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//{{{  Banner                           

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

//

//     interface.cxx

//

//     Implementation of the CdlInterface class

//

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

//####COPYRIGHTBEGIN####

//                                                                          

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

// Copyright (C) 2002 Bart Veer

// 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:        1999/03/01

// 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.

#include <cdlcore.hxx>

//}}}

//{{{  Statics                          

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

CYGDBG_DEFINE_MEMLEAK_COUNTER(CdlInterfaceBody);

//}}}

//{{{  Constructor                      

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

CdlInterfaceBody::CdlInterfaceBody(std::string name_arg, bool generated_arg)

    : CdlNodeBody(name_arg),

      CdlUserVisibleBody(),

      CdlValuableBody(CdlValueFlavor_Data),

      CdlParentableBody(),

      CdlBuildableBody(),

      CdlDefinableBody()

{

    CYG_REPORT_FUNCNAME("CdlInterfaceBody:: constructor");

    CYG_REPORT_FUNCARG1XV(this);

    generated = generated_arg;

    cdlinterfacebody_cookie = CdlInterfaceBody_Magic;

    CYGDBG_MEMLEAK_CONSTRUCTOR();

    CYG_POSTCONDITION_THISC();

    CYG_REPORT_RETURN();

}

//}}}

//{{{  Destructor                       

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

CdlInterfaceBody::~CdlInterfaceBody()

{

    CYG_REPORT_FUNCNAME("CdlInterfaceBody:: destructor");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    cdlinterfacebody_cookie = CdlInterfaceBody_Invalid;

    CYGDBG_MEMLEAK_DESTRUCTOR();

    CYG_REPORT_RETURN();

}

//}}}

//{{{  parse_interface()                

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

// Parsing an interface definition. This is basically the same as parsing

// an option, component, or package.

int

CdlInterfaceBody::parse_interface(CdlInterpreter interp, int argc, const char* argv[])

{

    CYG_REPORT_FUNCNAMETYPE("CdlInterface::parse_interface", "result %d");

    CYG_REPORT_FUNCARG1("argc %d", argc);

    CYG_PRECONDITION_CLASSC(interp);

    std::string  diag_argv0      = CdlParse::get_tcl_cmd_name(argv[0]);

    CdlLoadable  loadable       = interp->get_loadable();

    CdlContainer parent         = interp->get_container();

    CdlToplevel  toplevel       = interp->get_toplevel();

    CYG_ASSERT_CLASSC(loadable);        // There should always be a loadable during parsing

    CYG_ASSERT_CLASSC(parent);

    CYG_ASSERT_CLASSC(toplevel);

    // The new interface should be created and added to the loadable.

    // early on. If there is a parsing error it will get cleaned up

    // automatically as a consequence of the loadable destructor.

    // However it is necessary to validate the name first. Errors

    // should be reported via CdlParse::report_error(), which

    // may result in an exception.

    CdlInterface new_interface  = 0;

    bool         ok             = true;

    int          result         = TCL_OK;

    try {

        // Currently there are no command-line options. This may change in future.

        if (3 != argc) {

            CdlParse::report_error(interp, "", std::string("Incorrect number of arguments to `") + diag_argv0 +

                                   "'\nExpecting name and properties list.");

            ok = false;

        } else if (!Tcl_CommandComplete(CDL_TCL_CONST_CAST(char*, argv[2]))) {

            CdlParse::report_error(interp, "", std::string("Invalid property list for cdl_interface `") + argv[1] + "'.");

            ok = false;

        } else if (0 != toplevel->lookup(argv[1])) {

            // FIXME: interfaces can be generated implicitly because of an

            // unresolved implements property. This code should look for

            // an existing auto-generated interface object and replace it

            // if necessary.

            CdlParse::report_error(interp, "", std::string("Interface `") + argv[1] +

                                   "' cannot be loaded.\nThe name is already in use.");

            ok = false;

        } else {

            new_interface = new CdlInterfaceBody(argv[1], false);

            toplevel->add_node(loadable, parent, new_interface);

        }

        if (!ok) {

            // Just because this component cannot be created, that is no

            // reason to abort the whole parsing process.

            CYG_REPORT_RETVAL(TCL_OK);

            return TCL_OK;

        }

    } catch(std::bad_alloc e) {

        interp->set_result(CdlParse::construct_diagnostic(interp, "internal error", "", "Out of memory"));

        result = TCL_ERROR;

    } catch(CdlParseException e) {

        interp->set_result(e.get_message());

        result = TCL_ERROR;

    } catch(...) {

        interp->set_result(CdlParse::construct_diagnostic(interp, "internal error", "", "Unexpected C++ exception"));

        result = TCL_ERROR;

    }

    if (TCL_OK != result) {

        CYG_REPORT_RETVAL(result);

        return result;

    }

    // At this stage new_interface has been created and added to the

    // hierarchy. The main work now is to add the properties.

    // Push the option as the current node early on. This aids

    // diagnostics.

    CdlNode old_node = interp->push_node(new_interface);

    // Declare these outside the scope of the try statement, to allow

    // goto calls for the error handling.

    std::string tcl_result;

    std::vector<CdlInterpreterCommandEntry>  new_commands;

    std::vector<CdlInterpreterCommandEntry>* old_commands = 0;

    static CdlInterpreterCommandEntry   commands[] =

    {

        CdlInterpreterCommandEntry("", 0)

    };

    int i;

    // All parsing errors may result in an exception, under the control of

    // application code. This exception must not pass through the Tcl interpreter.

    try {

        for (i = 0; 0 != commands[i].command; i++) {

            new_commands.push_back(commands[i]);

        }

        CdlDefinableBody::add_property_parsers(new_commands);

        CdlBuildableBody::add_property_parsers(new_commands);

        CdlParentableBody::add_property_parsers(new_commands);

        CdlValuableBody::add_property_parsers(new_commands);

        CdlUserVisibleBody::add_property_parsers(new_commands);

        CdlNodeBody::add_property_parsers(new_commands);

        // Now evaluate the body. If an error occurs then typically

        // this will be reported via CdlParse::report_error(),

        // but any exceptions will have been intercepted and

        // turned into a Tcl error.

        old_commands = interp->push_commands(new_commands);

        result = interp->eval(argv[2], tcl_result);

        interp->pop_commands(old_commands);

        if (TCL_OK == result) {

            // Even if there were errors, they were not fatal. There may

            // now be a number of properties for this option, and some

            // validation should take place. Start with the base classes.

            new_interface->CdlNodeBody::check_properties(interp);

            new_interface->CdlUserVisibleBody::check_properties(interp);

            new_interface->CdlValuableBody::check_properties(interp);

            new_interface->CdlParentableBody::check_properties(interp);

            new_interface->CdlBuildableBody::check_properties(interp);

            new_interface->CdlDefinableBody::check_properties(interp);

            // The flavor "none" makes no sense for interfaces.

            // The flavor "bool" makes very little sense, but may be useful

            // in weird cases. Both booldata and data make sense.

            // The default flavor is "data", because interfaces are

            // essentially just counters.

            if (new_interface->has_property(CdlPropertyId_Flavor)) {

                if (CdlValueFlavor_None == new_interface->get_flavor()) {

                    CdlParse::report_error(interp, "", "An interface should not have the `none' flavor.");

                }

            }

            // Interfaces cannot be modified directly by the user, so

            // there is no point in entry_proc, check_proc, dialog or

            // wizard

            if (new_interface->has_property(CdlPropertyId_EntryProc)) {

                CdlParse::report_error(interp, "", "An interface should not have an `entry_proc' property.");

            }

            if (new_interface->has_property(CdlPropertyId_CheckProc)) {

                CdlParse::report_error(interp, "", "An interface should not have a `check_proc' property.");

            }

            if (new_interface->has_property(CdlPropertyId_Dialog)) {

                CdlParse::report_error(interp, "", "An interface should not have a `dialog' property.");

            }

            if (new_interface->has_property(CdlPropertyId_Wizard)) {

                CdlParse::report_error(interp, "", "An interface should not have a `wizard' property.");

            }

            // Calculated does not make sense, an interface is implicitly calculated

            // Nor does default_value.

            if (new_interface->has_property(CdlPropertyId_Calculated)) {

                CdlParse::report_error(interp, "", "An interface should not have a `calculated' property.");

            }

            if (new_interface->has_property(CdlPropertyId_DefaultValue)) {

                CdlParse::report_error(interp, "", "An interface should not have a `default_value' property.");

            }

            // active_if might make sense, as a way of controlling

            // whether or not a #define will be generated.

            // legal_values, requires and implements are all sensible

            // properties for an interface.

            // group may or may not make sense, allow it for now.

            // For the uservisible base class, allow all of display,

            // doc and description. At worst these are harmless

            // For the parentable base class, allow parent. Again this

            // is harmless.

            // Also allow all of the definable and buildable

            // properties.

        }

    } catch (std::bad_alloc e) {

        // Errors at this stage should be reported via Tcl, not via C++.

        // However there is no point in continuing with the parsing operation,

        // just give up.

        interp->set_result(CdlParse::construct_diagnostic(interp, "internal error", "", "Out of memory"));

        result = TCL_ERROR;

    } catch (CdlParseException e) {

        interp->set_result(e.get_message());

        result = TCL_ERROR;

    } catch(...) {

        interp->set_result(CdlParse::construct_diagnostic(interp, "internal error", "", "Unexpected C++ exception"));

        result = TCL_ERROR;

    }

    // Restore the interpreter to its prior state.

    interp->pop_node(old_node);

    if (0 != old_commands) {

        interp->pop_commands(old_commands);

    }

    CYG_REPORT_RETVAL(result);

    return result;

}

//}}}

//{{{  Persistence support              

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

void

CdlInterfaceBody::initialize_savefile_support(CdlToplevel toplevel)

{

    CYG_REPORT_FUNCNAME("CdlInterface::initialize_savefile_support");

    toplevel->add_savefile_command("cdl_interface", 0, &savefile_interface_command);

    CdlValuableBody::initialize_savefile_support(toplevel, "cdl_interface");

    CYG_REPORT_RETURN();

}

void

CdlInterfaceBody::save(CdlInterpreter interp, Tcl_Channel chan, int indentation, bool minimal)

{

    CYG_REPORT_FUNCNAME("CdlInterface::save");

    CYG_REPORT_FUNCARG5XV(this, interp, chan, indentation, minimal);

    CYG_PRECONDITION_THISC();

    CYG_PRECONDITION_CLASSC(interp);

    // Interfaces contain only calculated data, so for a minimal save

    // there is no point in storing any of the data.

    if (!minimal || this->has_additional_savefile_information()) {

        // Start with the UserVisible data, which will result in a suitable set

        // of comments before the package definition itself.

        this->CdlUserVisibleBody::save(interp, chan, indentation, minimal);

        // Now output the line "cdl_interface <name> {"

        // The name is guaranteed to be a valid C preprocessor symbol, so it

        // is not going to need any quoting.

        std::string data = std::string(indentation, ' ') + "cdl_interface " + get_name() + " {\n";

        // Start with details of everything that implements this interface.

        if (!minimal) {

            const std::vector<CdlReferrer>& referrers = this->get_referrers();

            std::vector<CdlReferrer>::const_iterator ref_i;

            int real_referrers = 0;

            for (ref_i = referrers.begin(); ref_i != referrers.end(); ref_i++) {

                CdlNode     node = ref_i->get_source();

                CdlProperty prop = ref_i->get_source_property();

                CdlValuable valuable = dynamic_cast<CdlValuable>(node);

                if ((0 != valuable) && (CdlPropertyId_Implements == prop->get_property_name())) {

                    real_referrers++;

                    data += std::string(indentation, ' ') + "    # Implemented by " + valuable->get_name() + ", " +

                        (valuable->is_active()  ? "active"  : "inactive") + ", " +

                        (valuable->is_enabled() ? "enabled" : "disabled") + '\n';

                }

            }

            if (0 == real_referrers) {

                data += std::string(indentation, ' ') + "    # No options implement this inferface\n";

            }

        }

        interp->write_data(chan, data);

        // Deal with the value

        this->CdlValuableBody::save(interp, chan, indentation + 4, false, minimal);

        // Close the cdl_interface body. A blank line is added here.

        data = "};\n\n";

        interp->write_data(chan, data);

    }

    CYG_REPORT_RETURN();

}

int

CdlInterfaceBody::savefile_interface_command(CdlInterpreter interp, int argc, const char* argv[])

{

    CYG_REPORT_FUNCNAMETYPE("CdlInterface::savefile_interface_command", "result %d");

    CYG_PRECONDITION_CLASSC(interp);

    int result = TCL_OK;

    CdlToplevel toplevel = interp->get_toplevel();

    CYG_ASSERT_CLASSC(toplevel);

    std::vector<CdlInterpreterCommandEntry> subcommands;

    std::vector<CdlInterpreterCommandEntry>* toplevel_commands = 0;

    CdlNode old_node = 0;

    try {

        if (3 != argc) {

            CdlParse::report_error(interp, "", "Invalid cdl_interface command in savefile, expecting two arguments.");

        } else {

            CdlNode current_node = toplevel->lookup(argv[1]);

            if (0 == current_node) {

                // FIXME: save value in limbo

                CdlParse::report_error(interp, "",

                                       std::string("The savefile contains a cdl_interface command for an unknown interface `")

                                       + argv[1] + "'.");

            } else {

                toplevel->get_savefile_subcommands("cdl_interface", subcommands);

                toplevel_commands = interp->push_commands(subcommands);

                old_node = interp->push_node(current_node);

                std::string tcl_result;

                result = interp->eval(argv[2], tcl_result);

                interp->pop_commands(toplevel_commands);

                toplevel_commands = 0;

                interp->pop_node(old_node);

                old_node = 0;

            }

        }

    } catch(...) {

        if (0 != old_node) {

            interp->pop_node(old_node);

        }

        if (0 != toplevel_commands) {

            interp->pop_commands(toplevel_commands);

        }

        throw;

    }

    CYG_REPORT_RETVAL(result);

    return result;

}

//}}}

//{{{  check_this()                     

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

bool

CdlInterfaceBody::check_this(cyg_assert_class_zeal zeal) const

{

    if (CdlInterfaceBody_Magic != cdlinterfacebody_cookie) {

        return false;

    }

    CYGDBG_MEMLEAK_CHECKTHIS();

    return CdlNodeBody::check_this(zeal)        &&

           CdlUserVisibleBody::check_this(zeal) &&

           CdlValuableBody::check_this(zeal)    &&

           CdlParentableBody::check_this(zeal)  &&

           CdlBuildableBody::check_this(zeal)   &&

           CdlDefinableBody::check_this(zeal);

}

//}}}

//{{{  recalculate()                    

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

// There has been a change in the configuration which may affect the value

// of an interface. This can happen for a variety of reasons. For simplicity

// the entire value is just recalculated, with no attempt at optimisation.

// This may have to change in future.

void

CdlInterfaceBody::recalculate(CdlTransaction transaction)

{

    CYG_REPORT_FUNCNAME("CdlInterface::recalculate");

    const CdlValue& old_value = transaction->get_whole_value(this);

    cdl_int count = 0;

    std::vector<CdlValuable> implementers;

    std::vector<CdlValuable>::const_iterator valuable_i;

    this->get_implementers(implementers);

    for (valuable_i = implementers.begin(); valuable_i != implementers.end(); valuable_i++) {

        if (transaction->is_active(*valuable_i)) {

            const CdlValue& implementer_value = transaction->get_whole_value(*valuable_i);

            if (implementer_value.is_enabled()) {

                count++;

            }

        }

    }

    // What to do with the count depends on the flavor.

    switch(this->get_flavor()) {

      case CdlValueFlavor_Bool :

        {

            bool new_bool = (count > 0);

            if (new_bool != old_value.is_enabled()) {

                CdlValue new_value = old_value;

                new_value.set_enabled(new_bool, CdlValueSource_Default);

                transaction->set_whole_value(this, old_value, new_value);

            }

            break;

        }

      case CdlValueFlavor_BoolData:

        {

            // The only thing that actually needs checking is the count value.

            // Iff that has changed then the boolean part may need changing as well.

            if (count != old_value.get_integer_value()) {

                CdlValue new_value = old_value;

                new_value.set_enabled_and_value(count > 0, count, CdlValueSource_Default);

                transaction->set_whole_value(this, old_value, new_value);

            }

            break;

        }

      case CdlValueFlavor_Data:

        {

            if (count != old_value.get_integer_value()) {

                CdlValue new_value = old_value;

                new_value.set_integer_value(count, CdlValueSource_Default);

                transaction->set_whole_value(this, old_value, new_value);

            }

            break;

        }

      default:

        break;

    }

    CYG_REPORT_RETURN();

}

//}}}

//{{{  misc                             

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

bool

CdlInterfaceBody::is_modifiable() const

{

    CYG_REPORT_FUNCNAME("CdlInterface::is_modifiable (false)");

    CYG_PRECONDITION_THISC();

    CYG_REPORT_RETURN();

    return false;

}

std::string

CdlInterfaceBody::get_class_name() const

{

    CYG_REPORT_FUNCNAME("CdlInterface::get_class_name");

    CYG_PRECONDITION_THISC();

    CYG_REPORT_RETURN();

    return "interface";

}

void

CdlInterfaceBody::get_implementers(std::vector<CdlValuable>& implementers) const

{

    CYG_REPORT_FUNCNAME("CdlInterface::get_implementers");

    CYG_PRECONDITION_THISC();

    const std::vector<CdlReferrer>& referrers = this->get_referrers();

    std::vector<CdlReferrer>::const_iterator ref_i;

    for (ref_i = referrers.begin(); ref_i != referrers.end(); ref_i++) {

        CdlNode     node = ref_i->get_source();

        CdlProperty prop = ref_i->get_source_property();

        CdlValuable valuable = dynamic_cast<CdlValuable>(node);

        if ((0 != valuable) && (CdlPropertyId_Implements == prop->get_property_name())) {

            implementers.push_back(valuable);

        }

    }

    CYG_REPORT_RETURN();

}

// Interfaces are somewhat peculiar, in that they can be defined implicitly

// simply by occurring in an "implements" property, or explicitly inside

// a CDL script. Worse, they can switch between these two states when

// loadables are added or removed.

bool

CdlInterfaceBody::was_generated() const

{

    CYG_REPORT_FUNCNAMETYPE("CdlInterface::was_generated", "result %d");

    CYG_REPORT_FUNCARG1XV(this);

    CYG_PRECONDITION_THISC();

    bool result = this->generated;

    CYG_REPORT_RETVAL(result);

    return result;

}

//}}}