| Add enums, Option/Result, `?`, and the machinery base16ct needs around them b0ccd80 nandithebull 8h ago | 1 | //! Multi-file input and `#[cfg]` evaluation. |
| 2 | //! |
| 3 | //! The differential runner drives one `.rs` per case, so the multi-file path |
| 4 | //! and the feature-gating that goes with it are checked here instead. A Rust |
| 5 | //! crate splits across files with `mod`; Nim has no equivalent inside a single |
| 6 | //! output file, so the items are flattened in argument order. |
| 7 | |
| 8 | use std::fs; |
| 9 | use std::path::{Path, PathBuf}; |
| 10 | use std::process::Command; |
| 11 | |
| 12 | const RUSTNIM: &str = env!("CARGO_BIN_EXE_rustnim"); |
| 13 | |
| 14 | fn work(name: &str) -> PathBuf { |
| 15 | let d = Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/.work").join(name); |
| 16 | let _ = fs::remove_dir_all(&d); |
| 17 | fs::create_dir_all(&d).unwrap(); |
| 18 | d |
| 19 | } |
| 20 | |
| 21 | fn run(dir: &Path, args: &[&str]) -> (bool, String, String) { |
| 22 | let out = Command::new(RUSTNIM) |
| 23 | .args(args) |
| 24 | .env("TMPDIR", dir) |
| 25 | .output() |
| 26 | .expect("spawn rustnim"); |
| 27 | ( |
| 28 | out.status.success(), |
| 29 | String::from_utf8_lossy(&out.stdout).into_owned(), |
| 30 | String::from_utf8_lossy(&out.stderr).into_owned(), |
| 31 | ) |
| 32 | } |
| 33 | |
| 34 | #[test] |
| 35 | fn files_are_flattened_into_one_module() { |
| 36 | let d = work("multifile"); |
| 37 | let a = d.join("a.rs"); |
| 38 | let b = d.join("b.rs"); |
| 39 | fs::write(&a, "pub fn double(x: i32) -> i32 { x * 2 }\n").unwrap(); |
| 40 | fs::write( |
| 41 | &b, |
| 42 | "fn main() { println!(\"{}\", double(21)); }\n", |
| 43 | ) |
| 44 | .unwrap(); |
| 45 | |
| 46 | // `double` is defined in a.rs and called from b.rs: it resolves only |
| 47 | // because both were passed in. |
| 48 | let (ok, out, err) = run(&d, &[a.to_str().unwrap(), b.to_str().unwrap()]); |
| 49 | assert!(ok, "multi-file transpile failed: {err}"); |
| 50 | assert!(out.contains("proc double"), "missing `double`:\n{out}"); |
| 51 | assert!(out.contains("proc main"), "missing `main`:\n{out}"); |
| 52 | |
| 53 | // b.rs alone must fail rather than emit a call to something undefined. |
| 54 | let (ok, _, err) = run(&d, &[b.to_str().unwrap()]); |
| 55 | assert!(!ok, "b.rs alone should not transpile"); |
| 56 | assert!(err.contains("unknown function `double`"), "unexpected: {err}"); |
| 57 | } |
| 58 | |
| 59 | #[test] |
| 60 | fn cfg_is_evaluated_against_the_feature_set() { |
| 61 | let d = work("cfg"); |
| 62 | let f = d.join("c.rs"); |
| 63 | fs::write( |
| 64 | &f, |
| 65 | "#[cfg(feature = \"extra\")]\n\ |
| 66 | fn extra() -> i32 { 1 }\n\ |
| 67 | #[cfg(not(feature = \"extra\"))]\n\ |
| 68 | fn plain() -> i32 { 2 }\n\ |
| 69 | fn main() {}\n", |
| 70 | ) |
| 71 | .unwrap(); |
| 72 | |
| 73 | let (ok, out, err) = run(&d, &[f.to_str().unwrap()]); |
| 74 | assert!(ok, "{err}"); |
| 75 | assert!(!out.contains("proc extra"), "gated-off item was emitted:\n{out}"); |
| 76 | assert!(out.contains("proc plain"), "gated-on item missing:\n{out}"); |
| 77 | |
| 78 | let (ok, out, err) = run(&d, &[f.to_str().unwrap(), "--cfg", "feature=extra"]); |
| 79 | assert!(ok, "{err}"); |
| 80 | assert!(out.contains("proc extra"), "feature item missing:\n{out}"); |
| 81 | assert!(!out.contains("proc plain"), "`not(feature)` item was emitted:\n{out}"); |
| 82 | } |
| 83 | |
| 84 | #[test] |
| 85 | fn an_unevaluable_cfg_predicate_is_reported_not_assumed() { |
| 86 | let d = work("cfg-unknown"); |
| 87 | let f = d.join("d.rs"); |
| 88 | fs::write( |
| 89 | &f, |
| 90 | "#[cfg(target_os = \"linux\")]\nfn only_linux() -> i32 { 1 }\nfn main() {}\n", |
| 91 | ) |
| 92 | .unwrap(); |
| 93 | let (ok, _, err) = run(&d, &[f.to_str().unwrap()]); |
| 94 | assert!(!ok, "an unevaluable cfg must not be silently resolved"); |
| 95 | assert!(err.contains("not a predicate rustnim can evaluate"), "unexpected: {err}"); |
| 96 | } |