public TextRun(TextBuffer srcTextBuffer, int startAt, int len, WordSpanKind kind)
{
this._srcText = srcTextBuffer;
this._startAt = startAt;
this._len = len;
this._kind = kind;
}
public TextRun(TextBuffer srcTextBuffer, int startAt, int len, WordSpanKind kind)
{
_srcText = srcTextBuffer;
_startAt = startAt;
_len = len;
_kind = kind;
}
public LexWordSpan(int start, ushort len, WordSpanKind kind)
{
this.start = start;
this.len = len;
this.kind = kind;
}
public virtual void Lex(TextBuffer textBuffer)
{
WordSpanKind lexMode = WordSpanKind.Unknown;
//simple line break / whitespace lexer
char[] buffer = textBuffer.UnsafeGetInternalBuffer();
int j = buffer.Length;
int startIndex = 0;
int len = 0;
spans.Clear();
for (int i = 0; i < j; ++i)
{
char c = buffer[i];
if (c == '\r')
{
if (len > 0)
{
//TODO: check if len > int?
var newspan = new LexWordSpan(startIndex,
(ushort)len, lexMode);
spans.Add(newspan);
startIndex = i;
len = 0;
}
len++;
lexMode = WordSpanKind.NewLine;
//if next is '\n'
if (i < j - 1)
{
char c1 = buffer[i + 1];
if (c1 == '\n')
{
//push accum wordspan
//
//newline wordspan
i++;
len++;
var newspan = new LexWordSpan(startIndex,
(ushort)len, lexMode);
spans.Add(newspan);
startIndex += len;
len = 0;
}
else
{
var newspan = new LexWordSpan(startIndex,
(ushort)len, lexMode);
spans.Add(newspan);
startIndex += len;
len = 0;
}
}
else
{
//the \r is last char
var newspan = new LexWordSpan(startIndex,
(ushort)len, lexMode);
spans.Add(newspan);
startIndex += len;
len = 0;
}
}
else if (c == '\n')
{
//new line?
if (len > 0)
{
//TODO: check if len > int?
var newspan = new LexWordSpan(startIndex,
(ushort)len, lexMode);
spans.Add(newspan);
startIndex = i;
len = 0;
}
//
lexMode = WordSpanKind.NewLine;
var newspan2 = new LexWordSpan(startIndex,
(ushort)len, lexMode);
spans.Add(newspan2);
len = 0;
startIndex = i;
}
else if (c == '\t')
{
//tab character
//
if (lexMode != WordSpanKind.Tab)
{
//flush
if (len > 0)
{
var newspan = new LexWordSpan(startIndex,
(ushort)len, lexMode);
spans.Add(newspan);
startIndex = i;
len = 0;
}
}
len++;
lexMode = WordSpanKind.Tab;
}
else if (char.IsWhiteSpace(c))
{
//whitespace
if (lexMode != WordSpanKind.WhiteSpace)
{
//change mode
if (len > 0)
{
//TODO: check if len > int?
var newspan = new LexWordSpan(startIndex,
(ushort)len, lexMode);
spans.Add(newspan);
startIndex = i;
len = 0;
}
}
len++;
lexMode = WordSpanKind.WhiteSpace;
}
else
{
if (lexMode != WordSpanKind.Text)
{
//change mode
if (len > 0)
{
//TODO: check if len > int?
var newspan = new LexWordSpan(startIndex,
(ushort)len, lexMode);
spans.Add(newspan);
startIndex = i;
len = 0;
}
}
len++;
lexMode = WordSpanKind.Text;
}
}
//
//finish
if (len > 0)
{
var newspan = new LexWordSpan(startIndex,
(ushort)len, lexMode);
spans.Add(newspan);
len = 0;
}
}
