// @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7&dn=apache-2.0.txt Apache-2.0
/* -*- 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) 2015-2020 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 = "2.7.9";
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 (CHTML.isChar(bmml.data.join("")) && 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");
});
// @license-end
