/// <summary>
/// forms a string containing text of a given word fragment and
/// information about which lines the fragment occupies in the text
/// </summary>
/// <param name="lines">text split into lines containing the fragment</param>
/// <param name="fragment">word fragment to take information from (start position,
/// end position)</param>
/// <returns>a new string with the word fragment content and information</returns>
static string FormFragmentString(string[] lines, WordFragment fragment)
{
StringBuilder builder = new StringBuilder();
for (int i = fragment.StartLine; i <= fragment.EndLine; i++)
{
if (i == fragment.StartLine)
{
if (fragment.StartLine == fragment.EndLine)
{
builder.Append(lines[i].Substring(fragment.StartIndex, fragment.Length));
}
else
{
builder.Append(lines[i].Substring(fragment.StartIndex));
}
}
else if (i == fragment.EndLine)
{
builder.Append(lines[i].Substring(0, fragment.EndIndex + 1));
}
else
{
builder.Append(lines[i]);
}
builder.AppendLine();
}
builder.Append(string.Format("Fragmentas yra eilutėse {0} - {1}.",
fragment.StartLine + 1, fragment.EndLine + 1));
builder.AppendLine();
return(builder.ToString());
}
/// <summary>
/// calculates the length (in characters) of word fragment
/// </summary>
/// <param name="lines">lines of text containing the fragment (only used if the
/// fragment occupies more than one two lines)</param>
/// <param name="fragment">word fragment to calculate length of</param>
static void CalculateFragmentLength(string[] lines, WordFragment fragment)
{
for (int i = fragment.StartLine; i <= fragment.EndLine; i++)
{
if (i == fragment.StartLine)
{
if (fragment.StartLine == fragment.EndLine)
{
fragment.Length += fragment.EndIndex - fragment.StartIndex + 1;
}
else
{
fragment.Length += lines[i].Length - fragment.StartIndex;
}
}
else if (i == fragment.EndLine)
{
fragment.Length += fragment.EndIndex + 1;
}
else
{
fragment.Length += lines[i].Length;
}
}
}
/// <summary>
/// find all word fragments, where the last word character
/// matches the first character of the next word, in the text
/// </summary>
/// <param name="lines">text split into lines</param>
/// <param name="words">all words of the text</param>
/// <returns>List containing all word fragments</returns>
static List <WordFragment> FindAllWordFragments(string[] lines, List <Word> words)
{
List <WordFragment> fragments = new List <WordFragment>();
bool inFragment = false;
WordFragment fragment = null;
Word lastWord = words[0];
for (int i = 1; i < words.Count; i++)
{
Word word = words[i];
if (!inFragment && Char.ToLower(lastWord.LastCharacter) == Char.ToLower(word.FirstCharacter))
{
inFragment = true;
fragment = new WordFragment(lastWord.Line, lastWord.StartIndex);
}
if (inFragment && Char.ToLower(lastWord.LastCharacter) != Char.ToLower(word.FirstCharacter))
{
inFragment = false;
CompleteFragmentAndAddToList(fragments, fragment, lastWord.Line, lastWord.EndIndex, lines);
}
else if (inFragment && i == words.Count - 1)
{
inFragment = false;
CompleteFragmentAndAddToList(fragments, fragment, word.Line, word.EndIndex, lines);
}
lastWord = word;
}
return(fragments);
}
/// <summary>
/// completes (fills with correct information)
/// a WordFragment object and adds it to a list containing all fragments
/// </summary>
/// <param name="fragments">list to store the fragment in</param>
/// <param name="fragment">word fragment to be completed</param>
/// <param name="endLine">ending line of the fragment</param>
/// <param name="endIndex">ending index of the fragment</param>
/// <param name="lines">text containing the fragment split into lines</param>
static void CompleteFragmentAndAddToList(List <WordFragment> fragments, WordFragment fragment,
int endLine, int endIndex, string[] lines)
{
fragment.EndLine = endLine;
fragment.EndIndex = endIndex;
CalculateFragmentLength(lines, fragment);
fragments.Add(fragment);
}
/// <summary>
/// sorts word fragments by length in descending order
/// </summary>
/// <param name="fragments">list of fragments to sort</param>
static void SortWordFragments(List <WordFragment> fragments)
{
for (int i = 0; i < fragments.Count - 1; i++)
{
for (int j = i + 1; j < fragments.Count; j++)
{
if (fragments[j] > fragments[i])
{
WordFragment temp = fragments[i];
fragments[i] = fragments[j];
fragments[j] = temp;
}
}
}
}
/// <summary>
/// removes all fragments from a list, except the ones with the highest length
/// </summary>
/// <param name="fragments">list to remove fragments from</param>
static void KeepOnlyLongestFragments(List <WordFragment> fragments)
{
if (fragments.Count == 0)
{
return;
}
WordFragment longestFragment = fragments[0];
for (int i = 1; i < fragments.Count; i++)
{
if (fragments[i].Length < longestFragment.Length)
{
fragments.RemoveAt(i--);
}
}
}
