34 lines
1003 B
JavaScript
34 lines
1003 B
JavaScript
|
"use strict";
|
||
|
|
|
||
|
|
var memo = {};
|
||
|
|
|
||
|
|
/* istanbul ignore next */
|
||
|
|
function getTarget(target) {
|
||
|
|
if (typeof memo[target] === "undefined") {
|
||
|
|
var styleTarget = document.querySelector(target);
|
||
|
|
|
||
|
|
// Special case to return head of iframe instead of iframe itself
|
||
|
|
if (window.HTMLIFrameElement && styleTarget instanceof window.HTMLIFrameElement) {
|
||
|
|
try {
|
||
|
|
// This will throw an exception if access to iframe is blocked
|
||
|
|
// due to cross-origin restrictions
|
||
|
|
styleTarget = styleTarget.contentDocument.head;
|
||
|
|
} catch (e) {
|
||
|
|
// istanbul ignore next
|
||
|
|
styleTarget = null;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
memo[target] = styleTarget;
|
||
|
|
}
|
||
|
|
return memo[target];
|
||
|
|
}
|
||
|
|
|
||
|
|
/* istanbul ignore next */
|
||
|
|
function insertBySelector(insert, style) {
|
||
|
|
var target = getTarget(insert);
|
||
|
|
if (!target) {
|
||
|
|
throw new Error("Couldn't find a style target. This probably means that the value for the 'insert' parameter is invalid.");
|
||
|
|
}
|
||
|
|
target.appendChild(style);
|
||
|
|
}
|
||
|
|
module.exports = insertBySelector;
|