rearrange builtins

builtins/builtins.go

@@ -0,0 +1,53 @@
+package builtins
+
+import (
+	"fmt"
+	"monkey/object"
+	"sort"
+)
+
+// Builtins ...
+var Builtins = map[string]*object.Builtin{
+	"len":    {Name: "len", Fn: Len},
+	"input":  {Name: "input", Fn: Input},
+	"print":  {Name: "print", Fn: Print},
+	"first":  {Name: "first", Fn: First},
+	"last":   {Name: "last", Fn: Last},
+	"rest":   {Name: "rest", Fn: Rest},
+	"push":   {Name: "push", Fn: Push},
+	"pop":    {Name: "pop", Fn: Pop},
+	"exit":   {Name: "exit", Fn: Exit},
+	"assert": {Name: "assert", Fn: Assert},
+	"bool":   {Name: "bool", Fn: Bool},
+	"int":    {Name: "int", Fn: Int},
+	"str":    {Name: "str", Fn: Str},
+	"type":   {Name: "type", Fn: TypeOf},
+	"args":   {Name: "args", Fn: Args},
+	"lower":  {Name: "lower", Fn: Lower},
+	"upper":  {Name: "upper", Fn: Upper},
+	"join":   {Name: "join", Fn: Join},
+	"split":  {Name: "split", Fn: Split},
+	"find":   {Name: "find", Fn: Find},
+	"read":   {Name: "read", Fn: Read},
+	"write":  {Name: "write", Fn: Write},
+	"ffi":    {Name: "ffi", Fn: FFI},
+}
+
+// BuiltinsIndex ...
+var BuiltinsIndex []*object.Builtin
+
+func init() {
+	var keys []string
+	for k := range Builtins {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+
+	for _, k := range keys {
+		BuiltinsIndex = append(BuiltinsIndex, Builtins[k])
+	}
+}
+
+func newError(format string, a ...interface{}) *object.Error {
+	return &object.Error{Message: fmt.Sprintf(format, a...)}
+}