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ircd::fmt: Add modular format specifiers.

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This commit is contained in:
Jason Volk 2016-09-16 23:39:44 -07:00
parent d698b8a4a8
commit 2b8bf0a4d1
2 changed files with 102 additions and 39 deletions
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26
include/ircd/fmt.h
View file

@ -31,9 +31,15 @@ IRCD_EXCEPTION(error, fmtstr_invalid);
IRCD_EXCEPTION(error, fmtstr_mismatch);
IRCD_EXCEPTION(error, fmtstr_illegal);
//
// module/internal API
//
extern const char SPECIFIER;
using ptrs = std::vector<const void *>;
using types = std::vector<std::type_index>;
using arg = std::tuple<const void *const &, const std::type_index &>;
struct spec
{
char sign;
@ -43,15 +49,23 @@ struct spec
spec();
};
using ptrs = std::vector<const void *>;
using types = std::vector<std::type_index>;
using arg = std::tuple<const void *const &, const std::type_index &>;
using handler = std::function<bool (char *&, const size_t &, const spec &, const arg &)>;
class specifier
{
std::string name;
public:
virtual bool operator()(char *&out, const size_t &max, const spec &, const arg &) const = 0;
specifier(const std::string &name);
virtual ~specifier() noexcept;
};
const std::map<std::string, specifier *> &specifiers();
ssize_t _snprintf(char *const &, const size_t &, const char *const &, const ptrs &, const types &);
extern std::map<std::string, handler> handlers;
//
// public API
//
template<class... Args>
ssize_t snprintf(char *const &buf, const size_t &max, const char *const &fmt, Args&&... args);

115
ircd/fmt.cc
View file

@ -62,27 +62,45 @@ namespace parse
grammar(qi::rule<it, top> &top_rule);
};
struct specifier
:grammar<const char *, fmt::spec>
{
specifier(): grammar{grammar::spec} {}
}
static const specifier;
}
template<class generator> bool generate_string(char *&out, const generator &, const arg &);
bool handle_nick(char *&out, const size_t &max, const spec &, const arg &);
bool handle_user(char *&out, const size_t &max, const spec &, const arg &);
bool handle_host(char *&out, const size_t &max, const spec &, const arg &);
void handle_specifier(char *&out, const size_t &max, const spec &, const arg &);
bool is_specifier(const std::string &name);
std::map<std::string, handler> handlers
std::map<std::string, specifier *> _specifiers;
struct nick_specifier
:specifier
{
{ "nick", handle_nick },
{ "user", handle_user },
{ "host", handle_host },
bool operator()(char *&out, const size_t &max, const spec &, const arg &) const override;
using specifier::specifier;
}
const nick_specifier
{
"nick"s
};
struct user_specifier
:specifier
{
bool operator()(char *&out, const size_t &max, const spec &, const arg &) const override;
using specifier::specifier;
}
const user_specifier
{
"user"s
};
struct host_specifier
:specifier
{
bool operator()(char *&out, const size_t &max, const spec &, const arg &) const override;
using specifier::specifier;
}
const host_specifier
{
"host"s
};
} // namespace fmt
@ -113,6 +131,22 @@ fmt::parse::grammar<it, top>::grammar(qi::rule<it, top> &top_rule)
})];
}
fmt::specifier::specifier(const std::string &name)
:name{name}
{
const auto iit(_specifiers.emplace(name, this));
if(!iit.second)
throw error("Specifier '%c%s' already registered\n",
SPECIFIER,
name.c_str());
}
fmt::specifier::~specifier()
noexcept
{
_specifiers.erase(name);
}
fmt::spec::spec()
:sign('+')
,width(0)
@ -120,10 +154,16 @@ fmt::spec::spec()
name.reserve(14);
}
const decltype(fmt::_specifiers) &
fmt::specifiers()
{
return _specifiers;
}
bool
fmt::is_specifier(const std::string &name)
{
return handlers.count(name);
return specifiers().count(name);
}
void
@ -134,7 +174,7 @@ fmt::handle_specifier(char *&out,
try
{
const auto &type(get<1>(val));
const auto &handler(handlers.at(spec.name));
const auto &handler(*specifiers().at(spec.name));
if(!handler(out, max, spec, val))
throw fmtstr_mismatch("Invalid type `%s' for format specifier '%c%s'",
type.name(),
@ -143,17 +183,18 @@ try
}
catch(const std::out_of_range &e)
{
throw fmtstr_invalid("Unhandled specifier `%s' in format string",
throw fmtstr_invalid("Unhandled specifier `%c%s' in format string",
SPECIFIER,
spec.name.c_str());
}
bool
fmt::handle_host(char *&out,
const size_t &max,
const spec &spec,
const arg &val)
fmt::host_specifier::operator()(char *&out,
const size_t &max,
const spec &spec,
const arg &val)
const
{
using karma::eps;
using karma::maxwidth;
struct generator
@ -166,12 +207,12 @@ fmt::handle_host(char *&out,
}
bool
fmt::handle_user(char *&out,
const size_t &max,
const spec &spec,
const arg &val)
fmt::user_specifier::operator()(char *&out,
const size_t &max,
const spec &spec,
const arg &val)
const
{
using karma::eps;
using karma::maxwidth;
struct generator
@ -184,12 +225,12 @@ fmt::handle_user(char *&out,
}
bool
fmt::handle_nick(char *&out,
const size_t &max,
const spec &spec,
const arg &val)
fmt::nick_specifier::operator()(char *&out,
const size_t &max,
const spec &spec,
const arg &val)
const
{
using karma::eps;
using karma::maxwidth;
struct generator
@ -262,9 +303,17 @@ try
// Copy literal data from where the last parse stopped up to the found specifier
copy_literal(start);
// Instantiate the format specifier grammar
struct parser
:parse::grammar<const char *, fmt::spec>
{
parser(): grammar{grammar::spec} {}
}
static const parser;
// Parse the specifier with the grammar
fmt::spec spec;
if(!qi::parse(start, end, fmt::parse::specifier, spec))
if(!qi::parse(start, end, parser, spec))
continue;
// Throws if the format string has more specifiers than arguments.