aoc2023/day-5/util.go

package main

import (
	"bufio"
	"log"
	"os"
	"regexp"
	"strconv"
	"strings"
	"unicode"
)

// readlines reads lines from stdin.
// Then it returns them as an array of strings
func readlines() []string {
	lines := []string{}

	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		lines = append(lines, scanner.Text())
	}

	if err := scanner.Err(); err != nil {
		log.Fatal(err)
	}

	return lines
}

// parseLines parses input to a data map
func parseLines(lines []string) {
	var _regex_identifier = regexp.MustCompile(`(?P<identifier>[\w-]+) map[:]`)

	f := func(c rune) bool {
		return !unicode.IsDigit(c)
	}

	for i := 0; i < len(lines); i++ {
		if i == 0 {
			seeds = convertToInts(strings.FieldsFunc(lines[i], f))
			continue
		}

		m := _regex_identifier.FindStringSubmatch(lines[i])
		if len(m) == 2 {
			for i = i + 1; i < len(lines) && len(lines[i]) != 0; i++ {
				nums := convertToInts(strings.FieldsFunc(lines[i], f))
				dataMap[m[1]] = append(dataMap[m[1]], Data{dest: nums[0], source: nums[1], offset: nums[2]})
			}
		}
	}
}

// convertToInts converts a string representing ints to an array of ints
func convertToInts(data []string) []int {
	nums := []int{}
	for _, elem := range data {
		n, _ := strconv.Atoi(elem)
		nums = append(nums, n)
	}
	return nums
}

/*
func isChecked(i int) bool {
	for _, bound := range checked {
		if i > bound.start && i < bound.end {
			return true
		}
	}
	return false
}
*/