mirror of
https://github.com/minio/minio.git
synced 2025-10-31 08:11:19 +01:00
130 lines
3.4 KiB
Go
130 lines
3.4 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
|
|
//
|
|
// This file is part of MinIO Object Storage stack
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package sql
|
|
|
|
import (
|
|
"errors"
|
|
|
|
"github.com/bcicen/jstream"
|
|
"github.com/minio/simdjson-go"
|
|
)
|
|
|
|
var (
|
|
errKeyLookup = errors.New("Cannot look up key in non-object value")
|
|
errIndexLookup = errors.New("Cannot look up array index in non-array value")
|
|
errWildcardObjectLookup = errors.New("Object wildcard used on non-object value")
|
|
errWildcardArrayLookup = errors.New("Array wildcard used on non-array value")
|
|
errWildcardObjectUsageInvalid = errors.New("Invalid usage of object wildcard")
|
|
)
|
|
|
|
// jsonpathEval evaluates a JSON path and returns the value at the path.
|
|
// If the value should be considered flat (from wildcards) any array returned should be considered individual values.
|
|
func jsonpathEval(p []*JSONPathElement, v interface{}) (r interface{}, flat bool, err error) {
|
|
// fmt.Printf("JPATHexpr: %v jsonobj: %v\n\n", p, v)
|
|
if len(p) == 0 || v == nil {
|
|
return v, false, nil
|
|
}
|
|
|
|
switch {
|
|
case p[0].Key != nil:
|
|
key := p[0].Key.keyString()
|
|
|
|
switch kvs := v.(type) {
|
|
case jstream.KVS:
|
|
for _, kv := range kvs {
|
|
if kv.Key == key {
|
|
return jsonpathEval(p[1:], kv.Value)
|
|
}
|
|
}
|
|
// Key not found - return nil result
|
|
return Missing{}, false, nil
|
|
case simdjson.Object:
|
|
elem := kvs.FindKey(key, nil)
|
|
if elem == nil {
|
|
// Key not found - return nil result
|
|
return Missing{}, false, nil
|
|
}
|
|
val, err := IterToValue(elem.Iter)
|
|
if err != nil {
|
|
return nil, false, err
|
|
}
|
|
return jsonpathEval(p[1:], val)
|
|
default:
|
|
return nil, false, errKeyLookup
|
|
}
|
|
|
|
case p[0].Index != nil:
|
|
idx := *p[0].Index
|
|
|
|
arr, ok := v.([]interface{})
|
|
if !ok {
|
|
return nil, false, errIndexLookup
|
|
}
|
|
|
|
if idx >= len(arr) {
|
|
return nil, false, nil
|
|
}
|
|
return jsonpathEval(p[1:], arr[idx])
|
|
|
|
case p[0].ObjectWildcard:
|
|
switch kvs := v.(type) {
|
|
case jstream.KVS:
|
|
if len(p[1:]) > 0 {
|
|
return nil, false, errWildcardObjectUsageInvalid
|
|
}
|
|
|
|
return kvs, false, nil
|
|
case simdjson.Object:
|
|
if len(p[1:]) > 0 {
|
|
return nil, false, errWildcardObjectUsageInvalid
|
|
}
|
|
|
|
return kvs, false, nil
|
|
default:
|
|
return nil, false, errWildcardObjectLookup
|
|
}
|
|
|
|
case p[0].ArrayWildcard:
|
|
arr, ok := v.([]interface{})
|
|
if !ok {
|
|
return nil, false, errWildcardArrayLookup
|
|
}
|
|
|
|
// Lookup remainder of path in each array element and
|
|
// make result array.
|
|
var result []interface{}
|
|
for _, a := range arr {
|
|
rval, flatten, err := jsonpathEval(p[1:], a)
|
|
if err != nil {
|
|
return nil, false, err
|
|
}
|
|
|
|
if flatten {
|
|
// Flatten if array.
|
|
if arr, ok := rval.([]interface{}); ok {
|
|
result = append(result, arr...)
|
|
continue
|
|
}
|
|
}
|
|
result = append(result, rval)
|
|
}
|
|
return result, true, nil
|
|
}
|
|
panic("cannot reach here")
|
|
}
|