/// <summary>
/// Debugging: Used to get length distribution to understand string sizes.
/// </summary>
/// <returns></returns>
internal int[] CountByPaddedLength()
{
int maxLength = 0;
Dictionary <int, int> result = new Dictionary <int, int>();
for (int i = 0; i < _sortedExistingValues.Count; ++i)
{
String8 current = _sortedExistingValues[i];
int length = current.Length;
length = length & ~3;
if (length > maxLength)
{
maxLength = length;
}
int count;
if (!result.TryGetValue(length, out count))
{
count = 0;
}
result[length] = count + 1;
}
int[] resultByFourByteLength = new int[maxLength / 4];
for (int i = 0; i < resultByFourByteLength.Length; ++i)
{
int count;
if (!result.TryGetValue(i * 4, out count))
{
count = 0;
}
resultByFourByteLength[i] = count;
}
return(resultByFourByteLength);
}
public int CompareValues(int leftIdentifier, int rightIdentifier)
{
if (leftIdentifier == 0)
{
if (rightIdentifier == 0)
{
// Both empty - equal
return(0);
}
else
{
// Left is before right
return(-1);
}
}
else if (rightIdentifier == 0)
{
// Right is before left
return(1);
}
else if (leftIdentifier < 0 && rightIdentifier < 0)
{
// If both new, compare in AddedValues
return(_addedValues.CompareValues(-leftIdentifier, -rightIdentifier));
}
else if (leftIdentifier >= 0 && rightIdentifier >= 0)
{
// If both existing, compare in ExistingValues
return(_existingValues.CompareValues(leftIdentifier, rightIdentifier));
}
else
{
// Otherwise, get and compare string values for each
String8 left = this[leftIdentifier];
String8 right = this[rightIdentifier];
return(left.CompareTo(right));
}
}
/// <summary>
/// Split a string on a given delimiter into a provided byte[]. Used
/// to split strings without allocation when a large byte[] is created
/// and reused for many strings.
/// </summary>
/// <param name="value">String8 value to split</param>
/// <param name="delimiter">Delimiter to split on</param>
/// <param name="positions">PartialArray<int> to contain split positions</param>
/// <returns>String8Set containing split value</returns>
public static String8Set Split(String8 value, byte delimiter, PartialArray <int> positions)
{
// Ensure the delimiter is single byte
if (delimiter >= 128)
{
throw new ArgumentException(String.Format(Resources.UnableToSupportMultibyteCharacter, delimiter));
}
if (value.IsEmpty())
{
return(String8Set.Empty);
}
// Clear any previous values in the array
positions.Clear();
// Record each delimiter position
positions.Add(0);
// Get the String8 array directly and loop from index to (index + length)
// 3x faster than String8[index].
byte[] array = value._buffer;
int end = value._index + value._length;
for (int i = value._index; i < end; ++i)
{
if (array[i] == delimiter)
{
// Next start position is after this delimiter
positions.Add(i - value._index + 1);
}
}
positions.Add(value.Length + 1);
return(new String8Set(value, 1, positions));
}
/// <summary>
/// Take a case insensitive range and restrict it to the case sensitive subset.
/// This can only be done for Ranges containing different casings of one value.
/// [Ranges from TryFindString, but not TryGetRangeStartingWith]
/// </summary>
/// <param name="r">Range to restrict</param>
/// <param name="value">String8 casing of value to restrict to</param>
/// <returns>Range constrained to subset matching value casing</returns>
private Range MakeCaseSensitive(Range r, String8 value)
{
if (r.IsEmpty())
{
return(r);
}
// Verify this was called only for casing variations [there isn't a single Range for prefixes]
if (this[r.End].Length != value.Length)
{
throw new ArgumentOutOfRangeException();
}
// Exclude values from start which don't match value case-sensitive
int start;
for (start = r.Start; start <= r.End; ++start)
{
if (value.CompareTo(this[start], false) == 0)
{
break;
}
}
// Exclude values from end which don't match value case-sensitive
int end;
for (end = r.End; end > start; --end)
{
if (value.CompareTo(this[end], false) == 0)
{
break;
}
}
return(new Range(start, end));
}
/// <summary>
/// Split a CSV row into cells. This method splits and unencodes quoted values together.
/// It changes the underlying buffer in the process.
/// </summary>
/// <param name="row">String8 containing a CSV row</param>
/// <param name="positions">PartialArray<int> to contain split positions</param>
/// <returns>String8Set containing unencoded cell values</returns>
public static String8Set SplitAndDecodeCsvCells(String8 row, PartialArray <int> positions)
{
// If row is empty, return empty set
if (row.IsEmpty())
{
return(String8Set.Empty);
}
// Clear any previous values in the array
positions.Clear();
// The first part always begins at the start of the (shifted) string
positions.Add(0);
byte[] array = row._buffer;
int i = row._index;
int end = i + row._length;
// We're shifting values in the string to overwrite quotes around cells
// and doubled quotes. copyTo is where we've written to in the unescaped
// string.
int copyTo = i;
// Walk each cell, handling quoted and unquoted cells.
while (i < end)
{
bool inQuote = (array[i] == UTF8.Quote);
if (!inQuote)
{
// Unquoted cell. Copy until next comma.
for (; i < end; ++i, ++copyTo)
{
// Copy everything as-is (no unescaping)
array[copyTo] = array[i];
// If a delimiter is found, add another split position
if (array[i] == UTF8.Comma)
{
positions.Add(copyTo - row._index + 1);
i++; copyTo++;
break;
}
}
}
else
{
// Quoted cell.
// Overwrite opening quote
i++;
// Look for end quote (undoubled quote)
for (; i < end; ++i, ++copyTo)
{
if (array[i] != UTF8.Quote)
{
// Copy everything that wasn't an escaped quote
array[copyTo] = array[i];
}
else
{
// Quote found. End of cell, escaped quote, or unescaped quote (error)?
i++;
// End of cell [end of line]
if (i == end)
{
break;
}
if (array[i] == UTF8.Comma)
{
// End of cell [comma]. Copy comma, end of cell.
positions.Add(copyTo - row._index + 1);
array[copyTo] = array[i];
i++; copyTo++;
break;
}
else if (array[i] == UTF8.Quote)
{
// Escaped quote. Copy the second quote, continue cell.
array[copyTo] = array[i];
}
else
{
// Unescaped quote. Abort; caller will see incomplete row and can throw
return(new String8Set(row, 1, positions));
}
}
}
}
}
// The last part always ends at the end of the (shifted) string
positions.Add(copyTo - row._index + 1);
// Overwrite duplicate values left from shifting to make bugs clearer
for (; copyTo < end; ++copyTo)
{
array[copyTo] = UTF8.Null;
}
return(new String8Set(row, 1, positions));
}
internal String8Set(String8 content, int delimiterWidth, PartialArray <int> partPositions)
{
_content = content;
_partPositions = partPositions;
_delimiterWidth = delimiterWidth;
}
/// <summary>
/// Return the int[] length required for a buffer to split 'value'
/// by 'delimiter'. This may be an overestimate to perform better.
/// Used by callers to allocate a safe byte[] for String8Set.Split.
/// </summary>
/// <param name="value">Value to Split</param>
/// <param name="delimiter">Delimiter to Split by</param>
/// <returns>Length of byte[] required to safely contain value</returns>
public static int GetLength(String8 value, char delimiter)
{
return(GetLength(value, (byte)delimiter));
}
/// <summary>
/// Split a string on a given delimiter into a provided byte[]. Used
/// to split strings without allocation when a large byte[] is created
/// and reused for many strings.
/// </summary>
/// <param name="value">String8 value to split</param>
/// <param name="delimiter">Delimiter to split on</param>
/// <param name="positionArray">int[] to contain split positions, of at least length String8Set.SplitRequiredLength</param>
/// <returns>String8Set containing split value</returns>
public static String8Set Split(String8 value, byte delimiter, int[] positionArray)
{
return(Split(value, delimiter, new PartialArray <int>(positionArray)));
}
public bool TryGetRangeStartingWith(String8 prefix, out int firstIdentifier, out int lastIdentifier)
{
throw new NotImplementedException();
}
public bool TryFindString(String8 value, out int identifier)
{
return(_valueToIdentifier.TryGetValue(value.ToString(), out identifier));
}
public int FindOrAddString(String8 value)
{
return(FindOrAddString(value.ToString()));
}
public String8 this[int identifier]
{
get { return(String8.Convert(_values[identifier], new byte[String8.GetLength(_values[identifier])])); }
}
/// <summary>
/// Create a concatenation of three String8s. Used to join values
/// with a delimiter in a memory efficient way.
/// </summary>
/// <param name="first">First Value</param>
/// <returns>String8 copy which will persist</returns>
public String8 Concatenate(String8 first, String8 delimiter, String8 second)
{
// If either string is empty, use only the other [if both empty, String8.Empty returned]
if (first.IsEmpty())
{
return(GetCopy(second));
}
if (second.IsEmpty())
{
return(GetCopy(first));
}
BlockPart targetBlock = null;
// Find the Block hosting the value (if it is already here)
int blockIndex = _blocks.Count - 1;
for (; blockIndex >= 0; --blockIndex)
{
if (first._buffer == _blocks[blockIndex].Block)
{
targetBlock = _blocks[blockIndex];
break;
}
}
// If "first" is the last thing on the block...
if (targetBlock != null && targetBlock.LengthUsed == first._index + first._length)
{
// If there's room to concatenate in place, do that
if (targetBlock.Block.Length >= targetBlock.LengthUsed + delimiter.Length + second.Length)
{
targetBlock.LengthUsed += delimiter.WriteTo(targetBlock.Block, targetBlock.LengthUsed);
targetBlock.LengthUsed += second.WriteTo(targetBlock.Block, targetBlock.LengthUsed);
return(new String8(first._buffer, first._index, targetBlock.LengthUsed - first._index));
}
// If not, "remove" first from the block to recycle the space
if (first._index == 0)
{
// If first was alone, remove the whole block
_blocks.RemoveAt(blockIndex);
}
else
{
// Deduct the used space for "first"
_blocks[blockIndex].LengthUsed -= first.Length;
}
}
// Find new room for the concatenated value
int requiredLength = first.Length + delimiter.Length + second.Length;
targetBlock = GetBlockForLength((int)(1.5 * requiredLength));
// Write the parts to the chosen block and return a reference to the new copy
int startPosition = targetBlock.LengthUsed;
targetBlock.LengthUsed += first.WriteTo(targetBlock.Block, targetBlock.LengthUsed);
targetBlock.LengthUsed += delimiter.WriteTo(targetBlock.Block, targetBlock.LengthUsed);
targetBlock.LengthUsed += second.WriteTo(targetBlock.Block, targetBlock.LengthUsed);
return(new String8(targetBlock.Block, startPosition, targetBlock.LengthUsed - startPosition));
}
public bool TryFindString(string value, out Range matches)
{
return(TryFindString(String8.Convert(value, new byte[String8.GetLength(value)]), out matches));
}
