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//{{{  Banner                           

//============================================================================

//

//      conflict.cxx

//

//      The CdlConflict class

//

//============================================================================

//####COPYRIGHTBEGIN####

//                                                                          

// ----------------------------------------------------------------------------

// Copyright (C) 1999, 2000 Red Hat, Inc.

//

// This file is part of the eCos host tools.

//

// This program 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.

// 

// This program is distributed in the hope that it will be useful, but WITHOUT 

// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for 

// more details.

// 

// You should have received a copy of the GNU General Public License along with

// this program; if not, write to the Free Software Foundation, Inc., 

// 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

//

// ----------------------------------------------------------------------------

//                                                                          

//####COPYRIGHTEND####

//============================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):   bartv

// Contact(s):  bartv

// Date:        1999/01/28

// Version:     0.02

//

//####DESCRIPTIONEND####

//============================================================================

//}}}

//{{{  #include's                       

// ----------------------------------------------------------------------------

#include "cdlconfig.h"

// Get the infrastructure types, assertions, tracing and similar

// facilities.

#include <cyg/infra/cyg_ass.h>

#include <cyg/infra/cyg_trac.h>

// <cdlcore.hxx> defines everything implemented in this module.

// It implicitly supplies <string>, <vector> and <map> because

// the class definitions rely on these headers. It also brings

// in <tcl.h>

#include <cdlcore.hxx>

//}}}

//{{{  Statics                          

// ----------------------------------------------------------------------------

CYGDBG_DEFINE_MEMLEAK_COUNTER(CdlConflictBody);

CYGDBG_DEFINE_MEMLEAK_COUNTER(CdlConflict_UnresolvedBody);

CYGDBG_DEFINE_MEMLEAK_COUNTER(CdlConflict_IllegalValueBody);

CYGDBG_DEFINE_MEMLEAK_COUNTER(CdlConflict_EvalExceptionBody);

CYGDBG_DEFINE_MEMLEAK_COUNTER(CdlConflict_RequiresBody);

CYGDBG_DEFINE_MEMLEAK_COUNTER(CdlConflict_DataBody);

//}}}

//{{{  CdlConflict                      

//{{{  Creation and destruction                 

// ----------------------------------------------------------------------------

// The basic conflicts. Conflicts are created in the context of a transaction.

// If the transaction gets committed then they are transferred to a toplevel.

// If the transaction gets cancelled then they just disappear.

//

// A conflict that is only part of a transaction may go away as that

// transaction proceeds, in which case it can be deleted immediately.

// A conflict that is already part of the toplevel cannot be

// destroyed, instead it gets marked in the transaction object. Only

// when the transaction is committed does the object get deleted.

// In addition within the context of a transaction old conflicts

// may hang around for a while.

//

CdlConflictBody::CdlConflictBody(CdlTransaction trans_arg, CdlNode node_arg, CdlProperty property_arg, bool structural_arg)

{

    CYG_REPORT_FUNCNAME("CdlConflict:: constructor");

    CYG_REPORT_FUNCARG4XV(this, trans_arg, node_arg, property_arg);

    CYG_PRECONDITION_CLASSC(trans_arg);

    CYG_PRECONDITION_CLASSC(node_arg);

    CYG_PRECONDITION_CLASSC(property_arg);

    node        = node_arg;

    property    = property_arg;

    transaction = trans_arg;

    structural  = structural_arg;

    no_solution = false;

    // The vectors take care of themselves

    enabled     = true;

    reason      = "";

    transaction->dirty = true;

    if (structural_arg) {

        transaction->new_structural_conflicts.push_back(this);

    } else {

        transaction->new_conflicts.push_back(this);

    }

    cdlconflictbody_cookie      = CdlConflictBody_Magic;

    CYGDBG_MEMLEAK_CONSTRUCTOR();

    CYG_POSTCONDITION_THISC();

    CYG_REPORT_RETURN();

}

// ----------------------------------------------------------------------------

// The destructor can get invoked during a transaction commit, in the

// case of a global conflict, or from inside clear() for a per-transaction

// conflict. In all cases the calling code is responsible for removing

// the conflict from any STL containers.

CdlConflictBody::~CdlConflictBody()

{

    CYG_REPORT_FUNCNAME("CdlConflict:: destructor");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    cdlconflictbody_cookie      = CdlConflictBody_Invalid;

    reason                      = "";

    enabled                     = false;

    no_solution                 = false;

    solution.clear();

    solution_references.clear();

    structural                  = false;

    transaction                 = 0;

    property                    = 0;

    node                        = 0;

    CYGDBG_MEMLEAK_DESTRUCTOR();

    CYG_REPORT_RETURN();

}

//}}}

//{{{  Solution support                         

// ----------------------------------------------------------------------------

bool

CdlConflictBody::has_known_solution() const

{

    CYG_REPORT_FUNCNAMETYPE("CdlConflict::has_solution", "result %d");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    bool result = (0 != solution.size());

    CYG_REPORT_RETVAL(result);

    return result;

}

bool

CdlConflictBody::has_no_solution() const

{

    CYG_REPORT_FUNCNAMETYPE("CdlConflict::has_no_solution", "result %d");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    bool result = no_solution;

    CYG_REPORT_RETVAL(result);

    return result;

}

const std::vector<std::pair<CdlValuable, CdlValue> >&

CdlConflictBody::get_solution() const

{

    CYG_REPORT_FUNCNAME("CdlConflict::get_solution");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    CYG_REPORT_RETURN();

    return solution;

}

const std::set<CdlValuable>&

CdlConflictBody::get_solution_references() const

{

    CYG_REPORT_FUNCNAME("CdlConflict::get_solution_references");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    CYG_REPORT_RETURN();

    return solution_references;

}

// ----------------------------------------------------------------------------

// Try to resolve a conflict. If the conflict was created in a transaction,

// use that transaction. More commonly the conflict will be global and

// a new transaction will have to be created specially for it. Either

// way the conflict may cease to exist.

void

CdlConflictBody::resolve()

{

    CYG_REPORT_FUNCNAME("CdlConflict::resolve");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    CYG_PRECONDITIONC(0 == transaction);

    if (this->resolution_implemented()) {

        CdlTransaction transact = CdlTransactionBody::make(this->get_node()->get_toplevel());

        transact->resolve(this);

        transact->body();

        delete transact;

    }

    CYG_REPORT_RETURN();

}

// ----------------------------------------------------------------------------

// A valuable has just been changed. If this value was relevant to the

// current solution (or lack thereof) then an update is necessary.

void

CdlConflictBody::update_solution_validity(CdlValuable valuable)

{

    CYG_REPORT_FUNCNAME("CdlConflict::update_solution_validity");

    CYG_REPORT_FUNCARG2XV(this, valuable);

    CYG_PRECONDITION_THISC();

    if (solution_references.find(valuable) != solution_references.end()) {

        no_solution = false;

        solution.clear();

        solution_references.clear();

    }

    CYG_REPORT_RETURN();

}

// ----------------------------------------------------------------------------

// Default implementations of the inference engine do not do a lot...

bool

CdlConflictBody::inner_resolve(CdlTransaction trans_arg, int level)

{

    CYG_REPORT_FUNCNAMETYPE("CdlConflict::inner_resolve", "result false");

    CYG_REPORT_FUNCARG3XV(this, trans_arg, level);

    CYG_PRECONDITION_THISC();

    CYG_PRECONDITION_CLASSC(trans_arg);

    // Setting the no_solution flag while keeping a clear

    // solution_accessed vector means that the no_solution flag should

    // always remain set, and hence no further inference attempts will be made.

    no_solution = true;

    CYG_REPORT_RETURN();

    return false;

}

bool

CdlConflictBody::resolution_implemented() const

{

    CYG_REPORT_FUNCNAMETYPE("CdlConflict::resolution_implemented", "result %d");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    CYG_REPORT_RETVAL(false);

    return false;

}

// ----------------------------------------------------------------------------

// Clearing a solution. This is needed if the inference engine has

// failed to find a complete solution, because in attempting this the

// solution_references vector will have been filled in anyway. It may

// have some other uses as well.

void

CdlConflictBody::clear_solution()

{

    CYG_REPORT_FUNCNAME("CdlConflict::clear_solution");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    no_solution = false;

    solution.clear();

    solution_references.clear();

    CYG_REPORT_RETURN();

}

//}}}

//{{{  Basics                                   

// ----------------------------------------------------------------------------

CdlNode

CdlConflictBody::get_node() const

{

    CYG_REPORT_FUNCNAMETYPE("CdlConflict::get_node", "result %p");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    CdlNode result = node;

    CYG_REPORT_RETVAL(result);

    return result;

}

CdlProperty

CdlConflictBody::get_property() const

{

    CYG_REPORT_FUNCNAMETYPE("CdlConflict::get_property", "result %p");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    CdlProperty result  = property;

    CYG_REPORT_RETVAL(result);

    return result;

}

bool

CdlConflictBody::is_structural() const

{

    CYG_REPORT_FUNCNAMETYPE("CdlConflict::is_structural", "result %d");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    bool result = structural;

    CYG_REPORT_RETVAL(result);

    return result;

}

CdlTransaction

CdlConflictBody::get_transaction() const

{

    CYG_REPORT_FUNCNAMETYPE("CdlConflict::get_transaction", "result %p");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    CdlTransaction result = transaction;

    CYG_REPORT_RETVAL(result);

    return result;

}

// FIXME: these are not currently implemented. It would be necessary

// to store the information in the savefile, which requires an

// unambiguous way of identifying a conflict that is likely to

// survice package version changes.

bool

CdlConflictBody::is_enabled() const

{

    CYG_REPORT_FUNCNAMETYPE("CdlConflict::is_enabled", "result %d");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    bool result = enabled;

    CYG_REPORT_RETVAL(result);

    return result;

}

std::string

CdlConflictBody::get_disabled_reason() const

{

    CYG_REPORT_FUNCNAME("CdlConflict::get_disabled_reason");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    // Possibly there should be a check that the conflict is currently

    // disabled, but it might be useful. 

    CYG_REPORT_RETURN();

    return reason;

}

void

CdlConflictBody::disable(std::string reason_arg)

{

    CYG_REPORT_FUNCNAME("CdlConflict::disable");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    reason      = reason_arg;

    enabled     = false;

    CYG_REPORT_RETURN();

}

void

CdlConflictBody::enable()

{

    CYG_REPORT_FUNCNAME("CdlConflict::enable");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    enabled     = true;

    // Leave "reason" alone, it may still be useful

    CYG_REPORT_RETURN();

}

//}}}

//{{{  check_this()                             

// ----------------------------------------------------------------------------

bool

CdlConflictBody::check_this(cyg_assert_class_zeal zeal) const

{

    if (CdlConflictBody_Magic != cdlconflictbody_cookie) {

        return false;

    }

    CYGDBG_MEMLEAK_CHECKTHIS();

    if ((0 == node) || (0 == property)) {

        return false;

    }

    switch(zeal) {

      case cyg_system_test :

      case cyg_extreme :

      {

          if (!node->check_this(cyg_quick)) {

              return false;

          }

          // Accessing the properties would involve a function call.

          if (0 != transaction) {

              if (!transaction->check_this(cyg_quick)) {

                  return false;

              }

              if (structural) {

                  // The conflict should exist in the new_structural_conflicts vector

                  // deleted_structural_conflicts is for toplevel ones.

                  if (std::find(transaction->new_structural_conflicts.begin(),

                                transaction->new_structural_conflicts.end(), this) ==

                      transaction->new_structural_conflicts.end()) {

                      return false;

                  }

              } else {

                  // The conflict may appear on the new_conflicts list

                  // or in the resolved_conflicts vector.

                  if (std::find(transaction->new_conflicts.begin(), transaction->new_conflicts.end(), this) ==

                      transaction->new_conflicts.end()) {

                      if (std::find(transaction->resolved_conflicts.begin(), transaction->resolved_conflicts.end(), this) ==

                          transaction->resolved_conflicts.end()) {

                          return false;

                      }

                  }

              }

          }

          // Checking the toplevel lists would be good, but involves a

          // further function call and hence nested assertions.

      }

      case cyg_thorough :

      {

          if (!node->check_this(cyg_quick)) {

              return false;

          }

          if (!property->check_this(cyg_quick)) {

              return false;

          }

      }

      case cyg_quick :

      {

          if (no_solution && (0 != solution.size())) {

              return false;

          }

      }

      case cyg_trivial :

      case cyg_none :

      default:

          break;

    }

    return true;

}

//}}}

//}}}

//{{{  CdlConflict_Unresolved           

// ----------------------------------------------------------------------------

// Unresolved references. Usually unresolved references occur inside

// expressions, but other properties that may be affected are parent,

// dialog and wizard.

//

// It is possible for a single expression to have multiple unresolved

// references, each of which will result in a separate conflict

// object. It is also possible for an expression to refer to the same

// unknown entity twice or more, in which case there would also be

// separate conflict objects. Unresolved references may also result in

// eval exceptions and in failed requires statements. Trying to cope

// with the various combinations as a single conflict seems too

// error-prone.

void

CdlConflict_UnresolvedBody::make(CdlTransaction trans, CdlNode node_arg, CdlProperty prop_arg, std::string name_arg)

{

    CdlConflict_Unresolved tmp = new CdlConflict_UnresolvedBody(trans, node_arg, prop_arg, name_arg);

    CYG_UNUSED_PARAM(CdlConflict_Unresolved, tmp);

}

CdlConflict_UnresolvedBody::CdlConflict_UnresolvedBody(CdlTransaction trans_arg, CdlNode node_arg, CdlProperty prop_arg,

                                                       std::string target_name_arg)

    : CdlConflictBody(trans_arg, node_arg, prop_arg, true)

{

    CYG_REPORT_FUNCNAME("CdlConflict_Unresolved:: constructor");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITIONC("" != target_name_arg);

    target_name = target_name_arg;

    cdlconflict_unresolvedbody_cookie = CdlConflict_UnresolvedBody_Magic;

    CYGDBG_MEMLEAK_CONSTRUCTOR();

    CYG_POSTCONDITION_THISC();

    CYG_REPORT_RETURN();

}

CdlConflict_UnresolvedBody::~CdlConflict_UnresolvedBody()

{

    CYG_REPORT_FUNCNAME("CdlConflict_Unresolved:: destructor");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    cdlconflict_unresolvedbody_cookie = CdlConflict_UnresolvedBody_Invalid;

    target_name = "";

    CYGDBG_MEMLEAK_DESTRUCTOR();

    CYG_REPORT_RETURN();

}

std::string

CdlConflict_UnresolvedBody::get_target_name() const

{

    CYG_REPORT_FUNCNAME("CdlConflict_Unresolved::get_target_name");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    CYG_REPORT_RETURN();

    return target_name;

}

// For now, just report the node and property name, a brief text, and the

// entity being referenced. 

//

// Eventually we can do clever things like looking up the name in a

// database.

std::string

CdlConflict_UnresolvedBody::get_explanation() const

{

    CYG_REPORT_FUNCNAME("CdlConflict_Unresolved::get_explanation");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    std::string result;

    result = node->get_name() + ", property " + property->get_property_name() +

        ":\nReference to unknown object " + target_name;

    CYG_REPORT_RETURN();

    return result;

}

bool

CdlConflict_UnresolvedBody::check_this(cyg_assert_class_zeal zeal) const

{

    if (CdlConflict_UnresolvedBody_Magic != cdlconflict_unresolvedbody_cookie) {

        return false;

    }

    CYGDBG_MEMLEAK_CHECKTHIS();

    // There is not a lot of checking that can be done on the name.

    return CdlConflictBody::check_this(zeal);

}

bool

CdlConflict_UnresolvedBody::test(CdlConflict conf)

{

    CYG_REPORT_FUNCNAMETYPE("CdlConflict_Unresolved::test", "result %d");

    CYG_REPORT_FUNCARG1XV(conf);

    CYG_PRECONDITION_CLASSC(conf);

    bool result = false;

    CdlConflict_Unresolved tmp = dynamic_cast<CdlConflict_Unresolved>(conf);

    if (0 != tmp) {

        result = true;

    }

    CYG_REPORT_RETVAL(result);

    return result;

}

//}}}

//{{{  CdlConflict_IllegalValue         

// ----------------------------------------------------------------------------

// A valuable object has an illegal value. This can happen because the

// current value is not within the legal_values list, or because of a

// failure of check_proc or entry_proc. In the latter two cases the

// Tcl code should supply an explanation as to why the value is illegal.

//

// Note: if future variants of CDL implement some concept of a value

// that does not match the CdlValuable class then that will need a

// separate CdlConflict derived class.

void

CdlConflict_IllegalValueBody::make(CdlTransaction trans, CdlNode node_arg, CdlProperty prop_arg)

{

    CdlConflict_IllegalValue tmp = new CdlConflict_IllegalValueBody(trans, node_arg, prop_arg);

    CYG_UNUSED_PARAM(CdlConflict_IllegalValue, tmp);

}

CdlConflict_IllegalValueBody::CdlConflict_IllegalValueBody(CdlTransaction trans, CdlNode node_arg, CdlProperty prop_arg)

    : CdlConflictBody(trans, node_arg, prop_arg, false)

{

    CYG_REPORT_FUNCNAME("CdlConflict_IllegalValue:: constructor");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITIONC(0 != dynamic_cast<CdlValuable>(node_arg));

    explanation = "";

    cdlconflict_illegalvaluebody_cookie = CdlConflict_IllegalValueBody_Magic;

    CYGDBG_MEMLEAK_CONSTRUCTOR();

    CYG_POSTCONDITION_THISC();

    CYG_REPORT_RETURN();

}

CdlConflict_IllegalValueBody::~CdlConflict_IllegalValueBody()

{

    CYG_REPORT_FUNCNAME("CdlConflict_IllegalValue:: destructor");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    cdlconflict_illegalvaluebody_cookie = CdlConflict_IllegalValueBody_Invalid;

    explanation = "";

    CYGDBG_MEMLEAK_DESTRUCTOR();

    CYG_REPORT_RETURN();

}

// ----------------------------------------------------------------------------

// If the property is legal_values then it should be a list expression

// property. Display the current value and the original expression.

//

// If the property is check_proc or entry_proc, the Tcl code should

// have produced an explanation string and stored it in the conflict

// object.

std::string

CdlConflict_IllegalValueBody::get_explanation() const

{

    CYG_REPORT_FUNCNAME("CdlConflict_IllegalValue::get_explanation()");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    CdlConstValuable valuable = dynamic_cast<CdlConstValuable>(node);

    CYG_ASSERTC(0 != valuable);

    std::string result = "";

    // FIXME: analyse the current value and flavor a bit more

    result += "Illegal current value " + valuable->get_value() + "\n";

    if (CdlPropertyId_LegalValues == property->get_property_name()) {

        CdlConstProperty_ListExpression expr = dynamic_cast<CdlConstProperty_ListExpression>(property);

        CYG_ASSERTC(0 != expr);

        result += "Legal values are: " + expr->get_original_string();

    } else if (explanation != "") {

        result += explanation;

    } else {

        CYG_FAIL("Inexplicable illegal value");

    }

    CYG_REPORT_RETURN();

    return result;

}

void

CdlConflict_IllegalValueBody::set_explanation(std::string explanation_arg)

{

    CYG_REPORT_FUNCNAME("CdlConflict_IllegalValue::set_explanation");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    explanation = explanation_arg;

    CYG_REPORT_RETURN();

}

// ----------------------------------------------------------------------------

// Inference is implemented. The actual inference code is in infer.cxx

bool

CdlConflict_IllegalValueBody::resolution_implemented() const

{

    CYG_REPORT_FUNCNAME("CdlConflict_IllegalValue::resolution_implemented");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    CYG_REPORT_RETURN();

    return true;

}

// ----------------------------------------------------------------------------

bool

CdlConflict_IllegalValueBody::check_this(cyg_assert_class_zeal zeal) const

{

    if (CdlConflict_IllegalValueBody_Magic != cdlconflict_illegalvaluebody_cookie) {

        return false;