forked from savaki/go-giter8
/
template.go
106 lines (89 loc) · 3.3 KB
/
template.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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
// The MIT License (MIT)
//
// Copyright (c) 2014 Matt Ho
//
// 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 template
import (
"bytes"
"fmt"
"regexp"
text_template "text/template"
)
var (
// $name__filter1__filter2$
shortFormat = regexp.MustCompile(`\$(([a-zA-Z0-9](_[a-zA-Z0-9]+)*)+(__[a-zA-Z0-9]+)*)\$`)
// $name;format="filter1,filter2"$
longFormat = regexp.MustCompile(`\$((\w+);format="([^"]+)")\$`)
)
const (
leftDelim = "{\000{"
rightDelim = "}\000}"
)
// converts data on the other end of the reader to a golang template
func Parse(text []byte) (*text_template.Template, error) {
text = transform(text)
return text_template.New("template").Funcs(funcMap).Delims(leftDelim, rightDelim).Parse(string(text))
}
func Render(text []byte, data interface{}) ([]byte, error) {
t, err := Parse(text)
if err != nil {
return nil, err
}
buffer := bytes.NewBuffer([]byte{})
err = t.Execute(buffer, data)
if err != nil {
return nil, err
}
return buffer.Bytes(), nil
}
// transform templates in the short format to go templates e.g. name__filter1__filter2
func transformShort(text []byte) []byte {
results := text
matches := shortFormat.FindAllSubmatch(results, -1)
for _, match := range matches {
segments := bytes.Split(match[1], []byte("__"))
// macro := fmt.Sprintf("{{ .%s }}", bytes.Join(segments, []byte(" | ")))
macro := fmt.Sprintf(leftDelim+" .%s "+rightDelim, bytes.Join(segments, []byte(" | ")))
results = bytes.Replace(results, match[0], []byte(macro), -1)
}
return results
}
// transform templates in the long format to go templates e.g. name;filter="lower,snake"
func transformLong(text []byte) []byte {
results := text
matches := longFormat.FindAllSubmatch(results, -1)
for _, match := range matches {
field := match[2]
filters := match[3]
segments := [][]byte{field}
segments = append(segments, bytes.Split(filters, []byte(","))...)
// macro := fmt.Sprintf("{{ .%s }}", bytes.Join(segments, []byte(" | ")))
macro := fmt.Sprintf(leftDelim+" .%s "+rightDelim, bytes.Join(segments, []byte(" | ")))
results = bytes.Replace(results, match[0], []byte(macro), -1)
}
return results
}
// helper to combine both short and long transforms
func transform(text []byte) []byte {
text = giter8ify(text)
text = transformShort(text)
text = transformLong(text)
return text
}