1 files changed, 101 insertions, 0 deletions
diff --git a/popperjs/package/lib/modifiers/arrow.js b/popperjs/package/lib/modifiers/arrow.js
new file mode 100644
index 0000000..d0001e2
--- /dev/null
+++ b/popperjs/package/lib/modifiers/arrow.js
@@ -0,0 +1,101 @@
+import getBasePlacement from "../utils/getBasePlacement.js";
+import getLayoutRect from "../dom-utils/getLayoutRect.js";
+import contains from "../dom-utils/contains.js";
+import getOffsetParent from "../dom-utils/getOffsetParent.js";
+import getMainAxisFromPlacement from "../utils/getMainAxisFromPlacement.js";
+import { within } from "../utils/within.js";
+import mergePaddingObject from "../utils/mergePaddingObject.js";
+import expandToHashMap from "../utils/expandToHashMap.js";
+import { left, right, basePlacements, top, bottom } from "../enums.js";
+import { isHTMLElement } from "../dom-utils/instanceOf.js"; // eslint-disable-next-line import/no-unused-modules
+
+var toPaddingObject = function toPaddingObject(padding, state) {
+  padding = typeof padding === 'function' ? padding(Object.assign({}, state.rects, {
+    placement: state.placement
+  })) : padding;
+  return mergePaddingObject(typeof padding !== 'number' ? padding : expandToHashMap(padding, basePlacements));
+};
+
+function arrow(_ref) {
+  var _state$modifiersData$;
+
+  var state = _ref.state,
+      name = _ref.name,
+      options = _ref.options;
+  var arrowElement = state.elements.arrow;
+  var popperOffsets = state.modifiersData.popperOffsets;
+  var basePlacement = getBasePlacement(state.placement);
+  var axis = getMainAxisFromPlacement(basePlacement);
+  var isVertical = [left, right].indexOf(basePlacement) >= 0;
+  var len = isVertical ? 'height' : 'width';
+
+  if (!arrowElement || !popperOffsets) {
+    return;
+  }
+
+  var paddingObject = toPaddingObject(options.padding, state);
+  var arrowRect = getLayoutRect(arrowElement);
+  var minProp = axis === 'y' ? top : left;
+  var maxProp = axis === 'y' ? bottom : right;
+  var endDiff = state.rects.reference[len] + state.rects.reference[axis] - popperOffsets[axis] - state.rects.popper[len];
+  var startDiff = popperOffsets[axis] - state.rects.reference[axis];
+  var arrowOffsetParent = getOffsetParent(arrowElement);
+  var clientSize = arrowOffsetParent ? axis === 'y' ? arrowOffsetParent.clientHeight || 0 : arrowOffsetParent.clientWidth || 0 : 0;
+  var centerToReference = endDiff / 2 - startDiff / 2; // Make sure the arrow doesn't overflow the popper if the center point is
+  // outside of the popper bounds
+
+  var min = paddingObject[minProp];
+  var max = clientSize - arrowRect[len] - paddingObject[maxProp];
+  var center = clientSize / 2 - arrowRect[len] / 2 + centerToReference;
+  var offset = within(min, center, max); // Prevents breaking syntax highlighting...
+
+  var axisProp = axis;
+  state.modifiersData[name] = (_state$modifiersData$ = {}, _state$modifiersData$[axisProp] = offset, _state$modifiersData$.centerOffset = offset - center, _state$modifiersData$);
+}
+
+function effect(_ref2) {
+  var state = _ref2.state,
+      options = _ref2.options;
+  var _options$element = options.element,
+      arrowElement = _options$element === void 0 ? '[data-popper-arrow]' : _options$element;
+
+  if (arrowElement == null) {
+    return;
+  } // CSS selector
+
+
+  if (typeof arrowElement === 'string') {
+    arrowElement = state.elements.popper.querySelector(arrowElement);
+
+    if (!arrowElement) {
+      return;
+    }
+  }
+
+  if (process.env.NODE_ENV !== "production") {
+    if (!isHTMLElement(arrowElement)) {
+      console.error(['Popper: "arrow" element must be an HTMLElement (not an SVGElement).', 'To use an SVG arrow, wrap it in an HTMLElement that will be used as', 'the arrow.'].join(' '));
+    }
+  }
+
+  if (!contains(state.elements.popper, arrowElement)) {
+    if (process.env.NODE_ENV !== "production") {
+      console.error(['Popper: "arrow" modifier\'s `element` must be a child of the popper', 'element.'].join(' '));
+    }
+
+    return;
+  }
+
+  state.elements.arrow = arrowElement;
+} // eslint-disable-next-line import/no-unused-modules
+
+
+export default {
+  name: 'arrow',
+  enabled: true,
+  phase: 'main',
+  fn: arrow,
+  effect: effect,
+  requires: ['popperOffsets'],
+  requiresIfExists: ['preventOverflow']
+};
+\ No newline at end of file