Detailed Description

Handle reading columns of numeric data in text files.

Author: Eric Bonnet (ebonn.nosp@m.et@s.nosp@m.ubate.nosp@m.ch.i.nosp@m.n2p3..nosp@m.fr)

Date: Tue Jul 13 11:52:58 2010

This class can be used to read any text file containing numeric data in columns such as

1   19    3.56    2
2   29    3.66    1
3   39    3.26    -1

or

1,19,3.56,2
2,29,3.66,1
3,39,3.26,-1

i.e. columns of data separated by whitespace, commas, tabs, or any other separator character

Comment lines will be ignored if the signature for the beginning of a comment is given to the constructor, e.g.

KVFileReader data_file("#"); // comment lines begin with '#'
 
KVFileReader data_file2("//"); // comment lines begin with '//'

To open the file to be read, give the full path (shell characters & environment variables can be used) to method OpenFileToRead():

auto ok = data_file.OpenFileToRead("$SOME_ENV/my_file.dat");
if( ok )
{
   [file was opened successfully]
}

Each line of the file can then be read in using one of the following methods:

ReadLine(const KVString& pattern = "")
ReadLineAndAdd(const KVString& pattern = "")
ReadLineAndCheck(Int_t nexpect, const KVString& pattern)
ReuseLineAndCheck(Int_t nexpect, const KVString& pattern)

The values of the parameters which were read, if any, can then be retrieved using

KVString GetReadPar(int pos);
Int_t GetIntReadPar(int pos);
Double_t GetDoubleReadPar(int pos);

Assuming we are reading either of the files given above, the following examples illustrate usage:

KVFileReader p;
p.OpenFileToRead("data.txt");
 
while (p.IsOK()) {
   if (p.ReadLine(" \t,") == KVFileReader::ReadStatus::OK) {
      std::cout << p.GetDoubleReadPar(0) << " " << p.GetIntReadPar(1) << " " << p.GetDoubleReadPar(2) << " " << p.GetIntReadPar(3) << std::endl;
   }
}

will give the following output:

1 19 3.56 2
2 29 3.66 1
3 39 3.26 -1

If you want to check the right number of parameters is being read:

KVFileReader p;
p.OpenFileToRead("data.txt");
 
while (p.IsOK()) {
   if (p.ReadLineAndCheck(4," \t,") == KVFileReader::ReadStatus::OK) {
      std::cout << p.GetDoubleReadPar(0) << " " << p.GetIntReadPar(1) << " " << p.GetDoubleReadPar(2) << " " << p.GetIntReadPar(3) << std::endl;
   }
}

will give the following output:

1 19 3.56 2
2 29 3.66 1
3 39 3.26 -1

And finally if you want to cumulate several lines of parameters into a single list:

KVFileReader p;
p.OpenFileToRead("data.txt");
 
while (p.ReadLineAndAdd(" \t,") == KVFileReader::ReadStatus::OK) ;
 
for(int i=0; i<p.GetNparRead(); ++i){
   std::cout << i << ":" << p.GetReadPar(i) << " ";
   if(!((i+1)%4)) std::cout << std::endl;
}

will give the following output:

0.1 1:19 2:3.56 3:2
0.2 5:29 6:3.66 7:1
0.3 9:39 10:3.26 11:-1

Definition at line 120 of file KVFileReader.h.

#include <KVFileReader.h>

Inheritance diagram for KVFileReader:

[legend]

Public Types
enum class	ReadStatus { EmptyLine , OK , ParamMismatch , CommentLine , EndOfFile }
	status returned by each method used to read a line in the file More...

Public Types inherited from KVBase
enum	EKaliVedaBits { kIsKaliVedaObject = BIT(23) }

Public Types inherited from TObject
enum	EDeprecatedStatusBits

enum	EStatusBits

Public Member Functions
	KVFileReader (const KVString &comments="")

void	Clear (Option_t *="")

void	CloseFile ()

KVString	GetCurrentLine ()

Double_t	GetDoubleReadPar (Int_t pos) const

KVString	GetFileName ()

Int_t	GetIntReadPar (Int_t pos) const

Int_t	GetNlineRead () const

Int_t	GetNparRead () const

KVString	GetReadPar (Int_t pos) const

KVString	GetReadStatus (ReadStatus s)

Bool_t	IsOK ()

Bool_t	OpenFileToRead (const KVString &filename)

Bool_t	PreparForReadingAgain ()

ReadStatus	ReadLine (const KVString &pattern="")

ReadStatus	ReadLineAndAdd (const KVString &pattern="")

ReadStatus	ReadLineAndCheck (Int_t nexpect, const KVString &pattern)

ReadStatus	ReuseLineAndCheck (Int_t nexpect, const KVString &pattern)

Public Member Functions inherited from KVBase
	KVBase ()
	Default constructor.

	KVBase (const Char_t name, const Char_t title="")
	Ctor for object with given name and type.

	KVBase (const KVBase &)
	copy ctor

virtual	~KVBase ()

virtual void	Copy (TObject &) const
	Make a copy of this object.

const Char_t *	GetLabel () const

UInt_t	GetNumber () const

UInt_t	GetNumberOfObjects () const

virtual TObject *	GetObject () const

virtual const Char_t *	GetType () const

Bool_t	HasLabel () const

virtual Bool_t	IsCalled (const Char_t *name) const

Bool_t	IsLabelled (const Char_t *l) const

virtual Bool_t	IsType (const Char_t *typ) const

virtual void	List ()

KVBase &	operator= (const KVBase &)
	copy assignment operator

virtual void	Print (Option_t *option="") const

Double_t	ProtectedGetX (const TF1 *func, Double_t val, int &status, Double_t xmin=0.0, Double_t xmax=0.0) const

void	SetLabel (const Char_t *lab)

virtual void	SetNumber (UInt_t num)

virtual void	SetType (const Char_t *str)

Public Member Functions inherited from TNamed
	TNamed ()

	TNamed (const char name, const char title)

	TNamed (const TNamed &named)

	TNamed (const TString &name, const TString &title)

virtual	~TNamed ()

void	Clear (Option_t *option="") override

TObject *	Clone (const char *newname="") const override

Int_t	Compare (const TObject *obj) const override

void	Copy (TObject &named) const override

virtual void	FillBuffer (char *&buffer)

const char *	GetName () const override

const char *	GetTitle () const override

ULong_t	Hash () const override

TClass *	IsA () const override

Bool_t	IsSortable () const override

void	ls (Option_t *option="") const override

TNamed &	operator= (const TNamed &rhs)

void	Print (Option_t *option="") const override

virtual void	SetName (const char *name)

virtual void	SetNameTitle (const char name, const char title)

virtual void	SetTitle (const char *title="")

virtual Int_t	Sizeof () const

void	Streamer (TBuffer &) override

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

Public Member Functions inherited from TObject
	TObject ()

	TObject (const TObject &object)

virtual	~TObject ()

void	AbstractMethod (const char *method) const

virtual void	AppendPad (Option_t *option="")

virtual void	Browse (TBrowser *b)

ULong_t	CheckedHash ()

virtual const char *	ClassName () const

virtual void	Delete (Option_t *option="")

virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)

virtual void	Draw (Option_t *option="")

virtual void	DrawClass () const

virtual TObject *	DrawClone (Option_t *option="") const

virtual void	Dump () const

virtual void	Error (const char method, const char msgfmt,...) const

virtual void	Execute (const char method, const char params, Int_t *error=nullptr)

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=nullptr)

virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)

virtual void	Fatal (const char method, const char msgfmt,...) const

virtual TObject *	FindObject (const char *name) const

virtual TObject *	FindObject (const TObject *obj) const

virtual Option_t *	GetDrawOption () const

virtual const char *	GetIconName () const

virtual char *	GetObjectInfo (Int_t px, Int_t py) const

virtual Option_t *	GetOption () const

virtual UInt_t	GetUniqueID () const

virtual Bool_t	HandleTimer (TTimer *timer)

Bool_t	HasInconsistentHash () const

virtual void	Info (const char method, const char msgfmt,...) const

virtual Bool_t	InheritsFrom (const char *classname) const

virtual Bool_t	InheritsFrom (const TClass *cl) const

virtual void	Inspect () const

void	InvertBit (UInt_t f)

Bool_t	IsDestructed () const

virtual Bool_t	IsEqual (const TObject *obj) const

virtual Bool_t	IsFolder () const

R__ALWAYS_INLINE Bool_t	IsOnHeap () const

R__ALWAYS_INLINE Bool_t	IsZombie () const

void	MayNotUse (const char *method) const

virtual Bool_t	Notify ()

void	Obsolete (const char method, const char asOfVers, const char *removedFromVers) const

void	operator delete (void *ptr)

void	operator delete (void ptr, void vp)

void	operator delete[] (void *ptr)

void	operator delete[] (void ptr, void vp)

void *	operator new (size_t sz)

void *	operator new (size_t sz, void *vp)

void *	operator new[] (size_t sz)

void *	operator new[] (size_t sz, void *vp)

TObject &	operator= (const TObject &rhs)

virtual void	Paint (Option_t *option="")

virtual void	Pop ()

virtual Int_t	Read (const char *name)

virtual void	RecursiveRemove (TObject *obj)

void	ResetBit (UInt_t f)

virtual void	SaveAs (const char filename="", Option_t option="") const

virtual void	SavePrimitive (std::ostream &out, Option_t *option="")

void	SetBit (UInt_t f)

void	SetBit (UInt_t f, Bool_t set)

virtual void	SetDrawOption (Option_t *option="")

virtual void	SetUniqueID (UInt_t uid)

void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

virtual void	SysError (const char method, const char msgfmt,...) const

R__ALWAYS_INLINE Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

virtual void	UseCurrentStyle ()

virtual void	Warning (const char method, const char msgfmt,...) const

virtual Int_t	Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0)

virtual Int_t	Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0) const

Public Attributes
std::ifstream	f_in

Public Attributes inherited from TObject
	kBitMask

	kCanDelete

	kCannotPick

	kHasUUID

	kInconsistent

	kInvalidObject

	kIsOnHeap

	kIsReferenced

	kMustCleanup

	kNoContextMenu

	kNotDeleted

	kObjInCanvas

	kOverwrite

	kSingleKey

	kWriteDelete

	kZombie

Private Member Functions
void	AddParameters (const KVString &pattern)

void	init ()

void	StoreParameters (const KVString &pattern)

Private Attributes
KVString	comment_string

KVString	file_name

std::vector< std::string >	items

Int_t	nline

KVString	reading_line

Bool_t	skip_comments = false

Bool_t	status

Additional Inherited Members
Static Public Member Functions inherited from KVBase
static Bool_t	AreEqual (Double_t x, Double_t y, Long64_t maxdif=1)
	Comparison between two 64-bit floating-point values.

static void	BackupFileWithDate (const Char_t *path)

static void	CombineFiles (const Char_t file1, const Char_t file2, const Char_t *newfilename, Bool_t keep=kTRUE)

static void	Deprecated (const char method, const char advice)

static Bool_t	FindClassSourceFiles (const Char_t class_name, KVString &imp_file, KVString &dec_file, const Char_t dir_name=".")

static Bool_t	FindExecutable (TString &exec, const Char_t *path="$(PATH)")

static const Char_t *	FindFile (const Char_t *search, TString &wfil)

static const Char_t *	GetBINDIRFilePath (const Char_t *namefile="")

static const Char_t *	GetDATABASEFilePath ()

static const Char_t *	GetDATADIRFilePath (const Char_t *namefile="")

static Bool_t	GetDataSetEnv (const Char_t dataset, const Char_t type, Bool_t defval)

static const Char_t *	GetDataSetEnv (const Char_t dataset, const Char_t type, const Char_t *defval)

static Double_t	GetDataSetEnv (const Char_t dataset, const Char_t type, Double_t defval)

static const Char_t *	GetETCDIRFilePath (const Char_t *namefile="")

static const Char_t *	GetExampleFilePath (const Char_t library, const Char_t namefile)
	Return full path to example file for given library (="KVMultiDet", "BackTrack", etc.)

static const Char_t *	GetINCDIRFilePath (const Char_t *namefile="")

static const Char_t *	GetKVBuildDate ()
	Returns KaliVeda build date.

static const Char_t *	GetKVBuildDir ()
	Returns top-level directory used for build.

static const Char_t *	GetKVBuildTime ()
	Returns KaliVeda build time.

static const Char_t *	GetKVBuildType ()
	Returns KaliVeda build type (cmake build: Release, Debug, RelWithDebInfo, ...)

static const Char_t *	GetKVBuildUser ()
	Returns username of person who performed build.

static const Char_t *	GetKVSourceDir ()
	Returns top-level directory of source tree used for build.

static const Char_t *	GetKVVersion ()
	Returns KaliVeda version string.

static const Char_t *	GetLIBDIRFilePath (const Char_t *namefile="")

static const Char_t *	GetListOfPlugins (const Char_t *base)

static const Char_t *	GetListOfPluginURIs (const Char_t *base)

static const Char_t *	GetPluginURI (const Char_t base, const Char_t plugin)

static void	GetTempFileName (TString &base)

static const Char_t *	GetTEMPLATEDIRFilePath (const Char_t *namefile="")

static const Char_t *	GetWORKDIRFilePath (const Char_t *namefile="")

static const Char_t *	gitBranch ()
	Returns git branch of sources.

static const Char_t *	gitCommit ()
	Returns last git commit of sources.

static void	InitEnvironment ()

static bool	is_gnuinstall ()

static Bool_t	IsThisAPlugin (const TString &uri, TString &base)

static TPluginHandler *	LoadPlugin (const Char_t base, const Char_t uri="0")

static Bool_t	OpenContextMenu (const char method, TObject obj, const char *alt_method_name="")

static void	OpenTempFile (TString &base, std::ofstream &fp)

static void	PrintSplashScreen ()
	Prints welcome message and infos on version etc.

static Bool_t	SearchAndOpenKVFile (const Char_t name, KVSQLite::database &dbfile, const Char_t kvsubdir="")

static Bool_t	SearchAndOpenKVFile (const Char_t name, std::ifstream &file, const Char_t kvsubdir="", KVLockfile *locks=0)

static Bool_t	SearchAndOpenKVFile (const Char_t name, std::ofstream &file, const Char_t kvsubdir="", KVLockfile *locks=0)

static Bool_t	SearchKVFile (const Char_t name, TString &fullpath, const Char_t kvsubdir="")

static const Char_t *	WorkingDirectory ()

Static Public Member Functions inherited from TNamed
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

Static Public Member Functions inherited from TObject
static TClass *	Class ()

static const char *	Class_Name ()

static constexpr Version_t	Class_Version ()

static const char *	DeclFileName ()

static Longptr_t	GetDtorOnly ()

static Bool_t	GetObjectStat ()

static void	SetDtorOnly (void *obj)

static void	SetObjectStat (Bool_t stat)

Protected Member Functions inherited from TObject
virtual void	DoError (int level, const char location, const char fmt, va_list va) const

void	MakeZombie ()

Protected Attributes inherited from TNamed
TString	fName

TString	fTitle

Protected Attributes inherited from TObject
	kOnlyPrepStep

Member Enumeration Documentation

◆ ReadStatus

enum class KVFileReader::ReadStatus

strong

status returned by each method used to read a line in the file

Enumerator
EmptyLine	last line read was empty (only whitespace)
OK	successful read and import of parameters from line
ParamMismatch	the number of parameters read from line does not correspond to expectations
CommentLine	last line read was a comment line
EndOfFile	end of file reached

Definition at line 158 of file KVFileReader.h.

Constructor & Destructor Documentation

◆ KVFileReader()

KVFileReader::KVFileReader ( const KVString & comments = "" )

inline

Parameters

[in] comments if given, any lines beginning with the given string will be ignored

Definition at line 182 of file KVFileReader.h.

Member Function Documentation

◆ AddParameters()

void KVFileReader::AddParameters ( const KVString & pattern )

inlineprivate

Add values of columnar data in last read line according to delimiter(s) in pattern to list of values read from a previous line with either StoreParameters() or AddParameters()

Definition at line 136 of file KVFileReader.h.

◆ Clear()

void KVFileReader::Clear ( Option_t * = "" )

inlinevirtual

Reimplemented from KVBase.

Definition at line 194 of file KVFileReader.h.

◆ CloseFile()

void KVFileReader::CloseFile ( )

inline

Close file if it is open

Definition at line 236 of file KVFileReader.h.

◆ GetCurrentLine()

KVString KVFileReader::GetCurrentLine ( )

inline

Definition at line 319 of file KVFileReader.h.

◆ GetDoubleReadPar()

Double_t KVFileReader::GetDoubleReadPar ( Int_t pos ) const

inline

Definition at line 333 of file KVFileReader.h.

◆ GetFileName()

KVString KVFileReader::GetFileName ( )

inline

Definition at line 189 of file KVFileReader.h.

◆ GetIntReadPar()

Int_t KVFileReader::GetIntReadPar ( Int_t pos ) const

inline

Definition at line 337 of file KVFileReader.h.

◆ GetNlineRead()

Int_t KVFileReader::GetNlineRead ( ) const

inline

Definition at line 328 of file KVFileReader.h.

◆ GetNparRead()

Int_t KVFileReader::GetNparRead ( ) const

inline

Definition at line 324 of file KVFileReader.h.

◆ GetReadPar()

KVString KVFileReader::GetReadPar ( Int_t pos ) const

inline

Definition at line 341 of file KVFileReader.h.

◆ GetReadStatus()

KVString KVFileReader::GetReadStatus ( ReadStatus s )

inline

Definition at line 166 of file KVFileReader.h.

◆ init()

void KVFileReader::init ( void )

inlineprivate

Definition at line 122 of file KVFileReader.h.

◆ IsOK()

Bool_t KVFileReader::IsOK ( )

inline

Returns: true if file is open and ready for reading

Definition at line 230 of file KVFileReader.h.

◆ OpenFileToRead()

Bool_t KVFileReader::OpenFileToRead ( const KVString & filename )

inline

Parameters

[in] filename name or full path to file to be read. shell characters, environment variables are accepted.

Open file for reading

Returns: true if file is open for reading, false in case of a problem opening the file

Definition at line 209 of file KVFileReader.h.

◆ PreparForReadingAgain()

Bool_t KVFileReader::PreparForReadingAgain ( )

inline

Close current file, reset file reader, then reopen file for reading

Returns: true if file is open for reading, false in case of a problem opening the file

Definition at line 199 of file KVFileReader.h.

◆ ReadLine()

ReadStatus KVFileReader::ReadLine ( const KVString & pattern = "" )

inline

Read the next line from the file, store any parameter values read

Returns: status of file after reading

Parameters

[in] pattern if given, contains separator(s) to be used to separate & store values of columnar data (see KVString::Begin())

Definition at line 242 of file KVFileReader.h.

◆ ReadLineAndAdd()

ReadStatus KVFileReader::ReadLineAndAdd ( const KVString & pattern = "" )

inline

Read the next line from the file, add any parameter values read to those already stored

Returns: status of file after reading

Parameters

[in] pattern if given, contains separator(s) to be used to separate & store values of columnar data (see KVString::Begin())

Definition at line 260 of file KVFileReader.h.

◆ ReadLineAndCheck()

ReadStatus KVFileReader::ReadLineAndCheck	(	Int_t	nexpect,
		const KVString &	pattern
	)

inline

Read the next line from the file, store any parameter values read

Returns: status of file after reading, notably KVFileReader::ReadStatus::ParamMismatch if incorrect number of values is found

Parameters

[in]	pattern	contains separator(s) to be used to separate & store values of columnar data (see KVString::Begin())
[in]	nexpext	the expected number of items of columnar data in the line

Definition at line 278 of file KVFileReader.h.

◆ ReuseLineAndCheck()

ReadStatus KVFileReader::ReuseLineAndCheck	(	Int_t	nexpect,
		const KVString &	pattern
	)

inline

Same as ReadLineAndCheck() except that instead of reading a new line we re-use the last read line

Returns: status of file after reading, notably KVFileReader::ReadStatus::ParamMismatch if incorrect number of values is found

Parameters

[in]	pattern	contains separator(s) to be used to separate & store values of columnar data (see KVString::Begin())
[in]	nexpext	the expected number of items of columnar data in the line

Definition at line 303 of file KVFileReader.h.

◆ StoreParameters()

void KVFileReader::StoreParameters ( const KVString & pattern )

inlineprivate

Store values of columnar data in last read line according to delimiter(s) in pattern

Definition at line 128 of file KVFileReader.h.

Member Data Documentation

◆ comment_string

KVString KVFileReader::comment_string

private

Definition at line 147 of file KVFileReader.h.

◆ f_in

std::ifstream KVFileReader::f_in

Definition at line 153 of file KVFileReader.h.

◆ file_name

KVString KVFileReader::file_name

private

Definition at line 147 of file KVFileReader.h.

◆ items

std::vector<std::string> KVFileReader::items

private

Definition at line 146 of file KVFileReader.h.

◆ nline

Int_t KVFileReader::nline

private

Definition at line 148 of file KVFileReader.h.

◆ reading_line

KVString KVFileReader::reading_line

private

Definition at line 147 of file KVFileReader.h.

◆ skip_comments

Bool_t KVFileReader::skip_comments = false

private

Definition at line 150 of file KVFileReader.h.

◆ status

Bool_t KVFileReader::status

private

Definition at line 149 of file KVFileReader.h.

Detailed Description

Public Types

Public Member Functions

Public Attributes

Private Member Functions

Private Attributes

Additional Inherited Members

Member Enumeration Documentation

◆ ReadStatus

Constructor & Destructor Documentation

◆ KVFileReader()

Member Function Documentation

◆ AddParameters()

◆ Clear()

◆ CloseFile()

◆ GetCurrentLine()

◆ GetDoubleReadPar()

◆ GetFileName()

◆ GetIntReadPar()

◆ GetNlineRead()

◆ GetNparRead()

◆ GetReadPar()

◆ GetReadStatus()

◆ init()

◆ IsOK()

◆ OpenFileToRead()

◆ PreparForReadingAgain()

◆ ReadLine()

◆ ReadLineAndAdd()

◆ ReadLineAndCheck()

◆ ReuseLineAndCheck()

◆ StoreParameters()

Member Data Documentation

◆ comment_string

◆ f_in

◆ file_name

◆ items

◆ nline

◆ reading_line

◆ skip_comments

◆ status