/* Copyright (c) 2013 Microsoft Corporation. All rights reserved. Released under Apache 2.0 license as described in the file LICENSE. Author: Leonardo de Moura */ #pragma once #include #include "util/sexpr/options.h" #include "kernel/expr.h" namespace lean { /** \brief API for formatting expressions */ class formatter_cell { public: virtual ~formatter_cell() {} /** \brief Format the given expression. */ virtual format operator()(expr const & e, options const & opts) = 0; }; /** \brief Smart-pointer for the actual formatter object (aka \c formatter_cell). */ class formatter { std::shared_ptr m_cell; formatter(formatter_cell * c):m_cell(c) {} public: format operator()(expr const & e, options const & opts = options()) const { return (*m_cell)(e, opts); } template friend formatter mk_formatter(FCell && fcell); }; template formatter mk_formatter(FCell && fcell) { return formatter(new FCell(std::forward(fcell))); } std::ostream & operator<<(std::ostream & out, expr const & e); /** \brief Create a simple formatter object based on operator<< */ formatter mk_simple_formatter(); typedef std::function pp_fn; }