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author | Christopher Speller <crspeller@gmail.com> | 2016-03-14 08:50:46 -0400 |
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committer | Christopher Speller <crspeller@gmail.com> | 2016-03-16 18:02:55 -0400 |
commit | 12896bd23eeba79884245c1c29fdc568cf21a7fa (patch) | |
tree | 4e7f83d3e2564b9b89d669e9f7905ff11768b11a /webapp/non_npm_dependencies/katex/src/utils.js | |
parent | 29fe6a3d13c9c7aa490fffebbe5d1b5fdf1e3090 (diff) | |
download | chat-12896bd23eeba79884245c1c29fdc568cf21a7fa.tar.gz chat-12896bd23eeba79884245c1c29fdc568cf21a7fa.tar.bz2 chat-12896bd23eeba79884245c1c29fdc568cf21a7fa.zip |
Converting to Webpack. Stage 1.
Diffstat (limited to 'webapp/non_npm_dependencies/katex/src/utils.js')
-rw-r--r-- | webapp/non_npm_dependencies/katex/src/utils.js | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/webapp/non_npm_dependencies/katex/src/utils.js b/webapp/non_npm_dependencies/katex/src/utils.js new file mode 100644 index 000000000..f9e57cc65 --- /dev/null +++ b/webapp/non_npm_dependencies/katex/src/utils.js @@ -0,0 +1,106 @@ +/** + * This file contains a list of utility functions which are useful in other + * files. + */ + +/** + * Provide an `indexOf` function which works in IE8, but defers to native if + * possible. + */ +var nativeIndexOf = Array.prototype.indexOf; +var indexOf = function(list, elem) { + if (list == null) { + return -1; + } + if (nativeIndexOf && list.indexOf === nativeIndexOf) { + return list.indexOf(elem); + } + var i = 0; + var l = list.length; + for (; i < l; i++) { + if (list[i] === elem) { + return i; + } + } + return -1; +}; + +/** + * Return whether an element is contained in a list + */ +var contains = function(list, elem) { + return indexOf(list, elem) !== -1; +}; + +/** + * Provide a default value if a setting is undefined + */ +var deflt = function(setting, defaultIfUndefined) { + return setting === undefined ? defaultIfUndefined : setting; +}; + +// hyphenate and escape adapted from Facebook's React under Apache 2 license + +var uppercase = /([A-Z])/g; +var hyphenate = function(str) { + return str.replace(uppercase, "-$1").toLowerCase(); +}; + +var ESCAPE_LOOKUP = { + "&": "&", + ">": ">", + "<": "<", + "\"": """, + "'": "'", +}; + +var ESCAPE_REGEX = /[&><"']/g; + +function escaper(match) { + return ESCAPE_LOOKUP[match]; +} + +/** + * Escapes text to prevent scripting attacks. + * + * @param {*} text Text value to escape. + * @return {string} An escaped string. + */ +function escape(text) { + return ("" + text).replace(ESCAPE_REGEX, escaper); +} + +/** + * A function to set the text content of a DOM element in all supported + * browsers. Note that we don't define this if there is no document. + */ +var setTextContent; +if (typeof document !== "undefined") { + var testNode = document.createElement("span"); + if ("textContent" in testNode) { + setTextContent = function(node, text) { + node.textContent = text; + }; + } else { + setTextContent = function(node, text) { + node.innerText = text; + }; + } +} + +/** + * A function to clear a node. + */ +function clearNode(node) { + setTextContent(node, ""); +} + +module.exports = { + contains: contains, + deflt: deflt, + escape: escape, + hyphenate: hyphenate, + indexOf: indexOf, + setTextContent: setTextContent, + clearNode: clearNode, +}; |