init

internal/challenge/input.go

@@ -0,0 +1,70 @@
+package challenge
+
+import (
+	"bufio"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
+)
+
+func readConfig(r io.Reader) (Config, error) {
+	var cfg Config
+	if err := json.NewDecoder(r).Decode(&cfg); err != nil {
+		return cfg, err
+	}
+	return cfg, nil
+}
+
+func readEvents(r io.Reader) ([]Event, error) {
+	var events []Event
+	scanner := bufio.NewScanner(r)
+	lineNo := 0
+	for scanner.Scan() {
+		lineNo++
+		line := strings.TrimSpace(scanner.Text())
+		if line == "" {
+			continue
+		}
+		event, err := parseEvent(line)
+		if err != nil {
+			return nil, fmt.Errorf("line %d: %w", lineNo, err)
+		}
+		events = append(events, event)
+	}
+	return events, scanner.Err()
+}
+
+func parseEvent(line string) (Event, error) {
+	fields := strings.Fields(line)
+	if len(fields) < 3 {
+		return Event{}, errors.New("not enough fields")
+	}
+	if len(fields[0]) != len("[15:04:05]") || fields[0][0] != '[' || fields[0][len(fields[0])-1] != ']' {
+		return Event{}, errors.New("bad time format")
+	}
+	at, err := parseClock(fields[0][1 : len(fields[0])-1])
+	if err != nil {
+		return Event{}, err
+	}
+	player, err := strconv.Atoi(fields[1])
+	if err != nil {
+		return Event{}, err
+	}
+	id, err := strconv.Atoi(fields[2])
+	if err != nil {
+		return Event{}, err
+	}
+
+	return Event{At: at, Player: player, ID: id, Extra: strings.Join(fields[3:], " ")}, nil
+}
+
+func parseNonNegativeInt(value string) (int, bool) {
+	if strings.TrimSpace(value) != value || value == "" || strings.Contains(value, " ") {
+		return 0, false
+	}
+	n, err := strconv.Atoi(value)
+	return n, err == nil && n >= 0
+}