/*
  DiffListApplication(Test)  -  demonstrate linearised representation of list diffs

   Copyright (C)
     2014,            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.

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

/** @file diff-list-application-test.cpp
 ** unit test \ref DiffListApplication_test
 */


#include "lib/test/run.hpp"
#include "lib/diff/list-diff-application.hpp"
#include "lib/iter-adapter-stl.hpp"
#include "lib/util.hpp"

#include <string>
#include <vector>

using lib::iter_stl::snapshot;
using util::isnil;
using std::string;
using std::vector;


namespace lib {
namespace diff{
namespace test{
  
  namespace {//Test fixture....
    
    using DataSeq = vector<string>;
    
    #define TOK(id) id(STRINGIFY(id))
    
    string TOK(a1), TOK(a2), TOK(a3), TOK(a4), TOK(a5);
    string TOK(b1), TOK(b2), TOK(b3), TOK(b4);
    
    using Interpreter = ListDiffInterpreter<string>;
    using DiffStep = ListDiffLanguage<string>::DiffStep;
    using DiffSeq = iter_stl::IterSnapshot<DiffStep>;
    
    DiffStep_CTOR(ins);
    DiffStep_CTOR(del);
    DiffStep_CTOR(pick);
    DiffStep_CTOR(find);
    DiffStep_CTOR(skip);
    
    
    inline DiffSeq
    generateTestDiff()
    {
      return snapshot({del(a1)
                     , del(a2)
                     , ins(b1)
                     , pick(a3)
                     , find(a5)
                     , ins(b2)
                     , ins(b3)
                     , pick(a4)
                     , skip(a5)
                     , ins(b4)
                     });
    }
  }//(End)Test fixture
  
  
  
  
  
  
  
  
  
  /***********************************************************************//**
   * @test Demonstration/Concept: a description language for list differences.
   *       The representation is given as a linearised sequence of verb tokens.
   *       This test demonstrates the application of such a diff representation
   *       to a given source list, transforming this list to hold the intended
   *       target list contents.
   *       
   * @see DiffListGeneration_test
   * @see DiffTreeApplication_test
   * @see VerbFunctionDispatch_test
   */
  class DiffListApplication_test : public Test
    {
      
      virtual void
      run (Arg)
        {
          DataSeq src({a1,a2,a3,a4,a5});
          DiffSeq diff = generateTestDiff();
          CHECK (!isnil (diff));
          
          DataSeq target = src;
          DiffApplicator<DataSeq> application(target);
          application.consume(diff);
          
          CHECK (isnil (diff));
          CHECK (!isnil (target));
          CHECK (src != target);
          CHECK (target == DataSeq({b1,a3,a5,b2,b3,a4,b4}));
        }
    };
  
  
  /** Register this test class... */
  LAUNCHER (DiffListApplication_test, "unit common");
  
  
  
}}} // namespace lib::diff::test