/// <summary>
/// This code was copied from CompletionEngine.cs in the CSS code. If this class gets
/// copied into the CSS code, reuse that other function (CompletionEngine.GetCompletionContextLeafItem)
/// </summary>
private static JSONParseItem GetContextItem(JSONDocument styleSheet, int position)
{
// Look on both sides of the cursor for a context item.
JSONParseItem prevItem = styleSheet.ItemBeforePosition(position) ?? styleSheet;
JSONParseItem nextItem = styleSheet.ItemAfterPosition(position);
if (position > prevItem.AfterEnd)
{
// Not touching the previous item, check its parents
for (; prevItem != null; prevItem = prevItem.Parent)
{
if (prevItem.IsUnclosed || prevItem.AfterEnd >= position)
{
break;
}
}
}
// Only use the next item if the cursor is touching it, and it's not a comment
if (nextItem != null && (position < nextItem.Start))// || nextItem.FindType<Comment>() != null))
{
nextItem = null;
}
// When two things touch the cursor inside of a selector, always prefer the previous item.
// If this logic gets larger, consider a better design to choose between two items.
if (nextItem != null &&
prevItem != null &&
prevItem.AfterEnd == position)
{
nextItem = null;
}
return(nextItem ?? prevItem);
}