// CodeMirror, copyright (c) by Marijn Haverbeke and others

// Distributed under an MIT license: https://codemirror.net/LICENSE



(function(mod) {

  if (typeof exports == "object" && typeof module == "object") // CommonJS

    mod(require("../../lib/codemirror"));

  else if (typeof define == "function" && define.amd) // AMD

    define(["../../lib/codemirror"], mod);

  else // Plain browser env

    mod(CodeMirror);

})(function(CodeMirror) {

  "use strict";



  CodeMirror.defineOption("rulers", false, function(cm, val) {

    if (cm.state.rulerDiv) {

      cm.state.rulerDiv.parentElement.removeChild(cm.state.rulerDiv)

      cm.state.rulerDiv = null

      cm.off("refresh", drawRulers)

    }

    if (val && val.length) {

      cm.state.rulerDiv = cm.display.lineSpace.parentElement.insertBefore(document.createElement("div"), cm.display.lineSpace)

      cm.state.rulerDiv.className = "CodeMirror-rulers"

      drawRulers(cm)

      cm.on("refresh", drawRulers)

    }

  });



  function drawRulers(cm) {

    cm.state.rulerDiv.textContent = ""

    var val = cm.getOption("rulers");

    var cw = cm.defaultCharWidth();

    var left = cm.charCoords(CodeMirror.Pos(cm.firstLine(), 0), "div").left;

    cm.state.rulerDiv.style.minHeight = (cm.display.scroller.offsetHeight + 30) + "px";

    for (var i = 0; i < val.length; i++) {

      var elt = document.createElement("div");

      elt.className = "CodeMirror-ruler";

      var col, conf = val[i];

      if (typeof conf == "number") {

        col = conf;

      } else {

        col = conf.column;

        if (conf.className) elt.className += " " + conf.className;

        if (conf.color) elt.style.borderColor = conf.color;

        if (conf.lineStyle) elt.style.borderLeftStyle = conf.lineStyle;

        if (conf.width) elt.style.borderLeftWidth = conf.width;

      }

      elt.style.left = (left + col * cw) + "px";

      cm.state.rulerDiv.appendChild(elt)

    }

  }

});

