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Reuse parse_format_string in scan

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This commit is contained in:
Victor Zverovich 2019-05-18 13:15:00 -07:00
parent 2346779d6b
commit 4fcd4a4bd0
1 changed files with 17 additions and 19 deletions
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36
test/scan-test.cc
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@ -14,23 +14,10 @@
FMT_BEGIN_NAMESPACE
namespace internal {
struct scan_arg {
int* value;
// TODO: more types
};
template <typename Handler>
void parse_scan_format(string_view format_str, Handler&& handler) {
const char* p = format_str.data();
const char* end = p + format_str.size();
while (p != end) {
char c = *p++;
if (c != '{' || p == end || *p++ != '}')
throw format_error("invalid format string");
handler.on_arg();
}
}
} // namespace internal
struct scan_args {
@ -45,7 +32,7 @@ struct scan_args {
};
namespace internal {
struct scan_handler {
struct scan_handler : error_handler {
const char* begin;
const char* end;
scan_args args;
@ -57,22 +44,33 @@ struct scan_handler {
args(args),
next_arg_id(0) {}
void on_arg() {
void on_text(const char*, const char*) { on_error("invalid format"); }
void on_arg_id() {
if (next_arg_id >= args.size) on_error("argument index out of range");
}
void on_arg_id(unsigned) { on_error("invalid format"); }
void on_arg_id(string_view) { on_error("invalid format"); }
void on_replacement_field(const char*) {
int value = 0;
while (begin != end) {
char c = *begin++;
if (c < '0' || c > '9') throw format_error("invalid input");
if (c < '0' || c > '9') on_error("invalid input");
value = value * 10 + (c - '0');
}
if (next_arg_id >= args.size)
throw format_error("argument index out of range");
*args.data[0].value = value;
}
const char* on_format_specs(const char* begin, const char*) {
return begin;
}
};
} // namespace internal
void vscan(string_view input, string_view format_str, scan_args args) {
internal::parse_scan_format(format_str, internal::scan_handler(input, args));
internal::parse_format_string<false>(format_str,
internal::scan_handler(input, args));
}
template <typename... Args>