feat: cmd

cmd/test/interpreter.go

@@ -0,0 +1,48 @@
+package cmd
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+
+	"github.com/0daryo/ody/evaluator"
+	"github.com/0daryo/ody/lexer"
+	"github.com/0daryo/ody/object"
+	"github.com/0daryo/ody/parser"
+)
+
+func Interprete() {
+	flag.Parse()
+	// ファイルをOpenする
+	f, err := os.Open(flag.Arg(0))
+	if err != nil {
+		fmt.Println("error")
+	}
+	defer f.Close()
+
+	// 一気に全部読み取り
+	b, err := ioutil.ReadAll(f)
+	// 出力
+	l := lexer.New(string(b))
+	p := parser.New(l)
+
+	program := p.ParseProgram()
+	out := os.Stdout
+	if len(p.Errors()) != 0 {
+		printParserErrors(out, p.Errors())
+	}
+	env := object.NewEnvironment()
+	evaluated := evaluator.Eval(program, env)
+	if evaluated != nil {
+		io.WriteString(out, evaluated.Inspect())
+		io.WriteString(out, "\n")
+	}
+}
+
+func printParserErrors(out io.Writer, errors []string) {
+	for _, msg := range errors {
+		io.WriteString(out, "\t"+msg+"\n")
+	}
+}

cmd/test/repl.go

@@ -0,0 +1,20 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"os/user"
+
+	"github.com/0daryo/ody/repl"
+)
+
+func Exec() {
+	user, err := user.Current()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("Hello %s! This is the ody programming language!\n",
+		user.Username)
+	fmt.Printf("Feel free to type in commands\n")
+	repl.Start(os.Stdin, os.Stdout)
+}