14510870853

Committed 17 Apr 2025 07:55AM UTC coverage: 31.472% (-25.8%) from 57.267%

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Merge pull request #2267 from Omikhleia/feat-csl-position

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4871 existing lines in 34 files now uncovered.

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/packages/math/unicode-accents.lua

1	-- IMPORTANT:
2	-- Normally, if we were to take MathML seriously, we would have to use the Unicode combining characters
3	-- for accents, using reverse mapping tables.
4	-- So our current implementation here is not fully compliant, but the whole thing is a hornet's nest.
5
6	-- Combining character check by Unicode block
7	-- @tparam number codepoint A Unicode codepoint
8	-- @treturn boolean true if the codepoint is a combining character, false otherwise
9	local isCombining = function (codepoint)
10	return	×
11	-- Combining Diacritical Marks (0300–036F), since version 1.0, with modifications in subsequent versions down to 4.1
UNCOV 12	(codepoint >= 0x0300 and codepoint <= 0x036F)	×
13	-- Combining Diacritical Marks Extended (1AB0–1AFF), version 7.0
UNCOV 14	or (codepoint >= 0x1AB0 and codepoint <= 0x1AFF)	×
15	-- Combining Diacritical Marks Supplement (1DC0–1DFF), versions 4.1 to 5.2
UNCOV 16	or (codepoint >= 0x1DC0 and codepoint <= 0x1DFF)	×
17	-- Combining Diacritical Marks for Symbols (20D0–20FF), since version 1.0, with modifications in subsequent versions down to 5.1
UNCOV 18	or (codepoint >= 0x20D0 and codepoint <= 0x20FF)	×
19	-- Cyrillic Extended-A (2DE0–2DFF), version 5.1
UNCOV 20	or (codepoint >= 0x2DE0 and codepoint <= 0x2DFF)	×
21	-- Combining Half Marks (FE20–FE2F), versions 1.0, with modifications in subsequent versions down to 8.0
UNCOV 22	or (codepoint >= 0xFE20 and codepoint <= 0xFE2F)	×
UNCOV 23	or false	×
24	end
25
26	-- MathML Core non-normative B.3 (https://www.w3.org/TR/mathml-core/#comb-noncomb)
27	-- W3C Working Draft 27 November 2023, and MathML Core Editor's Draft 26 November 2024 as well:
28	-- The table does not seem complete, see ADDED comments below so that we can map TeX atoms
29	-- accent and bottaccent atoms to non-combining characters...
30	-- For the ADDED stuff, see report https://github.com/w3c/mathml-core/issues/137#issuecomment-2508344714
31	-- See also https://github.com/w3c/mathml/issues/247 on a related issue.
32	-- Grumpy none: All these standards put together are defective by design.
UNCOV 33	local nonCombining = {	×
34	-- Combining Diacritical Marks (0300–036F)
35	[0x0300] = 0x0060, -- combining grave accent (above) > grave accent
36	[0x0301] = 0x00B4, -- combining acute accent (above) > acute accent
37	[0x0302] = 0x02C6, -- combining circumflex accent (above) > modifier letter circumflex accent
38	[0x0303] = 0x007E, -- combining tilde (above) > tilde
39	[0x0304] = 0x00AF, -- combining macron (above) > macron
40	[0x0305] = 0x203E, -- combining overline (above) > overline
41	[0x0306] = 0x02D8, -- combining breve (above) > breve
42	[0x0307] = 0x02D9, -- combining dot (above) > dot above
43	[0x0308] = 0x00A8, -- combining diaeresis (above) > diaeresis
44	[0x030A] = 0x02DA, -- combining ring above > ring above (ADDED)
45	[0x030B] = 0x02DD, -- combining double acute accent (above) > double acute accent
46	[0x030C] = 0x02C7, -- combining caron (above) > caron
47	-- [0x0311] (accent in unicode-math) combining inverted breve (above) has no safe non-combining equivalent
48	[0x0312] = 0x00B8, -- combining comma (above) > cedilla
49	[0x0316] = 0x0060, -- combining grave accent (below) > grave accent
50	[0x0317] = 0x00B4, -- combining acute accent (below) > acute accent
51	[0x031F] = 0x002B, -- combingin plus sign (below) > plus sign
52	[0x0320] = 0x002D, -- combining minus sign (below) > minus sign
53	[0x0323] = 0x002E, -- combining dot (below) > full stop
54	[0x0324] = 0x00A8, -- combining diaeresis (below) > diaeresis
55	[0x0327] = 0x00B8, -- combining cedilla (below) > cedilla
56	[0x0328] = 0x02DB, -- combining ogonek (below) > ogonek
57	[0x032C] = 0x02C7, -- combining caron (below) > caron
58	[0x032D] = 0x005E, -- circumflex accent below
59	[0x032E] = 0x02D8, -- combining breve (below) > breve
60	-- [0x032F] (botaccent is unicode-math) combining inverted breve (below) has no safe non-combining equivalent
61	[0x0330] = 0x007E, -- combining tilde (below) > tilde
62	[0x0331] = 0x00AF, -- combining macron (below) > macron (ADDED)
63	[0x0332] = 0x203E, -- combining low line (below) > overline
64	[0x0333] = 0x2017, -- combining double low line (below) > double low line (ADDED)
65	[0x0338] = 0x002F, -- combining long solidus overlay (over) > solidus
66	-- [0x033A] (botaccent is unicode-math) combining inverted bridge below has no safe non-combining equivalent
67	-- [0x033F] (accent in unicode-math) combining double overline has no safe non-combining equivalent
68	-- [0x0346] (accent in unicode-math) combining bridge above has no safe non-combining equivalent
69	[0x034D] = 0x2194, -- combining left-right arrow (below) > left right arrow (ADDED)
70	--Combining Diacritical Marks for Symbols (20D0–20FF)
71	[0x20D0] = 0x21BC, -- combining left harpoon (above) > leftwards harpoon with barb up (ADDED)
72	[0x20D1] = 0x21C0, -- combining right harpoon (above) > rightwards harpoon with barb up (ADDED)
73	-- [0x20D4] (accent in unicode-math) combining anticlockwise arrow above has no safe non-combining equivalent
74	-- [0x20D5] (accent in unicode-math) combining clockwise arrow above has no safe non-combining equivalent
75	[0x20D6] = 0x2190, -- combining left arrow (above) > left arrow [or U+27F5 long leftwards arrow?] (ADDED)
76	[0x20D7] = 0x2192, -- combining right arrow (above) > right arrow [or U+27F6 long rightwards arrow?]
77	[0x20DB] = 0x22EF, -- combining triple underdot (above) > midline horizontal ellipsis (ADDED, LIKELY IMPERFECT)
78	--[0x20DC] (accent in unicode-math) combining four dots above has no safe non-combining equivalent
79	[0x20E1] = 0x2194, -- combining left right arrow above > left right arrow (ADDED)
80	-- [0x20E7] (botaccent is unicode-math) combining annuity symbol has no safe non-combining equivalent
81	[0x20E8] = 0x22EF, -- combining triple underdot (below) > midline horizontal ellipsis (ADDED, LIKELY IMPERFECT)
82	-- [0x20E9] (botaccent is unicode-math) combining wide bridge above has no safe non-combining equivalent
83	[0x20EC] = 0x21C1, -- combining rightwards harpoon with barb downwards > rightwards harpoon with barb downwards (ADDED)
84	[0x20ED] = 0x21BD, -- combining leftwards harpoon with bard downwards > leftwards harpoon with barb downwards (ADDED)
85	[0x20EE] = 0x2190, -- combining left arrow (below) > left arrow [or U+27F5 long leftwards arrow?] (ADDED)
86	[0x20EF] = 0x2192, -- combining right arrow (below) > right arrow [or U+27F6 long rightwards arrow?]
87	}
88
89	-- Make a non-combining equivalent of a combining character
90	-- @tparam string char A single-character string representing a combining character
91	-- @treturn string A single-character string representing the non-combining equivalent
92	local function makeNonCombining (char)
UNCOV 93	local codepoint = luautf8.codepoint(char, 1)	×
UNCOV 94	if isCombining(codepoint) then	×
95	local noncombining = nonCombining[codepoint]	×
96	if noncombining then	×
97	return luautf8.char(noncombining)	×
98	end
99	SU.warn(("No non-combining equivalent for codepoint 0x%x"):format(codepoint))	×
100	end
UNCOV 101	return char	×
102	end
103
UNCOV 104	return {	×
105	isCombining = isCombining,
106	makeNonCombining = makeNonCombining,
107	}

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