forked from lix-project/lix
158 lines
3.2 KiB
C++
158 lines
3.2 KiB
C++
#pragma once
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#include "ref.hh"
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#include <list>
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#include <memory>
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#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
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* its (virtual) destructor and what() in c++11 mode, in violation of spec
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*/
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#ifdef __GNUC__
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#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
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#define EXCEPTION_NEEDS_THROW_SPEC
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#endif
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#endif
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namespace nix {
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using std::list;
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using std::vector;
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typedef enum {
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lvlError = 0,
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lvlWarn,
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lvlInfo,
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lvlTalkative,
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lvlChatty,
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lvlDebug,
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lvlVomit
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} Verbosity;
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struct ErrPos
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{
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int line;
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int column;
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string file;
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template <class P>
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ErrPos& operator=(const P &pos)
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{
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line = pos.line;
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column = pos.column;
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file = pos.file;
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return *this;
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}
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template <class P>
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ErrPos(const P &p)
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{
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*this = p;
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}
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};
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struct NixCode
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{
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ErrPos errPos;
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std::optional<string> prevLineOfCode;
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string errLineOfCode;
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std::optional<string> nextLineOfCode;
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};
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// -------------------------------------------------
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// ErrorInfo.
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struct ErrorInfo
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{
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Verbosity level;
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string name;
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string description;
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std::optional<hintformat> hint;
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std::optional<NixCode> nixCode;
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static std::optional<string> programName;
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};
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std::ostream& operator<<(std::ostream &out, const ErrorInfo &einfo);
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/* BaseError should generally not be caught, as it has Interrupted as
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a subclass. Catch Error instead. */
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class BaseError : public std::exception
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{
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protected:
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string prefix_; // used for location traces etc.
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ErrorInfo err;
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string what_;
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void initWhat()
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{
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std::ostringstream oss;
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oss << err;
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what_ = oss.str();
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}
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public:
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unsigned int status = 1; // exit status
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template<typename... Args>
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BaseError(unsigned int status, const Args & ... args)
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: err { .level = lvlError,
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.hint = hintfmt(args...)
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}
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, status(status)
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{ initWhat(); }
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template<typename... Args>
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BaseError(const Args & ... args)
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: err { .level = lvlError,
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.hint = hintfmt(args...)
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}
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{ initWhat(); }
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BaseError(ErrorInfo e)
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: err(e)
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{ initWhat(); }
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#ifdef EXCEPTION_NEEDS_THROW_SPEC
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~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_; }
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const string & prefix() const { return prefix_; }
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BaseError & addPrefix(const FormatOrString & fs);
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const ErrorInfo & info() const { return err; }
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};
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#define MakeError(newClass, superClass) \
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class newClass : public superClass \
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{ \
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public: \
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using superClass::superClass; \
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}
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MakeError(Error, BaseError);
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class SysError : public Error
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{
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public:
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int errNo;
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template<typename... Args>
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SysError(const Args & ... args)
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: Error(args...) // TODO addErrNo for hintfmt
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// : Error(addErrno(hintfmt(args...)))
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{ }
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private:
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std::string addErrno(const std::string & s);
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};
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}
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