mirror of
https://github.com/storytold/wordcraft.git
synced 2026-11-09 20:00:11 -06:00
31 lines
1.3 KiB
Rust
31 lines
1.3 KiB
Rust
//! A count of the characters a paragraph's object lookups walk, the blocks
|
|
//! [`crate::Document::para_paths`] visits, and each block lookup by path with the table levels it
|
|
//! descends, for the linear-time tests of the crates that use them: an input 8x the size must cost
|
|
//! about 8x the steps, which a busy machine can't skew the way it skews a timing. Counted only in
|
|
//! tests (this crate's, and other crates' through the `test-support` feature, which they turn on
|
|
//! as a dev-dependency); in the app the count is nothing.
|
|
|
|
#[cfg(any(test, feature = "test-support"))]
|
|
thread_local! {
|
|
/// The steps counted on this thread.
|
|
static STEPS: std::cell::Cell<u64> = const { std::cell::Cell::new(0) };
|
|
}
|
|
|
|
/// Count `n` steps of a walk (nothing outside tests). Public for the walks other crates do over a
|
|
/// paragraph's text themselves (Markdown and HTML comment export, for one).
|
|
#[inline(always)]
|
|
pub fn steps(n: usize) {
|
|
#[cfg(any(test, feature = "test-support"))]
|
|
STEPS.with(|s| s.set(s.get().saturating_add(n as u64)));
|
|
#[cfg(not(any(test, feature = "test-support")))]
|
|
let _ = n;
|
|
}
|
|
|
|
/// The steps `f` takes.
|
|
#[cfg(any(test, feature = "test-support"))]
|
|
pub fn count(f: impl FnOnce()) -> u64 {
|
|
let before = STEPS.with(std::cell::Cell::get);
|
|
f();
|
|
STEPS.with(std::cell::Cell::get).saturating_sub(before)
|
|
}
|