-
Notifications
You must be signed in to change notification settings - Fork 0
/
parser.go
174 lines (160 loc) · 3.49 KB
/
parser.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
169
170
171
172
173
174
package fml
import (
"io"
"strings"
)
type Parser interface {
Parse(text string) (*Uta, error)
}
// ----------------------------------------------------------------------------
// ParserImpl
// ----------------------------------------------------------------------------
type parserImpl struct {
}
func NewParser() Parser {
return &parserImpl{}
}
func (p *parserImpl) Parse(text string) (*Uta, error) {
var err error
var u interface{}
s := &state{
runes: []rune(text),
index: 0,
}
_, u, err = uta(s)
if err != nil {
return nil, err
}
return u.(*Uta), nil
}
// ----------------------------------------------------------------------------
// FML Parser
// ----------------------------------------------------------------------------
var uta parser = func(s *state) (*state, interface{}, error) {
var u Uta
var err error
var obj interface{}
for {
s, _, _ = skip0(s)
s, obj, err = choice(
text,
refer("image", NewImage),
refer("video", NewVideo),
refer("audio", NewAudio),
refer("link", NewLink),
refer("markdown", NewMarkdown))(s)
if err == io.EOF {
break
}
if err != nil {
return nil, nil, err
}
u.Rens = append(u.Rens, obj.(Ren))
s, _, _ = skip0(s)
}
return s, &u, nil
}
var text parser = func(s *state) (*state, interface{}, error) {
if s.isEmpty() {
return nil, nil, io.EOF
}
if s.at(0) == '[' {
return nil, nil, s.error("'[' not allowed for text.")
}
var runes []rune
for {
if s.isEmpty() {
return s, NewText(strings.TrimSpace(string(runes))), nil
}
r := s.at(0)
if r == '[' {
return s, NewText(strings.TrimSpace(string(runes))), nil
}
s = s.consume(1)
if r == '\r' || r == '\n' {
if s.isEmpty() {
return s, NewText(strings.TrimSpace(string(runes))), nil
}
runes = append(runes, r)
r = s.at(0)
if r == '\r' || r == '\n' {
return s.consume(1), NewText(strings.TrimSpace(string(runes))), nil
}
} else {
runes = append(runes, r)
}
}
}
type kv struct {
key string
value string
}
func refer(name string, conv func(map[string]string) Ren) parser {
return func(s *state) (*state, interface{}, error) {
var err error
s, _, err = char('[')(s)
if err != nil {
return nil, nil, err
}
s, _, _ = skip0(s)
s, _, err = str(name)(s)
if err != nil {
return nil, nil, err
}
s, _, err = skip1(s)
if err != nil {
return nil, nil, err
}
s, dictI, err := sep1(referAttr, skip1)(s)
if err != nil {
return nil, nil, err
}
s, _, _ = skip0(s)
s, _, err = char(']')(s)
if err != nil {
return nil, nil, err
}
dict := make(map[string]string)
for _, v := range dictI.([]interface{}) {
ent := v.(kv)
dict[ent.key] = ent.value
}
return s, conv(dict), nil
}
}
var referAttrKey = manyRunes1(func(r rune) bool {
return r != '=' && r != '[' && r != ']' && r != '"' && !isSpace(r)
})
var referAttrValue = func(s *state) (*state, interface{}, error) {
var err error
var value interface{}
s, _, err = char('"')(s)
if err != nil {
return nil, nil, err
}
s, value, err = manyRunes0(func(r rune) bool {
return r != '"'
})(s)
s, _, err = char('"')(s)
return s, value, nil
}
var referAttr parser = func(s *state) (*state, interface{}, error) {
var err error
var keyI, valueI interface{}
s, keyI, err = referAttrKey(s)
if err != nil {
return nil, nil, err
}
s, _, err = char('=')(s)
if err != nil {
return nil, nil, err
}
s, valueI, err = referAttrValue(s)
if err != nil {
return nil, nil, err
}
return s, kv{
key: keyI.(string),
value: valueI.(string),
}, nil
}