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6f950c9ec8
`location::line_num()` function used to be implemented by using `std::count`, so each time the parser encounters a type mismatch, `std::count` was called with almost whole file. It decelerates the parsing process too much, so I decided to add `line_number_` member variable to `location` and add `advance/retrace/reset` to `location` in order to modify the position that is pointed.
56 lines
1.7 KiB
C++
56 lines
1.7 KiB
C++
// Copyright Toru Niina 2019.
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// Distributed under the MIT License.
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#ifndef TOML11_LITERAL_HPP
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#define TOML11_LITERAL_HPP
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#include "parser.hpp"
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namespace toml
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{
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inline namespace literals
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{
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inline namespace toml_literals
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{
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inline ::toml::value operator""_toml(const char* str, std::size_t len)
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{
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::toml::detail::location<std::vector<char>>
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loc(/* filename = */ std::string("TOML literal encoded in a C++ code"),
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/* contents = */ std::vector<char>(str, str + len));
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// if there are some comments or empty lines, skip them.
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using skip_line = ::toml::detail::repeat<toml::detail::sequence<
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::toml::detail::maybe<::toml::detail::lex_ws>,
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::toml::detail::maybe<::toml::detail::lex_comment>,
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::toml::detail::lex_newline
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>, ::toml::detail::at_least<1>>;
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skip_line::invoke(loc);
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// if there are some whitespaces before a value, skip them.
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using skip_ws = ::toml::detail::repeat<
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::toml::detail::lex_ws, ::toml::detail::at_least<1>>;
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skip_ws::invoke(loc);
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// literal may be a bare value. try them first.
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if(auto data = ::toml::detail::parse_value(loc))
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{
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return data.unwrap();
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}
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// literal is a TOML file (i.e. multiline table).
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if(auto data = ::toml::detail::parse_toml_file(loc))
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{
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loc.reset(loc.begin()); // rollback to the top of the literal
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return ::toml::value(std::move(data.unwrap()),
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::toml::detail::region<std::vector<char>>(std::move(loc)));
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}
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else // none of them.
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{
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throw ::toml::syntax_error(data.unwrap_err());
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}
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}
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} // toml_literals
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} // literals
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} // toml
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#endif//TOML11_LITERAL_HPP
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