/usr/lib/python2.7/dist-packages/notebook/static/notebook/js/mathjaxutils.js is in python-notebook 5.2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Distributed under the terms of the Modified BSD License.
define([
'jquery',
'base/js/utils',
'base/js/i18n',
'base/js/dialog',
], function($, utils, dialog) {
"use strict";
var init = function () {
if (window.MathJax) {
// MathJax loaded
MathJax.Hub.Config({
tex2jax: {
inlineMath: [ ['$','$'], ["\\(","\\)"] ],
displayMath: [ ['$$','$$'], ["\\[","\\]"] ],
processEscapes: true,
processEnvironments: true
},
MathML: {
extensions: ['content-mathml.js']
},
// Center justify equations in code and markdown cells. Elsewhere
// we use CSS to left justify single line equations in code cells.
displayAlign: 'center',
"HTML-CSS": {
availableFonts: [],
imageFont: null,
preferredFont: null,
webFont: "STIX-Web",
styles: {'.MathJax_Display': {"margin": 0}},
linebreaks: { automatic: true }
},
});
MathJax.Hub.Configured();
} else if (window.mathjax_url !== "") {
// This statement is used simply so that message extraction
// will pick up the strings. The actual setting of the text
// for the button is in dialog.js.
var button_labels = [ i18n.msg._("OK") ];
// Don't have MathJax, but should. Show dialog.
dialog.modal({
title : i18n.msg.sprintf(i18n.msg._("Failed to retrieve MathJax from '%s'",window.mathjax_url)),
body : $("<p/>").addClass('dialog').text(
i18n.msg._("Math/LaTeX rendering will be disabled.")
),
buttons : {
OK : {class: "btn-danger"}
}
});
}
};
// Some magic for deferring mathematical expressions to MathJax
// by hiding them from the Markdown parser.
// Some of the code here is adapted with permission from Davide Cervone
// under the terms of the Apache2 license governing the MathJax project.
// Other minor modifications are also due to StackExchange and are used with
// permission.
// MATHSPLIT contains the pattern for math delimiters and special symbols
// needed for searching for math in the text input.
var MATHSPLIT = /(\$\$?|\\(?:begin|end)\{[a-z]*\*?\}|\\[{}$]|[{}]|(?:\n\s*)+|@@\d+@@|\\\\(?:\(|\)|\[|\]))/i;
// The math is in blocks i through j, so
// collect it into one block and clear the others.
// Replace &, <, and > by named entities.
// For IE, put <br> at the ends of comments since IE removes \n.
// Clear the current math positions and store the index of the
// math, then push the math string onto the storage array.
// The preProcess function is called on all blocks if it has been passed in
var process_math = function (i, j, pre_process, math, blocks) {
var block = blocks.slice(i, j + 1).join("").replace(/&/g, "&") // use HTML entity for &
.replace(/</g, "<") // use HTML entity for <
.replace(/>/g, ">") // use HTML entity for >
;
if (utils.browser === 'msie') {
block = block.replace(/(%[^\n]*)\n/g, "$1<br/>\n");
}
while (j > i) {
blocks[j] = "";
j--;
}
blocks[i] = "@@" + math.length + "@@"; // replace the current block text with a unique tag to find later
if (pre_process){
block = pre_process(block);
}
math.push(block);
return blocks;
};
// Break up the text into its component parts and search
// through them for math delimiters, braces, linebreaks, etc.
// Math delimiters must match and braces must balance.
// Don't allow math to pass through a double linebreak
// (which will be a paragraph).
//
var remove_math = function (text) {
var math = []; // stores math strings for later
var start;
var end;
var last;
var braces;
// Except for extreme edge cases, this should catch precisely those pieces of the markdown
// source that will later be turned into code spans. While MathJax will not TeXify code spans,
// we still have to consider them at this point; the following issue has happened several times:
//
// `$foo` and `$bar` are varibales. --> <code>$foo ` and `$bar</code> are variables.
var hasCodeSpans = /`/.test(text),
de_tilde;
if (hasCodeSpans) {
text = text.replace(/~/g, "~T").replace(/(^|[^\\])(`+)([^\n]*?[^`\n])\2(?!`)/gm, function (wholematch) {
return wholematch.replace(/\$/g, "~D");
});
de_tilde = function (text) {
return text.replace(/~([TD])/g, function (wholematch, character) {
return { T: "~", D: "$" }[character];
});
};
} else {
de_tilde = function (text) { return text; };
}
var blocks = utils.regex_split(text.replace(/\r\n?/g, "\n"),MATHSPLIT);
for (var i = 1, m = blocks.length; i < m; i += 2) {
var block = blocks[i];
if (block.charAt(0) === "@") {
//
// Things that look like our math markers will get
// stored and then retrieved along with the math.
//
blocks[i] = "@@" + math.length + "@@";
math.push(block);
}
else if (start) {
//
// If we are in math, look for the end delimiter,
// but don't go past double line breaks, and
// and balance braces within the math.
//
if (block === end) {
if (braces) {
last = i;
}
else {
blocks = process_math(start, i, de_tilde, math, blocks);
start = null;
end = null;
last = null;
}
}
else if (block.match(/\n.*\n/)) {
if (last) {
i = last;
blocks = process_math(start, i, de_tilde, math, blocks);
}
start = null;
end = null;
last = null;
braces = 0;
}
else if (block === "{") {
braces++;
}
else if (block === "}" && braces) {
braces--;
}
}
else {
//
// Look for math start delimiters and when
// found, set up the end delimiter.
//
if (block === "$" || block === "$$") {
start = i;
end = block;
braces = 0;
}
else if (block === "\\\\\(" || block === "\\\\\[") {
start = i;
end = block.slice(-1) === "(" ? "\\\\\)" : "\\\\\]";
braces = 0;
}
else if (block.substr(1, 5) === "begin") {
start = i;
end = "\\end" + block.substr(6);
braces = 0;
}
}
}
if (last) {
blocks = process_math(start, last, de_tilde, math, blocks);
start = null;
end = null;
last = null;
}
return [de_tilde(blocks.join("")), math];
};
//
// Put back the math strings that were saved,
// and clear the math array (no need to keep it around).
//
var replace_math = function (text, math) {
//
// Replaces a math placeholder with its corresponding group.
// The math delimiters "\\(", "\\[", "\\)" and "\\]" are replaced
// removing one backslash in order to be interpreted correctly by MathJax.
//
var math_group_process = function (match, n) {
var math_group = math[n];
if (math_group.substr(0, 3) === "\\\\\(" && math_group.substr(math_group.length - 3) === "\\\\\)") {
math_group = "\\\(" + math_group.substring(3, math_group.length - 3) + "\\\)";
} else if (math_group.substr(0, 3) === "\\\\\[" && math_group.substr(math_group.length - 3) === "\\\\\]") {
math_group = "\\\[" + math_group.substring(3, math_group.length - 3) + "\\\]";
}
return math_group;
};
// Replace all the math group placeholders in the text
// with the saved strings.
text = text.replace(/@@(\d+)@@/g, math_group_process);
return text;
};
var mathjaxutils = {
init : init,
remove_math : remove_math,
replace_math : replace_math
};
return mathjaxutils;
});
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