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Add optional pre-process callback to the auto-renderer. (#1784)

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* Add optional pre-process callback to the auto-renderer.

* Rewrite `preProcess` callback signature.

* Add test.

* Make test future-proof.

* Add root folder to the node module paths.
This commit is contained in:
AlbertHilb
2018-12-24 00:29:59 +01:00
committed by Kevin Barabash
parent ce3840d4ce
commit f10de9617e
4 changed files with 25 additions and 2 deletions
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5
contrib/auto-render/auto-render.js
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@@ -26,11 +26,14 @@ const renderMathInText = function(text, optionsCopy) {
fragment.appendChild(document.createTextNode(data[i].data));
} else {
const span = document.createElement("span");
const math = data[i].data;
let math = data[i].data;
// Override any display mode defined in the settings with that
// defined by the text itself
optionsCopy.displayMode = data[i].display;
try {
if (optionsCopy.preProcess) {
math = optionsCopy.preProcess(math);
}
katex.render(math, span, optionsCopy);
} catch (e) {
if (!(e instanceof katex.ParseError)) {

17
contrib/auto-render/test/auto-render-spec.js
View File

@@ -4,6 +4,7 @@
/* global describe: false */
import splitAtDelimiters from "../splitAtDelimiters";
import renderMathInElement from "../auto-render";
beforeEach(function() {
expect.extend({
@@ -234,3 +235,19 @@ describe("A delimiter splitter", function() {
]);
});
});
describe("Pre-process callback", function() {
it("replace `-squared` with `^2 `", function() {
const el1 = document.createElement('div');
el1.textContent = 'Circle equation: $x-squared + y-squared = r-squared$.';
const el2 = document.createElement('div');
el2.textContent = 'Circle equation: $x^2 + y^2 = r^2$.';
const delimiters = [{left: "$", right: "$", display: false}];
renderMathInElement(el1, {
delimiters,
preProcess: math => math.replace(/-squared/g, '^2'),
});
renderMathInElement(el2, {delimiters});
expect(el1.innerHTML).toEqual(el2.innerHTML);
});
});