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perf: remove err-msg from combinator

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Generate error message in `parse_something()`, not in `lex_something`.
Since the error message generated by `lex_something` is too difficult to
read for humans, I've disabled the error message generation for the sake
of efficiency (it takes time to generate error message that will never
be read). I think now the error message generation itself safely can be
removed from combinators. At this stage, `lex_something` does not need
to return `result<T, E>` because all the error type would be discarded.
Now it is turned out that returing `optional<T>` from lex_* is enough.
Maybe later I would change the return type itself, but currently I
changed the error type from std::string to char because implementing
optional takes time and effort. It makes the parsing process a bit
faster.
This commit is contained in:
ToruNiina
2019-05-30 20:08:37 +09:00
parent 8bba3c8a14
commit 81abb6c9d7
2 changed files with 52 additions and 88 deletions
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34
toml/parser.hpp
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@@ -376,7 +376,7 @@ parse_ml_basic_string(location<Container>& loc)
// immediate newline is ignored (if exists)
/* discard return value */ lex_newline::invoke(inner_loc);
delim = err("tmp");
delim = err('\0');
while(!delim)
{
using lex_unescaped_seq = repeat<
@@ -432,7 +432,7 @@ parse_basic_string(location<Container>& loc)
std::string retval;
retval.reserve(token.unwrap().size());
quot = err("tmp");
quot = err('\0');
while(!quot)
{
using lex_unescaped_seq = repeat<lex_basic_unescaped, unlimited>;
@@ -587,23 +587,17 @@ parse_local_date(location<Container>& loc)
const auto y = lex_date_fullyear::invoke(inner_loc);
if(!y || inner_loc.iter() == inner_loc.end() || *inner_loc.iter() != '-')
{
const std::string msg = y.map_err_or_else(
[](const std::string& msg) {return msg;}, "should be `-`");
throw internal_error(format_underline("[error]: "
"toml::parse_inner_local_date: invalid year format",
{{std::addressof(inner_loc), msg}}));
{{std::addressof(inner_loc), "should be `-`"}}));
}
inner_loc.advance();
const auto m = lex_date_month::invoke(inner_loc);
if(!m || inner_loc.iter() == inner_loc.end() || *inner_loc.iter() != '-')
{
const std::string msg = m.map_err_or_else(
[](const std::string& msg) {return msg;}, "should be `-`");
throw internal_error(format_underline("[error]: "
"toml::parse_local_date: invalid month format",
{{std::addressof(inner_loc), msg}}));
{{std::addressof(inner_loc), "should be `-`"}}));
}
inner_loc.advance();
const auto d = lex_date_mday::invoke(inner_loc);
@@ -640,23 +634,17 @@ parse_local_time(location<Container>& loc)
const auto h = lex_time_hour::invoke(inner_loc);
if(!h || inner_loc.iter() == inner_loc.end() || *inner_loc.iter() != ':')
{
const std::string msg = h.map_err_or_else(
[](const std::string& msg) {return msg;}, "should be `:`");
throw internal_error(format_underline("[error]: "
"toml::parse_local_time: invalid year format",
{{std::addressof(inner_loc), msg}}));
{{std::addressof(inner_loc), "should be `:`"}}));
}
inner_loc.advance();
const auto m = lex_time_minute::invoke(inner_loc);
if(!m || inner_loc.iter() == inner_loc.end() || *inner_loc.iter() != ':')
{
const std::string msg = m.map_err_or_else(
[](const std::string& msg) {return msg;}, "should be `:`");
throw internal_error(format_underline("[error]: "
"toml::parse_local_time: invalid month format",
{{std::addressof(inner_loc), msg}}));
{{std::addressof(inner_loc), "should be `:`"}}));
}
inner_loc.advance();
const auto s = lex_time_second::invoke(inner_loc);
@@ -724,12 +712,9 @@ parse_local_datetime(location<Container>& loc)
const auto date = parse_local_date(inner_loc);
if(!date || inner_loc.iter() == inner_loc.end())
{
const std::string msg = date.map_err_or_else(
[](const std::string& msg) {return msg;}, "date, not datetime");
throw internal_error(format_underline("[error]: "
"toml::parse_local_datetime: invalid datetime format",
{{std::addressof(inner_loc), msg}}));
{{std::addressof(inner_loc), "date, not datetime"}}));
}
const char delim = *(inner_loc.iter());
if(delim != 'T' && delim != 't' && delim != ' ')
@@ -769,12 +754,9 @@ parse_offset_datetime(location<Container>& loc)
const auto datetime = parse_local_datetime(inner_loc);
if(!datetime || inner_loc.iter() == inner_loc.end())
{
const std::string msg = datetime.map_err_or_else(
[](const std::string& msg){return msg;}, "date, not datetime");
throw internal_error(format_underline("[error]: "
"toml::parse_offset_datetime: invalid datetime format",
{{std::addressof(inner_loc), msg}}));
{{std::addressof(inner_loc), "date, not datetime"}}));
}
time_offset offset(0, 0);
if(const auto ofs = lex_time_numoffset::invoke(inner_loc))