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1-- This is a sample custom writer for pandoc. It produces output
2-- that is very similar to that of pandoc's HTML writer.
3-- There is one new feature: code blocks marked with class 'dot'
4-- are piped through graphviz and images are included in the HTML
5-- output using 'data:' URLs.
6--
7-- Invoke with: pandoc -t sample.lua
8--
9-- Note: you need not have lua installed on your system to use this
10-- custom writer. However, if you do have lua installed, you can
11-- use it to test changes to the script. 'lua sample.lua' will
12-- produce informative error messages if your code contains
13-- syntax errors.
14
15-- Character escaping
16local function escape(s, in_attribute)
17 return s:gsub("[<>&\"']",
18 function(x)
19 if x == '<' then
20 return '&lt;'
21 elseif x == '>' then
22 return '&gt;'
23 elseif x == '&' then
24 return '&amp;'
25 elseif x == '"' then
26 return '&quot;'
27 elseif x == "'" then
28 return '&#39;'
29 else
30 return x
31 end
32 end)
33end
34
35-- Helper function to convert an attributes table into
36-- a string that can be put into HTML tags.
37local function attributes(attr)
38 local attr_table = {}
39 for x,y in pairs(attr) do
40 if y and y ~= "" then
41 table.insert(attr_table, ' ' .. x .. '="' .. escape(y,true) .. '"')
42 end
43 end
44 return table.concat(attr_table)
45end
46
47-- Run cmd on a temporary file containing inp and return result.
48local function pipe(cmd, inp)
49 local tmp = os.tmpname()
50 local tmph = io.open(tmp, "w")
51 tmph:write(inp)
52 tmph:close()
53 local outh = io.popen(cmd .. " " .. tmp,"r")
54 local result = outh:read("*all")
55 outh:close()
56 os.remove(tmp)
57 return result
58end
59
60-- Table to store footnotes, so they can be included at the end.
61local notes = {}
62
63-- Blocksep is used to separate block elements.
64function Blocksep()
65 return "\n\n"
66end
67
68-- This function is called once for the whole document. Parameters:
69-- body is a string, metadata is a table, variables is a table.
70-- One could use some kind of templating
71-- system here; this just gives you a simple standalone HTML file.
72function Doc(body, metadata, variables)
73 local buffer = {}
74 local function add(s)
75 table.insert(buffer, s)
76 end
77 add('<!DOCTYPE html>')
78 add('<html>')
79 add('<head>')
80 add('<title>' .. (metadata['title'] or '') .. '</title>')
81 add('</head>')
82 add('<body>')
83 if metadata['title'] and metadata['title'] ~= "" then
84 add('<h1 class="title">' .. metadata['title'] .. '</h1>')
85 end
86 for _, author in pairs(metadata['author'] or {}) do
87 add('<h2 class="author">' .. author .. '</h2>')
88 end
89 if metadata['date'] and metadata['date'] ~= "" then
90 add('<h3 class="date">' .. metadata.date .. '</h3>')
91 end
92 add(body)
93 if #notes > 0 then
94 add('<ol class="footnotes">')
95 for _,note in pairs(notes) do
96 add(note)
97 end
98 add('</ol>')
99 end
100 add('</body>')
101 add('</html>')
102 return table.concat(buffer,'\n')
103end
104
105-- The functions that follow render corresponding pandoc elements.
106-- s is always a string, attr is always a table of attributes, and
107-- items is always an array of strings (the items in a list).
108-- Comments indicate the types of other variables.
109
110function Str(s)
111 return escape(s)
112end
113
114function Space()
115 return " "
116end
117
118function LineBreak()
119 return "<br/>"
120end
121
122function Emph(s)
123 return "<em>" .. s .. "</em>"
124end
125
126function Strong(s)
127 return "<strong>" .. s .. "</strong>"
128end
129
130function Subscript(s)
131 return "<sub>" .. s .. "</sub>"
132end
133
134function Superscript(s)
135 return "<sup>" .. s .. "</sup>"
136end
137
138function SmallCaps(s)
139 return '<span style="font-variant: small-caps;">' .. s .. '</span>'
140end
141
142function Strikeout(s)
143 return '<del>' .. s .. '</del>'
144end
145
146function Link(s, src, tit)
147 return "<a href='" .. escape(src,true) .. "' title='" ..
148 escape(tit,true) .. "'>" .. s .. "</a>"
149end
150
151function Image(s, src, tit)
152 return "<img src='" .. escape(src,true) .. "' title='" ..
153 escape(tit,true) .. "'/>"
154end
155
156function Code(s, attr)
157 return "<code" .. attributes(attr) .. ">" .. escape(s) .. "</code>"
158end
159
160function InlineMath(s)
161 return "\\(" .. escape(s) .. "\\)"
162end
163
164function DisplayMath(s)
165 return "\\[" .. escape(s) .. "\\]"
166end
167
168function Note(s)
169 local num = #notes + 1
170 -- insert the back reference right before the final closing tag.
171 s = string.gsub(s,
172 '(.*)</', '%1 <a href="#fnref' .. num .. '">&#8617;</a></')
173 -- add a list item with the note to the note table.
174 table.insert(notes, '<li id="fn' .. num .. '">' .. s .. '</li>')
175 -- return the footnote reference, linked to the note.
176 return '<a id="fnref' .. num .. '" href="#fn' .. num ..
177 '"><sup>' .. num .. '</sup></a>'
178end
179
180function Span(s, attr)
181 return "<span" .. attributes(attr) .. ">" .. s .. "</span>"
182end
183
184function Cite(s)
185 return "<span class=\"cite\">" .. s .. "</span>"
186end
187
188function Plain(s)
189 return s
190end
191
192function Para(s)
193 return "<p>" .. s .. "</p>"
194end
195
196-- lev is an integer, the header level.
197function Header(lev, s, attr)
198 return "<h" .. lev .. attributes(attr) .. ">" .. s .. "</h" .. lev .. ">"
199end
200
201function BlockQuote(s)
202 return "<blockquote>\n" .. s .. "\n</blockquote>"
203end
204
205function HorizontalRule()
206 return "<hr/>"
207end
208
209function CodeBlock(s, attr)
210 -- If code block has class 'dot', pipe the contents through dot
211 -- and base64, and include the base64-encoded png as a data: URL.
212 if attr.class and string.match(' ' .. attr.class .. ' ',' dot ') then
213 local png = pipe("base64", pipe("dot -Tpng", s))
214 return '<img src="data:image/png;base64,' .. png .. '"/>'
215 -- otherwise treat as code (one could pipe through a highlighter)
216 else
217 return "<pre><code" .. attributes(attr) .. ">" .. escape(s) ..
218 "</code></pre>"
219 end
220end
221
222function BulletList(items)
223 local buffer = {}
224 for _, item in pairs(items) do
225 table.insert(buffer, "<li>" .. item .. "</li>")
226 end
227 return "<ul>\n" .. table.concat(buffer, "\n") .. "\n</ul>"
228end
229
230function OrderedList(items)
231 local buffer = {}
232 for _, item in pairs(items) do
233 table.insert(buffer, "<li>" .. item .. "</li>")
234 end
235 return "<ol>\n" .. table.concat(buffer, "\n") .. "\n</ol>"
236end
237
238-- Revisit association list STackValue instance.
239function DefinitionList(items)
240 local buffer = {}
241 for _,item in pairs(items) do
242 for k, v in pairs(item) do
243 table.insert(buffer,"<dt>" .. k .. "</dt>\n<dd>" ..
244 table.concat(v,"</dd>\n<dd>") .. "</dd>")
245 end
246 end
247 return "<dl>\n" .. table.concat(buffer, "\n") .. "\n</dl>"
248end
249
250-- Convert pandoc alignment to something HTML can use.
251-- align is AlignLeft, AlignRight, AlignCenter, or AlignDefault.
252function html_align(align)
253 if align == 'AlignLeft' then
254 return 'left'
255 elseif align == 'AlignRight' then
256 return 'right'
257 elseif align == 'AlignCenter' then
258 return 'center'
259 else
260 return 'left'
261 end
262end
263
264-- Caption is a string, aligns is an array of strings,
265-- widths is an array of floats, headers is an array of
266-- strings, rows is an array of arrays of strings.
267function Table(caption, aligns, widths, headers, rows)
268 local buffer = {}
269 local function add(s)
270 table.insert(buffer, s)
271 end
272 add("<table>")
273 if caption ~= "" then
274 add("<caption>" .. caption .. "</caption>")
275 end
276 if widths and widths[1] ~= 0 then
277 for _, w in pairs(widths) do
278 add('<col width="' .. string.format("%d%%", w * 100) .. '" />')
279 end
280 end
281 local header_row = {}
282 local empty_header = true
283 for i, h in pairs(headers) do
284 local align = html_align(aligns[i])
285 table.insert(header_row,'<th align="' .. align .. '">' .. h .. '</th>')
286 empty_header = empty_header and h == ""
287 end
288 if empty_header then
289 head = ""
290 else
291 add('<tr class="header">')
292 for _,h in pairs(header_row) do
293 add(h)
294 end
295 add('</tr>')
296 end
297 local class = "even"
298 for _, row in pairs(rows) do
299 class = (class == "even" and "odd") or "even"
300 add('<tr class="' .. class .. '">')
301 for i,c in pairs(row) do
302 add('<td align="' .. html_align(aligns[i]) .. '">' .. c .. '</td>')
303 end
304 add('</tr>')
305 end
306 add('</table')
307 return table.concat(buffer,'\n')
308end
309
310function Div(s, attr)
311 return "<div" .. attributes(attr) .. ">\n" .. s .. "</div>"
312end
313
314-- The following code will produce runtime warnings when you haven't defined
315-- all of the functions you need for the custom writer, so it's useful
316-- to include when you're working on a writer.
317local meta = {}
318meta.__index =
319 function(_, key)
320 io.stderr:write(string.format("WARNING: Undefined function '%s'\n",key))
321 return function() return "" end
322 end
323setmetatable(_G, meta)
324