Indentation.h

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#ifndef fhiclcpp_detail_Indentation_h
#define fhiclcpp_detail_Indentation_h

// =========================================================
//
// Indentation
//
// Used for providing appropriate indentation for
// ParameterSet::to_indented_string.
//
// The 'pop' and 'push' commands must be used symmetrically.
//
// =========================================================

#include <cassert>
#include <stack>
#include <string>

namespace fhicl {
  namespace detail {

    class Indentation {
    public:
      Indentation(unsigned const iil = 0u)
        : indents_{{std::string(iil * indent_increment, ' ')}}
      {}

      Indentation(std::string const& prefix) : indents_{{prefix}} {}

      std::string const&
      operator()() const
      {
        return indents_.top();
      }

      void
      modify_top(std::string const& s)
      {
        assert(!indents_.empty());
        if (indents_.size() == 1ul) {
          indents_.top() = s;
        } else {
          indents_.pop();
          indents_.emplace(indents_.top() + s);
        }
      }

      auto
      size()
      {
        return indents_.size();
      }

      void
      pop()
      {
        indents_.pop();
      }
      void
      push()
      {
        indents_.emplace(indents_.top() + std::string(indent_increment, ' '));
      }

    private:
      static constexpr std::size_t indent_increment = 3u;
      std::stack<std::string> indents_;
    };
  }
}

#endif /* fhiclcpp_detail_Indentation_h */

// Local variables:
// mode: c++
// End: