chore: upgrade coredns version (#550)

vendor/github.com/expr-lang/expr/parser/lexer/token.go

@@ -0,0 +1,47 @@
+package lexer
+
+import (
+	"fmt"
+
+	"github.com/expr-lang/expr/file"
+)
+
+type Kind string
+
+const (
+	Identifier Kind = "Identifier"
+	Number     Kind = "Number"
+	String     Kind = "String"
+	Operator   Kind = "Operator"
+	Bracket    Kind = "Bracket"
+	EOF        Kind = "EOF"
+)
+
+type Token struct {
+	file.Location
+	Kind  Kind
+	Value string
+}
+
+func (t Token) String() string {
+	if t.Value == "" {
+		return string(t.Kind)
+	}
+	return fmt.Sprintf("%s(%#v)", t.Kind, t.Value)
+}
+
+func (t Token) Is(kind Kind, values ...string) bool {
+	if len(values) == 0 {
+		return kind == t.Kind
+	}
+
+	for _, v := range values {
+		if v == t.Value {
+			goto found
+		}
+	}
+	return false
+
+found:
+	return kind == t.Kind
+}