void LazyFunction::apply(Expr& target, ListNode* args, Environment* rho)
{
// number of args should match definition
ListNode* anames = argNames_;
if (anames->length() != args->length())
{
error("argument length mismatch");
return;
}
// convert arguments into thunks
ListNode* newargs = makeThunks(args, rho);
// make new environment
Environment* newrho = new Environment(anames, newargs, context_);
// evaluate body in new environment
if (body_())
{
body_()->eval(target, valueOps, newrho);
}
else
{
target = 0;
}
newrho = 0;
}
/// APLCatenationFunctionApply
void CatenationFunction::applyOp
(
Expr& target,
APLValue* left,
APLValue* right
)
{
ListNode* lshape = left->shape();
ListNode* rshape = right->shape();
int llen = lshape->length();
int rlen = rshape->length();
if (llen <= 0 || (llen != rlen))
{
target = error("catenation conformability error");
return;
}
// get the size of the last row in each structure
int lrow, rrow;
IntegerExpression* ie = lshape->at(llen - 1)->isInteger();
if (ie)
{
lrow = ie->val();
}
else
{
lrow = 1;
}
ie = rshape->at(rlen - 1)->isInteger();
if (ie)
{
rrow = ie->val();
}
else
{
rrow = 1;
}
// build up the new size
int extent = lrow + rrow;
ListNode* newShape =
new ListNode(new IntegerExpression(extent), emptyList());
llen = llen - 1;
while (--llen >= 0)
{
newShape = new ListNode(lshape->at(llen), newShape);
ie = lshape->at(llen)->isInteger();
if (ie)
{
extent *= ie->val();
}
}
APLValue* newval = new APLValue(newShape, extent);
// now build the new values
int i, index, lindex, rindex;
index = lindex = rindex = 0;
while (index < extent)
{
for (i = 0; i < lrow; i++)
{
newval->atPut(index++, left->at(lindex++));
}
for (i = 0; i < rrow; i++)
{
newval->atPut(index++, right->at(rindex++));
}
}
target = newval;
}
