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- /* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
- /* vim: set ts=2 et sw=2 tw=80: */
- /*************************************************************
- *
- * MathJax/jax/output/HTML-CSS/autoload/mmultiscripts.js
- *
- * Implements the HTML-CSS output for <mmultiscripts> elements.
- *
- * ---------------------------------------------------------------------
- *
- * Copyright (c) 2010-2017 The MathJax Consortium
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- MathJax.Hub.Register.StartupHook("HTML-CSS Jax Ready",function () {
- var VERSION = "2.7.2";
- var MML = MathJax.ElementJax.mml,
- HTMLCSS = MathJax.OutputJax["HTML-CSS"];
-
- MML.mmultiscripts.Augment({
- toHTML: function (span,HW,D) {
- span = this.HTMLcreateSpan(span); var scale = this.HTMLgetScale();
- var stack = HTMLCSS.createStack(span), values;
- var base = HTMLCSS.createBox(stack);
- if (this.data[this.base]) {
- var child = this.data[this.base].toHTML(base);
- if (D != null) {this.data[this.base].HTMLstretchV(base,HW,D)}
- else if (HW != null) {this.data[this.base].HTMLstretchH(base,HW)}
- HTMLCSS.Measured(child,base);
- } else {base.bbox = this.HTMLzeroBBox()}
- var x_height = HTMLCSS.TeX.x_height * scale,
- s = HTMLCSS.TeX.scriptspace * scale * .75; // FIXME: .75 can be removed when IC is right?
- var BOX = this.HTMLgetScripts(stack,s);
- var sub = BOX[0], sup = BOX[1], presub = BOX[2], presup = BOX[3];
- //
- // <mmultiscripts> children other than the base can be <none/>,
- // <mprescripts/>, <mrow></mrow> etc so try to get HTMLgetScale from the
- // first element with a spanID. See issue 362.
- //
- var sscale = scale;
- for (var i = 1; i < this.data.length; i++) {
- if (this.data[i] && this.data[i].spanID) {
- sscale = this.data[i].HTMLgetScale();
- break;
- }
- }
- var q = HTMLCSS.TeX.sup_drop * sscale, r = HTMLCSS.TeX.sub_drop * sscale;
- var u = base.bbox.h - q, v = base.bbox.d + r, delta = 0, p;
- if (base.bbox.ic) {delta = base.bbox.ic}
- if (this.data[this.base] &&
- (this.data[this.base].type === "mi" || this.data[this.base].type === "mo")) {
- if (this.data[this.base].data.join("").length === 1 && base.bbox.scale === 1 &&
- !this.data[this.base].Get("largeop")) {u = v = 0}
- }
- var min = this.getValues("subscriptshift","superscriptshift"), mu = this.HTMLgetMu(span);
- min.subscriptshift = (min.subscriptshift === "" ? 0 : HTMLCSS.length2em(min.subscriptshift,mu));
- min.superscriptshift = (min.superscriptshift === "" ? 0 : HTMLCSS.length2em(min.superscriptshift,mu));
- var dx = 0;
- if (presub) {dx = presub.bbox.w+delta} else if (presup) {dx = presup.bbox.w-delta}
- if (dx < 0) {dx = 0};
- HTMLCSS.placeBox(base,dx,0);
- if (!sup && !presup) {
- v = Math.max(v,HTMLCSS.TeX.sub1*scale,min.subscriptshift);
- if (sub) {v = Math.max(v,sub.bbox.h-(4/5)*x_height)}
- if (presub) {v = Math.max(v,presub.bbox.h-(4/5)*x_height)}
- if (sub) {HTMLCSS.placeBox(sub,dx+base.bbox.w+s-delta,-v)}
- if (presub) {HTMLCSS.placeBox(presub,0,-v)}
- } else {
- if (!sub && !presub) {
- values = this.getValues("displaystyle","texprimestyle");
- p = HTMLCSS.TeX[(values.displaystyle ? "sup1" : (values.texprimestyle ? "sup3" : "sup2"))];
- u = Math.max(u,p*scale,min.superscriptshift);
- if (sup) {u = Math.max(u,sup.bbox.d+(1/4)*x_height)}
- if (presup) {u = Math.max(u,presup.bbox.d+(1/4)*x_height)}
- if (sup) {HTMLCSS.placeBox(sup,dx+base.bbox.w+s,u)}
- if (presup) {HTMLCSS.placeBox(presup,0,u)}
- } else {
- v = Math.max(v,HTMLCSS.TeX.sub2*scale);
- var t = HTMLCSS.TeX.rule_thickness * scale;
- var h = (sub||presub).bbox.h, d = (sup||presup).bbox.d;
- if (presub) {h = Math.max(h,presub.bbox.h)}
- if (presup) {d = Math.max(d,presup.bbox.d)}
- if ((u - d) - (h - v) < 3*t) {
- v = 3*t - u + d + h; q = (4/5)*x_height - (u - d);
- if (q > 0) {u += q; v -= q}
- }
- u = Math.max(u,min.superscriptshift); v = Math.max(v,min.subscriptshift);
- if (sup) {HTMLCSS.placeBox(sup,dx+base.bbox.w+s,u)}
- if (presup) {HTMLCSS.placeBox(presup,dx+delta-presup.bbox.w,u)}
- if (sub) {HTMLCSS.placeBox(sub,dx+base.bbox.w+s-delta,-v)}
- if (presub) {HTMLCSS.placeBox(presub,dx-presub.bbox.w,-v)}
- }
- }
- this.HTMLhandleSpace(span);
- this.HTMLhandleColor(span);
- var bbox = span.bbox;
- bbox.dx = dx; bbox.s = s; bbox.u = u; bbox.v = v; bbox.delta = delta;
- bbox.px = dx+base.bbox.w;
- return span;
- },
- HTMLgetScripts: function (stack,s) {
- var sup, sub, BOX = [];
- var i = 1, m = this.data.length, W = 0;
- for (var k = 0; k < 4; k += 2) {
- while (i < m && (this.data[i]||{}).type !== "mprescripts") {
- var box = [null,null,null,null];
- for (var j = k; j < k+2; j++) {
- if (this.data[i] && this.data[i].type !== "none" && this.data[i].type !== "mprescripts") {
- if (!BOX[j]) {
- BOX[j] = HTMLCSS.createBox(stack); BOX[j].bbox = this.HTMLemptyBBox({});
- if (W) {HTMLCSS.createBlank(BOX[j],W); BOX[j].bbox.w = BOX[j].bbox.rw = W}
- }
- box[j] = this.data[i].toHTML(BOX[j]);
- } else {
- box[j] = MathJax.HTML.Element("span",{bbox:this.HTMLemptyBBox({})});
- }
- if ((this.data[i]||{}).type !== "mprescripts") i++;
- }
- var isPre = (k === 2);
- sub = BOX[k]; sup = BOX[k+1];
- if (sub && sup) {
- var w = box[k+1].bbox.w - box[k].bbox.w;
- if (w > 0) {
- if (isPre) {
- this.HTMLmoveColor(box[k],w,1);
- BOX[k].w += w;
- } else {
- HTMLCSS.createBlank(sub,w);
- }
- } else if (w < 0) {
- if (isPre) {
- this.HTMLmoveColor(box[k+1],-w,-1);
- BOX[k+1].w += -w;
- } else {
- HTMLCSS.createBlank(sup,-w);
- }
- }
- this.HTMLcombineBBoxes(box[k],sub.bbox);
- this.HTMLcombineBBoxes(box[k+1],sup.bbox);
- if (w > 0) {
- sub.bbox.w = sup.bbox.w;
- sub.bbox.rw = Math.max(sub.bbox.w,sub.bbox.rw);
- } else if (w < 0) {
- sup.bbox.w = sub.bbox.w;
- sup.bbox.rw = Math.max(sup.bbox.w,sup.bbox.rw);
- }
- } else {
- if (sub) this.HTMLcombineBBoxes(box[k],sub.bbox);
- if (sup) this.HTMLcombineBBoxes(box[k+1],sup.bbox);
- }
- if (sub) {W = sub.bbox.w} else if (sup) {W = sup.bbox.w}
- }
- i++; W = 0;
- }
- for (j = 0; j < 4; j++) {
- if (BOX[j]) {
- BOX[j].bbox.w += s;
- BOX[j].bbox.rw = Math.max(BOX[j].bbox.w,BOX[j].bbox.rw);
- BOX[j].bbox.name = (["sub","sup","presub","presup"])[j];
- this.HTMLcleanBBox(BOX[j].bbox);
- }
- }
- return BOX;
- },
- HTMLmoveColor: function (box,w,sign) {
- var W = w/(box.scale||1);
- box.style.paddingLeft = HTMLCSS.Em(W);
- var color = box.previousSibling;
- if (color && (color.id||"").match(/^MathJax-Color-/)) {
- color.style.marginLeft = HTMLCSS.Em(W+parseFloat(color.style.marginLeft));
- color.style.marginRight = HTMLCSS.Em(sign*(W-parseFloat(color.style.marginRight)));
- }
-
- },
- HTMLstretchH: MML.mbase.HTMLstretchH,
- HTMLstretchV: MML.mbase.HTMLstretchV
- });
-
- MathJax.Hub.Startup.signal.Post("HTML-CSS mmultiscripts Ready");
- MathJax.Ajax.loadComplete(HTMLCSS.autoloadDir+"/mmultiscripts.js");
- });
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