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|
--
-- Copyright (C) 2009-2016 John MacFarlane, Hans Hagen
--
-- Permission is hereby granted, free of charge, to any person obtaining
-- a copy of this software and associated documentation files (the
-- "Software"), to deal in the Software without restriction, including
-- without limitation the rights to use, copy, modify, merge, publish,
-- distribute, sublicense, and/or sell copies of the Software, and to
-- permit persons to whom the Software is furnished to do so, subject to
-- the following conditions:
--
-- The above copyright notice and this permission notice shall be included
-- in all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-- IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-- CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-- TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-- SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--
-- Copyright (C) 2016 Vít Novotný
--
-- This work may be distributed and/or modified under the
-- conditions of the LaTeX Project Public License, either version 1.3
-- of this license or (at your option) any later version.
-- The latest version of this license is in
--
-- http://www.latex-project.org/lppl.txt
--
-- and version 1.3 or later is part of all distributions of LaTeX
-- version 2005/12/01 or later.
--
-- This work has the LPPL maintenance status `maintained'.
-- The Current Maintainer of this work is Vít Novotný.
--
-- Send bug reports, requests for additions and questions
-- either to the GitHub issue tracker at
--
-- https://github.com/witiko/markdown/issues
--
-- or to the e-mail address <witiko@mail.muni.cz>.
--
-- MODIFICATION ADVICE:
--
-- If you want to customize this file, it is best to make a copy of
-- the source file(s) from which it was produced. Use a different
-- name for your copy(ies) and modify the copy(ies); this will ensure
-- that your modifications do not get overwritten when you install a
-- new release of the standard system. You should also ensure that
-- your modified source file does not generate any modified file with
-- the same name as a standard file.
--
-- You will also need to produce your own, suitably named, .ins file to
-- control the generation of files from your source file; this file
-- should contain your own preambles for the files it generates, not
-- those in the standard .ins files.
--
local metadata = {
version = "2.1.1",
comment = "A module for the conversion from markdown to plain TeX",
author = "John MacFarlane, Hans Hagen, Vít Novotný",
copyright = "2009-2016 John MacFarlane, Hans Hagen; 2016 Vít Novotný",
license = "LPPL 1.3"
}
if not modules then modules = { } end
modules['markdown'] = metadata
local lpeg = require("lpeg")
local unicode = require("unicode")
local md5 = require("md5")
local M = {}
local defaultOptions = {}
defaultOptions.blankBeforeBlockquote = false
defaultOptions.blankBeforeCodeFence = false
defaultOptions.blankBeforeHeading = false
defaultOptions.cacheDir = "."
defaultOptions.citationNbsps = true
defaultOptions.citations = false
defaultOptions.definitionLists = false
defaultOptions.hashEnumerators = false
defaultOptions.hybrid = false
defaultOptions.fencedCode = false
defaultOptions.footnotes = false
defaultOptions.preserveTabs = false
defaultOptions.smartEllipses = false
defaultOptions.startNumber = true
defaultOptions.tightLists = true
local upper, gsub, format, length =
string.upper, string.gsub, string.format, string.len
local concat = table.concat
local P, R, S, V, C, Cg, Cb, Cmt, Cc, Ct, B, Cs, any =
lpeg.P, lpeg.R, lpeg.S, lpeg.V, lpeg.C, lpeg.Cg, lpeg.Cb,
lpeg.Cmt, lpeg.Cc, lpeg.Ct, lpeg.B, lpeg.Cs, lpeg.P(1)
local util = {}
function util.err(msg, exit_code)
io.stderr:write("markdown.lua: " .. msg .. "\n")
os.exit(exit_code or 1)
end
function util.cache(dir, string, salt, transform, suffix)
local digest = md5.sumhexa(string .. (salt or ""))
local name = util.pathname(dir, digest .. suffix)
local file = io.open(name, "r")
if file == nil then -- If no cache entry exists, then create a new one.
local file = assert(io.open(name, "w"))
local result = string
if transform ~= nil then
result = transform(result)
end
assert(file:write(result))
assert(file:close())
end
return name
end
function util.table_copy(t)
local u = { }
for k, v in pairs(t) do u[k] = v end
return setmetatable(u, getmetatable(t))
end
function util.expand_tabs_in_line(s, tabstop)
local tab = tabstop or 4
local corr = 0
return (s:gsub("()\t", function(p)
local sp = tab - (p - 1 + corr) % tab
corr = corr - 1 + sp
return string.rep(" ", sp)
end))
end
function util.walk(t, f)
local typ = type(t)
if typ == "string" then
f(t)
elseif typ == "table" then
local i = 1
local n
n = t[i]
while n do
util.walk(n, f)
i = i + 1
n = t[i]
end
elseif typ == "function" then
local ok, val = pcall(t)
if ok then
util.walk(val,f)
end
else
f(tostring(t))
end
end
function util.flatten(ary)
local new = {}
for _,v in ipairs(ary) do
if type(v) == "table" then
for _,w in ipairs(util.flatten(v)) do
new[#new + 1] = w
end
else
new[#new + 1] = v
end
end
return new
end
function util.rope_to_string(rope)
local buffer = {}
util.walk(rope, function(x) buffer[#buffer + 1] = x end)
return table.concat(buffer)
end
function util.rope_last(rope)
if #rope == 0 then
return nil
else
local l = rope[#rope]
if type(l) == "table" then
return util.rope_last(l)
else
return l
end
end
end
function util.intersperse(ary, x)
local new = {}
local l = #ary
for i,v in ipairs(ary) do
local n = #new
new[n + 1] = v
if i ~= l then
new[n + 2] = x
end
end
return new
end
function util.map(ary, f)
local new = {}
for i,v in ipairs(ary) do
new[i] = f(v)
end
return new
end
function util.escaper(char_escapes, string_escapes)
local char_escapes_list = ""
for i,_ in pairs(char_escapes) do
char_escapes_list = char_escapes_list .. i
end
local escapable = S(char_escapes_list) / char_escapes
if string_escapes then
for k,v in pairs(string_escapes) do
escapable = P(k) / v + escapable
end
end
local escape_string = Cs((escapable + any)^0)
return function(s)
return lpeg.match(escape_string, s)
end
end
function util.pathname(dir, file)
if #dir == 0 then
return file
else
return dir .. "/" .. file
end
end
M.writer = {}
function M.writer.new(options)
local self = {}
options = options or {}
setmetatable(options, { __index = function (_, key)
return defaultOptions[key] end })
self.suffix = ".tex"
self.space = " "
self.nbsp = "\\markdownRendererNbsp{}"
function self.plain(s)
return s
end
function self.paragraph(s)
return s
end
function self.pack(name)
return [[\input"]] .. name .. [["\relax]]
end
self.interblocksep = "\\markdownRendererInterblockSeparator\n{}"
self.eof = [[\relax]]
self.linebreak = "\\markdownRendererLineBreak\n{}"
self.ellipsis = "\\markdownRendererEllipsis{}"
self.hrule = "\\markdownRendererHorizontalRule{}"
local escaped_chars = {
["{"] = "\\markdownRendererLeftBrace{}",
["}"] = "\\markdownRendererRightBrace{}",
["$"] = "\\markdownRendererDollarSign{}",
["%"] = "\\markdownRendererPercentSign{}",
["&"] = "\\markdownRendererAmpersand{}",
["_"] = "\\markdownRendererUnderscore{}",
["#"] = "\\markdownRendererHash{}",
["^"] = "\\markdownRendererCircumflex{}",
["\\"] = "\\markdownRendererBackslash{}",
["~"] = "\\markdownRendererTilde{}",
["|"] = "\\markdownRendererPipe{}", }
local escaped_minimal_chars = {
["{"] = "\\markdownRendererLeftBrace{}",
["}"] = "\\markdownRendererRightBrace{}",
["%"] = "\\markdownRendererPercentSign{}",
["\\"] = "\\markdownRendererBackslash{}", }
local escaped_minimal_strings = {
["^^"] = "\\markdownRendererCircumflex\\markdownRendererCircumflex ", }
local escape = util.escaper(escaped_chars)
local escape_minimal = util.escaper(escaped_minimal_chars,
escaped_minimal_strings)
if options.hybrid then
self.string = function(s) return s end
self.uri = function(u) return u end
else
self.string = escape
self.uri = escape_minimal
end
function self.code(s)
return {"\\markdownRendererCodeSpan{",escape(s),"}"}
end
function self.link(lab,src,tit)
return {"\\markdownRendererLink{",lab,"}",
"{",self.string(src),"}",
"{",self.uri(src),"}",
"{",self.string(tit or ""),"}"}
end
function self.image(lab,src,tit)
return {"\\markdownRendererImage{",lab,"}",
"{",self.string(src),"}",
"{",self.uri(src),"}",
"{",self.string(tit or ""),"}"}
end
local function ulitem(s)
return {"\\markdownRendererUlItem ",s,
"\\markdownRendererUlItemEnd "}
end
function self.bulletlist(items,tight)
local buffer = {}
for _,item in ipairs(items) do
buffer[#buffer + 1] = ulitem(item)
end
local contents = util.intersperse(buffer,"\n")
if tight and options.tightLists then
return {"\\markdownRendererUlBeginTight\n",contents,
"\n\\markdownRendererUlEndTight "}
else
return {"\\markdownRendererUlBegin\n",contents,
"\n\\markdownRendererUlEnd "}
end
end
local function olitem(s,num)
if num ~= nil then
return {"\\markdownRendererOlItemWithNumber{",num,"}",s,
"\\markdownRendererOlItemEnd "}
else
return {"\\markdownRendererOlItem ",s,
"\\markdownRendererOlItemEnd "}
end
end
function self.orderedlist(items,tight,startnum)
local buffer = {}
local num = startnum
for _,item in ipairs(items) do
buffer[#buffer + 1] = olitem(item,num)
if num ~= nil then
num = num + 1
end
end
local contents = util.intersperse(buffer,"\n")
if tight and options.tightLists then
return {"\\markdownRendererOlBeginTight\n",contents,
"\n\\markdownRendererOlEndTight "}
else
return {"\\markdownRendererOlBegin\n",contents,
"\n\\markdownRendererOlEnd "}
end
end
local function dlitem(term, defs)
local retVal = {"\\markdownRendererDlItem{",term,"}"}
for _, def in ipairs(defs) do
retVal[#retVal+1] = {"\\markdownRendererDlDefinitionBegin ",def,
"\\markdownRendererDlDefinitionEnd "}
end
retVal[#retVal+1] = "\\markdownRendererDlItemEnd "
return retVal
end
function self.definitionlist(items,tight)
local buffer = {}
for _,item in ipairs(items) do
buffer[#buffer + 1] = dlitem(item.term, item.definitions)
end
if tight and options.tightLists then
return {"\\markdownRendererDlBeginTight\n", buffer,
"\n\\markdownRendererDlEndTight"}
else
return {"\\markdownRendererDlBegin\n", buffer,
"\n\\markdownRendererDlEnd"}
end
end
function self.emphasis(s)
return {"\\markdownRendererEmphasis{",s,"}"}
end
function self.strong(s)
return {"\\markdownRendererStrongEmphasis{",s,"}"}
end
function self.blockquote(s)
return {"\\markdownRendererBlockQuoteBegin\n",s,
"\n\\markdownRendererBlockQuoteEnd "}
end
function self.verbatim(s)
local name = util.cache(options.cacheDir, s, nil, nil, ".verbatim")
return {"\\markdownRendererInputVerbatim{",name,"}"}
end
function self.fencedCode(i, s)
local name = util.cache(options.cacheDir, s, nil, nil, ".verbatim")
return {"\\markdownRendererInputFencedCode{",name,"}{",i,"}"}
end
function self.heading(s,level)
local cmd
if level == 1 then
cmd = "\\markdownRendererHeadingOne"
elseif level == 2 then
cmd = "\\markdownRendererHeadingTwo"
elseif level == 3 then
cmd = "\\markdownRendererHeadingThree"
elseif level == 4 then
cmd = "\\markdownRendererHeadingFour"
elseif level == 5 then
cmd = "\\markdownRendererHeadingFive"
elseif level == 6 then
cmd = "\\markdownRendererHeadingSix"
else
cmd = ""
end
return {cmd,"{",s,"}"}
end
function self.note(s)
return {"\\markdownRendererFootnote{",s,"}"}
end
function self.citations(text_cites, cites)
local buffer = {"\\markdownRenderer", text_cites and "TextCite" or "Cite",
"{", #cites, "}"}
for _,cite in ipairs(cites) do
buffer[#buffer+1] = {cite.suppress_author and "-" or "+", "{",
cite.prenote or "", "}{", cite.postnote or "", "}{", cite.name, "}"}
end
return buffer
end
return self
end
M.reader = {}
function M.reader.new(writer, options)
local self = {}
options = options or {}
setmetatable(options, { __index = function (_, key)
return defaultOptions[key] end })
local function normalize_tag(tag)
return unicode.utf8.lower(
gsub(util.rope_to_string(tag), "[ \n\r\t]+", " "))
end
local expandtabs
if options.preserveTabs then
expandtabs = function(s) return s end
else
expandtabs = function(s)
if s:find("\t") then
return s:gsub("[^\n]*", util.expand_tabs_in_line)
else
return s
end
end
end
local syntax
local blocks_toplevel
local blocks
local inlines, inlines_no_link, inlines_nbsp
local function create_parser(name, grammar)
return function(str)
local res = lpeg.match(grammar(), str)
if res == nil then
error(format("%s failed on:\n%s", name, str:sub(1,20)))
else
return res
end
end
end
local parse_blocks = create_parser("parse_blocks",
function() return blocks end)
local parse_blocks_toplevel = create_parser("parse_blocks_toplevel",
function() return blocks_toplevel end)
local parse_inlines = create_parser("parse_inlines",
function() return inlines end)
local parse_inlines_no_link = create_parser("parse_inlines_no_link",
function() return inlines_no_link end)
local parse_inlines_nbsp = create_parser("parse_inlines_nbsp",
function() return inlines_nbsp end)
local percent = P("%")
local at = P("@")
local comma = P(",")
local asterisk = P("*")
local dash = P("-")
local plus = P("+")
local underscore = P("_")
local period = P(".")
local hash = P("#")
local ampersand = P("&")
local backtick = P("`")
local less = P("<")
local more = P(">")
local space = P(" ")
local squote = P("'")
local dquote = P('"')
local lparent = P("(")
local rparent = P(")")
local lbracket = P("[")
local rbracket = P("]")
local circumflex = P("^")
local slash = P("/")
local equal = P("=")
local colon = P(":")
local semicolon = P(";")
local exclamation = P("!")
local tilde = P("~")
local digit = R("09")
local hexdigit = R("09","af","AF")
local letter = R("AZ","az")
local alphanumeric = R("AZ","az","09")
local keyword = letter * alphanumeric^0
local internal_punctuation = S(":;,.#$%&-+?<>~/")
local doubleasterisks = P("**")
local doubleunderscores = P("__")
local fourspaces = P(" ")
local any = P(1)
local fail = any - 1
local always = P("")
local escapable = S("\\`*_{}[]()+_.!<>#-~:^@;")
local anyescaped = P("\\") / "" * escapable
+ any
local tab = P("\t")
local spacechar = S("\t ")
local spacing = S(" \n\r\t")
local newline = P("\n")
local nonspacechar = any - spacing
local tightblocksep = P("\001")
local specialchar = S("*_`&[]<!\\.@-")
local normalchar = any -
(specialchar + spacing + tightblocksep)
local optionalspace = spacechar^0
local eof = - any
local nonindentspace = space^-3 * - spacechar
local indent = space^-3 * tab
+ fourspaces / ""
local linechar = P(1 - newline)
local blankline = optionalspace * newline / "\n"
local blanklines = blankline^0
local skipblanklines = (optionalspace * newline)^0
local indentedline = indent /"" * C(linechar^1 * newline^-1)
local optionallyindentedline = indent^-1 /"" * C(linechar^1 * newline^-1)
local sp = spacing^0
local spnl = optionalspace * (newline * optionalspace)^-1
local line = linechar^0 * newline
+ linechar^1 * eof
local nonemptyline = line - blankline
local chunk = line * (optionallyindentedline - blankline)^0
-- block followed by 0 or more optionally
-- indented blocks with first line indented.
local function indented_blocks(bl)
return Cs( bl
* (blankline^1 * indent * -blankline * bl)^0
* (blankline^1 + eof) )
end
local bulletchar = C(plus + asterisk + dash)
local bullet = ( bulletchar * #spacing * (tab + space^-3)
+ space * bulletchar * #spacing * (tab + space^-2)
+ space * space * bulletchar * #spacing * (tab + space^-1)
+ space * space * space * bulletchar * #spacing
) * -bulletchar
if options.hashEnumerators then
dig = digit + hash
else
dig = digit
end
local enumerator = C(dig^3 * period) * #spacing
+ C(dig^2 * period) * #spacing * (tab + space^1)
+ C(dig * period) * #spacing * (tab + space^-2)
+ space * C(dig^2 * period) * #spacing
+ space * C(dig * period) * #spacing * (tab + space^-1)
+ space * space * C(dig^1 * period) * #spacing
local openticks = Cg(backtick^1, "ticks")
local function captures_equal_length(s,i,a,b)
return #a == #b and i
end
local closeticks = space^-1 *
Cmt(C(backtick^1) * Cb("ticks"), captures_equal_length)
local intickschar = (any - S(" \n\r`"))
+ (newline * -blankline)
+ (space - closeticks)
+ (backtick^1 - closeticks)
local inticks = openticks * space^-1 * C(intickschar^0) * closeticks
local function captures_geq_length(s,i,a,b)
return #a >= #b and i
end
local infostring = (linechar - (backtick + space^1 * (newline + eof)))^0
local fenceindent
local function fencehead(char)
return C(nonindentspace) / function(s) fenceindent = #s end
* Cg(char^3, "fencelength")
* optionalspace * C(infostring) * optionalspace
* (newline + eof)
end
local function fencetail(char)
return nonindentspace
* Cmt(C(char^3) * Cb("fencelength"),
captures_geq_length)
* optionalspace * (newline + eof)
+ eof
end
local function fencedline(char)
return C(line - fencetail(char))
/ function(s)
return s:gsub("^" .. string.rep(" ?",
fenceindent), "")
end
end
local leader = space^-3
-- in balanced brackets, parentheses, quotes:
local bracketed = P{ lbracket
* ((anyescaped - (lbracket + rbracket
+ blankline^2)) + V(1))^0
* rbracket }
local inparens = P{ lparent
* ((anyescaped - (lparent + rparent
+ blankline^2)) + V(1))^0
* rparent }
local squoted = P{ squote * alphanumeric
* ((anyescaped - (squote + blankline^2))
+ V(1))^0
* squote }
local dquoted = P{ dquote * alphanumeric
* ((anyescaped - (dquote + blankline^2))
+ V(1))^0
* dquote }
-- bracketed 'tag' for markdown links, allowing nested brackets:
local tag = lbracket
* Cs((alphanumeric^1
+ bracketed
+ inticks
+ (anyescaped - (rbracket + blankline^2)))^0)
* rbracket
-- url for markdown links, allowing balanced parentheses:
local url = less * Cs((anyescaped-more)^0) * more
+ Cs((inparens + (anyescaped-spacing-rparent))^1)
-- quoted text possibly with nested quotes:
local title_s = squote * Cs(((anyescaped-squote) + squoted)^0) *
squote
local title_d = dquote * Cs(((anyescaped-dquote) + dquoted)^0) *
dquote
local title_p = lparent
* Cs((inparens + (anyescaped-rparent))^0)
* rparent
local title = title_d + title_s + title_p
local optionaltitle = spnl * title * spacechar^0
+ Cc("")
local citation_name = Cs(dash^-1) * at
* Cs(alphanumeric
* (alphanumeric + internal_punctuation
- comma - semicolon)^0)
local citation_body_prenote
= Cs((alphanumeric^1
+ bracketed
+ inticks
+ (anyescaped
- (rbracket + blankline^2))
- (spnl * dash^-1 * at))^0)
local citation_body_postnote
= Cs((alphanumeric^1
+ bracketed
+ inticks
+ (anyescaped
- (rbracket + semicolon + blankline^2))
- (spnl * rbracket))^0)
local citation_body_chunk
= citation_body_prenote
* spnl * citation_name
* (comma * spnl)^-1
* citation_body_postnote
local citation_body = citation_body_chunk
* (semicolon * spnl * citation_body_chunk)^0
local citation_headless_body_postnote
= Cs((alphanumeric^1
+ bracketed
+ inticks
+ (anyescaped
- (rbracket + at + semicolon + blankline^2))
- (spnl * rbracket))^0)
local citation_headless_body
= citation_headless_body_postnote
* (sp * semicolon * spnl * citation_body_chunk)^0
local rawnotes = {}
local function strip_first_char(s)
return s:sub(2)
end
-- like indirect_link
local function lookup_note(ref)
return function()
local found = rawnotes[normalize_tag(ref)]
if found then
return writer.note(parse_blocks_toplevel(found))
else
return {"[", parse_inlines("^" .. ref), "]"}
end
end
end
local function register_note(ref,rawnote)
rawnotes[normalize_tag(ref)] = rawnote
return ""
end
local RawNoteRef = #(lbracket * circumflex) * tag / strip_first_char
local NoteRef = RawNoteRef / lookup_note
local NoteBlock
if options.footnotes then
NoteBlock = leader * RawNoteRef * colon * spnl *
indented_blocks(chunk) / register_note
else
NoteBlock = fail
end
-- List of references defined in the document
local references
-- add a reference to the list
local function register_link(tag,url,title)
references[normalize_tag(tag)] = { url = url, title = title }
return ""
end
-- parse a reference definition: [foo]: /bar "title"
local define_reference_parser =
leader * tag * colon * spacechar^0 * url * optionaltitle * blankline^1
-- lookup link reference and return either
-- the link or nil and fallback text.
local function lookup_reference(label,sps,tag)
local tagpart
if not tag then
tag = label
tagpart = ""
elseif tag == "" then
tag = label
tagpart = "[]"
else
tagpart = {"[", parse_inlines(tag), "]"}
end
if sps then
tagpart = {sps, tagpart}
end
local r = references[normalize_tag(tag)]
if r then
return r
else
return nil, {"[", parse_inlines(label), "]", tagpart}
end
end
-- lookup link reference and return a link, if the reference is found,
-- or a bracketed label otherwise.
local function indirect_link(label,sps,tag)
return function()
local r,fallback = lookup_reference(label,sps,tag)
if r then
return writer.link(parse_inlines_no_link(label), r.url, r.title)
else
return fallback
end
end
end
-- lookup image reference and return an image, if the reference is found,
-- or a bracketed label otherwise.
local function indirect_image(label,sps,tag)
return function()
local r,fallback = lookup_reference(label,sps,tag)
if r then
return writer.image(writer.string(label), r.url, r.title)
else
return {"!", fallback}
end
end
end
local bqstart = more
local headerstart = hash
+ (line * (equal^1 + dash^1) * optionalspace * newline)
local fencestart = fencehead(backtick) + fencehead(tilde)
if options.blankBeforeBlockquote then
bqstart = fail
end
if options.blankBeforeHeading then
headerstart = fail
end
if not options.fencedCode or options.blankBeforeCodeFence then
fencestart = fail
end
local Inline = V("Inline")
local Str = normalchar^1 / writer.string
local Symbol = (specialchar - tightblocksep) / writer.string
local Ellipsis = P("...") / writer.ellipsis
local Smart = Ellipsis
local Code = inticks / writer.code
local Endline = newline * -( -- newline, but not before...
blankline -- paragraph break
+ tightblocksep -- nested list
+ eof -- end of document
+ bqstart
+ headerstart
+ fencestart
) * spacechar^0 / writer.space
local Space = spacechar^2 * Endline / writer.linebreak
+ spacechar^1 * Endline^-1 * eof / ""
+ spacechar^1 * Endline^-1 * optionalspace / writer.space
local NonbreakingEndline
= newline * -( -- newline, but not before...
blankline -- paragraph break
+ tightblocksep -- nested list
+ eof -- end of document
+ bqstart
+ headerstart
+ fencestart
) * spacechar^0 / writer.nbsp
local NonbreakingSpace
= spacechar^2 * Endline / writer.linebreak
+ spacechar^1 * Endline^-1 * eof / ""
+ spacechar^1 * Endline^-1 * optionalspace / writer.nbsp
-- parse many p between starter and ender
local function between(p, starter, ender)
local ender2 = B(nonspacechar) * ender
return (starter * #nonspacechar * Ct(p * (p - ender2)^0) * ender2)
end
local Strong = ( between(Inline, doubleasterisks, doubleasterisks)
+ between(Inline, doubleunderscores, doubleunderscores)
) / writer.strong
local Emph = ( between(Inline, asterisk, asterisk)
+ between(Inline, underscore, underscore)
) / writer.emphasis
local urlchar = anyescaped - newline - more
local AutoLinkUrl = less
* C(alphanumeric^1 * P("://") * urlchar^1)
* more
/ function(url)
return writer.link(writer.string(url), url)
end
local AutoLinkEmail = less
* C((alphanumeric + S("-._+"))^1 * P("@") * urlchar^1)
* more
/ function(email)
return writer.link(writer.string(email),
"mailto:"..email)
end
local DirectLink = (tag / parse_inlines_no_link) -- no links inside links
* spnl
* lparent
* (url + Cc("")) -- link can be empty [foo]()
* optionaltitle
* rparent
/ writer.link
local IndirectLink = tag * (C(spnl) * tag)^-1 / indirect_link
-- parse a link or image (direct or indirect)
local Link = DirectLink + IndirectLink
local DirectImage = exclamation
* (tag / parse_inlines)
* spnl
* lparent
* (url + Cc("")) -- link can be empty [foo]()
* optionaltitle
* rparent
/ writer.image
local IndirectImage = exclamation * tag * (C(spnl) * tag)^-1 /
indirect_image
local Image = DirectImage + IndirectImage
-- avoid parsing long strings of * or _ as emph/strong
local UlOrStarLine = asterisk^4 + underscore^4 / writer.string
local EscapedChar = S("\\") * C(escapable) / writer.string
local function citations(text_cites, raw_cites)
local function normalize(str)
if str == "" then
str = nil
else
str = (options.citationNbsps and parse_inlines_nbsp or
parse_inlines)(str)
end
return str
end
local cites = {}
for i = 1,#raw_cites,4 do
cites[#cites+1] = {
prenote = normalize(raw_cites[i]),
suppress_author = raw_cites[i+1] == "-",
name = writer.string(raw_cites[i+2]),
postnote = normalize(raw_cites[i+3]),
}
end
return writer.citations(text_cites, cites)
end
local TextCitations = Ct(Cc("")
* citation_name
* ((spnl
* lbracket
* citation_headless_body
* rbracket) + Cc(""))) /
function(raw_cites)
return citations(true, raw_cites)
end
local ParenthesizedCitations
= Ct(lbracket
* citation_body
* rbracket) /
function(raw_cites)
return citations(false, raw_cites)
end
local Citations = TextCitations + ParenthesizedCitations
local Block = V("Block")
local Verbatim = Cs( (blanklines
* ((indentedline - blankline))^1)^1
) / expandtabs / writer.verbatim
local TildeFencedCode
= fencehead(tilde)
* Cs(fencedline(tilde)^0)
* fencetail(tilde)
local BacktickFencedCode
= fencehead(backtick)
* Cs(fencedline(backtick)^0)
* fencetail(backtick)
local FencedCode = (TildeFencedCode + BacktickFencedCode)
/ function(infostring, code)
return writer.fencedCode(
writer.string(infostring),
expandtabs(code))
end
-- strip off leading > and indents, and run through blocks
local Blockquote = Cs((
((leader * more * space^-1)/"" * linechar^0 * newline)^1
* (-blankline * linechar^1 * newline)^0
* (blankline^0 / "")
)^1) / parse_blocks_toplevel / writer.blockquote
local function lineof(c)
return (leader * (P(c) * optionalspace)^3 * (newline * blankline^1
+ newline^-1 * eof))
end
local HorizontalRule = ( lineof(asterisk)
+ lineof(dash)
+ lineof(underscore)
) / writer.hrule
local starter = bullet + enumerator
-- we use \001 as a separator between a tight list item and a
-- nested list under it.
local NestedList = Cs((optionallyindentedline - starter)^1)
/ function(a) return "\001"..a end
local ListBlockLine = optionallyindentedline
- blankline - (indent^-1 * starter)
local ListBlock = line * ListBlockLine^0
local ListContinuationBlock = blanklines * (indent / "") * ListBlock
local function TightListItem(starter)
return -HorizontalRule
* (Cs(starter / "" * ListBlock * NestedList^-1) /
parse_blocks)
* -(blanklines * indent)
end
local function LooseListItem(starter)
return -HorizontalRule
* Cs( starter / "" * ListBlock * Cc("\n")
* (NestedList + ListContinuationBlock^0)
* (blanklines / "\n\n")
) / parse_blocks
end
local BulletList = ( Ct(TightListItem(bullet)^1)
* Cc(true) * skipblanklines * -bullet
+ Ct(LooseListItem(bullet)^1)
* Cc(false) * skipblanklines ) /
writer.bulletlist
local function orderedlist(items,tight,startNumber)
if options.startNumber then
startNumber = tonumber(startNumber) or 1 -- fallback for '#'
else
startNumber = nil
end
return writer.orderedlist(items,tight,startNumber)
end
local OrderedList = Cg(enumerator, "listtype") *
( Ct(TightListItem(Cb("listtype")) *
TightListItem(enumerator)^0)
* Cc(true) * skipblanklines * -enumerator
+ Ct(LooseListItem(Cb("listtype")) *
LooseListItem(enumerator)^0)
* Cc(false) * skipblanklines
) * Cb("listtype") / orderedlist
local defstartchar = S("~:")
local defstart = ( defstartchar * #spacing * (tab + space^-3)
+ space * defstartchar * #spacing * (tab + space^-2)
+ space * space * defstartchar * #spacing *
(tab + space^-1)
+ space * space * space * defstartchar * #spacing
)
local dlchunk = Cs(line * (indentedline - blankline)^0)
local function definition_list_item(term, defs, tight)
return { term = parse_inlines(term), definitions = defs }
end
local DefinitionListItemLoose = C(line) * skipblanklines
* Ct((defstart *
indented_blocks(dlchunk) /
parse_blocks_toplevel)^1)
* Cc(false)
/ definition_list_item
local DefinitionListItemTight = C(line)
* Ct((defstart * dlchunk /
parse_blocks)^1)
* Cc(true)
/ definition_list_item
local DefinitionList = ( Ct(DefinitionListItemLoose^1) * Cc(false)
+ Ct(DefinitionListItemTight^1)
* (skipblanklines *
-DefinitionListItemLoose * Cc(true))
) / writer.definitionlist
local Reference = define_reference_parser / register_link
local Blank = blankline / ""
+ NoteBlock
+ Reference
+ (tightblocksep / "\n")
local Paragraph = nonindentspace * Ct(Inline^1) * newline
* ( blankline^1
+ #hash
+ #(leader * more * space^-1)
)
/ writer.paragraph
local ToplevelParagraph
= nonindentspace * Ct(Inline^1) * (newline
* ( blankline^1
+ #hash
+ #(leader * more * space^-1)
+ eof
)
+ eof )
/ writer.paragraph
local Plain = nonindentspace * Ct(Inline^1) / writer.plain
-- parse Atx heading start and return level
local HeadingStart = #hash * C(hash^-6) * -hash / length
-- parse setext header ending and return level
local HeadingLevel = equal^1 * Cc(1) + dash^1 * Cc(2)
local function strip_atx_end(s)
return s:gsub("[#%s]*\n$","")
end
-- parse atx header
local AtxHeading = Cg(HeadingStart,"level")
* optionalspace
* (C(line) / strip_atx_end / parse_inlines)
* Cb("level")
/ writer.heading
-- parse setext header
local SetextHeading = #(line * S("=-"))
* Ct(line / parse_inlines)
* HeadingLevel
* optionalspace * newline
/ writer.heading
local Heading = AtxHeading + SetextHeading
syntax =
{ "Blocks",
Blocks = Blank^0 *
Block^-1 *
(Blank^0 / function()
return writer.interblocksep
end * Block)^0 *
Blank^0 *
eof,
Blank = Blank,
Block = V("Blockquote")
+ V("Verbatim")
+ V("FencedCode")
+ V("HorizontalRule")
+ V("BulletList")
+ V("OrderedList")
+ V("Heading")
+ V("DefinitionList")
+ V("Paragraph")
+ V("Plain"),
Blockquote = Blockquote,
Verbatim = Verbatim,
FencedCode = FencedCode,
HorizontalRule = HorizontalRule,
BulletList = BulletList,
OrderedList = OrderedList,
Heading = Heading,
DefinitionList = DefinitionList,
DisplayHtml = DisplayHtml,
Paragraph = Paragraph,
Plain = Plain,
Inline = V("Str")
+ V("Space")
+ V("Endline")
+ V("UlOrStarLine")
+ V("Strong")
+ V("Emph")
+ V("NoteRef")
+ V("Citations")
+ V("Link")
+ V("Image")
+ V("Code")
+ V("AutoLinkUrl")
+ V("AutoLinkEmail")
+ V("EscapedChar")
+ V("Smart")
+ V("Symbol"),
Str = Str,
Space = Space,
Endline = Endline,
UlOrStarLine = UlOrStarLine,
Strong = Strong,
Emph = Emph,
NoteRef = NoteRef,
Citations = Citations,
Link = Link,
Image = Image,
Code = Code,
AutoLinkUrl = AutoLinkUrl,
AutoLinkEmail = AutoLinkEmail,
InlineHtml = InlineHtml,
HtmlEntity = HtmlEntity,
EscapedChar = EscapedChar,
Smart = Smart,
Symbol = Symbol,
}
if not options.definitionLists then
syntax.DefinitionList = fail
end
if not options.fencedCode then
syntax.FencedCode = fail
end
if not options.citations then
syntax.Citations = fail
end
if not options.footnotes then
syntax.NoteRef = fail
end
if not options.smartEllipses then
syntax.Smart = fail
end
local blocks_toplevel_t = util.table_copy(syntax)
blocks_toplevel_t.Paragraph = ToplevelParagraph
blocks_toplevel = Ct(blocks_toplevel_t)
blocks = Ct(syntax)
local inlines_t = util.table_copy(syntax)
inlines_t[1] = "Inlines"
inlines_t.Inlines = Inline^0 * (spacing^0 * eof / "")
inlines = Ct(inlines_t)
local inlines_no_link_t = util.table_copy(inlines_t)
inlines_no_link_t.Link = fail
inlines_no_link = Ct(inlines_no_link_t)
local inlines_nbsp_t = util.table_copy(inlines_t)
inlines_nbsp_t.Endline = NonbreakingEndline
inlines_nbsp_t.Space = NonbreakingSpace
inlines_nbsp = Ct(inlines_nbsp_t)
function self.convert(input)
references = {}
local opt_string = {}
for k,_ in pairs(defaultOptions) do
local v = options[k]
if k ~= "cacheDir" then
opt_string[#opt_string+1] = k .. "=" .. tostring(v)
end
end
table.sort(opt_string)
local salt = table.concat(opt_string, ",") .. "," .. metadata.version
local name = util.cache(options.cacheDir, input, salt, function(input)
return util.rope_to_string(parse_blocks_toplevel(input)) .. writer.eof
end, ".md" .. writer.suffix)
return writer.pack(name)
end
return self
end
function M.new(options)
local writer = M.writer.new(options)
local reader = M.reader.new(writer, options)
return reader.convert
end
return M
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