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/**
** \file parse/tweast.hh
** \brief Declaration of parse::Tweast.
*/
#pragma once
#include <iostream>
#include <map>
#include <sstream>
#include <ast/fwd.hh>
#include <misc/map.hh>
#include <misc/symbol.hh>
#include <parse/metavar-map.hh>
namespace parse
{
/// \brief TWEAST stands for ``Text With Embedded Abstract Syntax Trees''.
///
/// Aggregate string to parse and tables of metavariables.
class Tweast
: public MetavarMap<ast::Exp>
, public MetavarMap<ast::Var>
, public MetavarMap<ast::NameTy>
, public MetavarMap<ast::ChunkList>
, public MetavarMap<parse::Tweast>
{
public:
Tweast();
Tweast(const std::string& str);
/// \brief Stream manipulator.
///
/// Append Tiger expressions to the string to parse.
template <typename T> Tweast& operator<<(const T& t);
/// Metavariables manipulator.
template <typename T> T* take(unsigned s);
/// Move the contents of all aggregated Tweast metavariables into
/// the current Tweast.
void flatten();
/// Get the current input string.
std::string input_get() const;
/// Print the table
std::ostream& dump(std::ostream& ostr) const;
protected:
// Insert base class members in the current scope.
using MetavarMap<ast::Exp>::append_;
using MetavarMap<ast::Var>::append_;
using MetavarMap<ast::NameTy>::append_;
using MetavarMap<ast::ChunkList>::append_;
using MetavarMap<Tweast>::append_;
/// Fake append (default case, i.e. when \a data is not a metavariable).
template <typename T> T& append_(unsigned&, T& data) const;
template <typename T>
void move_metavars_(Tweast& tweast, std::string& input);
protected:
/// The next identifier suffix to create.
static unsigned count_;
/// The string to parse.
std::stringstream input_;
};
/// Display the content of the tweast.
std::ostream& operator<<(std::ostream& ostr, const Tweast& in);
} // namespace parse
#include <parse/tweast.hxx>
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