knowCore::LexerTextStream Class Reference

#include <LexerTextStream.h>

Classes
struct	Element
struct	Private

Public Member Functions
	LexerTextStream (QIODevice *sstream)
	LexerTextStream (const QString &string)
void	setDevice (QIODevice *sstream)
void	setString (const QString &string)
Element	getNextChar ()
Element	getNextNonSeparatorChar ()
void	unget (Element c)
std::tuple< Element, bool >	getString (const QString &terminator)
std::tuple< Element, bool >	getDigit (Element start)
bool	eof () const
void	setBufferSize (std::size_t _size)
std::size_t	bufferSize ()
std::size_t	currentBufferSize ()

Detailed Description

Implement convenient support for lexing SPARQL/Turtle-like languages.

It allows:

• to get the next character in the stream (getNextChar),
• to get the next non seperator character (getNextNonSeparatorChar),
• to push back any character (unget)
• to get a string (getString)
• to get a digit (getDigit)

Constructor & Destructor Documentation

LexerTextStream() [1/2]

LexerTextStream::LexerTextStream

(

QIODevice *

sstream

)

Construct a stream reading from a QIODevice. With this constructor, LexerTextStream uses an internal buffer.

LexerTextStream() [2/2]

LexerTextStream::LexerTextStream

(

const QString &

string

)

Construct a stream reading from a QString. With this constructor, LexerTextStream 's internal buffer is equal to string.

Member Function Documentation

bufferSize()

std::size_t LexerTextStream::bufferSize

(

)

Returns

how many bytes are read in the buffer at once

currentBufferSize()

std::size_t LexerTextStream::currentBufferSize

(

)

Returns

the number of bytes currently held in the internal buffer

This value might differs from bufferSize for various reasons:

• not enough data was available in the stream
• if LexerTextStream was initialised with a string, the buffer is equal to the string and the currentBufferSize is equal to the length of the string
• when reading a string, the entire string has to be contained in the buffer

getDigit()

std::tuple< LexerTextStream::Element, bool > LexerTextStream::getDigit

(

LexerTextStream::Element

start

)

Read a digit, the boolean is true if integer

getNextChar()

LexerTextStream::Element LexerTextStream::getNextChar

(

)

Returns

the next char and increment the column counter.

getNextNonSeparatorChar()

LexerTextStream::Element LexerTextStream::getNextNonSeparatorChar

(

)

Returns

the next char that is not a separator (space, tab, return...)

getString()

std::tuple< LexerTextStream::Element, bool > LexerTextStream::getString

(

const QString &

terminator

)

Read a string, the boolean is true if the terminator was found, false otherwise

setBufferSize()

void LexerTextStream::setBufferSize

(

std::size_t

_size

)

Set how many bytes are read in the buffer to _size.

unget()

void LexerTextStream::unget

(

LexerTextStream::Element

c

)

Cancel the reading of the previous char.

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The documentation for this class was generated from the following files:

• knowl/src/knowCore/LexerTextStream.h
• knowl/src/knowCore/LexerTextStream.cpp