print_digit_map.go


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package main

import (
	"aphopkins/radix_info/factors"
	"fmt"
	"io"
	"strconv"
	"strings"
)

func writeDigitMap(w io.Writer, digitMap []factors.DigitType) {
	if len(digitMap) <= 2 {
		panic("Radices cannot be less than 2!")
	} else if len(digitMap) <= 36 {
		writeDigitMapSmall(w, digitMap)
	}
}

// Prints a digit map suitable for small bases (≤36).
func writeDigitMapSmall(w io.Writer, digitMap []factors.DigitType) {
	radix := uint(len(digitMap))
	digitsString := strings.Builder{}
	digitsString.Grow(int(3*radix + 6))
	digitsString.WriteString("Digit:")
	typesString := strings.Builder{}
	typesString.WriteString("Class:")
	for digit, digitType := range digitMap {
		digitString := fmt.Sprintf("%2s", strings.ToUpper(
			strconv.FormatUint(uint64(digit), int(radix))))
		typeString := digitType.String()
		fmt.Fprintf(&digitsString, " %s", digitString)
		fmt.Fprintf(&typesString, " %s", typeString)
	}

	fmt.Fprintln(w, digitsString.String())
	fmt.Fprintln(w, typesString.String())
}