private static void ParseBlock(char[] buffer, int length, ILineBreaksEditor lineBreaks,
ref LineEndingState lineEnding, ref int currentLineLength, ref int longestLineLength)
{
int index = 0;
while (index < length)
{
int breakLength = TextUtilities.LengthOfLineBreak(buffer, index, length);
if (breakLength == 0)
{
++currentLineLength;
++index;
}
else
{
lineBreaks.Add(index, breakLength);
longestLineLength = Math.Max(longestLineLength, currentLineLength);
currentLineLength = 0;
if (lineEnding != LineEndingState.Inconsistent)
{
if (breakLength == 2)
{
if (lineEnding == LineEndingState.Unknown)
{
lineEnding = LineEndingState.CRLF;
}
else if (lineEnding != LineEndingState.CRLF)
{
lineEnding = LineEndingState.Inconsistent;
}
}
else
{
LineEndingState newLineEndingState;
switch (buffer[index])
{
// This code needs to be kep consistent with TextUtilities.LengthOfLineBreak()
case '\r': newLineEndingState = LineEndingState.CR; break;
case '\n': newLineEndingState = LineEndingState.LF; break;
case '\u0085': newLineEndingState = LineEndingState.NEL; break;
case '\u2028': newLineEndingState = LineEndingState.LS; break;
case '\u2029': newLineEndingState = LineEndingState.PS; break;
default: throw new InvalidOperationException("Unexpected line ending");
}
if (lineEnding == LineEndingState.Unknown)
{
lineEnding = newLineEndingState;
}
else if (lineEnding != newLineEndingState)
{
lineEnding = LineEndingState.Inconsistent;
}
}
}
index += breakLength;
}
}
}
internal static StringRebuilder Load(TextReader reader, long fileSize, string id,
out bool hasConsistentLineEndings, out int longestLineLength,
int blockSize = 0,
int minCompressedBlockSize = TextImageLoader.BlockSize) // Exposed for unit tests
{
LineEndingState lineEnding = LineEndingState.Unknown;
int currentLineLength = 0;
longestLineLength = 0;
bool useCompressedStringRebuilders = (fileSize >= TextModelOptions.CompressedStorageFileSizeThreshold);
if (blockSize == 0)
{
blockSize = useCompressedStringRebuilders ? TextModelOptions.CompressedStoragePageSize : TextImageLoader.BlockSize;
}
PageManager pageManager = null;
char[] buffer;
if (useCompressedStringRebuilders)
{
pageManager = new PageManager();
buffer = new char[blockSize];
}
else
{
buffer = TextImageLoader.AcquireBuffer(blockSize);
}
StringRebuilder content = StringRebuilderForChars.Empty;
try
{
while (true)
{
int read = TextImageLoader.LoadNextBlock(reader, buffer);
if (read == 0)
{
break;
}
var lineBreaks = LineBreakManager.CreateLineBreakEditor(read);
TextImageLoader.ParseBlock(buffer, read, lineBreaks, ref lineEnding, ref currentLineLength, ref longestLineLength);
char[] bufferForStringBuilder = buffer;
if (read < (buffer.Length / 2))
{
// We read far less characters than buffer so copy the contents to a new buffer and reuse the original buffer.
bufferForStringBuilder = new char[read];
Array.Copy(buffer, bufferForStringBuilder, read);
}
else
{
// We're using most of bufferForStringRebuilder so allocate a new block for the next chunk.
buffer = new char[blockSize];
}
var newContent = (useCompressedStringRebuilders && (read > minCompressedBlockSize))
? StringRebuilderForCompressedChars.Create(new Page(pageManager, bufferForStringBuilder, read), lineBreaks)
: StringRebuilderForChars.Create(bufferForStringBuilder, read, lineBreaks);
content = content.Insert(content.Length, newContent);
}
longestLineLength = Math.Max(longestLineLength, currentLineLength);
hasConsistentLineEndings = lineEnding != LineEndingState.Inconsistent;
}
finally
{
if (!useCompressedStringRebuilders)
{
TextImageLoader.ReleaseBuffer(buffer);
}
}
return(content);
}
private static ILineBreaks ParseBlock(char[] buffer, int length,
ref LineEndingState lineEnding, ref int currentLineLength, ref int longestLineLength)
{
// Note that the lineBreaks created here will (internally) use the pooled list of line breaks.
IPooledLineBreaksEditor lineBreaks = LineBreakManager.CreatePooledLineBreakEditor(length);
int index = 0;
while (index < length)
{
int breakLength = TextUtilities.LengthOfLineBreak(buffer, index, length);
if (breakLength == 0)
{
++currentLineLength;
++index;
}
else
{
lineBreaks.Add(index, breakLength);
longestLineLength = Math.Max(longestLineLength, currentLineLength);
currentLineLength = 0;
if (lineEnding != LineEndingState.Inconsistent)
{
if (breakLength == 2)
{
if (lineEnding == LineEndingState.Unknown)
{
lineEnding = LineEndingState.CRLF;
}
else if (lineEnding != LineEndingState.CRLF)
{
lineEnding = LineEndingState.Inconsistent;
}
}
else
{
LineEndingState newLineEndingState;
switch (buffer[index])
{
// This code needs to be kep consistent with TextUtilities.LengthOfLineBreak()
case '\r': newLineEndingState = LineEndingState.CR; break;
case '\n': newLineEndingState = LineEndingState.LF; break;
case '\u0085': newLineEndingState = LineEndingState.NEL; break;
case '\u2028': newLineEndingState = LineEndingState.LS; break;
case '\u2029': newLineEndingState = LineEndingState.PS; break;
default: throw new InvalidOperationException("Unexpected line ending");
}
if (lineEnding == LineEndingState.Unknown)
{
lineEnding = newLineEndingState;
}
else if (lineEnding != newLineEndingState)
{
lineEnding = LineEndingState.Inconsistent;
}
}
}
index += breakLength;
}
}
lineBreaks.ReleasePooledLineBreaks();
return(lineBreaks);
}
