/**
* Evaluate the content of this syntax element. This will perform
* a multiplication assignment operation.
*/
RevPtr<Variable> SyntaxMultiplicationAssignment::evaluateContent( Environment& env )
{
#ifdef DEBUG_PARSER
printf( "Evaluating multiplication assignment\n" );
#endif
// Get variable from lhs. We use standard evaluation because the variable is
// implicitly on both sides (lhs and rhs) of this type of statement
RevPtr<Variable> theVariable = lhsExpression->evaluateContent( env );
if ( theVariable == NULL )
throw RbException( "Invalid NULL variable returned by lhs expression in multiplication assignment" );
// Make sure that the variable is constant
if ( !theVariable->getRevObject().isConstant() )
throw RbException( "Invalid multiplication assignment to dynamic variable" );
// Record whether it is a control variable
bool isControlVar = theVariable->isControlVar();
// Get a reference to the lhs value object
const RevObject& lhs_value = theVariable->getRevObject();
// Evaluate the rhs expression
const RevPtr<Variable>& rhs = rhsExpression->evaluateContent( env );
if ( rhs == NULL )
throw RbException( "Invalid NULL variable returned by rhs expression in multiplication assignment" );
// Get a reference to the rhs value object
const RevObject& rhs_value = rhs->getRevObject();
// Generate result of the multiplication
RevObject *newValue = lhs_value.multiply( rhs_value );
// Fill the slot with the new variable
theVariable->setRevObject( newValue );
// Reset it as control variable, if it was a control variable before the assignment.
// When we fill the slot, the control variable property is reset to false by default.
if ( isControlVar )
theVariable->setControlVarState( true );
#ifdef DEBUG_PARSER
env.printValue(std::cerr);
#endif
// Return the variable for further assignment
return theVariable;
}
/**
* @brief Evaluate dynamic rhs content
*
* This function returns the semantic value of the variable expression
* when it is part of a dynamic expression, that is, the right-hand side
* of an equation (deterministic) or tilde (stochastic) assignment.
*
* It differs from the standard evaluateContent() in several ways. First,
* control variables need to return clones of themselves (temporary
* variables) rather than themselves, so that they are not included in
* the DAG. Second, we cannot compute a static index for indexed variables.
* Instead, we need to deliver an index conisting of variables resulting
* from dynamic evaluation of the index variables. These need to be put
* in a dynamic lookup variable.
*/
RevPtr<Variable> SyntaxVariable::evaluateDynamicContent( Environment& env)
{
RevPtr<Variable> theVar;
if ( baseVariable == NULL )
{
if ( functionCall != NULL )
{
// Get the dynamic return variable of the function call
theVar = functionCall->evaluateDynamicContent( env );
}
else if ( expression != NULL )
{
// Get the dynamic return variable of the expression
theVar = expression->evaluateDynamicContent( env );
}
else
{
// Get variable from the environment (no dynamic version of identifier)
theVar = env.getVariable( identifier );
}
}
else
{
// Note that the function call is always NULL if there is
// a base variable, because any variables that are base to
// the function call are handled by the function call. Note
// also that generic expressions can only occur in base
// variables, so we need not worry about any expression if
// we are not a base variable.
// Get the base variable
theVar = baseVariable->evaluateDynamicContent( env );
// Find member variable (no dynamic version of identifier)
theVar = theVar->getRevObject().getMember( identifier );
}
// Get dynamic index
std::vector< RevPtr<Variable> > oneOffsetIndexVars = computeDynamicIndex( env );
// Check if we need a dynamic lookup
bool dynamicLookup = false;
for ( std::vector< RevPtr<Variable> >::iterator it = oneOffsetIndexVars.begin(); it != oneOffsetIndexVars.end(); ++it )
{
if ( (*it)->getRevObject().hasDagNode() && (*it)->isAssignable() )
{
dynamicLookup = true;
break;
}
}
// If the variable we are looking up things in does not have a DAG node, we do not need a dynamic lookup regardless
// If it does have a DAG node, we need a dynamic lookup if it is named, regardless of whether we have constant indices
if ( theVar->getRevObject().hasDagNode() == false )
dynamicLookup = false;
else if ( theVar->isAssignable() )
dynamicLookup = true;
// Get dynamic element from container or subscript operator
while ( !oneOffsetIndexVars.empty() )
{
// Get the element...
if ( theVar->getRevObject().isTypeSpec( Container::RevObject::getClassTypeSpec() ) )
{
// ... from a container
// Get the container index variables
std::vector< RevPtr<Variable> > containerOneOffsetIndexVars;
for ( size_t i = 0; i < theVar->getRevObject().getDim(); ++i )
{
if ( !oneOffsetIndexVars.empty() )
{
containerOneOffsetIndexVars.push_back( oneOffsetIndexVars[0] );
oneOffsetIndexVars.erase( oneOffsetIndexVars.begin() );
}
else
containerOneOffsetIndexVars.push_back( new Variable( new Natural( 0 ) ) );
}
if ( dynamicLookup )
{
// Make a dynamic element lookup
theVar = new Variable( theVar->getRevObject().makeElementLookup( theVar, containerOneOffsetIndexVars ) );
}
else
{
// We want a static element lookup
// Get the container indices statically
std::vector<size_t> containerOneOffsetIndices;
for ( size_t i = 0; i < containerOneOffsetIndexVars.size(); ++i )
{
containerOneOffsetIndices.push_back( getIndex( containerOneOffsetIndexVars[i], env ) );
}
// Get the element using the getElement function
theVar = theVar->getRevObject().getElement( containerOneOffsetIndices );
}
}
else
{
// ... or from a subscript operator
// Note that we do not name the element here; either the member object gives out
// a variable it names itself, or it gives out a temporary variable copy, which
// should not be named
// Create the single argument for the index operator (statically always for now)
std::vector<Argument> args;
args.push_back( Argument( new Variable( new Natural( getIndex( oneOffsetIndexVars[0], env ) ) ) ) );
// Get the variable using the subscript operator function
// TODO: This needs to be made generic for user-defined member objects
// TODO: This needs to check that there is a subscript operator function and not procedure,
// and then return a dynamic element lookup
theVar = theVar->getRevObject().executeMethod( "[]", args );
// Erase the index
oneOffsetIndexVars.erase( oneOffsetIndexVars.begin() );
}
}
// Check whether we have a control variable and make a clone in that case
if ( theVar->isControlVar() )
theVar = new Variable( theVar->getRevObject().clone() );
// Return the variable for assignment
return theVar;
}
