83315a3912
also: - significantly improved the performance of toml::parse_file - improved the performance of printing to streams for deepy-nested TOML data - simplified some of the examples - added more tests - cleaned up some of the test code
389 lines
11 KiB
C++
389 lines
11 KiB
C++
//# This file is a part of toml++ and is subject to the the terms of the MIT license.
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//# Copyright (c) 2019-2020 Mark Gillard <mark.gillard@outlook.com.au>
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//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
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// SPDX-License-Identifier: MIT
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#pragma once
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#include "toml_formatter.h"
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#include "toml_table.h"
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#include "toml_array.h"
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#include "toml_utf8.h"
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TOML_PUSH_WARNINGS
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TOML_DISABLE_SWITCH_WARNINGS
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TOML_DISABLE_PADDING_WARNINGS
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namespace toml::impl
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{
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[[nodiscard]] TOML_API
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toml::string default_formatter_make_key_segment(const toml::string& str) noexcept;
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[[nodiscard]] TOML_API
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size_t default_formatter_inline_columns(const node& node) noexcept;
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[[nodiscard]] TOML_API
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bool default_formatter_forces_multiline(const node& node, size_t starting_column_bias = 0) noexcept;
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}
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namespace toml
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{
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template <typename T, typename U>
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std::basic_ostream<T>& operator << (std::basic_ostream<T>&, default_formatter<U>&);
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template <typename T, typename U>
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std::basic_ostream<T>& operator << (std::basic_ostream<T>&, default_formatter<U>&&);
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/// \brief A wrapper for printing TOML objects out to a stream as formatted TOML.
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///
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/// \remarks You generally don't need to create an instance of this class explicitly; the stream
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/// operators of the TOML node types already print themselves out using this formatter.
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///
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/// \detail \cpp
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/// auto tbl = toml::table{{
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/// { "description", "This is some TOML, yo." },
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/// { "fruit", toml::array{ "apple", "orange", "pear" } },
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/// { "numbers", toml::array{ 1, 2, 3, 4, 5 } },
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/// { "table", toml::table{{ { "foo", "bar" } }} }
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/// }};
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///
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/// // these two lines are equivalent:
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/// std::cout << toml::default_formatter{ tbl } << std::endl;
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/// std::cout << tbl << std::endl;
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///
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/// \ecpp
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///
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/// \out
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/// description = "This is some TOML, yo."
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/// fruit = ["apple", "orange", "pear"]
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/// numbers = [1, 2, 3, 4, 5]
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///
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/// [table]
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/// foo = "bar"
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/// \eout
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///
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/// \tparam Char The underlying character type of the output stream. Must be 1 byte in size.
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template <typename Char = char>
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class TOML_API default_formatter final : impl::formatter<Char>
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{
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private:
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using base = impl::formatter<Char>;
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std::vector<toml::string> key_path;
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void print_key_segment(const toml::string& str)
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{
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if (str.empty())
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impl::print_to_stream("''"sv, base::stream());
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else
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{
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bool requiresQuotes = false;
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{
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impl::utf8_decoder decoder;
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for (size_t i = 0; i < str.length() && !requiresQuotes; i++)
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{
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decoder(static_cast<uint8_t>(str[i]));
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if (decoder.error())
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requiresQuotes = true;
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else if (decoder.has_code_point())
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requiresQuotes = !impl::is_bare_key_character(decoder.codepoint);
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}
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}
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if (requiresQuotes)
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base::print_quoted_string(str);
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else
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impl::print_to_stream(str, base::stream());
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}
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base::clear_naked_newline();
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}
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void print_key_path()
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{
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for (const auto& segment : key_path)
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{
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if (std::addressof(segment) > key_path.data())
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impl::print_to_stream('.', base::stream());
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impl::print_to_stream(segment, base::stream());
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}
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base::clear_naked_newline();
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}
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void print_inline(const table& /*tbl*/);
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void print(const array& arr)
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{
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if (arr.empty())
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impl::print_to_stream("[]"sv, base::stream());
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else
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{
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const auto original_indent = base::indent();
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const auto multiline = impl::default_formatter_forces_multiline(
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arr,
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base::indent_columns * static_cast<size_t>(original_indent < 0 ? 0 : original_indent)
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);
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impl::print_to_stream("["sv, base::stream());
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if (multiline)
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{
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if (original_indent < 0)
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base::indent(0);
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base::increase_indent();
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}
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else
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impl::print_to_stream(' ', base::stream());
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for (size_t i = 0; i < arr.size(); i++)
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{
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if (i > 0_sz)
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{
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impl::print_to_stream(',', base::stream());
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if (!multiline)
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impl::print_to_stream(' ', base::stream());
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}
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if (multiline)
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{
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base::print_newline(true);
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base::print_indent();
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}
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auto& v = arr[i];
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const auto type = v.type();
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TOML_ASSUME(type != node_type::none);
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switch (type)
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{
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case node_type::table: print_inline(*reinterpret_cast<const table*>(&v)); break;
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case node_type::array: print(*reinterpret_cast<const array*>(&v)); break;
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default:
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base::print_value(v, type);
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}
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}
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if (multiline)
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{
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base::indent(original_indent);
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base::print_newline(true);
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base::print_indent();
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}
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else
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impl::print_to_stream(' ', base::stream());
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impl::print_to_stream("]"sv, base::stream());
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}
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base::clear_naked_newline();
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}
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void print(const table& tbl)
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{
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static constexpr auto is_non_inline_array_of_tables = [](auto&& nde) noexcept
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{
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auto arr = nde.as_array();
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return arr
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&& arr->is_array_of_tables()
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&& !arr->template get_as<table>(0_sz)->is_inline();
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};
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//values, arrays, and inline tables/table arrays
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for (auto&& [k, v] : tbl)
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{
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const auto type = v.type();
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if ((type == node_type::table && !reinterpret_cast<const table*>(&v)->is_inline())
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|| (type == node_type::array && is_non_inline_array_of_tables(v)))
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continue;
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base::print_newline();
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base::print_indent();
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print_key_segment(k);
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impl::print_to_stream(" = "sv, base::stream());
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TOML_ASSUME(type != node_type::none);
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switch (type)
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{
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case node_type::table: print_inline(*reinterpret_cast<const table*>(&v)); break;
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case node_type::array: print(*reinterpret_cast<const array*>(&v)); break;
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default:
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base::print_value(v, type);
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}
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}
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//non-inline tables
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for (auto&& [k, v] : tbl)
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{
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const auto type = v.type();
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if (type != node_type::table || reinterpret_cast<const table*>(&v)->is_inline())
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continue;
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auto& child_tbl = *reinterpret_cast<const table*>(&v);
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//we can skip indenting and emitting the headers for tables that only contain other tables
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//(so we don't over-nest)
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size_t child_value_count{}; //includes inline tables and non-table arrays
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size_t child_table_count{};
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size_t child_table_array_count{};
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for (auto&& [child_k, child_v] : child_tbl)
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{
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(void)child_k;
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const auto child_type = child_v.type();
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TOML_ASSUME(child_type != node_type::none);
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switch (child_type)
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{
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case node_type::table:
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if (reinterpret_cast<const table*>(&child_v)->is_inline())
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child_value_count++;
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else
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child_table_count++;
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break;
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case node_type::array:
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if (is_non_inline_array_of_tables(child_v))
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child_table_array_count++;
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else
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child_value_count++;
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break;
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default:
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child_value_count++;
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}
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}
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bool skip_self = false;
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if (child_value_count == 0_sz && (child_table_count > 0_sz || child_table_array_count > 0_sz))
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skip_self = true;
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if (!skip_self)
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base::increase_indent();
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key_path.push_back(impl::default_formatter_make_key_segment(k));
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if (!skip_self)
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{
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base::print_newline();
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base::print_newline(true);
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base::print_indent();
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impl::print_to_stream("["sv, base::stream());
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print_key_path();
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impl::print_to_stream("]"sv, base::stream());
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base::print_newline(true);
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}
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print(child_tbl);
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key_path.pop_back();
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if (!skip_self)
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base::decrease_indent();
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}
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//table arrays
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for (auto&& [k, v] : tbl)
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{
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if (!is_non_inline_array_of_tables(v))
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continue;
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auto& arr = *reinterpret_cast<const array*>(&v);
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base::increase_indent();
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key_path.push_back(impl::default_formatter_make_key_segment(k));
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for (size_t i = 0; i < arr.size(); i++)
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{
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base::print_newline();
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base::print_newline(true);
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base::print_indent();
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impl::print_to_stream("[["sv, base::stream());
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print_key_path();
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impl::print_to_stream("]]"sv, base::stream());
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base::print_newline(true);
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print(*reinterpret_cast<const table*>(&arr[i]));
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}
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key_path.pop_back();
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base::decrease_indent();
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}
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}
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void print()
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{
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switch (auto source_type = base::source().type())
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{
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case node_type::table:
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{
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auto& tbl = *reinterpret_cast<const table*>(&base::source());
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if (tbl.is_inline())
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print_inline(tbl);
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else
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{
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base::decrease_indent(); // so root kvps and tables have the same indent
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print(tbl);
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}
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break;
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}
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case node_type::array:
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print(*reinterpret_cast<const array*>(&base::source()));
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break;
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default:
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base::print_value(base::source(), source_type);
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}
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}
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public:
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/// \brief Constructs a default formatter and binds it to a TOML object.
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///
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/// \param source The source TOML object.
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/// \param flags Format option flags.
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TOML_NODISCARD_CTOR
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explicit default_formatter(const toml::node& source, format_flags flags = {}) noexcept
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: base{ source, flags }
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{}
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template <typename T, typename U>
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friend std::basic_ostream<T>& operator << (std::basic_ostream<T>&, default_formatter<U>&);
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template <typename T, typename U>
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friend std::basic_ostream<T>& operator << (std::basic_ostream<T>&, default_formatter<U>&&);
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};
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#if !TOML_ALL_INLINE
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extern template class TOML_API default_formatter<char>;
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#endif
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default_formatter(const table&) -> default_formatter<char>;
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default_formatter(const array&) -> default_formatter<char>;
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template <typename T> default_formatter(const value<T>&) -> default_formatter<char>;
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/// \brief Prints the bound TOML object out to the stream as formatted TOML.
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template <typename T, typename U>
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TOML_EXTERNAL_LINKAGE
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std::basic_ostream<T>& operator << (std::basic_ostream<T>& lhs, default_formatter<U>& rhs)
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{
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rhs.attach(lhs);
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rhs.key_path.clear();
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rhs.print();
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rhs.detach();
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return lhs;
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}
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/// \brief Prints the bound TOML object out to the stream as formatted TOML (rvalue overload).
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template <typename T, typename U>
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TOML_EXTERNAL_LINKAGE
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std::basic_ostream<T>& operator << (std::basic_ostream<T>& lhs, default_formatter<U>&& rhs)
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{
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return lhs << rhs; //as lvalue
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}
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template <typename Char>
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TOML_EXTERNAL_LINKAGE
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std::basic_ostream<Char>& operator << (std::basic_ostream<Char>& lhs, const table& rhs)
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{
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return lhs << default_formatter<Char>{ rhs };
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}
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template <typename Char>
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TOML_EXTERNAL_LINKAGE
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std::basic_ostream<Char>& operator << (std::basic_ostream<Char>& lhs, const array& rhs)
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{
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return lhs << default_formatter<Char>{ rhs };
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}
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#if !TOML_ALL_INLINE
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extern template TOML_API std::ostream& operator << (std::ostream&, default_formatter<char>&);
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extern template TOML_API std::ostream& operator << (std::ostream&, default_formatter<char>&&);
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extern template TOML_API std::ostream& operator << (std::ostream&, const table&);
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extern template TOML_API std::ostream& operator << (std::ostream&, const array&);
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#endif
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}
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TOML_POP_WARNINGS // TOML_DISABLE_SWITCH_WARNINGS, TOML_DISABLE_PADDING_WARNINGS
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