mirror of
https://github.com/kovidgoyal/calibre.git
synced 2025-10-31 02:27:01 -04:00
262 lines
10 KiB
JavaScript
262 lines
10 KiB
JavaScript
/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
|
|
/* vim: set ts=2 et sw=2 tw=80: */
|
|
|
|
/*************************************************************
|
|
*
|
|
* MathJax/extensions/mml2jax.js
|
|
*
|
|
* Implements the MathML to Jax preprocessor that locates <math> nodes
|
|
* within the text of a document and replaces them with SCRIPT tags
|
|
* for processing by MathJax.
|
|
*
|
|
* ---------------------------------------------------------------------
|
|
*
|
|
* Copyright (c) 2010-2015 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.Extension.mml2jax = {
|
|
version: "2.6.0",
|
|
config: {
|
|
preview: "mathml" // Use the <math> element as the
|
|
// preview. Set to "none" for no preview,
|
|
// set to "alttext" to use the alttext attribute
|
|
// of the <math> element, set to "altimg" to use
|
|
// an image described by the altimg* attributes
|
|
// or set to an array specifying an HTML snippet
|
|
// to use a fixed preview for all math
|
|
|
|
},
|
|
MMLnamespace: "http://www.w3.org/1998/Math/MathML",
|
|
|
|
PreProcess: function (element) {
|
|
if (!this.configured) {
|
|
this.config = MathJax.Hub.CombineConfig("mml2jax",this.config);
|
|
if (this.config.Augment) {MathJax.Hub.Insert(this,this.config.Augment)}
|
|
this.InitBrowser();
|
|
this.configured = true;
|
|
}
|
|
if (typeof(element) === "string") {element = document.getElementById(element)}
|
|
if (!element) {element = document.body}
|
|
var mathArray = [];
|
|
//
|
|
// Handle all math tags with no namespaces
|
|
//
|
|
this.PushMathElements(mathArray,element,"math");
|
|
//
|
|
// Handle math with namespaces in XHTML
|
|
//
|
|
this.PushMathElements(mathArray,element,"math",this.MMLnamespace);
|
|
//
|
|
// Handle math with namespaces in HTML
|
|
//
|
|
var i, m;
|
|
if (typeof(document.namespaces) !== "undefined") {
|
|
//
|
|
// IE namespaces are listed in document.namespaces
|
|
//
|
|
try {
|
|
for (i = 0, m = document.namespaces.length; i < m; i++) {
|
|
var ns = document.namespaces[i];
|
|
if (ns.urn === this.MMLnamespace)
|
|
{this.PushMathElements(mathArray,element,ns.name+":math")}
|
|
}
|
|
} catch (err) {}
|
|
} else {
|
|
//
|
|
// Everybody else
|
|
//
|
|
var html = document.getElementsByTagName("html")[0];
|
|
if (html) {
|
|
for (i = 0, m = html.attributes.length; i < m; i++) {
|
|
var attr = html.attributes[i];
|
|
if (attr.nodeName.substr(0,6) === "xmlns:" && attr.nodeValue === this.MMLnamespace)
|
|
{this.PushMathElements(mathArray,element,attr.nodeName.substr(6)+":math")}
|
|
}
|
|
}
|
|
}
|
|
this.ProcessMathArray(mathArray);
|
|
},
|
|
|
|
PushMathElements: function (array,element,name,namespace) {
|
|
var math, preview = MathJax.Hub.config.preRemoveClass;
|
|
if (namespace) {
|
|
if (!element.getElementsByTagNameNS) return;
|
|
math = element.getElementsByTagNameNS(namespace,name);
|
|
} else {
|
|
math = element.getElementsByTagName(name);
|
|
}
|
|
for (var i = 0, m = math.length; i < m; i++) {
|
|
var parent = math[i].parentNode;
|
|
if (parent && parent.className !== preview &&
|
|
!parent.isMathJax && !math[i].prefix === !namespace) array.push(math[i]);
|
|
}
|
|
},
|
|
|
|
ProcessMathArray: function (math) {
|
|
var i, m = math.length;
|
|
if (m) {
|
|
if (this.MathTagBug) {
|
|
for (i = 0; i < m; i++) {
|
|
if (math[i].nodeName === "MATH") {this.ProcessMathFlattened(math[i])}
|
|
else {this.ProcessMath(math[i])}
|
|
}
|
|
} else {
|
|
for (i = 0; i < m; i++) {this.ProcessMath(math[i])}
|
|
}
|
|
}
|
|
},
|
|
|
|
ProcessMath: function (math) {
|
|
var parent = math.parentNode;
|
|
if (!parent || parent.className === MathJax.Hub.config.preRemoveClass) return;
|
|
var script = document.createElement("script");
|
|
script.type = "math/mml";
|
|
parent.insertBefore(script,math);
|
|
if (this.AttributeBug) {
|
|
var html = this.OuterHTML(math);
|
|
if (this.CleanupHTML) {
|
|
html = html.replace(/<\?import .*?>/i,"").replace(/<\?xml:namespace .*?\/>/i,"");
|
|
html = html.replace(/ /g," ");
|
|
}
|
|
MathJax.HTML.setScript(script,html); parent.removeChild(math);
|
|
} else {
|
|
var span = MathJax.HTML.Element("span"); span.appendChild(math);
|
|
MathJax.HTML.setScript(script,span.innerHTML);
|
|
}
|
|
if (this.config.preview !== "none") {this.createPreview(math,script)}
|
|
},
|
|
|
|
ProcessMathFlattened: function (math) {
|
|
var parent = math.parentNode;
|
|
if (!parent || parent.className === MathJax.Hub.config.preRemoveClass) return;
|
|
var script = document.createElement("script");
|
|
script.type = "math/mml";
|
|
parent.insertBefore(script,math);
|
|
var mml = "", node, MATH = math;
|
|
while (math && math.nodeName !== "/MATH") {
|
|
node = math; math = math.nextSibling;
|
|
mml += this.NodeHTML(node);
|
|
node.parentNode.removeChild(node);
|
|
}
|
|
if (math && math.nodeName === "/MATH") {math.parentNode.removeChild(math)}
|
|
script.text = mml + "</math>";
|
|
if (this.config.preview !== "none") {this.createPreview(MATH,script)}
|
|
},
|
|
|
|
NodeHTML: function (node) {
|
|
var html, i, m;
|
|
if (node.nodeName === "#text") {
|
|
html = this.quoteHTML(node.nodeValue);
|
|
} else if (node.nodeName === "#comment") {
|
|
html = "<!--" + node.nodeValue + "-->"
|
|
} else {
|
|
// In IE, outerHTML doesn't properly quote attributes, so quote them by hand
|
|
// In Opera, HTML special characters aren't quoted in attributes, so quote them
|
|
html = "<"+node.nodeName.toLowerCase();
|
|
for (i = 0, m = node.attributes.length; i < m; i++) {
|
|
var attribute = node.attributes[i];
|
|
if (attribute.specified && attribute.nodeName.substr(0,10) !== "_moz-math-") {
|
|
// Opera 11.5 beta turns xmlns into xmlns:xmlns, so put it back (*** check after 11.5 is out ***)
|
|
html += " "+attribute.nodeName.toLowerCase().replace(/xmlns:xmlns/,"xmlns")+"=";
|
|
var value = attribute.nodeValue; // IE < 8 doesn't properly set style by setAttributes
|
|
if (value == null && attribute.nodeName === "style" && node.style) {value = node.style.cssText}
|
|
html += '"'+this.quoteHTML(value)+'"';
|
|
}
|
|
}
|
|
html += ">";
|
|
// Handle internal HTML (possibly due to <semantics> annotation or missing </math>)
|
|
if (node.outerHTML != null && node.outerHTML.match(/(.<\/[A-Z]+>|\/>)$/)) {
|
|
for (i = 0, m = node.childNodes.length; i < m; i++)
|
|
{html += this.OuterHTML(node.childNodes[i])}
|
|
html += "</"+node.nodeName.toLowerCase()+">";
|
|
}
|
|
}
|
|
return html;
|
|
},
|
|
OuterHTML: function (node) {
|
|
if (node.nodeName.charAt(0) === "#") {return this.NodeHTML(node)}
|
|
if (!this.AttributeBug) {return node.outerHTML}
|
|
var html = this.NodeHTML(node);
|
|
for (var i = 0, m = node.childNodes.length; i < m; i++)
|
|
{html += this.OuterHTML(node.childNodes[i]);}
|
|
html += "</"+node.nodeName.toLowerCase()+">";
|
|
return html;
|
|
},
|
|
quoteHTML: function (string) {
|
|
if (string == null) {string = ""}
|
|
return string.replace(/&/g,"&").replace(/</g,"<").replace(/>/g,">").replace(/\"/g,""");
|
|
},
|
|
|
|
createPreview: function (math,script) {
|
|
var preview = this.config.preview;
|
|
if (preview === "none") return;
|
|
var isNodePreview = false;
|
|
if (preview === "mathml") {
|
|
isNodePreview = true;
|
|
// mathml preview does not work with IE < 9, so fallback to alttext.
|
|
if (this.MathTagBug) {preview = "alttext"} else {preview = math.cloneNode(true)}
|
|
}
|
|
if (preview === "alttext" || preview === "altimg") {
|
|
isNodePreview = true;
|
|
var alttext = this.filterPreview(math.getAttribute("alttext"));
|
|
if (preview === "alttext") {
|
|
if (alttext != null) {preview = MathJax.HTML.TextNode(alttext)} else {preview = null}
|
|
} else {
|
|
var src = math.getAttribute("altimg");
|
|
if (src != null) {
|
|
// FIXME: use altimg-valign when display="inline"?
|
|
var style = {width: math.getAttribute("altimg-width"), height: math.getAttribute("altimg-height")};
|
|
preview = MathJax.HTML.Element("img",{src:src,alt:alttext,style:style});
|
|
} else {preview = null}
|
|
}
|
|
}
|
|
if (preview) {
|
|
var span;
|
|
if (isNodePreview) {
|
|
span = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass});
|
|
span.appendChild(preview);
|
|
} else {
|
|
span = MathJax.HTML.Element("span",{className:MathJax.Hub.config.preRemoveClass},preview);
|
|
}
|
|
script.parentNode.insertBefore(span,script);
|
|
}
|
|
},
|
|
|
|
filterPreview: function (text) {return text},
|
|
|
|
InitBrowser: function () {
|
|
var test = MathJax.HTML.Element("span",{id:"<", className: "mathjax", innerHTML: "<math><mi>x</mi><mspace /></math>"});
|
|
var html = test.outerHTML || "";
|
|
this.AttributeBug = html !== "" && !(
|
|
html.match(/id="<"/) && // "<" should convert to "<"
|
|
html.match(/class="mathjax"/) && // IE leaves out quotes
|
|
html.match(/<\/math>/) // Opera 9 drops tags after self-closing tags
|
|
);
|
|
this.MathTagBug = test.childNodes.length > 1; // IE < 9 flattens unknown tags
|
|
this.CleanupHTML = MathJax.Hub.Browser.isMSIE; // remove namespace and other added tags
|
|
}
|
|
|
|
};
|
|
|
|
//
|
|
// We register the preprocessors with the following priorities:
|
|
// - mml2jax.js: 5
|
|
// - jsMath2jax.js: 8
|
|
// - asciimath2jax.js, tex2jax.js: 10 (default)
|
|
// See issues 18 and 484 and the other *2jax.js files.
|
|
//
|
|
MathJax.Hub.Register.PreProcessor(["PreProcess",MathJax.Extension.mml2jax],5);
|
|
MathJax.Ajax.loadComplete("[MathJax]/extensions/mml2jax.js");
|