public blk()
{
prv = null;
nxt = null;
n = 0;
data = new char[blksiz];
}
public ssRawTextV1(string s)
{
first = new blk();
last = first;
curblk = first;
curoff = 0;
curpos = 0;
len = 0;
}
private void StrDel(blk b, int o, int n)
{
int src = o + n;
while (src < b.n)
{
b.data[o++] = b.data[src++];
}
b.n -= n;
len -= n;
}
public void Insert(int i, string s)
{
Seek(i);
if (curoff == 0 && curblk.prv != null)
{
curblk = curblk.prv;
curoff = curblk.n;
}
int o = curoff;
blk b = curblk;
int soff = 0;
int n = s.Length;
while (n > 0)
{
if (n + b.n <= blksiz && b.n < fill) // it fits in the block
{
StrIns(ref s, soff, b, o, n);
n = 0;
}
else if (o != 0 && o != b.n) // doesn't fit, in the middle
{
BlkSplit(b, o);
}
else if (o == b.n) // doesn't fit, at the end
{
if (b.n < fill) // filled up enough?
{
int dn = fill - b.n;
StrIns(ref s, soff, b, o, dn);
n -= dn;
o += dn;
soff += dn;
}
else // too filled, add block
{
b = BlkApp(b);
o = 0;
}
}
else // doesn't fit, at the beginning
{
b = BlkIns(b);
o = 0;
curblk = b;
}
}
if (curoff == curblk.n && curblk.nxt != null)
{
curblk = curblk.nxt;
curoff = 0;
}
}
private void Seek(int i)
{
if (i < 0 || len < i)
{
RangeErr();
}
if (i == 0)
{
curblk = first; curoff = 0; curpos = 0; return;
}
if (i == len)
{
curblk = last; curoff = curblk.n; curpos = len; return;
}
if (i > curpos)
{
curpos -= curoff;
while (i >= curpos + curblk.n)
{
curpos += curblk.n;
if (curblk.nxt != null)
{
curblk = curblk.nxt;
}
else
{
curoff = curblk.n;
return;
}
}
curoff = i - curpos;
}
else if (i < curpos)
{
curpos -= curoff;
while (i < curpos)
{
if (curblk.prv != null)
{
curblk = curblk.prv;
}
else
{
curoff = 0;
return;
}
curpos -= curblk.n;
}
curoff = i - curpos;
}
curpos = i;
}
private void BlkSplit(blk a, int o)
{
blk b = BlkApp(a);
int src = o;
int dst = 0;
while (src < a.n)
{
b.data[dst++] = a.data[src++];
}
a.n = o;
b.n = dst;
}
private blk BlkApp(blk a)
{
blk b = new blk();
b.nxt = a.nxt;
b.prv = a;
if (b.nxt != null)
{
b.nxt.prv = b;
}
else
{
last = b;
}
a.nxt = b;
return(b);
}
private blk BlkIns(blk a)
{
blk b = new blk();
b.nxt = a;
b.prv = a.prv;
if (b.prv != null)
{
b.prv.nxt = b;
}
else
{
first = b;
}
a.prv = b;
return(b);
}
private void StrIns(ref string s, int soff, blk b, int o, int m)
{
int src = b.n;
int dst = src + m;
while (src > o)
{
b.data[--dst] = b.data[--src];
}
src = soff;
dst = o;
int i = 0;
while (i++ < m)
{
b.data[dst++] = s[src++];
}
b.n += m;
len += m;
}
public void Remove(int i, int n)
{
if (i + n > len)
{
RangeErr();
}
Seek(i);
blk b = curblk;
int o = curoff;
while (n > 0)
{
if (o == 0 && n >= b.n) // at beginning, deleting all or more
{
n -= b.n;
b = BlkDel(b);
curblk = b;
curoff = 0;
}
else
{
if (o + n < b.n) // beginning or middle, deleting less than all
{
StrDel(b, o, n);
n = 0;
}
else // middle or end, deleting all or more
{
int dn = b.n - o;
n -= dn;
len -= dn;
b.n = o;
if (n > 0)
{
b = b.nxt;
o = 0;
}
}
}
}
}
public override string ToString()
{
blk b = first;
string s = "";
int pos = 0;
int k = 0;
int kb = 0;
while (b != null)
{
if (curblk == b)
{
kb = k;
}
s += k + ": #" + pos + ",#" + (pos + b.n) + ", " + b.n + ", \"";
for (int i = 0; i < b.n; i++)
{
char c = b.data[i];
if (c == '\r')
{
s += "\\r";
}
else if (c == '\n')
{
s += "\\n";
}
else
{
s += b.data[i];
}
}
s += "\"\r\n";
pos += b.n;
b = b.nxt;
k++;
}
s += "\r\nblk: " + kb + ", " + curoff + ", pos: " + curpos + "\r\n";
return(s);
}
public string ToString(int i, int n)
{
if (i + n > len)
{
RangeErr();
}
Seek(i);
int o = curoff;
blk b = curblk;
StringBuilder s = new StringBuilder("", n);
for (int j = 0; j < n; j++)
{
if (o == b.n)
{
b = b.nxt;
o = 0;
}
s.Append(b.data[o++]);
}
return(s.ToString());
}
private blk BlkDel(blk b)
{
len -= b.n;
if (b.nxt == null)
{
b.n = 0; return(b);
}
else
{
b.nxt.prv = b.prv;
if (b.prv != null)
{
b.prv.nxt = b.nxt;
}
else
{
first = b.nxt;
}
return(b.nxt);
}
}
