public FixPoint GetVariable(ExpressionVariable variable, int index)
{
if (m_context == null)
{
return(FixPoint.Zero);
}
int vid = variable[index];
if (vid == ExpressionVariable.VID_BTContext)
{
if (index + 1 == variable.MaxIndex)
{
return(m_context.GetData(variable[index + 1]));
}
}
else
{
IExpressionVariableProvider provider = m_context.GetData <IExpressionVariableProvider>(BTContextKey.ExpressionVariableProvider);
if (provider != null)
{
return(provider.GetVariable(variable, index));
}
}
return(FixPoint.Zero);
}
public FixPoint Evaluate(IExpressionVariableProvider variable_provider)
{
if (m_program != null)
{
return(m_program.Evaluate(variable_provider));
}
else
{
return(m_constant);
}
}
public FixPoint ComputeValue(IExpressionVariableProvider variable_provider)
{
return(m_formula.Evaluate(variable_provider));
}
public virtual FixPoint Evaluate(IExpressionVariableProvider variable_provider)
{
Stack <FixPoint> stack = new Stack <FixPoint>();
FixPoint var1, var2, var3;
int index = 0;
int total_count = m_instructions.Count;
while (index < total_count)
{
OperationCode op_code = (OperationCode)m_instructions[index];
++index;
switch (op_code)
{
case OperationCode.PUSH_NUMBER:
stack.Push(FixPoint.CreateFromRaw(m_instructions[index]));
++index;
break;
case OperationCode.PUSH_VARIABLE:
if (variable_provider != null)
{
var1 = variable_provider.GetVariable(m_variables[(int)m_instructions[index]], 0);
stack.Push(var1);
}
else
{
stack.Push(FixPoint.Zero);
}
++index;
break;
case OperationCode.NEGATE:
var1 = stack.Pop();
stack.Push(-var1);
break;
case OperationCode.ADD:
var2 = stack.Pop();
var1 = stack.Pop();
stack.Push(var1 + var2);
break;
case OperationCode.SUBTRACT:
var2 = stack.Pop();
var1 = stack.Pop();
stack.Push(var1 - var2);
break;
case OperationCode.MULTIPLY:
var2 = stack.Pop();
var1 = stack.Pop();
stack.Push(var1 * var2);
break;
case OperationCode.DIVIDE:
var2 = stack.Pop();
var1 = stack.Pop();
stack.Push(var1 / var2);
break;
case OperationCode.SIN:
var1 = stack.Pop();
stack.Push(FixPoint.Sin(var1));
break;
case OperationCode.COS:
var1 = stack.Pop();
stack.Push(FixPoint.Cos(var1));
break;
case OperationCode.TAN:
var1 = stack.Pop();
stack.Push(FixPoint.Tan(var1));
break;
case OperationCode.SQRT:
var1 = stack.Pop();
stack.Push(FixPoint.Sqrt(var1));
break;
case OperationCode.MIN:
var2 = stack.Pop();
var1 = stack.Pop();
stack.Push(FixPoint.Min(var1, var2));
break;
case OperationCode.MAX:
var2 = stack.Pop();
var1 = stack.Pop();
stack.Push(FixPoint.Max(var1, var2));
break;
case OperationCode.CLAMP:
var3 = stack.Pop();
var2 = stack.Pop();
var1 = stack.Pop();
stack.Push(FixPoint.Clamp(var1, var2, var3));
break;
case OperationCode.EQUAL:
var2 = stack.Pop();
var1 = stack.Pop();
if (var1 == var2)
{
stack.Push(FixPoint.One);
}
else
{
stack.Push(FixPoint.Zero);
}
break;
case OperationCode.NOT_EQUAL:
var2 = stack.Pop();
var1 = stack.Pop();
if (var1 != var2)
{
stack.Push(FixPoint.One);
}
else
{
stack.Push(FixPoint.Zero);
}
break;
case OperationCode.GREATER:
var2 = stack.Pop();
var1 = stack.Pop();
if (var1 > var2)
{
stack.Push(FixPoint.One);
}
else
{
stack.Push(FixPoint.Zero);
}
break;
case OperationCode.GREATER_EQUAL:
var2 = stack.Pop();
var1 = stack.Pop();
if (var1 >= var2)
{
stack.Push(FixPoint.One);
}
else
{
stack.Push(FixPoint.Zero);
}
break;
case OperationCode.LESS:
var2 = stack.Pop();
var1 = stack.Pop();
if (var1 < var2)
{
stack.Push(FixPoint.One);
}
else
{
stack.Push(FixPoint.Zero);
}
break;
case OperationCode.LESS_EQUAL:
var2 = stack.Pop();
var1 = stack.Pop();
if (var1 <= var2)
{
stack.Push(FixPoint.One);
}
else
{
stack.Push(FixPoint.Zero);
}
break;
case OperationCode.AND:
var2 = stack.Pop();
var1 = stack.Pop();
if (var1 != FixPoint.Zero && var2 != FixPoint.Zero)
{
stack.Push(FixPoint.One);
}
else
{
stack.Push(FixPoint.Zero);
}
break;
case OperationCode.OR:
var2 = stack.Pop();
var1 = stack.Pop();
if (var1 != FixPoint.Zero || var2 != FixPoint.Zero)
{
stack.Push(FixPoint.One);
}
else
{
stack.Push(FixPoint.Zero);
}
break;
case OperationCode.NOT:
var1 = stack.Pop();
if (var1 == FixPoint.Zero)
{
stack.Push(FixPoint.One);
}
else
{
stack.Push(FixPoint.Zero);
}
break;
case OperationCode.AND_BITWISE:
var2 = stack.Pop();
var1 = stack.Pop();
stack.Push(var1 & var2);
break;
case OperationCode.OR_BITWISE:
var2 = stack.Pop();
var1 = stack.Pop();
stack.Push(var1 | var2);
break;
case OperationCode.CONDITIONAL_EXPRESSION:
var3 = stack.Pop();
var2 = stack.Pop();
var1 = stack.Pop();
if (var1 != FixPoint.Zero)
{
stack.Push(var2);
}
else
{
stack.Push(var3);
}
break;
default:
break;
}
}
return(stack.Pop());
}