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perf: check string type before parsing it

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to avoid unncessary error message generation, check the first some
characters before parsing it. It makes parsing process faster and
is also helpful to generate more accurate error messages.
This commit is contained in:
ToruNiina
2019-04-16 21:47:24 +09:00
parent 4db486d76d
commit c82e76a111
1 changed files with 24 additions and 4 deletions
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28
toml/parser.hpp
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@@ -539,10 +539,30 @@ template<typename Container>
result<std::pair<toml::string, region<Container>>, std::string>
parse_string(location<Container>& loc)
{
if(const auto rslt = parse_ml_basic_string(loc)) {return rslt;}
if(const auto rslt = parse_ml_literal_string(loc)) {return rslt;}
if(const auto rslt = parse_basic_string(loc)) {return rslt;}
if(const auto rslt = parse_literal_string(loc)) {return rslt;}
if(loc.iter() != loc.end() && *(loc.iter()) == '"')
{
if(loc.iter() + 1 != loc.end() && *(loc.iter() + 1) == '"' &&
loc.iter() + 2 != loc.end() && *(loc.iter() + 2) == '"')
{
return parse_ml_basic_string(loc);
}
else
{
return parse_basic_string(loc);
}
}
else if(loc.iter() != loc.end() && *(loc.iter()) == '\'')
{
if(loc.iter() + 1 != loc.end() && *(loc.iter() + 1) == '\'' &&
loc.iter() + 2 != loc.end() && *(loc.iter() + 2) == '\'')
{
return parse_ml_literal_string(loc);
}
else
{
return parse_literal_string(loc);
}
}
return err(format_underline("[error] toml::parse_string: ",
{{std::addressof(loc), "the next token is not a string"}}));
}