private static IEnumerable <TagsPair> GetAllInvalidTagsPair(TagsPair currentPair, IReadOnlyCollection <TagsPair> previousPairs,
IReadOnlyCollection <TagSpecification> currentSpecifications)
{
var specificationForCurrentPairType = currentSpecifications.First(t => t.TagType == currentPair.PairType);
return(previousPairs.Where(pair => pair.EndPosition > currentPair.StartPosition).Where(tagPair => specificationForCurrentPairType.IgnoreTags.Contains(tagPair.PairType)).ToList());
}
private static List <TagsPair> GetTagsPair(Queue <Tag> characterSequences, IReadOnlyCollection <TagSpecification> currentSpecifications, IReadOnlyCollection <TagType> tagsByLine)
{
var previousPairs = new List <TagsPair>();
var openingTags = new List <Tag>();
var tagsPairAfterBlockingTags = new List <TagsPair>();
while (characterSequences.Count > 0)
{
var currentTag = characterSequences.Dequeue();
if (currentTag.TagType == TagType.EndLine && TryGetLastLineOpenTag(openingTags, tagsByLine, currentTag, out var newTag))
{
currentTag = newTag;
}
var startTag = openingTags.FindLast(t => t.TagType == currentTag.TagType);
if (CurrentTagCannotCreatePair(startTag, currentTag))
{
if (currentTag.PositionType != PositionType.ClosingTag)
{
openingTags.Add(new Tag(currentTag.TagType, currentTag.PositionInText, PositionType.OpeningTag, currentTag.Value));
}
continue;
}
var currentPair = new TagsPair(currentTag.TagType, startTag, currentTag);
openingTags.Remove(startTag);
foreach (var invalidOpeningTags in GetAllInvalidOpeningTag(currentPair, openingTags, currentSpecifications))
{
openingTags.Remove(invalidOpeningTags);
}
foreach (var invalidTagsPair in GetAllInvalidTagsPair(currentPair, tagsPairAfterBlockingTags, currentSpecifications))
{
tagsPairAfterBlockingTags.Remove(invalidTagsPair);
if (invalidTagsPair.StartPosition > currentPair.StartPosition)
{
continue;
}
InsertOpeningTags(openingTags, invalidTagsPair.StartTag);
}
if (CanRemoveCurrentPairInTheFuture(openingTags, currentSpecifications, currentPair.PairType))
{
tagsPairAfterBlockingTags.Add(currentPair);
}
else
{
previousPairs.Add(currentPair);
}
}
previousPairs.AddRange(tagsPairAfterBlockingTags);
return(previousPairs);
}
private static IEnumerable <Tag> GetAllInvalidOpeningTag(TagsPair currentPair, IReadOnlyCollection <Tag> previousOpeningTags, IReadOnlyCollection <TagSpecification> currentSpecifications)
{
var specificationForCurrentPairType = currentSpecifications.First(t => t.TagType == currentPair.PairType);
return(previousOpeningTags.Where(tag => tag.PositionInText > currentPair.StartPosition).Where(tag => specificationForCurrentPairType.IgnoreTags.Contains(tag.TagType)).ToList());
}