fail
- [x] Can we get rid of semicolons
- [x] Return does not work without a value but gets interpreted as a field/string (fixed in the same PR)
- [x] for loops
- [x] Add more comment types?
- [x] How to call ~Log/Print/Echo~ print
[x] Placeholders should not parse inside Hog
[x] Trailing commas
[x] C++ parser
[x] Make editing Hog not suck v1 (errors, syntax highlighting)
[x] Make editing Hog not suck v2 (autocomplete for template strings and expressions)
[x] Make editing Hog not suck v3 (autocomplete in Hog, bring in inputs and other globals)
[x] Ternary operators (? :) don't work (translated to if(...)
[x] Nullish coalescing (?.) support
[x] Swap to RE2 for regex in HogVMs - make regexes safe for user input (see codeql)
[x] Add resource monitoring and limits to ensure things like unbounded Arrays don't exhaust resources (see codeql)
[x] Ensure function access is definitely safe (see codeql)
[x] for-in loops / iterators
[x] Date functions
[x] Hash functions for Kinesis
[x] Report undefined globals (easy to make typos)
[x] Make a decision on string quotes and dict keys (it's fine with better editor support)
[x] Make a decision on array indexes starting with 0 vs 1 https://github.com/PostHog/product-internal/pull/623
[x] Exceptions
[x] Ways to bring down used memory?
[x] Implement lambdas and closures
[x] Change fn to fun
[x] Run Hog natively in the browser
[x] Run Hog in multi-part notebooks (tech demo)
[x] typeof for Avo plugin
[ ] Spec out the STL and then add all the functions
[ ] Keep using maps in TS?
[ ] Assure object equality is done by value everywhere
[ ] Get HogQL/SQL nodes into the bytecode to run(select *) natively
[ ] Add map* fields, work well with hogqlX as well.
[ ] Optimize Hog's stack and internal objects (e.g. callables) to use less space
[ ] Deprecate ?. ?
[ ] Move function in front of args in bytecode for CALL_LOCAL
[ ] Quit early (no 2nd hop after webhooks if not needed)
[ ] Types for variables and function arguments / return
[ ] Prettier for Hog/QL
[ ] re2 in the Python HogVM (we're not using it live today)
[ ] Remove DECLARE_FN
[ ] Replace crypto with webcrypto (& polyfill on the nodejs side)

PostHog / meta

Hog/QL tasklist #208

Hog todo

HogQL todos