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Top 23 Metaprogramming Open-Source Projects
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Nim
Nim is a statically typed compiled systems programming language. It combines successful concepts from mature languages like Python, Ada and Modula. Its design focuses on efficiency, expressiveness, and elegance (in that order of priority).
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Magic Enum C++
Static reflection for enums (to string, from string, iteration) for modern C++, work with any enum type without any macro or boilerplate code
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manifold
Manifold is a Java compiler plugin, its features include Metaprogramming, Properties, Extension Methods, Operator Overloading, Templates, a Preprocessor, and more.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
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Nameof C++
Nameof operator for modern C++, simply obtain the name of a variable, type, function, macro, and enum
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nelua-lang
Minimal, efficient, statically-typed and meta-programmable systems programming language heavily inspired by Lua, which compiles to C and native code.
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Spoon
Spoon is a metaprogramming library to analyze and transform Java source code. :spoon: is made with :heart:, :beers: and :sparkles:. It parses source files to build a well-designed AST with powerful analysis and transformation API.
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refl-cpp
Static reflection for C++17 (compile-time enumeration, attributes, proxies, overloads, template functions, metaprogramming).
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Project mention: 3 years of fulltime Rust game development, and why we're leaving Rust behind | news.ycombinator.com | 2024-04-26
Project mention: Insanity VS SpeziTemplateApplication - a user suggested alternative | libhunt.com/r/Sourcery | 2023-11-18
This time, I visited Groovy. Given my biased first impression about Java and the JVM, I wasn't too exited! But I couldn't have been more wrong! 😁
Project mention: What C++ library do you wish existed but hasn’t been created yet? | /r/cpp | 2023-07-08I'm not sure this is quite what you're asking for, but this library has been super helpful to me in the past : https://github.com/Neargye/magic_enum
Project mention: Ask HN: How can I get better at writing production-level Python? | news.ycombinator.com | 2023-07-18Yeah, reading the Fluent Python book[1] and / or following along with their support files[2] would a good way to start
[1] https://amzn.to/3J48u2J
[2] https://github.com/fluentpython/example-code-2e
Project mention: Show HN: Ditch your ORM with type-safe native SQL | news.ycombinator.com | 2024-04-09
Project mention: Rubberduck – A free and open-source VBIDE add-in | news.ycombinator.com | 2024-01-25
Project mention: Nelua: Statically typed language with a Lua flavor | news.ycombinator.com | 2024-04-22
Spoon
Anyway the need is not complicated, I need both entry and exit functions from every state, optionally allowing these functions to be coroutines (that's special sauce but for later), and an explicit state transition table which also have a way to say that a state can be accessed at any point. Also allow states to be state machines, optional FSM hierarchies. If you ignore the coroutine stuff it's pretty standard features these days, except that - Boost.MSM is quite archaic now (it was so novel when it was first released...) although it allows most of the features I talked about, I just think it will complicate my code unneecessarilly; - Boost-Ext.SML (not Boost) is almost perfect except it doesnt have entry/exit functions on states for some reason. Also last time we (as in in livestream) tried it in prototypes it didnt compile on msvc XD - Boost-Ext.SML2 is even better but still doesnt have entry/exit functions although it's in the plans.
Project mention: Out of bounds memory access in V8 in Google Chrome prior to 120.0.6099.224 | news.ycombinator.com | 2024-01-25You'd be surprised how much friction you'd have for C++ reflection. First, since it's a custom build step, you can do a mix of custom code gen and C++ constexpr/consteval for static reflection. Here's a header-only implementation for adding compile time reflection purely within the language [1]. And v8 already does dynamic code gen as part of its build process (to generate the snapshot to speedup instantiation of the isolate). Dynamic reflection is a must since JS is a dynamic language with reflection support.
Now of course, I don't know the specific details of reflection needed for the abstractions you reference and clearly V8 is still doing some amount of manual IR generation, so it's possible it would be a substantial investment to actually retrofit those techniques into v8. One would have to do a careful analysis of historical security exploits & specific techniques and their ability to prevent to figure out if it's worth adding those abstractions (especially since there is a potential performance tradeoff as you mention). As I said, I think there's insufficient research in this area to establish a compelling body of best practices (not to take away from the contributions of the GraalJS team to this space).
[1] https://github.com/veselink1/refl-cpp
There are also other approaches. Macro variants making use of `__VA_ARGS__` would be probably the best trade-off. If you want a slightly more ergonomic syntax, something like Metalang99 [1] will help (and the author even wrote a post about this exact subject [2]). Codegen is another option which may work better than other options depending on the situation and exact implementation strategy. And there is always the Reflection TS [3], which may or may not be incorporated to C++26...
[1] https://github.com/Hirrolot/metalang99
[2] https://hirrolot.github.io/posts/pretty-printable-enumeratio...
[3] https://en.cppreference.com/w/cpp/experimental/reflect
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Metaprogramming related posts
- Show HN: Metashade – a Pythonic GPU shading/compute EDSL
- A dialect of Lisp that's embedded in Python
- "14 Years of Go" by Rob Pike
- Rubberduck – A free and open-source VBIDE add-in
- Out of bounds memory access in V8 in Google Chrome prior to 120.0.6099.224
- Hylang, a Lisp dialect embedded in Python
- Hissp
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Index
What are some of the best open-source Metaprogramming projects? This list will help you:
| Project | Stars | |
|---|---|---|
| 1 | Nim | 16,060 |
| 2 | Insanity | 7,521 |
| 3 | groovy | 5,089 |
| 4 | hy | 4,775 |
| 5 | Magic Enum C++ | 4,403 |
| 6 | example-code-2e | 2,916 |
| 7 | manifold | 2,218 |
| 8 | Nameof C++ | 1,942 |
| 9 | Rubberduck | 1,852 |
| 10 | nelua-lang | 1,852 |
| 11 | Spoon | 1,669 |
| 12 | hana | 1,635 |
| 13 | dotNext | 1,527 |
| 14 | Chimney | 1,106 |
| 15 | Experimental Boost.DI | 1,103 |
| 16 | scala.meta | 1,087 |
| 17 | sml | 1,072 |
| 18 | proxy | 1,113 |
| 19 | refl-cpp | 986 |
| 20 | decorator | 811 |
| 21 | Scalafix | 802 |
| 22 | datatype99 | 794 |
| 23 | metalang99 | 765 |
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