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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | 2x 2x 2x 2x 2x 4148x 2928x 1220x 2x 122x | // @preval
require("@babel/register");
// Fast way to compare RGL props in shouldComponentUpdate.
// Generates the fastest possible comparison of the type:
// function (a, b) { return a.className === b.className && a.style === b.style && ... }
// This avoids enumerating keys, avoids us keeping our own key list, and can be very easily optimized.
const PropTypes = require("prop-types");
const propTypes = require("./ReactGridLayoutPropTypes").default;
const keys = Object.keys(propTypes);
// Remove 'children' key as we don't want to compare it
keys.splice(keys.indexOf("children"), 1);
// Returns a code string indicating what to do here.
// In most cases we want to do a simple equality comparison,
// but we have some arrays and tuples and objects we want
// to do a shallow comparison on.
function getEqualType(key) {
if (
[
PropTypes.number,
PropTypes.bool,
PropTypes.string,
PropTypes.func
].includes(propTypes[key])
) {
return `(a.${key} === b.${key})`;
}
return `isEqualImpl(a.${key}, b.${key})`;
}
// Exports a function that compares a and b. `isEqualImpl` is a required
// third prop, as we can't otherwise access it.
module.exports = () =>
eval(`
function fastRGLPropsEqual(a, b, isEqualImpl) {
if (a === b) return true;
return (
${keys.map(getEqualType).join(" && ")}
);
}
fastRGLPropsEqual;
`);
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