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82e8c1e68b
when ""_toml literal is used with C++11 raw-string literal,
it normally starts with newline like the following.
```cpp
const auto v = u8R"(
[table]
key = "value"
)"_toml;
```
With this, the error message shows the first empty line that starts just
after `u8R"(` and thus the error message shows nothing. To avoid this,
skip the first empty lines and whitespaces in literal.
92 lines
3.0 KiB
C++
92 lines
3.0 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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// to distinguish arrays and tables, first check it is a table or not.
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//
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// "[1,2,3]"_toml; // this is an array
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// "[table]"_toml; // a table that has an empty table named "table" inside.
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// "[[1,2,3]]"_toml; // this is an array of arrays
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// "[[table]]"_toml; // this is a table that has an array of tables inside.
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//
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// "[[1]]"_toml; // this can be both... (currently it becomes a table)
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// "1 = [{}]"_toml; // this is a table that has an array of table named 1.
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// "[[1,]]"_toml; // this is an array of arrays.
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// "[[1],]"_toml; // this also.
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const auto the_front = loc.iter();
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const bool is_table_key = ::toml::detail::lex_std_table::invoke(loc);
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loc.reset(the_front);
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const bool is_aots_key = ::toml::detail::lex_array_table::invoke(loc);
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loc.reset(the_front);
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// If it is neither a table-key or a array-of-table-key, it may be a value.
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if(!is_table_key && !is_aots_key)
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{
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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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}
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// Note that still it can be a table, because the literal might be something
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// like the following.
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// ```cpp
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// R"( // c++11 raw string literals
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// key = "value"
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// int = 42
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// )"_toml;
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// ```
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// It is a valid toml file.
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// It should be parsed as if we parse a file with this content.
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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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// skip needless characters for error message
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skip_line::invoke(loc); // skip the first several needless lines
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skip_ws::invoke(loc); // skip the first several needless whitespaces
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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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