Ichthyostega
6de24bc7f0
to carry out that rather obvious step, I was bound to consider all the implications of choosing a given layout and handling pattern for our external structure representation. Finally, I settled upon the following decisions - the value space represented within the DataCap is flat, not further structured - the distinction between "attribute" and "nested object" is merely conceptual and will be enforced solely by the diff detection / representation protocol - basically, a nested subtree may appear as an attribute; the difference between attributes and children lies solely in the way of access and referral: by-name vs. positional - it is pointless to save space for the representation of the discriminator ID - but we can omit any further explicit type tag, because - we do *not* support programming by switch-on-type, and thus - we do *not* support full introspection, only a passive type-safety check - this is *not* a limitation, since we acknowledge that GenNode is a *Monad* - and the partial function needed within any flatMap implementation maps naturally onto our Variant-Visitor; thus - the DataCap can basically just *be* a Variant - and GenNode has just to supply the neccessary shaffolding to turn that into a full fledged Monad implementation, including direct construction by wrapping a value and flatMap with tree walk
146 lines
3.4 KiB
C++
146 lines
3.4 KiB
C++
/*
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GenericTreeMutator(Test) - customisable intermediary to abstract tree changing operations
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Copyright (C) Lumiera.org
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2015, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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#include "lib/test/run.hpp"
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#include "lib/test/test-helper.hpp"
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#include "lib/diff/tree-mutator.hpp"
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#include "lib/util.hpp"
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//#include <utility>
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#include <string>
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//#include <vector>
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#include <iostream>
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using util::isnil;
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using std::string;
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//using std::vector;
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//using std::swap;
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using std::cout;
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using std::endl;
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using lib::test::showType;
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using lib::test::demangleCxx;
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namespace lib {
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namespace diff{
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namespace test{
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// using lumiera::error::LUMIERA_ERROR_LOGIC;
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namespace {//Test fixture....
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}//(End)Test fixture
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/*****************************************************************************//**
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* @test Demonstrate a customisable component for flexible bindings
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* to enable generic tree changing and mutating operations to
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* arbitrary hierarchical data structures.
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*
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* @see TreeMutator
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* @see GenNodeBasic_test
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* @see GenNodeBasic_test
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* @see GenericTreeRepresentation_test
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*/
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class GenericTreeMutator_test : public Test
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{
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virtual void
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run (Arg)
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{
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simpleAttributeBinding();
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verifySnapshot();
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sequenceIteration();
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duplicateDetection();
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copy_and_move();
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}
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void
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simpleAttributeBinding()
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{
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string localData;
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auto mutator =
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TreeMutator::build()
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.change("something", [&](string val)
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{
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cout << "Oink-Oink"<<endl;
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localData = "Oink-Oink";
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})
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.change("something", [&](string val)
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{
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cout << "Change closure invoked with val="<<val<<endl;
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localData = val;
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});
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cout << "concrete TreeMutator type="<< demangleCxx (showType (mutator)) <<endl;
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CHECK (isnil (localData));
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Attribute testAttribute(string ("boing"));
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mutator.setAttribute ("zoing", testAttribute);
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CHECK (!isnil (localData));
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cout << "localData changed to:"<<localData<<endl;
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}
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void
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verifySnapshot()
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{
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}
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void
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sequenceIteration()
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{
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}
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void
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duplicateDetection()
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{
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}
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void
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copy_and_move()
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{
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}
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};
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/** Register this test class... */
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LAUNCHER (GenericTreeMutator_test, "unit common");
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}}} // namespace lib::diff::test
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