johnnybt_dsl

一台装好的 mruby 虚拟机。跑几段 Ruby，取回它产出的那个字符串 —— 就这些。

from johnnybt_dsl import compile, run

words = compile(open("dsl.rb").read(), "dsl.rb")     # 一个进程编一次
ir = run([(words, "dsl.rb"), (source, "策略.rb")], answer="MyDSL.result")

词是你自己的。 这个包不知道什么是策略、什么是因子，也不规定 IR 长什么样：那都是拿它写 DSL 的项目说了算。写死一套词就成了只服务一个项目的库。

装上就能用：wheel 里 mruby 已经编好了，用的人不需要 GCC，也不需要 Ruby。那两样只有我们构建 wheel 时才要。

安装

pip install johnnybt-dsl

预编译轮子，一个平台一个，abi3 绑 Python 3.11、覆盖 3.11–3.14：

	x86_64	arm64
Linux	manylinux_2_28（glibc 2.28 及以上）	manylinux_2_28（glibc 2.28 及以上）
macOS	10.12 及以上	11.0 及以上
Windows	有	有

linux 的门槛比同系的两个 polars 插件（2.17）高一档，是因为这个包要编 C： mruby 的构建会跑它刚编出来的 mrbc，所以每一格都得在自己的架构上原生构建，而 pypa 提供原生镜像的最老的一档是 glibc 2.28。

API


`compile(source, name) -> bytes`	编成字节码。字节码和解释器无关，编一次到处 load
`run(chunks, answer, context) -> str`	按顺序跑几段（源码或字节码），再跑 `answer`，返回它的字符串。`context` 进全局变量 `$johnny_context`（惯例是 JSON，基类懒解析成 `JohnnyBtDSL.context`）
`run_file(path, before, answer)`	同上，最后一段读自文件

一次 run 一个解释器：一份文件定义的东西不会漏进下一份。几段之间共用一个编译上下文，所以局部变量跨得过去 —— 它们像一段程序，不像几份互不相干的文件。

里面有什么

件	做什么
`build.rs`	取 mruby（钉住某个 commit）、按 `build_config.rb` 编、链接 `libmruby.a`
`src/sys.rs`	mruby 的 C API，手写的 extern 声明。十来个函数，不用生成器
`src/shim.c`	mruby 里是宏的那几个（`mrb_test` / `mrb->exc`）和编译入口的跳板
`src/engine.rs`	解释器的生命周期，以及「跑几段、取一个字符串」
`mrbgems/mruby-json/`	我们自己的 gem：`JSON.generate` / `#to_json` / `JSON.parse`，双向都在 C 里（解析错误带字节位）
`mrbgems/mruby-dsl/`	我们自己的 gem：`JohnnyBtDSL::Base` —— DSL 的基类（注册、declare、逐语句 trouble、manifest/ir 信封、`JohnnyBtDSL.context`）。词不在这里，词归定义语言的项目

一处 mruby 的实情

mruby 开发线上的 Prism 编译器带全局状态（mrc_init_presym 写一个文件级的 offset），两个解释器同时编译会互相踩。我们钉的是稳定版，它的解析器状态都在 mrb_parser_state 里、没有这个全局 —— 但 run / compile 那把锁留着：一次求值不到一毫秒，串行的代价是零，而下次挪版本时谁都不用再想起这件事。

构建（只有我们要）

Rust、C 编译器
Ruby —— mruby 自己的 rake 要它（brew install ruby）。解析器由 parse.y 生成，但生成好的 y.tab.c 随发布版一起来，不要 bison

构建走真 rake -m（并行）：mruby 自带的 minirake 完全串行，316 个目标文件一个一个编，32 核机器上要几分钟；rake -m 同一棵树 4 秒。没有 rake 时退回 minirake。vendor/mruby 不进 git，第一次 cargo build 自己取。

测试：vendor/mruby/build/host/bin/mruby mrbgems/run_tests.rb（gem 那侧）与 cargo test（引擎那侧）。

许可

本包 MIT（见 LICENSE）。wheel 里静态链接了 mruby（MIT，见 LICENSE-mruby，版权归 mruby developers）；两个 mrbgem（mruby-json、mruby-dsl）是本仓库自己写的，同样 MIT。

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johnnybt-dsl 0.1.2

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