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Diffstat (limited to 'catapult/third_party/polymer/components/shadycss/src/unscoped-style-handler.js')
-rw-r--r-- | catapult/third_party/polymer/components/shadycss/src/unscoped-style-handler.js | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/catapult/third_party/polymer/components/shadycss/src/unscoped-style-handler.js b/catapult/third_party/polymer/components/shadycss/src/unscoped-style-handler.js new file mode 100644 index 00000000..95e994fa --- /dev/null +++ b/catapult/third_party/polymer/components/shadycss/src/unscoped-style-handler.js @@ -0,0 +1,40 @@ +/** +@license +Copyright (c) 2017 The Polymer Project Authors. All rights reserved. +This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt +The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt +The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt +Code distributed by Google as part of the polymer project is also +subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt +*/ + +'use strict'; + +/** @type {!Set<string>} */ +const styleTextSet = new Set(); + +export const scopingAttribute = 'shady-unscoped'; + +/** + * Add a specifically-marked style to the document directly, and only one copy of that style. + * + * @param {!HTMLStyleElement} style + * @return {undefined} + */ +export function processUnscopedStyle(style) { + const text = style.textContent; + if (!styleTextSet.has(text)) { + styleTextSet.add(text); + const newStyle = style.cloneNode(true); + document.head.appendChild(newStyle); + } +} + +/** + * Check if a style is supposed to be unscoped + * @param {!HTMLStyleElement} style + * @return {boolean} true if the style has the unscoping attribute + */ +export function isUnscopedStyle(style) { + return style.hasAttribute(scopingAttribute); +}
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