public static ILineBreaks CreateLineBreaks(string source)
{
IPooledLineBreaksEditor lineBreaks = null;
int index = 0;
while (index < source.Length)
{
int breakLength = TextUtilities.LengthOfLineBreak(source, index, source.Length);
if (breakLength == 0)
{
++index;
}
else
{
if (lineBreaks == null)
{
lineBreaks = LineBreakManager.CreatePooledLineBreakEditor(source.Length);
}
lineBreaks.Add(index, breakLength);
index += breakLength;
}
}
if (lineBreaks != null)
{
lineBreaks.ReleasePooledLineBreaks();
return(lineBreaks);
}
return(Empty);
}
// Evil performance hack (but we are on a hot path here):
// thresholdForInvalidCharacters should be '\u0001' if we are throwing on invalid characters.
// should be '\0' if we are not.
// (otherwise we need to check both a throwOnInvalidCharacters boolean and that c == 0).
private static ILineBreaks ParseBlock(char[] buffer, int length, char thresholdForInvalidCharacters,
ref NewlineState newlineState,
ref LeadingWhitespaceState leadingWhitespaceState,
ref int currentLineLength,
ref int longestLineLength,
ref bool nextCharIsStartOfLine)
{
// 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)
{
char c = buffer[index];
// If we are checking for invalid characters, throw if we encounter a \0
if (c < thresholdForInvalidCharacters)
{
throw new FileFormatException("File contains NUL characters");
}
++currentLineLength;
++index;
if (nextCharIsStartOfLine)
{
switch (c)
{
case ' ':
leadingWhitespaceState.Increment(LeadingWhitespaceState.LineLeadingCharacter.Space, 1);
break;
case '\t':
leadingWhitespaceState.Increment(LeadingWhitespaceState.LineLeadingCharacter.Tab, 1);
break;
default:
leadingWhitespaceState.Increment(LeadingWhitespaceState.LineLeadingCharacter.Printable, 1);
break;
}
nextCharIsStartOfLine = false;
}
}
else
{
lineBreaks.Add(index, breakLength);
longestLineLength = Math.Max(longestLineLength, currentLineLength);
currentLineLength = 0;
if (breakLength == 2)
{
newlineState.Increment(NewlineState.LineEnding.CRLF, 1);
}
else
{
switch (buffer[index])
{
// This code needs to be kep consistent with TextUtilities.LengthOfLineBreak()
case '\r': newlineState.Increment(NewlineState.LineEnding.CR, 1); break;
case '\n': newlineState.Increment(NewlineState.LineEnding.LF, 1); break;
case '\u0085': newlineState.Increment(NewlineState.LineEnding.NEL, 1); break;
case '\u2028': newlineState.Increment(NewlineState.LineEnding.LS, 1); break;
case '\u2029': newlineState.Increment(NewlineState.LineEnding.PS, 1); break;
default: throw new InvalidOperationException("Unexpected line ending");
}
}
if (nextCharIsStartOfLine)
{
leadingWhitespaceState.Increment(LeadingWhitespaceState.LineLeadingCharacter.Empty, 1);
}
nextCharIsStartOfLine = true;
}
index += breakLength;
}
lineBreaks.ReleasePooledLineBreaks();
return(lineBreaks);
}
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);
}
