switch to go vendoring

vendor/github.com/open-policy-agent/opa/internal/gqlparser/ast/path.go

@@ -0,0 +1,67 @@
+package ast
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+)
+
+var _ json.Unmarshaler = (*Path)(nil)
+
+type Path []PathElement
+
+type PathElement interface {
+	isPathElement()
+}
+
+var _ PathElement = PathIndex(0)
+var _ PathElement = PathName("")
+
+func (path Path) String() string {
+	var str bytes.Buffer
+	for i, v := range path {
+		switch v := v.(type) {
+		case PathIndex:
+			str.WriteString(fmt.Sprintf("[%d]", v))
+		case PathName:
+			if i != 0 {
+				str.WriteByte('.')
+			}
+			str.WriteString(string(v))
+		default:
+			panic(fmt.Sprintf("unknown type: %T", v))
+		}
+	}
+	return str.String()
+}
+
+func (path *Path) UnmarshalJSON(b []byte) error {
+	var vs []interface{}
+	err := json.Unmarshal(b, &vs)
+	if err != nil {
+		return err
+	}
+
+	*path = make([]PathElement, 0, len(vs))
+	for _, v := range vs {
+		switch v := v.(type) {
+		case string:
+			*path = append(*path, PathName(v))
+		case int:
+			*path = append(*path, PathIndex(v))
+		case float64:
+			*path = append(*path, PathIndex(int(v)))
+		default:
+			return fmt.Errorf("unknown path element type: %T", v)
+		}
+	}
+	return nil
+}
+
+type PathIndex int
+
+func (PathIndex) isPathElement() {}
+
+type PathName string
+
+func (PathName) isPathElement() {}