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https://github.com/fmtlib/fmt.git
synced 2025-07-31 19:24:48 +02:00
Cleanup the printf implementation
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@@ -25,34 +25,25 @@ class basic_printf_parse_context : public basic_format_parse_context<Char> {
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};
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template <typename OutputIt, typename Char> class basic_printf_context {
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private:
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OutputIt out_;
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basic_format_args<basic_printf_context> args_;
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public:
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/** The character type for the output. */
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using char_type = Char;
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using iterator = OutputIt;
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using format_arg = basic_format_arg<basic_printf_context>;
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using parse_context_type = basic_printf_parse_context<Char>;
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template <typename T> using formatter_type = printf_formatter<T>;
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private:
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using format_specs = basic_format_specs<char_type>;
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OutputIt out_;
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basic_format_args<basic_printf_context> args_;
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parse_context_type parse_ctx_;
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static void parse_flags(format_specs& specs, const Char*& it,
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const Char* end);
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public:
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/**
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\rst
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Constructs a ``printf_context`` object. References to the arguments are
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stored in the context object so make sure they have appropriate lifetimes.
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\endrst
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*/
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basic_printf_context(OutputIt out, basic_string_view<char_type> format_str,
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basic_printf_context(OutputIt out,
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basic_format_args<basic_printf_context> args)
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: out_(out), args_(args), parse_ctx_(format_str) {}
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: out_(out), args_(args) {}
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OutputIt out() { return out_; }
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void advance_to(OutputIt it) { out_ = it; }
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@@ -61,14 +52,8 @@ template <typename OutputIt, typename Char> class basic_printf_context {
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format_arg arg(int id) const { return args_.get(id); }
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// Returns the argument with specified index or, if arg_index is -1, the next
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// argument.
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format_arg get_arg(int arg_index = -1);
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parse_context_type& parse_context() { return parse_ctx_; }
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FMT_CONSTEXPR void on_error(const char* message) {
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parse_ctx_.on_error(message);
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detail::error_handler().on_error(message);
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}
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};
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@@ -306,7 +291,9 @@ class printf_arg_formatter : public arg_formatter<Char> {
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/** Formats an argument of a custom (user-defined) type. */
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OutputIt operator()(typename basic_format_arg<context_type>::handle handle) {
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handle.format(context_.parse_context(), context_);
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auto parse_ctx =
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basic_printf_parse_context<Char>(basic_string_view<Char>());
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handle.format(parse_ctx, context_);
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return this->out;
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}
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};
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@@ -371,7 +358,7 @@ int parse_header(const Char*& it, const Char* end,
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} else if (*it == '*') {
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++it;
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specs.width = static_cast<int>(visit_format_arg(
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detail::printf_width_handler<Char>(specs), get_arg()));
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detail::printf_width_handler<Char>(specs), get_arg(-1)));
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}
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}
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return arg_index;
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@@ -382,8 +369,19 @@ void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
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basic_format_args<Context> args) {
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using OutputIt = buffer_appender<Char>;
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auto out = OutputIt(buf);
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auto context = basic_printf_context<OutputIt, Char>(out, format, args);
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auto& parse_ctx = context.parse_context();
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auto context = basic_printf_context<OutputIt, Char>(out, args);
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auto parse_ctx = basic_printf_parse_context<Char>(format);
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// Returns the argument with specified index or, if arg_index is -1, the next
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// argument.
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auto get_arg = [&](int arg_index) {
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if (arg_index < 0)
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arg_index = parse_ctx.next_arg_id();
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else
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parse_ctx.check_arg_id(--arg_index);
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return detail::get_arg(context, arg_index);
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};
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const Char* start = parse_ctx.begin();
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const Char* end = parse_ctx.end();
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auto it = start;
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@@ -406,8 +404,7 @@ void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
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specs.align = align::right;
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// Parse argument index, flags and width.
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int arg_index =
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parse_header(it, end, specs, [&]() { return context.get_arg(); });
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int arg_index = parse_header(it, end, specs, get_arg);
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if (arg_index == 0) parse_ctx.on_error("argument not found");
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// Parse precision.
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@@ -419,14 +416,14 @@ void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
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specs.precision = parse_nonnegative_int(it, end, eh);
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} else if (c == '*') {
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++it;
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specs.precision = static_cast<int>(visit_format_arg(
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detail::printf_precision_handler(), context.get_arg()));
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specs.precision = static_cast<int>(
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visit_format_arg(detail::printf_precision_handler(), get_arg(-1)));
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} else {
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specs.precision = 0;
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}
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}
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auto arg = context.get_arg(arg_index);
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auto arg = get_arg(arg_index);
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// For d, i, o, u, x, and X conversion specifiers, if a precision is
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// specified, the '0' flag is ignored
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if (specs.precision >= 0 && arg.is_integral())
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@@ -520,16 +517,6 @@ void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
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}
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FMT_END_DETAIL_NAMESPACE
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template <typename OutputIt, typename Char>
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typename basic_printf_context<OutputIt, Char>::format_arg
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basic_printf_context<OutputIt, Char>::get_arg(int arg_index) {
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if (arg_index < 0)
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arg_index = parse_ctx_.next_arg_id();
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else
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parse_ctx_.check_arg_id(--arg_index);
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return detail::get_arg(*this, arg_index);
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}
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template <typename Char>
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using basic_printf_context_t =
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basic_printf_context<detail::buffer_appender<Char>, Char>;
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