mmultiscripts.js (8072B)
1 /* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */ 2 /* vim: set ts=2 et sw=2 tw=80: */ 3 4 /************************************************************* 5 * 6 * MathJax/jax/output/HTML-CSS/autoload/mmultiscripts.js 7 * 8 * Implements the HTML-CSS output for <mmultiscripts> elements. 9 * 10 * --------------------------------------------------------------------- 11 * 12 * Copyright (c) 2010-2015 The MathJax Consortium 13 * 14 * Licensed under the Apache License, Version 2.0 (the "License"); 15 * you may not use this file except in compliance with the License. 16 * You may obtain a copy of the License at 17 * 18 * http://www.apache.org/licenses/LICENSE-2.0 19 * 20 * Unless required by applicable law or agreed to in writing, software 21 * distributed under the License is distributed on an "AS IS" BASIS, 22 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 23 * See the License for the specific language governing permissions and 24 * limitations under the License. 25 */ 26 27 MathJax.Hub.Register.StartupHook("HTML-CSS Jax Ready",function () { 28 var VERSION = "2.6.0"; 29 var MML = MathJax.ElementJax.mml, 30 HTMLCSS = MathJax.OutputJax["HTML-CSS"]; 31 32 MML.mmultiscripts.Augment({ 33 toHTML: function (span,HW,D) { 34 span = this.HTMLcreateSpan(span); var scale = this.HTMLgetScale(); 35 var stack = HTMLCSS.createStack(span), values; 36 var base = HTMLCSS.createBox(stack); 37 if (this.data[this.base]) { 38 var child = this.data[this.base].toHTML(base); 39 if (D != null) {this.data[this.base].HTMLstretchV(base,HW,D)} 40 else if (HW != null) {this.data[this.base].HTMLstretchH(base,HW)} 41 HTMLCSS.Measured(child,base); 42 } else {base.bbox = this.HTMLzeroBBox()} 43 var x_height = HTMLCSS.TeX.x_height * scale, 44 s = HTMLCSS.TeX.scriptspace * scale * .75; // FIXME: .75 can be removed when IC is right? 45 46 var BOX = this.HTMLgetScripts(stack,s); 47 var sub = BOX[0], sup = BOX[1], presub = BOX[2], presup = BOX[3]; 48 49 // 50 // <mmultiscripts> children other than the base can be <none/>, 51 // <mprescripts/>, <mrow></mrow> etc so try to get HTMLgetScale from the 52 // first element with a spanID. See issue 362. 53 // 54 var sscale = scale; 55 for (var i = 1; i < this.data.length; i++) { 56 if (this.data[i] && this.data[i].spanID) { 57 sscale = this.data[i].HTMLgetScale(); 58 break; 59 } 60 } 61 62 var q = HTMLCSS.TeX.sup_drop * sscale, r = HTMLCSS.TeX.sub_drop * sscale; 63 var u = base.bbox.h - q, v = base.bbox.d + r, delta = 0, p; 64 if (base.bbox.ic) {delta = base.bbox.ic} 65 if (this.data[this.base] && 66 (this.data[this.base].type === "mi" || this.data[this.base].type === "mo")) { 67 if (this.data[this.base].data.join("").length === 1 && base.bbox.scale === 1 && 68 !this.data[this.base].Get("largeop")) {u = v = 0} 69 } 70 var min = this.getValues("subscriptshift","superscriptshift"), mu = this.HTMLgetMu(span); 71 min.subscriptshift = (min.subscriptshift === "" ? 0 : HTMLCSS.length2em(min.subscriptshift,mu)); 72 min.superscriptshift = (min.superscriptshift === "" ? 0 : HTMLCSS.length2em(min.superscriptshift,mu)); 73 74 var dx = 0; 75 if (presub) {dx = presub.bbox.w+delta} else if (presup) {dx = presup.bbox.w-delta} 76 if (dx < 0) {dx = 0}; 77 HTMLCSS.placeBox(base,dx,0); 78 79 if (!sup && !presup) { 80 v = Math.max(v,HTMLCSS.TeX.sub1*scale,min.subscriptshift); 81 if (sub) {v = Math.max(v,sub.bbox.h-(4/5)*x_height)} 82 if (presub) {v = Math.max(v,presub.bbox.h-(4/5)*x_height)} 83 if (sub) {HTMLCSS.placeBox(sub,dx+base.bbox.w+s-delta,-v)} 84 if (presub) {HTMLCSS.placeBox(presub,0,-v)} 85 } else { 86 if (!sub && !presub) { 87 values = this.getValues("displaystyle","texprimestyle"); 88 p = HTMLCSS.TeX[(values.displaystyle ? "sup1" : (values.texprimestyle ? "sup3" : "sup2"))]; 89 u = Math.max(u,p*scale,min.superscriptshift); 90 if (sup) {u = Math.max(u,sup.bbox.d+(1/4)*x_height)} 91 if (presup) {u = Math.max(u,presup.bbox.d+(1/4)*x_height)} 92 if (sup) {HTMLCSS.placeBox(sup,dx+base.bbox.w+s,u)} 93 if (presup) {HTMLCSS.placeBox(presup,0,u)} 94 } else { 95 v = Math.max(v,HTMLCSS.TeX.sub2*scale); 96 var t = HTMLCSS.TeX.rule_thickness * scale; 97 var h = (sub||presub).bbox.h, d = (sup||presup).bbox.d; 98 if (presub) {h = Math.max(h,presub.bbox.h)} 99 if (presup) {d = Math.max(d,presup.bbox.d)} 100 if ((u - d) - (h - v) < 3*t) { 101 v = 3*t - u + d + h; q = (4/5)*x_height - (u - d); 102 if (q > 0) {u += q; v -= q} 103 } 104 u = Math.max(u,min.superscriptshift); v = Math.max(v,min.subscriptshift); 105 if (sup) {HTMLCSS.placeBox(sup,dx+base.bbox.w+s,u)} 106 if (presup) {HTMLCSS.placeBox(presup,dx+delta-presup.bbox.w,u)} 107 if (sub) {HTMLCSS.placeBox(sub,dx+base.bbox.w+s-delta,-v)} 108 if (presub) {HTMLCSS.placeBox(presub,dx-presub.bbox.w,-v)} 109 } 110 } 111 this.HTMLhandleSpace(span); 112 this.HTMLhandleColor(span); 113 var bbox = span.bbox; 114 bbox.dx = dx; bbox.s = s; bbox.u = u; bbox.v = v; bbox.delta = delta; 115 bbox.px = dx+base.bbox.w; 116 return span; 117 }, 118 HTMLgetScripts: function (stack,s) { 119 var sup, sub, BOX = []; 120 var i = 1, m = this.data.length, W = 0; 121 for (var k = 0; k < 4; k += 2) { 122 while (i < m && (this.data[i]||{}).type !== "mprescripts") { 123 var box = [null,null,null,null]; 124 for (var j = k; j < k+2; j++) { 125 if (this.data[i] && this.data[i].type !== "none" && this.data[i].type !== "mprescripts") { 126 if (!BOX[j]) { 127 BOX[j] = HTMLCSS.createBox(stack); BOX[j].bbox = this.HTMLemptyBBox({}); 128 if (W) {HTMLCSS.createBlank(BOX[j],W); BOX[j].bbox.w = BOX[j].bbox.rw = W} 129 } 130 box[j] = this.data[i].toHTML(BOX[j]); 131 } else { 132 box[j] = MathJax.HTML.Element("span",{bbox:this.HTMLemptyBBox({})}); 133 } 134 if ((this.data[i]||{}).type !== "mprescripts") i++; 135 } 136 var isPre = (k === 2); 137 sub = BOX[k]; sup = BOX[k+1]; 138 if (sub && sup) { 139 var w = box[k+1].bbox.w - box[k].bbox.w; 140 if (w > 0) { 141 if (isPre) { 142 box[k].style.paddingLeft = HTMLCSS.Em(w/(box[k].scale||1)); 143 BOX[k].w += w; 144 } else { 145 HTMLCSS.createBlank(sub,w); 146 } 147 } else if (w < 0) { 148 if (isPre) { 149 box[k+1].style.paddingLeft = HTMLCSS.Em(-w/(box[k+1].scale||1)); 150 BOX[k+1].w += -w; 151 } else { 152 HTMLCSS.createBlank(sup,-w); 153 } 154 } 155 this.HTMLcombineBBoxes(box[k],sub.bbox); 156 this.HTMLcombineBBoxes(box[k+1],sup.bbox); 157 if (w > 0) { 158 sub.bbox.w = sup.bbox.w; 159 sub.bbox.rw = Math.max(sub.bbox.w,sub.bbox.rw); 160 } else if (w < 0) { 161 sup.bbox.w = sub.bbox.w; 162 sup.bbox.rw = Math.max(sup.bbox.w,sup.bbox.rw); 163 } 164 } else { 165 if (sub) this.HTMLcombineBBoxes(box[k],sub.bbox); 166 if (sup) this.HTMLcombineBBoxes(box[k+1],sup.bbox); 167 } 168 if (sub) {W = sub.bbox.w} else if (sup) {W = sup.bbox.w} 169 } 170 i++; W = 0; 171 } 172 for (j = 0; j < 4; j++) { 173 if (BOX[j]) { 174 BOX[j].bbox.w += s; 175 BOX[j].bbox.rw = Math.max(BOX[j].bbox.w,BOX[j].bbox.rw); 176 BOX[j].bbox.name = (["sub","sup","presub","presup"])[j]; 177 this.HTMLcleanBBox(BOX[j].bbox); 178 } 179 } 180 return BOX; 181 }, 182 HTMLstretchH: MML.mbase.HTMLstretchH, 183 HTMLstretchV: MML.mbase.HTMLstretchV 184 }); 185 186 MathJax.Hub.Startup.signal.Post("HTML-CSS mmultiscripts Ready"); 187 MathJax.Ajax.loadComplete(HTMLCSS.autoloadDir+"/mmultiscripts.js"); 188 189 }); 190