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update toml_merger example

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This commit is contained in:
Mark Gillard 2022-06-16 01:27:32 +03:00
parent 6126437d6c
commit 6a47ce703d
1 changed files with 41 additions and 9 deletions
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50
examples/toml_merger.cpp
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@ -17,31 +17,63 @@ namespace
// note that this implementation always prioritizes 'rhs' over 'lhs' in the event of a conflict;
// extending it to handle conflicts in some other manner is left as an exercise to the reader :)
static void merge(toml::table& lhs, toml::table&& rhs)
static void merge_left(toml::table& lhs, toml::table&& rhs);
static void merge_left(toml::array& lhs, toml::array&& rhs)
{
rhs.for_each(
[&](std::size_t index, auto&& rhs_val)
{
// rhs index not found in lhs - direct move
if (lhs.size() <= index)
{
lhs.push_back(std::move(rhs_val));
return;
}
// both elements were the same container type - recurse into them
if constexpr (toml::is_container<decltype(rhs_val)>)
{
using rhs_type = std::remove_cv_t<std::remove_reference_t<decltype(rhs_val)>>;
if (auto lhs_child = lhs[index].as<rhs_type>())
{
merge_left(*lhs_child, std::move(rhs_val));
return;
}
}
// replace lhs element with rhs
lhs.replace(lhs.cbegin() + static_cast<std::ptrdiff_t>(index), std::move(rhs_val));
});
}
static void merge_left(toml::table& lhs, toml::table&& rhs)
{
rhs.for_each(
[&](const toml::key& rhs_key, auto&& rhs_val)
{
auto lhs_it = lhs.lower_bound(rhs_key);
// not found in lhs - direct move
// rhs key not found in lhs - direct move
if (lhs_it == lhs.cend() || lhs_it->first != rhs_key)
{
lhs.emplace_hint(lhs_it, rhs_key, std::move(rhs_val));
using rhs_type = std::remove_cv_t<std::remove_reference_t<decltype(rhs_val)>>;
lhs.emplace_hint<rhs_type>(lhs_it, rhs_key, std::move(rhs_val));
return;
}
// both nodes were tables - recurse into them
if constexpr (toml::is_table<decltype(rhs_val)>)
// both children were the same container type - recurse into them
if constexpr (toml::is_container<decltype(rhs_val)>)
{
if (auto lhs_child_table = lhs_it->second.as_table())
using rhs_type = std::remove_cv_t<std::remove_reference_t<decltype(rhs_val)>>;
if (auto lhs_child = lhs_it->second.as<rhs_type>())
{
merge(*lhs_child_table, std::move(rhs_val));
merge_left(*lhs_child, std::move(rhs_val));
return;
}
}
// one or both weren't tables - replace lhs with rhs
// replace lhs value with rhs
lhs.insert_or_assign(rhs_key, std::move(rhs_val));
});
}
@ -56,7 +88,7 @@ int main(int argc, char** argv)
try
{
tbl = toml::parse_file(base_path);
merge(tbl, toml::parse_file(overrides_path));
merge_left(tbl, toml::parse_file(overrides_path));
}
catch (const toml::parse_error& err)
{