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refactor: check (always-valid) ptr before deref

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ToruNiina
2020-07-27 21:32:35 +09:00
parent e696aabd11
commit ce68f6f4c2
1 changed files with 22 additions and 13 deletions
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35
toml/parser.hpp
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@@ -1161,7 +1161,12 @@ template<typename Value, typename Iterator>
bool is_valid_forward_table_definition(const Value& fwd,
Iterator key_first, Iterator key_curr, Iterator key_last)
{
location def("internal", detail::get_region(fwd)->str());
std::string internal = "";
if(const auto ptr = detail::get_region(fwd))
{
internal = ptr->str();
}
location def("internal", std::move(internal));
if(const auto tabkeys = parse_table_key(def))
{
// table keys always contains all the nodes from the root.
@@ -1283,18 +1288,21 @@ insert_nested_key(typename Value::table_type& root, const Value& v,
// that points to the key of the table (e.g. [[a]]). By
// comparing the first two letters in key, we can detect
// the array-of-table is inline or multiline.
if(detail::get_region(a.front())->str().substr(0,2) != "[[")
if(const auto ptr = detail::get_region(a.front()))
{
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: array of table (\"",
format_dotted_keys(first, last), "\") collides with"
" existing array-of-tables"), {
{get_region(tab->at(k)),
concat_to_string("this ", tab->at(k).type(),
" value has static size")},
{get_region(v),
"appending it to the statically sized array"}
}), v.location());
if(ptr->str().substr(0,2) != "[[")
{
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: array of table (\"",
format_dotted_keys(first, last), "\") collides "
"with existing array-of-tables"), {
{get_region(tab->at(k)),
concat_to_string("this ", tab->at(k).type(),
" value has static size")},
{get_region(v),
"appending it to the statically sized array"}
}), v.location());
}
}
a.push_back(v);
return ok(true);
@@ -1379,10 +1387,11 @@ insert_nested_key(typename Value::table_type& root, const Value& v,
// According to toml-lang/toml:36d3091b3 "Clarify that inline
// tables are immutable", check if it adds key-value pair to an
// inline table.
if(const auto* ptr = get_region(tab->at(k)))
{
// here, if the value is a (multi-line) table, the region
// should be something like `[table-name]`.
if(get_region(tab->at(k))->front() == '{')
if(ptr->front() == '{')
{
throw syntax_error(format_underline(concat_to_string(
"toml::insert_value: inserting to an inline table (",