tests/unit-tests/FindPureLiterals_Test.cpp

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#include "stp/cpp_interface.h"
#include "stp/Parser/parser.h"
#include "stp/Simplifier/FindPureLiterals.h"
#include <gtest/gtest.h>
#include <stdio.h>


  const std::string start_input = R"(
  (set-logic QF_BV)
  (set-info :smt-lib-version 2.0)
  (set-info :category "check")
  (set-info :status sat)

  (declare-fun v0 () (_ BitVec 20))
  (declare-fun v1 () (_ BitVec 20))
  (declare-fun v2 () (_ BitVec 20))
  (declare-fun v3 () (_ BitVec 20))
  (declare-fun v4 () (_ BitVec 20))

  (declare-fun x0 () (_ BitVec 1))

  (declare-fun a () Bool)
  (declare-fun b () Bool)
  (declare-fun c () Bool)
  (declare-fun d () Bool)

  (push 1)
  )";

struct Context
{
   stp::STPMgr mgr;
   SimplifyingNodeFactory snf;
   stp::Cpp_interface interface;
   stp::SubstitutionMap substitutionMap;
   stp::Simplifier simplifier;

   Context() :
   snf (*(mgr.hashingNodeFactory), mgr),
   interface(mgr, &snf),
   substitutionMap(&mgr),
   simplifier(&mgr,&substitutionMap)

   { 
    mgr.defaultNodeFactory = &snf;
    interface.startup();
    stp::GlobalParserBM = &mgr;
    stp::GlobalParserInterface = &interface;
   }

   ASTNode process(std::string input)
   {
      stp::SMT2ScanString((start_input + input).c_str());
      stp::SMT2Parse();
      // TODO assert it was parsed properly.
      smt2lex_destroy();
      ASTNode n = mgr.CreateNode(stp::AND, mgr.GetAsserts());
      stp::FindPureLiterals find;
      const auto changed = find.topLevel(n, &simplifier, &mgr);

      if (changed)
      {
        n = simplifier.applySubstitutionMap(n);
        simplifier.haveAppliedSubstitutionMap();
      }
      return n;
    }
};


TEST(FindPureLiterals_Test, a)
{
  const std::string input = R"(
    (assert (and a a a a) )
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.ASTTrue);
}

TEST(FindPureLiterals_Test, a0)
{
  const std::string input = R"(
    (assert (and a b) )
    (assert (and a c) )
    (assert (or b (not c)))
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.LookupOrCreateSymbol("c"));
}


TEST(FindPureLiterals_Test, b)
{
  const std::string input = R"(
    (assert (or a b) )
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.ASTTrue);
}

TEST(FindPureLiterals_Test, c)
{
  const std::string input = R"(
    (assert (ite a (or b c) (or c d) ))
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.ASTTrue);
}

TEST(FindPureLiterals_Test, c0)
{
  const std::string input = R"(
    (assert (ite a (not b) (or c d) ))
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.ASTTrue);
}

TEST(FindPureLiterals_Test, c1)
{
  const std::string input = R"(
    (assert  (ite b (not b) (or c d) ))
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.CreateNode(stp::NOT, c.mgr.LookupOrCreateSymbol("b")));
}

TEST(FindPureLiterals_Test, c2)
{
  const std::string input = R"(
    (assert  (not (ite a (not b) (or c d) )))
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.ASTTrue);
}


TEST(FindPureLiterals_Test, d)
{
  const std::string input = R"(
    (assert (or a b) )
    (assert (or a c) )
    (assert (or a d) )
    (assert (or a (not b)) )
    (assert (or a (not c)) )
    (assert (or a (not d)) )
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.ASTTrue);
}

TEST(FindPureLiterals_Test, e)
{
  const std::string input = R"(
    (assert (or (not a) b) )
    (assert (or (not a) (not b) ) )
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.ASTTrue);
}