diff-ignore-changes-test.cpp

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/*
  DiffIgnoreChanges(Test)  -  apply diff to black hole

   Copyright (C)
     2018,            Hermann Vosseler <Ichthyostega@web.de>

  **Lumiera** is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by the
  Free Software Foundation; either version 2 of the License, or (at your
  option) any later version. See the file COPYING for further details.

* *****************************************************************/

#include "lib/test/run.hpp"
#include "lib/test/test-helper.hpp"
#include "lib/format-util.hpp"
#include "lib/diff/tree-diff-application.hpp"
#include "lib/diff/test-mutation-target.hpp"
#include "lib/format-string.hpp"
#include "lib/format-cout.hpp"
#include "lib/util.hpp"

#include <string>

using lib::iter_stl::snapshot;
using lib::time::Time;
using std::string;


namespace lib {
namespace diff{
namespace test{
  
  namespace {//Test fixture....
    
    // define some GenNode elements
    // to act as templates within the concrete diff
    // NOTE: everything in this diff language is by-value
    const GenNode ATTRIB1("α", 1),                         // attribute α = 1
                  ATTRIB2("β", int64_t(2)),                // attribute α = 2L   (int64_t)
                  ATTRIB3("γ", 3.45),                      // attribute γ = 3.45 (double)
                  TYPE_X("type", "ξ"),                     // a "magic" type attribute "Xi"
                  TYPE_Z("type", "ζ"),                     //
                  CHILD_A("a"),                            // unnamed string child node
                  CHILD_B('b'),                            // unnamed char child node
                  CHILD_T(Time(12,34,56,78)),              // unnamed time value child
                  SUB_NODE = MakeRec().genNode(),          // empty anonymous node used to open a sub scope
                  ATTRIB_NODE = MakeRec().genNode("δ"),    // empty named node to be attached as attribute δ
                  GAMMA_PI("γ", 3.14159265);               // happens to have the same identity (ID) as ATTRIB3
    
  }//(End)Test fixture
  
  using LERR_(DIFF_CONFLICT);
  
  
  
  
  
  /**************************************************************************/
  class DiffIgnoreChanges_test
    : public Test
    , TreeDiffLanguage
    {
      using DiffSeq = iter_stl::IterSnapshot<DiffStep>;
      
      DiffSeq
      populationDiff()
        {
          return snapshot({ins(ATTRIB1)
                         , ins(ATTRIB3)
                         , ins(ATTRIB3)
                         , ins(CHILD_B)
                         , ins(CHILD_B)
                         , ins(CHILD_T)
                         });
        }                // ==> ATTRIB1, ATTRIB3, (ATTRIB3), CHILD_B, CHILD_B, CHILD_T
      
      DiffSeq
      reorderingDiff()
        {
          return snapshot({after(Ref::ATTRIBS)
                         , ins(ATTRIB2)
                         , del(CHILD_B)
                         , ins(SUB_NODE)
                         , find(CHILD_T)
                         , pick(CHILD_B)
                         , skip(CHILD_T)
                         });
        }                // ==> ATTRIB1, ATTRIB3, (ATTRIB3), ATTRIB2, SUB_NODE, CHILD_T, CHILD_B
        
      DiffSeq
      mutationDiff()
        {
          return snapshot({after(CHILD_B)
                         , after(Ref::END)
                         , set(GAMMA_PI)
                         , mut(SUB_NODE)
                           , ins(TYPE_X)
                           , ins(ATTRIB2)
                           , ins(CHILD_B)
                           , ins(CHILD_A)
                         , emu(SUB_NODE)
                         , ins(ATTRIB_NODE)
                         , mut(ATTRIB_NODE)
                           , ins(TYPE_Z)
                           , ins(CHILD_A)
                           , ins(CHILD_A)
                           , ins(CHILD_A)
                         , emu(ATTRIB_NODE)
                         });
        }                // ==> ATTRIB1, ATTRIB3 := π, (ATTRIB3), ATTRIB2,
                         //     ATTRIB_NODE{ type ζ, CHILD_A, CHILD_A, CHILD_A }
                         //     SUB_NODE{ type ξ, ATTRIB2, CHILD_B, CHILD_A },
                         //     CHILD_T, CHILD_B
      
      
      
      
      virtual void
      run (Arg)
        {
          fail_or_ignore();
          fish_for_content();
        }
      
      
      void
      fail_or_ignore()
        {
          struct HappyBlackHole
            {
              bool diligent = true;
              
              void
              buildMutator (TreeMutator::Handle buff)
                {
                  if (diligent)
                    buff.emplace(
                      TreeMutator());
                  else
                    buff.emplace(
                      TreeMutator::build()
                        .ignoreAllChanges());
                }
            };
          
          HappyBlackHole subject;
          DiffApplicator<HappyBlackHole> application(subject);
          
          VERIFY_ERROR(DIFF_CONFLICT, application.consume(populationDiff()) );
          VERIFY_ERROR(DIFF_CONFLICT, application.consume(reorderingDiff()) );
          VERIFY_ERROR(DIFF_CONFLICT, application.consume(mutationDiff()) );
          
          subject.diligent = false;
          
          application.consume(populationDiff());
          application.consume(reorderingDiff());
          application.consume(mutationDiff());
        }
      
      
      void
      fish_for_content()
        {
          struct Scrounger
            {
              double loot = 0.0;
              
              void
              buildMutator (TreeMutator::Handle buff)
                {
                  buff.emplace (
                    TreeMutator::build()
                      .ignoreAllChanges()
                      .change("γ", [&](double val) { loot = val; }));
                }
            };
          
          Scrounger subject;
          DiffApplicator<Scrounger> application(subject);
          
          const auto NOTHING = 0.0;
          const auto VAL_1   = ATTRIB3.data.get<double>();
          const auto VAL_2   = GAMMA_PI.data.get<double>();
          
          CHECK (subject.loot == NOTHING);
          
          application.consume(populationDiff());
          CHECK (subject.loot == VAL_1);
          
          application.consume(reorderingDiff());
          CHECK (subject.loot == VAL_1);
          
          application.consume(mutationDiff());
          CHECK (subject.loot == VAL_2);
        }
      
    };
  
  
  LAUNCHER (DiffIgnoreChanges_test, "unit common");
  
  
  
}}} // namespace lib::diff::test