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
|
// Copyright 2024 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package codeblocks
import (
"bytes"
"errors"
"fmt"
"strings"
"github.com/gohugoio/hugo/common/herrors"
htext "github.com/gohugoio/hugo/common/text"
"github.com/gohugoio/hugo/markup/converter/hooks"
"github.com/gohugoio/hugo/markup/goldmark/internal/render"
"github.com/gohugoio/hugo/markup/highlight/chromalexers"
"github.com/gohugoio/hugo/markup/internal/attributes"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/parser"
"github.com/yuin/goldmark/renderer"
"github.com/yuin/goldmark/text"
"github.com/yuin/goldmark/util"
)
type (
codeBlocksExtension struct{}
htmlRenderer struct{}
)
func New() goldmark.Extender {
return &codeBlocksExtension{}
}
func (e *codeBlocksExtension) Extend(m goldmark.Markdown) {
m.Renderer().AddOptions(renderer.WithNodeRenderers(
util.Prioritized(newHTMLRenderer(), 100),
))
}
func newHTMLRenderer() renderer.NodeRenderer {
r := &htmlRenderer{}
return r
}
func (r *htmlRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
reg.Register(ast.KindFencedCodeBlock, r.renderCodeBlock)
}
func (r *htmlRenderer) renderCodeBlock(w util.BufWriter, src []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
ctx := w.(*render.Context)
if entering {
return ast.WalkContinue, nil
}
n := node.(*ast.FencedCodeBlock)
lang := getLang(n, src)
renderer := ctx.RenderContext().GetRenderer(hooks.CodeBlockRendererType, lang)
if renderer == nil {
return ast.WalkStop, fmt.Errorf("no code renderer found for %q", lang)
}
ordinal := ctx.GetAndIncrementOrdinal(ast.KindFencedCodeBlock)
var buff bytes.Buffer
l := n.Lines().Len()
for i := range l {
line := n.Lines().At(i)
buff.Write(line.Value(src))
}
s := htext.Chomp(buff.String())
var info []byte
if n.Info != nil {
info = n.Info.Segment.Value(src)
}
attrtp := attributes.AttributesOwnerCodeBlockCustom
if isd, ok := renderer.(hooks.IsDefaultCodeBlockRendererProvider); (ok && isd.IsDefaultCodeBlockRenderer()) || chromalexers.Get(lang) != nil {
// We say that this is a Chroma code block if it's the default code block renderer
// or if the language is supported by Chroma.
attrtp = attributes.AttributesOwnerCodeBlockChroma
}
attrs, attrStr, err := getAttributes(n, info)
if err != nil {
return ast.WalkStop, &herrors.TextSegmentError{Err: err, Segment: attrStr}
}
cbctx := &codeBlockContext{
BaseContext: render.NewBaseContext(ctx, renderer, node, src, func() []byte { return []byte(s) }, ordinal),
lang: lang,
code: s,
AttributesHolder: attributes.New(attrs, attrtp),
}
cr := renderer.(hooks.CodeBlockRenderer)
err = cr.RenderCodeblock(
ctx.RenderContext().Ctx,
w,
cbctx,
)
if err != nil {
return ast.WalkContinue, herrors.NewFileErrorFromPos(err, cbctx.Position())
}
return ast.WalkContinue, nil
}
type codeBlockContext struct {
hooks.BaseContext
lang string
code string
*attributes.AttributesHolder
}
func (c *codeBlockContext) Type() string {
return c.lang
}
func (c *codeBlockContext) Inner() string {
return c.code
}
func getLang(node *ast.FencedCodeBlock, src []byte) string {
langWithAttributes := string(node.Language(src))
lang, _, _ := strings.Cut(langWithAttributes, "{")
return lang
}
func getAttributes(node *ast.FencedCodeBlock, infostr []byte) ([]ast.Attribute, string, error) {
if node.Attributes() != nil {
return node.Attributes(), "", nil
}
if infostr != nil {
attrStartIdx := -1
attrEndIdx := -1
for idx, char := range infostr {
if attrEndIdx == -1 && char == '{' {
attrStartIdx = idx
}
if attrStartIdx != -1 && char == '}' {
attrEndIdx = idx
break
}
}
if attrStartIdx != -1 && attrEndIdx != -1 {
n := ast.NewTextBlock() // dummy node for storing attributes
attrStr := infostr[attrStartIdx : attrEndIdx+1]
if attrs, hasAttr := parser.ParseAttributes(text.NewReader(attrStr)); hasAttr {
for _, attr := range attrs {
n.SetAttribute(attr.Name, attr.Value)
}
return n.Attributes(), "", nil
} else {
return nil, string(attrStr), errors.New("failed to parse Markdown attributes; you may need to quote the values")
}
}
}
return nil, "", nil
}
|
