Sha256: 5dc0dd3b525a65880cc26b9c4be039cdc14b5809e93e04ed4a019c76634d776b
Contents?: true
Size: 1.25 KB
Versions: 122
Compression:
Stored size: 1.25 KB
Contents
package minesweeper
import (
"bytes"
"errors"
)
func (b Board) Count() error {
if len(b) < 2 {
return errors.New("need top and bottom border")
}
last := len(b) - 1
if len(b[last]) != len(b[0]) {
return errors.New("top and bottom border must be same size")
}
if err := border(b[0]); err != nil {
return err
}
if err := border(b[last]); err != nil {
return err
}
w := len(b[0])
lc := w - 1
for r := 1; r < last; r++ {
row := b[r]
if len(row) != w {
return errors.New("all rows must be same size")
}
if row[0] != '|' || row[lc] != '|' {
return errors.New("left and right borders must be '|'")
}
for c := 1; c < lc; c++ {
switch row[c] {
default:
return errors.New("only ' ' and '*' allowed")
case '*':
case ' ':
n := 0
for rm, rz := r-1, r+1; rm <= rz; rm++ {
rowm := b[rm]
for cm, cz := c-1, c+1; cm <= cz; cm++ {
if rowm[cm] == '*' {
n++
}
}
}
if n > 0 {
row[c] = '0' + byte(n)
}
}
}
}
return nil
}
func border(b []byte) error {
switch {
case len(b) < 2 || b[0] != '+' || b[len(b)-1] != '+':
return errors.New("need '+' in corners")
case bytes.Count(b, []byte{'-'}) != len(b)-2:
return errors.New("top and bottom borders must be '-'")
}
return nil
}
Version data entries
122 entries across 122 versions & 1 rubygems