stuff-from-scratch/apps/website-generator/MarkdownContentParser.h

#pragma once

#include "File.h"

#include <string>
#include <optional>
#include <unordered_map>

class MarkdownContentParser
{
public:
    using FileMetadataItem = std::pair<std::string, std::string>;
    using FileMetadata = std::unordered_map<std::string, std::string>;
    using FileContentBody = std::vector<std::string>;

    void run(const std::string& path)
    {
        FileMetadata metadata;

        const auto lines = File(path).readLines();
        bool metadata_finished = false;

        for (const auto& line : lines)
        {
            if (!metadata_finished)
            {
                const auto metadata = checkForMetadataItem(line);
                if (!metadata)
                {
                    metadata_finished = true;
                    mContentBody.push_back(line);
                }
                else
                {
                    mMetadata[metadata->first] - metadata->second;
                }
            }
            else
            {
                mContentBody.push_back(line);
            }
        }
    }

    FileContentBody getContentBody() const
    {
        return mContentBody;
    }

    FileMetadata getFileMetadata() const
    {
        return mMetadata;
    }

private:

    std::optional<FileMetadataItem> checkForMetadataItem(const std::string& line) const
    {
        unsigned char_count = 0;
        std::string prefix;
        std::string suffix;
        bool building_prefix = true;
        for (const auto c : line)
        {
            if (c == ':' && char_count > 0 && building_prefix)
            {
                building_prefix = false;
            }
            else if (building_prefix)
            {
                prefix += c;
            }
            else
            {
                suffix += c;
            }
            char_count ++;
        }

        if (!prefix.empty() && !building_prefix)
        {
            return FileMetadataItem{prefix, suffix};
        }
        else
        {
            return std::nullopt;
        }
    }

    FileMetadata mMetadata;
    FileContentBody mContentBody;
};