# all files / src/js/base/core/ range.js

74.76% Statements 237/317
70.53% Branches 134/190
86.67% Functions 39/45
74.76% Lines 237/317

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     import $ from 'jquery';
    import env from './env';
    import func from './func';
    import lists from './lists';
    import dom from './dom';

    /**
     * return boundaryPoint from TextRange, inspired by Andy Na's HuskyRange.js
     *
     * @param {TextRange} textRange
     * @param {Boolean} isStart
     * @return {BoundaryPoint}
     *
     * @see http://msdn.microsoft.com/en-us/library/ie/ms535872(v=vs.85).aspx
     */
    function textRangeToPoint(textRange, isStart) {
      let container = textRange.parentElement();
      let offset;

      const tester = document.body.createTextRange();
      let prevContainer;
      const childNodes = lists.from(container.childNodes);
      for (offset = 0; offset < childNodes.length; offset++) {
        if (dom.isText(childNodes[offset])) {
          continue;
        }
        tester.moveToElementText(childNodes[offset]);
        if (tester.compareEndPoints('StartToStart', textRange) >= 0) {
          break;
        }
        prevContainer = childNodes[offset];
      }

      if (offset !== 0 && dom.isText(childNodes[offset - 1])) {
        const textRangeStart = document.body.createTextRange();
        let curTextNode = null;
        textRangeStart.moveToElementText(prevContainer || container);
        textRangeStart.collapse(!prevContainer);
        curTextNode = prevContainer ? prevContainer.nextSibling : container.firstChild;

        const pointTester = textRange.duplicate();
        pointTester.setEndPoint('StartToStart', textRangeStart);
        let textCount = pointTester.text.replace(/[\r\n]/g, '').length;

        while (textCount > curTextNode.nodeValue.length && curTextNode.nextSibling) {
          textCount -= curTextNode.nodeValue.length;
          curTextNode = curTextNode.nextSibling;
        }

        // [workaround] enforce IE to re-reference curTextNode, hack
        const dummy = curTextNode.nodeValue; // eslint-disable-line

        if (isStart && curTextNode.nextSibling && dom.isText(curTextNode.nextSibling) &&
          textCount === curTextNode.nodeValue.length) {
          textCount -= curTextNode.nodeValue.length;
          curTextNode = curTextNode.nextSibling;
        }

        container = curTextNode;
        offset = textCount;
      }

      return {
        cont: container,
        offset: offset,
      };
    }

    /**
     * return TextRange from boundary point (inspired by google closure-library)
     * @param {BoundaryPoint} point
     * @return {TextRange}
     */
    function pointToTextRange(point) {
      const textRangeInfo = function(container, offset) {
        let node, isCollapseToStart;

        if (dom.isText(container)) {
          const prevTextNodes = dom.listPrev(container, func.not(dom.isText));
          const prevContainer = lists.last(prevTextNodes).previousSibling;
          node = prevContainer || container.parentNode;
          offset += lists.sum(lists.tail(prevTextNodes), dom.nodeLength);
          isCollapseToStart = !prevContainer;
        } else {
          node = container.childNodes[offset] || container;
          if (dom.isText(node)) {
            return textRangeInfo(node, 0);
          }

          offset = 0;
          isCollapseToStart = false;
        }

        return {
          node: node,
          collapseToStart: isCollapseToStart,
          offset: offset,
        };
      };

      const textRange = document.body.createTextRange();
      const info = textRangeInfo(point.node, point.offset);

      textRange.moveToElementText(info.node);
      textRange.collapse(info.collapseToStart);
      textRange.moveStart('character', info.offset);
      return textRange;
    }

    /**
       * Wrapped Range
       *
       * @constructor
       * @param {Node} sc - start container
       * @param {Number} so - start offset
       * @param {Node} ec - end container
       * @param {Number} eo - end offset
       */
    class WrappedRange {
      constructor(sc, so, ec, eo) {
        this.sc = sc;
        this.so = so;
        this.ec = ec;
        this.eo = eo;

        // isOnEditable: judge whether range is on editable or not
        this.isOnEditable = this.makeIsOn(dom.isEditable);
        // isOnList: judge whether range is on list node or not
        this.isOnList = this.makeIsOn(dom.isList);
        // isOnAnchor: judge whether range is on anchor node or not
        this.isOnAnchor = this.makeIsOn(dom.isAnchor);
        // isOnCell: judge whether range is on cell node or not
        this.isOnCell = this.makeIsOn(dom.isCell);
        // isOnData: judge whether range is on data node or not
        this.isOnData = this.makeIsOn(dom.isData);
      }

      // nativeRange: get nativeRange from sc, so, ec, eo
      nativeRange() {
        Eif (env.isW3CRangeSupport) {
          const w3cRange = document.createRange();
          w3cRange.setStart(this.sc, this.sc.data && this.so > this.sc.data.length ? 0 : this.so);
          w3cRange.setEnd(this.ec, this.sc.data ? Math.min(this.eo, this.sc.data.length) : this.eo);

          return w3cRange;
        } else {
          const textRange = pointToTextRange({
            node: this.sc,
            offset: this.so,
          });

          textRange.setEndPoint('EndToEnd', pointToTextRange({
            node: this.ec,
            offset: this.eo,
          }));

          return textRange;
        }
      }

      getPoints() {
        return {
          sc: this.sc,
          so: this.so,
          ec: this.ec,
          eo: this.eo,
        };
      }

      getStartPoint() {
        return {
          node: this.sc,
          offset: this.so,
        };
      }

      getEndPoint() {
        return {
          node: this.ec,
          offset: this.eo,
        };
      }

      /**
       * select update visible range
       */
      select() {
        const nativeRng = this.nativeRange();
        Eif (env.isW3CRangeSupport) {
          const selection = document.getSelection();
          if (selection.rangeCount > 0) {
            selection.removeAllRanges();
          }
          selection.addRange(nativeRng);
        } else {
          nativeRng.select();
        }

        return this;
      }

      /**
       * Moves the scrollbar to start container(sc) of current range
       *
       * @return {WrappedRange}
       */
      scrollIntoView(container) {
        const height = $(container).height();
        Iif (container.scrollTop + height < this.sc.offsetTop) {
          container.scrollTop += Math.abs(container.scrollTop + height - this.sc.offsetTop);
        }

        return this;
      }

      /**
       * @return {WrappedRange}
       */
      normalize() {
        /**
         * @param {BoundaryPoint} point
         * @param {Boolean} isLeftToRight - true: prefer to choose right node
         *                                - false: prefer to choose left node
         * @return {BoundaryPoint}
         */
        const getVisiblePoint = function(point, isLeftToRight) {
          // Just use the given point [XXX:Adhoc]
          //  - case 01. if the point is on the middle of the node
          //  - case 02. if the point is on the right edge and prefer to choose left node
          //  - case 03. if the point is on the left edge and prefer to choose right node
          //  - case 04. if the point is on the right edge and prefer to choose right node but the node is void
          //  - case 05. if the point is on the left edge and prefer to choose left node but the node is void
          //  - case 06. if the point is on the block node and there is no children
          if (dom.isVisiblePoint(point)) {
            if (!dom.isEdgePoint(point) ||
                (dom.isRightEdgePoint(point) && !isLeftToRight) ||
                (dom.isLeftEdgePoint(point) && isLeftToRight) ||
                (dom.isRightEdgePoint(point) && isLeftToRight && dom.isVoid(point.node.nextSibling)) ||
                (dom.isLeftEdgePoint(point) && !isLeftToRight && dom.isVoid(point.node.previousSibling)) ||
                (dom.isBlock(point.node) && dom.isEmpty(point.node))) {
              return point;
            }
          }

          // point on block's edge
          const block = dom.ancestor(point.node, dom.isBlock);
          if (((dom.isLeftEdgePointOf(point, block) || dom.isVoid(dom.prevPoint(point).node)) && !isLeftToRight) ||
            ((dom.isRightEdgePointOf(point, block) || dom.isVoid(dom.nextPoint(point).node)) && isLeftToRight)) {
            // returns point already on visible point
            if (dom.isVisiblePoint(point)) {
              return point;
            }
            // reverse direction
            isLeftToRight = !isLeftToRight;
          }

          const nextPoint = isLeftToRight ? dom.nextPointUntil(dom.nextPoint(point), dom.isVisiblePoint)
            : dom.prevPointUntil(dom.prevPoint(point), dom.isVisiblePoint);
          return nextPoint || point;
        };

        const endPoint = getVisiblePoint(this.getEndPoint(), false);
        const startPoint = this.isCollapsed() ? endPoint : getVisiblePoint(this.getStartPoint(), true);

        return new WrappedRange(
          startPoint.node,
          startPoint.offset,
          endPoint.node,
          endPoint.offset
        );
      }

      /**
       * returns matched nodes on range
       *
       * @param {Function} [pred] - predicate function
       * @param {Object} [options]
       * @param {Boolean} [options.includeAncestor]
       * @param {Boolean} [options.fullyContains]
       * @return {Node[]}
       */
      nodes(pred, options) {
        pred = pred || func.ok;

        const includeAncestor = options && options.includeAncestor;
        const fullyContains = options && options.fullyContains;

        // TODO compare points and sort
        const startPoint = this.getStartPoint();
        const endPoint = this.getEndPoint();

        const nodes = [];
        const leftEdgeNodes = [];

        dom.walkPoint(startPoint, endPoint, function(point) {
          if (dom.isEditable(point.node)) {
            return;
          }

          let node;
          if (fullyContains) {
            if (dom.isLeftEdgePoint(point)) {
              leftEdgeNodes.push(point.node);
            }
            if (dom.isRightEdgePoint(point) && lists.contains(leftEdgeNodes, point.node)) {
              node = point.node;
            }
          } else if (includeAncestor) {
            node = dom.ancestor(point.node, pred);
          } else {
            node = point.node;
          }

          if (node && pred(node)) {
            nodes.push(node);
          }
        }, true);

        return lists.unique(nodes);
      }

      /**
       * returns commonAncestor of range
       * @return {Element} - commonAncestor
       */
      commonAncestor() {
        return dom.commonAncestor(this.sc, this.ec);
      }

      /**
       * returns expanded range by pred
       *
       * @param {Function} pred - predicate function
       * @return {WrappedRange}
       */
      expand(pred) {
        const startAncestor = dom.ancestor(this.sc, pred);
        const endAncestor = dom.ancestor(this.ec, pred);

        Iif (!startAncestor && !endAncestor) {
          return new WrappedRange(this.sc, this.so, this.ec, this.eo);
        }

        const boundaryPoints = this.getPoints();

        Eif (startAncestor) {
          boundaryPoints.sc = startAncestor;
          boundaryPoints.so = 0;
        }

        Eif (endAncestor) {
          boundaryPoints.ec = endAncestor;
          boundaryPoints.eo = dom.nodeLength(endAncestor);
        }

        return new WrappedRange(
          boundaryPoints.sc,
          boundaryPoints.so,
          boundaryPoints.ec,
          boundaryPoints.eo
        );
      }

      /**
       * @param {Boolean} isCollapseToStart
       * @return {WrappedRange}
       */
      collapse(isCollapseToStart) {
        if (isCollapseToStart) {
          return new WrappedRange(this.sc, this.so, this.sc, this.so);
        } else {
          return new WrappedRange(this.ec, this.eo, this.ec, this.eo);
        }
      }

      /**
       * splitText on range
       */
      splitText() {
        const isSameContainer = this.sc === this.ec;
        const boundaryPoints = this.getPoints();

        if (dom.isText(this.ec) && !dom.isEdgePoint(this.getEndPoint())) {
          this.ec.splitText(this.eo);
        }

        if (dom.isText(this.sc) && !dom.isEdgePoint(this.getStartPoint())) {
          boundaryPoints.sc = this.sc.splitText(this.so);
          boundaryPoints.so = 0;

          if (isSameContainer) {
            boundaryPoints.ec = boundaryPoints.sc;
            boundaryPoints.eo = this.eo - this.so;
          }
        }

        return new WrappedRange(
          boundaryPoints.sc,
          boundaryPoints.so,
          boundaryPoints.ec,
          boundaryPoints.eo
        );
      }

      /**
       * delete contents on range
       * @return {WrappedRange}
       */
      deleteContents() {
        if (this.isCollapsed()) {
          return this;
        }

        const rng = this.splitText();
        const nodes = rng.nodes(null, {
          fullyContains: true,
        });

        // find new cursor point
        const point = dom.prevPointUntil(rng.getStartPoint(), function(point) {
          return !lists.contains(nodes, point.node);
        });

        const emptyParents = [];
        $.each(nodes, function(idx, node) {
          // find empty parents
          const parent = node.parentNode;
          if (point.node !== parent && dom.nodeLength(parent) === 1) {
            emptyParents.push(parent);
          }
          dom.remove(node, false);
        });

        // remove empty parents
        $.each(emptyParents, function(idx, node) {
          dom.remove(node, false);
        });

        return new WrappedRange(
          point.node,
          point.offset,
          point.node,
          point.offset
        ).normalize();
      }

      /**
       * makeIsOn: return isOn(pred) function
       */
      makeIsOn(pred) {
        return function() {
          const ancestor = dom.ancestor(this.sc, pred);
          return !!ancestor && (ancestor === dom.ancestor(this.ec, pred));
        };
      }

      /**
       * @param {Function} pred
       * @return {Boolean}
       */
      isLeftEdgeOf(pred) {
        if (!dom.isLeftEdgePoint(this.getStartPoint())) {
          return false;
        }

        const node = dom.ancestor(this.sc, pred);
        return node && dom.isLeftEdgeOf(this.sc, node);
      }

      /**
       * returns whether range was collapsed or not
       */
      isCollapsed() {
        return this.sc === this.ec && this.so === this.eo;
      }

      /**
       * wrap inline nodes which children of body with paragraph
       *
       * @return {WrappedRange}
       */
      wrapBodyInlineWithPara() {
        if (dom.isBodyContainer(this.sc) && dom.isEmpty(this.sc)) {
          this.sc.innerHTML = dom.emptyPara;
          return new WrappedRange(this.sc.firstChild, 0, this.sc.firstChild, 0);
        }

        /**
         * [workaround] firefox often create range on not visible point. so normalize here.
         *  - firefox: |<p>text</p>|
         *  - chrome: <p>|text|</p>
         */
        const rng = this.normalize();
        if (dom.isParaInline(this.sc) || dom.isPara(this.sc)) {
          return rng;
        }

        // find inline top ancestor
        let topAncestor;
        if (dom.isInline(rng.sc)) {
          const ancestors = dom.listAncestor(rng.sc, func.not(dom.isInline));
          topAncestor = lists.last(ancestors);
          if (!dom.isInline(topAncestor)) {
            topAncestor = ancestors[ancestors.length - 2] || rng.sc.childNodes[rng.so];
          }
        } else {
          topAncestor = rng.sc.childNodes[rng.so > 0 ? rng.so - 1 : 0];
        }

        // siblings not in paragraph
        let inlineSiblings = dom.listPrev(topAncestor, dom.isParaInline).reverse();
        inlineSiblings = inlineSiblings.concat(dom.listNext(topAncestor.nextSibling, dom.isParaInline));

        // wrap with paragraph
        if (inlineSiblings.length) {
          const para = dom.wrap(lists.head(inlineSiblings), 'p');
          dom.appendChildNodes(para, lists.tail(inlineSiblings));
        }

        return this.normalize();
      }

      /**
       * insert node at current cursor
       *
       * @param {Node} node
       * @return {Node}
       */
      insertNode(node) {
        const rng = this.wrapBodyInlineWithPara().deleteContents();
        const info = dom.splitPoint(rng.getStartPoint(), dom.isInline(node));

        if (info.rightNode) {
          info.rightNode.parentNode.insertBefore(node, info.rightNode);
        } else {
          info.container.appendChild(node);
        }

        return node;
      }

      /**
       * insert html at current cursor
       */
      pasteHTML(markup) {
        const contentsContainer = $('<div></div>').html(markup)[0];
        let childNodes = lists.from(contentsContainer.childNodes);
        const rng = this.wrapBodyInlineWithPara().deleteContents();

        Eif (rng.so > 0) {
          childNodes = childNodes.reverse();
        }
        childNodes = childNodes.map(function(childNode) {
          return rng.insertNode(childNode);
        });
        Eif (rng.so > 0) {
          childNodes = childNodes.reverse();
        }
        return childNodes;
      }

      /**
       * returns text in range
       *
       * @return {String}
       */
      toString() {
        const nativeRng = this.nativeRange();
        return env.isW3CRangeSupport ? nativeRng.toString() : nativeRng.text;
      }

      /**
       * returns range for word before cursor
       *
       * @param {Boolean} [findAfter] - find after cursor, default: false
       * @return {WrappedRange}
       */
      getWordRange(findAfter) {
        let endPoint = this.getEndPoint();

        if (!dom.isCharPoint(endPoint)) {
          return this;
        }

        const startPoint = dom.prevPointUntil(endPoint, function(point) {
          return !dom.isCharPoint(point);
        });

        Iif (findAfter) {
          endPoint = dom.nextPointUntil(endPoint, function(point) {
            return !dom.isCharPoint(point);
          });
        }

        return new WrappedRange(
          startPoint.node,
          startPoint.offset,
          endPoint.node,
          endPoint.offset
        );
      }

      /**
       * create offsetPath bookmark
       *
       * @param {Node} editable
       */
      bookmark(editable) {
        return {
          s: {
            path: dom.makeOffsetPath(editable, this.sc),
            offset: this.so,
          },
          e: {
            path: dom.makeOffsetPath(editable, this.ec),
            offset: this.eo,
          },
        };
      }

      /**
       * create offsetPath bookmark base on paragraph
       *
       * @param {Node[]} paras
       */
      paraBookmark(paras) {
        return {
          s: {
            path: lists.tail(dom.makeOffsetPath(lists.head(paras), this.sc)),
            offset: this.so,
          },
          e: {
            path: lists.tail(dom.makeOffsetPath(lists.last(paras), this.ec)),
            offset: this.eo,
          },
        };
      }

      /**
       * getClientRects
       * @return {Rect[]}
       */
      getClientRects() {
        const nativeRng = this.nativeRange();
        return nativeRng.getClientRects();
      }
    }

    /**
     * Data structure
     *  * BoundaryPoint: a point of dom tree
     *  * BoundaryPoints: two boundaryPoints corresponding to the start and the end of the Range
     *
     * See to http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level-2-Range-Position
     */
    export default {
      /**
       * create Range Object From arguments or Browser Selection
       *
       * @param {Node} sc - start container
       * @param {Number} so - start offset
       * @param {Node} ec - end container
       * @param {Number} eo - end offset
       * @return {WrappedRange}
       */
      create: function(sc, so, ec, eo) {
        if (arguments.length === 4) {
          return new WrappedRange(sc, so, ec, eo);
        } else if (arguments.length === 2) { // collapsed
          ec = sc;
          eo = so;
          return new WrappedRange(sc, so, ec, eo);
        } else {
          let wrappedRange = this.createFromSelection();
          if (!wrappedRange && arguments.length === 1) {
            wrappedRange = this.createFromNode(arguments[0]);
            return wrappedRange.collapse(dom.emptyPara === arguments[0].innerHTML);
          }
          return wrappedRange;
        }
      },

      createFromSelection: function() {
        let sc, so, ec, eo;
        Eif (env.isW3CRangeSupport) {
          const selection = document.getSelection();
          if (!selection || selection.rangeCount === 0) {
            return null;
          } else if (dom.isBody(selection.anchorNode)) {
            // Firefox: returns entire body as range on initialization.
            // We won't never need it.
            return null;
          }

          const nativeRng = selection.getRangeAt(0);
          sc = nativeRng.startContainer;
          so = nativeRng.startOffset;
          ec = nativeRng.endContainer;
          eo = nativeRng.endOffset;
        } else { // IE8: TextRange
          const textRange = document.selection.createRange();
          const textRangeEnd = textRange.duplicate();
          textRangeEnd.collapse(false);
          const textRangeStart = textRange;
          textRangeStart.collapse(true);

          let startPoint = textRangeToPoint(textRangeStart, true);
          let endPoint = textRangeToPoint(textRangeEnd, false);

          // same visible point case: range was collapsed.
          if (dom.isText(startPoint.node) && dom.isLeftEdgePoint(startPoint) &&
            dom.isTextNode(endPoint.node) && dom.isRightEdgePoint(endPoint) &&
            endPoint.node.nextSibling === startPoint.node) {
            startPoint = endPoint;
          }

          sc = startPoint.cont;
          so = startPoint.offset;
          ec = endPoint.cont;
          eo = endPoint.offset;
        }

        return new WrappedRange(sc, so, ec, eo);
      },

      /**
       * @method
       *
       * create WrappedRange from node
       *
       * @param {Node} node
       * @return {WrappedRange}
       */
      createFromNode: function(node) {
        let sc = node;
        let so = 0;
        let ec = node;
        let eo = dom.nodeLength(ec);

        // browsers can't target a picture or void node
        if (dom.isVoid(sc)) {
          so = dom.listPrev(sc).length - 1;
          sc = sc.parentNode;
        }
        Iif (dom.isBR(ec)) {
          eo = dom.listPrev(ec).length - 1;
          ec = ec.parentNode;
        } else if (dom.isVoid(ec)) {
          eo = dom.listPrev(ec).length;
          ec = ec.parentNode;
        }

        return this.create(sc, so, ec, eo);
      },

      /**
       * create WrappedRange from node after position
       *
       * @param {Node} node
       * @return {WrappedRange}
       */
      createFromNodeBefore: function(node) {
        return this.createFromNode(node).collapse(true);
      },

      /**
       * create WrappedRange from node after position
       *
       * @param {Node} node
       * @return {WrappedRange}
       */
      createFromNodeAfter: function(node) {
        return this.createFromNode(node).collapse();
      },

      /**
       * @method
       *
       * create WrappedRange from bookmark
       *
       * @param {Node} editable
       * @param {Object} bookmark
       * @return {WrappedRange}
       */
      createFromBookmark: function(editable, bookmark) {
        const sc = dom.fromOffsetPath(editable, bookmark.s.path);
        const so = bookmark.s.offset;
        const ec = dom.fromOffsetPath(editable, bookmark.e.path);
        const eo = bookmark.e.offset;
        return new WrappedRange(sc, so, ec, eo);
      },

      /**
       * @method
       *
       * create WrappedRange from paraBookmark
       *
       * @param {Object} bookmark
       * @param {Node[]} paras
       * @return {WrappedRange}
       */
      createFromParaBookmark: function(bookmark, paras) {
        const so = bookmark.s.offset;
        const eo = bookmark.e.offset;
        const sc = dom.fromOffsetPath(lists.head(paras), bookmark.s.path);
        const ec = dom.fromOffsetPath(lists.last(paras), bookmark.e.path);

        return new WrappedRange(sc, so, ec, eo);
      },
    };