private MathList?BuildInternal(bool oneCharOnly, char stopChar = '\0', MathList?r = null)
{
if (oneCharOnly && stopChar > '\0')
{
throw new InvalidCodePathException("Cannot set both oneCharOnly and stopChar");
}
r ??= new MathList();
MathAtom?prevAtom = null;
while (HasCharacters)
{
if (Error != null)
{
return(null);
}
MathAtom atom;
switch (GetNextCharacter())
{
case var ch when oneCharOnly && (ch == '^' || ch == '}' || ch == '_' || ch == '&'):
SetError($"{ch} cannot appear as an argument to a command");
return(r);
case var ch when stopChar > '\0' && ch == stopChar:
return(r);
case '^':
if (prevAtom == null || prevAtom.Superscript.IsNonEmpty() || !prevAtom.ScriptsAllowed)
{
prevAtom = new Ordinary(string.Empty);
r.Add(prevAtom);
}
// this is a superscript for the previous atom.
// note, if the next char is StopChar, it will be consumed and doesn't count as stop.
this.BuildInternal(true, r: prevAtom.Superscript);
if (Error != null)
{
return(null);
}
continue;
case '_':
if (prevAtom == null || prevAtom.Subscript.IsNonEmpty() || !prevAtom.ScriptsAllowed)
{
prevAtom = new Ordinary(string.Empty);
r.Add(prevAtom);
}
// this is a subscript for the previous atom.
// note, if the next char is StopChar, it will be consumed and doesn't count as stop.
this.BuildInternal(true, r: prevAtom.Subscript);
if (Error != null)
{
return(null);
}
continue;
case '{':
MathList?sublist;
if (_currentEnvironment != null && _currentEnvironment.Name == null)
{
// \\ or \cr which do not have a corrosponding \end
var oldEnv = _currentEnvironment;
_currentEnvironment = null;
sublist = BuildInternal(false, '}');
_currentEnvironment = oldEnv;
}
else
{
sublist = BuildInternal(false, '}');
}
if (sublist == null)
{
return(null);
}
prevAtom = sublist.Atoms.LastOrDefault();
r.Append(sublist);
if (oneCharOnly)
{
return(r);
}
continue;
#warning TODO Example
//https://phabricator.wikimedia.org/T99369
//https://phab.wmfusercontent.org/file/data/xsimlcnvo42siudvwuzk/PHID-FILE-bdcqexocj5b57tj2oezn/math_rendering.png
//dt, \text{d}t, \partial t, \nabla\psi \\ \underline\overline{dy/dx, \text{d}y/\text{d}x, \frac{dy}{dx}, \frac{\text{d}y}{\text{d}x}, \frac{\partial^2}{\partial x_1\partial x_2}y} \\ \prime,
case '}' when oneCharOnly || stopChar != 0:
throw new InvalidCodePathException("This should have been handled before.");
case '}':
SetError("Missing opening brace");
return(null);
case '\\':
var command = ReadCommand();
var done = StopCommand(command, r, stopChar);
if (done != null)
{
return(done);
}
if (Error != null)
{
return(null);
}
if (ApplyModifier(command, prevAtom))
{
continue;
}
if (LaTeXSettings.FontStyles.TryGetValue(command, out var fontStyle))
{
var oldSpacesAllowed = _textMode;
var oldFontStyle = _currentFontStyle;
_textMode = (command == "text");
_currentFontStyle = fontStyle;
var childList = BuildInternal(true);
if (childList == null)
{
return(null);
}
_currentFontStyle = oldFontStyle;
_textMode = oldSpacesAllowed;
prevAtom = childList.Atoms.LastOrDefault();
r.Append(childList);
if (oneCharOnly)
{
return(r);
}
continue;
}
switch (AtomForCommand(command, stopChar))
{
case null:
SetError(Error ?? "Internal error");
return(null);
case var a:
atom = a;
break;
}
break;
case '&': // column separation in tables
if (_currentEnvironment != null)
{
return(r);
}
var table = BuildTable(null, r, false, stopChar);
if (table == null)
{
return(null);
}
return(new MathList(table));
case '\'': // this case is NOT in iosMath
int i = 1;
while (ExpectCharacter('\''))
{
i++;
}
atom = new Prime(i);
break;
case ' ' when _textMode:
atom = new Ordinary(" ");
break;
case var ch when ch <= sbyte.MaxValue:
if (LaTeXSettings.ForAscii((sbyte)ch) is MathAtom asciiAtom)
{
atom = asciiAtom;
}
else
{
continue; // Ignore ASCII spaces and control characters
}
break;
case var ch:
// not a recognized character, display it directly
atom = new Ordinary(ch.ToStringInvariant());
break;
}
atom.FontStyle = _currentFontStyle;
r.Add(atom);
prevAtom = atom;
if (oneCharOnly)
{
return(r); // we consumed our character.
}
}
if (stopChar > 0)
{
if (stopChar == '}')
{
SetError("Missing closing brace");
}
else
{
// we never found our stop character.
SetError("Expected character not found: " + stopChar.ToStringInvariant());
}
}
return(r);
}
void Start()
{
anim = general.GetComponent <Animator>();
anim2 = Helmet.GetComponent <Animator>();
anim3 = Ordinary.GetComponent <Animator>();
}
public override List <Move> GenerateMoves(Board board)
{
var moves = new List <Move>();
Move move;
if (Color == Color.White)
{
var upSquare = From.To(Coordinate.Directions.North);
if (upSquare.IsEmpty(board) && From.Rank != 7)//Pawn can go up if it is empty square
{
move = new Ordinary(board, this, upSquare);
moves.Add(move);
var twoUpSquare = upSquare.To(Coordinate.Directions.North);
if (From.Rank == 2 && twoUpSquare.IsEmpty(board))//Check can jump 2 square when it is on rank 2
{
move = new Ordinary(board, this, twoUpSquare);
moves.Add(move);
}
}
if (From.Rank != 7)
{
Coordinate crossSquare = From.To(Coordinate.Directions.NorthEast);
//Check for capture
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.Black)
{
moves.Add(new Ordinary(board, this, crossSquare));
}
crossSquare = From.To(Coordinate.Directions.NorthWest);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.Black)
{
moves.Add(new Ordinary(board, this, crossSquare));
}
}
if (From.Rank == 5)//Check possibility of enpassant move
{
var crossSquare = From.To(Coordinate.Directions.NorthEast);
if (crossSquare.IsOnboard() && crossSquare.Equals(board.EnPassantSquare))
{
moves.Add(new EnPassant(board, this, crossSquare));
}
else
{
crossSquare = From.To(Coordinate.Directions.NorthWest);
if (crossSquare.IsOnboard() && crossSquare.Equals(board.EnPassantSquare))
{
moves.Add(new EnPassant(board, this, crossSquare));
}
}
}
if (From.Rank == 7)//Check pawn promotions
{
upSquare = From.To(Coordinate.Directions.North);
if (upSquare.IsEmpty(board))
{
moves.AddRange(Promote.AllPossiblePromotions(board, this, upSquare));
}
var crossSquare = From.To(Coordinate.Directions.NorthEast);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.Black)
{
moves.AddRange(Promote.AllPossiblePromotions(board, this, crossSquare));
}
crossSquare = From.To(Coordinate.Directions.NorthWest);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.Black)
{
moves.AddRange(Promote.AllPossiblePromotions(board, this, crossSquare));
}
}
}
else // For black pawn
{
var downSquare = From.To(Coordinate.Directions.South);
if (downSquare.IsEmpty(board) && From.Rank != 2)
{
moves.Add(new Ordinary(board, this, downSquare));
var twoDownSquare = downSquare.To(Coordinate.Directions.South);
if (From.Rank == 7 && twoDownSquare.IsEmpty(board))
{
moves.Add(new Ordinary(board, this, twoDownSquare));
}
}
if (From.Rank != 2)
{
var crossSquare = From.To(Coordinate.Directions.SouthEast);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.White)
{
moves.Add(new Ordinary(board, this, crossSquare));
}
crossSquare = From.To(Coordinate.Directions.SouthWest);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.White)
{
moves.Add(new Ordinary(board, this, crossSquare));
}
}
if (From.Rank == 4)
{
var crossSquare = From.To(Coordinate.Directions.SouthEast);
if (crossSquare.IsOnboard() && crossSquare.Equals(board.EnPassantSquare))
{
moves.Add(new EnPassant(board, this, crossSquare));
}
else
{
crossSquare = From.To(Coordinate.Directions.SouthWest);
if (crossSquare.IsOnboard() && crossSquare.Equals(board.EnPassantSquare))
{
moves.Add(new EnPassant(board, this, crossSquare));
}
}
}
if (From.Rank == 2)
{
downSquare = From.To(Coordinate.Directions.South);
if (downSquare.IsEmpty(board))
{
moves.AddRange(Promote.AllPossiblePromotions(board, this, downSquare));
}
var crossSquare = From.To(Coordinate.Directions.SouthEast);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.White)
{
moves.AddRange(Promote.AllPossiblePromotions(board, this, crossSquare));
}
crossSquare = From.To(Coordinate.Directions.SouthWest);
if (crossSquare.IsOnboard() && !crossSquare.IsEmpty(board) && crossSquare.GetPiece(board).Color == Color.White)
{
moves.AddRange(Promote.AllPossiblePromotions(board, this, crossSquare));
}
}
}
return(moves);
}