-
Notifications
You must be signed in to change notification settings - Fork 1
/
djinn.go
202 lines (167 loc) · 4.29 KB
/
djinn.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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
package djinn
import (
"fmt"
"html/template"
"io"
"regexp"
)
// The primary renderer, containing loaders, template functions, cache, & configuration.
type Djinn struct {
Configuration
*LoaderSet
*FuncSet
Cache
}
// Empty returns an empty Djinn with provided Config applied immediately.
func Empty(cnf ...Config) *Djinn {
d := &Djinn{
LoaderSet: NewLoaderSet(),
FuncSet: NewFuncSet(),
}
configure(d, cnf...)
d.Configuration = newConfiguration(d)
return d
}
// New provides a Djinn with default configuration.
func New(cnf ...Config) *Djinn {
d := Empty()
d.AddConfig(cnf...)
return d
}
// Render excutes the template specified by name, with the supplied writer and
// data. Template is searched for in the cache, if enabled, then from assembling
// the from the tempalte Djinn loaders. Returns any ocurring errors.
func (d *Djinn) Render(w io.Writer, name string, data interface{}) error {
if d.On() {
if tmpl, ok := d.Cache.Get(name); ok {
return tmpl.Execute(w, data)
}
}
tmpl, err := d.assemble(name)
if err != nil {
return err
}
if tmpl == nil {
return NilTemplateError(name)
}
return tmpl.Execute(w, data)
}
// Given a string name, Fetch attempts to get a *template.Template from cache
// or loaders, returning any error.
func (d *Djinn) Fetch(name string) (*template.Template, error) {
if d.On() {
if tmpl, ok := d.Cache.Get(name); ok {
return tmpl, nil
}
}
return d.assemble(name)
}
var (
reExtendsTag *regexp.Regexp = regexp.MustCompile("{{ extends [\"']?([^'\"}']*)[\"']? }}")
reIncludeTag *regexp.Regexp = regexp.MustCompile(`{{ include ["']?([^"]*)["']? }}`)
reDefineTag *regexp.Regexp = regexp.MustCompile("{{ ?define \"([^\"]*)\" ?\"?([a-zA-Z0-9]*)?\"? ?}}")
reTemplateTag *regexp.Regexp = regexp.MustCompile("{{ ?template \"([^\"]*)\" ?([^ ]*)? ?}}")
)
func (d *Djinn) assemble(name string) (*template.Template, error) {
stack := []*Node{}
err := d.add(&stack, name)
if err != nil {
return nil, err
}
blocks := map[string]string{}
blockId := 0
for _, node := range stack {
var errInReplace error = nil
node.Src = reIncludeTag.ReplaceAllStringFunc(node.Src, func(raw string) string {
parsed := reIncludeTag.FindStringSubmatch(raw)
templatePath := parsed[1]
subTpl, err := d.getTemplate(templatePath)
if err != nil {
errInReplace = err
return "[error]"
}
return subTpl
})
if errInReplace != nil {
return nil, errInReplace
}
}
for _, node := range stack {
node.Src = reDefineTag.ReplaceAllStringFunc(node.Src, func(raw string) string {
parsed := reDefineTag.FindStringSubmatch(raw)
blockName := fmt.Sprintf("BLOCK_%d", blockId)
blocks[parsed[1]] = blockName
blockId += 1
return "{{ define \"" + blockName + "\" }}"
})
}
var rootTemplate *template.Template
for i, node := range stack {
node.Src = reTemplateTag.ReplaceAllStringFunc(node.Src, func(raw string) string {
parsed := reTemplateTag.FindStringSubmatch(raw)
origName := parsed[1]
replacedName, ok := blocks[origName]
dot := "."
if len(parsed) == 3 && len(parsed[2]) > 0 {
dot = parsed[2]
}
if ok {
return fmt.Sprintf(`{{ template "%s" %s }}`, replacedName, dot)
} else {
return ""
}
})
var thisTemplate *template.Template
if i == 0 {
thisTemplate = template.New(node.Name)
rootTemplate = thisTemplate
} else {
thisTemplate = rootTemplate.New(node.Name)
}
thisTemplate.Funcs(d.GetFuncs())
_, err := thisTemplate.Parse(node.Src)
if err != nil {
return nil, err
}
}
if d.On() {
d.Cache.Add(name, rootTemplate)
}
return rootTemplate, nil
}
func (d *Djinn) getTemplate(name string) (string, error) {
for _, l := range d.GetLoaders() {
t, err := l.Load(name)
if err == nil {
return t, nil
}
}
return "", NoTemplateError(name)
}
type Node struct {
Name string
Src string
}
func (d *Djinn) add(stack *[]*Node, name string) error {
tplSrc, err := d.getTemplate(name)
if err != nil {
return err
}
if len(tplSrc) < 1 {
return EmptyTemplateError(name)
}
extendsMatches := reExtendsTag.FindStringSubmatch(tplSrc)
if len(extendsMatches) == 2 {
err := d.add(stack, extendsMatches[1])
if err != nil {
return err
}
tplSrc = reExtendsTag.ReplaceAllString(tplSrc, "")
}
node := &Node{
Name: name,
Src: tplSrc,
}
*stack = append((*stack), node)
return nil
}