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#pragma once
#include "ref.hh"
#include "types.hh"
#include <list>
#include <memory>
#include <map>
#include <optional>
#include "fmt.hh"
/* Before 4.7, gcc's std::exception uses empty throw() specifiers for
* its (virtual) destructor and what() in c++11 mode, in violation of spec
*/
#ifdef __GNUC__
#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
#define EXCEPTION_NEEDS_THROW_SPEC
#endif
#endif
namespace nix {
typedef enum {
lvlError = 0,
lvlWarn,
lvlInfo,
lvlTalkative,
lvlChatty,
lvlDebug,
lvlVomit
} Verbosity;
struct ErrPos {
int line = 0;
int column = 0;
string file;
operator bool() const
{
return line != 0;
}
template <class P>
ErrPos& operator=(const P &pos)
{
line = pos.line;
column = pos.column;
file = pos.file;
return *this;
}
template <class P>
ErrPos(const P &p)
{
*this = p;
}
};
struct NixCode {
ErrPos errPos;
std::optional<string> prevLineOfCode;
std::optional<string> errLineOfCode;
std::optional<string> nextLineOfCode;
};
// -------------------------------------------------
// ErrorInfo.
struct ErrorInfo {
Verbosity level;
string name;
string description;
std::optional<hintformat> hint;
std::optional<NixCode> nixCode;
static std::optional<string> programName;
};
std::ostream& operator<<(std::ostream &out, const ErrorInfo &einfo);
/* BaseError should generally not be caught, as it has Interrupted as
a subclass. Catch Error instead. */
class BaseError : public std::exception
{
protected:
string prefix_; // used for location traces etc.
mutable ErrorInfo err;
mutable std::optional<string> what_;
const string& calcWhat() const;
public:
unsigned int status = 1; // exit status
template<typename... Args>
BaseError(unsigned int status, const Args & ... args)
: err { .level = lvlError,
.hint = hintfmt(args...)
}
, status(status)
{ }
template<typename... Args>
BaseError(const Args & ... args)
: err { .level = lvlError,
.hint = hintfmt(args...)
}
{ }
BaseError(hintformat hint)
: err { .level = lvlError,
.hint = hint
}
{ }
BaseError(ErrorInfo e)
: err(e)
{ }
virtual const char* sname() const { return "BaseError"; }
#ifdef EXCEPTION_NEEDS_THROW_SPEC
~BaseError() throw () { };
const char * what() const throw () { return calcWhat().c_str(); }
#else
const char * what() const noexcept override { return calcWhat().c_str(); }
#endif
const string & msg() const { return calcWhat(); }
const string & prefix() const { return prefix_; }
BaseError & addPrefix(const FormatOrString & fs);
const ErrorInfo & info() { calcWhat(); return err; }
};
#define MakeError(newClass, superClass) \
class newClass : public superClass \
{ \
public: \
using superClass::superClass; \
virtual const char* sname() const override { return #newClass; } \
}
MakeError(Error, BaseError);
class SysError : public Error
{
public:
int errNo;
template<typename... Args>
SysError(const Args & ... args)
:Error("")
{
errNo = errno;
auto hf = hintfmt(args...);
err.hint = hintfmt("%1%: %2%", normaltxt(hf.str()), strerror(errNo));
}
virtual const char* sname() const override { return "SysError"; }
};
}
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