Spoiler alert: Anselme run ~1.5x slower in LuaJIT than Lua 5.3/5.4. I didn't expected LuaJIT to be able to optimize anything with my super performant and cache friendly AST walker interpreter, but being this much slower is kinda impressive.
Woke up and felt like changing a couple things. It's actually been worked on for a while, little at a time...
The goal was to make the language and implementation much simpler. Well I don't know if it really ended up being simpler but it sure is more robust.
Main changes:
* proper first class functions and closures supports! proper scoping rules! no more namespace shenanigans!
* everything is an expression, no more statements! make the implementation both simpler and more complex, but it's much more consistent now! the syntax has massively changed as a result though.
* much more organized and easy to modify codebase: one file for each AST node, no more random fields or behavior set by some random node exceptionally, everything should now follow the same API defined in ast.abstract.Node
Every foundational feature should be implemented right now. The vast majority of things that were possible in v2 are possible now; some things aren't, but that's usually because v2 is a bit more sane.
The main missing things before a proper release are tests and documentation. There's a few other things that might be implemented later, see the ideas.md file.
* Integrated # and ~ decorators into the expression system. Created associated operators.
* # and ~ decorators only affect their current line. That's more useful...
* Fix our priority system to evaluate left-to-right instead of right-to-left (if there was a reason why I did it this way initially, I don't remember it so ¯\_(ツ)_/¯)
* a lotta internal changes
Various other small adjustments, see the diff of REFERENCE.md for details.
- Bumped to 0.15.0
- Add boot script
- Change variable definition syntax, using a = to distinguish more cleary between identifier and value
- Variables initial values are evaluated on first use instead of at parsing time
- Error on variable redefinition. Means you should make sure to load saves after your scripts.
- Improve string parsing, support for escape codes
- Remove support for number literals with empty decimal part (42. for 42.0) as there's no distinction in Anselme and it conflicts with .function call suffix
- Changed priority of : pair operator
- Add type type, and type annotations to variables and function parameters
- Change Lua function system to use regular Anselme functions
- Defining a function from Lua is now way simpler and require providing a full Anselme function signature
- Change Anselme function system
- Dynamic dispatch, based on arity, type annotation and parameter names. Will select the most specific function at runtime.
- Define way to overload most operators
- Allow custom type to text formatters
- Allow assignment to custom functions
- Index operator ( renamed to ()
- Functions with parameters each have their own private namespace (scoping ersatz)
- Internal: "custom"-mode operators now have their own expression AST type instead of cluttering the function system
- Remove static type checker as it is barely useful with new function system. May or may not rewrite one in the future.
- Improve error messages here and there
- Internal: cleaning
