//---------------------------------------------------------------------------- // Copyright (C) 2008-2012 The IPython Development Team // // Distributed under the terms of the BSD License. The full license is in // the file COPYING, distributed as part of this software. //---------------------------------------------------------------------------- //============================================================================ // MathJax utility functions //============================================================================ IPython.namespace('IPython.mathjaxutils'); IPython.mathjaxutils = (function (IPython) { var init = function () { if (window.MathJax) { // MathJax loaded MathJax.Hub.Config({ tex2jax: { inlineMath: [ ['$','$'], ["\\(","\\)"] ], displayMath: [ ['$$','$$'], ["\\[","\\]"] ], processEscapes: true, processEnvironments: true }, displayAlign: 'left', // Change this to 'center' to center equations. "HTML-CSS": { styles: {'.MathJax_Display': {"margin": 0}} } }); MathJax.Hub.Configured(); } else if (window.mathjax_url != "") { // Don't have MathJax, but should. Show dialog. var message = $('
') .append( $("

").addClass('dialog').html( "Math/LaTeX rendering will be disabled." ) ).append( $("

").addClass('dialog').html( "If you have administrative access to the notebook server and" + " a working internet connection, you can install a local copy" + " of MathJax for offline use with the following command on the server" + " at a Python or IPython prompt:" ) ).append( $("
").addClass('dialog').html(
                        ">>> from IPython.external import mathjax; mathjax.install_mathjax()"
                    )
                ).append(
                    $("

").addClass('dialog').html( "This will try to install MathJax into the IPython source directory." ) ).append( $("

").addClass('dialog').html( "If IPython is installed to a location that requires" + " administrative privileges to write, you will need to make this call as" + " an administrator, via 'sudo'." ) ).append( $("

").addClass('dialog').html( "When you start the notebook server, you can instruct it to disable MathJax support altogether:" ) ).append( $("
").addClass('dialog').html(
                        "$ ipython notebook --no-mathjax"
                    )
                ).append(
                    $("

").addClass('dialog').html( "which will prevent this dialog from appearing." ) ) IPython.dialog.modal({ title : "Failed to retrieve MathJax from '" + window.mathjax_url + "'", body : message, buttons : { OK : {class: "btn-danger"} } }); } else { // No MathJax, but none expected. No dialog. }; }; // 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. var inline = "$"; // the inline math delimiter var blocks, start, end, last, braces; // used in searching for math var math; // stores math until pagedown (Markdown parser) is done // MATHSPLIT contains the pattern for math delimiters and special symbols // needed for searching for math in the text input. var MATHSPLIT = /(\$\$?|\\(?:begin|end)\{[a-z]*\*?\}|\\[\\{}$]|[{}]|(?:\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
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) { var hub = MathJax.Hub; var block = blocks.slice(i, j + 1).join("").replace(/&/g, "&") // use HTML entity for & .replace(//g, ">") // use HTML entity for > ; if (hub.Browser.isMSIE) { block = block.replace(/(%[^\n]*)\n/g, "$1
\n") } while (j > i) { blocks[j] = ""; j--; } blocks[i] = "@@" + math.length + "@@"; // replace the current block text with a unique tag to find later if (pre_process) block = pre_process(block); math.push(block); start = end = last = null; } // Break up the text into its component parts and search // through them for math delimiters, braces, linebreaks, etc. // Math delimiters must match and braces must balance. // Don't allow math to pass through a double linebreak // (which will be a paragraph). // var remove_math = function (text) { if (!window.MathJax) { return text; } start = end = last = null; // for tracking math delimiters math = []; // stores math strings for later // Except for extreme edge cases, this should catch precisely those pieces of the markdown // source that will later be turned into code spans. While MathJax will not TeXify code spans, // we still have to consider them at this point; the following issue has happened several times: // // `$foo` and `$bar` are varibales. --> $foo ` and `$bar 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; }; } blocks = IPython.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 { process_math(start, i, de_tilde) } } else if (block.match(/\n.*\n/)) { if (last) { i = last; process_math(start, i, de_tilde) } start = end = 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 === inline || block === "$$") { start = i; end = block; braces = 0; } else if (block.substr(1, 5) === "begin") { start = i; end = "\\end" + block.substr(6); braces = 0; } } } if (last) { process_math(start, last, de_tilde) } return de_tilde(blocks.join("")); } // // Put back the math strings that were saved, // and clear the math array (no need to keep it around). // var replace_math = function (text) { if (!window.MathJax) { return text; } text = text.replace(/@@(\d+)@@/g, function (match, n) { return math[n] }); math = null; return text; } return { init : init, process_math : process_math, remove_math : remove_math, replace_math : replace_math }; }(IPython));