1 files changed, 97 insertions, 0 deletions
diff --git a/js/src/dom/selector-engine.js b/js/src/dom/selector-engine.js
new file mode 100644
index 0000000000..eb6b680ac4
--- /dev/null
+++ b/js/src/dom/selector-engine.js
@@ -0,0 +1,97 @@
+/**
+ * --------------------------------------------------------------------------
+ * Bootstrap (v4.3.1): dom/selector-engine.js
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ * --------------------------------------------------------------------------
+ */
+
+import { find as findFn, findOne, matches, closest } from './polyfill'
+import { makeArray } from '../util/index'
+
+/**
+ * ------------------------------------------------------------------------
+ * Constants
+ * ------------------------------------------------------------------------
+ */
+
+const NODE_TEXT = 3
+
+const SelectorEngine = {
+  matches(element, selector) {
+    return matches.call(element, selector)
+  },
+
+  find(selector, element = document.documentElement) {
+    if (typeof selector !== 'string') {
+      return null
+    }
+
+    return findFn.call(element, selector)
+  },
+
+  findOne(selector, element = document.documentElement) {
+    if (typeof selector !== 'string') {
+      return null
+    }
+
+    return findOne.call(element, selector)
+  },
+
+  children(element, selector) {
+    if (typeof selector !== 'string') {
+      return null
+    }
+
+    const children = makeArray(element.children)
+
+    return children.filter(child => this.matches(child, selector))
+  },
+
+  parents(element, selector) {
+    if (typeof selector !== 'string') {
+      return null
+    }
+
+    const parents = []
+    let ancestor = element.parentNode
+
+    while (ancestor && ancestor.nodeType === Node.ELEMENT_NODE && ancestor.nodeType !== NODE_TEXT) {
+      if (this.matches(ancestor, selector)) {
+        parents.push(ancestor)
+      }
+
+      ancestor = ancestor.parentNode
+    }
+
+    return parents
+  },
+
+  closest(element, selector) {
+    if (typeof selector !== 'string') {
+      return null
+    }
+
+    return closest.call(element, selector)
+  },
+
+  prev(element, selector) {
+    if (typeof selector !== 'string') {
+      return null
+    }
+
+    const siblings = []
+    let previous = element.previousSibling
+
+    while (previous && previous.nodeType === Node.ELEMENT_NODE && previous.nodeType !== NODE_TEXT) {
+      if (this.matches(previous, selector)) {
+        siblings.push(previous)
+      }
+
+      previous = previous.previousSibling
+    }
+
+    return siblings
+  }
+}
+
+export default SelectorEngine