feat(rust): codeupipe-compile, a pipeline written as plain Rust

.github/workflows/ci.yml

@@ -119,6 +119,30 @@ jobs:
         run: >-
           cargo run --locked -q -- --strict src tests ../codeupipe-rs/src
           ../codeupipe-rs/examples ../codeupipe-rs/tests ../../conformance/runners/rust/src
+          ../codeupipe-compile-rs/src ../codeupipe-compile-rs/tests ../codeupipe-compile-rs/examples
+      - name: The oldest Rust that the crate supports (rust-version)
+        run: |
+          rustup toolchain install 1.75 --profile minimal
+          cargo +1.75 test --locked
+
+  rust-compile:
+    name: Rust compiler
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: packages/codeupipe-compile-rs
+    steps:
+      - uses: actions/checkout@v5
+      # A workspace of its own: it downloads syn, quote and prettyplease
+      # from crates.io, at the versions in its Cargo.lock.
+      - name: Format
+        run: cargo fmt --check
+      - name: Clippy
+        run: cargo clippy --locked --all-targets -- -D warnings
+      - name: Tests
+        run: cargo test --locked
+      - name: Compiled against the pipeline (numbers only)
+        run: cargo run --locked --release -q --example bench
       - name: The oldest Rust that the crate supports (rust-version)
         run: |
           rustup toolchain install 1.75 --profile minimal

.gitignore

@@ -12,3 +12,4 @@ node_modules/
 
 /target/
 /packages/codeupipe-lint-rs/target/
+/packages/codeupipe-compile-rs/target/

README.md

@@ -37,8 +37,9 @@ This repository has seven packages.
 | `codeupipe` for TypeScript | The eight primitives. No dependencies | [packages/codeupipe-ts/README.md](packages/codeupipe-ts/README.md) |
 | `codeupipe-lint` for TypeScript | A linter for pipeline code in TypeScript | [packages/codeupipe-lint-ts/README.md](packages/codeupipe-lint-ts/README.md) |
 | `codeupipe-compile` for TypeScript | Writes a pipeline as plain TypeScript with no import of codeupipe | [packages/codeupipe-compile-ts/README.md](packages/codeupipe-compile-ts/README.md) |
-| `codeupipe` for Rust | The primitives, 0.1.0. No dependencies. No compiler yet | [packages/codeupipe-rs/README.md](packages/codeupipe-rs/README.md) |
+| `codeupipe` for Rust | The primitives, 0.1.0. No dependencies | [packages/codeupipe-rs/README.md](packages/codeupipe-rs/README.md) |
 | `codeupipe-lint` for Rust | A linter for pipeline code in Rust, for the rules that the compiler does not check | [packages/codeupipe-lint-rs/README.md](packages/codeupipe-lint-rs/README.md) |
+| `codeupipe-compile` for Rust | Writes a pipeline as plain Rust: a struct and functions, with no codeupipe | [packages/codeupipe-compile-rs/README.md](packages/codeupipe-compile-rs/README.md) |
 
 ## Install
 
@@ -208,6 +209,7 @@ An editable install needs pip 21.3 or later.
 | `packages/codeupipe-compile-ts/` | The TypeScript compiler, with its tests |
 | `packages/codeupipe-rs/` | The Rust runtime, with its tests and its examples |
 | `packages/codeupipe-lint-rs/` | The Rust linter, with its tests. A Cargo workspace of its own |
+| `packages/codeupipe-compile-rs/` | The Rust compiler, with its tests. A Cargo workspace of its own |
 | `conformance/` | The contract ([API.md](conformance/API.md)), the cases, the runners, the benchmark |
 | `tests/` | The tests for the two Python packages |
 | `examples/pricing/` | The example, with its test in `tests/examples/` |

conformance/API.md

@@ -242,7 +242,7 @@ map and fails the comparison.
 | Run | `run` is sync. `run_async` is opt-in | One `run`. It returns a Promise. A step can be sync or async | `run` is sync, and `run_with_state` for the caller's State. No async run yet |
 | Absent | `None` | `null` | `None` from `get`; `Value::Null` is a JSON null |
 | Label of a step | `type(step).__name__` | `step.constructor.name` | The name of the step's type, from `std::any::type_name` |
-| Compile | `codeupipe.compile` | `packages/codeupipe-compile-ts` | None yet |
+| Compile | `codeupipe.compile` | `packages/codeupipe-compile-ts` | `packages/codeupipe-compile-rs`: a struct with one field for each key. No conformance target yet |
 | Linter | `packages/codeupipe-lint` | `packages/codeupipe-lint-ts` | None yet. The compiler refuses several of the shapes that the linters find |
 | A type of your own | Any object with `copy()` | `class Order implements PipelineData<Order>`, then `new Pipeline<Order>()`, `Filter<Order>` | `impl PipelineData for Order {}`, then `Pipeline<Order>`, `Filter<Order>` |
 

docs/rust-plan.md

@@ -432,6 +432,26 @@ core, a dynamic step costs about 25 ns, and the dynamic run is faster than
 compiled Python in four of the five scenarios. The compiler waits until a
 real pipeline shows a need.
 
+**Started (2026-10-28), as a struct and not a value type.** Hand-compiled
+forms were measured against `Pipeline::run`, on the five scenarios, the
+pricing example and a step of real text work. Plain functions on a Payload
+(the shape that this plan first had in mind, with a `Value` in the module)
+gain 1.1 to 1.7 times: about 10 ns a step. A static pipeline from generics
+reaches the same with no compiler. The large gain is the data: with a struct
+that has one field for each key, the pricing example runs in about 2 ns, and
+work on text 3 times faster. So the first version of the compiler writes a
+struct, and keeps the rest of this section's rules: the same output, a
+refusal with the place, a codeupipe pipeline itself. It is in
+`packages/codeupipe-compile-rs/` ([README](../packages/codeupipe-compile-rs/README.md)).
+Not in it yet: the conformance target `rust:static`, and nested pipelines.
+
+The next gain was measured by hand before it was built: the compiled code
+reads the caller's text where it is, and copies only the text that no step
+writes, so signup went from 3.1 to 5.9 times faster than `Pipeline::run`.
+Computing only the keys that the caller keeps would gain more where an
+output that nobody keeps is expensive. It waits for a real pipeline that
+shows the need: [#25](https://github.com/orchestrate-solutions/codeupipe/issues/25).
+
 ### The value type in compiled code
 
 Plain Python has `dict`, and plain TypeScript has `Map`. Plain Rust has no
@@ -537,7 +557,7 @@ correctness. The others are about form.
 | 0 | Settle D1 to D10 | One review of this page |
 | 1 | Core crate, example, README | About 600 lines with tests (TypeScript: 415 lines of source) |
 | 2 | Runner, `run.py`, bench, CI, documents | About 400 lines, most of it the JSON reader and the `cup_ops` |
-| 3 | Compiler and `rust:static`, if the benchmark says so | About 1,000 lines (TypeScript: 851 lines of source) |
+| 3 | Compiler and `rust:static`. **Started**: the compiler, as a struct; `rust:static` not yet | About 1,000 lines (TypeScript: 851 lines of source). Written: 1,471 of source, 268 of tests |
 | 4 | Linter. **Done** | About 1,200 lines (written: 2,060 of source with its comments, 950 of tests) |
 
 Phases 1 and 2 are one release: `codeupipe` 0.1.0 for Rust, in the

packages/codeupipe-compile-rs/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "codeupipe-compile"
+version = "0.1.0"
+edition = "2021"
+rust-version = "1.75"
+description = "Writes a codeupipe pipeline in Rust as plain Rust: a struct and functions, with no codeupipe."
+license = "Apache-2.0"
+repository = "https://github.com/orchestrate-solutions/codeupipe"
+readme = "README.md"
+keywords = ["pipeline", "filter", "payload", "compiler"]
+# Not on crates.io yet. A version below 1.0 is not stable.
+publish = false
+
+[[bin]]
+name = "codeupipe-compile"
+path = "src/main.rs"
+
+[dependencies]
+codeupipe = { path = "../codeupipe-rs" }
+# Lines and columns of the syntax tree, outside a procedural macro.
+proc-macro2 = { version = "1.0.80", default-features = false, features = ["span-locations"] }
+quote = { version = "1.0.35", default-features = false }
+syn = { version = "2.0.60", default-features = false, features = ["full", "parsing", "printing", "clone-impls", "visit", "visit-mut"] }
+prettyplease = "0.2.20"
+
+# A workspace of its own, as the linter: the crates of the root workspace
+# have no dependencies and build with no download.
+[workspace]

packages/codeupipe-compile-rs/LICENSE

@@ -0,0 +1,177 @@
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packages/codeupipe-compile-rs/NOTICE

@@ -0,0 +1,4 @@
+codeupipe
+Copyright 2026 Orchestrate LLC
+
+Licensed under the Apache License, Version 2.0. See LICENSE.