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Navigator: res-structure inheritance chain to allow passing current position

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we need to layer our Navigator implementation on top,
since this object needs to capture a reference to the "current position".

This is necessary to be able to derive the child position by extending
and then to form a child navigator -- which is the essence of
implementing expandChildren()
This commit is contained in:
Fischlurch 2017-12-26 03:51:02 +01:00
parent 30a90166fb
commit c007fbda43
1 changed files with 25 additions and 10 deletions
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35
src/gui/interact/gen-node-location-query.hpp
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@ -156,7 +156,8 @@ namespace interact {
% depth
% path
);
return childSequence(node, depth);
return TreeStructureNavigator::buildIterator(
childNavigator (node, depth));
}
private:
@ -217,34 +218,48 @@ namespace interact {
}
template<class PAR>
class GenNodeNavigator
: public TreeStructureNavigator
: public PAR
{
Rec const& pos_;
size_t depth_;
virtual TreeStructureNavigator*
expandChildren() const override
{
UNIMPLEMENTED ("build an iterator to yield the children. This requires to remember who we are ourselves.");
}
public:
template<class IT>
GenNodeNavigator(Rec const& node, size_t depth, IT&& rawChildIter)
: PAR{forward<IT> (rawChildIter)}
, pos_{node}
, depth_{depth}
{ }
};
template<class IT>
static auto
expandableIterSource(IT && rawIterator)
static TreeStructureNavigator*
buildNavigator (Rec const& node, size_t depth, IT && rawIterator)
{
return TreeStructureNavigator::buildIterator(
new lib::WrappedLumieraIter<IT, GenNodeNavigator> {forward<IT> (rawIterator)});
return new GenNodeNavigator<
lib::WrappedLumieraIter<IT,
TreeStructureNavigator>> {node, depth, forward<IT> (rawIterator)};
}
static ChildIter
childSequence (Rec const& node, size_t& depth)
static TreeStructureNavigator*
childNavigator (Rec const& node, size_t depth)
{
//////////////////////////////////////////////////////////////////////////TICKET #1113 : capturing the string into the global Symbol table becomes obsolete, once GenNode exposes Literal as ID
auto internedString = [](string const& id) -> Literal
{
return Symbol{id};
};
return depth==UIC_PERSP? expandableIterSource(singleValIterator (internedString (node.getType())))
: expandableIterSource(transformIterator (node.keys(), internedString));
return depth==UIC_PERSP? buildNavigator (node, depth, singleValIterator (internedString (node.getType())))
: buildNavigator (node, depth, transformIterator (node.keys(), internedString));
}
};