/// <summary>
/// Creates the flat text span list.
/// </summary>
/// <param name="startIndex">The start index.</param>
/// <param name="tokens">The tokens.</param>
/// <returns></returns>
private List<StringSpan> GetFlatSpans(int startIndex, string[] tokens)
{
if ((tokens == null) || (tokens.Length == 0))
throw new ArgumentNullException("tokens");
if (tokens.Length != 2)
throw new ArgumentException("tokens", Local.InvalidArrayLength);
string openToken = tokens[0];
int openTokenLength = openToken.Length;
string closeToken = tokens[1];
int closeTokenLength = closeToken.Length;
//
var stringSpans = new List<StringSpan>();
StringSpan span = null;
int nextStartIndex = startIndex;
int nextEndIndex = -1;
do
{
// locate openning token
int startSpanIndex = _s.IndexOf(openToken, nextStartIndex, StringComparison.OrdinalIgnoreCase);
if (startSpanIndex == -1)
break;
// starting position to search for closing token
if ((nextEndIndex == -1) || (nextEndIndex < startSpanIndex))
nextEndIndex = startSpanIndex;
// locate closing token
int endSpanIndex = _s.IndexOf(closeToken, nextEndIndex, StringComparison.OrdinalIgnoreCase);
if (endSpanIndex == -1)
break;
if (span == null)
// first span
span = new StringSpan(startSpanIndex, endSpanIndex + closeTokenLength - 1);
else if (span.Merge(startSpanIndex, endSpanIndex + closeTokenLength - 1))
{
// overlapping with current span - do nothing
}
else
{
// not-overlapping with current span
stringSpans.MergeAdd(span);
span = new StringSpan(startSpanIndex, endSpanIndex + closeTokenLength - 1);
}
nextStartIndex = startSpanIndex + openTokenLength;
nextEndIndex = endSpanIndex + closeTokenLength;
} while (true);
// append last span, if one exists
if (span != null)
stringSpans.MergeAdd(span);
return stringSpans;
}
/// <summary>
/// Determines whether the specified text span is contain.
/// </summary>
/// <param name="span">The text span.</param>
/// <returns>
/// <c>true</c> if the specified text span is contain; otherwise, <c>false</c>.
/// </returns>
public bool IsContain(StringSpan span)
{
return(IsContain(span.StartIndex, span.EndIndex));
}
/// <summary>
/// Determines whether the specified text span is overlap.
/// </summary>
/// <param name="span">The text span.</param>
/// <returns>
/// <c>true</c> if the specified text span is overlap; otherwise, <c>false</c>.
/// </returns>
public bool IsOverlap(StringSpan span)
{
return(IsOverlap(span.StartIndex, span.EndIndex));
}
/// <summary>
/// Merges the specified text span.
/// </summary>
/// <param name="span">The text span.</param>
/// <returns></returns>
public bool Merge(StringSpan span)
{
return(Merge(span.StartIndex, span.EndIndex));
}
/// <summary>
/// Determines whether the specified text span is overlap.
/// </summary>
/// <param name="span">The text span.</param>
/// <returns>
/// <c>true</c> if the specified text span is overlap; otherwise, <c>false</c>.
/// </returns>
public bool IsOverlap(StringSpan span) { return IsOverlap(span.StartIndex, span.EndIndex); }
/// <summary>
/// Determines whether the specified text span is contain.
/// </summary>
/// <param name="span">The text span.</param>
/// <returns>
/// <c>true</c> if the specified text span is contain; otherwise, <c>false</c>.
/// </returns>
public bool IsContain(StringSpan span) { return IsContain(span.StartIndex, span.EndIndex); }
/// <summary>
/// Merges the specified text span.
/// </summary>
/// <param name="span">The text span.</param>
/// <returns></returns>
public bool Merge(StringSpan span) { return Merge(span.StartIndex, span.EndIndex); }
/// <summary>
/// Creates the flat text span list.
/// </summary>
/// <param name="startIndex">The start index.</param>
/// <param name="tokenArray">The token array.</param>
/// <returns></returns>
private List <StringSpan> GetFlatSpans(int startIndex, string[] tokens)
{
if ((tokens == null) || (tokens.Length == 0))
{
throw new ArgumentNullException("tokens");
}
if (tokens.Length != 2)
{
throw new ArgumentException("tokens", Local.InvalidArrayLength);
}
string openToken = tokens[0];
int openTokenLength = openToken.Length;
string closeToken = tokens[1];
int closeTokenLength = closeToken.Length;
//
var stringSpans = new List <StringSpan>();
StringSpan span = null;
int nextStartIndex = startIndex;
int nextEndIndex = -1;
do
{
// locate openning token
int startSpanIndex = _s.IndexOf(openToken, nextStartIndex, StringComparison.OrdinalIgnoreCase);
if (startSpanIndex == -1)
{
break;
}
// starting position to search for closing token
if ((nextEndIndex == -1) || (nextEndIndex < startSpanIndex))
{
nextEndIndex = startSpanIndex;
}
// locate closing token
int endSpanIndex = _s.IndexOf(closeToken, nextEndIndex, StringComparison.OrdinalIgnoreCase);
if (endSpanIndex == -1)
{
break;
}
if (span == null)
{
// first span
span = new StringSpan(startSpanIndex, endSpanIndex + closeTokenLength - 1);
}
else if (span.Merge(startSpanIndex, endSpanIndex + closeTokenLength - 1))
{
// overlapping with current span - do nothing
}
else
{
// not-overlapping with current span
stringSpans.MergeAdd(span);
span = new StringSpan(startSpanIndex, endSpanIndex + closeTokenLength - 1);
}
nextStartIndex = startSpanIndex + openTokenLength;
nextEndIndex = endSpanIndex + closeTokenLength;
} while (true);
// append last span, if one exists
if (span != null)
{
stringSpans.MergeAdd(span);
}
return(stringSpans);
}
