regex-combinators.hh

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#pragma once
 
#include "lix/libutil/strings.hh"
 
#include <string_view>
 
namespace nix::regex {
 
// TODO use constexpr string building like
// https://github.com/akrzemi1/static_string/blob/master/include/ak_toolkit/static_string.hpp
 
static inline std::string either(std::string_view a, std::string_view b)
{
    return std::string { a } + "|" + b;
}
 
static inline std::string group(std::string_view a)
{
    return std::string { "(" } + a + ")";
}
 
static inline std::string many(std::string_view a)
{
    return std::string { "(?:" } + a + ")*";
}
 
static inline std::string list(std::string_view a)
{
    return std::string { a } + many(group("," + a));
}
 
}