tomlplusplus/examples/toml_generator.cpp

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// This file is a part of toml++ and is subject to the the terms of the MIT license.
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// Copyright (c) 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.
// SPDX-License-Identifier: MIT
// This example demonstrates the use of some more advanced features to generate a tree of random TOML data.
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#include "examples.h"
#define TOML_PARSER 0
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#include <toml++/toml.h>
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using namespace std::string_view_literals;
namespace
{
inline constexpr auto words = std::array{
"acceptable"sv, "contain"sv, "ghost"sv, "mark"sv, "respect"sv, "taboo"sv,
"actually"sv, "cream"sv, "gleaming"sv, "meaty"sv, "rest"sv, "tacky"sv,
"addition"sv, "creature"sv, "glorious"sv, "memory"sv, "rice"sv, "tank"sv,
"adhesive"sv, "crime"sv, "gold"sv, "messy"sv, "rich"sv, "tent"sv,
"adorable"sv, "cross"sv, "grandfather"sv, "miss"sv, "righteous"sv, "terrible"sv,
"advise"sv, "crowded"sv, "gusty"sv, "modern"sv, "room"sv, "threatening"sv,
"afraid"sv, "crown"sv, "haircut"sv, "morning"sv, "rotten"sv, "three"sv,
"ancient"sv, "cure"sv, "hard-to-find"sv, "naughty"sv, "royal"sv, "ticket"sv,
"anxious"sv, "curious"sv, "harm"sv, "neck"sv, "run"sv, "title"sv,
"aromatic"sv, "curtain"sv, "heavy"sv, "night"sv, "satisfy"sv, "torpid"sv,
"attempt"sv, "cycle"sv, "helpless"sv, "nondescript"sv, "scary"sv, "train"sv,
"babies"sv, "deadpan"sv, "high-pitched"sv, "overjoyed"sv, "scatter"sv, "umbrella"sv,
"bake"sv, "decisive"sv, "hilarious"sv, "page"sv, "scene"sv, "unadvised"sv,
"ball"sv, "deeply"sv, "history"sv, "partner"sv, "scintillating"sv, "unbecoming"sv,
"bat"sv, "delightful"sv, "hook"sv, "party"sv, "self"sv, "unbiased"sv,
"behave"sv, "deserted"sv, "ignore"sv, "pause"sv, "selfish"sv, "unite"sv,
"best"sv, "draconian"sv, "imperfect"sv, "pear"sv, "silky"sv, "uptight"sv,
"birds"sv, "dreary"sv, "impossible"sv, "picture"sv, "sisters"sv, "used"sv,
"blind"sv, "dull"sv, "incandescent"sv, "place"sv, "ski"sv, "vengeful"sv,
"blood"sv, "enthusiastic"sv, "influence"sv, "playground"sv, "skip"sv, "versed"sv,
"blue-eyed"sv, "equable"sv, "innocent"sv, "popcorn"sv, "snow"sv, "vessel"sv,
"boiling"sv, "excuse"sv, "insidious"sv, "prefer"sv, "soap"sv, "view"sv,
"bore"sv, "experience"sv, "itch"sv, "productive"sv, "spare"sv, "voyage"sv,
"borrow"sv, "fabulous"sv, "jail"sv, "profuse"sv, "spicy"sv, "wall"sv,
"broken"sv, "familiar"sv, "kindhearted"sv, "protective"sv, "spiritual"sv, "want"sv,
"capable"sv, "finger"sv, "lackadaisical"sv, "pumped"sv, "sprout"sv, "weary"sv,
"charming"sv, "finicky"sv, "laughable"sv, "rabbit"sv, "squirrel"sv, "week"sv,
"cheerful"sv, "fix"sv, "leather"sv, "rapid"sv, "stale"sv, "whip"sv,
"chubby"sv, "flagrant"sv, "legal"sv, "regret"sv, "step"sv, "wilderness"sv,
"clean"sv, "flat"sv, "lewd"sv, "reject"sv, "stingy"sv, "wistful"sv,
"close"sv, "flimsy"sv, "license"sv, "rejoice"sv, "string"sv, "worried"sv,
"cobweb"sv, "fuel"sv, "light"sv, "relation"sv, "sulky"sv, "wretched"sv,
"complex"sv, "furtive"sv, "march"sv, "remarkable"sv, "surprise"sv, "zealous"sv,
"consist"sv, "geese"sv
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};
template <typename T>
[[nodiscard]] static T rand(T excl_max) noexcept
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{
return static_cast<T>(static_cast<T>(std::rand()) % excl_max);
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}
template <typename T>
[[nodiscard]] static T rand(T incl_min, T excl_max) noexcept
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{
return static_cast<T>(incl_min + rand(excl_max - incl_min));
}
static auto rand_date() noexcept
{
return toml::date{ rand(uint16_t{ 1900 }, uint16_t{ 2021 }),
rand(uint8_t{ 1 }, uint8_t{ 13 }),
rand(uint8_t{ 1 }, uint8_t{ 29 }) };
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}
static auto rand_time() noexcept
{
return toml::time{ rand(uint8_t{ 24 }),
rand(uint8_t{ 60 }),
rand(uint8_t{ 60 }),
rand(100) > 80 ? rand(1000000000u) : 0u };
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}
static auto rand_string(size_t word_count, char sep = ' ') noexcept
{
std::string val;
while (word_count-- > 0u)
{
if (!val.empty())
val += sep;
val.append(words[rand(words.size())]);
}
return val;
}
}
int main(int argc, char** argv)
{
examples::init();
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int node_budget{};
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for (int i = 1; i < argc; i++)
{
std::stringstream ss{ argv[i] };
int nodes;
if ((ss >> nodes))
node_budget += nodes;
}
if (node_budget <= 0)
node_budget = 100;
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toml::table root;
std::vector<toml::node*> tree;
tree.push_back(&root);
constexpr size_t max_depth = 10u;
int container_min_values = 10;
bool in_arr = false;
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const auto add = [&](auto&& val) noexcept -> auto&
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{
using value_ref = decltype(val);
using value_type = std::remove_reference_t<value_ref>;
using node_type = toml::inserted_type_of<value_type>;
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toml::node* new_node{};
// we're adding an element to an array
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if (auto arr = tree.back()->as_array())
{
arr->push_back(std::forward<value_ref>(val));
new_node = &arr->back();
}
// we're adding a new kvp to a table
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else
{
auto& table = tree.back()->ref<toml::table>();
const auto it =
table.insert_or_assign(rand_string(rand<size_t>(1u, 4u), '-'), std::forward<value_ref>(val));
new_node = &it.first->second;
}
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// we added a new array or table, so now we need to step into it
if constexpr (toml::is_container<value_type>)
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{
tree.push_back(new_node);
container_min_values = rand(1, 4);
in_arr = toml::is_array<value_type>;
if constexpr (toml::is_array<value_type>)
tree.back()->as_array()->reserve(static_cast<size_t>(container_min_values));
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}
else
container_min_values--;
node_budget--;
return *new_node->as<node_type>();
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};
while (node_budget)
{
if (!in_arr && rand(100) >= 75)
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{
if (container_min_values <= 0 && tree.size() < max_depth)
add(toml::table{}).is_inline(tree.size() >= max_depth - 2u && rand(100) >= 85);
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}
else
{
toml::node_type new_node_type;
if (auto arr = tree.back()->as_array(); arr && !arr->empty())
new_node_type = arr->front().type();
else
new_node_type = static_cast<toml::node_type>((rand() % 8) + 2);
switch (new_node_type)
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{
case toml::node_type::array:
if (container_min_values <= 0 && tree.size() < max_depth)
add(toml::array{});
break;
case toml::node_type::string: add(rand_string(rand<size_t>(8u))); break;
case toml::node_type::integer: add(rand()); break;
case toml::node_type::floating_point: add(rand(10001u) / 10000.0); break;
case toml::node_type::boolean: add(!rand(2u)); break;
case toml::node_type::date: add(rand_date()); break;
case toml::node_type::time: add(rand_time()); break;
case toml::node_type::date_time:
add(rand(100) >= 75
? toml::date_time{ rand_date(), rand_time() }
: toml::date_time{ rand_date(),
rand_time(),
toml::time_offset{ rand<int8_t>(-11, 12), rand<int8_t>(-45, +46) } });
break;
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}
if (container_min_values <= 0 && tree.size() >= 2u && rand(100) >= 85)
{
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tree.pop_back();
in_arr = !tree.empty() && tree.back()->type() == toml::node_type::array;
}
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}
}
std::cout << root << "\n";
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return 0;
}