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Add initial specifier support to scan

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This commit is contained in:
Victor Zverovich 2023-12-29 07:15:02 -08:00
parent bfba2f9e92
commit d83c1b8d4a
1 changed files with 43 additions and 5 deletions
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48
test/scan.h
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@ -387,6 +387,34 @@ struct scan_args {
namespace detail {
const char* parse_scan_specs(
const char* begin, const char* end, format_specs<>& specs, scan_type) {
while (begin != end) {
switch (to_ascii(*begin)) {
// TODO: parse scan format specifiers
case 'x':
specs.type = presentation_type::hex_lower;
break;
case '}':
return begin;
}
}
return begin;
}
struct arg_scanner {
using iterator = scan_buffer::iterator;
iterator begin;
iterator end;
const format_specs<>& specs;
template <typename T>
auto operator()(T) -> iterator {
return begin;
}
};
struct scan_handler : error_handler {
private:
scan_parse_context parse_ctx_;
@ -502,11 +530,21 @@ struct scan_handler : error_handler {
scan_ctx_.advance_to(it);
}
auto on_format_specs(int, const char* begin, const char*) -> const char* {
if (arg_.type != scan_type::custom_type) return begin;
parse_ctx_.advance_to(begin);
arg_.custom.scan(arg_.custom.value, parse_ctx_, scan_ctx_);
return parse_ctx_.begin();
auto on_format_specs(int, const char* begin, const char* end) -> const char* {
if (arg_.type == scan_type::custom_type) {
parse_ctx_.advance_to(begin);
arg_.custom.scan(arg_.custom.value, parse_ctx_, scan_ctx_);
return parse_ctx_.begin();
}
auto specs = format_specs<>();
begin = parse_scan_specs(begin, end, specs, arg_.type);
if (begin == end || *begin != '}')
on_error("missing '}' in format string");
auto s = arg_scanner{scan_ctx_.begin(), scan_ctx_.end(), specs};
// TODO: scan argument according to specs
(void)s;
//context.advance_to(visit_format_arg(s, arg));
return begin;
}
void on_error(const char* message) {