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bbcode.lua
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bbcode.lua
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-- Invoke with: pandoc -t sample.lua
-- Blocksep is used to separate block elements.
function Blocksep()
return "\n\n"
end
-- This function is called once for the whole document. Parameters:
-- body, title, date are strings; authors is an array of strings;
-- variables is a table. One could use some kind of templating
-- system here; this just gives you a simple standalone HTML file.
function Doc(body, title, authors, date, variables)
return body .. '\n'
end
-- The functions that follow render corresponding pandoc elements.
-- s is always a string, attr is always a table of attributes, and
-- items is always an array of strings (the items in a list).
-- Comments indicate the types of other variables.
function Str(s)
return s
end
function Space()
return " "
end
function LineBreak()
return "\n"
end
function Emph(s)
return "[em]" .. s .. "[/em]"
end
function Strong(s)
return "[b]" .. s .. "[/b]"
end
function Subscript(s)
error("Subscript isn't supported")
end
function Superscript(s)
return s
end
function SmallCaps(s)
error("SmallCaps isn't supported")
end
function Strikeout(s)
return '[del]' .. s .. '[/del]'
end
function Link(s, src, tit)
local ret = '[url'
if s then
ret = ret .. '=' .. src
else
s = src
end
ret = ret .. "]" .. s .. "[/url]"
return ret
end
function Image(s, src, tit)
return "[img=" .. tit .. "]" .. src .. "[/img]"
end
function Code(s, attr)
return "[u]" .. s .. "[/u]"
end
function InlineMath(s)
error("InlineMath isn't supported")
end
function DisplayMath(s)
error("DisplayMath isn't supported")
end
function Note(s)
error("Note isn't supported")
end
function Plain(s)
return s
end
function Para(s)
return s
end
-- lev is an integer, the header level.
function Header(lev, s, attr)
return "[h]" .. s .. "[/h]"
end
function BlockQuote(s)
return "[quote]\n" .. s .. "\n[/quote]"
end
function HorizontalRule()
return "--------------------------------------------------------------------------------"
end
function CodeBlock(s, attr)
return "[code]\n" .. s .. '\n[/code]'
end
function BulletList(items)
local buffer = {}
for _, item in ipairs(items) do
table.insert(buffer, "[*]" .. item)
end
return "[list]\n" .. table.concat(buffer, "\n") .. "\n[/list]"
end
function OrderedList(items)
local buffer = {}
for _, item in ipairs(items) do
table.insert(buffer, "[*]" .. item)
end
return "[list=1]\n" .. table.concat(buffer, "\n") .. "\n[/list]"
end
-- Revisit association list STackValue instance.
function DefinitionList(items)
local buffer = {}
for _, item in pairs(items) do
for k, v in pairs(item) do
table.insert(buffer, "[b]" .. k .. "[/b]:\n" ..
table.concat(v, "\n"))
end
end
return table.concat(buffer, "\n")
end
-- Convert pandoc alignment to something HTML can use.
-- align is AlignLeft, AlignRight, AlignCenter, or AlignDefault.
function html_align(align)
if align == 'AlignLeft' then
return 'left'
elseif align == 'AlignRight' then
return 'right'
elseif align == 'AlignCenter' then
return 'center'
else
return 'left'
end
end
-- Caption is a string, aligns is an array of strings,
-- widths is an array of floats, headers is an array of
-- strings, rows is an array of arrays of strings.
function Table(caption, aligns, widths, headers, rows)
error("Table isn't supported")
end
function RawBlock(format, str)
return '[code]\n' .. str .. '\n[/code]\n'
end
function Span(s, attr)
return s
end
function Div(s, attr)
return s .. '\n'
end
-- The following code will produce runtime warnings when you haven't defined
-- all of the functions you need for the custom writer, so it's useful
-- to include when you're working on a writer.
local meta = {}
meta.__index =
function(_, key)
io.stderr:write(string.format("WARNING: Undefined function '%s'\n",key))
return function() return "" end
end
setmetatable(_G, meta)