kadai3-1 by @int128

kadai3-1/int128/README.md

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+# kadai3-1
+
+```
+% go run main.go
+Are you ready? Type words in 30 seconds!
+--
+door
+>> door
+apple
+>> apple
+farm
+>> farm
+nose
+>> nose
+town
+>> town
+stomach
+>> stomach
+cup
+>> cup
+band
+>> band
+watch
+>> watch
+pipe
+>> pipe
+pin
+>> pin
+train
+>> train
+coat
+>> coat
+plate
+>> plate
+oven
+>> oven
+brush
+>> b
+Time up! You got 15 point(s).
+```
+
+
+## 課題3-1
+
+> タイピングゲームを作ろう
+>
+> - 標準出力に英単語を出す（出すものは自由）
+> - 標準入力から1行受け取る
+> - 制限時間内に何問解けたか表示する
+
+## 課題3-2
+
+> 分割ダウンロードを行う
+> 
+> - Rangeアクセスを用いる
+> - いくつかのゴルーチンでダウンロードしてマージする
+> - エラー処理を工夫する: golang.org/x/sync/errgourpパッケージなどを使ってみる
+> - キャンセルが発生した場合の実装を行う

kadai3-1/int128/game/game.go

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+package game
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"time"
+)
+
+// Game represents a typing game.
+type Game struct {
+	Vocabulary Vocabulary
+	Timeout    time.Duration
+	Reader     io.Reader
+}
+
+// Score represents a game score.
+type Score struct {
+	CorrectWords int
+	TotalWords   int
+	GiveUp       bool
+}
+
+// New returns a new game.
+func New(vocabulary Vocabulary, timeout time.Duration) *Game {
+	return &Game{vocabulary, timeout, os.Stdin}
+}
+
+// Start starts a game and waits for timeout or cancel (ctrl+D).
+// If timeout or cancel occurred, this returns the score.
+// If any error occurred, this returns the error.
+func (g *Game) Start(ctx context.Context) (*Score, error) {
+	ctx, cancel := context.WithTimeout(ctx, g.Timeout)
+	defer cancel()
+	errCh := make(chan error)
+	defer close(errCh)
+	score := &Score{}
+
+	go g.scanLines(score, cancel, errCh)
+
+	select {
+	case <-ctx.Done():
+		if err := ctx.Err(); err != context.DeadlineExceeded && err != context.Canceled {
+			return nil, err
+		}
+		return score, nil
+	case err := <-errCh:
+		return nil, err
+	}
+}
+
+func (g *Game) scanLines(score *Score, cancel func(), errCh chan<- error) {
+	s := bufio.NewScanner(g.Reader)
+	for {
+		expected := g.Vocabulary.NextWord()
+		fmt.Printf("%s\n>> ", expected)
+		if !s.Scan() {
+			score.GiveUp = true
+			cancel()
+			return
+		}
+		if err := s.Err(); err != nil {
+			errCh <- err
+			return
+		}
+		if expected == s.Text() {
+			score.CorrectWords++
+		}
+		score.TotalWords++
+	}
+}

kadai3-1/int128/game/game_test.go

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+package game
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestGameScanLines(t *testing.T) {
+	v := Vocabulary([]string{"foo"})
+	r := strings.NewReader("foo\nfoo\nbar")
+	g := &Game{v, time.Second, r}
+	s := &Score{}
+	c := 0
+	cancel := func() { c++ }
+	g.scanLines(s, cancel, make(chan error))
+
+	if c != 1 {
+		t.Errorf("cancel should be called once but %d", c)
+	}
+	if s.GiveUp != true {
+		t.Errorf("s.GiveUp wants true but %v", s.GiveUp)
+	}
+	if s.CorrectWords != 2 {
+		t.Errorf("s.CorrectWords wants 2 but %d", s.CorrectWords)
+	}
+	if s.TotalWords != 3 {
+		t.Errorf("s.TotalWords wants 3 but %d", s.TotalWords)
+	}
+}

kadai3-1/int128/game/vocabulary.go

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+package game
+
+import "math/rand"
+
+// Vocabulary is a set of words.
+type Vocabulary []string
+
+// NextWord returns a random word.
+func (w Vocabulary) NextWord() string {
+	index := rand.Intn(len(w))
+	return w[index]
+}
+
+// Things in https://en.wiktionary.org/wiki/Appendix:Basic_English_word_list
+var Things = Vocabulary([]string{
+	"angle", "ant", "apple", "arch", "arm", "army", "baby", "bag", "ball", "band", "basin", "basket", "bath", "bed", "bee", "bell", "berry", "bird", "blade", "board", "boat", "bone", "book", "boot", "bottle", "box", "boy", "brain", "brake", "branch", "brick", "bridge", "brush", "bucket", "bulb", "button", "cake", "camera", "card", "cart", "carriage", "cat", "chain", "cheese", "chest", "chin", "church", "circle", "clock", "cloud", "coat", "collar", "comb", "cord", "cow", "cup", "curtain", "cushion", "dog", "door", "drain", "drawer", "dress", "drop", "ear", "egg", "engine", "eye", "face", "farm", "feather", "finger", "fish", "flag", "floor", "fly", "foot", "fork", "fowl", "frame", "garden", "girl", "glove", "goat", "gun", "hair", "hammer", "hand", "hat", "head", "heart", "hook", "horn", "horse", "hospital", "house", "island", "jewel", "kettle", "key", "knee", "knife", "knot", "leaf", "leg", "library", "line", "lip", "lock", "map", "match", "monkey", "moon", "mouth", "muscle", "nail", "neck", "needle", "nerve", "net", "nose", "nut", "office", "orange", "oven", "parcel", "pen", "pencil", "picture", "pig", "pin", "pipe", "plane", "plate", "plough", "pocket", "pot", "potato", "prison", "pump", "rail", "rat", "receipt", "ring", "rod", "roof", "root", "sail", "school", "scissors", "screw", "seed", "sheep", "shelf", "ship", "shirt", "shoe", "skin", "skirt", "snake", "sock", "spade", "sponge", "spoon", "spring", "square", "stamp", "star", "station", "stem", "stick", "stocking", "stomach", "store", "street", "sun", "table", "tail", "thread", "throat", "thumb", "ticket", "toe", "tongue", "tooth", "town", "train", "tray", "tree", "trousers", "umbrella", "wall", "watch", "wheel", "whip", "whistle", "window", "wing", "wire", "worm",
+})

kadai3-1/int128/game/vocabulary_test.go

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+package game
+
+import (
+	"fmt"
+)
+
+func ExampleVocabulary_NextWord() {
+	v := Vocabulary([]string{"foo"})
+	fmt.Print(v.NextWord())
+	// Out: foo
+}

kadai3-1/int128/main.go

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+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"math/rand"
+	"os"
+	"time"
+
+	"github.com/gopherdojo/dojo2/kadai3-1/int128/game"
+)
+
+func main() {
+	rand.Seed(time.Now().UnixNano())
+	g := game.New(game.Things, 30*time.Second)
+	fmt.Fprintf(os.Stderr, "Are you ready? Type words in 30 seconds!\n--\n")
+
+	ctx := context.Background()
+	score, err := g.Start(ctx)
+	switch {
+	case err != nil:
+		log.Fatal(err)
+	case score.GiveUp:
+		fmt.Fprintf(os.Stderr, "\nGive up? You got %d point(s).\n", score.CorrectWords)
+	default:
+		fmt.Fprintf(os.Stderr, "\nTime up! You got %d point(s).\n", score.CorrectWords)
+	}
+}