mirror of
https://github.com/matrix-construct/construct
synced 2024-11-14 14:01:08 +01:00
1142 lines
25 KiB
C++
1142 lines
25 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 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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namespace ircd { namespace fmt
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__attribute__((visibility("hidden")))
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{
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using namespace ircd::spirit;
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struct spec;
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struct specifier;
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struct parser extern const parser;
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constexpr char SPECIFIER
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{
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'%'
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};
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constexpr char SPECIFIER_TERMINATOR
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{
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'$'
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};
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extern std::map<string_view, specifier *, std::less<>> specifiers;
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struct bool_specifier extern const bool_specifier;
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struct char_specifier extern const char_specifier;
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struct signed_specifier extern const signed_specifier;
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struct unsigned_specifier extern const unsigned_specifier;
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struct float_specifier extern const float_specifier;
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struct hex_uppercase_specifier extern const hex_uppercase_specifier;
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struct hex_lowercase_specifier extern const hex_lowercase_specifier;
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struct pointer_specifier extern const pointer_specifier;
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struct string_specifier extern const string_specifier;
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bool is_specifier(const string_view &name);
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void handle_specifier(mutable_buffer &out, const uint &idx, const spec &, const arg &);
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template<class generator> bool generate_string(char *&out, const generator &gen, const arg &val);
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template<class T, class lambda> bool visit_type(const arg &val, lambda&& closure);
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}}
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/// Structural representation of a format specifier. The parse of each
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/// specifier in the format string creates one of these.
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struct ircd::fmt::spec
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{
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char sign {'+'};
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char pad {' '};
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ushort width {0};
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ushort precision {0};
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string_view name;
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spec() = default;
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};
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/// Reflects the fmt::spec struct to allow the spirit::qi grammar to directly
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/// fill in the spec struct.
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BOOST_FUSION_ADAPT_STRUCT
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(
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ircd::fmt::spec,
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( decltype(ircd::fmt::spec::sign), sign )
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( decltype(ircd::fmt::spec::pad), pad )
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( decltype(ircd::fmt::spec::width), width )
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( decltype(ircd::fmt::spec::precision), precision )
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( decltype(ircd::fmt::spec::name), name )
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)
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/// A format specifier handler module. This allows a new "%foo" to be defined
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/// with custom handling by overriding. This abstraction is inserted into a
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/// mapping key'ed by the supplied names leading to an instance of this.
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///
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class ircd::fmt::specifier
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{
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std::set<std::string> names;
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public:
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virtual bool operator()(char *&out, const size_t &max, const spec &, const arg &) const = 0;
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specifier(const std::initializer_list<std::string> &names);
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specifier(const std::string &name);
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virtual ~specifier() noexcept;
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};
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/// Linkage for the lookup mapping of registered format specifiers.
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decltype(ircd::fmt::specifiers)
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ircd::fmt::specifiers;
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/// The format string parser grammar.
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struct ircd::fmt::parser
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:qi::grammar<const char *, fmt::spec>
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{
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template<class R = unused_type> using rule = qi::rule<const char *, R>;
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const rule<> specsym
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{
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lit(SPECIFIER)
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,"format specifier"
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};
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const rule<> specterm
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{
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lit(SPECIFIER_TERMINATOR)
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,"specifier termination"
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};
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const rule<string_view> name
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{
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raw[repeat(1,14)[char_("A-Za-z")]]
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,"specifier name"
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};
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rule<fmt::spec> spec;
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parser()
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:parser::base_type{spec}
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{
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static const auto is_valid([]
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(const auto &str, auto &, auto &valid)
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{
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valid = is_specifier(str);
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});
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spec %= specsym
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>> !specsym
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>> -(char_('+') | char_('-'))
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>> (-char_('0') | attr(' '))
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>> -ushort_
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>> -(lit('.') >> ushort_)
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>> name[is_valid]
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>> -specterm
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;
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}
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}
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const ircd::fmt::parser;
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struct ircd::fmt::string_specifier
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:specifier
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{
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static const std::tuple
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<
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const char *,
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std::string,
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std::string_view,
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ircd::string_view,
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ircd::json::string,
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ircd::json::object,
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ircd::json::array
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>
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types;
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bool operator()(char *&out, const size_t &max, const spec &, const arg &val) const override;
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using specifier::specifier;
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}
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const ircd::fmt::string_specifier
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{
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"s"s
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};
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decltype(ircd::fmt::string_specifier::types)
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ircd::fmt::string_specifier::types;
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struct ircd::fmt::bool_specifier
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:specifier
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{
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static const std::tuple
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<
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bool,
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char, unsigned char,
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short, unsigned short,
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int, unsigned int,
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long, unsigned long,
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long long, unsigned long long
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>
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types;
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bool operator()(char *&out, const size_t &max, const spec &, const arg &val) const override;
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using specifier::specifier;
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}
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const ircd::fmt::bool_specifier
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{
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{ "b"s }
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};
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decltype(ircd::fmt::bool_specifier::types)
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ircd::fmt::bool_specifier::types;
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struct ircd::fmt::signed_specifier
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:specifier
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{
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static const std::tuple
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<
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bool,
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char, unsigned char,
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short, unsigned short,
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int, unsigned int,
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long, unsigned long,
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long long, unsigned long long
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>
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types;
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bool operator()(char *&out, const size_t &max, const spec &, const arg &val) const override;
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using specifier::specifier;
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}
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const ircd::fmt::signed_specifier
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{
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{ "d"s, "ld"s, "zd"s }
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};
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decltype(ircd::fmt::signed_specifier::types)
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ircd::fmt::signed_specifier::types;
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struct ircd::fmt::unsigned_specifier
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:specifier
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{
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static const std::tuple
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<
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bool,
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char, unsigned char,
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short, unsigned short,
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int, unsigned int,
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long, unsigned long,
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long long, unsigned long long
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>
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types;
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bool operator()(char *&out, const size_t &max, const spec &, const arg &val) const override;
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using specifier::specifier;
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}
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const ircd::fmt::unsigned_specifier
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{
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{ "u"s, "lu"s, "zu"s }
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};
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struct ircd::fmt::hex_lowercase_specifier
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:specifier
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{
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static const std::tuple
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<
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bool,
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char, unsigned char,
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short, unsigned short,
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int, unsigned int,
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long, unsigned long,
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long long, unsigned long long
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>
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types;
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bool operator()(char *&out, const size_t &max, const spec &, const arg &val) const override;
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using specifier::specifier;
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}
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const ircd::fmt::hex_lowercase_specifier
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{
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{ "x"s, "lx"s }
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};
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decltype(ircd::fmt::hex_lowercase_specifier::types)
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ircd::fmt::hex_lowercase_specifier::types;
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struct ircd::fmt::hex_uppercase_specifier
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:specifier
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{
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static const std::tuple
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<
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bool,
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char, unsigned char,
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short, unsigned short,
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int, unsigned int,
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long, unsigned long,
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long long, unsigned long long
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>
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types;
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bool operator()(char *&out, const size_t &max, const spec &, const arg &val) const override;
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using specifier::specifier;
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}
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const ircd::fmt::hex_uppercase_specifier
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{
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{ "X"s, "lX"s }
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};
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decltype(ircd::fmt::hex_uppercase_specifier::types)
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ircd::fmt::hex_uppercase_specifier::types;
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decltype(ircd::fmt::unsigned_specifier::types)
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ircd::fmt::unsigned_specifier::types;
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struct ircd::fmt::float_specifier
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:specifier
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{
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static const std::tuple
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<
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char, unsigned char,
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short, unsigned short,
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int, unsigned int,
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long, unsigned long,
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float, double,
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long double
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>
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types;
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bool operator()(char *&out, const size_t &max, const spec &, const arg &val) const override;
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using specifier::specifier;
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}
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const ircd::fmt::float_specifier
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{
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{ "f"s, "lf"s }
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};
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decltype(ircd::fmt::float_specifier::types)
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ircd::fmt::float_specifier::types;
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struct ircd::fmt::char_specifier
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:specifier
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{
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bool operator()(char *&out, const size_t &max, const spec &, const arg &val) const override;
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using specifier::specifier;
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}
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const ircd::fmt::char_specifier
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{
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"c"s
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};
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struct ircd::fmt::pointer_specifier
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:specifier
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{
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bool operator()(char *&out, const size_t &max, const spec &, const arg &val) const override;
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using specifier::specifier;
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}
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const ircd::fmt::pointer_specifier
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{
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"p"s
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};
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ircd::fmt::snprintf::snprintf(internal_t,
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const mutable_buffer &out,
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const string_view &fmt,
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const va_rtti &v)
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try
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:out{out}
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,fmt{[&fmt]
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{
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// start the member fmt variable at the first specifier (or end)
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const auto pos(fmt.find(SPECIFIER));
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return pos != fmt.npos?
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fmt.substr(pos):
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string_view{};
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}()}
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,idx{0}
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{
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// If out has no size we have nothing to do, not even null terminate it.
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if(unlikely(empty(out)))
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return;
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// If fmt has no specifiers then we can just copy the fmt as best as
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// possible to the out buffer.
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if(empty(this->fmt))
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{
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append(fmt);
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return;
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}
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// Copy everything from fmt up to the first specifier.
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assert(data(this->fmt) >= data(fmt));
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append(string_view(data(fmt), data(this->fmt)));
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// Iterate
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auto it(begin(v));
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for(size_t i(0); i < v.size() && !finished(); ++it, i++)
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{
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const void *const &ptr(get<0>(*it));
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const std::type_index type(*get<1>(*it));
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argument(std::make_tuple(ptr, type));
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}
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// Ensure null termination if out buffer is non-empty.
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assert(size(this->out) > 0);
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assert(this->out.remaining());
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copy(this->out, "\0"_sv);
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}
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catch(const std::out_of_range &e)
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{
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throw invalid_format
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{
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"Format string requires more than %zu arguments.", v.size()
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};
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}
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void
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ircd::fmt::snprintf::argument(const arg &val)
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{
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// The format string's front pointer is sitting on the specifier '%'
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// waiting to be parsed now.
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fmt::spec spec;
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auto &start(std::get<0>(this->fmt));
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const auto &stop(std::get<1>(this->fmt));
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if(qi::parse(start, stop, parser, spec))
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handle_specifier(this->out, idx++, spec, val);
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string_view fmt
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{
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start, stop
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};
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if(size(fmt) >= 2 && fmt[0] == SPECIFIER && fmt[1] == SPECIFIER)
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{
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append({&SPECIFIER, 1});
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fmt = string_view
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{
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start + 2, stop
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};
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}
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auto nextpos(fmt.find(SPECIFIER));
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append(fmt.substr(0, nextpos));
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this->fmt = const_buffer
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{
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nextpos != fmt.npos?
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fmt.substr(nextpos):
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string_view{}
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};
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}
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void
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ircd::fmt::snprintf::append(const string_view &src)
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{
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out([&src](const mutable_buffer &buf)
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{
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return strlcpy(buf, src);
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});
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}
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size_t
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ircd::fmt::snprintf::remaining()
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const
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{
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return out.remaining()?
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out.remaining() - 1:
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0;
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}
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bool
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ircd::fmt::snprintf::finished()
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const
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{
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return empty(fmt) || !remaining();
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}
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ircd::fmt::specifier::specifier(const std::string &name)
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:specifier{{name}}
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{
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}
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ircd::fmt::specifier::specifier(const std::initializer_list<std::string> &names)
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:names{names}
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{
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for(const auto &name : this->names)
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if(is_specifier(name))
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throw error
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{
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"Specifier '%s' already registered\n", name
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};
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for(const auto &name : this->names)
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specifiers.emplace(name, this);
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}
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ircd::fmt::specifier::~specifier()
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noexcept
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{
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for(const auto &name : names)
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specifiers.erase(name);
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}
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bool
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ircd::fmt::is_specifier(const string_view &name)
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{
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return specifiers.count(name);
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}
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void
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ircd::fmt::handle_specifier(mutable_buffer &out,
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const uint &idx,
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const spec &spec,
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const arg &val)
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try
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{
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const auto &type(get<1>(val));
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const auto &handler(*specifiers.at(spec.name));
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auto &outp(std::get<0>(out));
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assert(size(out));
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const size_t max
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{
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size(out) - 1 // Leave room for null byte for later.
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};
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if(unlikely(!handler(outp, max, spec, val)))
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throw invalid_type
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{
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"`%s' (%s) for format specifier '%s' for argument #%u",
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demangle(type.name()),
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type.name(),
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spec.name,
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idx
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};
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}
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catch(const std::out_of_range &e)
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{
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throw invalid_format
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{
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"Unhandled specifier `%s' for argument #%u in format string",
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spec.name,
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idx
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};
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}
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catch(const illegal &e)
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{
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throw illegal
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{
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"Specifier `%s' for argument #%u: %s",
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spec.name,
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idx,
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e.what()
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};
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}
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|
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template<class T,
|
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class lambda>
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bool
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ircd::fmt::visit_type(const arg &val,
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lambda&& closure)
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{
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const auto &ptr(get<0>(val));
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const auto &type(get<1>(val));
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return type == typeid(T)? closure(*static_cast<const T *>(ptr)) : false;
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}
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bool
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ircd::fmt::pointer_specifier::operator()(char *&out,
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const size_t &max,
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const spec &spec,
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const arg &val)
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const
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{
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using karma::eps;
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using karma::maxwidth;
|
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static const auto throw_illegal([]
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{
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throw illegal("Not a pointer");
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});
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|
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struct generator
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:karma::grammar<char *, uintptr_t()>
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{
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karma::rule<char *, uintptr_t()> rule
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{
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lit("0x") << karma::hex
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};
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_r1_type width;
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_r2_type pad;
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karma::rule<char *, uintptr_t(ushort, char)> aligned_left
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{
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karma::left_align(width, pad)[rule]
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,"left aligned"
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};
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karma::rule<char *, uintptr_t(ushort, char)> aligned_right
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{
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karma::right_align(width, pad)[rule]
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,"right aligned"
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};
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karma::rule<char *, uintptr_t(ushort, char)> aligned_center
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{
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karma::center(width, pad)[rule]
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,"center aligned"
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};
|
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generator(): generator::base_type{rule} {}
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}
|
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static const generator;
|
|
|
|
const auto &ptr(get<0>(val));
|
|
const auto &type(get<1>(val));
|
|
const void *const p
|
|
{
|
|
*static_cast<const void *const *>(ptr)
|
|
};
|
|
|
|
const auto &mw(maxwidth(max));
|
|
static const auto &ep(eps[throw_illegal]);
|
|
|
|
if(!spec.width)
|
|
return karma::generate(out, mw[generator] | ep, uintptr_t(p));
|
|
|
|
if(spec.sign == '-')
|
|
{
|
|
const auto &g(generator.aligned_left(spec.width, spec.pad));
|
|
return karma::generate(out, mw[g] | ep, uintptr_t(p));
|
|
}
|
|
|
|
const auto &g(generator.aligned_right(spec.width, spec.pad));
|
|
return karma::generate(out, mw[g] | ep, uintptr_t(p));
|
|
}
|
|
|
|
bool
|
|
ircd::fmt::char_specifier::operator()(char *&out,
|
|
const size_t &max,
|
|
const spec &,
|
|
const arg &val)
|
|
const
|
|
{
|
|
using karma::eps;
|
|
using karma::maxwidth;
|
|
|
|
static const auto throw_illegal([]
|
|
{
|
|
throw illegal("Not a printable character");
|
|
});
|
|
|
|
struct generator
|
|
:karma::grammar<char *, char()>
|
|
{
|
|
karma::rule<char *, char()> printable
|
|
{
|
|
karma::print
|
|
,"character"
|
|
};
|
|
|
|
generator(): generator::base_type{printable} {}
|
|
}
|
|
static const generator;
|
|
|
|
const auto &ptr(get<0>(val));
|
|
const auto &type(get<1>(val));
|
|
if(type == typeid(const char))
|
|
{
|
|
const auto &c(*static_cast<const char *>(ptr));
|
|
karma::generate(out, maxwidth(max)[generator] | eps[throw_illegal], c);
|
|
return true;
|
|
}
|
|
else return false;
|
|
}
|
|
|
|
bool
|
|
ircd::fmt::bool_specifier::operator()(char *&out,
|
|
const size_t &max,
|
|
const spec &,
|
|
const arg &val)
|
|
const
|
|
{
|
|
using karma::eps;
|
|
using karma::maxwidth;
|
|
|
|
static const auto throw_illegal([]
|
|
{
|
|
throw illegal("Failed to print signed value");
|
|
});
|
|
|
|
const auto closure([&](const bool &boolean)
|
|
{
|
|
using karma::maxwidth;
|
|
|
|
struct generator
|
|
:karma::grammar<char *, bool()>
|
|
{
|
|
karma::rule<char *, bool()> rule
|
|
{
|
|
karma::bool_
|
|
,"boolean"
|
|
};
|
|
|
|
generator(): generator::base_type{rule} {}
|
|
}
|
|
static const generator;
|
|
|
|
return karma::generate(out, maxwidth(max)[generator] | eps[throw_illegal], boolean);
|
|
});
|
|
|
|
return !until(types, [&](auto type)
|
|
{
|
|
return !visit_type<decltype(type)>(val, closure);
|
|
});
|
|
}
|
|
|
|
bool
|
|
ircd::fmt::signed_specifier::operator()(char *&out,
|
|
const size_t &max,
|
|
const spec &spec,
|
|
const arg &val)
|
|
const
|
|
{
|
|
static const auto throw_illegal([]
|
|
{
|
|
throw illegal("Failed to print signed value");
|
|
});
|
|
|
|
const auto closure([&out, &max, &spec, &val]
|
|
(const long &integer)
|
|
{
|
|
using karma::long_;
|
|
|
|
struct generator
|
|
:karma::grammar<char *, long()>
|
|
{
|
|
karma::rule<char *, long()> rule
|
|
{
|
|
long_
|
|
,"signed long integer"
|
|
};
|
|
|
|
_r1_type width;
|
|
_r2_type pad;
|
|
karma::rule<char *, long(ushort, char)> aligned_left
|
|
{
|
|
karma::left_align(width, pad)[rule]
|
|
,"left aligned"
|
|
};
|
|
|
|
karma::rule<char *, long(ushort, char)> aligned_right
|
|
{
|
|
karma::right_align(width, pad)[rule]
|
|
,"right aligned"
|
|
};
|
|
|
|
karma::rule<char *, long(ushort, char)> aligned_center
|
|
{
|
|
karma::center(width, pad)[rule]
|
|
,"center aligned"
|
|
};
|
|
|
|
generator(): generator::base_type{rule} {}
|
|
}
|
|
static const generator;
|
|
|
|
const auto &mw(maxwidth(max));
|
|
static const auto &ep(eps[throw_illegal]);
|
|
|
|
if(!spec.width)
|
|
return karma::generate(out, mw[generator] | ep, integer);
|
|
|
|
if(spec.sign == '-')
|
|
{
|
|
const auto &g(generator.aligned_left(spec.width, spec.pad));
|
|
return karma::generate(out, mw[g] | ep, integer);
|
|
}
|
|
|
|
const auto &g(generator.aligned_right(spec.width, spec.pad));
|
|
return karma::generate(out, mw[g] | ep, integer);
|
|
});
|
|
|
|
return !until(types, [&](auto type)
|
|
{
|
|
return !visit_type<decltype(type)>(val, closure);
|
|
});
|
|
}
|
|
|
|
bool
|
|
ircd::fmt::unsigned_specifier::operator()(char *&out,
|
|
const size_t &max,
|
|
const spec &spec,
|
|
const arg &val)
|
|
const
|
|
{
|
|
static const auto throw_illegal([]
|
|
{
|
|
throw illegal("Failed to print unsigned value");
|
|
});
|
|
|
|
const auto closure([&out, &max, &spec, &val]
|
|
(const ulong &integer)
|
|
{
|
|
using karma::ulong_;
|
|
|
|
struct generator
|
|
:karma::grammar<char *, ulong()>
|
|
{
|
|
karma::rule<char *, ulong()> rule
|
|
{
|
|
ulong_
|
|
,"unsigned long integer"
|
|
};
|
|
|
|
_r1_type width;
|
|
_r2_type pad;
|
|
karma::rule<char *, ulong(ushort, char)> aligned_left
|
|
{
|
|
karma::left_align(width, pad)[rule]
|
|
,"left aligned"
|
|
};
|
|
|
|
karma::rule<char *, ulong(ushort, char)> aligned_right
|
|
{
|
|
karma::right_align(width, pad)[rule]
|
|
,"right aligned"
|
|
};
|
|
|
|
karma::rule<char *, ulong(ushort, char)> aligned_center
|
|
{
|
|
karma::center(width, pad)[rule]
|
|
,"center aligned"
|
|
};
|
|
|
|
generator(): generator::base_type{rule} {}
|
|
}
|
|
static const generator;
|
|
|
|
const auto &mw(maxwidth(max));
|
|
static const auto &ep(eps[throw_illegal]);
|
|
|
|
if(!spec.width)
|
|
return karma::generate(out, mw[generator] | ep, integer);
|
|
|
|
if(spec.sign == '-')
|
|
{
|
|
const auto &g(generator.aligned_left(spec.width, spec.pad));
|
|
return karma::generate(out, mw[g] | ep, integer);
|
|
}
|
|
|
|
const auto &g(generator.aligned_right(spec.width, spec.pad));
|
|
return karma::generate(out, mw[g] | ep, integer);
|
|
});
|
|
|
|
return !until(types, [&](auto type)
|
|
{
|
|
return !visit_type<decltype(type)>(val, closure);
|
|
});
|
|
}
|
|
|
|
bool
|
|
ircd::fmt::hex_lowercase_specifier::operator()(char *&out,
|
|
const size_t &max,
|
|
const spec &spec,
|
|
const arg &val)
|
|
const
|
|
{
|
|
static const auto throw_illegal([]
|
|
{
|
|
throw illegal("Failed to print hexadecimal value");
|
|
});
|
|
|
|
const auto closure([&](const ulong &integer)
|
|
{
|
|
using karma::maxwidth;
|
|
|
|
struct generator
|
|
:karma::grammar<char *, ulong()>
|
|
{
|
|
karma::rule<char *, ulong()> rule
|
|
{
|
|
karma::lower[karma::hex]
|
|
,"unsigned lowercase hexadecimal"
|
|
};
|
|
|
|
_r1_type width;
|
|
_r2_type pad;
|
|
karma::rule<char *, ulong(ushort, char)> aligned_left
|
|
{
|
|
karma::left_align(width, pad)[rule]
|
|
,"left aligned"
|
|
};
|
|
|
|
karma::rule<char *, ulong(ushort, char)> aligned_right
|
|
{
|
|
karma::right_align(width, pad)[rule]
|
|
,"right aligned"
|
|
};
|
|
|
|
karma::rule<char *, ulong(ushort, char)> aligned_center
|
|
{
|
|
karma::center(width, pad)[rule]
|
|
,"center aligned"
|
|
};
|
|
|
|
generator(): generator::base_type{rule} {}
|
|
}
|
|
static const generator;
|
|
|
|
const auto &mw(maxwidth(max));
|
|
static const auto &ep(eps[throw_illegal]);
|
|
|
|
if(!spec.width)
|
|
return karma::generate(out, mw[generator] | ep, integer);
|
|
|
|
if(spec.sign == '-')
|
|
{
|
|
const auto &g(generator.aligned_left(spec.width, spec.pad));
|
|
return karma::generate(out, mw[g] | ep, integer);
|
|
}
|
|
|
|
const auto &g(generator.aligned_right(spec.width, spec.pad));
|
|
return karma::generate(out, mw[g] | ep, integer);
|
|
});
|
|
|
|
return !until(types, [&](auto type)
|
|
{
|
|
return !visit_type<decltype(type)>(val, closure);
|
|
});
|
|
}
|
|
|
|
bool
|
|
ircd::fmt::hex_uppercase_specifier::operator()(char *&out,
|
|
const size_t &max,
|
|
const spec &spec,
|
|
const arg &val)
|
|
const
|
|
{
|
|
static const auto throw_illegal([]
|
|
{
|
|
throw illegal("Failed to print hexadecimal value");
|
|
});
|
|
|
|
const auto closure([&](const ulong &integer)
|
|
{
|
|
using karma::maxwidth;
|
|
|
|
struct generator
|
|
:karma::grammar<char *, ulong()>
|
|
{
|
|
karma::rule<char *, ulong()> rule
|
|
{
|
|
karma::upper[karma::hex]
|
|
,"unsigned uppercase hexadecimal"
|
|
};
|
|
|
|
_r1_type width;
|
|
_r2_type pad;
|
|
karma::rule<char *, ulong(ushort, char)> aligned_left
|
|
{
|
|
karma::left_align(width, pad)[rule]
|
|
,"left aligned"
|
|
};
|
|
|
|
karma::rule<char *, ulong(ushort, char)> aligned_right
|
|
{
|
|
karma::right_align(width, pad)[rule]
|
|
,"right aligned"
|
|
};
|
|
|
|
karma::rule<char *, ulong(ushort, char)> aligned_center
|
|
{
|
|
karma::center(width, pad)[rule]
|
|
,"center aligned"
|
|
};
|
|
|
|
generator(): generator::base_type{rule} {}
|
|
}
|
|
static const generator;
|
|
|
|
const auto &mw(maxwidth(max));
|
|
static const auto &ep(eps[throw_illegal]);
|
|
|
|
if(!spec.width)
|
|
return karma::generate(out, mw[generator] | ep, integer);
|
|
|
|
if(spec.sign == '-')
|
|
{
|
|
const auto &g(generator.aligned_left(spec.width, spec.pad));
|
|
return karma::generate(out, mw[g] | ep, integer);
|
|
}
|
|
|
|
const auto &g(generator.aligned_right(spec.width, spec.pad));
|
|
return karma::generate(out, mw[g] | ep, integer);
|
|
});
|
|
|
|
return !until(types, [&](auto type)
|
|
{
|
|
return !visit_type<decltype(type)>(val, closure);
|
|
});
|
|
}
|
|
|
|
//TODO: note long double is narrowed to double for now otherwise
|
|
//TODO: valgrind loops somewhere in here and eats all the system's RAM.
|
|
bool
|
|
ircd::fmt::float_specifier::operator()(char *&out,
|
|
const size_t &max,
|
|
const spec &s,
|
|
const arg &val)
|
|
const
|
|
{
|
|
static const auto throw_illegal([]
|
|
{
|
|
throw illegal("Failed to print floating point value");
|
|
});
|
|
|
|
thread_local uint _precision_;
|
|
_precision_ = s.precision;
|
|
|
|
const auto closure([&](const double &floating)
|
|
{
|
|
using karma::double_;
|
|
using karma::maxwidth;
|
|
|
|
struct generator
|
|
:karma::grammar<char *, double()>
|
|
{
|
|
struct policy
|
|
:karma::real_policies<double>
|
|
{
|
|
static uint precision(const double &)
|
|
{
|
|
return _precision_;
|
|
}
|
|
|
|
static bool trailing_zeros(const double &)
|
|
{
|
|
return _precision_ > 0;
|
|
}
|
|
};
|
|
|
|
karma::rule<char *, double()> rule
|
|
{
|
|
karma::real_generator<double, policy>()
|
|
,"floating point real"
|
|
};
|
|
|
|
generator(): generator::base_type{rule} {}
|
|
}
|
|
static const generator;
|
|
|
|
return karma::generate(out, maxwidth(max)[generator] | eps[throw_illegal], floating);
|
|
});
|
|
|
|
return !until(types, [&](auto type)
|
|
{
|
|
return !visit_type<decltype(type)>(val, closure);
|
|
});
|
|
}
|
|
|
|
bool
|
|
ircd::fmt::string_specifier::operator()(char *&out,
|
|
const size_t &max,
|
|
const spec &spec,
|
|
const arg &val)
|
|
const
|
|
{
|
|
using karma::char_;
|
|
using karma::eps;
|
|
using karma::maxwidth;
|
|
using karma::unused_type;
|
|
|
|
static const auto throw_illegal([]
|
|
{
|
|
throw illegal("Not a printable string");
|
|
});
|
|
|
|
struct generator
|
|
:karma::grammar<char *, const string_view &>
|
|
{
|
|
karma::rule<char *, const string_view &> string
|
|
{
|
|
*(karma::print)
|
|
,"string"
|
|
};
|
|
|
|
_r1_type width;
|
|
_r2_type pad;
|
|
karma::rule<char *, const string_view &(ushort, char)> aligned_left
|
|
{
|
|
karma::left_align(width, pad)[string]
|
|
,"left aligned"
|
|
};
|
|
|
|
karma::rule<char *, const string_view &(ushort, char)> aligned_right
|
|
{
|
|
karma::right_align(width, pad)[string]
|
|
,"right aligned"
|
|
};
|
|
|
|
karma::rule<char *, const string_view &(ushort, char)> aligned_center
|
|
{
|
|
karma::center(width, pad)[string]
|
|
,"center aligned"
|
|
};
|
|
|
|
generator() :generator::base_type{string} {}
|
|
}
|
|
static const generator;
|
|
|
|
const auto &mw(maxwidth(max));
|
|
static const auto &ep(eps[throw_illegal]);
|
|
|
|
if(!spec.width)
|
|
return generate_string(out, mw[generator] | ep, val);
|
|
|
|
if(spec.sign == '-')
|
|
{
|
|
const auto &g(generator.aligned_left(spec.width, spec.pad));
|
|
return generate_string(out, mw[g] | ep, val);
|
|
}
|
|
|
|
const auto &g(generator.aligned_right(spec.width, spec.pad));
|
|
return generate_string(out, mw[g] | ep, val);
|
|
}
|
|
|
|
template<class generator>
|
|
bool
|
|
ircd::fmt::generate_string(char *&out,
|
|
const generator &gen,
|
|
const arg &val)
|
|
{
|
|
using karma::eps;
|
|
|
|
const auto &ptr(get<0>(val));
|
|
const auto &type(get<1>(val));
|
|
if(type == typeid(ircd::string_view) ||
|
|
type == typeid(ircd::json::string) ||
|
|
type == typeid(ircd::json::object) ||
|
|
type == typeid(ircd::json::array))
|
|
{
|
|
const auto &str(*static_cast<const ircd::string_view *>(ptr));
|
|
return karma::generate(out, gen, str);
|
|
}
|
|
else if(type == typeid(std::string_view))
|
|
{
|
|
const auto &str(*static_cast<const std::string_view *>(ptr));
|
|
return karma::generate(out, gen, str);
|
|
}
|
|
else if(type == typeid(std::string))
|
|
{
|
|
const auto &str(*static_cast<const std::string *>(ptr));
|
|
return karma::generate(out, gen, string_view{str});
|
|
}
|
|
else if(type == typeid(const char *))
|
|
{
|
|
const char *const &str{*static_cast<const char *const *>(ptr)};
|
|
return karma::generate(out, gen, string_view{str});
|
|
}
|
|
|
|
// This for string literals which have unique array types depending on their size.
|
|
// There is no reasonable way to match them. The best that can be hoped for is the
|
|
// grammar will fail gracefully (most of the time) or not print something bogus when
|
|
// it happens to be legal.
|
|
const auto &str(static_cast<const char *>(ptr));
|
|
return karma::generate(out, gen, string_view{str});
|
|
}
|