text: 'use strict';
  
  /* globals SVGElement */
  /**
   * Allows to drag and zoom svg elements
   */
  var wheel = require('wheel')
  var animate = require('amator')
  var eventify = require('ngraph.events');
  var kinetic = require('./lib/kinetic.js')
  var preventTextSelection = require('./lib/textSelectionInterceptor.js')()
  var Transform = require('./lib/transform.js');
  var makeSvgController = require('./lib/svgController.js')
  var makeDomController = require('./lib/domController.js')
  
  var defaultZoomSpeed = 0.065
  var defaultDoubleTapZoomSpeed = 1.75
  var doubleTapSpeedInMS = 300
  
  module.exports = createPanZoom
  
  /**
   * Creates a new instance of panzoom, so that an object can be panned and zoomed
   *
   * @param {DOMElement} domElement where panzoom should be attached.
   * @param {Object} options that configure behavior.
   */
  function createPanZoom(domElement, options) {
    options = options || {}
  
    var panController = options.controller
  
    if (!panController) {
      if (domElement instanceof SVGElement) {
        panController = makeSvgController(domElement, options)
      }
  
      if (domElement instanceof HTMLElement) {
        panController = makeDomController(domElement, options)
      }
    }
  
    if (!panController) {
      throw new Error('Cannot create panzoom for the current type of dom element')
    }
    var owner = panController.getOwner()
    // just to avoid GC pressure, every time we do intermediate transform
    // we return this object. For internal use only. Never give it back to the consumer of this library
    var storedCTMResult = {x: 0, y: 0}
  
    var isDirty = false
    var transform = new Transform()
  
    if (panController.initTransform) {
      panController.initTransform(transform)
    }
  
    var filterKey = typeof options.filterKey === 'function' ? options.filterKey : noop;
    // TODO: likely need to unite pinchSpeed with zoomSpeed
    var pinchSpeed = typeof options.pinchSpeed === 'number' ? options.pinchSpeed : 1;
    var bounds = options.bounds
    var maxZoom = typeof options.maxZoom === 'number' ? options.maxZoom : Number.POSITIVE_INFINITY
    var minZoom = typeof options.minZoom === 'number' ? options.minZoom : 0
  
    var boundsPadding = typeof options.boundsPadding === 'number' ? options.boundsPadding : 0.05
    var zoomDoubleClickSpeed = typeof options.zoomDoubleClickSpeed === 'number' ? options.zoomDoubleClickSpeed : defaultDoubleTapZoomSpeed
    var beforeWheel = options.beforeWheel || noop
    var speed = typeof options.zoomSpeed === 'number' ? options.zoomSpeed : defaultZoomSpeed
  
    validateBounds(bounds)
  
    if (options.autocenter) {
      autocenter()
    }
  
    var frameAnimation
  
    var lastTouchEndTime = 0
  
    var touchInProgress = false
  
    // We only need to fire panstart when actual move happens
    var panstartFired = false
  
    // cache mouse coordinates here
    var mouseX
    var mouseY
  
    var pinchZoomLength
  
    var smoothScroll
    if ('smoothScroll' in options && !options.smoothScroll) {
      // If user explicitly asked us not to use smooth scrolling, we obey
      smoothScroll = rigidScroll()
    } else {
      // otherwise we use forward smoothScroll settings to kinetic API
      // which makes scroll smoothing.
      smoothScroll = kinetic(getPoint, scroll, options.smoothScroll)
    }
  
    var moveByAnimation
    var zoomToAnimation
  
    var multiTouch
    var paused = false
  
    listenForEvents()
  
    var api = {
      dispose: dispose,
      moveBy: internalMoveBy,
      moveTo: moveTo,
      centerOn: centerOn,
      zoomTo: publicZoomTo,
      zoomAbs: zoomAbs,
      smoothZoom: smoothZoom,
      showRectangle: showRectangle,
  
      pause: pause,
      resume: resume,
      isPaused: isPaused,
  
      getTransform: getTransformModel,
      getMinZoom: getMinZoom,
      getMaxZoom: getMaxZoom
    }
  
    eventify(api);
  
    return api;
  
    function pause() {
      releaseEvents()
      paused = true
    }
  
    function resume() {
      if (paused) {
        listenForEvents()
        paused = false
      }
    }
  
    function isPaused() {
      return paused;
    }
  
    function showRectangle(rect) {
      // TODO: this duplicates autocenter. I think autocenter should go.
      var clientRect = owner.getBoundingClientRect()
      var size = transformToScreen(clientRect.width, clientRect.height)
  
      var rectWidth = rect.right - rect.left
      var rectHeight = rect.bottom - rect.top
      if (!Number.isFinite(rectWidth) || !Number.isFinite(rectHeight)) {
        throw new Error('Invalid rectangle');
      }
  
      var dw = size.x/rectWidth
      var dh = size.y/rectHeight
      var scale = Math.min(dw, dh)
      transform.x = -(rect.left + rectWidth/2) * scale + size.x/2
      transform.y = -(rect.top + rectHeight/2) * scale + size.y/2
      transform.scale = scale
    }
  
    function transformToScreen(x, y) {
      if (panController.getScreenCTM) {
        var parentCTM = panController.getScreenCTM()
        var parentScaleX = parentCTM.a
        var parentScaleY = parentCTM.d
        var parentOffsetX = parentCTM.e
        var parentOffsetY = parentCTM.f
        storedCTMResult.x = x * parentScaleX - parentOffsetX
        storedCTMResult.y = y * parentScaleY - parentOffsetY
      } else {
        storedCTMResult.x = x
        storedCTMResult.y = y
      }
  
      return storedCTMResult
    }
  
    function autocenter() {
      var w // width of the parent
      var h // height of the parent
      var left = 0
      var top = 0
      var sceneBoundingBox = getBoundingBox()
      if (sceneBoundingBox) {
        // If we have bounding box - use it.
        left = sceneBoundingBox.left
        top = sceneBoundingBox.top
        w = sceneBoundingBox.right - sceneBoundingBox.left
        h = sceneBoundingBox.bottom - sceneBoundingBox.top
      } else {
        // otherwise just use whatever space we have
        var ownerRect = owner.getBoundingClientRect();
        w = ownerRect.width
        h = ownerRect.height
      }
      var bbox = panController.getBBox()
      if (bbox.width === 0 || bbox.height === 0) {
        // we probably do not have any elements in the SVG
        // just bail out;
        return;
      }
      var dh = h/bbox.height
      var dw = w/bbox.width
      var scale = Math.min(dw, dh)
      transform.x = -(bbox.left + bbox.width/2) * scale + w/2 + left
      transform.y = -(bbox.top + bbox.height/2) * scale + h/2 + top
      transform.scale = scale
    }
  
    function getTransformModel() {
      // TODO: should this be read only?
      return transform
    }
  
    function getMinZoom() {
      return minZoom;
    }
  
    function getMaxZoom() {
      return maxZoom;
    }
  
    function getPoint() {
      return {
        x: transform.x,
        y: transform.y
      }
    }
  
    function moveTo(x, y) {
      transform.x = x
      transform.y = y
  
      keepTransformInsideBounds()
  
      triggerEvent('pan')
      makeDirty()
    }
  
    function moveBy(dx, dy) {
      moveTo(transform.x + dx, transform.y + dy)
    }
  
    function keepTransformInsideBounds() {
      var boundingBox = getBoundingBox()
      if (!boundingBox) return
  
      var adjusted = false
      var clientRect = getClientRect()
  
      var diff = boundingBox.left - clientRect.right
      if (diff > 0) {
        transform.x += diff
        adjusted = true
      }
      // check the other side:
      diff = boundingBox.right - clientRect.left
      if (diff < 0) {
        transform.x += diff
        adjusted = true
      }
  
      // y axis:
      diff = boundingBox.top - clientRect.bottom
      if (diff > 0) {
        // we adjust transform, so that it matches exactly our bounding box:
        // transform.y = boundingBox.top - (boundingBox.height + boundingBox.y) * transform.scale =>
        // transform.y = boundingBox.top - (clientRect.bottom - transform.y) =>
        // transform.y = diff + transform.y =>
        transform.y += diff
        adjusted = true
      }
  
      diff = boundingBox.bottom - clientRect.top
      if (diff < 0) {
        transform.y += diff
        adjusted = true
      }
      return adjusted
    }
  
    /**
     * Returns bounding box that should be used to restrict scene movement.
     */
    function getBoundingBox() {
      if (!bounds) return // client does not want to restrict movement
  
      if (typeof bounds === 'boolean') {
        // for boolean type we use parent container bounds
        var ownerRect = owner.getBoundingClientRect()
        var sceneWidth = ownerRect.width
        var sceneHeight = ownerRect.height
  
        return {
          left: sceneWidth * boundsPadding,
          top: sceneHeight * boundsPadding,
          right: sceneWidth * (1 - boundsPadding),
          bottom: sceneHeight * (1 - boundsPadding),
        }
      }
  
      return bounds
    }
  
    function getClientRect() {
      var bbox = panController.getBBox()
      var leftTop = client(bbox.left, bbox.top)
  
      return {
        left: leftTop.x,
        top: leftTop.y,
        right: bbox.width * transform.scale + leftTop.x,
        bottom: bbox.height * transform.scale + leftTop.y
      }
    }
  
    function client(x, y) {
      return {
        x: (x * transform.scale) + transform.x,
        y: (y * transform.scale) + transform.y
      }
    }
  
    function makeDirty() {
      isDirty = true
      frameAnimation = window.requestAnimationFrame(frame)
    }
  
    function zoomByRatio(clientX, clientY, ratio) {
      if (isNaN(clientX) || isNaN(clientY) || isNaN(ratio)) {
        throw new Error('zoom requires valid numbers')
      }
  
      var newScale = transform.scale * ratio
  
      if (newScale < minZoom) {
        if (transform.scale === minZoom) return;
  
        ratio = minZoom / transform.scale
      }
      if (newScale > maxZoom) {
        if (transform.scale === maxZoom) return;
  
        ratio = maxZoom / transform.scale
      }
  
      var size = transformToScreen(clientX, clientY)
  
      transform.x = size.x - ratio * (size.x - transform.x)
      transform.y = size.y - ratio * (size.y - transform.y)
  
      // TODO: https://github.com/anvaka/panzoom/issues/112
      if (bounds && boundsPadding === 1 && minZoom === 1) {
        transform.scale *= ratio
        keepTransformInsideBounds()
      } else {
        var transformAdjusted = keepTransformInsideBounds()
        if (!transformAdjusted) transform.scale *= ratio
      }
  
      triggerEvent('zoom')
  
      makeDirty()
    }
  
    function zoomAbs(clientX, clientY, zoomLevel) {
      var ratio = zoomLevel / transform.scale
      zoomByRatio(clientX, clientY, ratio)
    }
  
    function centerOn(ui) {
      var parent = ui.ownerSVGElement
      if (!parent) throw new Error('ui element is required to be within the scene')
  
      // TODO: should i use controller's screen CTM?
      var clientRect = ui.getBoundingClientRect()
      var cx = clientRect.left + clientRect.width/2
      var cy = clientRect.top + clientRect.height/2
  
      var container = parent.getBoundingClientRect()
      var dx = container.width/2 - cx
      var dy = container.height/2 - cy
  
      internalMoveBy(dx, dy, true)
    }
  
    function internalMoveBy(dx, dy, smooth) {
      if (!smooth) {
        return moveBy(dx, dy)
      }
  
      if (moveByAnimation) moveByAnimation.cancel()
  
      var from = { x: 0, y: 0 }
      var to = { x: dx, y : dy }
      var lastX = 0
      var lastY = 0
  
      moveByAnimation = animate(from, to, {
        step: function(v) {
          moveBy(v.x - lastX, v.y - lastY)
  
          lastX = v.x
          lastY = v.y
        }
      })
    }
  
    function scroll(x, y) {
      cancelZoomAnimation()
      moveTo(x, y)
    }
  
    function dispose() {
      releaseEvents();
    }
  
    function listenForEvents() {
      owner.addEventListener('mousedown', onMouseDown)
      owner.addEventListener('dblclick', onDoubleClick)
      owner.addEventListener('touchstart', onTouch)
      owner.addEventListener('keydown', onKeyDown)
  
      // Need to listen on the owner container, so that we are not limited
      // by the size of the scrollable domElement
      wheel.addWheelListener(owner, onMouseWheel)
  
      makeDirty()
    }
  
    function releaseEvents() {
      wheel.removeWheelListener(owner, onMouseWheel)
      owner.removeEventListener('mousedown', onMouseDown)
      owner.removeEventListener('keydown', onKeyDown)
      owner.removeEventListener('dblclick', onDoubleClick)
      owner.removeEventListener('touchstart', onTouch)
  
      if (frameAnimation) {
        window.cancelAnimationFrame(frameAnimation)
        frameAnimation = 0
      }
  
      smoothScroll.cancel()
  
      releaseDocumentMouse()
      releaseTouches()
  
      triggerPanEnd()
    }
  
  
    function frame() {
      if (isDirty) applyTransform()
    }
  
    function applyTransform() {
      isDirty = false
  
      // TODO: Should I allow to cancel this?
      panController.applyTransform(transform)
  
      triggerEvent('transform')
      frameAnimation = 0
    }
  
    function onKeyDown(e) {
      var x = 0, y = 0, z = 0
      if (e.keyCode === 38) {
        y = 1 // up
      } else if (e.keyCode === 40) {
        y = -1 // down
      } else if (e.keyCode === 37) {
        x = 1 // left
      } else if (e.keyCode === 39) {
        x = -1 // right
      } else if (e.keyCode === 189 || e.keyCode === 109) { // DASH or SUBTRACT
        z = 1 // `-` -  zoom out
      } else if (e.keyCode === 187 || e.keyCode === 107) { // EQUAL SIGN or ADD
        z = -1 // `=` - zoom in (equal sign on US layout is under `+`)
      }
  
      if (filterKey(e, x, y, z)) {
        // They don't want us to handle the key: https://github.com/anvaka/panzoom/issues/45
        return;
      }
  
      if (x || y) {
        e.preventDefault()
        e.stopPropagation()
  
        var clientRect = owner.getBoundingClientRect()
        // movement speed should be the same in both X and Y direction:
        var offset = Math.min(clientRect.width, clientRect.height)
        var moveSpeedRatio = 0.05
        var dx = offset * moveSpeedRatio * x
        var dy = offset * moveSpeedRatio * y
  
        // TODO: currently we do not animate this. It could be better to have animation
        internalMoveBy(dx, dy)
      }
  
      if (z) {
        var scaleMultiplier = getScaleMultiplier(z)
        var ownerRect = owner.getBoundingClientRect()
        publicZoomTo(ownerRect.width/2, ownerRect.height/2, scaleMultiplier)
      }
    }
  
    function onTouch(e) {
      // let the override the touch behavior
      beforeTouch(e);
  
      if (e.touches.length === 1) {
        return handleSingleFingerTouch(e, e.touches[0])
      } else if (e.touches.length === 2) {
        // handleTouchMove() will care about pinch zoom.
        pinchZoomLength = getPinchZoomLength(e.touches[0], e.touches[1])
        multiTouch  = true
        startTouchListenerIfNeeded()
      }
    }
  
    function beforeTouch(e) {
      if (options.onTouch && !options.onTouch(e)) {
        // if they return `false` from onTouch, we don't want to stop
        // events propagation. Fixes https://github.com/anvaka/panzoom/issues/12
        return
      }
  
      e.stopPropagation()
      e.preventDefault()
    }
  
    function beforeDoubleClick(e) {
      if (options.onDoubleClick && !options.onDoubleClick(e)) {
        // if they return `false` from onTouch, we don't want to stop
        // events propagation. Fixes https://github.com/anvaka/panzoom/issues/46
        return
      }
  
      e.preventDefault()
      e.stopPropagation()
    }
  
    function handleSingleFingerTouch(e) {
      var touch = e.touches[0]
      var offset = getOffsetXY(touch)
      mouseX = offset.x
      mouseY = offset.y
  
      smoothScroll.cancel()
      startTouchListenerIfNeeded()
    }
  
    function startTouchListenerIfNeeded() {
      if (!touchInProgress) {
        touchInProgress = true
        document.addEventListener('touchmove', handleTouchMove)
        document.addEventListener('touchend', handleTouchEnd)
        document.addEventListener('touchcancel', handleTouchEnd)
      }
    }
  
    function handleTouchMove(e) {
      if (e.touches.length === 1) {
        e.stopPropagation()
        var touch = e.touches[0]
  
        var offset = getOffsetXY(touch)
  
        var dx = offset.x - mouseX
        var dy = offset.y - mouseY
  
        if (dx !== 0 && dy !== 0) {
          triggerPanStart()
        }
        mouseX = offset.x
        mouseY = offset.y
        var point = transformToScreen(dx, dy)
        internalMoveBy(point.x, point.y)
      } else if (e.touches.length === 2) {
        // it's a zoom, let's find direction
        multiTouch = true
        var t1 = e.touches[0]
        var t2 = e.touches[1]
        var currentPinchLength = getPinchZoomLength(t1, t2)
  
        // since the zoom speed is always based on distance from 1, we need to apply
        // pinch speed only on that distance from 1:
        var scaleMultiplier = 1 + (currentPinchLength / pinchZoomLength - 1) * pinchSpeed
  
        mouseX = (t1.clientX + t2.clientX)/2
        mouseY = (t1.clientY + t2.clientY)/2
  
        publicZoomTo(mouseX, mouseY, scaleMultiplier)
  
        pinchZoomLength = currentPinchLength
        e.stopPropagation()
        e.preventDefault()
      }
    }
  
    function handleTouchEnd(e) {
      if (e.touches.length > 0) {
        var offset = getOffsetXY(e.touches[0])
        mouseX = offset.x
        mouseY = offset.y
      } else {
        var now = new Date()
        if (now - lastTouchEndTime < doubleTapSpeedInMS) {
          smoothZoom(mouseX, mouseY, zoomDoubleClickSpeed)
        }
  
        lastTouchEndTime = now
  
        touchInProgress = false
        triggerPanEnd()
        releaseTouches()
      }
    }
  
    function getPinchZoomLength(finger1, finger2) {
      var dx = finger1.clientX - finger2.clientX
      var dy = finger1.clientY - finger2.clientY
      return Math.sqrt(dx * dx + dy * dy)
    }
  
    function onDoubleClick(e) {
      beforeDoubleClick(e);
      var offset = getOffsetXY(e)
      smoothZoom(offset.x, offset.y, zoomDoubleClickSpeed)
    }
  
    function onMouseDown(e) {
      if (touchInProgress) {
        // modern browsers will fire mousedown for touch events too
        // we do not want this: touch is handled separately.
        e.stopPropagation()
        return false
      }
      // for IE, left click == 1
      // for Firefox, left click == 0
      var isLeftButton = ((e.button === 1 && window.event !== null) || e.button === 0)
      if (!isLeftButton) return
  
      smoothScroll.cancel()
  
      var offset = getOffsetXY(e);
      var point = transformToScreen(offset.x, offset.y)
      mouseX = point.x
      mouseY = point.y
  
      // We need to listen on document itself, since mouse can go outside of the
      // window, and we will loose it
      document.addEventListener('mousemove', onMouseMove)
      document.addEventListener('mouseup', onMouseUp)
  
      preventTextSelection.capture(e.target || e.srcElement)
  
      return false
    }
  
    function onMouseMove(e) {
      // no need to worry about mouse events when touch is happening
      if (touchInProgress) return
  
      triggerPanStart()
  
      var offset = getOffsetXY(e);
      var point = transformToScreen(offset.x, offset.y)
      var dx = point.x - mouseX
      var dy = point.y - mouseY
  
      mouseX = point.x
      mouseY = point.y
  
      internalMoveBy(dx, dy)
    }
  
    function onMouseUp() {
      preventTextSelection.release()
      triggerPanEnd()
      releaseDocumentMouse()
    }
  
    function releaseDocumentMouse() {
      document.removeEventListener('mousemove', onMouseMove)
      document.removeEventListener('mouseup', onMouseUp)
      panstartFired = false
    }
  
    function releaseTouches() {
      document.removeEventListener('touchmove', handleTouchMove)
      document.removeEventListener('touchend', handleTouchEnd)
      document.removeEventListener('touchcancel', handleTouchEnd)
      panstartFired = false
      multiTouch = false
    }
  
    function onMouseWheel(e) {
      // if client does not want to handle this event - just ignore the call
      if (beforeWheel(e)) return
  
      smoothScroll.cancel()
  
      var scaleMultiplier = getScaleMultiplier(e.deltaY)
  
      if (scaleMultiplier !== 1) {
        var offset = getOffsetXY(e)
        publicZoomTo(offset.x, offset.y, scaleMultiplier)
        e.preventDefault()
      }
    }
  
    function getOffsetXY(e) {
      var offsetX, offsetY;
      // I tried using e.offsetX, but that gives wrong results for svg, when user clicks on a path.
      var ownerRect = owner.getBoundingClientRect();
      offsetX = e.clientX - ownerRect.left
      offsetY = e.clientY - ownerRect.top
  
      return {x: offsetX, y: offsetY};
    }
  
    function smoothZoom(clientX, clientY, scaleMultiplier) {
        var fromValue = transform.scale
        var from = {scale: fromValue}
        var to = {scale: scaleMultiplier * fromValue}
  
        smoothScroll.cancel()
        cancelZoomAnimation()
  
        zoomToAnimation = animate(from, to, {
          step: function(v) {
            zoomAbs(clientX, clientY, v.scale)
          }
        })
    }
  
    function publicZoomTo(clientX, clientY, scaleMultiplier) {
        smoothScroll.cancel()
        cancelZoomAnimation()
        return zoomByRatio(clientX, clientY, scaleMultiplier)
    }
  
    function cancelZoomAnimation() {
        if (zoomToAnimation) {
            zoomToAnimation.cancel()
            zoomToAnimation = null
        }
    }
  
    function getScaleMultiplier(delta) {
      var scaleMultiplier = 1
      if (delta > 0) { // zoom out
        scaleMultiplier = (1 - speed)
      } else if (delta < 0) { // zoom in
        scaleMultiplier = (1 + speed)
      }
  
      return scaleMultiplier
    }
  
    function triggerPanStart() {
      if (!panstartFired) {
        triggerEvent('panstart')
        panstartFired = true
        smoothScroll.start()
      }
    }
  
    function triggerPanEnd() {
      if (panstartFired) {
        // we should never run smooth scrolling if it was multiTouch (pinch zoom animation):
        if (!multiTouch) smoothScroll.stop()
        triggerEvent('panend')
      }
    }
  
    function triggerEvent(name) {
      api.fire(name, api);
    }
  }
  
  function noop() { }
  
  function validateBounds(bounds) {
    var boundsType = typeof bounds
    if (boundsType === 'undefined' || boundsType === 'boolean') return // this is okay
    // otherwise need to be more thorough:
    var validBounds = isNumber(bounds.left) && isNumber(bounds.top) &&
      isNumber(bounds.bottom) && isNumber(bounds.right)
  
    if (!validBounds) throw new Error('Bounds object is not valid. It can be: ' +
      'undefined, boolean (true|false) or an object {left, top, right, bottom}')
  }
  
  function isNumber(x) {
    return Number.isFinite(x)
  }
  
  // IE 11 does not support isNaN:
  function isNaN(value) {
    if (Number.isNaN) {
      return Number.isNaN(value)
    }
  
    return value !== value
  }
  
  function rigidScroll() {
    return {
      start: noop,
      stop: noop,
      cancel: noop
    }
  }
  
  
  function autoRun() {
    if (typeof document === 'undefined') return
  
    var scripts = document.getElementsByTagName('script');
    if (!scripts) return;
    var panzoomScript;
  
    for (var i = 0; i < scripts.length; ++i) {
      var x = scripts[i];
      if (x.src && x.src.match(/\bpanzoom(\.min)?\.js/)) {
        panzoomScript = x
        break;
      }
    }
  
    if (!panzoomScript) return;
  
    var query = panzoomScript.getAttribute('query')
    if (!query) return;
  
    var globalName = panzoomScript.getAttribute('name') || 'pz'
    var started = Date.now()
  
    tryAttach();
  
    function tryAttach() {
      var el = document.querySelector(query)
      if (!el) {
        var now = Date.now()
        var elapsed = now - started;
        if (elapsed < 2000) {
          // Let's wait a bit
          setTimeout(tryAttach, 100);
          return;
        }
        // If we don't attach within 2 seconds to the target element, consider it a failure
        console.error('Cannot find the panzoom element', globalName)
        return
      }
      var options = collectOptions(panzoomScript)
      console.log(options)
      window[globalName] = createPanZoom(el, options);
    }
  
    function collectOptions(script) {
      var attrs = script.attributes;
      var options = {};
      for(var i = 0; i < attrs.length; ++i) {
        var attr = attrs[i];
        var nameValue = getPanzoomAttributeNameValue(attr);
        if (nameValue) {
          options[nameValue.name] = nameValue.value
        }
      }
  
      return options;
    }
  
    function getPanzoomAttributeNameValue(attr) {
      if (!attr.name) return;
      var isPanZoomAttribute = attr.name[0] === 'p' && attr.name[1] === 'z' && attr.name[2] === '-';
  
      if (!isPanZoomAttribute) return;
  
      var name = attr.name.substr(3)
      var value = JSON.parse(attr.value);
      return {name: name, value: value};
    }
  }
  
  autoRun();
  