lix/src/libutil/types.hh

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#pragma once
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#include "ref.hh"
#include <list>
#include <set>
#include <memory>
#include <map>
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#include <optional>
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#include "fmt.hh"
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/* 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 {
using std::list;
using std::set;
using std::vector;
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typedef enum {
lvlError = 0,
lvlWarn,
lvlInfo,
lvlTalkative,
lvlChatty,
lvlDebug,
lvlVomit
} Verbosity;
struct ErrPos
{
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int line;
int column;
string file;
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template <class P>
ErrPos& operator=(const P &pos)
{
line = pos.line;
column = pos.column;
file = pos.file;
return *this;
}
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template <class P>
ErrPos(const P &p)
{
*this = p;
}
};
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struct NixCode
{
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ErrPos errPos;
std::optional<string> prevLineOfCode;
string errLineOfCode;
std::optional<string> nextLineOfCode;
};
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// -------------------------------------------------
// ErrorInfo.
struct ErrorInfo
{
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Verbosity level;
string name;
string description;
std::optional<hintformat> hint;
std::optional<NixCode> nixCode;
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static std::optional<string> programName;
};
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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.
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ErrorInfo err;
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string what_;
void initWhat()
{
std::ostringstream oss;
oss << err;
what_ = oss.str();
}
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)
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{ initWhat(); }
template<typename... Args>
BaseError(const Args & ... args)
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: err { .level = lvlError,
.hint = hintfmt(args...)
}
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{ initWhat(); }
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BaseError(ErrorInfo e)
: err(e)
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{ initWhat(); }
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#ifdef EXCEPTION_NEEDS_THROW_SPEC
~BaseError() throw () { };
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const char * what() const throw () { return what_.c_str(); }
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#else
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const char * what() const noexcept { return what_.c_str(); }
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#endif
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const string & msg() const { return what_; }
const string & prefix() const { return prefix_; }
BaseError & addPrefix(const FormatOrString & fs);
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const ErrorInfo & info() const { return err; }
};
#define MakeError(newClass, superClass) \
class newClass : public superClass \
{ \
public: \
using superClass::superClass; \
}
MakeError(Error, BaseError);
class SysError : public Error
{
public:
int errNo;
template<typename... Args>
SysError(const Args & ... args)
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: Error(args...) // TODO addErrNo for hintfmt
// : Error(addErrno(hintfmt(args...)))
{ }
private:
std::string addErrno(const std::string & s);
};
typedef list<string> Strings;
typedef set<string> StringSet;
typedef std::map<std::string, std::string> StringMap;
/* Paths are just strings. */
typedef string Path;
typedef list<Path> Paths;
typedef set<Path> PathSet;
}