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monkey.go
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/
monkey.go
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package exercises
import (
"fmt"
"strconv"
"strings"
)
func parse(instr string) map[string]string {
out := make(map[string]string, strings.Count(instr, "\n")+1)
for _, line := range strings.Split(instr, "\n") {
name, action, _ := strings.Cut(line, ": ")
out[name] = action
}
return out
}
func calc(name string, raw map[string]string, done map[string]int) (int, error) {
if val, ok := done[name]; ok {
return val, nil
}
action := strings.Split(raw[name], " ")
switch len(action) {
case 1:
if val, err := strconv.Atoi(action[0]); err != nil {
return 0, err
} else {
done[name] = val
}
case 3:
left, err := calc(action[0], raw, done)
if err != nil {
return 0, fmt.Errorf("calculating left of %q: %w", name, err)
}
right, err := calc(action[2], raw, done)
if err != nil {
return 0, fmt.Errorf("calculating right of %q: %w", name, err)
}
switch action[1] {
case "+":
done[name] = left + right
case "-":
done[name] = left - right
case "*":
done[name] = left * right
case "/":
done[name] = left / right
default:
return 0, fmt.Errorf("unknown operator: %s", action[1])
}
}
return done[name], nil
}