add day-13 + benchmarks

day-13/internal/util/util.go

@@ -0,0 +1,56 @@
+package util
+
+import (
+	"bufio"
+	"io"
+	"regexp"
+	"strconv"
+
+	"github.com/onyx-and-iris/aoc2024/day-13/internal/machine"
+)
+
+var (
+	reButton = regexp.MustCompile(`Button (?P<identifier>[A|B]): X\+(?P<xdigit>\d+), Y\+(?P<ydigit>\d+)`)
+	rePrize  = regexp.MustCompile(`Prize: X\=(?P<xdigit>\d+), Y\=(?P<ydigit>\d+)`)
+)
+
+func ParseLines(r io.Reader) ([]*machine.Machine, error) {
+	var matches [][]string
+
+	scanner := bufio.NewScanner(r)
+	for scanner.Scan() {
+		lineBytes := scanner.Bytes()
+		if len(lineBytes) == 0 {
+			continue
+		}
+
+		var m []string
+		switch line := string(lineBytes); {
+		case reButton.Match(lineBytes):
+			m = reButton.FindStringSubmatch(line)
+		case rePrize.Match(lineBytes):
+			m = rePrize.FindStringSubmatch(line)
+		}
+
+		matches = append(matches, m)
+	}
+
+	var machines []*machine.Machine
+	for i := 0; i < len(matches); i += 3 {
+		machines = append(machines, machine.New(matches[i], matches[i+1], matches[i+2]))
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+
+	return machines, nil
+}
+
+func mustConv(s string) int {
+	n, err := strconv.Atoi(s)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}