public static bool MatchRightToLeft(VisualElement element, StyleComplexSelector complexSelector, Action <VisualElement, MatchResultInfo> processResult)
{
VisualElement visualElement = element;
int i = complexSelector.selectors.Length - 1;
VisualElement visualElement2 = null;
int num = -1;
bool result;
while (i >= 0)
{
bool flag = visualElement == null;
if (flag)
{
break;
}
MatchResultInfo matchResultInfo = StyleSelectorHelper.MatchesSelector(visualElement, complexSelector.selectors[i]);
processResult(visualElement, matchResultInfo);
bool flag2 = !matchResultInfo.success;
if (flag2)
{
bool flag3 = i < complexSelector.selectors.Length - 1 && complexSelector.selectors[i + 1].previousRelationship == StyleSelectorRelationship.Descendent;
if (flag3)
{
visualElement = visualElement.parent;
}
else
{
bool flag4 = visualElement2 != null;
if (!flag4)
{
break;
}
visualElement = visualElement2;
i = num;
}
}
else
{
bool flag5 = i < complexSelector.selectors.Length - 1 && complexSelector.selectors[i + 1].previousRelationship == StyleSelectorRelationship.Descendent;
if (flag5)
{
visualElement2 = visualElement.parent;
num = i;
}
bool flag6 = --i < 0;
if (flag6)
{
result = true;
return(result);
}
visualElement = visualElement.parent;
}
}
result = false;
return(result);
}
public static bool MatchRightToLeft(VisualElement element, StyleComplexSelector complexSelector, Action <VisualElement, MatchResultInfo> processResult)
{
// see https://speakerdeck.com/constellation/css-jit-just-in-time-compiled-css-selectors-in-webkit for
// a detailed explaination of the algorithm
var current = element;
int nextIndex = complexSelector.selectors.Length - 1;
VisualElement saved = null;
int savedIdx = -1;
// go backward
while (nextIndex >= 0)
{
if (current == null)
{
break;
}
MatchResultInfo matchInfo = MatchesSelector(current, complexSelector.selectors[nextIndex]);
processResult(current, matchInfo);
if (!matchInfo.success)
{
// if we have a descendent relationship, keep trying on the parent
// ie. "div span", div failed on this element, try on the parent
// happens earlier than the backtracking saving below
if (nextIndex < complexSelector.selectors.Length - 1 &&
complexSelector.selectors[nextIndex + 1].previousRelationship == StyleSelectorRelationship.Descendent)
{
current = current.parent;
continue;
}
// otherwise, if there's a previous relationship, it's a 'child' one. backtrack from the saved point and try again
// ie. for "#x > .a .b", #x failed, backtrack to .a on the saved element
if (saved != null)
{
current = saved;
nextIndex = savedIdx;
continue;
}
break;
}
// backtracking save
// for "a > b c": we're considering the b matcher. c's previous relationship is Descendent
// save the current element parent to try to match b again
if (nextIndex < complexSelector.selectors.Length - 1 &&
complexSelector.selectors[nextIndex + 1].previousRelationship == StyleSelectorRelationship.Descendent)
{
saved = current.parent;
savedIdx = nextIndex;
}
// from now, the element is a match
if (--nextIndex < 0)
{
return(true);
}
current = current.parent;
}
return(false);
}