🚀 implement repl (#17)

okazaki-kk · web-flow · commit 38840e19a3f6 · 2023-07-09T16:49:51.000+09:00
diff --git a/cmd/repl/main.go b/cmd/repl/main.go
@@ -0,0 +1,46 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"os/user"
+
+	"github.com/okazaki-kk/miniDB/internal/parser"
+	"github.com/okazaki-kk/miniDB/internal/parser/lexer"
+)
+
+const PROMPT = "miniDB >>"
+
+func main() {
+	user, err := user.Current()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("Hello " + user.Name + "!")
+	fmt.Println("This is the miniDB!")
+	fmt.Println("Feel free to type in commands")
+	Start()
+}
+
+func Start() {
+	scanner := bufio.NewScanner(os.Stdin)
+
+	for {
+		fmt.Print(PROMPT)
+		scanned := scanner.Scan()
+		if !scanned {
+			return
+		}
+
+		line := scanner.Text()
+		p := parser.New(lexer.New(line))
+		stmts, err := p.Parse()
+
+		if err != nil {
+			fmt.Println(err)
+			continue
+		}
+		fmt.Println(stmts)
+	}
+}
