lix/src/libutil/error.hh

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#pragma once
#include "types.hh"
#include <string>
#include <optional>
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#include <iostream>
using std::string;
using std::optional;
namespace nix {
enum ErrLevel
{ elWarning
, elError
};
class ColumnRange {
public:
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unsigned int start;
unsigned int len;
};
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class ErrorInfo;
class ErrLine {
public:
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int lineNumber;
optional<ColumnRange> columnRange;
optional<string> prevLineOfCode;
string errLineOfCode;
optional<string> nextLineOfCode;
};
class NixCode {
public:
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optional<string> nixFile;
optional<ErrLine> errLine;
ErrLine& ensureErrLine()
{
if (!this->errLine.has_value())
this->errLine = optional(ErrLine());
return *this->errLine;
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}
};
// -------------------------------------------------
// ErrorInfo.
// Forward friend class declarations. "builder classes"
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template <class T>
class AddName;
template <class T>
class AddDescription;
template <class T>
class AddNixCode;
template <class T>
class AddNixFile;
template <class T>
class AddErrLine;
template <class T>
class AddLineNumber;
template <class T>
class AddColumnRange;
template <class T>
class AddLOC;
// The error info class itself.
class ErrorInfo {
public:
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ErrLevel level;
string name;
string description;
string program;
optional<NixCode> nixCode;
string hint;
ErrorInfo& GetEI() { return *this; }
// give these access to the private constructor,
// when they are direct descendants.
friend AddName<ErrorInfo>;
friend AddDescription<ErrorInfo>;
friend AddNixCode<ErrorInfo>;
friend AddNixFile<ErrorInfo>;
friend AddErrLine<ErrorInfo>;
friend AddLineNumber<ErrorInfo>;
friend AddColumnRange<ErrorInfo>;
friend AddLOC<ErrorInfo>;
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NixCode& ensureNixCode()
{
if (!this->nixCode.has_value())
this->nixCode = optional(NixCode());
return *this->nixCode;
}
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protected:
// constructor is protected, so only the builder classes can create an ErrorInfo.
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ErrorInfo(ErrLevel level) { this->level = level; }
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};
class EIError : public ErrorInfo
{
protected:
EIError() : ErrorInfo(elError) {}
};
class EIWarning : public ErrorInfo
{
protected:
EIWarning() : ErrorInfo(elWarning) {}
};
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template <class T>
class AddName : private T
{
public:
T& name(const std::string &name){
GetEI().name = name;
return *this;
}
protected:
ErrorInfo& GetEI() { return T::GetEI(); }
};
template <class T>
class AddDescription : private T
{
public:
T& description(const std::string &description){
GetEI().description = description;
return *this;
}
protected:
ErrorInfo& GetEI() { return T::GetEI(); }
};
template <class T>
class AddNixFile : public T
{
public:
T& nixFile(string filename) {
GetEI().ensureNixCode().nixFile = filename;
return *this;
}
protected:
ErrorInfo& GetEI() { return T::GetEI(); }
};
template <class T>
class AddLineNumber : public T
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{
public:
T& lineNumber(int lineNumber) {
GetEI().ensureNixCode().ensureErrLine().lineNumber = lineNumber;
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return *this;
}
protected:
ErrorInfo& GetEI() { return T::GetEI(); }
};
template <class T>
class AddColumnRange : public T
{
public:
T& columnRange(unsigned int start, unsigned int len) {
GetEI().ensureNixCode().ensureErrLine().columnRange = { start, len };
return *this;
}
protected:
ErrorInfo& GetEI() { return T::GetEI(); }
};
template <class T>
class AddLOC : public T
{
public:
T& linesOfCode(optional<string> prevloc, string loc, optional<string> nextloc) {
GetEI().ensureNixCode().ensureErrLine().prevLineOfCode = prevloc;
GetEI().ensureNixCode().ensureErrLine().errLineOfCode = loc;
GetEI().ensureNixCode().ensureErrLine().nextLineOfCode = nextloc;
return *this;
}
protected:
ErrorInfo& GetEI() { return T::GetEI(); }
};
typedef AddNixFile<AddErrLine<NixCode>> MkNixCode;
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typedef AddName<AddDescription<EIError>> StandardError;
typedef AddName<AddDescription<EIWarning>> StandardWarning;
typedef AddName<
AddDescription<
AddNixFile<
AddLineNumber<
AddColumnRange<
AddLOC<EIError>>>>>> MkNixError;
typedef AddName<
AddDescription<
AddNixFile<
AddLineNumber<
AddColumnRange<
AddLOC<EIWarning>>>>>> MkNixWarning;
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string showErrLine(ErrLine &errLine);
void print_code_lines(string &prefix, NixCode &nix_code);
void print_error(ErrorInfo &einfo);
}