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\@binrel command and refactor (#1487)

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* \@binrel command and refactor

New `\@binrel{x}{y}` command renders `y` as if it's a bin/rel/ord like `x`.
This is equivalent to AMSTeX's `\binrel@{x}\binrel@@{y}`.
It will hopefully be useful for macros, such as `\pmb` (#1418).

Also refactor the (already duplicated) code for implementing this
functionality into buildCommon.binrelClass.

* Add tests; fix flow error

* Another test

* Move binrelClass to functions/mclass.js

* Remove expensive array destructuring polyfill
This commit is contained in:
Erik Demaine
2018-07-17 22:49:50 -04:00
committed by Kevin Barabash
parent 8f5239c272
commit 578877764d
3 changed files with 58 additions and 23 deletions
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17
test/katex-spec.js
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@@ -2999,6 +2999,23 @@ describe("\\tag support", function() {
});
});
describe("\\@binrel automatic bin/rel/ord", () => {
it("should generate proper class", () => {
expect("L\\@binrel+xR").toParseLike("L\\mathbin xR");
expect("L\\@binrel=xR").toParseLike("L\\mathrel xR");
expect("L\\@binrel xxR").toParseLike("L\\mathord xR");
expect("L\\@binrel{+}{x}R").toParseLike("L\\mathbin{{x}}R");
expect("L\\@binrel{=}{x}R").toParseLike("L\\mathrel{{x}}R");
expect("L\\@binrel{x}{x}R").toParseLike("L\\mathord{{x}}R");
});
it("should base on just first character in group", () => {
expect("L\\@binrel{+x}xR").toParseLike("L\\mathbin xR");
expect("L\\@binrel{=x}xR").toParseLike("L\\mathrel xR");
expect("L\\@binrel{xx}xR").toParseLike("L\\mathord xR");
});
});
describe("A parser taking String objects", function() {
it("should not fail on an empty String object", function() {
expect(new String("")).toParse();