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
|
package gemtext
import (
"bufio"
"bytes"
"io"
)
// Parse parses the full contents of an io.Reader into a gemtext.Document.
func Parse(input io.Reader) (Document, error) {
rdr := bufio.NewReader(input)
var lines []Line
inPFT := false
for {
raw, err := rdr.ReadBytes('\n')
if err != io.EOF && err != nil {
return nil, err
}
var line Line
if inPFT && (len(raw) < 3 || raw[0] != '`' || raw[1] != '`' || raw[2] != '`') {
line = PreformattedTextLine{raw: raw}
} else {
line = ParseLine(raw)
}
if line.Type() == LineTypePreformatToggle {
if inPFT {
toggle := line.(PreformatToggleLine)
(&toggle).clearAlt()
line = toggle
}
inPFT = !inPFT
}
if line != nil {
lines = append(lines, line)
}
if err == io.EOF {
break
}
}
return Document(lines), nil
}
// ParseLine parses a single line (including the trailing \n) into a gemtext.Line.
func ParseLine(line []byte) Line {
if len(line) == 0 {
return nil
}
switch line[0] {
case '=':
if len(line) == 1 || line[1] != '>' {
break
}
return parseLinkLine(line)
case '`':
if len(line) < 3 || line[1] != '`' || line[2] != '`' {
break
}
return parsePreformatToggleLine(line)
case '#':
level := 1
if len(line) > 1 && line[1] == '#' {
level += 1
if len(line) > 2 && line[2] == '#' {
level += 1
}
}
return parseHeadingLine(level, line)
case '*':
if len(line) == 1 || line[1] != ' ' {
break
}
return parseListItemLine(line)
case '>':
return parseQuoteLine(line)
}
return TextLine{raw: line}
}
func parseLinkLine(raw []byte) LinkLine {
line := LinkLine{raw: raw}
// move past =>[<whitespace>]
raw = bytes.TrimLeft(raw[2:], " \t")
// find the next space or tab
spIdx := bytes.IndexByte(raw, ' ')
tbIdx := bytes.IndexByte(raw, '\t')
idx := spIdx
if idx == -1 {
idx = tbIdx
}
if tbIdx >= 0 && tbIdx < idx {
idx = tbIdx
}
if idx < 0 {
line.URL = bytes.TrimRight(raw, "\r\n")
return line
}
line.URL = raw[:idx]
raw = raw[idx+1:]
label := bytes.TrimRight(bytes.TrimLeft(raw, " \t"), "\r\n")
if len(label) > 0 {
line.Label = label
}
return line
}
func parsePreformatToggleLine(raw []byte) PreformatToggleLine {
line := PreformatToggleLine{raw: raw}
raw = bytes.TrimRight(raw[3:], "\r\n")
if len(raw) > 0 {
line.AltText = raw
}
return line
}
func parseHeadingLine(level int, raw []byte) HeadingLine {
return HeadingLine{
raw: raw,
lineType: LineTypeHeading1 - 1 + LineType(level),
Body: bytes.TrimRight(bytes.TrimLeft(raw[level:], " \t"), "\r\n"),
}
}
func parseListItemLine(raw []byte) ListItemLine {
return ListItemLine{
raw: raw,
Body: bytes.TrimRight(raw[2:], "\r\n"),
}
}
func parseQuoteLine(raw []byte) QuoteLine {
return QuoteLine{
raw: raw,
Body: bytes.TrimRight(raw[1:], "\r\n"),
}
}
|
