PGENLib.InputStream Class Reference

This class implements a wrapper around a stream, with the following additional capabilities:

1. It tracks the line number and column number;
2. It permits to "un-read" characters and tokens.

More...

Public Member Functions
	InputStream (Stream stream, string fileName="", int tabulations=4)
	Basic constructor for the class.
char	ReadChar ()
	Read a new character from the stream.
void	UnreadChar (char ch)
	Push a character back to the stream.
void	SkipWhitespacesAndComments ()
	Keep reading characters until a non-whitespace/non-comment character is found.
StringToken	ParseStringToken (SourceLocation tokenLocation)
	Read a StringToken in a given location. More...
LiteralNumberToken	ParseFloatToken (string firstChar, SourceLocation tokenLocation)
	Read a LiteralNumberToken in a given location. More...
Token	ReadToken ()
	Reads a token from the stream More...
void	UnreadToken (Token token)
	Make as if token were never read from inputFile More...

Public Attributes
Stream	Stream
SourceLocation	Location
char	SavedChar
SourceLocation	SavedLocation
int	Tabulations
Token?	SavedToken

Private Member Functions
void	UpdatePosition (char ch)
	Shift the cursor one position ahead. More...
Token	ParseKeywordOrIdentifierToken (char firstChar, SourceLocation tokenLocation)
	Read either a KeywordTokeN or a IdentifierToken in a given location. More...

Detailed Description

This class implements a wrapper around a stream, with the following additional capabilities:

1. It tracks the line number and column number;
2. It permits to "un-read" characters and tokens.

Parameters:

Stream	a Stream object, used to read a file;
Location	a SourceLocation object;
SavedChar	a char? object, holding the un-read character or being null, if no char has been un-read;
SavedLocation	a SourceLocation object with the location of the un-read character or token;
Tabulation	a Ray object that hit the surface;
SavedToken	a Token object, holding the un-read token or being null, if no token has been un-read.

Member Function Documentation

ParseFloatToken()

LiteralNumberToken PGENLib.InputStream.ParseFloatToken	(	string	firstChar,
		SourceLocation	tokenLocation
	)

Read a LiteralNumberToken in a given location.

Parameters

firstChar
tokenLocation

Returns

Exceptions

GrammarErrorException

ParseKeywordOrIdentifierToken()

Token PGENLib.InputStream.ParseKeywordOrIdentifierToken ( char  firstChar, SourceLocation  tokenLocation  )

private

Read either a KeywordTokeN or a IdentifierToken in a given location.

Parameters

firstChar
tokenLocation

Returns

ParseStringToken()

StringToken PGENLib.InputStream.ParseStringToken

(

SourceLocation

tokenLocation

)

Read a StringToken in a given location.

Parameters

tokenLocation

The location in the file

Returns

The StringToken we just read.

ReadToken()

Token PGENLib.InputStream.ReadToken

(

)

Reads a token from the stream

Returns

Exceptions

GrammarErrorException

a lexical error is found

UnreadToken()

void PGENLib.InputStream.UnreadToken

(

Token

token

)

Make as if token were never read from inputFile

Parameters

token

UpdatePosition()

void PGENLib.InputStream.UpdatePosition ( char  ch )

private

Shift the cursor one position ahead.

Parameters

ch

---

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

• /Users/fra/Documenti/Università/Magistrale/SNIF/PhotoGENius/PGENLib/SceneFiles.cs