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#pragma once
#include "last_getopt_opts.h"
#include "last_getopt_parser.h"
namespace NLastGetopt {
/**
* NLastGetopt::TOptParseResult contains all arguments for exactly one TOpt,
* that have been fetched during parsing
*
* The class is a wraper over a vector of nil-terminated strings.
*/
class TOptParseResult {
public:
typedef TVector<const char*> TValues;
public:
TOptParseResult(const TOpt* opt = nullptr)
: Opt_(opt)
{
}
public:
const TOpt& Opt() const {
return *Opt_;
}
const TOpt* OptPtr() const {
return Opt_;
}
const TValues& Values() const {
return Values_;
}
bool Empty() const {
return Values().empty();
}
size_t Count() const {
return Values_.size();
}
void AddValue(const char* val) {
if (nullptr != val)
Values_.push_back(val);
}
const char* DefVal(const char* def = nullptr) const {
return Opt().HasDefaultValue() ? Opt().GetDefaultValue().c_str() : def;
}
const char* Front(const char* def = nullptr) const {
return Empty() ? DefVal(def) : Values().front();
}
const char* Back(const char* def = nullptr) const {
return Empty() ? DefVal(def) : Values().back();
}
private:
const TOpt* Opt_;
TValues Values_;
};
/**
* NLastGetopt::TOptsParseResult contains result of parsing argc,argv be parser.
*
* In most common case constructed by argc,argv pair and rules (TOpts).
* The instance being constructed validates rules and performs parsing, stores result for futher access.
*
* If error during parsing occures, the program aborts with exit code 1.
* Note, that if PERMUTE mode is on, then data, pointed by argv can be changed.
*/
class TOptsParseResult {
private:
THolder<TOptsParser> Parser_; //The instance of parser.
// XXX: make argc, argv
typedef TVector<TOptParseResult> TdVec;
TdVec Opts_; //Parsing result for all options, that have been explicitly defined in argc/argv
TdVec OptsDef_; //Parsing result for options, that have been defined by default values only
private:
TOptParseResult& OptParseResult();
/**
* Searchs for object in given container
*
* @param vec container
* @param opt ptr for required object
*
* @retunr ptr on corresponding TOptParseResult
*/
static const TOptParseResult* FindParseResult(const TdVec& vec, const TOpt* opt);
protected:
/**
* Performs parsing of comand line arguments.
*/
void Init(const TOpts* options, int argc, const char** argv);
TOptsParseResult() = default;
public:
/**
* The action in case of parser failure.
* Allows to asjust behavior in derived classes.
* By default prints error string and aborts the program
*/
virtual void HandleError() const;
/**
* Constructs object by parsing arguments with given rules
*
* @param options ptr on parsing rules
* @param argc
* @param argv
*/
TOptsParseResult(const TOpts* options, int argc, const char* argv[]) {
Init(options, argc, argv);
}
/**
* Constructs object by parsing arguments with given rules
*
* @param options ptr on parsing rules
* @param argc
* @param argv
*/
TOptsParseResult(const TOpts* options, int argc, char* argv[]) {
Init(options, argc, const_cast<const char**>(argv));
}
virtual ~TOptsParseResult() = default;
/**
* Search for TOptParseResult that corresponds to given option (TOpt)
*
* @param opt ptr on required object
* @param includeDefault search in results obtained from default values
*
* @return ptr on result
*/
const TOptParseResult* FindOptParseResult(const TOpt* opt, bool includeDefault = false) const;
/**
* Search for TOptParseResult that corresponds to given long name
*
* @param name long name of required object
* @param includeDefault search in results obtained from default values
*
* @return ptr on result
*/
const TOptParseResult* FindLongOptParseResult(const TString& name, bool includeDefault = false) const;
/**
* Search for TOptParseResult that corresponds to given short name
*
* @param c short name of required object
* @param includeDefault search in results obtained from default values
*
* @return ptr on result
*/
const TOptParseResult* FindCharOptParseResult(char c, bool includeDefault = false) const;
/**
* @return argv[0]
*/
TString GetProgramName() const;
/**
* Print usage string.
*/
void PrintUsage(IOutputStream& os = Cout) const;
/**
* @return position in [premuted argv] of the first free argument
*/
size_t GetFreeArgsPos() const;
/**
* @return number of fetched free arguments
*/
size_t GetFreeArgCount() const;
/**
* @return all fetched free arguments
*/
TVector<TString> GetFreeArgs() const;
/**
* @return true if given option exist in results of parsing
*
* @param opt ptr on required object
* @param includeDefault search in results obtained from default values
*
*/
bool Has(const TOpt* opt, bool includeDefault = false) const;
/**
* @return nil terminated string on the last fetched argument of givne option
*
* @param opt ptr on required object
* @param includeDefault search in results obtained from default values
*/
const char* Get(const TOpt* opt, bool includeDefault = true) const;
/**
* @return nil terminated string on the last fetched argument of givne option
* if option haven't been fetched, given defaultValue will be returned
*
* @param opt ptr on required object
* @param defaultValue
*/
const char* GetOrElse(const TOpt* opt, const char* defaultValue) const;
/**
* @return true if given option exist in results of parsing
*
* @param name long name of required object
* @param includeDefault search in results obtained from default values
*
*/
bool Has(const TString& name, bool includeDefault = false) const;
/**
* @return nil terminated string on the last fetched argument of givne option
*
* @param name long name of required object
* @param includeDefault search in results obtained from default values
*/
const char* Get(const TString& name, bool includeDefault = true) const;
/**
* @return nil terminated string on the last fetched argument of givne option
* if option haven't been fetched, given defaultValue will be returned
*
* @param name long name of required object
* @param defaultValue
*/
const char* GetOrElse(const TString& name, const char* defaultValue) const;
/**
* @return true if given option exist in results of parsing
*
* @param c short name of required object
* @param includeDefault search in results obtained from default values
*
*/
bool Has(char name, bool includeDefault = false) const;
/**
* @return nil terminated string on the last fetched argument of givne option
*
* @param c short name of required object
* @param includeDefault search in results obtained from default values
*/
const char* Get(char name, bool includeDefault = true) const;
/**
* @return nil terminated string on the last fetched argument of givne option
* if option haven't been fetched, given defaultValue will be returned
*
* @param c short name of required object
* @param defaultValue
*/
const char* GetOrElse(char name, const char* defaultValue) const;
/**
* for givne option return parsed value of the last fetched argument
* if option haven't been fetched, HandleError action is called
*
* @param opt required option (one of: ptr, short name, long name).
*
* @return FromString<T>(last feteched argument)
*/
template <typename T, typename TKey>
T Get(const TKey opt) const {
const char* value = Get(opt);
try {
return NPrivate::OptFromString<T>(value, opt);
} catch (...) {
HandleError();
throw;
}
}
/**
* for givne option return parsed value of the last fetched argument
* if option haven't been fetched, given defaultValue will be returned
*
* @param opt required option (one of: ptr, short name, long name).
* @param defaultValue
*
* @return FromString<T>(last feteched argument)
*/
template <typename T, typename TKey>
T GetOrElse(const TKey opt, const T& defaultValue) const {
if (Has(opt))
return Get<T>(opt);
else
return defaultValue;
}
};
/**
* NLastGetopt::TOptsParseResultException contains result of parsing argc,argv be parser.
*
* Unlike TOptsParseResult, if error during parsing occures, an exception is thrown.
*
*/
class TOptsParseResultException: public TOptsParseResult {
public:
TOptsParseResultException(const TOpts* options, int argc, const char* argv[]) {
Init(options, argc, argv);
}
TOptsParseResultException(const TOpts* options, int argc, char* argv[]) {
Init(options, argc, const_cast<const char**>(argv));
}
virtual ~TOptsParseResultException() = default;
void HandleError() const override;
protected:
TOptsParseResultException() = default;
};
}
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