31 lines
1.1 KiB
C++
31 lines
1.1 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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#include <utility>
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#include "util/sexpr/format.h"
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#include "kernel/expr.h"
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namespace lean {
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/**
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\brief Abstract class for providing expression position information (line number and position).
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*/
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class pos_info_provider {
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public:
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virtual ~pos_info_provider() {}
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/**
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\brief Return the line number and position associated with the given expression.
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Throws an exception if the given expression does not have this kind of information associated with it.
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*/
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virtual std::pair<unsigned, unsigned> get_pos_info(expr const & e) const = 0;
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unsigned get_line(expr const & e) const { return get_pos_info(e).first; }
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unsigned get_pos(expr const & e) const { return get_pos_info(e).second; }
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/**
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\brief Pretty print position information for the given expression.
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Return a null format object if expression is not associated with position information.
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*/
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virtual format pp(expr const & e) const;
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};
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}
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