void GenerateCode(Node node, Parser.AssignmentStatement statement)
{
// Is it a straight assignment?
if (statement.operation == TokenType.EqualToOrAssign)
{
// Evaluate the expression, which will result in a value
// on the stack
GenerateCode(node, statement.valueExpression);
// Stack now contains [destinationValue]
}
else
{
// It's a combined operation-plus-assignment
// Get the current value of the variable
Emit(node, ByteCode.PushVariable, statement.destinationVariableName);
// Evaluate the expression, which will result in a value
// on the stack
GenerateCode(node, statement.valueExpression);
// Stack now contains [currentValue, expressionValue]
switch (statement.operation)
{
case TokenType.AddAssign:
Emit(node, ByteCode.CallFunc, TokenType.Add.ToString());
break;
case TokenType.MinusAssign:
Emit(node, ByteCode.CallFunc, TokenType.Minus.ToString());
break;
case TokenType.MultiplyAssign:
Emit(node, ByteCode.CallFunc, TokenType.Multiply.ToString());
break;
case TokenType.DivideAssign:
Emit(node, ByteCode.CallFunc, TokenType.Divide.ToString());
break;
default:
throw new ArgumentOutOfRangeException();
}
// Stack now contains [destinationValue]
}
// Store the top of the stack in the variable
Emit(node, ByteCode.StoreVariable, statement.destinationVariableName);
// Clean up the stack
Emit(node, ByteCode.Pop);
}
// Assigns a value to a variable.
private void RunAssignmentStatement(Parser.AssignmentStatement assignment)
{
// The place where we're stickin' this value.
var variableName = assignment.destinationVariableName;
// The value that's going into this variable.
// TODO: Currently this coerces this into a float. Add support for
// storing different types of data in the client.
var computedValue = EvaluateExpression(assignment.valueExpression).AsNumber;
// The current value of this variable.
float originalValue = dialogue.continuity.GetNumber(variableName);
// What shall we do with it?
// TODO: Hmm this should be a function, like the other operators
float finalValue = 0.0f;
switch (assignment.operation)
{
case TokenType.EqualToOrAssign:
finalValue = computedValue;
break;
case TokenType.AddAssign:
finalValue = originalValue + computedValue;
break;
case TokenType.MinusAssign:
finalValue = originalValue - computedValue;
break;
case TokenType.MultiplyAssign:
finalValue = originalValue * computedValue;
break;
case TokenType.DivideAssign:
finalValue = originalValue / computedValue;
break;
}
dialogue.LogDebugMessage(string.Format("Set {0} to {1}", variableName, finalValue));
dialogue.continuity.SetNumber(variableName, finalValue);
}
// Assigns a value to a variable.
private void RunAssignmentStatement(Parser.AssignmentStatement assignment)
{
// The place where we're stickin' this value.
var variableName = assignment.destinationVariableName;
// The value that's going into this variable.
var computedValue = EvaluateExpression(assignment.valueExpression);
// The current value of this variable.
Value originalValue = dialogue.continuity.GetValue(variableName);
// What shall we do with it?
Value finalValue = Value.NULL;
switch (assignment.operation)
{
case TokenType.EqualToOrAssign:
finalValue = computedValue;
break;
case TokenType.AddAssign:
finalValue = originalValue + computedValue;
break;
case TokenType.MinusAssign:
finalValue = originalValue - computedValue;
break;
case TokenType.MultiplyAssign:
finalValue = originalValue * computedValue;
break;
case TokenType.DivideAssign:
finalValue = originalValue / computedValue;
break;
}
dialogue.LogDebugMessage(string.Format("Set {0} to {1}", variableName, finalValue));
dialogue.continuity.SetValue(variableName, finalValue);
}
