Brummel
9cf0e3e81c
Eleven binary builtins (+ - * / % == != < <= > >=) render as lhs op rhs when called with two args (tail-flagged keeps prefix). Standard Rust-aligned 4-level precedence table elides parens. not(x) renders as !x. Long /// doc strings wrap at 80 cols on word boundaries. bench_list_sum: 'if ==(n, 0)' becomes 'if n == 0', '+(acc, h)' becomes 'acc + h', tail keyword still visible on tail calls. 19 new unit tests (47 total). 4 snapshots (3 re-rendered + 1 new bench fixture). Public API unchanged.
74 lines
2.5 KiB
Rust
74 lines
2.5 KiB
Rust
//! Iter 20a snapshot tests.
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//!
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//! For each `examples/<name>.ail.json`, the renderer's output is
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//! compared against the committed `examples/<name>.prose.txt`. The
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//! snapshot files are part of the repo: changing the renderer requires
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//! a deliberate snapshot update, which is the point of this test.
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//!
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//! Update protocol (manual): regenerate the file by running
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//! `cargo run -p ail -- prose <fixture>.ail.json > <fixture>.prose.txt`
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//! once the renderer change is agreed; commit alongside the change.
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//! There is no `UPDATE_SNAPSHOTS=1` environment short-cut here on
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//! purpose — Iter 20a is the seeding round, and we want every change
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//! after this to be visible in a diff.
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use std::path::PathBuf;
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fn examples_dir() -> PathBuf {
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// tests/ runs with CARGO_MANIFEST_DIR == crates/ailang-prose.
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let mut p = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
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p.pop();
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p.pop();
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p.push("examples");
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p
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}
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fn check_snapshot(stem: &str) {
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let dir = examples_dir();
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let json_path = dir.join(format!("{stem}.ail.json"));
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let prose_path = dir.join(format!("{stem}.prose.txt"));
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let module = ailang_core::load_module(&json_path)
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.unwrap_or_else(|e| panic!("failed to load {json_path:?}: {e}"));
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let actual = ailang_prose::module_to_prose(&module);
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let expected = std::fs::read_to_string(&prose_path)
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.unwrap_or_else(|e| panic!("failed to read snapshot {prose_path:?}: {e}"));
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if actual != expected {
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// Write `.actual` for inspection, then fail.
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let actual_path = dir.join(format!("{stem}.prose.txt.actual"));
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std::fs::write(&actual_path, &actual).expect("write .actual");
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panic!(
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"prose snapshot mismatch for {stem}.\n\
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Expected: {prose_path:?}\n\
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Actual: {actual_path:?}\n\
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To accept the new output, replace the expected file with the .actual file."
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);
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}
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}
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#[test]
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fn snapshot_rc_own_param_drop() {
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check_snapshot("rc_own_param_drop");
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}
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#[test]
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fn snapshot_rc_match_arm_partial_drop_leak() {
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check_snapshot("rc_match_arm_partial_drop_leak");
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}
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#[test]
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fn snapshot_rc_app_let_partial_drop_leak() {
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check_snapshot("rc_app_let_partial_drop_leak");
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}
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/// Iter 20b: this fixture exercises the infix renderer + paren elision.
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/// Pre-20b, the body had `if ==(n, 0) { ... }` and `tail sum_acc(-(n,
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/// 1), ICons(-(n, 1), acc))`; after 20b those collapse to `if n == 0`
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/// and `n - 1`. If this regresses, the renderer is broken.
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#[test]
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fn snapshot_bench_list_sum() {
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check_snapshot("bench_list_sum");
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}
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