feat(engine): Implement template expression functions

[daryllimyt]

Features

• Implement inline function calling in template expressions
• Invoke this using the FNS context like such:

# Just expression
${{ FNS.less_than(ACTIONS.path.to.value, int(5)) }}

# With inline typecast
${{ FNS.less_than(ACTIONS.path.to.value, int(5)) -> str }}

Security

• We never call eval as part of this implementation
• We only allow a strict subset of values and use a very simple subset of builtin functions

This is a prerequisite to having conditional execution.

Testing

• Added relevant tests
• All tests/unit/test_template_expressions.py passing

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
tracecat	❌ Failed (Inspect)			Jun 6, 2024 1:08am