lix/src/libutil/error.hh

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#ifndef error_hh
#define error_hh
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#include "ansicolor.hh"
#include <string>
#include <optional>
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#include <iostream>
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#include <iomanip>
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#include "types.hh"
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namespace nix
{
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typedef enum {
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elWarning,
elError
} ErrLevel;
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class ErrPos
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{
public:
int lineNumber;
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int column;
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string nixFile;
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template <class P>
ErrPos& operator=(const P &pos)
{
lineNumber = pos.line;
column = pos.column;
nixFile = pos.file.str();
return *this;
}
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};
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// ----------------------------------------------------------------
// format for hints. same as fmt, except templated values
// are always in yellow.
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template <class T>
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class yellowify
{
public:
yellowify(T &s) : value(s) {}
T &value;
};
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template <class T>
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std::ostream& operator<<(std::ostream &out, const yellowify<T> &y)
{
return out << ANSI_YELLOW << y.value << ANSI_NORMAL;
}
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class hintformat
{
public:
hintformat(string format) :fmt(format)
{
fmt.exceptions(boost::io::all_error_bits ^ boost::io::too_many_args_bit);
}
template<class T>
hintformat& operator%(const T &value)
{
fmt % yellowify(value);
return *this;
}
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std::string str() const
{
return fmt.str();
}
template <typename U>
friend class AddHint;
private:
format fmt;
};
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std::ostream& operator<<(std::ostream &os, const hintformat &hf)
{
return os << hf.str();
}
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template<typename... Args>
inline hintformat hintfmt(const std::string & fs, const Args & ... args)
{
hintformat f(fs);
formatHelper(f, args...);
return f;
}
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// -------------------------------------------------
// ErrorInfo.
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class ErrorInfo
{
public:
ErrLevel level;
string name;
string description;
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std::optional<hintformat> hint;
std::optional<string> prevLineOfCode;
string errLineOfCode;
std::optional<string> nextLineOfCode;
std::optional<ErrPos> errPos;
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static std::optional<string> programName;
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private:
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// template <class P>
// static ErrorInfo NixLangEI(ErrLevel level,
// const string &name,
// const string &description,
// const P &pos,
// std::optional<string> prevloc,
// string loc,
// std::optional<string> nextloc,
// const std::optional<hintformat> &hf)
// {
// ErrorInfo ei(level);
// ei.name = name;
// ei.description = description;
// if (hf.has_value())
// ei.hint = std::optional<string>(hf->str());
// else
// ei.hint = std::nullopt;
// ErrLine errline;
// errline.lineNumber = pos.line;
// errline.column = pos.column;
// errline.prevLineOfCode = prevloc;
// errline.errLineOfCode = loc;
// errline.nextLineOfCode = nextloc;
// NixCode nixcode;
// nixcode.nixFile = pos.file;
// nixcode.errLine = std::optional(errline);
// ei.nixCode = std::optional(nixcode);
// return ei;
// }
// static ErrorInfo ProgramEI(ErrLevel level,
// const string &name,
// const string &description,
// const std::optional<hintformat> &hf);
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// constructor is protected, so only the builder classes can create an ErrorInfo.
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};
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// --------------------------------------------------------
// error printing
// just to cout for now.
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void printErrorInfo(const ErrorInfo &einfo);
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}
#endif