protected FuncDrawOperation(Player player, Command cmd)
: base(player)
{
string strFunc = cmd.Next();
if (string.IsNullOrWhiteSpace(strFunc))
{
player.Message("&WEmpty function expression");
return;
}
if (strFunc.Length < 3)
{
player.Message("&WExpression is too short (should be like z=f(x,y))");
return;
}
strFunc = strFunc.ToLower();
_vaxis = GetAxis(SimpleParser.PreparseAssignment(ref strFunc));
_expression = SimpleParser.Parse(strFunc, GetVarArray(_vaxis));
Player.Message("Expression parsed as "+_expression.Print());
string scalingStr=cmd.Next();
_scaler = new Scaler(scalingStr);
}
public static Expression[] GetPlayerParametrizationCoordsStorage( Player p )
{
Object o;
if ( !p.PublicAuxStateObjects.TryGetValue( CoordsStorageName, out o ) ) {
o = new Expression[3];
p.PublicAuxStateObjects.Add( CoordsStorageName, o );
}
return ( Expression[] )o;
}
public InequalityDrawOperation( Player player, Command cmd )
: base(player)
{
string strFunc = cmd.Next();
if ( string.IsNullOrWhiteSpace( strFunc ) )
throw new ArgumentException( "empty inequality expression" );
if ( strFunc.Length < 3 )
throw new ArgumentException( "expression is too short (should be like f(x,y,z)>g(x,y,z))" );
strFunc = strFunc.ToLower();
_expression = SimpleParser.Parse( strFunc, new string[] { "x", "y", "z" } );
if ( !_expression.IsInEquality() )
throw new ArgumentException( "the expression given is not an inequality (should be like f(x,y,z)>g(x,y,z))" );
player.Message( "Expression parsed as " + _expression.Print() );
string scalingStr = cmd.Next();
_scaler = new Scaler( scalingStr );
}
public EqualityDrawOperation( Player player, Command cmd )
: base(player)
{
string strFunc = cmd.Next();
if ( string.IsNullOrWhiteSpace( strFunc ) ) {
player.Message( "empty equality expression" );
return;
}
if ( strFunc.Length < 3 ) {
player.Message( "expression is too short (should be like f(x,y,z)=g(x,y,z))" );
return;
}
strFunc = strFunc.ToLower();
_expression = SimpleParser.ParseAsEquality( strFunc, new string[] { "x", "y", "z" } );
player.Message( "Expression parsed as " + _expression.Print() );
string scalingStr = cmd.Next();
_scaler = new Scaler( scalingStr );
}
private static void ProcessOperator(FuncData op, Expression e, Stack<FuncData> tmpStack)
{
while (tmpStack.Count>0) //while operators with higher or equal precedence
{
FuncData fd = tmpStack.Peek();
if (fd.SpecialKind == SpecialOperandKind.NotSpecial && !fd.IsFunctionOrUnary && fd.Precedence >= op.Precedence)
e.Append(tmpStack.Pop().Func);
else
break;
}
tmpStack.Push(op);
}
private static void ProcessRightParenth(Expression e, Stack<FuncData> tmpStack, int pos)
{
if (tmpStack.Count == 0)
throw new ArgumentException("unmatching right parenthesis at " + pos);
while (tmpStack.Peek().SpecialKind != SpecialOperandKind.LeftParenthesis)
{
e.Append(tmpStack.Pop().Func);
if (tmpStack.Count == 0)
throw new ArgumentException("unmatching right parenthesis at " + pos);
}
tmpStack.Pop(); //remove left parenthesis
while (tmpStack.Count > 0 && tmpStack.Peek().IsFunctionOrUnary) //append function/unary minus or both
e.Append(tmpStack.Pop().Func);
}
private static void ProcessComma(Expression e, Stack<FuncData> tmpStack, int pos)
{
if (tmpStack.Count==0)
throw new ArgumentException("comma without left parenthesis at " + pos);
while (tmpStack.Peek().SpecialKind!=SpecialOperandKind.LeftParenthesis)
{
e.Append(tmpStack.Pop().Func);
if (tmpStack.Count == 0)
throw new ArgumentException("comma without left parenthesis at " + pos);
}
}
public static Expression Parse(string expression, IEnumerable<string> vars)
{
expression.ToLower();
int pos = 0;
Stack<FuncData> tmpStack=new Stack<FuncData>();
Expression e=new Expression(vars);
bool noBOperatorExpected = true;
bool lParenthExpected = false;
while (pos<expression.Length)
{
string term = ReadTerm(expression, ref pos);
if (lParenthExpected && term!="(")
throw new ArgumentException("expected '(' at "+pos);
lParenthExpected = false; //checked, can be turn off
//if a number or const or variable, append to the expression
double num;
if (double.TryParse(term, out num)) //number
{
e.Append(new Variable() {Value = num, Name=num.ToString()});
noBOperatorExpected = false;
continue;
}
IExpressionElement el;
if (_consts.TryGetValue(term, out el)) //const
{
e.Append(el);
noBOperatorExpected = false;
continue;
}
Variable v;
if (e.Vars.TryGetValue(term, out v)) //variable
{
e.Append(v);
noBOperatorExpected = false;
continue;
}
//if function -> push to stack
FuncData fd;
if (_functions.TryGetValue(term, out fd))
{
tmpStack.Push(fd);
lParenthExpected = true; //dont need to set/reset noBOperatorExpected
continue;
}
if (term.Length == 1) //operators
{
char termch = term[0];
if (_soperators.TryGetValue(termch, out fd))
{
switch (fd.SpecialKind)
{
case SpecialOperandKind.LeftParenthesis:
tmpStack.Push(fd);
noBOperatorExpected = true;
break;
case SpecialOperandKind.RightParenthesis:
noBOperatorExpected = false;
ProcessRightParenth(e, tmpStack, pos);
break;
case SpecialOperandKind.Comma:
noBOperatorExpected = true;
ProcessComma(e, tmpStack, pos);
break;
}
continue;
}
if (noBOperatorExpected)
{
if (_uoperators.TryGetValue(termch, out fd))
{
tmpStack.Push(fd);
//noBOperatorExpected = true; - is already
continue;
}
}
else
{
if(_operators.TryGetValue(termch, out fd))
{
ProcessOperator(fd, e, tmpStack);
noBOperatorExpected = true;
continue;
}
}
}
//unrecongnizable
throw new ArgumentException("unrecognizable term " + term + " at before " + pos);
}
//we will be tolerant to closing parenthesis, i.e. the left parenthesis left will be ignored
foreach (var f in tmpStack)
if (f.SpecialKind!=SpecialOperandKind.LeftParenthesis)
e.Append(f.Func);
else
throw new ArgumentException("unmatching parenthesis");
return e;
}