Experiments with python 3.9 pegen parser for Skulpt

Deno
Velociraptor
Pre-commit - pre-commit install must be executed for this plugin to have an effect

vr build
- bundles the typescript files into a javascript bundle)
vr bundle
- an alternative to build - uses deno bundle - no minified version
vr format
- runs the precommit hooks for all files
vr gen_parser [-v --verbose --verbosity]=1|2
- generates the javascript parser. Use --verbose|-v|--verbosity to generate a verbose parser.
vr gen_asdl
- generates the javascript astnodes
vr gen_ast
- regenerates the ast for the run-test files from python and dumps the ast in .ast files
vr gen_gramar_patch
- run this after you manually changed the gramar file to store your changes
vr apply_gramar_patch
- run this patch the gramar with the changes stored in the patch
vr parse <filename|number> [--nc --no_comapre] [--mode=exec]
- parses a python file and logs the generated ast vs the python ast
vr parse_str <code string> [--nc --no_comapre] [--mode=exec]
- parses a python file and logs the generated ast vs the python ast
vr symtable <filename|number>
- parses the file and created a symbol table for that ast and prints it
vr test <shortname> [-f --fail-fast] [-v]
- run a test - shortnames: pypeg, parse, dump, symtable

See Deno docs on the subject.

# example script execution for inspection use the [--inspect-brk] flag
deno run -A --inspect-brk scripts/parse.ts tmp.txt

Open chrome://inspect and click Inspect below Target:

This will open chrome devtools.
The execution of the script will be paused.
Run the profiler or add break points to the source and resume the execution (Click pretty-print in source files to display times from profiling)

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