private void InitializeUniquePart(int lastUniqueWordIndex, bool fullParentMatched)
{
this.lastUniqueWord = ((lastUniqueWordIndex < this.childBodyFragment.EndWordIndex) ? lastUniqueWordIndex : (this.childBodyFragment.EndWordIndex - 1));
int lastNormalFragmentIndex = BodyDiffer.GetLastNormalFragmentIndex(this.childBodyFragment, lastUniqueWordIndex);
int num = (this.ChildScanner.Fragments.Count > lastNormalFragmentIndex + 1) ? ((int)this.ChildScanner.Fragments[lastNormalFragmentIndex + 1].FirstLine) : this.childBodyFragment.EndLineIndex;
num = ((num >= this.childBodyFragment.EndLineIndex) ? this.childBodyFragment.EndLineIndex : num);
int startLineIndex = this.childBodyFragment.StartLineIndex;
FragmentInfo.TrimBoundary(this.ChildScanner, ref startLineIndex, ref num);
if (fullParentMatched)
{
for (int i = this.childBodyFragment.StartLineIndex; i < num; i++)
{
if ((ulong)this.ChildScanner.Lines[i].FirstWordIndex > (ulong)((long)this.lastUniqueWord))
{
num = i;
FragmentInfo.TrimBoundary(this.ChildScanner, ref startLineIndex, ref num);
if (num > 0 && this.ChildScanner.Lines[num - 1].Category == ConversationBodyScanner.Scanner.LineCategory.PotentialNonMsHeader)
{
num--;
}
}
}
}
this.uniqueBodyPart = new FragmentInfo(this.ChildScanner, startLineIndex, num);
}
private bool MatchWordWithHref(int iChildWordIndex, int iParentWordIndex)
{
TextRun textRun = this.ChildScanner.Words[iChildWordIndex];
TextRun right = this.ParentScanner.Words[iParentWordIndex];
int num;
int num2;
return(BodyDiffer.GetHrefTagIndex(textRun, out num, out num2) && BodyDiffer.IsSameWord(textRun, right, 0, num, 0, num) && BodyDiffer.IsSameWord(textRun, right, num2 + 1, textRun.WordLength, num, right.WordLength));
}
private void WordByWordDiff()
{
if (this.parentBodyFragment.StartWordIndex == this.parentBodyFragment.EndWordIndex)
{
this.uniqueBodyPart = this.childBodyFragment.Trim();
return;
}
if (this.childBodyFragment.IsEmpty)
{
return;
}
int lastNormalFragmentIndex = BodyDiffer.GetLastNormalFragmentIndex(this.parentBodyFragment, this.parentBodyFragment.EndWordIndex);
int lastNormalFragmentIndex2 = BodyDiffer.GetLastNormalFragmentIndex(this.childBodyFragment, this.childBodyFragment.EndWordIndex);
int num = this.childBodyFragment.StartWordIndex;
int num2 = this.parentBodyFragment.StartWordIndex;
int disclaimerWordStart = this.childBodyFragment.EndWordIndex;
if (lastNormalFragmentIndex < this.ParentScanner.Fragments.Count && lastNormalFragmentIndex2 < this.ChildScanner.Fragments.Count && this.ParentScanner.Fragments[lastNormalFragmentIndex].FirstWord < this.parentBodyFragment.EndWordIndex && this.ChildScanner.Fragments[lastNormalFragmentIndex2].FirstWord < this.childBodyFragment.EndWordIndex)
{
num = this.ChildScanner.Fragments[lastNormalFragmentIndex2].FirstWord;
num2 = this.ParentScanner.Fragments[lastNormalFragmentIndex].FirstWord;
while (num < this.childBodyFragment.EndWordIndex && num2 < this.parentBodyFragment.EndWordIndex && this.MatchWord(ref num, ref num2, true, 0))
{
num++;
num2++;
}
}
if (num2 != this.parentBodyFragment.EndWordIndex)
{
num = this.childBodyFragment.EndWordIndex - 1;
num2 = this.parentBodyFragment.EndWordIndex - 1;
}
else
{
disclaimerWordStart = num;
num = this.ChildScanner.Fragments[lastNormalFragmentIndex2].FirstWord - 1;
num2 = this.ParentScanner.Fragments[lastNormalFragmentIndex].FirstWord - 1;
}
while (num >= this.childBodyFragment.StartWordIndex && num2 >= this.parentBodyFragment.StartWordIndex && this.MatchWord(ref num, ref num2, false, 0))
{
num--;
num2--;
}
this.InitializeUniquePart(num, num2 < 0);
this.InitializeDisclaimerPart(disclaimerWordStart);
if (this.uniqueBodyPart.IsEmpty && !this.disclaimerPart.IsEmpty)
{
this.uniqueBodyPart = this.disclaimerPart;
this.disclaimerPart = FragmentInfo.Empty;
}
}
private static bool IsSameWord(TextRun left, TextRun right, int leftBegin, int leftEnd, int rightBegin, int rightEnd)
{
if (leftEnd - leftBegin != rightEnd - rightBegin)
{
return(false);
}
if (leftEnd <= left.WordLength && rightEnd <= right.WordLength)
{
while (leftBegin < leftEnd && rightBegin < rightEnd)
{
if (!BodyDiffer.IsSameChar(left.GetWordChar(leftBegin), right.GetWordChar(rightBegin)))
{
return(false);
}
leftBegin++;
rightBegin++;
}
return(true);
}
return(false);
}
private static bool IsSameWord(TextRun left, TextRun right)
{
return(BodyDiffer.IsSameWord(left, right, 0, left.WordLength, 0, right.WordLength));
}
private bool MatchWord(ref int childWordIndex, ref int parentWordIndex, bool forwardMatch, int recursionLevel)
{
int num = forwardMatch ? 1 : -1;
if (recursionLevel > 5)
{
return(false);
}
if (childWordIndex >= this.childBodyFragment.EndWordIndex || parentWordIndex >= this.parentBodyFragment.EndWordIndex || childWordIndex < 0 || parentWordIndex < 0)
{
return(false);
}
if (BodyDiffer.IsSameWord(this.ParentScanner.Words[parentWordIndex], this.ChildScanner.Words[childWordIndex]))
{
return(true);
}
int num5;
int num6;
if (this.IsHrefBeginText(childWordIndex, forwardMatch))
{
int num2 = this.HrefTextEndIndex(childWordIndex, forwardMatch);
if (this.MatchWord(ref num2, ref parentWordIndex, forwardMatch, recursionLevel + 1))
{
childWordIndex = num2;
return(true);
}
}
else if (this.IsHorizontalLine(this.ChildScanner.Words[childWordIndex]))
{
int num3 = childWordIndex + num;
if (this.MatchWord(ref num3, ref parentWordIndex, forwardMatch, recursionLevel + 1))
{
childWordIndex = num3;
return(true);
}
}
else if (this.IsHorizontalLine(this.ParentScanner.Words[parentWordIndex]))
{
int num4 = parentWordIndex + num;
if (this.MatchWord(ref childWordIndex, ref num4, forwardMatch, recursionLevel + 1))
{
parentWordIndex = num4;
return(true);
}
}
else if (BodyDiffer.GetHrefTagIndex(this.ChildScanner.Words[childWordIndex], out num5, out num6))
{
if (num5 == 0)
{
int num7 = childWordIndex + num;
if (this.MatchWord(ref num7, ref parentWordIndex, forwardMatch, recursionLevel + 1))
{
childWordIndex = num7;
return(true);
}
}
else if (this.MatchWordWithHref(childWordIndex, parentWordIndex))
{
return(true);
}
}
else if (this.ChildScanner.Words[childWordIndex].WordLength == 1 && this.ChildScanner.Words[childWordIndex].GetWordChar(0) == '>')
{
int num8 = childWordIndex + num;
if (this.MatchWord(ref num8, ref parentWordIndex, forwardMatch, recursionLevel + 1))
{
childWordIndex = num8;
return(true);
}
}
else if (BodyDiffer.IsListNumberOrBullet(this.ChildScanner.Words[childWordIndex]))
{
int num9 = childWordIndex + num;
if (this.MatchWord(ref num9, ref parentWordIndex, forwardMatch, recursionLevel + 1))
{
childWordIndex = num9;
return(true);
}
}
else if (BodyDiffer.IsListNumberOrBullet(this.ParentScanner.Words[parentWordIndex]))
{
int num10 = parentWordIndex + num;
if (this.MatchWord(ref childWordIndex, ref num10, forwardMatch, recursionLevel + 1))
{
parentWordIndex = num10;
return(true);
}
}
return(false);
}