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Diffstat (limited to 'src/toml11/toml/literal.hpp')
| -rw-r--r-- | src/toml11/toml/literal.hpp | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/src/toml11/toml/literal.hpp b/src/toml11/toml/literal.hpp new file mode 100644 index 000000000..04fbbc13e --- /dev/null +++ b/src/toml11/toml/literal.hpp @@ -0,0 +1,113 @@ +// Copyright Toru Niina 2019. +// Distributed under the MIT License. +#ifndef TOML11_LITERAL_HPP +#define TOML11_LITERAL_HPP +#include "parser.hpp" + +namespace toml +{ +inline namespace literals +{ +inline namespace toml_literals +{ + +// implementation +inline ::toml::basic_value<TOML11_DEFAULT_COMMENT_STRATEGY, std::unordered_map, std::vector> +literal_internal_impl(::toml::detail::location loc) +{ + using value_type = ::toml::basic_value< + TOML11_DEFAULT_COMMENT_STRATEGY, std::unordered_map, std::vector>; + // if there are some comments or empty lines, skip them. + using skip_line = ::toml::detail::repeat<toml::detail::sequence< + ::toml::detail::maybe<::toml::detail::lex_ws>, + ::toml::detail::maybe<::toml::detail::lex_comment>, + ::toml::detail::lex_newline + >, ::toml::detail::at_least<1>>; + skip_line::invoke(loc); + + // if there are some whitespaces before a value, skip them. + using skip_ws = ::toml::detail::repeat< + ::toml::detail::lex_ws, ::toml::detail::at_least<1>>; + skip_ws::invoke(loc); + + // to distinguish arrays and tables, first check it is a table or not. + // + // "[1,2,3]"_toml; // this is an array + // "[table]"_toml; // a table that has an empty table named "table" inside. + // "[[1,2,3]]"_toml; // this is an array of arrays + // "[[table]]"_toml; // this is a table that has an array of tables inside. + // + // "[[1]]"_toml; // this can be both... (currently it becomes a table) + // "1 = [{}]"_toml; // this is a table that has an array of table named 1. + // "[[1,]]"_toml; // this is an array of arrays. + // "[[1],]"_toml; // this also. + + const auto the_front = loc.iter(); + + const bool is_table_key = ::toml::detail::lex_std_table::invoke(loc); + loc.reset(the_front); + + const bool is_aots_key = ::toml::detail::lex_array_table::invoke(loc); + loc.reset(the_front); + + // If it is neither a table-key or a array-of-table-key, it may be a value. + if(!is_table_key && !is_aots_key) + { + if(auto data = ::toml::detail::parse_value<value_type>(loc)) + { + return data.unwrap(); + } + } + + // Note that still it can be a table, because the literal might be something + // like the following. + // ```cpp + // R"( // c++11 raw string literals + // key = "value" + // int = 42 + // )"_toml; + // ``` + // It is a valid toml file. + // It should be parsed as if we parse a file with this content. + + if(auto data = ::toml::detail::parse_toml_file<value_type>(loc)) + { + return data.unwrap(); + } + else // none of them. + { + throw ::toml::syntax_error(data.unwrap_err(), source_location(loc)); + } + +} + +inline ::toml::basic_value<TOML11_DEFAULT_COMMENT_STRATEGY, std::unordered_map, std::vector> +operator"" _toml(const char* str, std::size_t len) +{ + ::toml::detail::location loc( + std::string("TOML literal encoded in a C++ code"), + std::vector<char>(str, str + len)); + // literal length does not include the null character at the end. + return literal_internal_impl(std::move(loc)); +} + +// value of __cplusplus in C++2a/20 mode is not fixed yet along compilers. +// So here we use the feature test macro for `char8_t` itself. +#if defined(__cpp_char8_t) && __cpp_char8_t >= 201811L +// value of u8"" literal has been changed from char to char8_t and char8_t is +// NOT compatible to char +inline ::toml::basic_value<TOML11_DEFAULT_COMMENT_STRATEGY, std::unordered_map, std::vector> +operator"" _toml(const char8_t* str, std::size_t len) +{ + ::toml::detail::location loc( + std::string("TOML literal encoded in a C++ code"), + std::vector<char>(reinterpret_cast<const char*>(str), + reinterpret_cast<const char*>(str) + len)); + return literal_internal_impl(std::move(loc)); +} +#endif + +} // toml_literals +} // literals +} // toml +#endif//TOML11_LITERAL_HPP |