-
Notifications
You must be signed in to change notification settings - Fork 12
/
syntax.go
153 lines (126 loc) · 3.49 KB
/
syntax.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
package plugin
import (
"bytes"
"html"
"regexp"
"github.com/alecthomas/chroma"
chtml "github.com/alecthomas/chroma/formatters/html"
"github.com/alecthomas/chroma/lexers"
"github.com/alecthomas/chroma/styles"
"github.com/vito/booklit"
"github.com/vito/bass/pkg/hl"
)
// register Bass lexer
var _ = hl.BassLexer
func (plugin *Plugin) Syntax(language string, code booklit.Content) (booklit.Content, error) {
return plugin.SyntaxTransform(language, code, styles.Fallback)
}
const openNB = `">`
const closeSpan = `</span>`
var linkPattern = regexp.MustCompile(openNB + `([a-zA-Z!$&*_+=|<.>?\-;]+?)` + closeSpan)
// NB: this is a gross hack, but it works
func linkTransformer(sec *booklit.Section) Transformer {
return Transformer{
Pattern: linkPattern,
Transform: func(match string) booklit.Content {
open := match[:len(openNB)]
binding := html.UnescapeString(match[len(openNB) : len(match)-len(closeSpan)])
return booklit.Sequence{
booklit.Styled{
Style: "raw-html",
Content: booklit.String(open),
},
&booklit.Reference{
Section: sec,
TagName: "binding-" + binding,
Content: booklit.String(binding),
Optional: true,
},
booklit.Styled{
Style: "raw-html",
Content: booklit.String(closeSpan),
},
}
},
}
}
func (plugin *Plugin) Bass(code booklit.Content) (booklit.Content, error) {
return plugin.SyntaxTransform("bass", code, styles.Fallback)
}
func (plugin *Plugin) BassAutolink(code booklit.Content) (booklit.Content, error) {
return plugin.SyntaxTransform("bass", code, styles.Fallback, linkTransformer(plugin.Section))
}
type Transformer struct {
Pattern *regexp.Regexp
Transform func(string) booklit.Content
}
func (t Transformer) TransformAll(str string) booklit.Sequence {
matches := t.Pattern.FindAllStringIndex(str, -1)
out := booklit.Sequence{}
last := 0
for _, match := range matches {
if match[0] > last {
out = append(out, booklit.String(str[last:match[0]]))
}
out = append(out, t.Transform(str[match[0]:match[1]]))
last = match[1]
}
if len(str) > last {
out = append(out, booklit.String(str[last:]))
}
return out
}
func (plugin *Plugin) SyntaxTransform(language string, code booklit.Content, chromaStyle *chroma.Style, transformers ...Transformer) (booklit.Content, error) {
lexer := lexers.Get(language)
if lexer == nil {
lexer = lexers.Fallback
}
iterator, err := lexer.Tokenise(nil, code.String())
if err != nil {
return nil, err
}
formatter := chtml.New(
chtml.PreventSurroundingPre(code.IsFlow()),
chtml.WithClasses(true),
)
buf := new(bytes.Buffer)
err = formatter.Format(buf, chromaStyle, iterator)
if err != nil {
return nil, err
}
var style booklit.Style
if code.IsFlow() {
style = "code-flow"
} else {
style = "code-block"
}
highlighted := booklit.Sequence{booklit.String(buf.String())}
for _, t := range transformers {
var newHighlighted booklit.Sequence
for _, con := range highlighted {
switch val := con.(type) {
case booklit.String:
newHighlighted = append(newHighlighted, t.TransformAll(val.String())...)
default:
newHighlighted = append(newHighlighted, con)
}
}
highlighted = newHighlighted
}
for i, con := range highlighted {
if _, ok := con.(booklit.String); ok {
highlighted[i] = booklit.Styled{
Style: "raw-html",
Content: con,
}
}
}
return booklit.Styled{
Style: style,
Block: !code.IsFlow(),
Content: highlighted,
Partials: booklit.Partials{
"Language": booklit.String(language),
},
}, nil
}