chore: checkpoint before Python removal

vendor/zmij/tests/exhaustive.rs

@@ -0,0 +1,58 @@
+#![cfg_attr(not(check_cfg), allow(unexpected_cfgs))]
+
+use std::sync::atomic::{AtomicU32, Ordering};
+use std::sync::Arc;
+use std::thread;
+
+#[test]
+#[cfg_attr(not(exhaustive), ignore = "requires cfg(exhaustive)")]
+fn test_exhaustive() {
+    const BATCH_SIZE: u32 = 1_000_000;
+    let counter = Arc::new(AtomicU32::new(0));
+    let finished = Arc::new(AtomicU32::new(0));
+
+    let mut workers = Vec::new();
+    for _ in 0..num_cpus::get() {
+        let counter = counter.clone();
+        let finished = finished.clone();
+        workers.push(thread::spawn(move || loop {
+            let batch = counter.fetch_add(1, Ordering::Relaxed);
+            if batch > u32::MAX / BATCH_SIZE {
+                return;
+            }
+
+            let min = batch * BATCH_SIZE;
+            let max = if batch == u32::MAX / BATCH_SIZE {
+                u32::MAX
+            } else {
+                min + BATCH_SIZE - 1
+            };
+
+            let mut zmij_buffer = zmij::Buffer::new();
+            let mut ryu_buffer = ryu::Buffer::new();
+            for u in min..=max {
+                let f = f32::from_bits(u);
+                if !f.is_finite() {
+                    continue;
+                }
+                let zmij = zmij_buffer.format_finite(f);
+                assert_eq!(Ok(f), zmij.parse());
+                let ryu = ryu_buffer.format_finite(f);
+                let matches = if ryu.contains('e') && !ryu.contains("e-") {
+                    ryu.split_once('e') == zmij.split_once("e+")
+                } else {
+                    ryu == zmij
+                };
+                assert!(matches, "{ryu} != {zmij}");
+            }
+
+            let increment = max - min + 1;
+            let update = finished.fetch_add(increment, Ordering::Relaxed);
+            println!("{}", u64::from(update) + u64::from(increment));
+        }));
+    }
+
+    for w in workers {
+        w.join().unwrap();
+    }
+}

vendor/zmij/tests/ryu_comparison.rs

@@ -0,0 +1,36 @@
+use rand::rngs::{SmallRng, SysRng};
+use rand::{Rng as _, SeedableRng as _};
+
+const N: usize = if cfg!(miri) {
+    500
+} else if let b"0" = opt_level::OPT_LEVEL.as_bytes() {
+    1_000_000
+} else {
+    100_000_000
+};
+
+#[test]
+fn ryu_comparison() {
+    let mut ryu_buffer = ryu::Buffer::new();
+    let mut zmij_buffer = zmij::Buffer::new();
+    let mut rng = SmallRng::try_from_rng(&mut SysRng).unwrap();
+    let mut fail = 0;
+
+    for _ in 0..N {
+        let bits = rng.next_u64();
+        let float = f64::from_bits(bits);
+        let ryu = ryu_buffer.format(float);
+        let zmij = zmij_buffer.format(float);
+        let matches = if ryu.contains('e') && !ryu.contains("e-") {
+            ryu.split_once('e') == zmij.split_once("e+")
+        } else {
+            ryu == zmij
+        };
+        if !matches {
+            eprintln!("RYU={ryu} ZMIJ={zmij}");
+            fail += 1;
+        }
+    }
+
+    assert!(fail == 0, "{fail} mismatches");
+}

vendor/zmij/tests/test.rs

@@ -0,0 +1,121 @@
+#![allow(clippy::float_cmp, clippy::unreadable_literal)]
+
+fn dtoa(value: f64) -> String {
+    zmij::Buffer::new().format(value).to_owned()
+}
+
+fn ftoa(value: f32) -> String {
+    zmij::Buffer::new().format(value).to_owned()
+}
+
+mod dtoa_test {
+    use super::dtoa;
+
+    #[test]
+    fn normal() {
+        assert_eq!(dtoa(6.62607015e-34), "6.62607015e-34");
+
+        // Exact half-ulp tie when rounding to nearest integer.
+        assert_eq!(dtoa(5.444310685350916e+14), "544431068535091.6");
+    }
+
+    #[test]
+    fn subnormal() {
+        assert_eq!(dtoa(0.0f64.next_up()), "5e-324");
+        assert_eq!(dtoa(1e-323), "1e-323");
+        assert_eq!(dtoa(1.2e-322), "1.2e-322");
+        assert_eq!(dtoa(1.24e-322), "1.24e-322");
+        assert_eq!(dtoa(1.234e-320), "1.234e-320");
+    }
+
+    #[test]
+    fn all_irregular() {
+        for exp in 1..0x3ff {
+            let bits = exp << 52;
+            let value = f64::from_bits(bits);
+
+            assert_eq!(dtoa(value), ryu::Buffer::new().format(value));
+        }
+    }
+
+    #[test]
+    fn all_exponents() {
+        for exp in 0..=0x3ff {
+            let bits = (exp << 52) | 1;
+            let value = f64::from_bits(bits);
+
+            assert_eq!(dtoa(value), ryu::Buffer::new().format(value));
+        }
+    }
+
+    #[test]
+    fn small_int() {
+        assert_eq!(dtoa(1.0), "1.0");
+    }
+
+    #[test]
+    fn zero() {
+        assert_eq!(dtoa(0.0), "0.0");
+        assert_eq!(dtoa(-0.0), "-0.0");
+    }
+
+    #[test]
+    fn inf() {
+        assert_eq!(dtoa(f64::INFINITY), "inf");
+    }
+
+    #[test]
+    fn nan() {
+        assert_eq!(dtoa(f64::NAN.copysign(-1.0)), "NaN");
+    }
+
+    #[test]
+    fn shorter() {
+        // A possibly shorter underestimate is picked (u' in Schubfach).
+        assert_eq!(dtoa(-4.932096661796888e-226), "-4.932096661796888e-226");
+
+        // A possibly shorter overestimate is picked (w' in Schubfach).
+        assert_eq!(dtoa(3.439070283483335e+35), "3.439070283483335e+35");
+    }
+
+    #[test]
+    fn single_candidate() {
+        // Only an underestimate is in the rounding region (u in Schubfach).
+        assert_eq!(dtoa(6.606854224493745e-17), "6.606854224493745e-17");
+
+        // Only an overestimate is in the rounding region (w in Schubfach).
+        assert_eq!(dtoa(6.079537928711555e+61), "6.079537928711555e+61");
+    }
+
+    #[test]
+    fn null_terminated() {
+        assert_eq!(dtoa(9.061488e15), "9061488000000000.0");
+        assert_eq!(dtoa(f64::NAN.copysign(1.0)), "NaN");
+    }
+
+    #[test]
+    fn no_buffer() {
+        assert_eq!(dtoa(6.62607015e-34), "6.62607015e-34");
+    }
+}
+
+mod ftoa_test {
+    use super::ftoa;
+
+    #[test]
+    fn normal() {
+        assert_eq!(ftoa(6.62607e-34), "6.62607e-34");
+        assert_eq!(ftoa(1.342178e+08), "134217800.0");
+        assert_eq!(ftoa(1.3421781e+08), "134217810.0");
+    }
+
+    #[test]
+    fn subnormal() {
+        assert_eq!(ftoa(0.0f32.next_up()), "1e-45");
+    }
+
+    #[test]
+    fn no_buffer() {
+        assert_eq!(ftoa(6.62607e-34), "6.62607e-34");
+    }
+}