allow parsing toml from a QByteArray

This commit is contained in:
kumquat-ir 2021-04-16 11:02:02 -07:00
parent 42253150e4
commit 860706caec

View File

@ -5,6 +5,7 @@
#include <cstring>
#include <fstream>
#include <sstream>
#include <QByteArray>
#include "combinator.hpp"
#include "lexer.hpp"
@ -2127,6 +2128,49 @@ parse(std::istream& is, const std::string& fname = "unknown file")
return data.unwrap();
}
template<typename Comment = ::toml::discard_comments,
template<typename ...> class Table = std::unordered_map,
template<typename ...> class Array = std::vector>
basic_value<Comment, Table, Array>
parse(QByteArray qba, const std::string& fname = "unknown file")
{
using value_type = basic_value<Comment, Table, Array>;
// convert QByteArray to vector<char>
std::vector<char> letters(qba.begin(), qba.end());
while(!letters.empty() && letters.back() == '\0')
{
letters.pop_back();
}
assert(letters.empty() || letters.back() != '\0');
detail::location loc(std::move(fname), std::move(letters));
// skip BOM if exists.
// XXX component of BOM (like 0xEF) exceeds the representable range of
// signed char, so on some (actually, most) of the environment, these cannot
// be compared to char. However, since we are always out of luck, we need to
// check our chars are equivalent to BOM. To do this, first we need to
// convert char to unsigned char to guarantee the comparability.
if(loc.source()->size() >= 3)
{
std::array<unsigned char, 3> BOM;
std::memcpy(BOM.data(), loc.source()->data(), 3);
if(BOM[0] == 0xEF && BOM[1] == 0xBB && BOM[2] == 0xBF)
{
loc.advance(3); // BOM found. skip.
}
}
const auto data = detail::parse_toml_file<value_type>(loc);
if(!data)
{
throw syntax_error(data.unwrap_err(), source_location(loc));
}
return data.unwrap();
}
template<typename Comment = ::toml::discard_comments,
template<typename ...> class Table = std::unordered_map,
template<typename ...> class Array = std::vector>