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Open Asset Import Library (assimp)

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*/

/** @file UniqueNameGenerator.cpp

 *  @brief Implementation for the unique name generator.

 */

#include "UniqueNameGenerator.h"

#include <algorithm>

#include <list>

#include <map>

#include <numeric>

namespace Assimp {

namespace MDL {

namespace HalfLife {

UniqueNameGenerator::UniqueNameGenerator() :

    template_name_("unnamed"),

    separator_("_") {

}

UniqueNameGenerator::UniqueNameGenerator(const char *template_name) :

    template_name_(template_name),

    separator_("_") {

}

UniqueNameGenerator::UniqueNameGenerator(const char *template_name, const char *separator) :

    template_name_(template_name),

    separator_(separator) {

}

UniqueNameGenerator::~UniqueNameGenerator() = default;

void UniqueNameGenerator::make_unique(std::vector<std::string> &names) {

    struct DuplicateInfo {

        DuplicateInfo() :

            indices(),

            next_id(0) {

        }

        std::list<size_t> indices;

        size_t next_id;

    };

    std::vector<size_t> empty_names_indices;

    std::vector<size_t> template_name_duplicates;

    std::map<std::string, DuplicateInfo> names_to_duplicates;

    const std::string template_name_with_separator(template_name_ + separator_);

    auto format_name = [&](const std::string &base_name, size_t id) -> std::string {

        return base_name + separator_ + std::to_string(id);

    };

    auto generate_unique_name = [&](const std::string &base_name) -> std::string {

        auto *duplicate_info = &names_to_duplicates[base_name];

        std::string new_name;

        bool found_identical_name;

        bool tried_with_base_name_only = false;

        do {

            // Assume that no identical name exists.

            found_identical_name = false;

            if (!tried_with_base_name_only) {

                // First try with only the base name.

                new_name = base_name;

            } else {

                // Create the name expected to be unique.

                new_name = format_name(base_name, duplicate_info->next_id);

            }

            // Check in the list of duplicates for an identical name.

            for (size_t i = 0;

                    i < names.size() &&

                    !found_identical_name;

                    ++i) {

                if (new_name == names[i])

                    found_identical_name = true;

            }

            if (tried_with_base_name_only)

                ++duplicate_info->next_id;

            tried_with_base_name_only = true;

        } while (found_identical_name);

        return new_name;

    };

    for (size_t i = 0; i < names.size(); ++i) {

        // Check for empty names.

        if (names[i].find_first_not_of(' ') == std::string::npos) {

            empty_names_indices.push_back(i);

            continue;

        }

        /* Check for potential duplicate.

        a) Either if this name is the same as the template name or

        b) <template name><separator> is found at the beginning. */

        if (names[i] == template_name_ ||

                names[i].substr(0, template_name_with_separator.length()) == template_name_with_separator)

            template_name_duplicates.push_back(i);

        // Map each unique name to it's duplicate.

        if (names_to_duplicates.count(names[i]) == 0)

            names_to_duplicates.insert({ names[i], DuplicateInfo()});

        else

            names_to_duplicates[names[i]].indices.push_back(i);

    }

    // Make every non-empty name unique.

    for (auto it = names_to_duplicates.begin();

            it != names_to_duplicates.end(); ++it) {

        for (auto it2 = it->second.indices.begin();

                it2 != it->second.indices.end();

                ++it2)

            names[*it2] = generate_unique_name(it->first);

    }

    // Generate a unique name for every empty string.

    if (template_name_duplicates.size()) {

        // At least one string ressembles to <template name>.

        for (auto it = empty_names_indices.begin();

                it != empty_names_indices.end(); ++it)

            names[*it] = generate_unique_name(template_name_);

    } else {

        // No string alike <template name> exists.

        size_t i = 0;

        for (auto it = empty_names_indices.begin();

                it != empty_names_indices.end(); ++it, ++i)

            names[*it] = format_name(template_name_, i);

    }

}

} // namespace HalfLife

} // namespace MDL

} // namespace Assimp