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DOM: Create a copy of Task object only if needed

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Tomas Babej 2021-04-24 01:51:06 -04:00
parent 87b0be9b6f
commit 95b135b59e
1 changed files with 44 additions and 24 deletions
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68
src/DOM.cpp
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@ -260,36 +260,56 @@ bool getDOM (const std::string& name, const Task& task, Variant& value)
// split name on '.'
auto elements = split (name, '.');
Task loaded_task;
Task ref (task);
Lexer lexer (elements[0]);
std::string token;
Lexer::Type type;
// If this can be ID/UUID reference (the name contains '.'),
// lex it to figure out. Otherwise don't lex, as lexing can be slow.
if ((elements.size() > 1) and lexer.token (token, type))
// Use a lambda to decide whether the reference is going to be the passed
// "task" or whether it's going to be a newly loaded task (if id/uuid was
// given).
const Task& ref = [&]() -> const Task&
{
if (type == Lexer::Type::uuid &&
token.length () == elements[0].length ())
{
if (token != ref.get ("uuid"))
Context::getContext ().tdb2.get (token, ref);
Lexer lexer (elements[0]);
std::string token;
Lexer::Type type;
// Eat elements[0]/UUID.
elements.erase (elements.begin ());
}
else if (type == Lexer::Type::number &&
token.find ('.') == std::string::npos)
// If this can be ID/UUID reference (the name contains '.'),
// lex it to figure out. Otherwise don't lex, as lexing can be slow.
if ((elements.size() > 1) and lexer.token (token, type))
{
auto id = strtol (token.c_str (), nullptr, 10);
if (id && id != ref.id)
Context::getContext ().tdb2.get (id, ref);
bool reloaded = false;
// Eat elements[0]/ID.
elements.erase (elements.begin ());
if (type == Lexer::Type::uuid &&
token.length () == elements[0].length ())
{
if (token != task.get ("uuid"))
{
Context::getContext ().tdb2.get (token, loaded_task);
reloaded = true;
}
// Eat elements[0]/UUID.
elements.erase (elements.begin ());
}
else if (type == Lexer::Type::number &&
token.find ('.') == std::string::npos)
{
auto id = strtol (token.c_str (), nullptr, 10);
if (id && id != task.id)
{
Context::getContext ().tdb2.get (id, loaded_task);
reloaded = true;
}
// Eat elements[0]/ID.
elements.erase (elements.begin ());
}
if (reloaded)
return loaded_task;
}
}
return task;
} ();
auto size = elements.size ();