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/**
* 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,
};
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