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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/CommonHTML/autoload/mmultiscripts.js
- *
- * Implements the CommonHTML output for <mmultiscripts> elements.
- *
- * ---------------------------------------------------------------------
- *
- * Copyright (c) 2015-2017 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("CommonHTML Jax Ready",function () {
- var VERSION = "2.7.2";
- var MML = MathJax.ElementJax.mml,
- CHTML = MathJax.OutputJax.CommonHTML;
- MML.mmultiscripts.Augment({
- toCommonHTML: function (node,options) {
- var stretch = (options||{}).stretch;
- if (!stretch) {
- node = this.CHTMLcreateNode(node);
- this.CHTMLhandleStyle(node);
- this.CHTMLgetVariant();
- this.CHTMLhandleScale(node);
- }
- CHTML.BBOX.empty(this.CHTML);
- //
- // Get base node
- //
- var base, bbox;
- if (stretch) {
- base = CHTML.getNode(node,"mjx-base");
- } else {
- this.CHTMLaddChild(node,0,{type:"mjx-base", noBBox:true, forceChild:true});
- base = node.firstChild;
- }
- bbox = this.CHTMLbboxFor(0);
- if (bbox.ic) {
- bbox.R -= bbox.ic; // remove IC (added by mo and mi)
- if (!stretch) base.style.marginRight = CHTML.Em(-bbox.ic);
- delta = 1.3*bbox.ic + .05; // make faked IC be closer to expeted results
- }
-
- //
- // Collect scripts into horizontal boxes and add them into the node
- //
- var BOX = {}, BBOX = {};
- this.CHTMLgetScripts(BOX,BBOX,stretch,node);
- var sub = BOX.sub, sup = BOX.sup, presub = BOX.presub, presup = BOX.presup;
- var sbox = BBOX.sub, Sbox = BBOX.sup, pbox = BBOX.presub, Pbox = BBOX.presup;
- if (!stretch) this.CHTMLaddBoxes(node,base,BOX);
-
- //
- // Get the initial values for the variables
- //
- var values = this.getValues("scriptlevel","scriptsizemultiplier");
- var sscale = (this.Get("scriptlevel") < 3 ? values.scriptsizemultiplier : 1);
- var ex = CHTML.TEX.x_height, s = CHTML.TEX.scriptspace;
- var q = CHTML.TEX.sup_drop * sscale, r = CHTML.TEX.sub_drop * sscale;
- var u = bbox.h - q, v = bbox.d + r, delta = 0, p;
- var bmml = this.data[this.base];
- if (bmml && (bmml.type === "mi" || bmml.type === "mo")) {
- if (bmml.data.join("").length === 1 && bbox.rscale === 1 && !bbox.sH &&
- !bmml.Get("largeop")) {u = v = 0}
- }
- values = this.getValues("displaystyle","subscriptshift","superscriptshift","texprimestyle");
- values.subscriptshift = (values.subscriptshift === "" ? 0 : this.CHTMLlength2em(values.subscriptshift));
- values.superscriptshift = (values.superscriptshift === "" ? 0 : this.CHTMLlength2em(values.superscriptshift));
- var dx = (presub ? s+pbox.w : presup ? s+Pbox.w-delta : 0);
- this.CHTML.combine(bbox,dx,0); var x = this.CHTML.w;
- //
- // Place the scripts as needed
- //
- if (!sup && !presup) {
- v = Math.max(v,CHTML.TEX.sub1,values.subscriptshift);
- if (sub) v = Math.max(v,sbox.h-(4/5)*ex);
- if (presub) v = Math.max(v,pbox.h-(4/5)*ex);
- if (sub) this.CHTMLplaceSubOnly(sub,sbox,x,v,s);
- if (presub) this.CHTMLplacePresubOnly(presub,pbox,v,s);
- } else {
- if (!sub && !presub) {
- p = CHTML.TEX[(values.displaystyle ? "sup1" : (values.texprimestyle ? "sup3" : "sup2"))];
- u = Math.max(u,p,values.superscriptshift);
- if (sup) u = Math.max(u,Sbox.d+(1/4)*ex);
- if (presup) u = Math.max(u,Pbox.d+(1/4)*ex);
- if (sup) this.CHTMLplaceSupOnly(sup,Sbox,x,delta,u,s);
- if (presup) this.CHTMLplacePresupOnly(presup,Pbox,delta,u,s);
- } else {
- v = Math.max(v,CHTML.TEX.sub2);
- var t = CHTML.TEX.rule_thickness;
- var h = (sbox||pbox).h, d = (Sbox||Pbox).d;
- if (presub) h = Math.max(h,pbox.h);
- if (presup) d = Math.max(d,Pbox.d);
- if ((u - d) - (h - v) < 3*t) {
- v = 3*t - u + d + h; q = (4/5)*ex - (u - d);
- if (q > 0) {u += q; v -= q}
- }
- u = Math.max(u,values.superscriptshift);
- v = Math.max(v,values.subscriptshift);
- if (sup) {
- if (sub) {this.CHTMLplaceSubSup(sub,sbox,sup,Sbox,x,delta,u,v,s)}
- else {this.CHTMLplaceSupOnly(sup,Sbox,x,delta,u,s)}
- } else if (sub) {this.CHTMLplaceSubOnly(sub,sbox,x,v,s)}
- if (presup) {
- if (presub) {this.CHTMLplacePresubPresup(presub,pbox,presup,Pbox,delta,u,v,s)}
- else {this.CHTMLplacePresupOnly(presup,Pbox,delta,u,s)}
- } else if (presub) {this.CHTMLplacePresubOnly(presub,pbox,v,s)}
- }
- }
- this.CHTML.clean();
- this.CHTMLhandleSpace(node);
- this.CHTMLhandleBBox(node);
- this.CHTMLhandleColor(node);
- return node;
- },
- //
- // Get the subscript, superscript, presubscript, and presuperscript
- // boxes, with proper spacing, and computer their bounding boxes.
- //
- CHTMLgetScripts: function (BOX,BBOX,stretch,node) {
- if (stretch) {
- BOX.sub = CHTML.getNode(node,"mjx-sub");
- BOX.sup = CHTML.getNode(node,"mjx-sup");
- BOX.presub = CHTML.getNode(node,"mjx-presub");
- BOX.presup = CHTML.getNode(node,"mjx-presup");
- BBOX.sub = this.CHTMLbbox.sub;
- BBOX.sup = this.CHTMLbbox.sup;
- BBOX.presub = this.CHTMLbbox.presub;
- BBOX.presup = this.CHTMLbbox.presup;
- return;
- }
- this.CHTMLbbox = BBOX; // save for when stretched
- var state = {i:1, w:0, BOX:BOX, BBOX:BBOX}, m = this.data.length;
- var sub = "sub", sup = "sup";
- while (state.i < m) {
- if ((this.data[state.i]||{}).type === "mprescripts") {
- state.i++; state.w = 0;
- sub = "presub"; sup = "presup";
- } else {
- var sbox = this.CHTMLaddScript(sub,state,node);
- var Sbox = this.CHTMLaddScript(sup,state,node);
- var w = Math.max((sbox ? sbox.rscale*sbox.w : 0),(Sbox ? Sbox.rscale*Sbox.w : 0));
- this.CHTMLpadScript(sub,w,sbox,state);
- this.CHTMLpadScript(sup,w,Sbox,state);
- state.w += w;
- }
- }
- if (BBOX.sub) BBOX.sub.clean();
- if (BBOX.sup) BBOX.sup.clean();
- if (BBOX.presub) BBOX.presub.clean();
- if (BBOX.presup) BBOX.presup.clean();
- },
- //
- // Add a script to the proper box, creating the box if needed,
- // and padding the box to account for any <none/> elements.
- // Return the bounding box for the script for later use.
- //
- CHTMLaddScript: function (type,state,node) {
- var BOX, BBOX, data = this.data[state.i];
- if (data && data.type !== "none" && data.type !== "mprescripts") {
- BOX = state.BOX[type];
- if (!BOX) {
- //
- // Add the box to the node temporarily so that it is in the DOM
- // (so that CHTMLnodeElement() can be used in the toCommonHTML() below).
- // See issue #1480.
- //
- BOX = state.BOX[type] = CHTML.addElement(node,"mjx-"+type);
- BBOX = state.BBOX[type] = CHTML.BBOX.empty();
- if (state.w) {
- BOX.style.paddingLeft = CHTML.Em(state.w);
- BBOX.w = BBOX.r = state.w; BBOX.x = state.w;
- }
- }
- data.toCommonHTML(BOX);
- BBOX = data.CHTML;
- }
- if (data && data.type !== "mprescripts") state.i++;
- return BBOX;
- },
- //
- // Add padding to the script box to make match the width of the
- // super- or subscript that is above or below it, and adjust the
- // bounding box for the script row. If these are pre-scripts,
- // right-justify the scripts, otherwise, left-justify them.
- //
- CHTMLpadScript: function (type,w,bbox,state) {
- if (!bbox) bbox = {w:0, fake:1, rscale:1};
- var BBOX = state.BBOX[type], dx = 0, dw = 0;
- if (BBOX) {
- if (bbox.rscale*bbox.w < w) {
- var BOX = state.BOX[type]; dw = w-bbox.rscale*bbox.w;
- var space = CHTML.Element("mjx-spacer",{style:{width:CHTML.Em(dw)}});
- if (type.substr(0,3) === "pre" && !bbox.fake) {
- BOX.insertBefore(space,BOX.lastChild);
- dx = dw; dw = 0;
- } else {
- BOX.appendChild(space);
- }
- }
- if (bbox.fake) {BBOX.w += dx} else {BBOX.combine(bbox,BBOX.w+dx,0)}
- BBOX.w += dw;
- }
- },
- //
- // Add the boxes into the main node, creating stacks when needed
- //
- CHTMLaddBoxes: function (node,base,BOX) {
- var sub = BOX.sub, sup = BOX.sup, presub = BOX.presub, presup = BOX.presup;
- if (presub && presup) {
- var prestack = CHTML.Element("mjx-prestack"); node.insertBefore(prestack,base);
- prestack.appendChild(presup); prestack.appendChild(presub);
- } else {
- if (presub) node.insertBefore(presub,base);
- if (presup) node.insertBefore(presup,base);
- }
- if (sub && sup) {
- var stack = CHTML.addElement(node,"mjx-stack");
- stack.appendChild(sup); stack.appendChild(sub);
- } else {
- if (sub) node.appendChild(sub);
- if (sup) node.appendChild(sup);
- }
- },
- //
- // Handle positioning the various scripts
- //
- CHTMLplaceSubOnly: function (sub,sbox,x,v,s) {
- sub.style.verticalAlign = CHTML.Em(-v);
- sub.style.marginRight = CHTML.Em(s); sbox.w += s;
- this.CHTML.combine(sbox,x,-v);
- },
- CHTMLplaceSupOnly: function (sup,Sbox,x,delta,u,s) {
- sup.style.verticalAlign = CHTML.Em(u);
- sup.style.paddingLeft = CHTML.Em(delta);
- sup.style.paddingRight = CHTML.Em(s); Sbox.w += s;
- this.CHTML.combine(Sbox,x+delta,u);
- },
- CHTMLplaceSubSup: function (sub,sbox,sup,Sbox,x,delta,u,v,s) {
- sub.style.paddingRight = CHTML.Em(s); sbox.w += s;
- sup.style.paddingBottom = CHTML.Em(u+v-Sbox.d-sbox.h);
- sup.style.paddingLeft = CHTML.Em(delta+(Sbox.x||0));
- sup.style.paddingRight = CHTML.Em(s); Sbox.w += s;
- sup.parentNode.style.verticalAlign = CHTML.Em(-v);
- this.CHTML.combine(sbox,x,-v);
- this.CHTML.combine(Sbox,x+delta,u);
- },
- CHTMLplacePresubOnly: function (presub,pbox,v,s) {
- presub.style.verticalAlign = CHTML.Em(-v);
- presub.style.marginLeft = CHTML.Em(s);
- this.CHTML.combine(pbox,s,-v);
- },
- CHTMLplacePresupOnly: function (presup,Pbox,delta,u,s) {
- presup.style.verticalAlign = CHTML.Em(u);
- presup.style.paddingLeft = CHTML.Em(s);
- presup.style.paddingRight = CHTML.Em(-delta);
- this.CHTML.combine(Pbox,s,u);
- },
- CHTMLplacePresubPresup: function (presub,pbox,presup,Pbox,delta,u,v,s) {
- presub.style.paddingLeft = CHTML.Em(s);
- presup.style.paddingBottom = CHTML.Em(u+v-Pbox.d-pbox.h);
- presup.style.paddingLeft = CHTML.Em(delta+s+(Pbox.x||0));
- presup.style.paddingRight = CHTML.Em(-delta);
- presup.parentNode.style.verticalAlign = CHTML.Em(-v);
- this.CHTML.combine(pbox,s,-v);
- this.CHTML.combine(Pbox,s+delta,u);
- },
- //
- // Handle stretchy bases
- //
- CHTMLstretchH: MML.mbase.CHTMLstretchH,
- CHTMLstretchV: MML.mbase.CHTMLstretchV
- });
-
- MathJax.Hub.Startup.signal.Post("CommonHTML mmultiscripts Ready");
- MathJax.Ajax.loadComplete(CHTML.autoloadDir+"/mmultiscripts.js");
- });
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