CodeMirror.extendMode('css', {
  commentStart: '/*',
  commentEnd: '*/',
  newlineAfterToken: function (type, content) {
    return /^[;{}]$/.test(content)
  }
})

// Comment/uncomment the specified range
CodeMirror.defineExtension('commentRange', function (isComment, from, to) {
  var cm = this
  var curMode = CodeMirror.innerMode(cm.getMode(), cm.getTokenAt(from).state)
    .mode
  cm.operation(function () {
    if (isComment) {
      // Comment range
      cm.replaceRange(curMode.commentEnd, to)
      cm.replaceRange(curMode.commentStart, from)
      if (from.line == to.line && from.ch == to.ch) {
        // An empty comment inserted - put cursor inside
        cm.setCursor(from.line, from.ch + curMode.commentStart.length)
      }
    } else {
      // Uncomment range
      var selText = cm.getRange(from, to)
      var startIndex = selText.indexOf(curMode.commentStart)
      var endIndex = selText.lastIndexOf(curMode.commentEnd)
      if (startIndex > -1 && endIndex > -1 && endIndex > startIndex) {
        // Take string till comment start
        selText =
            selText.substr(0, startIndex) +
            // From comment start till comment end
            selText.substring(
              startIndex + curMode.commentStart.length,
              endIndex
            ) +
            // From comment end till string end
            selText.substr(endIndex + curMode.commentEnd.length)
      }
      cm.replaceRange(selText, from, to)
    }
  })
})

// Applies automatic mode-aware indentation to the specified range
CodeMirror.defineExtension('autoIndentRange', function (from, to) {
  var cmInstance = this
  this.operation(function () {
    for (var i = from.line; i <= to.line; i++) {
      cmInstance.indentLine(i, 'smart')
    }
  })
})

// Applies automatic formatting to the specified range
CodeMirror.defineExtension('autoFormatRange', function (from, to) {
  var cm = this
  var outer = cm.getMode()
  var text = cm.getRange(from, to).split('\n')
  var state = CodeMirror.copyState(outer, cm.getTokenAt(from).state)
  var tabSize = cm.getOption('tabSize')

  var out = ''
  var lines = 0
  var atSol = from.ch == 0
  function newline () {
    out += '\n'
    atSol = true
    ++lines
  }

  for (var i = 0; i < text.length; ++i) {
    var stream = new CodeMirror.StringStream(text[i], tabSize)
    while (!stream.eol()) {
      var inner = CodeMirror.innerMode(outer, state)
      var style = outer.token(stream, state)
      var cur = stream.current()
      stream.start = stream.pos
      if (!atSol || /\S/.test(cur)) {
        out += cur
        atSol = false
      }
      if (
        !atSol &&
          inner.mode.newlineAfterToken &&
          inner.mode.newlineAfterToken(
            style,
            cur,
            stream.string.slice(stream.pos) || text[i + 1] || '',
            inner.state
          )
      ) {
        newline()
      }
    }
    if (!stream.pos && outer.blankLine) outer.blankLine(state)
    if (!atSol) newline()
  }

  cm.operation(function () {
    cm.replaceRange(out, from, to)
    for (
      var cur = from.line + 1, end = from.line + lines;
      cur <= end;
      ++cur
    ) {
      cm.indentLine(cur, 'smart')
    }
    cm.setSelection(from, cm.getCursor(false))
  })
})