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#include "register_manager.hh"
#include "utils.hh"
#include "assert.hh"
namespace Kakoune
{
// static value register, which can be modified
// using operator=, so should be user modifiable
class StaticRegister : public Register
{
public:
Register& operator=(const memoryview<String>& values) override
{
m_content = std::vector<String>(values.begin(), values.end());
return *this;
}
memoryview<String> values(const Context&) override
{
if (m_content.empty())
return memoryview<String>(ms_empty);
else
return memoryview<String>(m_content);
}
protected:
std::vector<String> m_content;
static const String ms_empty;
};
const String StaticRegister::ms_empty;
// Dynamic value register, use it's RegisterRetriever
// to get it's value when needed.
class DynamicRegister : public StaticRegister
{
public:
DynamicRegister(RegisterRetriever function)
: m_function(std::move(function)) {}
Register& operator=(const memoryview<String>& values) override
{
throw runtime_error("this register is not assignable");
}
memoryview<String> values(const Context& context) override
{
m_content = m_function(context);
return StaticRegister::values(context);
}
private:
RegisterRetriever m_function;
};
Register& RegisterManager::operator[](char reg)
{
auto& reg_ptr = m_registers[reg];
if (not reg_ptr)
reg_ptr.reset(new StaticRegister());
return *reg_ptr;
}
void RegisterManager::register_dynamic_register(char reg, RegisterRetriever function)
{
auto& reg_ptr = m_registers[reg];
assert(not reg_ptr);
reg_ptr.reset(new DynamicRegister(std::move(function)));
}
}
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