//
// See the file "COPYING" in the main distribution directory for copyright.

#include "module_util.h"

#include <cstring>
#include <string>

using namespace std;

static int streq(const char* s1, const char* s2) { return ! strcmp(s1, s2); }

// Returns it without trailing "::".
string extract_module_name(const char* name) {
    string module_name = name;
    string::size_type pos = module_name.rfind("::");

    if ( pos == string::npos )
        return GLOBAL_MODULE_NAME;

    module_name.erase(pos);

    return module_name;
}

string extract_var_name(const char* name) {
    string var_name = name;
    string::size_type pos = var_name.rfind("::");

    if ( pos == string::npos )
        return var_name;

    if ( pos + 2 > var_name.size() )
        return "";

    return var_name.substr(pos + 2);
}

string normalized_module_name(const char* module_name) {
    size_t mod_len;
    if ( mod_len = strlen(module_name); mod_len >= 2 && streq(module_name + mod_len - 2, "::") )
        mod_len -= 2;

    return {module_name, mod_len};
}

string make_full_var_name(const char* module_name, const char* var_name) {
    if ( ! module_name || streq(module_name, GLOBAL_MODULE_NAME) || strstr(var_name, "::") ) {
        if ( streq(GLOBAL_MODULE_NAME, extract_module_name(var_name).c_str()) )
            return extract_var_name(var_name);

        return var_name;
    }

    string full_name = normalized_module_name(module_name);
    full_name += "::";
    full_name += var_name;

    return full_name;
}