-
Notifications
You must be signed in to change notification settings - Fork 170
/
renderer.go
168 lines (144 loc) Β· 4.51 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
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
package ansi
import (
"io"
"net/url"
"strings"
"github.com/muesli/termenv"
east "github.com/yuin/goldmark-emoji/ast"
"github.com/yuin/goldmark/ast"
astext "github.com/yuin/goldmark/extension/ast"
"github.com/yuin/goldmark/renderer"
"github.com/yuin/goldmark/util"
)
// Options is used to configure an ANSIRenderer.
type Options struct {
BaseURL string
WordWrap int
PreserveNewLines bool
ColorProfile termenv.Profile
Styles StyleConfig
}
// ANSIRenderer renders markdown content as ANSI escaped sequences.
type ANSIRenderer struct {
context RenderContext
}
// NewRenderer returns a new ANSIRenderer with style and options set.
func NewRenderer(options Options) *ANSIRenderer {
return &ANSIRenderer{
context: NewRenderContext(options),
}
}
// RegisterFuncs implements NodeRenderer.RegisterFuncs.
func (r *ANSIRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
// blocks
reg.Register(ast.KindDocument, r.renderNode)
reg.Register(ast.KindHeading, r.renderNode)
reg.Register(ast.KindBlockquote, r.renderNode)
reg.Register(ast.KindCodeBlock, r.renderNode)
reg.Register(ast.KindFencedCodeBlock, r.renderNode)
reg.Register(ast.KindHTMLBlock, r.renderNode)
reg.Register(ast.KindList, r.renderNode)
reg.Register(ast.KindListItem, r.renderNode)
reg.Register(ast.KindParagraph, r.renderNode)
reg.Register(ast.KindTextBlock, r.renderNode)
reg.Register(ast.KindThematicBreak, r.renderNode)
// inlines
reg.Register(ast.KindAutoLink, r.renderNode)
reg.Register(ast.KindCodeSpan, r.renderNode)
reg.Register(ast.KindEmphasis, r.renderNode)
reg.Register(ast.KindImage, r.renderNode)
reg.Register(ast.KindLink, r.renderNode)
reg.Register(ast.KindRawHTML, r.renderNode)
reg.Register(ast.KindText, r.renderNode)
reg.Register(ast.KindString, r.renderNode)
// tables
reg.Register(astext.KindTable, r.renderNode)
reg.Register(astext.KindTableHeader, r.renderNode)
reg.Register(astext.KindTableRow, r.renderNode)
reg.Register(astext.KindTableCell, r.renderNode)
// definitions
reg.Register(astext.KindDefinitionList, r.renderNode)
reg.Register(astext.KindDefinitionTerm, r.renderNode)
reg.Register(astext.KindDefinitionDescription, r.renderNode)
// footnotes
reg.Register(astext.KindFootnote, r.renderNode)
reg.Register(astext.KindFootnoteList, r.renderNode)
reg.Register(astext.KindFootnoteLink, r.renderNode)
reg.Register(astext.KindFootnoteBacklink, r.renderNode)
// checkboxes
reg.Register(astext.KindTaskCheckBox, r.renderNode)
// strikethrough
reg.Register(astext.KindStrikethrough, r.renderNode)
// emoji
reg.Register(east.KindEmoji, r.renderNode)
}
func (r *ANSIRenderer) renderNode(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
// _, _ = w.Write([]byte(node.Type.String()))
writeTo := io.Writer(w)
bs := r.context.blockStack
// children get rendered by their parent
if isChild(node) {
return ast.WalkContinue, nil
}
e := r.NewElement(node, source)
if entering {
// everything below the Document element gets rendered into a block buffer
if bs.Len() > 0 {
writeTo = io.Writer(bs.Current().Block)
}
_, _ = writeTo.Write([]byte(e.Entering))
if e.Renderer != nil {
err := e.Renderer.Render(writeTo, r.context)
if err != nil {
return ast.WalkStop, err
}
}
} else {
// everything below the Document element gets rendered into a block buffer
if bs.Len() > 0 {
writeTo = io.Writer(bs.Parent().Block)
}
// if we're finished rendering the entire document,
// flush to the real writer
if node.Type() == ast.TypeDocument {
writeTo = w
}
if e.Finisher != nil {
err := e.Finisher.Finish(writeTo, r.context)
if err != nil {
return ast.WalkStop, err
}
}
_, _ = bs.Current().Block.Write([]byte(e.Exiting))
}
return ast.WalkContinue, nil
}
func isChild(node ast.Node) bool {
if node.Parent() != nil && node.Parent().Kind() == ast.KindBlockquote {
// skip paragraph within blockquote to avoid reflowing text
return true
}
for n := node.Parent(); n != nil; n = n.Parent() {
// These types are already rendered by their parent
switch n.Kind() {
case ast.KindLink, ast.KindImage, ast.KindEmphasis, astext.KindStrikethrough, astext.KindTableCell:
return true
}
}
return false
}
func resolveRelativeURL(baseURL string, rel string) string {
u, err := url.Parse(rel)
if err != nil {
return rel
}
if u.IsAbs() {
return rel
}
u.Path = strings.TrimPrefix(u.Path, "/")
base, err := url.Parse(baseURL)
if err != nil {
return rel
}
return base.ResolveReference(u).String()
}