-
Notifications
You must be signed in to change notification settings - Fork 1
/
nested.go
67 lines (61 loc) · 1.69 KB
/
nested.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
// Licensed to ClickHouse, Inc. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. ClickHouse, Inc. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package column
import (
"fmt"
"strings"
)
type Nested struct {
Interface
}
func (col *Nested) parse(t Type) (_ Interface, err error) {
columns := fmt.Sprintf("array(tuple(%s))", strings.Join(nestedColumns(t.params()), ", "))
if col.Interface, err = (&Array{}).parse(Type(columns)); err != nil {
return nil, err
}
return col, nil
}
func nestedColumns(raw string) (columns []string) {
var (
begin int
brackets int
)
for i, r := range raw + "," {
switch r {
case '(':
brackets++
case ')':
brackets--
case ' ':
if brackets == 0 {
begin = i + 1
}
case ',':
if brackets == 0 {
columns, begin = append(columns, raw[begin:i]), i+1
continue
}
}
}
for i, column := range columns {
if strings.HasPrefix(column, "nested(") {
columns[i] = fmt.Sprintf("array(tuple(%s))", strings.Join(nestedColumns(Type(column).params()), ", "))
}
}
return
}
var _ Interface = (*Nested)(nil)