public void EmInStrong_Works()
{
var text = "__t_t_t__";
var state = new TextTagsState(text, 2, text.Length - 2);
tagsFinder.GetFirstTagOnSegment(state).Should().Be(new TagSegment(TagName.Em, 3, 5));
}
public TagSegment GetFirstTagOnSegment(TextTagsState state)
{
int? openedIndex, closedIndex;
TagName?tagName;
while (true)
{
openedIndex = GetIndexTagBracket(state, IsOpenedTag, null, false);
if (!openedIndex.HasValue)
{
return(null);
}
state = state.ChangeSegment(openedIndex.Value, state.End);
tagName = GetTagName(state, IsOpenedTag);
var indexInTag = openedIndex.Value + Tags.GetMd(tagName.Value).Length;
if (indexInTag > state.End)
{
return(null);
}
state = state.ChangeSegment(indexInTag, state.End);
closedIndex = GetIndexTagBracket(state, IsClosedTag, tagName, true);
if (!closedIndex.HasValue || IsEmptyInsideTag(closedIndex, openedIndex, tagName))
{
continue;
}
break;
}
return(new TagSegment(tagName.Value, openedIndex.Value, closedIndex.Value));
}
public void InactiveEmInStrongEm()
{
var text = "___a_a_a___";
var state = new TextTagsState(new BitArray(new[] { true, false, false }), text, 3, text.Length - 4);
tagsFinder.GetFirstTagOnSegment(state).Should().BeNull();
}
public void StrongInEm_DoesNotWork()
{
var text = "_t__t__t_";
var state = new TextTagsState(new BitArray(new [] { false, false, true }), text, 1, text.Length - 2);
tagsFinder.GetFirstTagOnSegment(state).Should().Be(null);
}
private IEnumerable <TagSegment> GetAllTags(TextTagsState state)
{
var nextStates = new Stack <TextTagsState>();
for (var index = 0; index < state.Text.Length; index++)
{
var tag = finder.GetFirstTagOnSegment(state);
if (tag == null)
{
if (nextStates.Count == 0)
{
break;
}
index = nextStates.Peek().Start - 1;
state = nextStates.Pop();
continue;
}
yield return(tag);
var newStart = tag.CloseIndex + Tags.GetMd(tag.TagName).Length;
if (newStart < state.End)
{
nextStates.Push(state.ChangeSegment(newStart, state.End));
}
index = tag.OpenIndex + Tags.GetMd(tag.TagName).Length;
if (index <= state.End - 1)
{
state = state.SwitchTag(tag.TagName).ChangeSegment(index, tag.CloseIndex - 1);
}
index -= 1;
}
}
public void FindFirstTag_InBeginingAndOutOfTags(TagName expectedTagName, int expectedX, int expectedY)
{
var md = Tags.GetMd(expectedTagName);
var text = string.Format("{0}t{0}t", md);
var state = new TextTagsState(text, 0, text.Length - 1);
tagsFinder.GetFirstTagOnSegment(state).Should().Be(new TagSegment(expectedTagName, expectedX, expectedY));
}
private TagName?GetTagName(TextTagsState state, Func <TagName, TextTagsState, bool> condition)
{
return(Enum
.GetValues(typeof(TagName))
.Cast <TagName?>()
.FirstOrDefault(tagName =>
condition(tagName.Value, state)));
}
private bool IsClosedTag(TagName tag, TextTagsState state)
{
return(IsItLooksLikeTag(tag, state) &&
state.Start > 0 &&
state.Text[state.Start - 1] != ' ' &&
IsNotPrevSymbolUnderlining(state) &&
!char.IsDigit(state.Text[state.Start - 1]));
}
public void SwitchTag_InverseBitInMask()
{
var expectedState = !textTagsState.IsInTag(TagName.Em);
textTagsState = textTagsState.SwitchTag(TagName.Em);
textTagsState.IsInTag(TagName.Em).Should().Be(expectedState);
}
private bool IsNotPrevSymbolUnderlining(TextTagsState state)
{
return(state.Start == 0 ||
state.Start > 0 &&
(state.Text[state.Start - 1] != '_' ||
state.Start > 1 &&
state.Text[state.Start - 2] == '\\'));
}
private bool IsOpenedTag(TagName tag, TextTagsState state)
{
var indexInTag = state.Start + Tags.GetMd(tag).Length;
return(IsItLooksLikeTag(tag, state) &&
indexInTag - 1 < state.End &&
state.Text[indexInTag] != ' ' &&
IsNotPrevSymbolUnderlining(state) &&
!char.IsDigit(state.Text[indexInTag]));
}
private int?GetIndexTagBracket(
TextTagsState state,
Func <TagName, TextTagsState, bool> condition,
TagName?expectedTagName,
bool isEqual)
{
return(Enumerable
.Range(state.Start, state.End - state.Start + 1)
.Cast <int?>()
.FirstOrDefault(i =>
Equals(GetTagName(state.ChangeSegment(i.Value, state.End), condition), expectedTagName) == isEqual));
}
private bool IsItLooksLikeTag(TagName tag, TextTagsState state)
{
const int moreThanAnyTagLength = 4;
if (state.Start + Tags.GetMd(tag).Length - 1 > state.End || IsDisabledEscape(state))
{
return(false);
}
if (state.Start + moreThanAnyTagLength <= state.End &&
state.Text.Substring(state.Start, moreThanAnyTagLength) == "____")
{
return(false);
}
var potentialTag = state.Text.Substring(state.Start, Tags.GetMd(tag).Length);
return(Tags.GetMd(tag) == potentialTag &&
!state.IsInTag(TagName.Em) &&
!state.IsInTag(TagName.StrongEm));
}
public string RenderToHtml(string markdown)
{
state = new TextTagsState(markdown, 0, markdown.Length - 1);
return(replacer.ReplaceTags(markdown, GetAllTags(state).ToList())); //TODO
}
public void SetUp()
{
textTagsState = new TextTagsState(new BitArray(new[] { false, true, false }), "", 0, 0);
}
private bool IsDisabledEscape(TextTagsState state) => state.Start > 0 && state.Text[state.Start - 1] == '\\';
private void TestGetFirstTagOnSegment(string text, TagSegment expectedTagSegment)
{
var state = new TextTagsState(text, 0, text.Length - 1);
tagsFinder.GetFirstTagOnSegment(state).Should().Be(expectedTagSegment);
}
public TagSegment TagMustClosed(string text)
{
var state = new TextTagsState(text, 0, text.Length - 1);
return(tagsFinder.GetFirstTagOnSegment(state));
}