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| Current File : //usr/share/javascript/mathjax/unpacked/jax/output/CommonHTML/autoload/multiline.js |
/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/*************************************************************
*
* MathJax/jax/output/CommonHTML/autoload/multiline.js
*
* Implements the CommonHTML output for <mrow>'s that contain line breaks.
*
* ---------------------------------------------------------------------
*
* Copyright (c) 2015-2018 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 = "2.7.4";
var MML = MathJax.ElementJax.mml,
CONFIG = MathJax.Hub.config,
CHTML = MathJax.OutputJax.CommonHTML;
//
// Penalties for the various line breaks
//
var PENALTY = {
newline: 0,
nobreak: 1000000,
goodbreak: [-200],
badbreak: [+200],
auto: [0],
maxwidth: 1.33, // stop looking for breaks after this time the line-break width
toobig: 800,
nestfactor: 400,
spacefactor: -100,
spaceoffset: 2,
spacelimit: 1, // spaces larger than this get a penalty boost
fence: 500,
close: 500
};
var ENDVALUES = {linebreakstyle: "after"};
/**************************************************************************/
MML.mbase.Augment({
CHTMLlinebreakPenalty: PENALTY,
/****************************************************************/
//
// Handle breaking an mrow into separate lines
//
CHTMLmultiline: function (node) {
//
// Find the parent element and mark it as multiline
//
var parent = this;
while (parent.inferred || (parent.parent && parent.parent.type === "mrow" &&
parent.parent.isEmbellished())) {parent = parent.parent}
var isTop = ((parent.type === "math" && parent.Get("display") === "block") ||
parent.type === "mtd");
parent.isMultiline = true;
//
// Default values for the line-breaking parameters
//
var VALUES = this.getValues(
"linebreak","linebreakstyle","lineleading","linebreakmultchar",
"indentalign","indentshift",
"indentalignfirst","indentshiftfirst",
"indentalignlast","indentshiftlast"
);
if (VALUES.linebreakstyle === MML.LINEBREAKSTYLE.INFIXLINEBREAKSTYLE)
VALUES.linebreakstyle = this.Get("infixlinebreakstyle");
VALUES.lineleading = this.CHTMLlength2em(VALUES.lineleading,0.5);
//
// Break the math at its best line breaks
//
CHTML.BBOX.empty(this.CHTML);
var stack = CHTML.addElement(node,"mjx-stack");
var state = {
BBOX: this.CHTML,
n: 0, Y: 0,
scale: (this.CHTML.scale||1),
isTop: isTop,
values: {},
VALUES: VALUES
},
align = this.CHTMLgetAlign(state,{}),
shift = this.CHTMLgetShift(state,{},align),
start = [],
end = {
index:[], penalty:PENALTY.nobreak,
w:0, W:shift, shift:shift, scanW:shift,
nest: 0
},
broken = false;
while (this.CHTMLbetterBreak(end,state) &&
(end.scanW >= CHTML.linebreakWidth || end.penalty === PENALTY.newline)) {
this.CHTMLaddLine(stack,start,end.index,state,end.values,broken);
start = end.index.slice(0); broken = true;
align = this.CHTMLgetAlign(state,end.values);
shift = this.CHTMLgetShift(state,end.values,align);
end.W = end.shift = end.scanW = shift; end.penalty = PENALTY.nobreak;
}
state.isLast = true;
this.CHTMLaddLine(stack,start,[],state,ENDVALUES,broken);
node.style.width = stack.style.width = this.CHTML.pwidth = "100%";
this.CHTML.mwidth = CHTML.Em(this.CHTML.w);
this.CHTML.isMultiline = parent.CHTML.isMultiline = true;
stack.style.verticalAlign = CHTML.Em(state.d - this.CHTML.d);
return node;
},
/****************************************************************/
//
// Locate the next linebreak that is better than the current one
//
CHTMLbetterBreak: function (info,state) {
if (this.isToken) return false; // FIXME: handle breaking of token elements
if (this.isEmbellished()) {
info.embellished = this;
return this.CoreMO().CHTMLbetterBreak(info,state);
}
if (this.linebreakContainer) return false;
//
// Get the current breakpoint position and other data
//
var index = info.index.slice(0), i = info.index.shift(),
m = this.data.length, W, w, scanW, broken = (info.index.length > 0), better = false;
if (i == null) i = -1; if (!broken) {i++; info.W += info.w; info.w = 0}
scanW = info.scanW = info.W; info.nest++;
//
// Look through the line for breakpoints,
// (as long as we are not too far past the breaking width)
//
while (i < m && (info.scanW < PENALTY.maxwidth*CHTML.linebreakWidth || info.w === 0)) {
if (this.data[i]) {
if (this.data[i].CHTMLbetterBreak(info,state)) {
better = true; index = [i].concat(info.index); W = info.W; w = info.w;
if (info.penalty === PENALTY.newline) {
info.index = index;
if (info.nest) {info.nest--}
return true;
}
}
scanW = (broken ? info.scanW : this.CHTMLaddWidth(i,info,scanW));
}
info.index = []; i++; broken = false;
}
if (info.nest) {info.nest--}
info.index = index;
if (better) {info.W = W; info.w = w}
return better;
},
CHTMLaddWidth: function (i,info,scanW) {
if (this.data[i]) {
var bbox = this.data[i].CHTML;
scanW += (bbox.w + (bbox.L||0) + (bbox.R||0)) * (bbox.scale || 1);
info.W = info.scanW = scanW; info.w = 0;
}
return scanW;
},
/****************************************************************/
//
// Create a new line and move the required elements into it
// Position it using proper alignment and indenting
//
CHTMLaddLine: function (stack,start,end,state,values,broken) {
//
// Create a box for the line, with empty BBox
// fill it with the proper elements,
// and clean up the bbox
//
var block = CHTML.addElement(stack,"mjx-block",{},[["mjx-box"]]), line = block.firstChild;
var bbox = state.bbox = CHTML.BBOX.empty();
state.first = broken; state.last = true;
this.CHTMLmoveLine(start,end,line,state,values);
bbox.clean();
//
// Get the alignment and shift values
//
var align = this.CHTMLgetAlign(state,values),
shift = this.CHTMLgetShift(state,values,align,true);
//
// Set the Y offset based on previous depth, leading, and current height
//
var dY = 0;
if (state.n > 0) {
var LHD = CHTML.FONTDATA.baselineskip;
var leading = (state.values.lineleading == null ? state.VALUES : state.values).lineleading * state.scale;
var Y = state.Y;
state.Y -= Math.max(LHD,state.d + bbox.h + leading);
dY = Y - state.Y - state.d - bbox.h;
}
//
// Place the new line
//
if (shift) line.style.margin = "0 "+CHTML.Em(-shift)+" 0 "+CHTML.Em(shift);
if (align !== MML.INDENTALIGN.LEFT) block.style.textAlign = align;
if (dY) block.style.paddingTop = CHTML.Em(dY);
state.BBOX.combine(bbox,shift,state.Y);
//
// Save the values needed for the future
//
state.d = state.bbox.d; state.values = values; state.n++;
},
/****************************************************************/
//
// Get alignment and shift values from the given data
//
CHTMLgetAlign: function (state,values) {
var cur = values, prev = state.values, def = state.VALUES, align;
if (state.n === 0) align = cur.indentalignfirst || prev.indentalignfirst || def.indentalignfirst;
else if (state.isLast) align = prev.indentalignlast || def.indentalignlast;
else align = prev.indentalign || def.indentalign;
if (align === MML.INDENTALIGN.INDENTALIGN) align = prev.indentalign || def.indentalign;
if (align === MML.INDENTALIGN.AUTO) align = (state.isTop ? CONFIG.displayAlign : MML.INDENTALIGN.LEFT);
return align;
},
CHTMLgetShift: function (state,values,align,noadjust) {
var cur = values, prev = state.values, def = state.VALUES, shift;
if (state.n === 0) shift = cur.indentshiftfirst || prev.indentshiftfirst || def.indentshiftfirst;
else if (state.isLast) shift = prev.indentshiftlast || def.indentshiftlast;
else shift = prev.indentshift || def.indentshift;
if (shift === MML.INDENTSHIFT.INDENTSHIFT) shift = prev.indentshift || def.indentshift;
if (shift === "auto" || shift === "") shift = "0";
shift = this.CHTMLlength2em(shift,CHTML.cwidth);
if (state.isTop && CONFIG.displayIndent !== "0") {
var indent = this.CHTMLlength2em(CONFIG.displayIndent,CHTML.cwidth);
shift += (align === MML.INDENTALIGN.RIGHT ? -indent : indent);
}
return (align === MML.INDENTALIGN.RIGHT && !noadjust ? -shift : shift);
},
/****************************************************************/
//
// Move the selected elements into the new line's box,
// moving whole items when possible, and parts of ones
// that are split by a line break.
//
CHTMLmoveLine: function (start,end,node,state,values) {
var i = start[0], j = end[0];
if (i == null) i = -1; if (j == null) j = this.data.length-1;
if (i === j && start.length > 1) {
//
// If starting and ending in the same element move the subpiece to the new line
//
this.data[i].CHTMLmoveSlice(start.slice(1),end.slice(1),node,state,values,"marginLeft");
} else {
//
// Otherwise, move the remainder of the initial item
// and any others up to the last one
//
var last = state.last; state.last = false;
while (i < j) {
if (this.data[i]) {
if (start.length <= 1) this.data[i].CHTMLmoveNode(node,state,values);
else this.data[i].CHTMLmoveSlice(start.slice(1),[],node,state,values,"marginLeft");
}
i++; state.first = false; start = [];
}
//
// If the last item is complete, move it,
// otherwise move the first part of it up to the split
//
state.last = last;
if (this.data[i]) {
if (end.length <= 1) this.data[i].CHTMLmoveNode(node,state,values);
else this.data[i].CHTMLmoveSlice([],end.slice(1),node,state,values,"marginRight");
}
}
},
/****************************************************************/
//
// Split an element and copy the selected items into the new part
//
CHTMLmoveSlice: function (start,end,node,state,values,margin) {
//
// Create a new box for the slice of the element
// Move the selected portion into the slice
// If it is the last slice
// Remove the original (now empty) node
// Rename the Continue-0 node with the original name (for CHTMLnodeElement)
//
var slice = this.CHTMLcreateSliceNode(node);
this.CHTMLmoveLine(start,end,slice,state,values);
if (slice.style[margin]) slice.style[margin] = "";
if (this.CHTML.L) {
if (margin !== "marginLeft") state.bbox.w += this.CHTML.L;
else slice.className = slice.className.replace(/ MJXc-space\d/,"");
}
if (this.CHTML.R && margin !== "marginRight") state.bbox.w += this.CHTML.R;
if (end.length === 0) {
node = this.CHTMLnodeElement();
if (this.href) node = node.parentNode;
node.parentNode.removeChild(node);
node.nextMathJaxNode.id = node.id;
}
return slice;
},
/****************************************************************/
//
// Create a new node for an element that is split in two
// Clone the original and update its ID.
// Link the old node to the new one so we can find it later
//
CHTMLcreateSliceNode: function (node) {
var NODE = this.CHTMLnodeElement(), n = 0;
if (this.href) NODE = NODE.parentNode;
var LAST = NODE; while (LAST.nextMathJaxNode) {LAST = LAST.nextMathJaxNode; n++}
var SLICE = NODE.cloneNode(false); LAST.nextMathJaxNode = SLICE; SLICE.nextMathJaxNode = null;
SLICE.id += "-MJX-Continue-"+n;
return node.appendChild(SLICE);
},
/****************************************************************/
//
// Move an element from its original node to its new location in
// a split element or the new line's node
//
CHTMLmoveNode: function (line,state,values) {
// FIXME: handle linebreakstyle === "duplicate"
// FIXME: handle linebreakmultchar
if (!(state.first || state.last) ||
(state.first && state.values.linebreakstyle === MML.LINEBREAKSTYLE.BEFORE) ||
(state.last && values.linebreakstyle === MML.LINEBREAKSTYLE.AFTER)) {
//
// Move node
//
var node = this.CHTMLnodeElement();
if (this.href) node = node.parentNode;
line.appendChild(node);
if (this.CHTML.pwidth && !line.style.width) line.style.width = this.CHTML.pwidth;
//
// If it is last, remove right margin
// If it is first, remove left margin
//
if (state.last) node.style.marginRight = "";
if (state.first || state.nextIsFirst) {
node.style.marginLeft = ""; this.CHTML.L = 0;
node.className = node.className.replace(/ MJXc-space\d/,"");
}
if (state.first && this.CHTML.w === 0) state.nextIsFirst = true;
else delete state.nextIsFirst;
//
// Update bounding box
//
state.bbox.combine(this.CHTML,state.bbox.w,0);
}
}
});
/**************************************************************************/
MML.mfenced.Augment({
CHTMLbetterBreak: function (info,state) {
//
// Get the current breakpoint position and other data
//
var index = info.index.slice(0), i = info.index.shift(),
m = this.data.length, W, w, scanW, broken = (info.index.length > 0), better = false;
if (i == null) i = -1; if (!broken) {i++; info.W += info.w; info.w = 0}
scanW = info.scanW = info.W; info.nest++;
//
// Create indices that include the delimiters and separators
//
if (!this.dataI) {
this.dataI = [];
if (this.data.open) this.dataI.push("open");
if (m) this.dataI.push(0);
for (var j = 1; j < m; j++) {
if (this.data["sep"+j]) this.dataI.push("sep"+j);
this.dataI.push(j);
}
if (this.data.close) this.dataI.push("close");
}
m = this.dataI.length;
//
// Look through the line for breakpoints, including the open, close, and separators
// (as long as we are not too far past the breaking width)
//
while (i < m && (info.scanW < PENALTY.maxwidth*CHTML.linebreakWidth || info.w === 0)) {
var k = this.dataI[i];
if (this.data[k]) {
if (this.data[k].CHTMLbetterBreak(info,state)) {
better = true; index = [i].concat(info.index); W = info.W; w = info.w;
if (info.penalty === PENALTY.newline) {
info.index = index;
if (info.nest) info.nest--;
return true;
}
}
scanW = (broken ? info.scanW : this.CHTMLaddWidth(i,info,scanW));
}
info.index = []; i++; broken = false;
}
if (info.nest) info.nest--;
info.index = index;
if (better) {info.W = W; info.w = w}
return better;
},
CHTMLmoveLine: function (start,end,node,state,values) {
var i = start[0], j = end[0];
if (i == null) i = -1; if (j == null) j = this.dataI.length-1;
if (i === j && start.length > 1) {
//
// If starting and ending in the same element move the subpiece to the new line
//
this.data[this.dataI[i]].CHTMLmoveSlice(start.slice(1),end.slice(1),node,state,values,"marginLeft");
} else {
//
// Otherwise, move the remainder of the initial item
// and any others (including open and separators) up to the last one
//
var last = state.last; state.last = false; var k = this.dataI[i];
while (i < j) {
if (this.data[k]) {
if (start.length <= 1) this.data[k].CHTMLmoveNode(node,state,values);
else this.data[k].CHTMLmoveSlice(start.slice(1),[],node,state,values,"marginLeft");
}
i++; k = this.dataI[i]; state.first = false; start = [];
}
//
// If the last item is complete, move it
//
state.last = last;
if (this.data[k]) {
if (end.length <= 1) this.data[k].CHTMLmoveNode(node,state,values);
else this.data[k].CHTMLmoveSlice([],end.slice(1),node,state,values,"marginRight");
}
}
}
});
/**************************************************************************/
MML.msubsup.Augment({
CHTMLbetterBreak: function (info,state) {
if (!this.data[this.base]) {return false}
//
// Get the current breakpoint position and other data
//
var index = info.index.slice(0), i = info.index.shift(),
W, w, scanW, broken = (info.index.length > 0), better = false;
if (!broken) {info.W += info.w; info.w = 0}
scanW = info.scanW = info.W;
//
// Record the width of the base and the super- and subscripts
//
if (i == null) {
this.CHTML.baseW = this.data[this.base].CHTML.w;
this.CHTML.dw = this.CHTML.w - this.CHTML.baseW;
}
//
// Check if the base can be broken
//
if (this.data[this.base].CHTMLbetterBreak(info,state)) {
better = true; index = [this.base].concat(info.index); W = info.W; w = info.w;
if (info.penalty === PENALTY.newline) better = broken = true;
}
//
// Add in the base if it is unbroken, and add the scripts
//
if (!broken) this.CHTMLaddWidth(this.base,info,scanW);
info.scanW += this.CHTML.dw; info.W = info.scanW;
info.index = []; if (better) {info.W = W; info.w = w; info.index = index}
return better;
},
CHTMLmoveLine: function (start,end,node,state,values) {
//
// Move the proper part of the base
//
if (this.data[this.base]) {
var base = CHTML.addElement(node,"mjx-base");
if (start.length > 1) {
this.data[this.base].CHTMLmoveSlice(start.slice(1),end.slice(1),base,state,values,"marginLeft");
} else {
if (end.length <= 1) this.data[this.base].CHTMLmoveNode(base,state,values);
else this.data[this.base].CHTMLmoveSlice([],end.slice(1),base,state,values,"marginRight");
}
}
//
// If this is the end, check for super and subscripts, and move those
// by moving the elements that contains them. Adjust the bounding box
// to include the super and subscripts.
//
if (end.length === 0) {
var NODE = this.CHTMLnodeElement(),
stack = CHTML.getNode(NODE,"mjx-stack"),
sup = CHTML.getNode(NODE,"mjx-sup"),
sub = CHTML.getNode(NODE,"mjx-sub");
if (stack) node.appendChild(stack);
else if (sup) node.appendChild(sup);
else if (sub) node.appendChild(sub);
var w = state.bbox.w, bbox;
if (sup) {
bbox = this.data[this.sup].CHTML;
state.bbox.combine(bbox,w,bbox.Y);
}
if (sub) {
bbox = this.data[this.sub].CHTML;
state.bbox.combine(bbox,w,bbox.Y);
}
}
}
});
/**************************************************************************/
MML.mmultiscripts.Augment({
CHTMLbetterBreak: function (info,state) {
if (!this.data[this.base]) return false;
//
// Get the current breakpoint position and other data
//
var index = info.index.slice(0); info.index.shift();
var W, w, scanW, broken = (info.index.length > 0), better = false;
if (!broken) {info.W += info.w; info.w = 0}
info.scanW = info.W;
//
// Get the bounding boxes and the width of the scripts
//
var bbox = this.CHTML, base = this.data[this.base].CHTML;
var dw = bbox.w - base.w - bbox.X;
//
// Add in the width of the prescripts
//
info.scanW += bbox.X; scanW = info.scanW;
//
// Check if the base can be broken
//
if (this.data[this.base].CHTMLbetterBreak(info,state)) {
better = true; index = [this.base].concat(info.index); W = info.W; w = info.w;
if (info.penalty === PENALTY.newline) better = broken = true;
}
//
// Add in the base if it is unbroken, and add the scripts
//
if (!broken) this.CHTMLaddWidth(this.base,info,scanW);
info.scanW += dw; info.W = info.scanW;
info.index = []; if (better) {info.W = W; info.w = w; info.index = index}
return better;
},
CHTMLmoveLine: function (start,end,node,state,values) {
var NODE, BOX = this.CHTMLbbox, w;
//
// If this is the start, move the prescripts, if any.
//
if (start.length < 1) {
NODE = this.CHTMLnodeElement();
var prestack = CHTML.getNode(NODE,"mjx-prestack"),
presup = CHTML.getNode(NODE,"mjx-presup"),
presub = CHTML.getNode(NODE,"mjx-presub");
if (prestack) node.appendChild(prestack);
else if (presup) node.appendChild(presup);
else if (presub) node.appendChild(presub);
w = state.bbox.w;
if (presup) state.bbox.combine(BOX.presup,w+BOX.presup.X,BOX.presup.Y);
if (presub) state.bbox.combine(BOX.presub,w+BOX.presub.X,BOX.presub.Y);
}
//
// Move the proper part of the base
//
if (this.data[this.base]) {
var base = CHTML.addElement(node,"mjx-base");
if (start.length > 1) {
this.data[this.base].CHTMLmoveSlice(start.slice(1),end.slice(1),base,state,values,"marginLeft");
} else {
if (end.length <= 1) this.data[this.base].CHTMLmoveNode(base,state,values);
else this.data[this.base].CHTMLmoveSlice([],end.slice(1),base,state,values,"marginRight");
}
}
//
// If this is the end, check for super and subscripts, and move those
// by moving the elements that contains them. Adjust the bounding box
// to include the super and subscripts.
//
if (end.length === 0) {
NODE = this.CHTMLnodeElement();
var stack = CHTML.getNode(NODE,"mjx-stack"),
sup = CHTML.getNode(NODE,"mjx-sup"),
sub = CHTML.getNode(NODE,"mjx-sub");
if (stack) node.appendChild(stack);
else if (sup) node.appendChild(sup);
else if (sub) node.appendChild(sub);
w = state.bbox.w;
if (sup) state.bbox.combine(BOX.sup,w,BOX.sup.Y);
if (sub) state.bbox.combine(BOX.sub,w,BOX.sub.Y);
}
}
});
/**************************************************************************/
MML.mo.Augment({
//
// Override the method for checking line breaks to properly handle <mo>
//
CHTMLbetterBreak: function (info,state) {
if (info.values && info.values.id === this.CHTMLnodeID) return false;
var values = this.getValues(
"linebreak","linebreakstyle","lineleading","linebreakmultchar",
"indentalign","indentshift",
"indentalignfirst","indentshiftfirst",
"indentalignlast","indentshiftlast",
"texClass", "fence"
);
if (values.linebreakstyle === MML.LINEBREAKSTYLE.INFIXLINEBREAKSTYLE)
values.linebreakstyle = this.Get("infixlinebreakstyle");
//
// Adjust nesting by TeX class (helps output that does not include
// mrows for nesting, but can leave these unbalanced.
//
if (values.texClass === MML.TEXCLASS.OPEN) info.nest++;
if (values.texClass === MML.TEXCLASS.CLOSE && info.nest) info.nest--;
//
// Get the default penalty for this location
//
var W = info.scanW; delete info.embellished;
var w = this.CHTML.w + (this.CHTML.L||0) + (this.CHTML.R||0);
if (values.linebreakstyle === MML.LINEBREAKSTYLE.AFTER) {W += w; w = 0}
if (W - info.shift === 0 && values.linebreak !== MML.LINEBREAK.NEWLINE)
return false; // don't break at zero width (FIXME?)
var offset = CHTML.linebreakWidth - W;
// Adjust offest for explicit first-line indent and align
if (state.n === 0 && (values.indentshiftfirst !== state.VALUES.indentshiftfirst ||
values.indentalignfirst !== state.VALUES.indentalignfirst)) {
var align = this.CHTMLgetAlign(state,values),
shift = this.CHTMLgetShift(state,values,align);
offset += (info.shift - shift);
}
//
var penalty = Math.floor(offset / CHTML.linebreakWidth * 1000);
if (penalty < 0) penalty = PENALTY.toobig - 3*penalty;
if (values.fence) penalty += PENALTY.fence;
if ((values.linebreakstyle === MML.LINEBREAKSTYLE.AFTER &&
values.texClass === MML.TEXCLASS.OPEN) ||
values.texClass === MML.TEXCLASS.CLOSE) penalty += PENALTY.close;
penalty += info.nest * PENALTY.nestfactor;
//
// Get the penalty for this type of break and
// use it to modify the default penalty
//
var linebreak = PENALTY[values.linebreak||MML.LINEBREAK.AUTO];
if (!MathJax.Object.isArray(linebreak)) {
// for breaks past the width, don't modify penalty
if (offset >= 0) {penalty = linebreak * info.nest}
} else {penalty = Math.max(1,penalty + linebreak[0] * info.nest)}
//
// If the penalty is no better than the current one, return false
// Otherwise save the data for this breakpoint and return true
//
if (penalty >= info.penalty) return false;
info.penalty = penalty; info.values = values; info.W = W; info.w = w;
values.lineleading = this.CHTMLlength2em(values.lineleading,state.VALUES.lineleading);
values.id = this.CHTMLnodeID;
return true;
}
});
/**************************************************************************/
MML.mspace.Augment({
//
// Override the method for checking line breaks to properly handle <mspace>
//
CHTMLbetterBreak: function (info,state) {
if (info.values && info.values.id === this.CHTMLnodeID) return false;
var values = this.getValues("linebreak");
var linebreakValue = values.linebreak;
if (!linebreakValue || this.hasDimAttr()) {
// The MathML spec says that the linebreak attribute should be ignored
// if any dimensional attribute is set.
linebreakValue = MML.LINEBREAK.AUTO;
}
//
// Get the default penalty for this location
//
var W = info.scanW, w = this.CHTML.w + (this.CHTML.L||0) + (this.CHTML.R||0);
if (W - info.shift === 0) return false; // don't break at zero width (FIXME?)
var offset = CHTML.linebreakWidth - W;
//
var penalty = Math.floor(offset / CHTML.linebreakWidth * 1000);
if (penalty < 0) penalty = PENALTY.toobig - 3*penalty;
penalty += info.nest * PENALTY.nestfactor;
//
// Get the penalty for this type of break and
// use it to modify the default penalty
//
var linebreak = PENALTY[linebreakValue];
if (linebreakValue === MML.LINEBREAK.AUTO && w >= PENALTY.spacelimit &&
!this.mathbackground && !this.background)
linebreak = [(w+PENALTY.spaceoffset)*PENALTY.spacefactor];
if (!MathJax.Object.isArray(linebreak)) {
// for breaks past the width, don't modify penalty
if (offset >= 0) {penalty = linebreak * info.nest}
} else {penalty = Math.max(1,penalty + linebreak[0] * info.nest)}
//
// If the penalty is no better than the current one, return false
// Otherwise save the data for this breakpoint and return true
//
if (penalty >= info.penalty) return false;
info.penalty = penalty; info.values = values; info.W = W; info.w = w;
values.lineleading = state.VALUES.lineleading;
values.linebreakstyle = "before"; values.id = this.CHTMLnodeID;
return true;
}
});
//
// Hook into the mathchoice extension
//
MathJax.Hub.Register.StartupHook("TeX mathchoice Ready",function () {
MML.TeXmathchoice.Augment({
CHTMLbetterBreak: function (info,state) {
return this.Core().CHTMLbetterBreak(info,state);
},
CHTMLmoveLine: function (start,end,node,state,values) {
return this.Core().CHTMLmoveSlice(start,end,node,state,values);
}
});
});
//
// Have maction process only the selected item
//
MML.maction.Augment({
CHTMLbetterBreak: function (info,state) {
return this.Core().CHTMLbetterBreak(info,state);
},
CHTMLmoveLine: function (start,end,node,state,values) {
return this.Core().CHTMLmoveSlice(start,end,node,state,values);
}
});
//
// Have semantics only do the first element
// (FIXME: do we need to do anything special about annotation-xml?)
//
MML.semantics.Augment({
CHTMLbetterBreak: function (info,state) {
return (this.data[0] ? this.data[0].CHTMLbetterBreak(info,state) : false);
},
CHTMLmoveLine: function (start,end,node,state,values) {
return (this.data[0] ? this.data[0].CHTMLmoveSlice(start,end,node,state,values) : null);
}
});
/**************************************************************************/
MathJax.Hub.Startup.signal.Post("CommonHTML multiline Ready");
MathJax.Ajax.loadComplete(CHTML.autoloadDir+"/multiline.js");
});