/// <summary>
/// Consolidate two string rebuilders, taking advantage of the fact that they have already extracted the line breaks.
/// </summary>
public static StringRebuilder Consolidate(StringRebuilder left, StringRebuilder right)
{
Debug.Assert(left.Length > 0);
Debug.Assert(right.Length > 0);
int length = left.Length + right.Length;
char[] result = new char[length];
left.CopyTo(0, result, 0, left.Length);
right.CopyTo(0, result, left.Length, right.Length);
ILineBreaks lineBreaks;
if ((left.LineBreakCount == 0) && (right.LineBreakCount == 0))
{
lineBreaks = LineBreakManager.Empty;
//_lineBreakSpan defaults to 0, 0 which is what we want
}
else
{
ILineBreaksEditor breaks = LineBreakManager.CreateLineBreakEditor(length, left.LineBreakCount + right.LineBreakCount);
int offset = 0;
if ((result[left.Length] == '\n') && (result[left.Length - 1] == '\r'))
{
//We have a \r\n spanning the seam ... add that as a special linebreak later.
offset = 1;
}
int leftLines = left.LineBreakCount - offset;
for (int i = 0; (i < leftLines); ++i)
{
Span extent;
int lineBreakLength;
left.GetLineFromLineNumber(i, out extent, out lineBreakLength);
breaks.Add(extent.End, lineBreakLength);
}
if (offset == 1)
{
breaks.Add(left.Length - 1, 2);
}
for (int i = offset; (i < right.LineBreakCount); ++i)
{
Span extent;
int lineBreakLength;
right.GetLineFromLineNumber(i, out extent, out lineBreakLength);
breaks.Add(extent.End + left.Length, lineBreakLength);
}
lineBreaks = breaks;
}
return(StringRebuilderForChars.Create(result, length, lineBreaks));
}
public override StringRebuilder GetSubText(Span span)
{
if (span.End > this.Length)
{
throw new ArgumentOutOfRangeException("span");
}
if (span.Length == 0)
{
return(StringRebuilder.Empty);
}
else if (span.Length == this.Length)
{
return(this);
}
else
{
int firstLineNumber;
int lastLineNumber;
this.FindFirstAndLastLines(span, out firstLineNumber, out lastLineNumber);
return(StringRebuilderForChars.Create(_content, _lineBreaks, span.Start + _textSpanStart, span.Length, firstLineNumber, lastLineNumber - firstLineNumber));
}
}
internal static StringRebuilder Load(TextReader reader, long fileSize,
out NewlineState newlineState,
out LeadingWhitespaceState leadingWhitespaceState,
out int longestLineLength,
int blockSize = 0,
int minCompressedBlockSize = TextImageLoader.BlockSize, // Exposed for unit tests
bool throwOnInvalidCharacters = false)
{
newlineState = new NewlineState();
leadingWhitespaceState = new LeadingWhitespaceState();
int currentLineLength = 0;
longestLineLength = 0;
char thresholdForInvalidCharacters = throwOnInvalidCharacters ? '\u0001' : '\0'; // Basically the only invalid character is \0, if we are looking for invalid characters.
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
{
bool nextCharIsStartOfLine = true;
while (true)
{
int read = TextImageLoader.LoadNextBlock(reader, buffer);
if (read == 0)
{
break;
}
var lineBreaks = TextImageLoader.ParseBlock(
buffer,
read,
thresholdForInvalidCharacters,
ref newlineState,
ref leadingWhitespaceState,
ref currentLineLength,
ref longestLineLength,
ref nextCharIsStartOfLine);
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 buffer 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);
}
finally
{
if (!useCompressedStringRebuilders)
{
TextImageLoader.ReleaseBuffer(buffer);
}
}
return(content);
}
internal readonly char[] _content; // Contents should be treated as immutable.
internal static StringRebuilder Create(char[] source, int length, ILineBreaks lineBreaks)
{
return(StringRebuilderForChars.Create(source, lineBreaks, 0, length, 0, lineBreaks.Length));
}
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);
}
