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option.cxx

//{{{  Banner                           

//============================================================================
//
//     option.cxx
//
//     Implementation of the CdlOption 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>

// <cdl.hxx> defines everything implemented in this module.
// It implicitly supplies <string>, <vector> and <map> because
// the class definitions rely on these headers.
#include <cdl.hxx>

//}}}

//{{{  Statics                          

// ----------------------------------------------------------------------------
CYGDBG_DEFINE_MEMLEAK_COUNTER(CdlOptionBody);

//}}}
//{{{  Constructor                      

// ----------------------------------------------------------------------------
CdlOptionBody::CdlOptionBody(std::string name_arg)
    : CdlNodeBody(name_arg),
      CdlUserVisibleBody(),
      CdlValuableBody(),
      CdlParentableBody(),
      CdlBuildableBody(),
      CdlDefinableBody()
{
    CYG_REPORT_FUNCNAME("CdlOptionBody:: constructor");
    CYG_REPORT_FUNCARG1XV(this);

    cdloptionbody_cookie = CdlOptionBody_Magic;
    CYGDBG_MEMLEAK_CONSTRUCTOR();

    CYG_POSTCONDITION_THISC();
    CYG_REPORT_RETURN();
}

//}}}
//{{{  Destructor                       

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

CdlOptionBody::~CdlOptionBody()
{
    CYG_REPORT_FUNCNAME("CdlOptionBody:: destructor");
    CYG_REPORT_FUNCARG1XV(this);
    CYG_PRECONDITION_THISC();

    cdloptionbody_cookie = CdlOptionBody_Invalid;
    CYGDBG_MEMLEAK_DESTRUCTOR();
    
    CYG_REPORT_RETURN();
}

//}}}
//{{{  parse_option()                   

// ----------------------------------------------------------------------------
// Parsing an option definition. This is basically the same as
// CdlComponent::parse_component(), but simpler: an option is not
// a container, and the only non-standard property is "parent".

int
CdlOptionBody::parse_option(CdlInterpreter interp, int argc, const char* argv[])
{
    CYG_REPORT_FUNCNAMETYPE("CdlOptionBody::parse_option", "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();
    CdlPackage   package        = dynamic_cast<CdlPackage>(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(package);         // And packages are the only loadable for software CDL
    CYG_ASSERT_CLASSC(parent);
    CYG_ASSERT_CLASSC(toplevel);

    // The new option should be created and added to the package
    // early on. If there is a parsing error it will get cleaned up
    // automatically as a consequence of the package destructor.
    // However it is necessary to validate the name first. Errors
    // should be reported via CdlParse::report_error(),
    // which may result in an exception.
    CdlOption    new_option     = 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_option `") + argv[1] + "'.");
            ok = false;
        } else if (0 != toplevel->lookup(argv[1])) {
            CdlParse::report_error(interp, "",
                                   std::string("Option `") + argv[1] + "' cannot be loaded.\nThe name is already in use.");
            ok = false;
        } else {
            new_option = new CdlOptionBody(argv[1]);
            toplevel->add_node(package, parent, new_option);
        }

        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_option 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_option);

    // 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_option->CdlNodeBody::check_properties(interp);
            new_option->CdlUserVisibleBody::check_properties(interp);
            new_option->CdlValuableBody::check_properties(interp);
            new_option->CdlParentableBody::check_properties(interp);
            new_option->CdlBuildableBody::check_properties(interp);
            new_option->CdlDefinableBody::check_properties(interp);
        }
        
    } 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
CdlOptionBody::initialize_savefile_support(CdlToplevel toplevel)
{
    CYG_REPORT_FUNCNAME("CdlOption::initialize_savefile_support");

    toplevel->add_savefile_command("cdl_option", 0, &savefile_option_command);
    CdlValuableBody::initialize_savefile_support(toplevel, "cdl_option");

    CYG_REPORT_RETURN();
}

void
CdlOptionBody::save(CdlInterpreter interp, Tcl_Channel chan, int indentation, bool minimal)
{
    CYG_REPORT_FUNCNAME("CdlOption::save");
    CYG_REPORT_FUNCARG5XV(this, interp, chan, indentation, minimal);
    CYG_PRECONDITION_THISC();
    CYG_PRECONDITION_CLASSC(interp);

    if (!minimal || this->has_additional_savefile_information() || this->value_savefile_entry_needed()) {
        // 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_option <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_option " + get_name() + " {\n";
        interp->write_data(chan, data);

        // Deal with the value
        bool modifiable = !(CdlValueFlavor_None == this->get_flavor()) &&
            !this->has_property(CdlPropertyId_Calculated);
        this->CdlValuableBody::save(interp, chan, indentation + 4, modifiable, minimal);

        // And with any unrecognised data
        this->CdlNodeBody::save(interp, chan, indentation + 4, minimal);
    
        // Close the cdl_option body. A blank line is added here.
        interp->write_data(chan, "};\n\n");
    }
    
    CYG_REPORT_RETURN();
}

int
CdlOptionBody::savefile_option_command(CdlInterpreter interp, int argc, const char* argv[])
{
    CYG_REPORT_FUNCNAMETYPE("CdlOption::savefile_option_command", "result %d");
    CYG_PRECONDITION_CLASSC(interp);

    int result = TCL_OK;
    CdlToplevel toplevel = interp->get_toplevel();
    CYG_ASSERT_CLASSC(toplevel);
    CdlConfiguration config = dynamic_cast<CdlConfiguration>(toplevel);
    CYG_ASSERT_CLASSC(config);

    std::vector<CdlInterpreterCommandEntry> subcommands;
    std::vector<CdlInterpreterCommandEntry>* toplevel_commands = 0;
    CdlNode old_node = 0;
    
    try {
        
        if (3 != argc) {
            CdlParse::report_error(interp, "", "Invalid cdl_option command in savefile, expecting two arguments.");
        } else {

            CdlNode current_node = config->lookup(argv[1]);
            if (0 == current_node) {
                // FIXME: save value in limbo
                CdlParse::report_error(interp, "",
                                       std::string("The savefile contains a cdl_option for an unknown option `")
                                       + argv[1] + "'");
            } else {
                config->get_savefile_subcommands("cdl_option", 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
CdlOptionBody::check_this(cyg_assert_class_zeal zeal) const
{
    if (CdlOptionBody_Magic != cdloptionbody_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);
}

//}}}
//{{{  misc                             

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

std::string
CdlOptionBody::get_class_name() const
{
    CYG_REPORT_FUNCNAME("CdlOption::get_class_name");
    CYG_PRECONDITION_THISC();
    CYG_REPORT_RETURN();
    return "option";
}

//}}}

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