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
180
181
182
183
184
185
186
187
188
189
190
|
-- A sample custom reader for Creole 1.0 (common wiki markup)
-- http://www.wikicreole.org/wiki/CheatSheet
-- For better performance we put these functions in local variables:
local P, S, R, Cf, Cc, Ct, V, Cs, Cg, Cb, B, C, Cmt =
lpeg.P, lpeg.S, lpeg.R, lpeg.Cf, lpeg.Cc, lpeg.Ct, lpeg.V,
lpeg.Cs, lpeg.Cg, lpeg.Cb, lpeg.B, lpeg.C, lpeg.Cmt
local whitespacechar = S(" \t\r\n")
local specialchar = S("/*~[]\\{}|")
local wordchar = (1 - (whitespacechar + specialchar))
local spacechar = S(" \t")
local newline = P"\r"^-1 * P"\n"
local blankline = spacechar^0 * newline
local endline = newline * #-blankline
local endequals = spacechar^0 * P"="^0 * spacechar^0 * newline
local cellsep = spacechar^0 * P"|"
local function trim(s)
return (s:gsub("^%s*(.-)%s*$", "%1"))
end
local function ListItem(lev, ch)
local start
if ch == nil then
start = S"*#"
else
start = P(ch)
end
local subitem = function(c)
if lev < 6 then
return ListItem(lev + 1, c)
else
return (1 - 1) -- fails
end
end
local parser = spacechar^0
* start^lev
* #(- start)
* spacechar^0
* Ct((V"Inline" - (newline * spacechar^0 * S"*#"))^0)
* newline
* (Ct(subitem("*")^1) / pandoc.BulletList
+
Ct(subitem("#")^1) / pandoc.OrderedList
+
Cc(nil))
/ function (ils, sublist)
return { pandoc.Plain(ils), sublist }
end
return parser
end
-- Grammar
G = P{ "Doc",
Doc = Ct(V"Block"^0)
/ pandoc.Pandoc ;
Block = blankline^0
* ( V"Header"
+ V"HorizontalRule"
+ V"CodeBlock"
+ V"List"
+ V"Table"
+ V"Para") ;
Para = Ct(V"Inline"^1)
* newline
/ pandoc.Para ;
HorizontalRule = spacechar^0
* P"----"
* spacechar^0
* newline
/ pandoc.HorizontalRule;
Header = (P("=")^1 / string.len)
* spacechar^1
* Ct((V"Inline" - endequals)^1)
* endequals
/ pandoc.Header;
CodeBlock = P"{{{"
* blankline
* C((1 - (newline * P"}}}"))^0)
* newline
* P"}}}"
/ pandoc.CodeBlock;
Placeholder = P"<<<"
* C(P(1) - P">>>")^0
* P">>>"
/ function() return pandoc.Div({}) end;
List = V"BulletList"
+ V"OrderedList" ;
BulletList = Ct(ListItem(1,'*')^1)
/ pandoc.BulletList ;
OrderedList = Ct(ListItem(1,'#')^1)
/ pandoc.OrderedList ;
Table = (V"TableHeader" + Cc{})
* Ct(V"TableRow"^1)
/ function(headrow, bodyrows)
local numcolumns = #(bodyrows[1])
local aligns = {}
local widths = {}
for i = 1,numcolumns do
aligns[i] = pandoc.AlignDefault
widths[i] = 0
end
return pandoc.utils.from_simple_table(
pandoc.SimpleTable({}, aligns, widths, headrow, bodyrows))
end ;
TableHeader = Ct(V"HeaderCell"^1)
* cellsep^-1
* spacechar^0
* newline ;
TableRow = Ct(V"BodyCell"^1)
* cellsep^-1
* spacechar^0
* newline ;
HeaderCell = cellsep
* P"="
* spacechar^0
* Ct((V"Inline" - (newline + cellsep))^0)
/ function(ils) return { pandoc.Plain(ils) } end ;
BodyCell = cellsep
* spacechar^0
* Ct((V"Inline" - (newline + cellsep))^0)
/ function(ils) return { pandoc.Plain(ils) } end ;
Inline = V"Emph"
+ V"Strong"
+ V"LineBreak"
+ V"Link"
+ V"URL"
+ V"Image"
+ V"Str"
+ V"Space"
+ V"SoftBreak"
+ V"Escaped"
+ V"Placeholder"
+ V"Code"
+ V"Special" ;
Str = wordchar^1
/ pandoc.Str;
Escaped = P"~"
* C(P(1))
/ pandoc.Str ;
Special = specialchar
/ pandoc.Str;
Space = spacechar^1
/ pandoc.Space ;
SoftBreak = endline
* # -(V"HorizontalRule" + V"CodeBlock")
/ pandoc.SoftBreak ;
LineBreak = P"\\\\"
/ pandoc.LineBreak ;
Code = P"{{{"
* C((1 - P"}}}")^0)
* P"}}}"
/ trim / pandoc.Code ;
Link = P"[["
* C((1 - (P"]]" + P"|"))^0)
* (P"|" * Ct((V"Inline" - P"]]")^1))^-1 * P"]]"
/ function(url, desc)
local txt = desc or {pandoc.Str(url)}
return pandoc.Link(txt, url)
end ;
Image = P"{{"
* #-P"{"
* C((1 - (S"}"))^0)
* (P"|" * Ct((V"Inline" - P"}}")^1))^-1
* P"}}"
/ function(url, desc)
local txt = desc or ""
return pandoc.Image(txt, url)
end ;
URL = P"http"
* P"s"^-1
* P":"
* (1 - (whitespacechar + (S",.?!:;\"'" * #whitespacechar)))^1
/ function(url)
return pandoc.Link(pandoc.Str(url), url)
end ;
Emph = P"//"
* Ct((V"Inline" - P"//")^1)
* P"//"
/ pandoc.Emph ;
Strong = P"**"
* Ct((V"Inline" -P"**")^1)
* P"**"
/ pandoc.Strong ;
}
function Reader(input, reader_options)
return lpeg.match(G, input)
end
|
