93 lines
2.1 KiB
Go
93 lines
2.1 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"os"
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"regexp"
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"strconv"
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"strings"
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)
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var (
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inputFile = flag.String("input", "input.txt", "input filename")
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nRegex = regexp.MustCompile(`(?m)\d`)
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reMap = map[string]string{
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"one": "1",
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"two": "2",
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"three": "3",
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"four": "4",
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"five": "5",
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"six": "6",
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"seven": "7",
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"eight": "8",
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"nine": "9",
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}
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)
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func main() {
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flag.Parse()
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input, err := os.ReadFile(*inputFile)
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if err != nil {
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panic(err)
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}
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var sum int
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for _, line := range strings.Split(string(input), "\n") {
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if strings.TrimSpace(line) == "" {
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continue
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}
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// forward-scan for spelled digits
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var forwardReplacedLine, backwardReplacedLine string
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for i := 0; i < len(line); i++ {
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forwardReplacedLine += string(line[i])
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// replace found digit by its non-word counterpart (e.g. "one" -> "1")
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for key, val := range reMap {
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forwardReplacedLine = strings.ReplaceAll(forwardReplacedLine, key, val)
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}
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}
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fmt.Println(forwardReplacedLine)
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// backward-scan for spelled digits
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for i := len(line) - 1; i >= 0; i-- {
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if i == len(line)-1 {
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backwardReplacedLine = string(line[i])
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} else {
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backwardReplacedLine = string(line[i]) + backwardReplacedLine
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}
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// replace found digit by its non-word counterpart (e.g. "one" -> "1")
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for key, val := range reMap {
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backwardReplacedLine = strings.ReplaceAll(backwardReplacedLine, key, val)
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}
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}
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fmt.Println(backwardReplacedLine)
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// find single digits in forward-replaced line
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firstMatch := nRegex.FindAllStringSubmatch(forwardReplacedLine, -1)
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// find single digits in backward-replaced line
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lastMatch := nRegex.FindAllStringSubmatch(backwardReplacedLine, -1)
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// get first matchgroup, first match (aka first digit in forwardReplacedLine)
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first := firstMatch[0][0]
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// get last matchgroup, first match (aka last digit in backwardReplacedLine)
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last := lastMatch[len(lastMatch)-1:][0][0]
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fmt.Println(first + last)
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// concatenate digits and convert the resulting string to int
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asInt, err := strconv.Atoi(first + last)
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if err != nil {
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panic(err)
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}
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sum += asInt
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}
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fmt.Println(sum)
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}
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