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Support Unicode colon equals#1151

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edemaine merged 2 commits intoKaTeX:masterfrom
ronkok:colonequals
Feb 9, 2018
Merged

Support Unicode colon equals#1151
edemaine merged 2 commits intoKaTeX:masterfrom
ronkok:colonequals

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@ronkok ronkok commented Feb 9, 2018

This PR adds support for three Unicode characters:

This PR adds support for three Unicode characters: `≔` `≕` `⩴`
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codecov bot commented Feb 9, 2018

Codecov Report

Merging #1151 into master will increase coverage by 0.06%.
The diff coverage is 100%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master    #1151      +/-   ##
==========================================
+ Coverage   78.95%   79.01%   +0.06%     
==========================================
  Files          59       59              
  Lines        3872     3875       +3     
  Branches      655      655              
==========================================
+ Hits         3057     3062       +5     
+ Misses        674      672       -2     
  Partials      141      141
Impacted Files Coverage Δ
src/macros.js 82.6% <100%> (+0.38%) ⬆️
src/functions.js 87.03% <0%> (+3.7%) ⬆️

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ronkok commented Feb 9, 2018

I withheld these characters from PR #933 because three packages address these characters and they all disagree on the alias.

Character Code Point mathtools and KaTeX colonequals and KaTeX unicode-math
U+2254 \coloneqq \colonequals \coloneq
U+2255 \eqqcolon \equalscolon \eqcolon
U+2A74 \Coloneqq \equalscoloncolon \Coloneq

Not only that, but the Unicode math aliases are used by mathtools to render a different character.

Alias unicode-math mathtools and KaTeX
\coloneq :−
\eqcolon −:
\Coloneq ::−

I have said in earlier PRs that for Unicode support, the internal alias is only a means, not an end. What matters is that the author must get the results desired from the input of a specific Unicode character. That is still true, so I have implemented these Unicode characters by writing macros that call the mathtools aliases.

It’s a good thing that those internal aliases don’t really matter. This could have been ugly.

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ronkok commented Feb 9, 2018

Visual confirmation:
colonequals

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Great work as usual!

@edemaine edemaine merged commit d80be86 into KaTeX:master Feb 9, 2018
@ronkok ronkok deleted the colonequals branch February 20, 2018 18:55
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3 participants