$

node_modules/riot/esm/core/css-manager.js

@@ -0,0 +1,73 @@
+/* Riot WIP, @license MIT */
+import $ from 'bianco.query';
+import { set } from 'bianco.attr';
+
+const CSS_BY_NAME = new Map();
+const STYLE_NODE_SELECTOR = 'style[riot]'; // memoized curried function
+
+const getStyleNode = (style => {
+  return () => {
+    // lazy evaluation:
+    // if this function was already called before
+    // we return its cached result
+    if (style) return style; // create a new style element or use an existing one
+    // and cache it internally
+
+    style = $(STYLE_NODE_SELECTOR)[0] || document.createElement('style');
+    set(style, 'type', 'text/css');
+    /* istanbul ignore next */
+
+    if (!style.parentNode) document.head.appendChild(style);
+    return style;
+  };
+})();
+/**
+ * Object that will be used to inject and manage the css of every tag instance
+ */
+
+
+const cssManager = {
+  CSS_BY_NAME,
+
+  /**
+   * Save a tag style to be later injected into DOM
+   * @param { string } name - if it's passed we will map the css to a tagname
+   * @param { string } css - css string
+   * @returns {Object} self
+   */
+  add(name, css) {
+    if (!CSS_BY_NAME.has(name)) {
+      CSS_BY_NAME.set(name, css);
+      this.inject();
+    }
+
+    return this;
+  },
+
+  /**
+   * Inject all previously saved tag styles into DOM
+   * innerHTML seems slow: http://jsperf.com/riot-insert-style
+   * @returns {Object} self
+   */
+  inject() {
+    getStyleNode().innerHTML = [...CSS_BY_NAME.values()].join('\n');
+    return this;
+  },
+
+  /**
+   * Remove a tag style from the DOM
+   * @param {string} name a registered tagname
+   * @returns {Object} self
+   */
+  remove(name) {
+    if (CSS_BY_NAME.has(name)) {
+      CSS_BY_NAME.delete(name);
+      this.inject();
+    }
+
+    return this;
+  }
+
+};
+
+export { CSS_BY_NAME, STYLE_NODE_SELECTOR, cssManager as default };