Program Listing for File Slugify.hpp

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#pragma once

#include "util/common/Result.hpp"
#include "util/function/FunctionContext.hpp"

#include <cctype>
#include <string>

namespace PDJE_UTIL::function {

struct SlugifyArgs {
    std::string input;
    bool        lowercase = true;
    char        separator = '-';
};

inline common::Result<std::string>
slugify(const SlugifyArgs &args, EvalOptions options = {})
{
    (void)options;

    if (std::isalnum(static_cast<unsigned char>(args.separator))) {
        return common::Result<std::string>::failure(
            { common::StatusCode::invalid_argument,
              "SlugifyArgs.separator must be a non-alphanumeric delimiter." });
    }

    std::string output;
    output.reserve(args.input.size());

    bool previous_was_separator = true;
    for (unsigned char ch : args.input) {
        if (std::isalnum(ch)) {
            output.push_back(args.lowercase ? static_cast<char>(std::tolower(ch))
                                            : static_cast<char>(ch));
            previous_was_separator = false;
        } else if (!previous_was_separator && !output.empty()) {
            output.push_back(args.separator);
            previous_was_separator = true;
        }
    }

    while (!output.empty() && output.back() == args.separator) {
        output.pop_back();
    }

    return common::Result<std::string>::success(std::move(output));
}

} // namespace PDJE_UTIL::function