Adds most of the toolsHEADmaster

1 files changed, 354 insertions, 0 deletions

diff --git a/v_windows/v/old/vlib/rand/sys/system_rng_test.v b/v_windows/v/old/vlib/rand/sys/system_rng_test.v
new file mode 100644
index 0000000..638ed10
--- /dev/null
+++ b/v_windows/v/old/vlib/rand/sys/system_rng_test.v
@@ -0,0 +1,354 @@
+import math
+import rand.sys
+
+const (
+	range_limit = 40
+	value_count = 1000
+	seeds       = [u32(42), 256]
+)
+
+const (
+	sample_size   = 1000
+	stats_epsilon = 0.05
+	inv_sqrt_12   = 1.0 / math.sqrt(12)
+)
+
+fn get_n_randoms(n int, r sys.SysRNG) []int {
+	mut ints := []int{cap: n}
+	for _ in 0 .. n {
+		ints << r.int()
+	}
+	return ints
+}
+
+fn test_sys_rng_reproducibility() {
+	// Note that C.srand() sets the seed globally.
+	// So the order of seeding matters. It is recommended
+	// to obtain all necessary data first, then set the
+	// seed for another batch of data.
+	for seed in seeds {
+		seed_data := [seed]
+		mut r1 := sys.SysRNG{}
+		mut r2 := sys.SysRNG{}
+		r1.seed(seed_data)
+		ints1 := get_n_randoms(value_count, r1)
+		r2.seed(seed_data)
+		ints2 := get_n_randoms(value_count, r2)
+		assert ints1 == ints2
+	}
+}
+
+// TODO: use the `in` syntax and remove this function
+// after generics has been completely implemented
+fn found(value u64, arr []u64) bool {
+	for item in arr {
+		if value == item {
+			return true
+		}
+	}
+	return false
+}
+
+fn test_sys_rng_variability() {
+	// If this test fails and if it is certainly not the implementation
+	// at fault, try changing the seed values. Repeated values are
+	// improbable but not impossible.
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		mut values := []u64{cap: value_count}
+		for i in 0 .. value_count {
+			value := rng.u64()
+			assert !found(value, values)
+			assert values.len == i
+			values << value
+		}
+	}
+}
+
+fn check_uniformity_u64(rng sys.SysRNG, range u64) {
+	range_f64 := f64(range)
+	expected_mean := range_f64 / 2.0
+	mut variance := 0.0
+	for _ in 0 .. sample_size {
+		diff := f64(rng.u64n(range)) - expected_mean
+		variance += diff * diff
+	}
+	variance /= sample_size - 1
+	sigma := math.sqrt(variance)
+	expected_sigma := range_f64 * inv_sqrt_12
+	error := (sigma - expected_sigma) / expected_sigma
+	assert math.abs(error) < stats_epsilon
+}
+
+fn test_sys_rng_uniformity_u64() {
+	// This assumes that C.rand() produces uniform results to begin with.
+	// If the failure persists, report an issue on GitHub
+	ranges := [14019545, 80240, 130]
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for range in ranges {
+			check_uniformity_u64(rng, u64(range))
+		}
+	}
+}
+
+fn check_uniformity_f64(rng sys.SysRNG) {
+	expected_mean := 0.5
+	mut variance := 0.0
+	for _ in 0 .. sample_size {
+		diff := rng.f64() - expected_mean
+		variance += diff * diff
+	}
+	variance /= sample_size - 1
+	sigma := math.sqrt(variance)
+	expected_sigma := inv_sqrt_12
+	error := (sigma - expected_sigma) / expected_sigma
+	assert math.abs(error) < stats_epsilon
+}
+
+fn test_sys_rng_uniformity_f64() {
+	// The f64 version
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		check_uniformity_f64(rng)
+	}
+}
+
+fn test_sys_rng_u32n() {
+	max := u32(16384)
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.u32n(max)
+			assert value >= 0
+			assert value < max
+		}
+	}
+}
+
+fn test_sys_rng_u64n() {
+	max := u64(379091181005)
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.u64n(max)
+			assert value >= 0
+			assert value < max
+		}
+	}
+}
+
+fn test_sys_rng_u32_in_range() {
+	max := u32(484468466)
+	min := u32(316846)
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.u32_in_range(min, max)
+			assert value >= min
+			assert value < max
+		}
+	}
+}
+
+fn test_sys_rng_u64_in_range() {
+	max := u64(216468454685163)
+	min := u64(6848646868)
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.u64_in_range(min, max)
+			assert value >= min
+			assert value < max
+		}
+	}
+}
+
+fn test_sys_rng_intn() {
+	max := 2525642
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.intn(max)
+			assert value >= 0
+			assert value < max
+		}
+	}
+}
+
+fn test_sys_rng_i64n() {
+	max := i64(3246727724653636)
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.i64n(max)
+			assert value >= 0
+			assert value < max
+		}
+	}
+}
+
+fn test_sys_rng_int_in_range() {
+	min := -4252
+	max := 23054962
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.int_in_range(min, max)
+			assert value >= min
+			assert value < max
+		}
+	}
+}
+
+fn test_sys_rng_i64_in_range() {
+	min := i64(-24095)
+	max := i64(324058)
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.i64_in_range(min, max)
+			assert value >= min
+			assert value < max
+		}
+	}
+}
+
+fn test_sys_rng_int31() {
+	max_u31 := int(0x7FFFFFFF)
+	sign_mask := int(0x80000000)
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.int31()
+			assert value >= 0
+			assert value <= max_u31
+			// This statement ensures that the sign bit is zero
+			assert (value & sign_mask) == 0
+		}
+	}
+}
+
+fn test_sys_rng_int63() {
+	max_u63 := i64(0x7FFFFFFFFFFFFFFF)
+	sign_mask := i64(0x8000000000000000)
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.int63()
+			assert value >= 0
+			assert value <= max_u63
+			assert (value & sign_mask) == 0
+		}
+	}
+}
+
+fn test_sys_rng_f32() {
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.f32()
+			assert value >= 0.0
+			assert value < 1.0
+		}
+	}
+}
+
+fn test_sys_rng_f64() {
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.f64()
+			assert value >= 0.0
+			assert value < 1.0
+		}
+	}
+}
+
+fn test_sys_rng_f32n() {
+	max := f32(357.0)
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.f32n(max)
+			assert value >= 0.0
+			assert value < max
+		}
+	}
+}
+
+fn test_sys_rng_f64n() {
+	max := 1.52e6
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.f64n(max)
+			assert value >= 0.0
+			assert value < max
+		}
+	}
+}
+
+fn test_sys_rng_f32_in_range() {
+	min := f32(-24.0)
+	max := f32(125.0)
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.f32_in_range(min, max)
+			assert value >= min
+			assert value < max
+		}
+	}
+}
+
+fn test_sys_rng_f64_in_range() {
+	min := -548.7
+	max := 5015.2
+	for seed in seeds {
+		seed_data := [seed]
+		mut rng := sys.SysRNG{}
+		rng.seed(seed_data)
+		for _ in 0 .. range_limit {
+			value := rng.f64_in_range(min, max)
+			assert value >= min
+			assert value < max
+		}
+	}
+}