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Use superscript for scriptChild in msubsup. (mathjax/MathJax#3097) #999

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Sep 15, 2023
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Use superscript for scriptChild in msubsup. (mathjax/MathJax#3097) #999

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20 changes: 15 additions & 5 deletions ts/output/common/Wrappers/msubsup.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -412,6 +412,13 @@ export function CommonMsubsupMixin<
return this.childNodes[(this.node as MmlMsubsup).sup];
}

/**
* @override
*/
public get scriptChild(): WW {
return this.supChild;
}

/**
* @override
*/
Expand All @@ -426,23 +433,26 @@ export function CommonMsubsupMixin<
const t = 3 * tex.rule_thickness;
const subscriptshift = this.length2em(this.node.attributes.get('subscriptshift'), tex.sub2);
const drop = this.baseCharZero(bbox.d * this.baseScale + tex.sub_drop * subbox.rscale);
const supd = supbox.d * supbox.rscale;
const subh = subbox.h * subbox.rscale;
//
// u and v are the veritcal shifts of the scripts, initially set to minimum values and then adjusted
//
let [u, v] = [this.getU(), Math.max(drop, subscriptshift)];
//
// q is the space currently between the super- and subscripts.
// If it is less than 3 rule thicknesses,
// increase the subscript offset to make the space 3 rule thicknesses
// Increase the subscript offset to make the space 3 rule thicknesses
// If the bottom of the superscript is below 4/5 of the x-height
// raise both the super- and subscripts by the difference
// (make the bottom of the superscript be at 4/5 the x-height, and the
// subscript 3 rule thickness below that).
// subscript 3 rule thickness below that),
// provided we don't move up past the original subscript position.
//
let q = (u - supbox.d * supbox.rscale) - (subbox.h * subbox.rscale - v);
let q = (u - supd) - (subh - v);
if (q < t) {
v += t - q;
const p = (4 / 5) * tex.x_height - (u - supbox.d * supbox.rscale);
const p = (4 / 5) * tex.x_height - (u - supd);
if (p > 0) {
u += p;
v -= p;
Expand All @@ -454,7 +464,7 @@ export function CommonMsubsupMixin<
//
u = Math.max(this.length2em(this.node.attributes.get('superscriptshift'), u), u);
v = Math.max(this.length2em(this.node.attributes.get('subscriptshift'), v), v);
q = (u - supbox.d * supbox.rscale) - (subbox.h * subbox.rscale - v);
q = (u - supd) - (subh - v);
this.UVQ = [u, -v, q];
return this.UVQ;
}
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