30 lines
728 B
Go
30 lines
728 B
Go
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package queenattack
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import (
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"errors"
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"math"
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)
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// CanQueenAttack takes two positions one for a
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// white queen (wq) and one for a black queen (bq)
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// it returns a boolean value: if an attack can
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// be made, and an error
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func CanQueenAttack(wq, bq string) (bool, error) {
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if len(wq) != 2 || len(bq) != 2 ||
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wq[0] < 'a' || wq[0] > 'z' ||
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wq[1] < '0' || wq[1] > '8' ||
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bq[0] < 'a' || bq[0] > 'z' ||
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bq[1] < '0' || bq[1] > '8' ||
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wq == bq {
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return false, errors.New("Invalid pieces/placement")
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}
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wx, wy := float64(int8(wq[0])), float64(int8(wq[1]))
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bx, by := float64(int8(bq[0])), float64(int8(bq[1]))
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if wx == bx || wy == by ||
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math.Abs(wx-bx) == math.Abs(wy-by) {
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return true, nil
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}
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return false, nil
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}
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