restructure project

internal/builtins/input.go

@@ -0,0 +1,34 @@
+package builtins
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"monkey/internal/object"
+	"monkey/internal/typing"
+	"os"
+)
+
+// Input ...
+func Input(args ...object.Object) object.Object {
+	if err := typing.Check(
+		"input", args,
+		typing.RangeOfArgs(0, 1),
+		typing.WithTypes(object.STRING_OBJ),
+	); err != nil {
+		return newError(err.Error())
+	}
+
+	if len(args) == 1 {
+		prompt := args[0].(*object.String).Value
+		fmt.Fprintf(os.Stdout, prompt)
+	}
+
+	buffer := bufio.NewReader(os.Stdin)
+
+	line, _, err := buffer.ReadLine()
+	if err != nil && err != io.EOF {
+		return newError(fmt.Sprintf("error reading input from stdin: %s", err))
+	}
+	return &object.String{Value: string(line)}
+}