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