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
|
// Copyright 2019 CUE Authors
//
// Licensed 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 source contains utility functions that standardize reading source
// bytes across cue packages.
package source
import (
"bytes"
"fmt"
"io"
"os"
"strings"
)
// ReadAll loads the source bytes for the given arguments. If src != nil,
// ReadAll converts src to a []byte if possible; otherwise it returns an
// error. If src == nil, ReadAll returns the result of reading the file
// specified by filename.
func ReadAll(filename string, src any) ([]byte, error) {
if src != nil {
switch src := src.(type) {
case string:
return []byte(src), nil
case []byte:
return src, nil
case *bytes.Buffer:
// is io.Reader, but src is already available in []byte form
if src != nil {
return src.Bytes(), nil
}
case io.Reader:
var buf bytes.Buffer
if _, err := io.Copy(&buf, src); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
return nil, fmt.Errorf("invalid source type %T", src)
}
return os.ReadFile(filename)
}
// Open creates a source reader for the given arguments. If src != nil,
// Open converts src to an io.Open if possible; otherwise it returns an
// error. If src == nil, Open returns the result of opening the file
// specified by filename.
func Open(filename string, src any) (io.ReadCloser, error) {
if src != nil {
switch src := src.(type) {
case string:
return io.NopCloser(strings.NewReader(src)), nil
case []byte:
return io.NopCloser(bytes.NewReader(src)), nil
case io.Reader:
return io.NopCloser(src), nil
}
return nil, fmt.Errorf("invalid source type %T", src)
}
return os.Open(filename)
}
|
