11170735472

Committed 03 Oct 2024 10:32PM UTC coverage: 58.612% (-4.5%) from 63.103%

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Merge bcab25790 into 783083345

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/packages/math/texlike.lua

local syms = require("packages.math.unicode-symbols")
local bits = require("core.parserbits")

local epnf = require("epnf")
local lpeg = require("lpeg")

local atomType = syms.atomType
local symbolDefaults = syms.symbolDefaults
local symbols = syms.symbols

-- Grammar to parse TeX-like math
-- luacheck: push ignore
-- stylua: ignore start
---@diagnostic disable: undefined-global, unused-local, lowercase-global
local mathGrammar = function (_ENV)
   local _ = WS^0
   local eol = S"\r\n"
   local digit = R("09")
   local natural = digit^1 / tostring
   local pos_natural = R("19") * digit^0 / tonumber
   local ctrl_word = R("AZ", "az")^1
   local ctrl_symbol = P(1) - S"{}\\"
   local ctrl_sequence_name = C(ctrl_word + ctrl_symbol) / 1
   local comment = (
         P"%" *
         P(1-eol)^0 *
         eol^-1
      )
   local utf8cont = R("\128\191")
   local utf8code = lpeg.R("\0\127")
      + lpeg.R("\194\223") * utf8cont
      + lpeg.R("\224\239") * utf8cont * utf8cont
      + lpeg.R("\240\244") * utf8cont * utf8cont * utf8cont
   -- Identifiers inside \mo and \mi tags
   local sileID = C(bits.identifier + P(1)) / 1
   local mathMLID = (utf8code - S"\\{}%")^1 / function (...)
         local ret = ""
         local t = {...}
         for _,b in ipairs(t) do
         ret = ret .. b
         end
         return ret
      end
   local group = P"{" * V"mathlist" * (P"}" + E("`}` expected"))
   local element_no_infix =
      V"def" +
      V"command" +
      group +
      V"argument" +
      V"atom"
   local element =
      V"supsub" +
      V"subsup" +
      V"sup" +
      V"sub" +
      element_no_infix
   local sep = S",;" * _
   local quotedString = (P'"' * C((1-P'"')^1) * P'"')
   local value = ( quotedString + (1-S",;]")^1 )
   local pair = Cg(sileID * _ * "=" * _ * C(value)) * sep^-1 / function (...)
      local t = {...}; return t[1], t[#t]
   end
   local list = Cf(Ct"" * pair^0, rawset)
   local parameters = (
         P"[" *
         list *
         P"]"
      )^-1 / function (a)
            return type(a)=="table" and a or {}
         end
   local dim2_arg_inner = Ct(V"mathlist" * (P"&" * V"mathlist")^0) /
      function (t)
         t.id = "mathlist"
         return t
      end
   local dim2_arg =
      Cg(P"{" *
         dim2_arg_inner *
         (P"\\\\" * dim2_arg_inner)^1 *
         (P"}" + E("`}` expected"))
         ) / function (...)
            local t = {...}
            -- Remove the last mathlist if empty. This way,
            -- `inner1 \\ inner2 \\` is the same as `inner1 \\ inner2`.
            if not t[#t][1] or not t[#t][1][1] then table.remove(t) end
            return pl.utils.unpack(t)
         end

   local dim2_arg_inner = Ct(V"mathlist" * (P"&" * V"mathlist")^0) /
      function (t)
         t.id = "mathlist"
         return t
      end
   local dim2_arg =
      Cg(P"{" *
         dim2_arg_inner *
         (P"\\\\" * dim2_arg_inner)^1 *
         (P"}" + E("`}` expected"))
         ) / function (...)
         local t = {...}
         -- Remove the last mathlist if empty. This way,
         -- `inner1 \\ inner2 \\` is the same as `inner1 \\ inner2`.
         if not t[#t][1] or not t[#t][1][1] then table.remove(t) end
         return pl.utils.unpack(t)
         end

   START "math"
   math = V"mathlist" * EOF"Unexpected character at end of math code"
   mathlist = (comment + (WS * _) + element)^0
   supsub = element_no_infix * _ * P"^" * _ * element_no_infix * _ *
      P"_" * _ * element_no_infix
   subsup = element_no_infix * _ * P"_" * _ * element_no_infix * _ *
      P"^" * _ * element_no_infix
   sup = element_no_infix * _ * P"^" * _ * element_no_infix
   sub = element_no_infix * _ * P"_" * _ * element_no_infix
   atom = natural + C(utf8code - S"\\{}%^_&") +
      (P"\\{" + P"\\}") / function (s) return string.sub(s, -1) end
   command = (
         P"\\" *
         Cg(ctrl_sequence_name, "command") *
         Cg(parameters, "options") *
         (dim2_arg + group^0)
      )
   def = P"\\def" * _ * P"{" *
      Cg(ctrl_sequence_name, "command-name") * P"}" * _ *
      --P"[" * Cg(digit^1, "arity") * P"]" * _ *
      P"{" * V"mathlist" * P"}"
   argument = P"#" * Cg(pos_natural, "index")
end
-- luacheck: pop
-- stylua: ignore end
---@diagnostic enable: undefined-global, unused-local, lowercase-global

local mathParser = epnf.define(mathGrammar)

local commands = {}

-- A command type is a type for each argument it takes: either string or MathML
-- tree. If a command has no type, it is assumed to take only trees.
-- Tags like <mi>, <mo>, <mn> take a string, and this needs to be propagated in
-- commands that use them.

local objType = {
   tree = 1,
   str = 2,
}

local function inferArgTypes_aux (accumulator, typeRequired, body)
   if type(body) == "table" then
      if body.id == "argument" then
         local ret = accumulator
         table.insert(ret, body.index, typeRequired)
         return ret
      elseif body.id == "command" then
         if commands[body.command] then
            local cmdArgTypes = commands[body.command][1]
            if #cmdArgTypes ~= #body then
               SU.error(
                  "Wrong number of arguments ("
                     .. #body
                     .. ") for command "
                     .. body.command
                     .. " (should be "
                     .. #cmdArgTypes
                     .. ")"
               )
            else
               for i = 1, #cmdArgTypes do
                  accumulator = inferArgTypes_aux(accumulator, cmdArgTypes[i], body[i])
               end
            end
            return accumulator
         elseif body.command == "mi" or body.command == "mo" or body.command == "mn" then
            if #body ~= 1 then
               SU.error("Wrong number of arguments (" .. #body .. ") for command " .. body.command .. " (should be 1)")
            end
            accumulator = inferArgTypes_aux(accumulator, objType.str, body[1])
            return accumulator
         else
            -- Not a macro, recurse on children assuming tree type for all
            -- arguments
            for _, child in ipairs(body) do
               accumulator = inferArgTypes_aux(accumulator, objType.tree, child)
            end
            return accumulator
         end
      elseif body.id == "atom" then
         return accumulator
      else
         -- Simply recurse on children
         for _, child in ipairs(body) do
            accumulator = inferArgTypes_aux(accumulator, typeRequired, child)
         end
         return accumulator
      end
   else
      SU.error("invalid argument to inferArgTypes_aux")
   end
end

local inferArgTypes = function (body)
   return inferArgTypes_aux({}, objType.tree, body)
end

local function registerCommand (name, argTypes, func)
   commands[name] = { argTypes, func }
end

-- Computes func(func(... func(init, k1, v1), k2, v2)..., k_n, v_n), i.e. applies
-- func on every key-value pair in the table. Keys with numeric indices are
-- processed in order. This is an important property for MathML compilation below.
local function fold_pairs (func, table)
   local accumulator = {}
   for k, v in pl.utils.kpairs(table) do
      accumulator = func(v, k, accumulator)
   end
   for i, v in ipairs(table) do
      accumulator = func(v, i, accumulator)
   end
   return accumulator
end

local function forall (pred, list)
   for _, x in ipairs(list) do
      if not pred(x) then
         return false
      end
   end
   return true
end

local compileToStr = function (argEnv, mathlist)
   if #mathlist == 1 and mathlist.id == "atom" then
      -- List is a single atom
      return mathlist[1]
   elseif #mathlist == 1 and mathlist[1].id == "argument" then
      return argEnv[mathlist[1].index]
   elseif mathlist.id == "argument" then
      return argEnv[mathlist.index]
   else
      local ret = ""
      for _, elt in ipairs(mathlist) do
         if elt.id == "atom" then
            ret = ret .. elt[1]
         elseif elt.id == "command" and symbols[elt.command] then
            ret = ret .. symbols[elt.command]
         else
            SU.error("Encountered non-character token in command that takes a string")
         end
      end
      return ret
   end
end

local function compileToMathML_aux (_, arg_env, tree)
   if type(tree) == "string" then
      return tree
   end
   local function compile_and_insert (child, key, accumulator)
      if type(key) ~= "number" then
         accumulator[key] = child
         return accumulator
      -- Compile all children, except if this node is a macro definition (no
      -- evaluation "under lambda") or the application of a registered macro
      -- (since evaluating the nodes depends on the macro's signature, it is more
      -- complex and done below)..
      elseif tree.id == "def" or (tree.id == "command" and commands[tree.command]) then
         -- Conserve unevaluated child
         table.insert(accumulator, child)
      else
         -- Compile next child
         local comp = compileToMathML_aux(nil, arg_env, child)
         if comp then
            if comp.id == "wrapper" then
               -- Insert all children of the wrapper node
               for _, inner_child in ipairs(comp) do
                  table.insert(accumulator, inner_child)
               end
            else
               table.insert(accumulator, comp)
            end
         end
      end
      return accumulator
   end
   tree = fold_pairs(compile_and_insert, tree)
   if tree.id == "math" then
      tree.command = "math"
      -- If the outermost `mrow` contains only other `mrow`s, remove it
      -- (allowing vertical stacking).
      if forall(function (c)
         return c.command == "mrow"
      end, tree[1]) then
         tree[1].command = "math"
         return tree[1]
      end
   elseif tree.id == "mathlist" then
      -- Turn mathlist into `mrow` except if it has exactly one `mtr` or `mtd`
      -- child.
      -- Note that `def`s have already been compiled away at this point.
      if #tree == 1 and (tree[1].command == "mtr" or tree[1].command == "mtd") then
         return tree[1]
      else
         tree.command = "mrow"
      end
      tree.command = "mrow"
   elseif tree.id == "atom" then
      local codepoints = {}
      for _, cp in luautf8.codes(tree[1]) do
         table.insert(codepoints, cp)
      end
      local cp = codepoints[1]
      if
         #codepoints == 1
         and ( -- If length of UTF-8 string is 1
            cp >= SU.codepoint("A") and cp <= SU.codepoint("Z")
            or cp >= SU.codepoint("a") and cp <= SU.codepoint("z")
            or cp >= SU.codepoint("Α") and cp <= SU.codepoint("Ω")
            or cp >= SU.codepoint("α") and cp <= SU.codepoint("ω")
         )
      then
         tree.command = "mi"
      elseif lpeg.match(lpeg.R("09") ^ 1, tree[1]) then
         tree.command = "mn"
      else
         tree.command = "mo"
      end
      tree.options = {}
   -- Translate TeX-like sub/superscripts to `munderover` or `msubsup`,
   -- depending on whether the base is a big operator
   elseif tree.id == "sup" and tree[1].command == "mo" and tree[1].atom == atomType.bigOperator then
      tree.command = "mover"
   elseif tree.id == "sub" and tree[1].command == "mo" and symbolDefaults[tree[1][1]].atom == atomType.bigOperator then
      tree.command = "munder"
   elseif
      tree.id == "subsup"
      and tree[1].command == "mo"
      and symbolDefaults[tree[1][1]].atom == atomType.bigOperator
   then
      tree.command = "munderover"
   elseif
      tree.id == "supsub"
      and tree[1].command == "mo"
      and symbolDefaults[tree[1][1]].atom == atomType.bigOperator
   then
      tree.command = "munderover"
      local tmp = tree[2]
      tree[2] = tree[3]
      tree[3] = tmp
   elseif tree.id == "sup" then
      tree.command = "msup"
   elseif tree.id == "sub" then
      tree.command = "msub"
   elseif tree.id == "subsup" then
      tree.command = "msubsup"
   elseif tree.id == "supsub" then
      tree.command = "msubsup"
      local tmp = tree[2]
      tree[2] = tree[3]
      tree[3] = tmp
   elseif tree.id == "def" then
      local commandName = tree["command-name"]
      local argTypes = inferArgTypes(tree[1])
      registerCommand(commandName, argTypes, function (compiledArgs)
         return compileToMathML_aux(nil, compiledArgs, tree[1])
      end)
      return nil
   elseif tree.id == "command" and commands[tree.command] then
      local argTypes = commands[tree.command][1]
      local cmdFun = commands[tree.command][2]
      local applicationTree = tree
      local cmdName = tree.command
      if #applicationTree ~= #argTypes then
         SU.error(
            "Wrong number of arguments ("
               .. #applicationTree
               .. ") for command "
               .. cmdName
               .. " (should be "
               .. #argTypes
               .. ")"
         )
      end
      -- Compile every argument
      local compiledArgs = {}
      for i, arg in pairs(applicationTree) do
         if type(i) == "number" then
            if argTypes[i] == objType.tree then
               table.insert(compiledArgs, compileToMathML_aux(nil, arg_env, arg))
            else
               local x = compileToStr(arg_env, arg)
               table.insert(compiledArgs, x)
            end
         else
            -- Not an argument but an attribute. Add it to the compiled
            -- argument tree as-is
            compiledArgs[i] = applicationTree[i]
         end
      end
      local res = cmdFun(compiledArgs)
      if res.command == "mrow" then
         -- Mark the outer mrow to be unwrapped in the parent
         res.id = "wrapper"
      end
      return res
   elseif tree.id == "command" and symbols[tree.command] then
      local atom = { id = "atom", [1] = symbols[tree.command] }
      tree = compileToMathML_aux(nil, arg_env, atom)
   elseif tree.id == "argument" then
      if arg_env[tree.index] then
         return arg_env[tree.index]
      else
         SU.error("Argument #" .. tree.index .. " has escaped its scope (probably not fully applied command).")
      end
   end
   tree.id = nil
   return tree
end

local function printMathML (tree)
   if type(tree) == "string" then
      return tree
   end
   local result = "\\" .. tree.command
   if tree.options then
      local options = {}
      for k, v in pairs(tree.options) do
         table.insert(options, k .. "=" .. v)
      end
      if #options > 0 then
         result = result .. "[" .. table.concat(options, ", ") .. "]"
      end
   end
   if #tree > 0 then
      result = result .. "{"
      for _, child in ipairs(tree) do
         result = result .. printMathML(child)
      end
      result = result .. "}"
   end
   return result
end

local function compileToMathML (_, arg_env, tree)
   local result = compileToMathML_aux(_, arg_env, tree)
   SU.debug("texmath", function ()
      return "Resulting MathML: " .. printMathML(result)
   end)
   return result
end

local function convertTexlike (_, content)
   local ret = epnf.parsestring(mathParser, content[1])
   SU.debug("texmath", function ()
      return "Parsed TeX math: " .. pl.pretty.write(ret)
   end)
   return ret
end

registerCommand("%", {}, function ()
   return { "%", command = "mo", options = {} }
end)
registerCommand("mi", { [1] = objType.str }, function (x)
   return x
end)
registerCommand("mo", { [1] = objType.str }, function (x)
   return x
end)
registerCommand("mn", { [1] = objType.str }, function (x)
   return x
end)

compileToMathML(
   nil,
   {},
   convertTexlike(nil, {
      [==[
  \def{frac}{\mfrac{#1}{#2}}
  \def{sqrt}{\msqrt{#1}}
  \def{bi}{\mi[mathvariant=bold-italic]{#1}}
  \def{dsi}{\mi[mathvariant=double-struck]{#1}}

  % Standard spaces gleaned from plain TeX
  \def{thinspace}{\mspace[width=thin]}
  \def{negthinspace}{\mspace[width=-thin]}
  \def{,}{\thinspace}
  \def{!}{\negthinspace}
  \def{medspace}{\mspace[width=med]}
  \def{negmedspace}{\mspace[width=-med]}
  \def{>}{\medspace}
  \def{thickspace}{\mspace[width=thick]}
  \def{negthickspace}{\mspace[width=-thick]}
  \def{;}{\thickspace}
  \def{enspace}{\mspace[width=1en]}
  \def{enskip}{\enspace}
  \def{quad}{\mspace[width=1em]}
  \def{qquad}{\mspace[width=2em]}

  % Modulus operator forms
  \def{bmod}{\mo{mod}}
  \def{pmod}{\quad(\mo{mod} #1)}
]==],
   })
)

return { convertTexlike, compileToMathML }

1	local syms = require("packages.math.unicode-symbols")	9✔
2	local bits = require("core.parserbits")	9✔
3
4	local epnf = require("epnf")	9✔
5	local lpeg = require("lpeg")	9✔
6
7	local atomType = syms.atomType	9✔
8	local symbolDefaults = syms.symbolDefaults	9✔
9	local symbols = syms.symbols	9✔
10
11	-- Grammar to parse TeX-like math
12	-- luacheck: push ignore
13	-- stylua: ignore start
14	---@diagnostic disable: undefined-global, unused-local, lowercase-global
15	local mathGrammar = function (_ENV)
16	local _ = WS^0	9✔
17	local eol = S"\r\n"	9✔
18	local digit = R("09")	9✔
19	local natural = digit^1 / tostring	9✔
20	local pos_natural = R("19") * digit^0 / tonumber	9✔
21	local ctrl_word = R("AZ", "az")^1	9✔
22	local ctrl_symbol = P(1) - S"{}\\"	9✔
23	local ctrl_sequence_name = C(ctrl_word + ctrl_symbol) / 1	9✔
24	local comment = (
25	P"%" *	9✔
26	P(1-eol)^0 *	9✔
27	eol^-1	9✔
28	)
29	local utf8cont = R("\128\191")	9✔
30	local utf8code = lpeg.R("\0\127")	9✔
31	+ lpeg.R("\194\223") * utf8cont	9✔
32	+ lpeg.R("\224\239") * utf8cont * utf8cont	9✔
33	+ lpeg.R("\240\244") * utf8cont * utf8cont * utf8cont	9✔
34	-- Identifiers inside \mo and \mi tags
35	local sileID = C(bits.identifier + P(1)) / 1	9✔
36	local mathMLID = (utf8code - S"\\{}%")^1 / function (...)	9✔
37	local ret = ""	×
38	local t = {...}	×
39	for _,b in ipairs(t) do	×
40	ret = ret .. b	×
41	end
42	return ret	×
43	end
44	local group = P"{" * V"mathlist" * (P"}" + E("`}` expected"))	18✔
45	local element_no_infix =
46	V"def" +	9✔
47	V"command" +	9✔
48	group +	9✔
49	V"argument" +	9✔
50	V"atom"	9✔
51	local element =
52	V"supsub" +	9✔
53	V"subsup" +	9✔
54	V"sup" +	9✔
55	V"sub" +	9✔
56	element_no_infix	9✔
57	local sep = S",;" * _	9✔
58	local quotedString = (P'"' * C((1-P'"')^1) * P'"')	9✔
59	local value = ( quotedString + (1-S",;]")^1 )	9✔
60	local pair = Cg(sileID * _ * "=" * _ * C(value)) * sep^-1 / function (...)	9✔
61	local t = {...}; return t[1], t[#t]	125✔
62	end
63	local list = Cf(Ct"" * pair^0, rawset)	9✔
64	local parameters = (
65	P"[" *	9✔
66	list *	9✔
67	P"]"	9✔
68	)^-1 / function (a)	9✔
69	return type(a)=="table" and a or {}	413✔
70	end
71	local dim2_arg_inner = Ct(V"mathlist" * (P"&" * V"mathlist")^0) /	9✔
72	function (t)
73	t.id = "mathlist"	×
74	return t	×
75	end
76	local dim2_arg =
77	Cg(P"{" *	18✔
78	dim2_arg_inner *	9✔
79	(P"\\\\" * dim2_arg_inner)^1 *	9✔
80	(P"}" + E("`}` expected"))	18✔
81	) / function (...)	×
82	local t = {...}	×
83	-- Remove the last mathlist if empty. This way,
84	-- `inner1 \\ inner2 \\` is the same as `inner1 \\ inner2`.
85	if not t[#t][1] or not t[#t][1][1] then table.remove(t) end	×
86	return pl.utils.unpack(t)	×
87	end
88
89	local dim2_arg_inner = Ct(V"mathlist" * (P"&" * V"mathlist")^0) /	9✔
90	function (t)
91	t.id = "mathlist"	16✔
92	return t	16✔
93	end
94	local dim2_arg =
95	Cg(P"{" *	18✔
96	dim2_arg_inner *	9✔
97	(P"\\\\" * dim2_arg_inner)^1 *	9✔
98	(P"}" + E("`}` expected"))	18✔
99	) / function (...)	×
100	local t = {...}	4✔
101	-- Remove the last mathlist if empty. This way,
102	-- `inner1 \\ inner2 \\` is the same as `inner1 \\ inner2`.
103	if not t[#t][1] or not t[#t][1][1] then table.remove(t) end	4✔
104	return pl.utils.unpack(t)	4✔
105	end
106
107	START "math"	9✔
108	math = V"mathlist" * EOF"Unexpected character at end of math code"	18✔
109	mathlist = (comment + (WS * _) + element)^0	9✔
110	supsub = element_no_infix * _ * P"^" * _ * element_no_infix * _ *	9✔
111	P"_" * _ * element_no_infix	9✔
112	subsup = element_no_infix * _ * P"_" * _ * element_no_infix * _ *	9✔
113	P"^" * _ * element_no_infix	9✔
114	sup = element_no_infix * _ * P"^" * _ * element_no_infix	9✔
115	sub = element_no_infix * _ * P"_" * _ * element_no_infix	9✔
116	atom = natural + C(utf8code - S"\\{}%^_&") +	9✔
117	(P"\\{" + P"\\}") / function (s) return string.sub(s, -1) end	9✔
118	command = (	×
119	P"\\" *	9✔
120	Cg(ctrl_sequence_name, "command") *	9✔
121	Cg(parameters, "options") *	9✔
122	(dim2_arg + group^0)	9✔
123	)	9✔
124	def = P"\\def" * _ * P"{" *	9✔
125	Cg(ctrl_sequence_name, "command-name") * P"}" * _ *	9✔
126	--P"[" * Cg(digit^1, "arity") * P"]" * _ *
127	P"{" * V"mathlist" * P"}"	9✔
128	argument = P"#" * Cg(pos_natural, "index")	9✔
129	end
130	-- luacheck: pop
131	-- stylua: ignore end
132	---@diagnostic enable: undefined-global, unused-local, lowercase-global
133
134	local mathParser = epnf.define(mathGrammar)	9✔
135
136	local commands = {}	9✔
137
138	-- A command type is a type for each argument it takes: either string or MathML
139	-- tree. If a command has no type, it is assumed to take only trees.
140	-- Tags like <mi>, <mo>, <mn> take a string, and this needs to be propagated in
141	-- commands that use them.
142
143	local objType = {	9✔
144	tree = 1,
145	str = 2,
146	}
147
148	local function inferArgTypes_aux (accumulator, typeRequired, body)
149	if type(body) == "table" then	571✔
150	if body.id == "argument" then	571✔
151	local ret = accumulator	54✔
152	table.insert(ret, body.index, typeRequired)	54✔
153	return ret	54✔
154	elseif body.id == "command" then	517✔
155	if commands[body.command] then	192✔
156	local cmdArgTypes = commands[body.command][1]	93✔
157	if #cmdArgTypes ~= #body then	93✔
158	SU.error(	×
159	"Wrong number of arguments ("
160	.. #body	×
161	.. ") for command "	×
162	.. body.command	×
163	.. " (should be "	×
164	.. #cmdArgTypes	×
165	.. ")"	×
166	)
167	else
168	for i = 1, #cmdArgTypes do	132✔
169	accumulator = inferArgTypes_aux(accumulator, cmdArgTypes[i], body[i])	78✔
170	end
171	end
172	return accumulator	93✔
173	elseif body.command == "mi" or body.command == "mo" or body.command == "mn" then	99✔
174	if #body ~= 1 then	×
175	SU.error("Wrong number of arguments (" .. #body .. ") for command " .. body.command .. " (should be 1)")	×
176	end
177	accumulator = inferArgTypes_aux(accumulator, objType.str, body[1])	×
178	return accumulator	×
179	else
180	-- Not a macro, recurse on children assuming tree type for all
181	-- arguments
182	for _, child in ipairs(body) do	126✔
183	accumulator = inferArgTypes_aux(accumulator, objType.tree, child)	54✔
184	end
185	return accumulator	99✔
186	end
187	elseif body.id == "atom" then	325✔
188	return accumulator	76✔
189	else
190	-- Simply recurse on children
191	for _, child in ipairs(body) do	571✔
192	accumulator = inferArgTypes_aux(accumulator, typeRequired, child)	644✔
193	end
194	return accumulator	249✔
195	end
196	else
197	SU.error("invalid argument to inferArgTypes_aux")	×
198	end
199	end
200
201	local inferArgTypes = function (body)
202	return inferArgTypes_aux({}, objType.tree, body)	183✔
203	end
204
205	local function registerCommand (name, argTypes, func)
206	commands[name] = { argTypes, func }	219✔
207	end
208
209	-- Computes func(func(... func(init, k1, v1), k2, v2)..., k_n, v_n), i.e. applies
210	-- func on every key-value pair in the table. Keys with numeric indices are
211	-- processed in order. This is an important property for MathML compilation below.
212	local function fold_pairs (func, table)
213	local accumulator = {}	1,242✔
214	for k, v in pl.utils.kpairs(table) do	10,234✔
215	accumulator = func(v, k, accumulator)	6,508✔
216	end
217	for i, v in ipairs(table) do	2,939✔
218	accumulator = func(v, i, accumulator)	3,394✔
219	end
220	return accumulator	1,242✔
221	end
222
223	local function forall (pred, list)
224	for _, x in ipairs(list) do	46✔
225	if not pred(x) then	74✔
226	return false	37✔
227	end
228	end
229	return true	9✔
230	end
231
232	local compileToStr = function (argEnv, mathlist)
233	if #mathlist == 1 and mathlist.id == "atom" then	100✔
234	-- List is a single atom
235	return mathlist[1]	×
236	elseif #mathlist == 1 and mathlist[1].id == "argument" then	100✔
UNCOV 237	return argEnv[mathlist[1].index]	×
238	elseif mathlist.id == "argument" then	100✔
239	return argEnv[mathlist.index]	×
240	else
241	local ret = ""	100✔
242	for _, elt in ipairs(mathlist) do	410✔
243	if elt.id == "atom" then	310✔
244	ret = ret .. elt[1]	310✔
245	elseif elt.id == "command" and symbols[elt.command] then	×
246	ret = ret .. symbols[elt.command]	×
247	else
248	SU.error("Encountered non-character token in command that takes a string")	×
249	end
250	end
251	return ret	100✔
252	end
253	end
254
255	local function compileToMathML_aux (_, arg_env, tree)
256	if type(tree) == "string" then	1,587✔
257	return tree	345✔
258	end
259	local function compile_and_insert (child, key, accumulator)
260	if type(key) ~= "number" then	4,951✔
261	accumulator[key] = child	3,254✔
262	return accumulator	3,254✔
263	-- Compile all children, except if this node is a macro definition (no
264	-- evaluation "under lambda") or the application of a registered macro
265	-- (since evaluating the nodes depends on the macro's signature, it is more
266	-- complex and done below)..
267	elseif tree.id == "def" or (tree.id == "command" and commands[tree.command]) then	1,697✔
268	-- Conserve unevaluated child
269	table.insert(accumulator, child)	316✔
270	else
271	-- Compile next child
272	local comp = compileToMathML_aux(nil, arg_env, child)	1,381✔
273	if comp then	1,381✔
274	if comp.id == "wrapper" then	1,198✔
275	-- Insert all children of the wrapper node
276	for _, inner_child in ipairs(comp) do	170✔
277	table.insert(accumulator, inner_child)	87✔
278	end
279	else
280	table.insert(accumulator, comp)	1,115✔
281	end
282	end
283	end
284	return accumulator	1,697✔
285	end
286	tree = fold_pairs(compile_and_insert, tree)	2,484✔
287	if tree.id == "math" then	1,242✔
288	tree.command = "math"	46✔
289	-- If the outermost `mrow` contains only other `mrow`s, remove it
290	-- (allowing vertical stacking).
291	if forall(function (c)	92✔
292	return c.command == "mrow"	37✔
293	end, tree[1]) then	92✔
294	tree[1].command = "math"	9✔
295	return tree[1]	9✔
296	end
297	elseif tree.id == "mathlist" then	1,196✔
298	-- Turn mathlist into `mrow` except if it has exactly one `mtr` or `mtd`
299	-- child.
300	-- Note that `def`s have already been compiled away at this point.
301	if #tree == 1 and (tree[1].command == "mtr" or tree[1].command == "mtd") then	278✔
302	return tree[1]	×
303	else
304	tree.command = "mrow"	278✔
305	end
306	tree.command = "mrow"	278✔
307	elseif tree.id == "atom" then	918✔
308	local codepoints = {}	345✔
309	for _, cp in luautf8.codes(tree[1]) do	702✔
310	table.insert(codepoints, cp)	357✔
311	end
312	local cp = codepoints[1]	345✔
313	if
314	#codepoints == 1	345✔
315	and ( -- If length of UTF-8 string is 1	×
316	cp >= SU.codepoint("A") and cp <= SU.codepoint("Z")	811✔
317	or cp >= SU.codepoint("a") and cp <= SU.codepoint("z")	793✔
318	or cp >= SU.codepoint("Α") and cp <= SU.codepoint("Ω")	523✔
319	or cp >= SU.codepoint("α") and cp <= SU.codepoint("ω")	517✔
320	)
321	then
322	tree.command = "mi"	108✔
323	elseif lpeg.match(lpeg.R("09") ^ 1, tree[1]) then	237✔
324	tree.command = "mn"	100✔
325	else
326	tree.command = "mo"	137✔
327	end
328	tree.options = {}	345✔
329	-- Translate TeX-like sub/superscripts to `munderover` or `msubsup`,
330	-- depending on whether the base is a big operator
331	elseif tree.id == "sup" and tree[1].command == "mo" and tree[1].atom == atomType.bigOperator then	573✔
332	tree.command = "mover"	×
333	elseif tree.id == "sub" and tree[1].command == "mo" and symbolDefaults[tree[1][1]].atom == atomType.bigOperator then	573✔
UNCOV 334	tree.command = "munder"	×
335	elseif	×
336	tree.id == "subsup"	573✔
337	and tree[1].command == "mo"	14✔
338	and symbolDefaults[tree[1][1]].atom == atomType.bigOperator	10✔
339	then
340	tree.command = "munderover"	8✔
341	elseif	×
342	tree.id == "supsub"	565✔
343	and tree[1].command == "mo"	×
344	and symbolDefaults[tree[1][1]].atom == atomType.bigOperator	×
345	then
346	tree.command = "munderover"	×
347	local tmp = tree[2]	×
348	tree[2] = tree[3]	×
349	tree[3] = tmp	×
350	elseif tree.id == "sup" then	565✔
351	tree.command = "msup"	10✔
352	elseif tree.id == "sub" then	555✔
353	tree.command = "msub"	28✔
354	elseif tree.id == "subsup" then	527✔
355	tree.command = "msubsup"	6✔
356	elseif tree.id == "supsub" then	521✔
357	tree.command = "msubsup"	×
358	local tmp = tree[2]	×
359	tree[2] = tree[3]	×
360	tree[3] = tmp	×
361	elseif tree.id == "def" then	521✔
362	local commandName = tree["command-name"]	183✔
363	local argTypes = inferArgTypes(tree[1])	183✔
364	registerCommand(commandName, argTypes, function (compiledArgs)	366✔
365	return compileToMathML_aux(nil, compiledArgs, tree[1])	83✔
366	end)
367	return nil	183✔
368	elseif tree.id == "command" and commands[tree.command] then	338✔
369	local argTypes = commands[tree.command][1]	184✔
370	local cmdFun = commands[tree.command][2]	184✔
371	local applicationTree = tree	184✔
372	local cmdName = tree.command	184✔
373	if #applicationTree ~= #argTypes then	184✔
374	SU.error(	×
375	"Wrong number of arguments ("
376	.. #applicationTree	×
377	.. ") for command "	×
378	.. cmdName	×
379	.. " (should be "	×
380	.. #argTypes	×
381	.. ")"	×
382	)
383	end
384	-- Compile every argument
385	local compiledArgs = {}	184✔
386	for i, arg in pairs(applicationTree) do	1,053✔
387	if type(i) == "number" then	869✔
388	if argTypes[i] == objType.tree then	133✔
389	table.insert(compiledArgs, compileToMathML_aux(nil, arg_env, arg))	66✔
390	else
391	local x = compileToStr(arg_env, arg)	100✔
392	table.insert(compiledArgs, x)	100✔
393	end
394	else
395	-- Not an argument but an attribute. Add it to the compiled
396	-- argument tree as-is
397	compiledArgs[i] = applicationTree[i]	736✔
398	end
399	end
400	local res = cmdFun(compiledArgs)	184✔
401	if res.command == "mrow" then	184✔
402	-- Mark the outer mrow to be unwrapped in the parent
403	res.id = "wrapper"	83✔
404	end
405	return res	184✔
406	elseif tree.id == "command" and symbols[tree.command] then	154✔
407	local atom = { id = "atom", [1] = symbols[tree.command] }	44✔
408	tree = compileToMathML_aux(nil, arg_env, atom)	88✔
409	elseif tree.id == "argument" then	110✔
410	if arg_env[tree.index] then	33✔
411	return arg_env[tree.index]	33✔
412	else
413	SU.error("Argument #" .. tree.index .. " has escaped its scope (probably not fully applied command).")	×
414	end
415	end
416	tree.id = nil	833✔
417	return tree	833✔
418	end
419
420	local function printMathML (tree)
421	if type(tree) == "string" then	×
422	return tree	×
423	end
424	local result = "\\" .. tree.command	×
425	if tree.options then	×
426	local options = {}	×
427	for k, v in pairs(tree.options) do	×
428	table.insert(options, k .. "=" .. v)	×
429	end
430	if #options > 0 then	×
431	result = result .. "[" .. table.concat(options, ", ") .. "]"	×
432	end
433	end
434	if #tree > 0 then	×
435	result = result .. "{"	×
436	for _, child in ipairs(tree) do	×
437	result = result .. printMathML(child)	×
438	end
439	result = result .. "}"	×
440	end
441	return result	×
442	end
443
444	local function compileToMathML (_, arg_env, tree)
445	local result = compileToMathML_aux(_, arg_env, tree)	46✔
446	SU.debug("texmath", function ()	92✔
447	return "Resulting MathML: " .. printMathML(result)	×
448	end)
449	return result	46✔
450	end
451
452	local function convertTexlike (_, content)
453	local ret = epnf.parsestring(mathParser, content[1])	46✔
454	SU.debug("texmath", function ()	92✔
455	return "Parsed TeX math: " .. pl.pretty.write(ret)	×
456	end)
457	return ret	46✔
458	end
459
460	registerCommand("%", {}, function ()	18✔
461	return { "%", command = "mo", options = {} }	1✔
462	end)
463	registerCommand("mi", { [1] = objType.str }, function (x)	18✔
464	return x	85✔
465	end)
466	registerCommand("mo", { [1] = objType.str }, function (x)	18✔
467	return x	15✔
468	end)
469	registerCommand("mn", { [1] = objType.str }, function (x)	18✔
UNCOV 470	return x	×
471	end)
472
473	compileToMathML(	18✔
474	nil,	9✔
475	{},
476	convertTexlike(nil, {	9✔
477	[==[	×
478	\def{frac}{\mfrac{#1}{#2}}
479	\def{sqrt}{\msqrt{#1}}
480	\def{bi}{\mi[mathvariant=bold-italic]{#1}}
481	\def{dsi}{\mi[mathvariant=double-struck]{#1}}
482
483	% Standard spaces gleaned from plain TeX
484	\def{thinspace}{\mspace[width=thin]}
485	\def{negthinspace}{\mspace[width=-thin]}
486	\def{,}{\thinspace}
487	\def{!}{\negthinspace}
488	\def{medspace}{\mspace[width=med]}
489	\def{negmedspace}{\mspace[width=-med]}
490	\def{>}{\medspace}
491	\def{thickspace}{\mspace[width=thick]}
492	\def{negthickspace}{\mspace[width=-thick]}
493	\def{;}{\thickspace}
494	\def{enspace}{\mspace[width=1en]}
495	\def{enskip}{\enspace}
496	\def{quad}{\mspace[width=1em]}
497	\def{qquad}{\mspace[width=2em]}
498
499	% Modulus operator forms
500	\def{bmod}{\mo{mod}}
501	\def{pmod}{\quad(\mo{mod} #1)}
502	]==],
503	})
504	)
505
506	return { convertTexlike, compileToMathML }	9✔

sile-typesetter / sile / 11170735472

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