Som
moonscript
Som | moonscript | |
---|---|---|
8 | 35 | |
22 | 3,126 | |
- | - | |
0.0 | 4.4 | |
over 1 year ago | 6 months ago | |
C++ | Lua | |
GNU General Public License v3.0 only | - |
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Som
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Making Smalltalk on a Raspberry Pi (2020)
> Smalltalkish
Have a look at the SOM dialect which is successfully used in education: http://som-st.github.io/
Here is an implementation in C++ which runs on LuaJIT: https://github.com/rochus-keller/Som/
> unfortunately out of print book Smalltalk 80: the language and its implementation is commonly recommended
I assume you know this link: http://stephane.ducasse.free.fr/FreeBooks/BlueBook/Bluebook....
Here is an implementation in C++ and Lua: https://github.com/rochus-keller/Smalltalk
- Do transpilers just use a lot of string manipulation and concatenation to output the target language?
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Ask HN: Admittedly Useless Side Projects?
- https://github.com/rochus-keller/Smalltalk/ Parser, code model, interpreter and navigable browser for the original Xerox Smalltalk-80 v2 sources and virtual image file
- https://github.com/rochus-keller/Som/ Parser, code model, navigable browser and VM for the SOM Smalltalk dialect
- https://github.com/rochus-keller/Simula A Simula 67 parser written in C++ and Qt
> do you regret those endeavours?
No, not in any way; the projects were very entertaining and gave me interesting insights.
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Ask HN: Recommendation for general purpose JIT compiler
If your DSL is statically typed then I recommend that you have a look at the Mono CLR; it's compatible with the ECMA-335 standard and the IR (CIL) is well documented, even with secondary literature.
If your DSL is dynamically typed I recommend LuaJIT; the bytecode is lean and documented (not as good as CIL though). LuaJIT also works well with statically typed languages, but Mono is faster in the latter case. Even if it was originally built for Lua any compiler can generate LuaJIT bytecode.
Both approaches are lean (Mono about 8 MB, LuaJIT about 1 MB), general purpose, available on many platforms and work well (see e.g. https://github.com/rochus-keller/Oberon/ and https://github.com/rochus-keller/Som/).
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When is Smalltalk's speed an issue?
At the latest when you run a benchmark suite like Are-we-fast-yet; here are some measurment results: http://software.rochus-keller.info/are-we-fast-yet_crystal_lua_node_som_pharo_i386_results_2020-12-29.pdf. See also https://github.com/rochus-keller/Som/ and https://github.com/rochus-keller/Smalltalk.
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LuaJIT for backend?
LuaJIT is well suited as a backend/runtime environment for custom languages; I did it several times (see e.g. https://github.com/rochus-keller/Smalltalk, https://github.com/rochus-keller/Som/, https://github.com/rochus-keller/Oberon/). I also implemented a bit of infrastructure to ease the reuse: https://github.com/rochus-keller/LjTools. LuaJIT has some limitations though; if you require closures you have to know that the corresponding LuaJIT FNEW bytecode is not yet supported by the JIT, i.e. switches to the interpreter; as a work-around I implemented my own closures; LuaJIT also doesn't support multi-threading, but co-routines; and there is no debugger, and the infrastructure to implement one has limitations (i.e. performance is low when running to breakpoints). For most of my projects this was no issue. Recently I switched to CIL/Mono for my Oberon+ implementation which was a good move. But still I consider LuaJIT a good choice if you can cope with the mentioned limitations. The major advantage of LuaJIT is the small footprint and impressive performance for dynamic languages.
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Optimizing an old interpreted language: where to begin?
One option is to leverage someone else's JIT: you could, for example, rewrite the interpreter to transpile to Lua source, which is then run in LuaJIT. There's a Smalltalk dialect which does this successfully; the Lua version runs in 1/12th the time of the C interpreted version. https://github.com/rochus-keller/Som You can use LuaJIT's FFI to call back into the Stunt server, or else just rewrite it completely in Lua --- large parts of the Stunt server will just go away in a native Lua implementation (e.g. the object database is just a table). Javascript would be another candidate for this.
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JITted lang which is faster than C?
This is a completely different kind of measurement; unfortunately this is not clear enough from my Readme. I wanted to find out, how well my naive Bluebook interpreter performs on LuaJIT (using my virtual meta tracing approach) compared to Cog, which is a dedicatd Smalltalk VM optimized with whatever genious approaches over two decades (or even longer considering the long experience record by Elliot). This experiment continues in https://github.com/rochus-keller/Som, because I didn't want to modify the original Smalltalk image. I found that my naive LuaJIT based approach is about factor seven behind the highly optimized Cog/Spur, and further improvements would require similar optimization tricks as in the latter.
moonscript
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Why Fennel?
Now I like lua, and think single pass is the way to go for interpreted, since you don't have the disadvantage of a slow compile time no matter how big your codebase gets, BUT its not great to write in. things like +=, ++, are not possible, which means the only solution is to transpile into it, which has led to some good languages like moonscript[0], teal[1] which offers static type checking, an absolute must as your codebase grows.
[0]: https://moonscript.org/
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Forth: The programming language that writes itself: The Web Page
That can be very productive and clever, but be - and stay - aware that such polyglot solutions tend to be maintenance headaches in the longer run.
There is a really nice open source project out there that allows you to train your hearing and your sightreading, but it's written in the authors own language which in turn compiles to JavaScript and the headache to set up their toolchain is such that I haven't bothered fixing any of the bugs that I'm aware of (and there are plenty).
https://sightreading.training/
https://github.com/leafo/sightreading.training
It's written in a language called 'Moonscript':
https://github.com/leafo/moonscript
Which compiles to Lua. Which compiles to JS.
Madness. Nice madness, but still, it stopped me from being a contributor.
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Lua: The Little Language That Could
RE: the cost of switching at this point, what about languages that compile to Lua? Like https://moonscript.org/. That would let you keep the legacy code, no?
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Trying to make a website with Lapis
In the case of Lapis, it is actually written in Moonscript, which needs a few more things.
- Launch HN: Moonrepo (YC W23) – Open-source build system
- Using Lua with C++
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Using other languages
There's also some languages made to compile straight to Lua: - MoonScript is the most popular Lua wrapper - it's built to be more Python-like, featuring indentation-based scopes, function calls without parentheses, lambda syntax, list comprehension, and much more. - Yuescript is a modern update to MoonScript that adds more features (I haven't used it myself, so I'm not entirely sure exactly how it differs from MS). - Teal is a version of Lua that adds static typing for better code standards.
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Best Websites For Coders
A programmer-friendly language that compiles to Lua.
- data types in function definition
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A MiniTron In 47 Lines
This is a sample code for learning, written in Moonscript for TIC-80:
What are some alternatives?
Smalltalk - Parser, code model, interpreter and navigable browser for the original Xerox Smalltalk-80 v2 sources and virtual image file
Yuescript - A Moonscript dialect compiles to Lua.
rockstar - Makes you a Rockstar C++ Programmer in 2 minutes
nelua-lang - Minimal, efficient, statically-typed and meta-programmable systems programming language heavily inspired by Lua, which compiles to C and native code.
qbe-rs - QBE IR in natural Rust data structures
TypeScriptToLua - Typescript to lua transpiler. https://typescripttolua.github.io/
ubpf - Userspace eBPF VM
luau - A fast, small, safe, gradually typed embeddable scripting language derived from Lua
sljit - Platform independent low-level JIT compiler
TIC-80 - TIC-80 is a fantasy computer for making, playing and sharing tiny games.
Oberon - Oberon parser, code model & browser, compiler and IDE with debugger
LuaJIT - Mirror of the LuaJIT git repository