Eryn Wells
09bf17d66b
Add another sub-iterator to the PawnMoveGenerator that produces promotion pushes or capture moves (depending on move_type) when a pawn moves to the back rank. Also implement en passant moves. Fix a bug in the Left and Right captures branches where the wrong neighbors used to calculate origin squares. Add a whole bunch of tests. Still missing several cases though.
61 lines
1.5 KiB
Rust
61 lines
1.5 KiB
Rust
// Eryn Wells <eryn@erynwells.me>
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use chessfriend_core::Shape;
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#[repr(u16)]
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#[derive(Clone, Copy, Debug, Eq, PartialEq)]
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pub enum Kind {
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Quiet = 0b0000,
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DoublePush = 0b0001,
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KingSideCastle = 0b0010,
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QueenSideCastle = 0b0011,
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Capture = 0b0100,
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EnPassantCapture = 0b0101,
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Promotion = 0b1000,
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CapturePromotion = 0b1100,
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}
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#[repr(u16)]
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#[derive(Copy, Clone, Debug, Eq, PartialEq)]
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pub enum PromotionShape {
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Knight = 0b00,
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Bishop = 0b01,
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Rook = 0b10,
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Queen = 0b11,
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}
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impl PromotionShape {
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pub const NUM: usize = 4;
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pub const ALL: [PromotionShape; PromotionShape::NUM] = [
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PromotionShape::Knight,
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PromotionShape::Bishop,
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PromotionShape::Rook,
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PromotionShape::Queen,
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];
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}
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impl From<PromotionShape> for Shape {
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fn from(value: PromotionShape) -> Self {
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match value {
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PromotionShape::Knight => Shape::Knight,
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PromotionShape::Bishop => Shape::Bishop,
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PromotionShape::Rook => Shape::Rook,
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PromotionShape::Queen => Shape::Queen,
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}
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}
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}
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impl TryFrom<Shape> for PromotionShape {
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type Error = ();
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fn try_from(value: Shape) -> Result<Self, Self::Error> {
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match value {
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Shape::Knight => Ok(PromotionShape::Knight),
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Shape::Bishop => Ok(PromotionShape::Bishop),
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Shape::Rook => Ok(PromotionShape::Rook),
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Shape::Queen => Ok(PromotionShape::Queen),
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_ => Err(()),
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}
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}
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}
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