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

// Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.            

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// This program is free software; you can redistribute it and/or modify     

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

//

//      flags.cxx

//

//      The implementation of build flags extraction from CDL data

//

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

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

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

//

// Author(s):           jld

// Date:                1999-11-08

//

//####DESCRIPTIONEND####

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

#include "flags.hxx"

#include <cctype>

static const std::string GLOBAL_FLAGS_PREFIX = "CYGBLD_GLOBAL_";

static const std::string ADD_FLAGS_SUFFIX    = "_ADD";

static const std::string REMOVE_FLAGS_SUFFIX = "_REMOVE";

// convert a string of space-separated values into a list of strings

static void string_to_list (std::string input, std::list <std::string> & output) {

        std::string item;

        bool space = true;

        output.clear ();

        for (unsigned int n = 0; n < input.size (); n++) { // for each char in the string

                if (isspace (input [n])) { // if char is a space

                        if (! space) { // if previous char not a space

                                output.push_back (item); // add item to output list

                                item.erase (); // clear item string

                                space = true;

                        }

                } else { // char is not a space

                        item += input [n]; // add char to item string

                        space = false;

                }

        }

        if (! space) { // if final char not a space

                output.push_back (item); // add final item to output list

        }

}

// convert a list of strings into a string of space-separated values

static std::string list_to_string (std::list <std::string> & input) {

        std::string output;

        for (std::list <std::string>::iterator item = input.begin (); item != input.end (); item++) { // for each item in the list

                output += * item + " "; // add item to output string followed by a space

        }

        if (! output.empty ()) { // if the output string is not empty

                output.resize (output.size () - 1); // remove the trailing space

        }

        return output;

}

// return the build flags of the specified category

std::string get_flags (const CdlConfiguration config, const CdlBuildInfo_Loadable * build_info, const std::string flag_category) {

        std::list <std::string> flags_list;

        CdlValuable global_flags = dynamic_cast <CdlValuable> (config->lookup (GLOBAL_FLAGS_PREFIX + flag_category));

        if (global_flags) { // if there are global flags

                string_to_list (global_flags->get_value (), flags_list);

        }

        if (build_info) { // if the caller requires flags specific to a particular loadable

                // process flags to be removed

                CdlValuable remove_flags = dynamic_cast <CdlValuable> (config->lookup (build_info->name + "_" + flag_category + REMOVE_FLAGS_SUFFIX));

                if (remove_flags) { // if there are flags to be removed

                        std::list <std::string> remove_flags_list;

                        string_to_list (remove_flags->get_value (), remove_flags_list);

                        for (std::list <std::string>::iterator item = remove_flags_list.begin (); item != remove_flags_list.end (); item++) {

                                flags_list.remove (* item); // remove the flag from the list

                        }

                }

                // process flags to be added

                CdlValuable add_flags = dynamic_cast <CdlValuable> (config->lookup (build_info->name + "_" + flag_category + ADD_FLAGS_SUFFIX));

                if (add_flags) { // if there are flags to be added

                        std::list <std::string> add_flags_list;

                        string_to_list (add_flags->get_value (), add_flags_list);

                        flags_list.splice (flags_list.end (), add_flags_list); // splice the additional flags onto the end of the list

                }

        }

        return list_to_string (flags_list);

}