-
Notifications
You must be signed in to change notification settings - Fork 11
/
renderer.go
88 lines (69 loc) · 1.73 KB
/
renderer.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
package css
import (
"bytes"
"fmt"
"sort"
"qlova.org/seed"
)
type Renderer func(root seed.Seed) []byte
var renderers []Renderer
func RegisterRenderer(r Renderer) {
renderers = append(renderers, r)
}
func render(c seed.Seed, tracker map[string]struct{}) []byte {
var b bytes.Buffer
var data data
c.Load(&data)
if data.rules != nil && data.rules.Len() > 0 {
fmt.Fprintf(&b, "\n%v {\n", Selector(c))
for pair := data.rules.Oldest(); pair != nil; pair = pair.Next() {
property, value := pair.Key, pair.Value
fmt.Fprintf(&b, "\t%v: %v;", property, value)
}
fmt.Fprint(&b, "}\n")
}
if len(data.queries) > 0 {
//Deterministic render.
keys := make([]string, 0, len(data.queries))
for i := range data.queries {
keys = append(keys, string(i))
}
sort.Strings(keys)
for _, query := range keys {
fmt.Fprintf(&b, "\n%v%v {\n", Selector(c), query)
for _, rule := range data.queries[query] {
property, value := rule.Split()
fmt.Fprintf(&b, "\t%v: %v;", property, value)
}
fmt.Fprint(&b, "}\n")
}
}
//harvest sheets.
if len(data.sheets) > 0 {
//Deterministic render.
keys := make([]string, 0, len(data.sheets))
for i := range data.sheets {
keys = append(keys, string(i))
}
sort.Strings(keys)
for _, sheet := range keys {
if _, ok := tracker[sheet]; !ok {
tracker[sheet] = struct{}{}
b.WriteString(sheet)
}
}
}
for _, child := range c.Children() {
b.Write(render(child, tracker))
}
return b.Bytes()
}
//Render renders a css document from the given seed as the root element.
func Render(root seed.Seed) []byte {
var b bytes.Buffer
b.Write(render(root, make(map[string]struct{})))
for _, renderer := range renderers {
b.Write(renderer(root))
}
return b.Bytes()
}