dist/vue-draggable-nested-tree.es.js
function autoMoveDragPlaceHolder(draggableHelperInfo) {
  var trees = this.store.trees;
  var dhStore = draggableHelperInfo.store; // make info

  var info = {
    event: draggableHelperInfo.event,
    el: dhStore.el,
    vm: this,
    node: this.data,
    store: this.store,
    dplh: this.store.dplh,
    draggableHelperData: {
      opt: draggableHelperInfo.options,
      store: dhStore
    } //

  };
  attachCache(info, new Cache(), {
    // dragging node coordinate
    // 拖动中的节点相关坐标
    nodeInnerEl: function nodeInnerEl() {
      return this.el.querySelector('.tree-node-inner');
    },
    offset: function offset() {
      return getOffset(this.nodeInnerEl);
    },
    // left top point
    offset2: function offset2() {
      return {
        x: this.offset.x + this.nodeInnerEl.offsetWidth,
        y: this.offset.y + this.nodeInnerEl.offsetHeight
      };
    },
    // right bottom point
    offsetToViewPort: function offsetToViewPort() {
      var r = this.nodeInnerEl.getBoundingClientRect();
      r.x = r.left;
      r.y = r.top;
      return r;
    },
    // tree
    currentTree: function currentTree() {
      // const currentTree = trees.find(tree => hp.isOffsetInEl(this.offset.x, this.offset.y, tree.$el))
      var currentTree = getTreeByPoint(this.offsetToViewPort.x, this.offsetToViewPort.y, trees);

      if (currentTree) {
        var dragStartTree = this.store;

        if (prevTree == null) {
          prevTree = dragStartTree;
        }

        if (prevTree !== currentTree) {
          if (!isPropTrue(dragStartTree.crossTree) || !isPropTrue(currentTree.crossTree)) {
            return;
          }

          prevTree = currentTree;
        }

        if (!isPropTrue(currentTree.droppable)) {
          return;
        }

        return currentTree;
      }
    },
    currentTreeRootEl: function currentTreeRootEl() {
      return document.getElementById(this.currentTree.rootData._id);
    },
    currentTreeRootOf4: function currentTreeRootOf4() {
      return getOf4(this.currentTreeRootEl, this.currentTree.space);
    },
    // the second child of currentTree root, excluding dragging node
    currentTreeRootSecondChildExcludingDragging: function currentTreeRootSecondChildExcludingDragging() {
      var _this = this;

      return this.currentTree.rootData.children.slice(0, 3).filter(function (v) {
        return v !== _this.node;
      })[1];
    },
    // placeholder
    dplhEl: function dplhEl() {
      return document.getElementById(this.dplh._id);
    },
    dplhElInCurrentTree: function dplhElInCurrentTree() {
      return Boolean(this.currentTree.$el.querySelector("#".concat(this.dplh._id)));
    },
    dplhOf4: function dplhOf4() {
      return getOf4(this.dplhEl, this.currentTree.space);
    },
    dplhAtTop: function dplhAtTop() {
      return Math.abs(this.dplhOf4.y - this.currentTreeRootOf4.y) < 5;
    },
    targetAtTop: function targetAtTop() {
      return Math.abs(this.tiOf4.y - this.currentTreeRootOf4.y) < 5;
    },
    targetAtBottom: function targetAtBottom() {
      return Math.abs(this.tiOf4.y2 - this.currentTreeRootOf4.y2) < 5;
    },
    // most related node
    // 最相关的另一个节点
    targetNode: function targetNode() {
      var currentTree = this.currentTree;

      if (!currentTree) {
        throw 'no currentTree';
      } //


      var _this$offset = this.offset,
          x = _this$offset.x,
          y = _this$offset.y;
      var currentNode = currentTree.rootData;

      while (true) {
        var children = currentNode.children;

        if (!children) {
          break;
        }

        if (this.node.parent === currentNode) {
          // dragging node is in currentNode children, remove it first
          children = children.slice();
          children.splice(children.indexOf(this.node), 1);
        }

        if (children.length === 0) {
          break;
        }

        var t = binarySearch(children, function (node) {
          var el = document.getElementById(node._id);
          var ty = getOffset(el).y;
          var ty2 = ty + el.offsetHeight + currentTree.space;

          if (ty2 < y) {
            return -1;
          } else if (ty <= y) {
            return 0;
          } else {
            return 1;
          }
        }, null, null, true);

        if (t.hit) {
          currentNode = t.value;
        } else {
          if (t.bigger) {
            currentNode = children[t.index - 1];
          } else {
            currentNode = t.value;
          }
        }

        if (!currentNode) {
          currentNode = children[0];
          break;
        }

        if (!currentNode) {
          break;
        }

        var innerEl = document.getElementById(currentNode._id).querySelector('.tree-node-inner');
        var of = getOf4(innerEl, currentTree.space);

        if (of.y <= y && y <= of.y2) {
          break;
        }
      }

      return currentNode;
    },
    targetNodeEl: function targetNodeEl() {
      return document.getElementById(this.targetNode._id);
    },
    // targetNodeInnerElOffset
    tiInnerEl: function tiInnerEl() {
      return this.targetNodeEl.querySelector('.tree-node-inner');
    },
    tiOffset: function tiOffset() {
      return getOffset(this.tiInnerEl);
    },
    tiOf4: function tiOf4() {
      return getOf4(this.tiInnerEl, this.currentTree.space);
    },
    tiMiddleY: function tiMiddleY() {
      return this.tiOffset.y + this.tiInnerEl.offsetHeight / 2;
    },
    //
    targetPrevEl: function targetPrevEl() {
      // tree node 之间不要有其他元素, 否则这里会获取到错误的元素
      var r = this.targetNodeEl.previousSibling;

      if (hasClass(r, 'dragging')) {
        r = r.previousSibling;
      }

      return r;
    },
    targetPrev: function targetPrev() {
      var id = this.targetPrevEl.getAttribute('id');
      return this.currentTree.getNodeById(id);
    }
  }); // attachCache end
  // decision start =================================

  var executedRuleCache = {}; // exec rule

  var exec = function exec(ruleId) {
    if (!executedRuleCache.hasOwnProperty(ruleId)) {
      var r;

      try {
        r = rules[ruleId](info);
      } catch (e) {
        r = e;

        try {
          if (process.env.DEVELOPE_SELF) {
            // only visible when develop its self
            console.warn("failed to execute rule '".concat(ruleId, "'"), e);
          }
        } catch (e2) {}
      }

      executedRuleCache[ruleId] = r;
    }

    return executedRuleCache[ruleId];
  };

  if (exec('currentTree existed') === true) {
    if (exec('targetNode is placeholder') === false) {
      if (exec('targetNode is the second child of root') === true) {
        if (exec('targetNode has children excluding placeholder') === false) {
          if (exec('on targetNode middle') === true) {
            targets['before'](info);
          } else if (exec('on targetNode middle') === false) {
            if (exec('at indent right') === true) {
              targets['append'](info);
            } else if (exec('at indent right') === false) {
              targets['after'](info);
            }
          }
        } else if (exec('targetNode has children excluding placeholder') === true) {
          targets['prepend'](info);
        }
      } else if (exec('targetNode is the second child of root') === false) {
        if (exec('currentTree empty') === false) {
          if (exec('targetNode at top') === true) {
            if (exec('placeholder in currentTree') === true) {
              if (exec('targetNode has children excluding placeholder') === false) {
                if (exec('on targetNode middle') === false) {
                  if (exec('at indent right') === false) {
                    targets['after'](info);
                  } else if (exec('at indent right') === true) {
                    targets['append'](info);
                  }
                } else if (exec('on targetNode middle') === true) {
                  targets['before'](info);
                }
              } else if (exec('targetNode has children excluding placeholder') === true) {
                if (exec('on targetNode middle') === false) {
                  targets['prepend'](info);
                } else if (exec('on targetNode middle') === true) {
                  targets['before'](info);
                }
              }
            } else if (exec('placeholder in currentTree') === false) {
              targets['before'](info);
            }
          } else if (exec('targetNode at top') === false) {
            if (exec('targetNode at bottom') === false) {
              if (exec('placeholder at top') === true) {
                targets['prepend'](info);
              } else if (exec('placeholder at top') === false) {
                if (exec('targetNode has children excluding placeholder') === true) {
                  targets['prepend'](info);
                } else if (exec('targetNode has children excluding placeholder') === false) {
                  if (exec('targetNode is 1st child') === false) {
                    if (exec('targetNode is last child') === false) {
                      if (exec('on targetNode middle') === true) {
                        if (exec('at indent right') === true) {
                          targets['append'](info);
                        } else if (exec('at indent right') === false) {
                          targets['after'](info);
                        }
                      } else if (exec('on targetNode middle') === false) {
                        if (exec('at indent right') === true) {
                          targets['append'](info);
                        } else if (exec('at indent right') === false) {
                          targets['after'](info);
                        }
                      }
                    } else if (exec('targetNode is last child') === true) {
                      if (exec('at indent right') === true) {
                        targets['append'](info);
                      } else if (exec('at indent right') === false) {
                        targets['after'](info);
                      }
                    }
                  } else if (exec('targetNode is 1st child') === true) {
                    if (exec('targetNode is last child') === true) {
                      targets['append'](info);
                    } else if (exec('targetNode is last child') === false) {
                      if (exec('on targetNode middle') === false) {
                        if (exec('at indent right') === false) {
                          targets['after'](info);
                        } else if (exec('at indent right') === true) {
                          targets['append'](info);
                        }
                      } else if (exec('on targetNode middle') === true) {
                        if (exec('at indent right') === false) {
                          targets['after'](info);
                        } else if (exec('at indent right') === true) {
                          targets['append'](info);
                        }
                      }
                    }
                  }
                }
              }
            } else if (exec('targetNode at bottom') === true) {
              if (exec('placeholder in currentTree') === true) {
                if (exec('on targetNode middle') === false) {
                  if (exec('at indent right') === true) {
                    targets['append'](info);
                  } else if (exec('at indent right') === false) {
                    targets['after'](info);
                  }
                } else if (exec('on targetNode middle') === true) {
                  targets['append'](info);
                }
              } else if (exec('placeholder in currentTree') === false) {
                targets['append'](info);
              }
            }
          }
        } else if (exec('currentTree empty') === true) {
          targets['append current tree'](info);
        }
      }
    } else if (exec('targetNode is placeholder') === true) {
      if (exec('targetNode at bottom') === false) {
        if (exec('targetNode is the second child of root') === false) {
          if (exec('targetNode is 1st child') === true) {
            if (exec('targetNode is last child') === false) ; else if (exec('targetNode is last child') === true) {
              if (exec('on targetNode middle') === false) {
                if (exec('at left') === true) {
                  targets['after target parent'](info);
                } else if (exec('at left') === false) ;
              } else if (exec('on targetNode middle') === true) {
                if (exec('at left') === true) {
                  targets['after target parent'](info);
                } else if (exec('at left') === false) ;
              }
            }
          } else if (exec('targetNode is 1st child') === false) {
            if (exec('targetNode is last child') === true) {
              if (exec('on targetNode middle') === true) {
                if (exec('at left') === true) {
                  targets['after target parent'](info);
                } else if (exec('at left') === false) {
                  if (exec('at indent right') === true) {
                    targets['append prev'](info);
                  } else if (exec('at indent right') === false) ;
                }
              } else if (exec('on targetNode middle') === false) {
                if (exec('at left') === true) {
                  targets['after target parent'](info);
                } else if (exec('at left') === false) {
                  if (exec('at indent right') === true) {
                    targets['append prev'](info);
                  } else if (exec('at indent right') === false) ;
                }
              }
            } else if (exec('targetNode is last child') === false) {
              if (exec('on targetNode middle') === true) {
                if (exec('at left') === true) ; else if (exec('at left') === false) {
                  if (exec('at indent right') === true) {
                    targets['append prev'](info);
                  } else if (exec('at indent right') === false) ;
                }
              } else if (exec('on targetNode middle') === false) {
                if (exec('at left') === true) ; else if (exec('at left') === false) {
                  if (exec('at indent right') === true) {
                    targets['append prev'](info);
                  } else if (exec('at indent right') === false) ;
                }
              }
            }
          }
        } else if (exec('targetNode is the second child of root') === true) {
          if (exec('on targetNode middle') === true) {
            if (exec('at indent right') === true) {
              targets['append prev'](info);
            } else if (exec('at indent right') === false) ;
          } else if (exec('on targetNode middle') === false) {
            if (exec('at indent right') === true) {
              targets['append prev'](info);
            } else if (exec('at indent right') === false) ;
          }
        }
      } else if (exec('targetNode at bottom') === true) {
        if (exec('targetNode is 1st child') === true) {
          if (exec('on targetNode middle') === false) {
            if (exec('at left') === true) {
              targets['after target parent'](info);
            } else if (exec('at left') === false) ;
          } else if (exec('on targetNode middle') === true) {
            if (exec('at left') === false) ; else if (exec('at left') === true) {
              targets['after target parent'](info);
            }
          }
        } else if (exec('targetNode is 1st child') === false) {
          if (exec('on targetNode middle') === false) {
            if (exec('at left') === true) {
              targets['after target parent'](info);
            } else if (exec('at left') === false) {
              if (exec('at indent right') === true) {
                targets['append prev'](info);
              } else if (exec('at indent right') === false) ;
            }
          } else if (exec('on targetNode middle') === true) {
            if (exec('at left') === true) {
              targets['after target parent'](info);
            } else if (exec('at left') === false) {
              if (exec('at indent right') === true) {
                targets['append prev'](info);
              } else if (exec('at indent right') === false) ;
            }
          }
        }
      }
    }
  } else if (exec('currentTree existed') === false) ; // decision end =================================
  //

}
function autoMoveDragPlaceHolder(draggableHelperInfo) {
  var trees = this.store.trees;
  var dhStore = draggableHelperInfo.store; // make info

  var info = {
    event: draggableHelperInfo.event,
    el: dhStore.el,
    vm: this,
    node: this.data,
    store: this.store,
    dplh: this.store.dplh,
    draggableHelperData: {
      opt: draggableHelperInfo.options,
      store: dhStore
    } //

  };
  attachCache(info, new Cache(), {
    // dragging node coordinate
    // 拖动中的节点相关坐标
    nodeInnerEl: function nodeInnerEl() {
      return this.el.querySelector('.tree-node-inner');
    },
    offset: function offset() {
      return getOffset(this.nodeInnerEl);
    },
    // left top point
    offset2: function offset2() {
      return {
        x: this.offset.x + this.nodeInnerEl.offsetWidth,
        y: this.offset.y + this.nodeInnerEl.offsetHeight
      };
    },
    // right bottom point
    offsetToViewPort: function offsetToViewPort() {
      var r = this.nodeInnerEl.getBoundingClientRect();
      r.x = r.left;
      r.y = r.top;
      return r;
    },
    // tree
    currentTree: function currentTree() {
      // const currentTree = trees.find(tree => hp.isOffsetInEl(this.offset.x, this.offset.y, tree.$el))
      var currentTree = getTreeByPoint(this.offsetToViewPort.x, this.offsetToViewPort.y, trees);

      if (currentTree) {
        var dragStartTree = this.store;

        if (prevTree == null) {
          prevTree = dragStartTree;
        }

        if (prevTree !== currentTree) {
          if (!isPropTrue(dragStartTree.crossTree) || !isPropTrue(currentTree.crossTree)) {
            return;
          }

          prevTree = currentTree;
        }

        if (!isPropTrue(currentTree.droppable)) {
          return;
        }

        return currentTree;
      }
    },
    currentTreeRootEl: function currentTreeRootEl() {
      return document.getElementById(this.currentTree.rootData._id);
    },
    currentTreeRootOf4: function currentTreeRootOf4() {
      return getOf4(this.currentTreeRootEl, this.currentTree.space);
    },
    // the second child of currentTree root, excluding dragging node
    currentTreeRootSecondChildExcludingDragging: function currentTreeRootSecondChildExcludingDragging() {
      var _this = this;

      return this.currentTree.rootData.children.slice(0, 3).filter(function (v) {
        return v !== _this.node;
      })[1];
    },
    // placeholder
    dplhEl: function dplhEl() {
      return document.getElementById(this.dplh._id);
    },
    dplhElInCurrentTree: function dplhElInCurrentTree() {
      return Boolean(this.currentTree.$el.querySelector("#".concat(this.dplh._id)));
    },
    dplhOf4: function dplhOf4() {
      return getOf4(this.dplhEl, this.currentTree.space);
    },
    dplhAtTop: function dplhAtTop() {
      return Math.abs(this.dplhOf4.y - this.currentTreeRootOf4.y) < 5;
    },
    targetAtTop: function targetAtTop() {
      return Math.abs(this.tiOf4.y - this.currentTreeRootOf4.y) < 5;
    },
    targetAtBottom: function targetAtBottom() {
      return Math.abs(this.tiOf4.y2 - this.currentTreeRootOf4.y2) < 5;
    },
    // most related node
    // 最相关的另一个节点
    targetNode: function targetNode() {
      var currentTree = this.currentTree;

      if (!currentTree) {
        throw 'no currentTree';
      } //


      var _this$offset = this.offset,
          x = _this$offset.x,
          y = _this$offset.y;
      var currentNode = currentTree.rootData;

      while (true) {
        var children = currentNode.children;

        if (!children) {
          break;
        }

        if (this.node.parent === currentNode) {
          // dragging node is in currentNode children, remove it first
          children = children.slice();
          children.splice(children.indexOf(this.node), 1);
        }

        if (children.length === 0) {
          break;
        }

        var t = binarySearch(children, function (node) {
          var el = document.getElementById(node._id);
          var ty = getOffset(el).y;
          var ty2 = ty + el.offsetHeight + currentTree.space;

          if (ty2 < y) {
            return -1;
          } else if (ty <= y) {
            return 0;
          } else {
            return 1;
          }
        }, null, null, true);

        if (t.hit) {
          currentNode = t.value;
        } else {
          if (t.bigger) {
            currentNode = children[t.index - 1];
          } else {
            currentNode = t.value;
          }
        }

        if (!currentNode) {
          currentNode = children[0];
          break;
        }

        if (!currentNode) {
          break;
        }

        var innerEl = document.getElementById(currentNode._id).querySelector('.tree-node-inner');
        var of = getOf4(innerEl, currentTree.space);

        if (of.y <= y && y <= of.y2) {
          break;
        }
      }

      return currentNode;
    },
    targetNodeEl: function targetNodeEl() {
      return document.getElementById(this.targetNode._id);
    },
    // targetNodeInnerElOffset
    tiInnerEl: function tiInnerEl() {
      return this.targetNodeEl.querySelector('.tree-node-inner');
    },
    tiOffset: function tiOffset() {
      return getOffset(this.tiInnerEl);
    },
    tiOf4: function tiOf4() {
      return getOf4(this.tiInnerEl, this.currentTree.space);
    },
    tiMiddleY: function tiMiddleY() {
      return this.tiOffset.y + this.tiInnerEl.offsetHeight / 2;
    },
    //
    targetPrevEl: function targetPrevEl() {
      // tree node 之间不要有其他元素, 否则这里会获取到错误的元素
      var r = this.targetNodeEl.previousSibling;

      if (hasClass(r, 'dragging')) {
        r = r.previousSibling;
      }

      return r;
    },
    targetPrev: function targetPrev() {
      var id = this.targetPrevEl.getAttribute('id');
      return this.currentTree.getNodeById(id);
    }
  }); // attachCache end
  // decision start =================================

  var executedRuleCache = {}; // exec rule

  var exec = function exec(ruleId) {
    if (!executedRuleCache.hasOwnProperty(ruleId)) {
      var r;

      try {
        r = rules[ruleId](info);
      } catch (e) {
        r = e;

        try {
          if (process.env.DEVELOPE_SELF) {
            // only visible when develop its self
            console.warn("failed to execute rule '".concat(ruleId, "'"), e);
          }
        } catch (e2) {}
      }

      executedRuleCache[ruleId] = r;
    }

    return executedRuleCache[ruleId];
  };

  if (exec('currentTree existed') === true) {
    if (exec('targetNode is placeholder') === false) {
      if (exec('targetNode is the second child of root') === true) {
        if (exec('targetNode has children excluding placeholder') === false) {
          if (exec('on targetNode middle') === true) {
            targets['before'](info);
          } else if (exec('on targetNode middle') === false) {
            if (exec('at indent right') === true) {
              targets['append'](info);
            } else if (exec('at indent right') === false) {
              targets['after'](info);
            }
          }
        } else if (exec('targetNode has children excluding placeholder') === true) {
          targets['prepend'](info);
        }
      } else if (exec('targetNode is the second child of root') === false) {
        if (exec('currentTree empty') === false) {
          if (exec('targetNode at top') === true) {
            if (exec('placeholder in currentTree') === true) {
              if (exec('targetNode has children excluding placeholder') === false) {
                if (exec('on targetNode middle') === false) {
                  if (exec('at indent right') === false) {
                    targets['after'](info);
                  } else if (exec('at indent right') === true) {
                    targets['append'](info);
                  }
                } else if (exec('on targetNode middle') === true) {
                  targets['before'](info);
                }
              } else if (exec('targetNode has children excluding placeholder') === true) {
                if (exec('on targetNode middle') === false) {
                  targets['prepend'](info);
                } else if (exec('on targetNode middle') === true) {
                  targets['before'](info);
                }
              }
            } else if (exec('placeholder in currentTree') === false) {
              targets['before'](info);
            }
          } else if (exec('targetNode at top') === false) {
            if (exec('targetNode at bottom') === false) {
              if (exec('placeholder at top') === true) {
                targets['prepend'](info);
              } else if (exec('placeholder at top') === false) {
                if (exec('targetNode has children excluding placeholder') === true) {
                  targets['prepend'](info);
                } else if (exec('targetNode has children excluding placeholder') === false) {
                  if (exec('targetNode is 1st child') === false) {
                    if (exec('targetNode is last child') === false) {
                      if (exec('on targetNode middle') === true) {
                        if (exec('at indent right') === true) {
                          targets['append'](info);
                        } else if (exec('at indent right') === false) {
                          targets['after'](info);
                        }
                      } else if (exec('on targetNode middle') === false) {
                        if (exec('at indent right') === true) {
                          targets['append'](info);
                        } else if (exec('at indent right') === false) {
                          targets['after'](info);
                        }
                      }
                    } else if (exec('targetNode is last child') === true) {
                      if (exec('at indent right') === true) {
                        targets['append'](info);
                      } else if (exec('at indent right') === false) {
                        targets['after'](info);
                      }
                    }
                  } else if (exec('targetNode is 1st child') === true) {
                    if (exec('targetNode is last child') === true) {
                      targets['append'](info);
                    } else if (exec('targetNode is last child') === false) {
                      if (exec('on targetNode middle') === false) {
                        if (exec('at indent right') === false) {
                          targets['after'](info);
                        } else if (exec('at indent right') === true) {
                          targets['append'](info);
                        }
                      } else if (exec('on targetNode middle') === true) {
                        if (exec('at indent right') === false) {
                          targets['after'](info);
                        } else if (exec('at indent right') === true) {
                          targets['append'](info);
                        }
                      }
                    }
                  }
                }
              }
            } else if (exec('targetNode at bottom') === true) {
              if (exec('placeholder in currentTree') === true) {
                if (exec('on targetNode middle') === false) {
                  if (exec('at indent right') === true) {
                    targets['append'](info);
                  } else if (exec('at indent right') === false) {
                    targets['after'](info);
                  }
                } else if (exec('on targetNode middle') === true) {
                  targets['append'](info);
                }
              } else if (exec('placeholder in currentTree') === false) {
                targets['append'](info);
              }
            }
          }
        } else if (exec('currentTree empty') === true) {
          targets['append current tree'](info);
        }
      }
    } else if (exec('targetNode is placeholder') === true) {
      if (exec('targetNode at bottom') === false) {
        if (exec('targetNode is the second child of root') === false) {
          if (exec('targetNode is 1st child') === true) {
            if (exec('targetNode is last child') === false) ; else if (exec('targetNode is last child') === true) {
              if (exec('on targetNode middle') === false) {
                if (exec('at left') === true) {
                  targets['after target parent'](info);
                } else if (exec('at left') === false) ;
              } else if (exec('on targetNode middle') === true) {
                if (exec('at left') === true) {
                  targets['after target parent'](info);
                } else if (exec('at left') === false) ;
              }
            }
          } else if (exec('targetNode is 1st child') === false) {
            if (exec('targetNode is last child') === true) {
              if (exec('on targetNode middle') === true) {
                if (exec('at left') === true) {
                  targets['after target parent'](info);
                } else if (exec('at left') === false) {
                  if (exec('at indent right') === true) {
                    targets['append prev'](info);
                  } else if (exec('at indent right') === false) ;
                }
              } else if (exec('on targetNode middle') === false) {
                if (exec('at left') === true) {
                  targets['after target parent'](info);
                } else if (exec('at left') === false) {
                  if (exec('at indent right') === true) {
                    targets['append prev'](info);
                  } else if (exec('at indent right') === false) ;
                }
              }
            } else if (exec('targetNode is last child') === false) {
              if (exec('on targetNode middle') === true) {
                if (exec('at left') === true) ; else if (exec('at left') === false) {
                  if (exec('at indent right') === true) {
                    targets['append prev'](info);
                  } else if (exec('at indent right') === false) ;
                }
              } else if (exec('on targetNode middle') === false) {
                if (exec('at left') === true) ; else if (exec('at left') === false) {
                  if (exec('at indent right') === true) {
                    targets['append prev'](info);
                  } else if (exec('at indent right') === false) ;
                }
              }
            }
          }
        } else if (exec('targetNode is the second child of root') === true) {
          if (exec('on targetNode middle') === true) {
            if (exec('at indent right') === true) {
              targets['append prev'](info);
            } else if (exec('at indent right') === false) ;
          } else if (exec('on targetNode middle') === false) {
            if (exec('at indent right') === true) {
              targets['append prev'](info);
            } else if (exec('at indent right') === false) ;
          }
        }
      } else if (exec('targetNode at bottom') === true) {
        if (exec('targetNode is 1st child') === true) {
          if (exec('on targetNode middle') === false) {
            if (exec('at left') === true) {
              targets['after target parent'](info);
            } else if (exec('at left') === false) ;
          } else if (exec('on targetNode middle') === true) {
            if (exec('at left') === false) ; else if (exec('at left') === true) {
              targets['after target parent'](info);
            }
          }
        } else if (exec('targetNode is 1st child') === false) {
          if (exec('on targetNode middle') === false) {
            if (exec('at left') === true) {
              targets['after target parent'](info);
            } else if (exec('at left') === false) {
              if (exec('at indent right') === true) {
                targets['append prev'](info);
              } else if (exec('at indent right') === false) ;
            }
          } else if (exec('on targetNode middle') === true) {
            if (exec('at left') === true) {
              targets['after target parent'](info);
            } else if (exec('at left') === false) {
              if (exec('at indent right') === true) {
                targets['append prev'](info);
              } else if (exec('at indent right') === false) ;
            }
          }
        }
      }
    }
  } else if (exec('currentTree existed') === false) ; // decision end =================================
  //

}
context is vm