/// <summary>
/// Traverses the PGN move text section, adding the moves to the model.
/// Throws ArgumentException if there is an illegal SAN move.
/// </summary>
/// <param name="tr">The texr reader which is read from</param>
private void TraversePGNMovetext(TextReader tr)
{
string line;
int index, from, to;
// skip the empty lines
do
{
line = tr.ReadLine();
}
while (line != null && line.Length == 0);
// read the lines
while (line != null && line.Length > 0)
{
// it's an escape line, skip it
if (line[0] == '%')
{
line = tr.ReadLine();
continue;
}
index = 0;
// loop through the line characters
while (index < line.Length)
{
// skip the white spaces
if (line[index] == ' ')
{
while (++index < line.Length && line[index] == ' ') ;
}
// it's a "rest of line" comment, go to the next line
if (index < line.Length && line[index] == ';')
{
line = tr.ReadLine();
index = 0;
continue;
}
// skip the move numbers, the NAG or the game termination tokens
if (index < line.Length && ((line[index] >= '0' && line[index] <= '9') || line[index] == '$' || line[index] == '*'))
{
while (++index < line.Length && line[index] != ' ') ;
}
// skip the multiline commentaries
else if (index < line.Length && line[index] == '{')
{
while (line[index++] != '}')
{
if (index >= line.Length)
{
line = tr.ReadLine();
index = 0;
}
}
}
// skip the RAV which can be nested
else if (index < line.Length && line[index] == '(')
{
int depth = 1;
while (depth != 0)
{
if (++index >= line.Length)
{
line = tr.ReadLine();
index = 0;
}
if (line[index] == '(')
{
depth++;
}
else if (line[index] == ')')
{
depth--;
}
}
index++;
}
// if the token it's a move, make it
else if (index < line.Length)
{
from = index;
while (++index < line.Length && line[index] != ' ') ;
to = index;
// remove any !? annotations
if (line[to - 1] == '!' || line[to - 1] == '?')
{
to--;
}
if (line[to - 1] == '!' || line[to - 1] == '?')
{
to--;
}
// make the move
model.Make(Utils.GetSANMove(model, line.Substring(from, to - from)));
}
}
line = tr.ReadLine();
}
}