98 lines
2.3 KiB
Rust
98 lines
2.3 KiB
Rust
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pub fn pop_lsb(value: &mut u64) -> usize {
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let idx = value.trailing_zeros() as usize;
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*value &= !(1 << idx);
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return idx;
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}
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pub fn pop_msb(value: &mut u64) -> usize {
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let idx = 63 - value.leading_zeros() as usize;
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*value &= !(1 << idx);
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return idx;
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}
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const RANK_NUMBERS: [char; 8] = ['1', '2', '3', '4', '5', '6', '7', '8'];
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const FILE_LETTERS: [char; 8] = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'];
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pub fn notation_from_square_number(sq: u8) -> String {
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let row = sq / 8;
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let col = sq % 8;
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let mut notation = String::new();
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let row_not = RANK_NUMBERS[row as usize];
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let col_not = FILE_LETTERS[col as usize];
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notation.push(col_not);
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notation.push(row_not);
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return notation;
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}
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// <----- TESTS ----->
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn pop_lsb_test() {
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// test setup
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let test_values: [u64; 6] = [
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0x8000_0000_0000_0000,
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0x4E91_CF05_713E_451B,
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0xD588_2D58_6962_34B0,
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0x9581_3335_DCAB_1DD4,
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0xBEAC_DBE0_903A_AC00,
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0x01E8_C895_A6F0_0000
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];
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let expected_values: [usize; 6] = [63, 0, 4, 2, 10, 20];
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// tests
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for index in 0..6 {
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let mut test_value = test_values[index];
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assert_eq!(pop_lsb(&mut test_value), expected_values[index])
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}
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}
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#[test]
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fn pop_msb_test() {
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// test setup
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let test_values: [u64; 6] = [
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0x86D6_8EB0_96A8_8D1C,
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0x0000_0000_0000_0001,
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0x3809_24AF_A7AE_8129,
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0x0277_DA36_3B31_86D9,
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0x0000_C1C3_201C_0DB1,
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0x0000_0203_0DE4_E944
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];
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let expected_values: [usize; 6] = [63, 0, 61, 57, 47, 41];
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// tests
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for index in 0..6 {
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let mut test_value = test_values[index];
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assert_eq!(pop_msb(&mut test_value), expected_values[index])
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}
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}
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#[test]
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fn notation_from_square_number_test() {
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// test setup
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let square_indices: [u8; 8] = [1, 12, 22, 27, 32, 47, 53, 58];
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let notations: [String; 8] = [
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String::from("b1"),
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String::from("e2"),
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String::from("g3"),
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String::from("d4"),
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String::from("a5"),
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String::from("h6"),
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String::from("f7"),
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String::from("c8")
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];
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// tests
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for index in 0..8 {
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let notation = notation_from_square_number(square_indices[index].clone());
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assert_eq!(notation, notations[index]);
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}
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}
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} |