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punchcard.go
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punchcard.go
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package punchit
import (
"fmt"
"strings"
)
// punch card dimensions (IBM 5081)
const cols = 80
const rows = 12
// Punchcard struct
type Punchcard struct {
src string // source listing at top
punches [cols]string // holes for each column
}
func (p *Punchcard) String() string {
var sb strings.Builder
r := strings.NewReplacer("0", " ", "1", "X")
// top
sb.WriteString(fmt.Sprintf(" %s", strings.Repeat("_", cols+2)))
sb.WriteString(fmt.Sprintf("\n / %*s |", -cols, p.src))
// punches
sb.WriteString(fmt.Sprintf("\n12 / %s |", r.Replace(p.GetRow(0))))
sb.WriteString(fmt.Sprintf("\n11 | %s |", r.Replace(p.GetRow(1))))
for i := 2; i < rows; i++ {
sb.WriteString(fmt.Sprintf("\n %d | %s |", i-2, r.Replace(p.GetRow(i))))
}
// bottom
sb.WriteString(fmt.Sprintf("\n |%s|", strings.Repeat("_", cols+4)))
return sb.String()
}
// GetRow returns row of punchcard as binary string of holes.
func (p *Punchcard) GetRow(i int) string {
var row string
for j := 0; j < cols; j++ {
row += string(p.punches[j][i])
}
return row
}
// GetCol returns transposed column of punchcard as binary string of holes.
func (p *Punchcard) GetCol(i int) string {
return p.punches[i]
}