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Optimize format handler

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This commit is contained in:
Victor Zverovich
2020-06-06 06:54:24 -07:00
parent d9e3d6e6ed
commit 09737dd83b
2 changed files with 20 additions and 19 deletions
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26
include/fmt/format.h
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@@ -2546,9 +2546,12 @@ FMT_CONSTEXPR const typename ParseContext::char_type* parse_format_specs(
template <typename ArgFormatter, typename Char, typename Context>
struct format_handler : detail::error_handler {
using iterator = typename ArgFormatter::iterator;
basic_format_parse_context<Char> parse_context;
Context context;
int arg_id;
format_handler(iterator out, basic_string_view<Char> str,
format_handler(typename ArgFormatter::iterator out,
basic_string_view<Char> str,
basic_format_args<Context> format_args, detail::locale_ref loc)
: parse_context(str), context(out, format_args, loc) {}
@@ -2560,25 +2563,23 @@ struct format_handler : detail::error_handler {
context.advance_to(out);
}
template <typename ID> void get_arg(ID id) {
arg = detail::get_arg(context, id);
}
void on_arg_id() { get_arg(parse_context.next_arg_id()); }
void on_arg_id() { arg_id = parse_context.next_arg_id(); }
void on_arg_id(int id) {
parse_context.check_arg_id(id);
get_arg(id);
arg_id = id;
}
void on_arg_id(basic_string_view<Char> id) { get_arg(id); }
void on_arg_id(basic_string_view<Char> id) { arg_id = context.arg_id(id); }
void on_replacement_field(const Char* p) {
advance_to(parse_context, p);
auto arg = get_arg(context, arg_id);
context.advance_to(
visit_format_arg(ArgFormatter(context, &parse_context), arg));
}
const Char* on_format_specs(const Char* begin, const Char* end) {
advance_to(parse_context, begin);
auto arg = get_arg(context, arg_id);
detail::custom_formatter<Context> f(parse_context, context);
if (visit_format_arg(f, arg)) return parse_context.begin();
basic_format_specs<Char> specs;
@@ -2594,10 +2595,6 @@ struct format_handler : detail::error_handler {
visit_format_arg(ArgFormatter(context, &parse_context, &specs), arg));
return begin;
}
basic_format_parse_context<Char> parse_context;
Context context;
basic_format_arg<Context> arg;
};
// A parse context with extra argument id checks. It is only used at compile
@@ -3143,7 +3140,8 @@ typename Context::iterator vformat_to(
typename ArgFormatter::iterator out, basic_string_view<Char> format_str,
basic_format_args<Context> args,
detail::locale_ref loc = detail::locale_ref()) {
detail::format_handler<ArgFormatter, Char, Context> h(out, format_str, args, loc);
detail::format_handler<ArgFormatter, Char, Context> h(out, format_str, args,
loc);
if (format_str.size() == 2 && detail::equal2(format_str.data(), "{}")) {
auto arg = detail::get_arg(h.context, 0);
h.parse_context.advance_to(&format_str[1]);