text: #!/usr/bin/env python
  
  # Copyright (c) 2018, DIANA-HEP
  # All rights reserved.
  # 
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are met:
  # 
  # * Redistributions of source code must retain the above copyright notice, this
  #   list of conditions and the following disclaimer.
  # 
  # * Redistributions in binary form must reproduce the above copyright notice,
  #   this list of conditions and the following disclaimer in the documentation
  #   and/or other materials provided with the distribution.
  # 
  # * Neither the name of the copyright holder nor the names of its
  #   contributors may be used to endorse or promote products derived from
  #   this software without specific prior written permission.
  # 
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  import argparse
  import errno
  import getpass
  import json
  import os
  import re
  import socket
  import sys
  import threading
  import time
  import webbrowser
  
  if sys.version_info[0] < 3:
      import SimpleHTTPServer
      import SocketServer
      from urllib2 import urlopen
      from urlparse import urlparse
      class BrokenPipeError(Exception): pass
  else:
      import http.server as SimpleHTTPServer
      import socketserver as SocketServer
      from urllib.request import urlopen
      from urllib.parse import urlparse
      unicode = str
  
  __version__ = "1.0.6"
  version = __version__
  version_info = tuple(re.split(r"[-\.]", __version__))
  
  class Canvas(object):
      """A general Vega canvas that can be viewed anywhere on the internet.
  
      Args:
          title (string or None): title for this canvas, can be changed, used as a file name for saved graphics.
          initial (string, dict, or None; URL or JSON): first Vega graphic to display, defaults to logo.
          host (string): host name to bind to, default is "0.0.0.0" for any address.
          port (integer): port to bind to, default is 0 for any open port.
          verbose (boolean): if True (default), print messages when web browsers connect or disconnect.
  
      Attributes:
          connection (dict): web browser URL and possibly terminal command (for TunnelCanvas).
          title (string): current title.
          spec (string or dict; URL or JSON): current Vega graphic.
          httpd (socketserver.ThreadingTCPServer): web server object.
          ip (string): IP address of server as seen from outside ("localhost" for LocalCanvas and TunnelCanvas).
          host (string): actual host used by web server.
          port (string): actual port used by web server.
          thread (threading.Thread): thread in which the web server is running.
          connected (list of strings): currently connected web browser clients.
          closed (boolean): True if the server has shut down, False otherwise.
      """
  
      def __init__(self, title=None, initial=None, host="0.0.0.0", port=0, verbose=True):
          self._lock = threading.Lock()
  
          if title is None:
              self._title = "VegaScope"
          else:
              self._title = title
  
          if initial is None:
              self.spec = Canvas._default
          else:
              self.spec = initial
  
          self._action = None
          self._actionevent = threading.Event()
  
          canvas = self
  
          class FakeFile(object):
              @property
              def closed(self):
                  return True
              def close(self):
                  pass
              def flush(self):
                  pass
  
          class HTTPHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
              def do_HEAD(self):
                  pass
  
              def do_GET(self):
                  if self.path == "/":
                      self.send_response(200)
                      self.send_header("Content-type", "text/html")
                      self.end_headers()
                      page = canvas._template.replace("VEGAVIEW", "#vegaview").replace("TITLE", canvas._title).replace("SPEC", canvas._spec).encode("utf-8")
                      self.wfile.write(page)
  
                  elif self.path == "/update":
                      self.send_response(200)
                      self.send_header("Content-type", "text/event-stream")
                      self.end_headers()
                      client = self.client_address[0]
                      canvas._connected.add(client)
                      if canvas.verbose:
                          sys.stdout.write("{0} connected\n".format(client))
                          sys.stdout.flush()
  
                      title = canvas._title
                      spec = canvas._spec
                      try:
                          while not self.wfile.closed:
                              time.sleep(0.1)
                              with canvas._lock:
                                  if canvas._spec is None:
                                      break
                                  elif spec != canvas._spec or title != canvas._title or canvas._action is not None:
                                      spec = canvas._spec
                                      title = canvas._title
                                      self.wfile.write(b"data: " + json.dumps({"title": title, "spec": json.loads(spec), "action": canvas._action}).encode("utf-8") + b"\n\n")
                                      canvas._action = None
                                      canvas._actionevent.set()
                                  else:
                                      self.wfile.write(":\n\n".encode("utf-8"))
                              self.wfile.flush()
                              
                      except socket.error as err:
                          if isinstance(err, BrokenPipeError) or err[0] == errno.EPIPE:
                              self.wfile = FakeFile()
                          else:
                              raise
  
                      finally:
                          canvas._connected.discard(client)
                          if canvas.verbose:
                              sys.stdout.write("{0} disconnected\n".format(client))
                              sys.stdout.flush()
  
                  elif self.path == "/vega.min.js":
                      self.send_response(200)
                      self.send_header("Content-type", "application/javascript")
                      self.end_headers()
                      self.wfile.write(canvas._vega)
  
                  elif self.path == "/vega-lite.min.js":
                      self.send_response(200)
                      self.send_header("Content-type", "application/javascript")
                      self.end_headers()
                      self.wfile.write(canvas._vegalite)
  
                  elif self.path == "/vega-embed.min.js":
                      self.send_response(200)
                      self.send_header("Content-type", "application/javascript")
                      self.end_headers()
                      self.wfile.write(canvas._vegaembed)
  
              def log_request(self, code="-", size="-"):
                  pass
  
              def log_error(self, format, *args):
                  pass
  
              def log_message(self, format, *args):
                  pass
  
          self._httpd = SocketServer.ThreadingTCPServer((host, port), HTTPHandler)
          self._host, self._port = self._httpd.server_address
  
          self._thread = threading.Thread(name=self._title, target=self._httpd.serve_forever)
          self._thread.daemon = True
          self._thread.start()
  
          self.verbose = verbose
          self._connected = set()
  
          self._launch()
  
      def _launch(self):
          if self.verbose:
              self.how()
  
      @property
      def title(self):
          return self._title
  
      @title.setter
      def title(self, value):
          self._specify(value, None, None)
  
      @property
      def spec(self):
          return self._spec
  
      @spec.setter
      def spec(self, value):
          self._specify(None, value, None)
  
      def __call__(self, spec):
          """Update the Vega graphic to spec (string or dict; URL or JSON).
          """
          self._specify(None, spec, None)
  
      def png(self, spec, title=None):
          """Update the Vega graphic to spec, optionally set a title, and make connected web clients save the image as PNG.
  
          Note that pop-up blockers won't let remote servers save files on your computer without your permission. You will probably have to respond to the pop-up blocker's notice to enable pop-ups and try again (once per host/port combination).
  
          This method blocks until the PNG request has been sent, so it can be called in a loop to make lots of files.
  
          Args:
              spec (string or dict; URL or JSON): new Vega graphic.
              title (string or None): new title.
          """
          self._specify(title, spec, "png")
          self._actionevent.wait()
  
      def svg(self, spec, title=None):
          """Update the Vega graphic to spec, optionally set a title, and make connected web clients save the image as SVG.
  
          Note that pop-up blockers won't let remote servers save files on your computer without your permission. You will probably have to respond to the pop-up blocker's notice to enable pop-ups and try again (once per host/port combination).
  
          This method blocks until the SVG request has been sent, so it can be called in a loop to make lots of files.
  
          SVG files can be converted into clean, rescalable PDFs.
  
          Args:
              spec (string or dict; URL or JSON): new Vega graphic.
              title (string or None): new title.
          """
          self._specify(title, spec, "svg")
          self._actionevent.wait()
  
      def _specify(self, title, spec, action):
          with self._lock:
              if title is not None:
                  if isinstance(title, (unicode, str)):
                      self._title = title
                  else:
                      raise TypeError("title must be a string")
  
              if spec is not None:
                  if isinstance(spec, bytes):
                      spec = spec.decode("utf-8")
  
                  if isinstance(spec, (unicode, str)):
                      p = urlparse(spec)
                      if p.scheme != "":
                          self._spec = json.dumps(spec)                                 # spec is a URL; wrap it with quotes for JSON
                      else:
                          self._spec = json.dumps(json.loads(spec), allow_nan=False)    # not a URL; ensure that it's JSON and a one-liner
                  else:
                      # PdVega
                      if spec.__class__.__module__.startswith("pdvega") and hasattr(spec, "spec"):
                          spec = spec.spec
                      # Altair
                      elif hasattr(spec, "to_json") and callable(spec.to_json):
                          spec = json.loads(spec.to_json())
  
                      self._spec = json.dumps(spec, allow_nan=False)                    # spec is an object; encode it as JSON
  
              if action is not None:
                  self._action = action
  
      @property
      def httpd(self):
          return self._httpd
  
      @property
      def host(self):
          return self._host
  
      @property
      def port(self):
          return self._port
  
      @property
      def thread(self):
          return self._thread
  
      @property
      def connected(self):
          return sorted(self._connected)
  
      def close(self):
          """Shut down the web server, disconnecting all client browsers.
          """
          self._spec = None
          if hasattr(self, "_httpd"):
              self._httpd.shutdown()
              self._httpd.server_close()
  
      @property
      def closed(self):
          return self._spec is None
  
      def __del__(self):
          if not self.closed:
              self.close()
  
      def __enter__(self, *args, **kwds):
          return self
  
      def __exit__(self, *args, **kwds):
          if not self.closed:
              self.close()
  
      @property
      def connection(self):
          return {"browser": "http://{ip}:{port}".format(ip=self.ip, port=self._port)}
  
      def how(self):
          """Print instructions for connecting to the web server.
  
          Called automatically by the constructor unless verbose=False.
          """
          connection = self.connection
          if "terminal" in connection:
              sys.stdout.write("Type into terminal:   " + connection["terminal"] + "\n")
          sys.stdout.write("Point web browser at: " + connection["browser"] + "\n")
          sys.stdout.flush()
          
      @property
      def ip(self):
          return urlopen("https://v4.ident.me").read().decode("ascii").strip()
  
  class LocalCanvas(Canvas):
      """A Vega canvas that can only be viewed by the machine on which it is running.
      """
      __doc__ += "\n".join(Canvas.__doc__.split("\n")[1:])
  
      def __init__(self, title=None, initial=None, port=0, verbose=True, newtab=True):
          self._newtab = newtab
          super(LocalCanvas, self).__init__(title=title, initial=initial, host="localhost", port=port, verbose=verbose)
  
      def _launch(self):
          if self.verbose and not self._newtab:
              self.how()
          if self._newtab:
              webbrowser.open_new_tab(self.connection["browser"])
  
      @property
      def ip(self):
          return "localhost"
  
  class TunnelCanvas(Canvas):
      """A Vega canvas that can only be viewed by the machine on which it is running or through an ssh tunnel.
      """
      __doc__ += "\n".join(Canvas.__doc__.split("\n")[1:])
  
      def __init__(self, title=None, initial=None, port=0, verbose=True):
          super(TunnelCanvas, self).__init__(title=title, initial=initial, host="localhost", port=port, verbose=verbose)
  
      @property
      def connection(self):
          return {"terminal": "ssh -L {port}:localhost:{port} {user}@{ip}".format(port=self._port, user=getpass.getuser(), ip=self.ip),
                  "browser": "http://localhost:{port}".format(port=self._port)}
  
  Canvas._default = {
    "$schema": "https://vega.github.io/schema/vega-lite/v2.json",
    "data": {"values": [{"x": "plot goes here"}]},
    "mark": "text",
    "encoding": {"text": {"field": "x"}},
    "config": {"text": {"baseline": "middle", "align": "center"}}
  }
  
  Canvas._template = u"""
  <!DOCTYPE html>
  <html>
    <head>
      <meta charset="utf-8">
      <script src="vega.min.js"></script>
      <script src="vega-lite.min.js"></script>
      <script src="vega-embed.min.js"></script>
      <title id="title">TITLE</title>
    </head>
    <body>
      <div style="text-align: center">
        <div style="display: inline-block; text-align: center">
          <div style="display: inline-block; width: 500px; margin-top: 10px; margin-bottom: 10px;">
            <button id="png" style="float: left; margin-right: 5px">Save as PNG</button>
            <button id="svg" style="float: left">as SVG</button>
            <button id="plus">+</button>
            <input  id="zoom" type="text" value="100" size="4" style="text-align: right">%
            <button id="minus">\u2212</button>
            <button id="editor" style="float: right; margin-left: 5px">in editor</button>
            <button id="source" style="float: right">View source</button>
          </div>
  
          <div id="viewer" style="transform: scale(1.0); transform-origin: 50% 0%">
            <div id="vegaview"></div>
          </div>
        </div>
      </div>
      <div id="screen" style="position: fixed; padding: 0; margin: 0; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; background: rgba(255, 255, 255, 0.0);"></div>
      <script type="text/javascript">
  
  function setzoom() {
      var s = Number(document.getElementById("zoom").value);
      if (isNaN(s)  ||  s <= 0) {
          document.getElementById("zoom").value = 100;
          s = 100;
      }
      document.getElementById("viewer").style.transform = "scale(" + (s / 100.0) + ")";
  }
  
  document.getElementById("plus").addEventListener("click", function(event) {
      document.getElementById("zoom").value = (Math.round(Number(document.getElementById("zoom").value) / 20.0) + 1) * 20;
      setzoom();
  });
  
  document.getElementById("minus").addEventListener("click", function(event) {
      document.getElementById("zoom").value = Math.max(20, (Math.round(Number(document.getElementById("zoom").value) / 20.0) - 1) * 20);
      setzoom();
  });
  
  document.getElementById("zoom").addEventListener("keyup", function(event) {
      event.preventDefault();
      if (event.keyCode === 13) {
          setzoom();
      }
  });
  
  var title = document.getElementById("title").innerHTML;
  var spec;
  var view;
  var mode;
  
  function setspec(x) {
      spec = x;
      vegaEmbed("VEGAVIEW", x, {
          renderer: "svg",
          actions: false
      }).then(function(x) {
          view = x.view;
          var s = x.spec.$schema.split("/")
          if (s.indexOf("vega") > -1) {
              mode = "vega";
          }
          else if (s.indexOf("vega-lite") > -1) {
              mode = "vega-lite";
          }
          else {
              mode = "unknown";
          }
      }).catch(function(error) { alert(error); });
  }
  
  setspec(SPEC);
  
  function savePNG(event) {
      view.toImageURL("png").then(function(url) {
          var link = document.createElement("a");
          link.setAttribute("href", url);
          link.setAttribute("target", "_blank");
          link.setAttribute("download", title + ".png");
          link.dispatchEvent(new MouseEvent("click"));
      }).catch(function(error) { alert(error); });
  }
  
  document.getElementById("png").addEventListener("click", savePNG);
  
  function saveSVG(event) {
      view.toImageURL("svg").then(function(url) {
          var link = document.createElement("a");
          link.setAttribute("href", url);
          link.setAttribute("target", "_blank");
          link.setAttribute("download", title + ".svg");
          link.dispatchEvent(new MouseEvent("click"));
      }).catch(function(error) { alert(error); });
  }
  
  document.getElementById("svg").addEventListener("click", saveSVG);
  
  document.getElementById("source").addEventListener("click", function(event) {
      var w = window.open("");
      w.document.write("<html><head><title>" + title + ' (source)</title></head><body><pre><code class="json">' + JSON.stringify(spec, null, 2) + "</code></body></html>");
  });
  
  document.getElementById("editor").addEventListener("click", function(event) {
      var w = window.open("https://vega.github.io/editor");
      var wait = 10000;
      var step = 250;
      var count = ~~(wait / step);
  
      function listen(event) {
          if (event.source == w) {
              count = 0;
              window.removeEventListener("message", listen, false);
          }
      }
      window.addEventListener("message", listen, false);
  
      var specstring = JSON.stringify(spec, null, 2);
  
      function send() {
          if (count <= 0) {
              return;
          }
          w.postMessage({"mode": mode, "spec": specstring}, "*");
          setTimeout(send, step);
          count -= 1;
      }
      setTimeout(send, step);
  });
  
  var eventSource = new EventSource("/update");
  
  eventSource.onmessage = function(event) {
      document.getElementById("screen").style.background = "rgba(255, 255, 255, 0.0)";
      var data = JSON.parse(event.data);
      title = data["title"];
      document.getElementById("title").innerHTML = title;
      setspec(data["spec"]);
      if (data["action"] == "png") {
          savePNG(null);
      }
      if (data["action"] == "svg") {
          saveSVG(null);
      }
  };
  
  eventSource.onerror = function(event) {
      document.getElementById("screen").style.background = "rgba(255, 255, 255, 0.75)";
  };
  
  eventSource.onopen = function() {
      document.getElementById("screen").style.background = "rgba(255, 255, 255, 0.0)";
  };
  
      </script>
    </body>
  </html>
  """
  
  # vega-3.2.1.min.js
  Canvas._vega = b'!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e(t.vega=t.vega||{})}(this,function(y){"use strict";var g=function(t,e,n){return t.fields=e||[],t.fname=n,t};function M(t){return null==t?null:t.fname}function x(t){return null==t?null:t.fields}var rt=function(t){throw Error(t)},m=function(t){var e,n,r,i=[],a=null,o=0,u=t.length,s="";function f(){i.push(s+t.substring(e,n)),s="",e=n+1}for(t+="",e=n=0;n<u;++n)if("\\\\"===(r=t[n]))s+=t.substring(e,n),e=++n;else if(r===a)f(),a=null,o=-1;else{if(a)continue;e===o&&\'"\'===r?(e=n+1,a=r):e===o&&"\'"===r?(e=n+1,a=r):"."!==r||o?"["===r?(e<n&&f(),o=e=n+1):"]"===r&&(o||rt("Access path missing open bracket: "+t),0<o&&f(),o=0,e=n+1):e<n?f():e=n+1}return o&&rt("Access path missing closing bracket: "+t),a&&rt("Access path missing closing quote: "+t),e<n&&(n++,f()),i},d=Array.isArray,J=function(t){return 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i,r=this&&this.__extends||(i=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(e,t){e.__proto__=t}||function(e,t){for(var n in t)t.hasOwnProperty(n)&&(e[n]=t[n])},function(e,t){function n(){this.constructor=e}i(e,t),e.prototype=null===t?Object.create(t):(n.prototype=t.prototype,new n)}),s=this&&this.__assign||Object.assign||function(e){for(var t,n=1,i=arguments.length;n<i;n++)for(var r in t=arguments[n])Object.prototype.hasOwnProperty.call(t,r)&&(e[r]=t[r]);return e};Object.defineProperty(n,"__esModule",{value:!0});var l=e("../../channel"),c=e("../../type"),u=e("../../util"),o=function(o){function a(e,t,n,i){var r=o.call(this,e)||this;return r.fields=t,r.geojson=n,r.signal=i,r}return r(a,o),a.prototype.clone=function(){return new a(null,u.duplicate(this.fields),this.geojson,this.signal)},a.parseAll=function(n,i){var r=0;if([[l.LONGITUDE,l.LATITUDE],[l.LONGITUDE2,l.LATITUDE2]].forEach(function(e){var t=e.map(function(e){return i.channelHasField(e)?i.fieldDef(e).field:void 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t={},n="header"===e?"headerBand":"footerBand",i=0,r=["row","column"];i<r.length;i++){var o=r[i],a=this.component.layoutHeaders[o][e];if(a&&a[0]){var s="row"===o?"height":"width";this.child.component.layoutSize.get(s)||(t[n]=t[n]||{},t[n][o]=.5)}}return t},u.prototype.assembleLayout=function(){var e=this.channelHasField("column")?this.columnDistinctSignal():1;return f({padding:{row:10,column:10}},this.getLayoutBandMixins("header"),this.getLayoutBandMixins("footer"),{offset:10,columns:e,bounds:"full",align:"all"})},u.prototype.assembleLayoutSignals=function(){return this.child.assembleLayoutSignals()},u.prototype.columnDistinctSignal=function(){if(!(this.parent&&this.parent instanceof u))return{signal:"length(data(\'"+this.getName("column_domain")+"\'))"}},u.prototype.assembleGroup=function(e){return this.parent&&this.parent instanceof 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n=this.assembleLayout();n&&(t.layout=n),t.marks=[].concat(this.assembleHeaderMarks(),this.assembleMarks());var i=!this.parent||k(this.parent)?x.assembleScales(this):[];0<i.length&&(t.scales=i);var r=this.assembleAxes();0<r.length&&(t.axes=r);var o=this.assembleLegends();return 0<o.length&&(t.legends=o),t},e.prototype.hasDescendantWithFieldOnChannel=function(e){for(var t=0,n=this.children;t<n.length;t++){var i=n[t];if(D(i)){if(i.channelHasField(e))return!0}else if(i.hasDescendantWithFieldOnChannel(e))return!0}return!1},e.prototype.getName=function(e){return m.varName((this.name?this.name+"_":"")+e)},e.prototype.requestDataName=function(e){var t=this.getName(e),n=this.component.data.outputNodeRefCounts;return n[t]=(n[t]||0)+1,t},e.prototype.getSizeSignalRef=function(e){if(k(this.parent)){var t="width"===e?"x":"y",n=this.component.scales[t];if(n&&!n.merged){var i=n.get("type"),r=n.get("range");if(f.hasDiscreteDomain(i)&&h.isVgRangeStep(r)){var o=n.get("name"),a=w.assembleDomain(this,t),s=w.getFieldFromDomain(a);if(s){var l=c.vgField({aggregate:"distinct",field:s},{expr:"datum"});return{signal:b.sizeExpr(o,n,l)}}return u.warn("Unknown field for ${channel}.  Cannot calculate view size."),null}}}return{signal:this.layoutSizeNameMap.get(this.getName(e))}},e.prototype.lookupDataSource=function(e){var t=this.component.data.outputNodes[e];return t?t.getSource():e},e.prototype.getSizeName=function(e){return this.layoutSizeNameMap.get(e)},e.prototype.renameLayoutSize=function(e,t){this.layoutSizeNameMap.rename(e,t)},e.prototype.renameScale=function(e,t){this.scaleNameMap.rename(e,t)},e.prototype.renameProjection=function(e,t){this.projectionNameMap.rename(e,t)},e.prototype.scaleName=function(e,t){return t?this.getName(e):o.isChannel(e)&&o.isScaleChannel(e)&&this.component.scales[e]||this.scaleNameMap.has(this.getName(e))?this.scaleNameMap.get(this.getName(e)):void 0},e.prototype.projectionName=function(e){return e?this.getName("projection"):this.component.projection&&!this.component.projection.merged||this.projectionNameMap.has(this.getName("projection"))?this.projectionNameMap.get(this.getName("projection")):void 0},e.prototype.getScaleComponent=function(e){if(!this.component.scales)throw new Error("getScaleComponent cannot be called before parseScale().  Make sure you have called parseScale or use parseUnitModelWithScale().");var t=this.component.scales[e];return t&&!t.merged?t:this.parent?this.parent.getScaleComponent(e):void 0},e.prototype.getSelectionComponent=function(e,t){var n=this.component.selection[e];if(!n&&this.parent&&(n=this.parent.getSelectionComponent(e,t)),!n)throw new Error(u.message.selectionNotFound(t));return n},e}(),A=function(e){function t(){return null!==e&&e.apply(this,arguments)||this}return r(t,e),t.prototype.vgField=function(e,t){void 0===t&&(t={});var n=this.fieldDef(e);if(n)return c.vgField(n,t)},t.prototype.reduceFieldDef=function(r,e,t){return l.reduce(this.getMapping(),function(e,t,n){var i=c.getFieldDef(t);return i?r(e,i,n):e},e,t)},t.prototype.forEachFieldDef=function(i,e){l.forEach(this.getMapping(),function(e,t){var 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n(){this.constructor=e}i(e,t),e.prototype=null===t?Object.create(t):(n.prototype=t.prototype,new n)});Object.defineProperty(n,"__esModule",{value:!0});var s=e("../log"),o=e("./baseconcat"),m=e("./buildmodel"),l=e("./layoutsize/parse"),a=function(a){function e(e,t,n,i,r){var o=a.call(this,e,t,n,r,e.resolve)||this;return o.type="repeat",e.resolve&&e.resolve.axis&&("shared"===e.resolve.axis.x||"shared"===e.resolve.axis.y)&&s.warn(s.message.REPEAT_CANNOT_SHARE_AXIS),o.repeat=e.repeat,o.children=o._initChildren(e,o.repeat,i,r),o}return r(e,a),e.prototype._initChildren=function(e,t,n,i){for(var r=[],o=t.row||[n?n.row:null],a=t.column||[n?n.column:null],s=0,l=o;s<l.length;s++)for(var c=l[s],u=0,f=a;u<f.length;u++){var d=f[u],p=(c?"_"+c:"")+(d?"_"+d:""),g={row:c,column:d};r.push(m.buildModel(e.spec,this,this.getName("child"+p),void 0,g,i,!1))}return r},e.prototype.parseLayoutSize=function(){l.parseRepeatLayoutSize(this)},e.prototype.assembleLayout=function(){return{padding:{row:10,column:10},offset:10,columns:this.repeat&&this.repeat.column?this.repeat.column.length:1,bounds:"full",align:"all"}},e}(o.BaseConcatModel);n.RepeatModel=a},{"../log":110,"./baseconcat":22,"./buildmodel":23,"./layoutsize/parse":50}],74:[function(e,t,n){"use strict";var i=this&&this.__assign||Object.assign||function(e){for(var t,n=1,i=arguments.length;n<i;n++)for(var r in t=arguments[n])Object.prototype.hasOwnProperty.call(t,r)&&(e[r]=t[r]);return e},r=this&&this.__rest||function(e,t){var n={};for(var i in e)Object.prototype.hasOwnProperty.call(e,i)&&t.indexOf(i)<0&&(n[i]=e[i]);if(null!=e&&"function"==typeof Object.getOwnPropertySymbols){var r=0;for(i=Object.getOwnPropertySymbols(e);r<i.length;r++)t.indexOf(i[r])<0&&(n[i[r]]=e[i[r]])}return n};Object.defineProperty(n,"__esModule",{value:!0});var 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g(e)?x(e,t):o(e)?l({},e,{condition:x(e.condition,t)}):e},n.normalizeFieldDef=x,n.normalizeBin=w;var N={compatible:!0};function T(e,t){switch(t){case"row":case"column":return v(e)&&!e.timeUnit?{compatible:!1,warning:f.message.facetChannelShouldBeDiscrete(t)}:N;case"x":case"y":case"color":case"fill":case"stroke":case"text":case"detail":case"key":case"tooltip":case"href":return N;case"longitude":case"longitude2":case"latitude":case"latitude2":return e.type!==p.QUANTITATIVE?{compatible:!1,warning:"Channel "+t+" should not be used with "+e.type+" field."}:N;case"opacity":case"size":case"x2":case"y2":return h(e)&&!e.bin?{compatible:!1,warning:"Channel "+t+" should not be used with discrete field."}:N;case"shape":return"nominal"!==e.type&&"geojson"!==e.type?{compatible:!1,warning:"Shape channel should be used with nominal data or geojson only"}:N;case"order":return"nominal"===e.type?{compatible:!1,warning:"Channel order is inappropriate for nominal field, which has no inherent order."}:N}throw new Error("channelCompatability not implemented for channel "+t)}n.channelCompatibility=T,n.isNumberFieldDef=function(e){return"quantitative"===e.type||!!e.bin},n.isTimeFieldDef=function(e){return"temporal"===e.type||!!e.timeUnit}},{"./aggregate":12,"./bin":14,"./channel":15,"./log":110,"./timeunit":120,"./type":124,"./util":125,"vega-util":10}],107:[function(e,t,n){"use strict";Object.defineProperty(n,"__esModule",{value:!0}),n.VL_ONLY_GUIDE_CONFIG=["shortTimeLabels"]},{}],108:[function(e,t,n){"use strict";Object.defineProperty(n,"__esModule",{value:!0}),n.aggregate=e("./aggregate"),n.axis=e("./axis"),n.bin=e("./bin"),n.channel=e("./channel"),n.compositeMark=e("./compositemark");var i=e("./compile/compile");n.compile=i.compile,n.config=e("./config"),n.data=e("./data"),n.datetime=e("./datetime"),n.encoding=e("./encoding"),n.facet=e("./facet"),n.fieldDef=e("./fielddef"),n.legend=e("./legend"),n.mark=e("./mark"),n.scale=e("./scale"),n.sort=e("./sort"),n.spec=e("./spec"),n.stack=e("./stack"),n.timeUnit=e("./timeunit"),n.transform=e("./transform"),n.type=e("./type"),n.util=e("./util"),n.validate=e("./validate"),n.version=e("../package.json").version},{"../package.json":11,"./aggregate":12,"./axis":13,"./bin":14,"./channel":15,"./compile/compile":25,"./compositemark":100,"./config":101,"./data":102,"./datetime":103,"./encoding":104,"./facet":105,"./fielddef":106,"./legend":109,"./mark":112,"./scale":115,"./sort":117,"./spec":118,"./stack":119,"./timeunit":120,"./transform":123,"./type":124,"./util":125,"./validate":126}],109:[function(e,t,n){"use strict";var i=this&&this.__assign||Object.assign||function(e){for(var t,n=1,i=arguments.length;n<i;n++)for(var r in 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transform is not supported for \'+e+" marks."},i.selectionNotFound=function(e){return\'Cannot find a selection named "\'+e+\'"\'},i.SCALE_BINDINGS_CONTINUOUS="Scale bindings are currently only supported for scales with unbinned, continuous domains.",i.noSuchRepeatedValue=function(e){return\'Unknown repeated value "\'+e+\'".\'},i.CONCAT_CANNOT_SHARE_AXIS="Axes cannot be shared in concatenated views.",i.REPEAT_CANNOT_SHARE_AXIS="Axes cannot be shared in repeated views.",i.cannotSetTitleAnchor=function(e){return\'Cannot set title "anchor" for a \'+e+" spec"},i.unrecognizedParse=function(e){return\'Unrecognized parse "\'+e+\'".\'},i.differentParse=function(e,t,n){return\'An ancestor parsed field "\'+e+\'" as \'+n+" but a child wants to parse the field as "+t+"."},i.invalidTransformIgnored=function(e){return"Ignoring an invalid transform: "+o.stringify(e)+"."},i.NO_FIELDS_NEEDS_AS=\'If "from.fields" is not specified, "as" has to be a string that specifies the key to be used for the the data 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Converted to {value: "+o.stringify(n)+"}."},i.invalidFieldType=function(e){return\'Invalid field type "\'+e+\'"\'},i.invalidFieldTypeForCountAggregate=function(e,t){return\'Invalid field type "\'+e+\'" for aggregate: "\'+t+\'", using "quantitative" instead.\'},i.invalidAggregate=function(e){return\'Invalid aggregation operator "\'+e+\'"\'},i.emptyOrInvalidFieldType=function(e,t,n){return\'Invalid field type "\'+e+\'" for channel "\'+t+\'", using "\'+n+\'" instead.\'},i.emptyFieldDef=function(e,t){return"Dropping "+o.stringify(e)+\' from channel "\'+t+\'" since it does not contain data field or value.\'},i.latLongDeprecated=function(e,t,n){return e+"-encoding with type "+t+" is deprecated. Replacing with "+n+"-encoding."},i.incompatibleChannel=function(e,t,n){return e+\' dropped as it is incompatible with "\'+t+\'"\'+(n?" when "+n:"")+"."},i.invalidEncodingChannel=function(e){return e+"-encoding is dropped as "+e+" is not a valid encoding channel."},i.facetChannelShouldBeDiscrete=function(e){return e+" encoding should be discrete (ordinal / nominal / binned)."},i.discreteChannelCannotEncode=function(e,t){return\'Using discrete channel "\'+e+\'" to encode "\'+t+\'" field can be misleading as it does not encode \'+("ordinal"===t?"order":"magnitude")+"."},i.BAR_WITH_POINT_SCALE_AND_RANGESTEP_NULL="Bar mark should not be used with point scale when rangeStep is null. Please use band scale instead.",i.unclearOrientContinuous=function(e){return\'Cannot clearly determine orientation for "\'+e+\'" since both x and y channel encode continuous fields. In this case, we use vertical by default\'},i.unclearOrientDiscreteOrEmpty=function(e){return\'Cannot clearly determine orientation for "\'+e+\'" since both x and y channel encode discrete or empty fields.\'},i.orientOverridden=function(e,t){return\'Specified orient "\'+e+\'" overridden with "\'+t+\'"\'},i.CANNOT_UNION_CUSTOM_DOMAIN_WITH_FIELD_DOMAIN="custom domain scale cannot be unioned with default field-based domain",i.cannotUseScalePropertyWithNonColor=function(e){return\'Cannot use the scale property "\'+e+\'" with non-color channel.\'},i.unaggregateDomainHasNoEffectForRawField=function(e){return"Using unaggregated domain with raw field has no effect ("+o.stringify(e)+")."},i.unaggregateDomainWithNonSharedDomainOp=function(e){return\'Unaggregated domain not applicable for "\'+e+\'" since it produces values outside the origin domain of the source data.\'},i.unaggregatedDomainWithLogScale=function(e){return"Unaggregated domain is currently unsupported for log scale ("+o.stringify(e)+")."},i.cannotUseSizeFieldWithBandSize=function(e){return"Using size field when "+e+"-channel has a band scale is not supported."},i.cannotApplySizeToNonOrientedMark=function(e){return\'Cannot apply size to non-oriented mark "\'+e+\'".\'},i.rangeStepDropped=function(e){return\'rangeStep for "\'+e+\'" is dropped as top-level \'+("x"===e?"width":"height")+" is provided."},i.scaleTypeNotWorkWithChannel=function(e,t,n){return\'Channel "\'+e+\'" does not work with "\'+t+\'" scale. We are using "\'+n+\'" scale instead.\'},i.scaleTypeNotWorkWithFieldDef=function(e,t){return\'FieldDef does not work with "\'+e+\'" scale. We are using "\'+t+\'" scale instead.\'},i.scalePropertyNotWorkWithScaleType=function(e,t,n){return n+"-scale\'s \\""+t+\'" is dropped as it does not work with \'+e+" scale."},i.scaleTypeNotWorkWithMark=function(e,t){return\'Scale type "\'+t+\'" does not work with mark "\'+e+\'".\'},i.mergeConflictingProperty=function(e,t,n,i){return"Conflicting "+t+\' property "\'+e+\'" (\'+o.stringify(n)+" and "+o.stringify(i)+").  Using "+o.stringify(n)+"."},i.independentScaleMeansIndependentGuide=function(e){return\'Setting the scale to be independent for "\'+e+\'" means we also have to set the guide (axis or legend) to be independent.\'},i.conflictedDomain=function(e){return"Cannot set "+e+\'-scale\\\'s "domain" as it is binned. Please use "bin"\\\'s "extent" instead.\'},i.domainSortDropped=function(e){return"Dropping sort property "+o.stringify(e)+" as unioned domains only support boolean or op \'count\'."},i.UNABLE_TO_MERGE_DOMAINS="Unable to merge domains",i.MORE_THAN_ONE_SORT="Domains that should be unioned has conflicting sort properties. Sort will be set to true.",i.INVALID_CHANNEL_FOR_AXIS="Invalid channel for axis.",i.cannotStackRangedMark=function(e){return\'Cannot stack "\'+e+\'" if there is already "\'+e+\'2"\'},i.cannotStackNonLinearScale=function(e){return"Cannot stack non-linear scale ("+e+")"},i.stackNonSummativeAggregate=function(e){return\'Stacking is applied even though the aggregate function is non-summative ("\'+e+\'")\'},i.invalidTimeUnit=function(e,t){return"Invalid "+e+": "+o.stringify(t)},i.dayReplacedWithDate=function(e){return\'Time unit "\'+e+\'" is not supported. We are replacing it with \'+e.replace("day","date")+"."},i.droppedDay=function(e){return"Dropping day from datetime "+o.stringify(e)+" as day cannot be combined with other units."}},{"./util":125,"vega-util":10}],111:[function(e,t,n){"use strict";function s(e){return!!e.or}function l(e){return!!e.and}function c(e){return!!e.not}Object.defineProperty(n,"__esModule",{value:!0}),n.isLogicalOr=s,n.isLogicalAnd=l,n.isLogicalNot=c,n.forEachLeave=function e(t,n){if(c(t))e(t.not,n);else if(l(t))for(var i=0,r=t.and;i<r.length;i++)e(r[i],n);else if(s(t))for(var o=0,a=t.or;o<a.length;o++)e(a[o],n);else n(t)},n.normalizeLogicalOperand=function t(e,n){return c(e)?{not:t(e.not,n)}:l(e)?{and:e.and.map(function(e){return t(e,n)})}:s(e)?{or:e.or.map(function(e){return t(e,n)})}:n(e)}},{}],112:[function(e,t,n){"use strict";Object.defineProperty(n,"__esModule",{value:!0});var 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e)Object.prototype.hasOwnProperty.call(e,i)&&t.indexOf(i)<0&&(n[i]=e[i]);if(null!=e&&"function"==typeof Object.getOwnPropertySymbols){var r=0;for(i=Object.getOwnPropertySymbols(e);r<i.length;r++)t.indexOf(i[r])<0&&(n[i[r]]=e[i[r]])}return n};Object.defineProperty(n,"__esModule",{value:!0});var r,o=e("vega-util"),a=e("./channel"),s=e("./log"),l=e("./util");(r=n.ScaleType||(n.ScaleType={})).LINEAR="linear",r.BIN_LINEAR="bin-linear",r.LOG="log",r.POW="pow",r.SQRT="sqrt",r.TIME="time",r.UTC="utc",r.SEQUENTIAL="sequential",r.QUANTILE="quantile",r.QUANTIZE="quantize",r.THRESHOLD="threshold",r.ORDINAL="ordinal",r.BIN_ORDINAL="bin-ordinal",r.POINT="point",r.BAND="band";var c={linear:"numeric",log:"numeric",pow:"numeric",sqrt:"numeric","bin-linear":"bin-linear",time:"time",utc:"time",sequential:"sequential",ordinal:"ordinal","bin-ordinal":"bin-ordinal",point:"ordinal-position",band:"ordinal-position"};n.SCALE_TYPES=l.keys(c),n.scaleCompatible=function(e,t){var n=c[e],i=c[t];return n===i||"ordinal-position"===n&&"time"===i||"ordinal-position"===i&&"time"===n};var u={linear:0,log:1,pow:1,sqrt:1,time:0,utc:0,point:10,band:11,"bin-linear":0,sequential:0,ordinal:0,"bin-ordinal":0};n.scaleTypePrecedence=function(e){return u[e]},n.CONTINUOUS_TO_CONTINUOUS_SCALES=["linear","bin-linear","log","pow","sqrt","time","utc"];var f=o.toSet(n.CONTINUOUS_TO_CONTINUOUS_SCALES);n.CONTINUOUS_DOMAIN_SCALES=n.CONTINUOUS_TO_CONTINUOUS_SCALES.concat(["sequential"]);var d=o.toSet(n.CONTINUOUS_DOMAIN_SCALES);n.DISCRETE_DOMAIN_SCALES=["ordinal","bin-ordinal","point","band"];var p=o.toSet(n.DISCRETE_DOMAIN_SCALES),g=o.toSet(["bin-linear","bin-ordinal"]);function m(e){return e in d}function h(e){return e in f}n.TIME_SCALE_TYPES=["time","utc"],n.hasDiscreteDomain=function(e){return e in p},n.isBinScale=function(e){return e in 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  if __name__ == "__main__":
      argumentparser = argparse.ArgumentParser(description="VegaScope can be used within Python (import vegascope) or a shell command.")
      argumentparser.add_argument("FILE", nargs="?", default="-", help="file to watch for changes; default is '-' for lines on stdin (stdin requires one JSON object per line)")
      argumentparser.add_argument("-w", "--wait", type=float, default="0.1", help="poll wait time in seconds; default is 0.1 (100 ms); not applicable to stdin")
      argumentparser.add_argument("-t", "--type", default="LocalCanvas", choices=["Canvas", "LocalCanvas", "TunnelCanvas"], help="type of Canvas; default is LocalCanvas")
      argumentparser.add_argument("-T", "--title", default=None, help="browser window title and saved file name prefix")
      argumentparser.add_argument("-b", "--host", default="0.0.0.0", help="host name to bind to; default is 0.0.0.0 for any address (not applicable to LocalCanvas or TunnelVanvas)")
      argumentparser.add_argument("-p", "--port", type=int, default=0, help="port to bind to; default is 0 for any open port")
      argumentparser.add_argument("-q", "--no-verbose", action="store_true", default=False, help="if supplied, do not log output to stdout (opposite of verbose)")
      argumentparser.add_argument("-Q", "--no-newtab", action="store_true", default=False, help="if supplied, do not open a browser window (opposite of newtab, only applicable to LocalCanvas)")
  
      args = argumentparser.parse_args()
  
      if args.type == "Canvas":
          canvas = Canvas(title=args.title, host=args.host, port=args.port, verbose=args.verbose)
      elif args.type == "LocalCanvas":
          canvas = LocalCanvas(title=args.title, port=args.port, verbose=(not args.no_verbose), newtab=(not args.no_newtab))
      elif args.type == "TunnelCanvas":
          canvas = TunnelCanvas(title=args.title, port=args.port, verbose=(not args.no_verbose))
      else:
          raise AssertionError(args.type)
  
      if not args.no_verbose:
          canvas.how()
  
      if args.FILE == "-":
          while True:
              line = sys.stdin.readline()
              try:
                  canvas(json.loads(line))
              except Exception as err:
                  sys.stderr.write(str(err))
  
      else:
          lasttime = None
          while True:
              if os.path.exists(args.FILE) and os.stat(args.FILE).st_mtime != lasttime:
                  lasttime = os.stat(args.FILE).st_mtime
                  try:
                      canvas(json.load(open(args.FILE)))
                  except Exception as err:
                      sys.stderr.write(str(err))
              time.sleep(args.wait)
  