forked from uber/prototool
/
transformer.go
90 lines (79 loc) · 2.67 KB
/
transformer.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
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package format
import (
"bytes"
"fmt"
"strings"
"github.com/emicklei/proto"
"github.com/uber/prototool/internal/text"
"go.uber.org/zap"
)
type transformer struct {
logger *zap.Logger
fix bool
}
func newTransformer(options ...TransformerOption) *transformer {
transformer := &transformer{
logger: zap.NewNop(),
}
for _, option := range options {
option(transformer)
}
return transformer
}
func (t *transformer) Transform(filename string, data []byte) ([]byte, []*text.Failure, error) {
descriptor, err := proto.NewParser(bytes.NewReader(data)).Parse()
if err != nil {
return nil, nil, err
}
descriptor.Filename = filename
firstPassVisitor := newFirstPassVisitor(filename, t.fix)
for _, element := range descriptor.Elements {
element.Accept(firstPassVisitor)
}
failures := firstPassVisitor.Do()
buffer := bytes.NewBuffer(nil)
buffer.Write(firstPassVisitor.Bytes())
syntaxVersion := 2
if firstPassVisitor.Syntax != nil && firstPassVisitor.Syntax.Value != "" {
switch firstPassVisitor.Syntax.Value {
case "proto2":
// nothing
case "proto3":
syntaxVersion = 3
default:
return nil, nil, fmt.Errorf("unknown syntax: %s", firstPassVisitor.Syntax.Value)
}
}
mainVisitor := newMainVisitor(syntaxVersion == 2)
for _, element := range descriptor.Elements {
element.Accept(mainVisitor)
}
failures = append(failures, mainVisitor.Do()...)
buffer.Write(mainVisitor.Bytes())
text.SortFailures(failures)
// TODO: expensive
s := strings.TrimSpace(buffer.String())
if len(s) > 0 {
return []byte(s + "\n"), failures, nil
}
return nil, failures, nil
}