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1 package parser
2
3 import (
4 "github.com/yuin/goldmark/ast"
5 "github.com/yuin/goldmark/text"
6 "github.com/yuin/goldmark/util"
7 )
8
9
10 type HeadingConfig struct {
11 AutoHeadingID bool
12 Attribute bool
13 }
14
15
16 func (b *HeadingConfig) SetOption(name OptionName, value interface{}) {
17 switch name {
18 case optAutoHeadingID:
19 b.AutoHeadingID = true
20 case optAttribute:
21 b.Attribute = true
22 }
23 }
24
25
26 type HeadingOption interface {
27 Option
28 SetHeadingOption(*HeadingConfig)
29 }
30
31
32 const optAutoHeadingID OptionName = "AutoHeadingID"
33
34 type withAutoHeadingID struct {
35 }
36
37 func (o *withAutoHeadingID) SetParserOption(c *Config) {
38 c.Options[optAutoHeadingID] = true
39 }
40
41 func (o *withAutoHeadingID) SetHeadingOption(p *HeadingConfig) {
42 p.AutoHeadingID = true
43 }
44
45
46
47 func WithAutoHeadingID() HeadingOption {
48 return &withAutoHeadingID{}
49 }
50
51 type withHeadingAttribute struct {
52 Option
53 }
54
55 func (o *withHeadingAttribute) SetHeadingOption(p *HeadingConfig) {
56 p.Attribute = true
57 }
58
59
60 func WithHeadingAttribute() HeadingOption {
61 return &withHeadingAttribute{WithAttribute()}
62 }
63
64 type atxHeadingParser struct {
65 HeadingConfig
66 }
67
68
69 func NewATXHeadingParser(opts ...HeadingOption) BlockParser {
70 p := &atxHeadingParser{}
71 for _, o := range opts {
72 o.SetHeadingOption(&p.HeadingConfig)
73 }
74 return p
75 }
76
77 func (b *atxHeadingParser) Trigger() []byte {
78 return []byte{'#'}
79 }
80
81 func (b *atxHeadingParser) Open(parent ast.Node, reader text.Reader, pc Context) (ast.Node, State) {
82 line, segment := reader.PeekLine()
83 pos := pc.BlockOffset()
84 if pos < 0 {
85 return nil, NoChildren
86 }
87 i := pos
88 for ; i < len(line) && line[i] == '#'; i++ {
89 }
90 level := i - pos
91 if i == pos || level > 6 {
92 return nil, NoChildren
93 }
94 if i == len(line) {
95 return ast.NewHeading(level), NoChildren
96 }
97 l := util.TrimLeftSpaceLength(line[i:])
98 if l == 0 {
99 return nil, NoChildren
100 }
101 start := i + l
102 if start >= len(line) {
103 start = len(line) - 1
104 }
105 origstart := start
106 stop := len(line) - util.TrimRightSpaceLength(line)
107
108 node := ast.NewHeading(level)
109 parsed := false
110 if b.Attribute {
111 start--
112 closureClose := -1
113 closureOpen := -1
114 for j := start; j < stop; {
115 c := line[j]
116 if util.IsEscapedPunctuation(line, j) {
117 j += 2
118 } else if util.IsSpace(c) && j < stop-1 && line[j+1] == '#' {
119 closureOpen = j + 1
120 k := j + 1
121 for ; k < stop && line[k] == '#'; k++ {
122 }
123 closureClose = k
124 break
125 } else {
126 j++
127 }
128 }
129 if closureClose > 0 {
130 reader.Advance(closureClose)
131 attrs, ok := ParseAttributes(reader)
132 rest, _ := reader.PeekLine()
133 parsed = ok && util.IsBlank(rest)
134 if parsed {
135 for _, attr := range attrs {
136 node.SetAttribute(attr.Name, attr.Value)
137 }
138 node.Lines().Append(text.NewSegment(segment.Start+start+1-segment.Padding, segment.Start+closureOpen-segment.Padding))
139 }
140 }
141 }
142 if !parsed {
143 start = origstart
144 stop := len(line) - util.TrimRightSpaceLength(line)
145 if stop <= start {
146 stop = start
147 } else {
148 i = stop - 1
149 for ; line[i] == '#' && i >= start; i-- {
150 }
151 if i != stop-1 && !util.IsSpace(line[i]) {
152 i = stop - 1
153 }
154 i++
155 stop = i
156 }
157
158 if len(util.TrimRight(line[start:stop], []byte{'#'})) != 0 {
159 node.Lines().Append(text.NewSegment(segment.Start+start-segment.Padding, segment.Start+stop-segment.Padding))
160 }
161 }
162 return node, NoChildren
163 }
164
165 func (b *atxHeadingParser) Continue(node ast.Node, reader text.Reader, pc Context) State {
166 return Close
167 }
168
169 func (b *atxHeadingParser) Close(node ast.Node, reader text.Reader, pc Context) {
170 if b.Attribute {
171 _, ok := node.AttributeString("id")
172 if !ok {
173 parseLastLineAttributes(node, reader, pc)
174 }
175 }
176
177 if b.AutoHeadingID {
178 id, ok := node.AttributeString("id")
179 if !ok {
180 generateAutoHeadingID(node.(*ast.Heading), reader, pc)
181 } else {
182 pc.IDs().Put(id.([]byte))
183 }
184 }
185 }
186
187 func (b *atxHeadingParser) CanInterruptParagraph() bool {
188 return true
189 }
190
191 func (b *atxHeadingParser) CanAcceptIndentedLine() bool {
192 return false
193 }
194
195 func generateAutoHeadingID(node *ast.Heading, reader text.Reader, pc Context) {
196 var line []byte
197 lastIndex := node.Lines().Len() - 1
198 if lastIndex > -1 {
199 lastLine := node.Lines().At(lastIndex)
200 line = lastLine.Value(reader.Source())
201 }
202 headingID := pc.IDs().Generate(line, ast.KindHeading)
203 node.SetAttribute(attrNameID, headingID)
204 }
205
206 func parseLastLineAttributes(node ast.Node, reader text.Reader, pc Context) {
207 lastIndex := node.Lines().Len() - 1
208 if lastIndex < 0 {
209 return
210 }
211 lastLine := node.Lines().At(lastIndex)
212 line := lastLine.Value(reader.Source())
213 lr := text.NewReader(line)
214 var attrs Attributes
215 var ok bool
216 var start text.Segment
217 var sl int
218 var end text.Segment
219 for {
220 c := lr.Peek()
221 if c == text.EOF {
222 break
223 }
224 if c == '\\' {
225 lr.Advance(1)
226 if lr.Peek() == '{' {
227 lr.Advance(1)
228 }
229 continue
230 }
231 if c == '{' {
232 sl, start = lr.Position()
233 attrs, ok = ParseAttributes(lr)
234 _, end = lr.Position()
235 lr.SetPosition(sl, start)
236 }
237 lr.Advance(1)
238 }
239 if ok && util.IsBlank(line[end.Start:]) {
240 for _, attr := range attrs {
241 node.SetAttribute(attr.Name, attr.Value)
242 }
243 lastLine.Stop = lastLine.Start + start.Start
244 node.Lines().Set(lastIndex, lastLine)
245 }
246 }
247
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