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fix(math): Properly handle empty final line in TeX-like math tables w… #2306

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fix(math): Properly handle empty final line in TeX-like math tables w… #2306

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28 changes: 7 additions & 21 deletions packages/math/texlike.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -150,30 +150,16 @@ local mathGrammar = function (_ENV)
(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
local last = t[#t]
-- Remove the last element if empty:
-- So that `inner1 \\ inner2 \\` is the same as `inner1 \\ inner2`.
if #last == 0 or (#last == 1 and #last[#last] == 0) then
-- Empty mathlist, or mathlist containing a single empty mathlist.
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

-- TeX uses the regular asterisk (* = U+002A) in superscripts or subscript:
-- The TeXbook exercice 18.32 (p. 179, 330) for instance.
-- Fonts usually have the asterisk raised too high, so using the Unicode
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