Function process_includes_recursive

libraries/lib-engine/src/shader.cpp:9–44

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std::string process_includes_recursive(const std::string & source, const std::string & includeSearchPath, std::vector<std::string> & includes, int depth)
{
    if (depth > 2) throw std::runtime_error("exceeded max include recursion depth");

    static const std::regex re("^[ ]*#[ ]*include[ ]+[\"<](.*)[\">].*");
    std::stringstream input;
    std::stringstream output;

    input << source;

    size_t lineNumber = 1;
    std::smatch matches;
    std::string line;

    while (std::getline(input, line))
    {
        if (std::regex_search(line, matches, re))
        {
            std::string includeFile = matches[1];
            std::string includeString = read_file_text(includeSearchPath + "/" + includeFile);

            if (!includeFile.empty())
            {
                includes.push_back(includeSearchPath + "/" + includeFile);
                output << process_includes_recursive(includeString, includeSearchPath, includes, depth++) << std::endl;
            }
        }
        else
        {
            output << "#line " << lineNumber << std::endl;
            output << line << std::endl;
        }
        ++lineNumber;
    }
    return output.str();
}

std::string preprocess_version(const std::string & source)
{