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