private String8 Between(String8 text, String8 prefix, String8 suffix)
{
// Find (first) prefix
int index = text.IndexOf(prefix);
// If prefix not found, return full text
if (index == -1)
{
return(text);
}
// If prefix at end of value, return empty
int afterIndex = index + prefix.Length;
if (afterIndex >= text.Length)
{
return(String8.Empty);
}
// Find first suffix after prefix end
int beforeIndex = text.IndexOf(suffix, afterIndex);
// If suffix not found, return everything after prefix
if (beforeIndex == -1)
{
return(text.Substring(afterIndex));
}
// Otherwise, return between
return(text.Substring(afterIndex, beforeIndex - afterIndex));
}
public static void WriteHtmlEscaped(String8 value, ITabularWriter writer)
{
writer.WriteValueStart();
int writeFrom = 0;
while (true)
{
// Look for an Html Tag
int startOfTag = value.IndexOf((byte)'<', writeFrom);
if (startOfTag == -1)
{
break;
}
// Write up to the tag
writer.WriteValuePart(value.Substring(writeFrom, startOfTag - writeFrom));
// Find the end of the tag
int endOfTag = value.IndexOf((byte)'>', startOfTag + 1);
if (endOfTag == -1)
{
// Error: Unclosed tag, don't write anything else
writeFrom = value.Length;
break;
}
writeFrom = endOfTag + 1;
}
// Write the value after the last tag
writer.WriteValuePart(value.Substring(writeFrom));
writer.WriteValueEnd();
}
public void String8_ShiftBack()
{
String8Block block = new String8Block();
// Goal: Split on semi-colon, collapse semi-colon and spaces in-place
String8 shiftable = "One; Two;Three; Four".TestConvert();
int totalShift = 0;
String8Set parts = shiftable.Split(UTF8.Semicolon, new PartialArray <int>(5, false));
for (int i = 0; i < parts.Count; ++i)
{
String8 part = parts[i];
totalShift++;
if (part.StartsWith(UTF8.Space))
{
part = part.Substring(1);
totalShift++;
}
String8 beforeShift = block.GetCopy(part);
String8 shifted = part.ShiftBack(totalShift);
Assert.AreEqual(beforeShift, shifted);
}
String8 result = shiftable.Substring(0, shiftable.Length - totalShift);
Assert.AreNotEqual("OneTwoThreeFour", result.ToString());
}
/// <summary>
/// NextBlock is called by NextRow before reading the last row in _currentBlock.
/// Since the file is read in blocks, the last row is usually incomplete.
///
/// If there's more file content, NextBlock should copy the last row to the start
/// of the buffer, read more content, and reset _currentBlock to the new split rows
/// and _nextRowIndexInBlock to zero (telling NextRow to read that row next).
///
/// If there's no more file, the last row is complete. NextBlock must return
/// without changing _currentBlock or _nextRowIndexInBlock to tell NextRow it's safe
/// to return to the user.
///
/// NextRow will call NextBlock *again* after the last row. NextBlock must again
/// not change anything to tell NextRow that there's nothing left.
///
/// So, NextBlock must:
/// - Copy the last row to the start of the buffer (if not already there)
/// - Read more content to fill the buffer
/// - Split the buffer into rows
/// - Stop at end-of-file or when a full row was read
/// - Double the buffer until one of these conditions is met
///
/// - Reset nextRowInIndexBlock *only if* a row was shifted or read
/// </summary>
private void NextBlock()
{
int bufferLengthFilledStart = 0;
// Copy the last row to the start of the buffer (if not already there)
if (_currentBlock.Count > 1)
{
String8 lastRow = _currentBlock[_currentBlock.Count - 1];
lastRow.WriteTo(_buffer, 0);
bufferLengthFilledStart = lastRow.Length;
// Reset the next row to read (since we shifted a row)
_nextRowIndexInBlock = 0;
}
int bufferLengthFilled = bufferLengthFilledStart;
while (true)
{
// Read more content to fill the buffer
bufferLengthFilled += _stream.Read(_buffer, bufferLengthFilled, _buffer.Length - bufferLengthFilled);
String8 block = new String8(_buffer, 0, bufferLengthFilled);
// Strip leading UTF8 BOM, if found, on first block
if (_stream.Position == bufferLengthFilled)
{
if (block.Length >= 3 && block[0] == 0xEF && block[1] == 0xBB && block[2] == 0xBF)
{
block = block.Substring(3);
}
}
// Split the buffer into rows
_currentBlock = _splitRows(block, _rowPositionArray);
// Stop at end-of-file (read didn't fill buffer)
if (bufferLengthFilled < _buffer.Length)
{
break;
}
// Stop when a full row was read (split found at least two parts)
if (_currentBlock.Count > 1)
{
break;
}
// Otherwise, double the buffer (until a full row or end of file)
byte[] newBuffer = new byte[_buffer.Length * 2];
_buffer.CopyTo(newBuffer, 0);
_buffer = newBuffer;
}
// If we read new content, reset the next row to read
if (bufferLengthFilled > bufferLengthFilledStart)
{
_nextRowIndexInBlock = 0;
}
}
protected override String8Set SplitCells(String8 row, PartialArray <int> cellPositionArray)
{
// Remove trailing '\r' to handle '\r\n' and '\n' line endings uniformly
if (row.EndsWith(UTF8.CR))
{
row = row.Substring(0, row.Length - 1);
}
return(row.SplitAndDecodeCsvCells(cellPositionArray));
}
private String8 BeforeFirst(String8 text, String8 value)
{
int index = text.IndexOf(value);
if (index == -1)
{
return(text);
}
return(text.Substring(0, index));
}
private String8 Truncate(String8 text, int limit)
{
if (text.Length < limit)
{
return(text);
}
else
{
return(text.Substring(0, limit));
}
}
protected override void WriteCellValue(Stream stream, String8 value)
{
// Escaping: If value contains cell or row delimiter, just omit them
// No standard for TSV escaping.
int nextWriteStartIndex = 0;
int end = value.Index + value.Length;
for (int i = value.Index; i < end; ++i)
{
byte c = value.Array[i];
if (c == UTF8.Tab || c == UTF8.Newline)
{
int inStringIndex = i - value.Index;
value.Substring(nextWriteStartIndex, inStringIndex - nextWriteStartIndex).WriteTo(stream);
nextWriteStartIndex = inStringIndex + 1;
}
}
value.Substring(nextWriteStartIndex).WriteTo(stream);
}
/// <summary>
/// Write UTF8 content escaped properly to be in double-quotes, but don't
/// write the surrounding quotes.
/// </summary>
/// <param name="value">UTF8 value to write</param>
private void WriteEscaped(String8 value)
{
int nextWriteStartIndex = 0;
int end = value.Index + value.Length;
for (int i = value.Index; i < end; ++i)
{
byte c = value.Array[i];
bool isControl = c < 32;
if (isControl || c == UTF8.Backslash || c == UTF8.Quote)
{
int inStringIndex = i - value.Index;
// Write everything before this escaped portion
value.Substring(nextWriteStartIndex, inStringIndex - nextWriteStartIndex).WriteTo(_stream);
// Write the escaped character
if (isControl)
{
s_escapedCharPrefix.WriteTo(_stream);
_stream.WriteByte(ToHexDigit(c / 16));
_stream.WriteByte(ToHexDigit(c & 0xF));
}
else
{
_stream.WriteByte(UTF8.Backslash);
_stream.WriteByte(c);
}
// Track the next block which doesn't need escaping
nextWriteStartIndex = inStringIndex + 1;
}
}
// Write the trailing unescaped block
value.Substring(nextWriteStartIndex).WriteTo(_stream);
}
public void String8_StartsWithEndsWith()
{
string collections = "Collections";
String8 collections8 = collections.TestConvert();
string collectionsCasing = "coLLecTionS";
String8 collectionsCasing8 = collectionsCasing.TestConvert();
Assert.IsFalse(String8.Empty.StartsWith(UTF8.Space));
Assert.IsFalse(String8.Empty.EndsWith(UTF8.Space));
Assert.IsTrue(collections8.StartsWith((byte)'C'));
Assert.IsFalse(collections8.StartsWith((byte)'c'));
Assert.IsFalse(collections8.StartsWith(UTF8.Newline));
Assert.IsTrue(collections8.EndsWith((byte)'s'));
Assert.IsFalse(collections8.EndsWith((byte)'S'));
Assert.IsFalse(collections8.EndsWith(UTF8.Newline));
Assert.IsFalse(String8.Empty.StartsWith(collections8));
Assert.IsFalse(String8.Empty.EndsWith(collections8));
Assert.IsFalse(String8.Empty.StartsWith(collections8, true));
Assert.IsFalse(String8.Empty.EndsWith(collections8, true));
Assert.IsTrue(collections8.EndsWith(collections8));
Assert.IsTrue(collections8.EndsWith(collections8.Substring(1)));
Assert.IsTrue(collections8.EndsWith(collections8.Substring(8)));
Assert.IsFalse(collections8.EndsWith(collectionsCasing8));
Assert.IsTrue(collections8.EndsWith(collectionsCasing8, true));
Assert.IsTrue(collections8.StartsWith(collections8));
Assert.IsTrue(collections8.StartsWith(collections8.Substring(0, collections8.Length - 1)));
Assert.IsTrue(collections8.StartsWith(collections8.Substring(0, 3)));
Assert.IsFalse(collections8.StartsWith(collectionsCasing8));
Assert.IsTrue(collections8.StartsWith(collectionsCasing8, true));
}
protected override void WriteValuePart(Stream stream, String8 value)
{
// Look for quotes in string
int nextWriteStartIndex = 0;
int end = value._index + value._length;
for (int i = value._index; i < end; ++i)
{
byte c = value._buffer[i];
if (c == UTF8.Quote)
{
// Write everything including quote
int inStringIndex = i - value._index;
value.Substring(nextWriteStartIndex, inStringIndex - nextWriteStartIndex).WriteTo(stream);
nextWriteStartIndex = inStringIndex;
// Write a second quote
stream.WriteByte(UTF8.Quote);
}
}
// Write content after the last quote seen
value.Substring(nextWriteStartIndex).WriteTo(stream);
}
/// <summary>
/// Move the reader to the next row. This must be called before
/// reading the first row.
/// </summary>
/// <returns>True if another row exists, False if the TSV is out of content</returns>
public bool NextRow()
{
// If we're on the last row, ask for more (we don't read the last row in case it was only partially read into the buffer)
if (_nextRowIndexInBlock >= _currentBlock.Count - 1)
{
NextBlock();
}
// If there are no more rows, return false
if (_nextRowIndexInBlock >= _currentBlock.Count)
{
return(false);
}
// Get the next (complete) row from the current block
String8 currentLine = _currentBlock[_nextRowIndexInBlock];
// Strip leading UTF8 BOM, if found, on first row
if (_rowCountRead == 0)
{
if (currentLine.Length >= 3 && currentLine[0] == 0xEF && currentLine[1] == 0xBB && currentLine[2] == 0xBF)
{
currentLine = currentLine.Substring(3);
}
}
// Split the line into cells
_currentRow = SplitCells(currentLine, _cellPositionArray);
_rowCountRead++;
_nextRowIndexInBlock++;
// Allocate a set of reusable String8TabularValues to avoid per-cell-value allocation or boxing.
if (_valueBoxes == null || _valueBoxes.Length < _currentRow.Count)
{
_valueBoxes = new String8TabularValue[_currentRow.Count];
for (int i = 0; i < _valueBoxes.Length; ++i)
{
_valueBoxes[i] = new String8TabularValue();
}
}
return(true);
}
private String8 AfterFirst(String8 text, String8 value)
{
int index = text.IndexOf(value);
if (index == -1)
{
return(text);
}
int afterIndex = index + value.Length;
if (afterIndex >= text.Length)
{
return(String8.Empty);
}
return(text.Substring(afterIndex));
}
private string MatchToString(Match2 match, String8 content)
{
return($"({match.Index}, {match.Length}: '{content.Substring(match.Index, match.Length)}')");
}
public bool NextRow()
{
_currentRowBlock.Clear();
String8 row = _reader.NextRow();
if (row.IsEmpty())
{
return(false);
}
// Clear values for row
for (int i = 0; i < _currentRowValues.Length; ++i)
{
_currentRowValues[i].SetValue(String8.Empty);
}
// Read available complete lines
String8 currentPropertyName = String8.Empty;
String8 currentPropertyValue = String8.Empty;
bool currentIsBase64 = false;
for (; _nextLineIndex < _blockLines.Count; ++_nextLineIndex)
{
String8 line = _blockLines[_nextLineIndex];
// Skip comment lines and grouping lines
if (line.StartsWith(UTF8.Pound) || line.StartsWith(UTF8.Dash))
{
continue;
}
// Trim trailing CR, if found
if (line.EndsWith(UTF8.CR))
{
line = line.Substring(0, line.Length - 1);
}
// An empty line or out of lines for the row range
if (line.Length == 0 || line.Index >= row.Index + row.Length)
{
break;
}
// Look for a wrapped line
if (line[0] == UTF8.Space)
{
// If found, concatenate the value after the space onto the value so far
line = line.Substring(1);
currentPropertyValue = _currentRowBlock.Concatenate(currentPropertyValue, String8.Empty, line);
}
else
{
// Set or Append the value just completed
SetColumnValue(currentPropertyName, currentPropertyValue, currentIsBase64);
// Split the property name and value [value is after colon and optional space]
currentPropertyName = line.BeforeFirst(UTF8.Colon);
currentPropertyValue = line.Substring(currentPropertyName.Length + 1);
if (currentPropertyValue.StartsWith(UTF8.Space))
{
currentPropertyValue = currentPropertyValue.Substring(1);
}
// Determine if the value is encoded
currentIsBase64 = (line[currentPropertyName.Length + 1] == UTF8.Colon);
if (currentIsBase64)
{
currentPropertyValue = currentPropertyValue.Substring(1);
}
}
}
// Set the last property value
SetColumnValue(currentPropertyName, currentPropertyValue, currentIsBase64);
// The next row starts after the row separator line
_nextLineIndex++;
this.RowCountRead++;
return(true);
}
