mirror of
https://github.com/matrix-construct/construct
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95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_SPIRIT_PARSE_H
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// This file is not part of the IRCd standard include list (stdinc.h) because
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// it involves extremely expensive boost headers for creating formal spirit
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// grammars. This file is automatically included in the spirit.h group.
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namespace ircd::spirit
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{
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template<class rule,
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class... attr>
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bool parse(const char *&start, const char *const &stop, rule&&, attr&&...);
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template<class parent_error,
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size_t error_show_max = 128,
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class rule,
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class... attr>
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bool parse(const char *&start, const char *const &stop, rule&&, attr&&...);
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template<class rule,
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class... attr>
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bool parse(std::nothrow_t, const char *&start, const char *const &stop, rule&&, attr&&...) noexcept;
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}
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/// Execute the parse. The start pointer is advanced upon successful execution.
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/// Failures must not throw: If the grammar contains any epsilon expressions or
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/// callbacks which throw it is UB. This overload exists to force suppression
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/// of EH from the base of a complex/opaque rule tree.
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template<class rule,
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class... attr>
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[[using gnu: always_inline, gnu_inline, artificial]]
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extern inline bool
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ircd::spirit::parse(std::nothrow_t,
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const char *&start,
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const char *const &stop,
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rule&& r,
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attr&&... a)
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noexcept try
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{
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return ircd::spirit::parse(start, stop, std::forward<rule>(r), std::forward<attr>(a)...);
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}
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catch(...)
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{
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assert(false);
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__builtin_unreachable();
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}
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/// Execute the parse. The start pointer is advanced upon successful execution.
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/// Failures may throw depending on the grammar. Boost's expectation_failure is
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/// translated into our expectation_failure describing the failure.
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template<class parent_error,
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size_t error_show_max,
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class rule,
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class... attr>
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[[using gnu: always_inline, gnu_inline, artificial]]
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extern inline bool
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ircd::spirit::parse(const char *&start,
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const char *const &stop,
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rule&& r,
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attr&&... a)
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try
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{
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return ircd::spirit::parse(start, stop, std::forward<rule>(r), std::forward<attr>(a)...);
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}
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catch(const qi::expectation_failure<const char *> &e)
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{
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throw expectation_failure<parent_error>
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{
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e, error_show_max
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};
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}
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/// Low-level qi::parse entry point. Throws boost's qi::expectation_failure;
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/// Try not to allow this exception to escape the calling unit.
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template<class rule,
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class... attr>
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[[using gnu: always_inline, gnu_inline, artificial]]
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extern inline bool
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ircd::spirit::parse(const char *&start,
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const char *const &stop,
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rule&& r,
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attr&&... a)
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{
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return qi::parse(start, stop, std::forward<rule>(r), std::forward<attr>(a)...);
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}
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