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  }

  function annotationTooltip(ann) {
    var severity = ann.severity;
    if (!SEVERITIES.test(severity)) severity = "error";
    var tip = document.createElement("div");
    tip.className = "CodeMirror-lint-message-" + severity;
    tip.appendChild(document.createTextNode(ann.message));
    return tip;
  }

  function startLinting(cm) {
    var state = cm.state.lint, options = state.options;
    if (options.async)
      options.getAnnotations(cm, updateLinting, options);
    else
      updateLinting(cm, options.getAnnotations(cm.getValue(), options.options));
  }

  function updateLinting(cm, annotationsNotSorted) {
    clearMarks(cm);
    var state = cm.state.lint, options = state.options;

    var annotations = groupByLine(annotationsNotSorted);

    for (var line = 0; line < annotations.length; ++line) {
      var anns = annotations[line];
      if (!anns) continue;

      var maxSeverity = null;
      var tipLabel = state.hasGutter && document.createDocumentFragment();

      for (var i = 0; i < anns.length; ++i) {
        var ann = anns[i];
        var severity = ann.severity;
        if (!SEVERITIES.test(severity)) severity = "error";
        maxSeverity = getMaxSeverity(maxSeverity, severity);

        if (options.formatAnnotation) ann = options.formatAnnotation(ann);
        if (state.hasGutter) tipLabel.appendChild(annotationTooltip(ann));

        if (ann.to) state.marked.push(cm.markText(ann.from, ann.to, {
          className: "CodeMirror-lint-mark-" + severity,
          __annotation: ann
        }));
      }

      if (state.hasGutter)
        cm.setGutterMarker(line, GUTTER_ID, makeMarker(tipLabel, maxSeverity, anns.length > 1,
                                                       state.options.tooltips));
    }
    if (options.onUpdateLinting) options.onUpdateLinting(annotationsNotSorted, annotations, cm);
  }

  function onChange(cm) {
    var state = cm.state.lint;
    clearTimeout(state.timeout);
    state.timeout = setTimeout(function(){startLinting(cm);}, state.options.delay || 500);
  }

  function popupSpanTooltip(ann, e) {
    var target = e.target || e.srcElement;
    showTooltipFor(e, annotationTooltip(ann), target);
  }

  // When the mouseover fires, the cursor might not actually be over
  // the character itself yet. These pairs of x,y offsets are used to
  // probe a few nearby points when no suitable marked range is found.
  var nearby = [0, 0, 0, 5, 0, -5, 5, 0, -5, 0];

  function onMouseOver(cm, e) {
    if (!/\bCodeMirror-lint-mark-/.test((e.target || e.srcElement).className)) return;
    for (var i = 0; i < nearby.length; i += 2) {
      var spans = cm.findMarksAt(cm.coordsChar({left: e.clientX + nearby[i],
                                                top: e.clientY + nearby[i + 1]}, "client"));
      for (var j = 0; j < spans.length; ++j) {
        var span = spans[j], ann = span.__annotation;
        if (ann) return popupSpanTooltip(ann, e);
      }
    }
  }

  CodeMirror.defineOption("lint", false, function(cm, val, old) {
    if (old && old != CodeMirror.Init) {
      clearMarks(cm);
      cm.off("change", onChange);
      CodeMirror.off(cm.getWrapperElement(), "mouseover", cm.state.lint.onMouseOver);
      delete cm.state.lint;
    }

    if (val) {
      var gutters = cm.getOption("gutters"), hasLintGutter = false;
      for (var i = 0; i < gutters.length; ++i) if (gutters[i] == GUTTER_ID) hasLintGutter = true;
      var state = cm.state.lint = new LintState(cm, parseOptions(cm, val), hasLintGutter);
      cm.on("change", onChange);
      if (state.options.tooltips != false)
        CodeMirror.on(cm.getWrapperElement(), "mouseover", state.onMouseOver);

      startLinting(cm);
    }
  });
});