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Update std implementation

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This commit is contained in:
Victor Zverovich 2019-02-10 06:34:47 -08:00
parent 442fa1bd46
commit e4572e5def
3 changed files with 50 additions and 46 deletions
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2
include/fmt/core.h
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@ -1337,7 +1337,7 @@ struct char_t : std::enable_if<internal::is_string<S>::value,
namespace internal {
template <typename Context>
FMT_CONSTEXPR basic_format_arg<Context> get_arg(Context& ctx, unsigned id) {
FMT_CONSTEXPR typename Context::format_arg get_arg(Context& ctx, unsigned id) {
auto arg = ctx.arg(id);
if (!arg) ctx.on_error("argument index out of range");
return arg;

2
include/fmt/printf.h
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@ -343,6 +343,7 @@ class basic_printf_context {
public:
/** The character type for the output. */
typedef Char char_type;
typedef basic_format_arg<basic_printf_context> format_arg;
template <typename T> struct formatter_type {
typedef printf_formatter<T> type;
@ -350,7 +351,6 @@ class basic_printf_context {
private:
typedef internal::context_base<OutputIt, basic_printf_context, Char> base;
typedef basic_format_arg<basic_printf_context> format_arg;
typedef basic_format_specs<char_type> format_specs;
OutputIt out_;

92
include/format
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@ -191,9 +191,8 @@ constexpr void basic_format_parse_context<charT>::check_arg_id(size_t) {
namespace std {
template<class O, class charT> FMT_REQUIRES(OutputIterator<O, const charT&>)
class basic_format_context {
basic_format_parse_context<charT> parse_context_; // exposition only
basic_format_args<basic_format_context> args_; // exposition only
O out_; // exposition only
basic_format_args<basic_format_context> args_; // exposition only
O out_; // exposition only
public:
using iterator = O;
@ -202,7 +201,6 @@ namespace std {
template<class T>
using formatter_type = formatter<T>;
basic_format_parse_context<charT>& parse_context() noexcept;
basic_format_arg<basic_format_context> arg(size_t id) const;
iterator out();
@ -210,11 +208,8 @@ namespace std {
// Implementation details:
using format_arg = basic_format_arg<basic_format_context>;
basic_format_context(O out, fmt::string_view fmt, basic_format_args<basic_format_context> args, fmt::internal::locale_ref)
: out_(out), parse_context_({fmt.data(), fmt.size()}), args_(args) {}
basic_format_arg<basic_format_context> next_arg() {
return arg(parse_context_.next_arg_id());
}
basic_format_context(O out, basic_format_args<basic_format_context> args, fmt::internal::locale_ref)
: out_(out), args_(args) {}
fmt::internal::error_handler error_handler() const { return {}; }
basic_format_arg<basic_format_context> arg(fmt::basic_string_view<charT>) const {
return {}; // unused: named arguments are not supported yet
@ -224,9 +219,6 @@ namespace std {
}
namespace std {
template<class O, class charT>
basic_format_parse_context<charT>& basic_format_context<O, charT>::parse_context() noexcept { return parse_context_; }
template<class O, class charT>
basic_format_arg<basic_format_context<O, charT>> basic_format_context<O, charT>::arg(size_t id) const { return args_.get(id); }
@ -360,33 +352,39 @@ template<class Context>
template<class T, typename>
/* explicit */ basic_format_arg<Context>::basic_format_arg(const T& v) noexcept
: value(handle(v)) {}
template<class Context>
/* explicit */ basic_format_arg<Context>::operator bool() const noexcept {
return !holds_alternative<monostate>(value);
}
}
namespace std {
template<class Context>
class basic_format_arg<Context>::handle {
const void* ptr_; // exposition only
void (*format_)(Context&, const void*); // exposition only
void (*format_)(basic_format_parse_context<char_type>&,
Context&, const void*); // exposition only
public:
template<class T> explicit handle(const T& val) noexcept; // exposition only
public:
template<class T> explicit handle(const T& val) noexcept; // exposition only
void format(Context& ctx) const;
void format(basic_format_parse_context<char_type>&, Context& ctx) const;
};
}
namespace std {
template<class Context>
template<class T> /* explicit */ basic_format_arg<Context>::handle::handle(const T& val) noexcept
: ptr_(&val), format_([](Context& ctx, const void* ptr) {
typename Context::template formatter_type<T> f;
ctx.parse_context().advance_to(f.parse(ctx.parse_context()));
ctx.advance_to(f.format(*static_cast<const T*>(ptr), ctx));
: ptr_(&val), format_([](basic_format_parse_context<char_type>& parse_ctx, Context& format_ctx, const void* ptr) {
typename Context::template formatter_type<T> f;
parse_ctx.advance_to(f.parse(parse_ctx));
format_ctx.advance_to(f.format(*static_cast<const T*>(ptr), format_ctx));
}) {}
template<class Context>
void basic_format_arg<Context>::handle::format(Context& ctx) const {
format_(ctx, ptr_);
void basic_format_arg<Context>::handle::format(basic_format_parse_context<char_type>& parse_ctx, Context& format_ctx) const {
format_(parse_ctx, format_ctx, ptr_);
}
// http://fmtlib.net/Text%20Formatting.html#format.visit
@ -460,11 +458,13 @@ class arg_formatter
typename fmt::internal::arg_formatter_base<Range>::iterator>,
public fmt::internal::arg_formatter_base<Range> {
private:
typedef typename Range::value_type char_type;
typedef fmt::internal::arg_formatter_base<Range> base;
typedef std::basic_format_context<typename base::iterator, char_type> context_type;
using char_type = typename Range::value_type;
using base = fmt::internal::arg_formatter_base<Range>;
using format_context = std::basic_format_context<typename base::iterator, char_type>;
using parse_context = basic_format_parse_context<char_type>;
context_type& ctx_;
parse_context& parse_ctx_;
format_context& ctx_;
public:
typedef Range range;
@ -478,14 +478,14 @@ class arg_formatter
*spec* contains format specifier information for standard argument types.
\endrst
*/
explicit arg_formatter(context_type& ctx, fmt::format_specs* spec = FMT_NULL)
: base(Range(ctx.out()), spec, {}), ctx_(ctx) {}
arg_formatter(parse_context& parse_ctx, format_context& ctx, fmt::format_specs* spec = FMT_NULL)
: base(Range(ctx.out()), spec, {}), parse_ctx_(parse_ctx), ctx_(ctx) {}
using base::operator();
/** Formats an argument of a user-defined type. */
iterator operator()(typename std::basic_format_arg<context_type>::handle handle) {
handle.format(ctx_);
iterator operator()(typename std::basic_format_arg<format_context>::handle handle) {
handle.format(parse_ctx_, ctx_);
return this->out();
}
@ -528,16 +528,18 @@ inline fmt::internal::type get_type(basic_format_arg<Context> arg) {
}, arg);
}
template <typename Char, typename Context>
template <typename Context>
class custom_formatter {
private:
Context& ctx_;
using parse_context = basic_format_parse_context<typename Context::char_type>;
parse_context& parse_ctx_;
Context& format_ctx_;
public:
explicit custom_formatter(Context& ctx) : ctx_(ctx) {}
custom_formatter(parse_context& parse_ctx, Context& ctx) : parse_ctx_(parse_ctx), format_ctx_(ctx) {}
bool operator()(typename basic_format_arg<Context>::handle h) const {
h.format(ctx_);
h.format(parse_ctx_, format_ctx_);
return true;
}
@ -551,7 +553,7 @@ struct format_handler : fmt::internal::error_handler {
format_handler(range r, basic_string_view<Char> str,
basic_format_args<Context> format_args,
fmt::internal::locale_ref loc)
: context(r.begin(), str, format_args, loc) {}
: parse_ctx(str), context(r.begin(), format_args, loc) {}
void on_text(const Char* begin, const Char* end) {
auto size = fmt::internal::to_unsigned(end - begin);
@ -561,24 +563,25 @@ struct format_handler : fmt::internal::error_handler {
context.advance_to(out);
}
void on_arg_id() { arg = context.next_arg(); }
void on_arg_id() {
arg = context.arg(parse_ctx.next_arg_id());
}
void on_arg_id(unsigned id) {
context.parse_context().check_arg_id(id);
parse_ctx.check_arg_id(id);
arg = context.arg(id);
}
void on_arg_id(fmt::basic_string_view<Char> id) {}
void on_replacement_field(const Char* p) {
context.parse_context().advance_to(p);
custom_formatter<Char, Context> f(context);
parse_ctx.advance_to(p);
custom_formatter<Context> f(parse_ctx, context);
if (!visit_format_arg(f, arg))
context.advance_to(visit_format_arg(ArgFormatter(context), arg));
context.advance_to(visit_format_arg(ArgFormatter(parse_ctx, context), arg));
}
const Char* on_format_specs(const Char* begin, const Char* end) {
auto& parse_ctx = context.parse_context();
parse_ctx.advance_to(begin);
custom_formatter<Char, Context> f(context);
custom_formatter<Context> f(parse_ctx, context);
if (visit_format_arg(f, arg)) return parse_ctx.begin();
fmt::basic_format_specs<Char> specs;
using fmt::internal::specs_handler;
@ -588,10 +591,11 @@ struct format_handler : fmt::internal::error_handler {
begin = parse_format_specs(begin, end, handler);
if (begin == end || *begin != '}') on_error("missing '}' in format string");
parse_ctx.advance_to(begin);
context.advance_to(visit_format_arg(ArgFormatter(context, &specs), arg));
context.advance_to(visit_format_arg(ArgFormatter(parse_ctx, context, &specs), arg));
return begin;
}
basic_format_parse_context<Char> parse_ctx;
Context context;
basic_format_arg<Context> arg;
};
@ -705,7 +709,7 @@ template<FMT_CONCEPT(OutputIterator<const wchar_t&>) O, class... Args>
template<FMT_CONCEPT(OutputIterator<const char&>) O>
O vformat_to(O out, string_view fmt, format_args_t<O, char> args) {
typedef fmt::output_range<O, char> range;
detail::format_handler<detail::arg_formatter<range>, char, format_context>
detail::format_handler<detail::arg_formatter<range>, char, basic_format_context<O, char>>
h(range(out), fmt, args, {});
fmt::internal::parse_format_string<false>(fmt::to_string_view(fmt), h);
return h.context.out();