C# Class PdfSharp.Pdf.Content.CLexer

Lexical analyzer for PDF content files. Adobe specifies no grammar, but it seems that it is a simple post-fix notation.

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Private Properties

Property	Type	Description
AppendAndScanNextChar	char
IsDelimiter	bool
IsOperatorChar	bool
IsWhiteSpace	bool
ScanNextChar	char

Public Methods

Method	Description
CLexer ( byte content ) : System	Initializes a new instance of the Lexer class.
ClearToken ( ) : void	Resets the current token to the empty string.
MoveToNonWhiteSpace ( ) : char	If the current character is not a white space, the function immediately returns it. Otherwise the PDF cursor is moved forward to the first non-white space or EOF. White spaces are NUL, HT, LF, FF, CR, and SP.
ScanComment ( ) : CSymbol	Scans a comment line. (Not yet used, comments are skipped by lexer.)
ScanHexadecimalString ( ) : CSymbol
ScanInlineImage ( ) : CSymbol	Scans the bytes of an inline image
ScanLiteralString ( ) : CSymbol
ScanName ( ) : CSymbol	Scans a name.
ScanNextToken ( ) : CSymbol	Reads the next token and returns its type.
ScanNumber ( ) : CSymbol	Scans an integer or real number.
ScanOperator ( ) : CSymbol	Scans an operator.

Private Methods

Method	Description
AppendAndScanNextChar ( ) : char	Appends current character to the token and reads next one.
IsDelimiter ( char ch ) : bool	Indicates whether the specified character is a PDF delimiter character.
IsOperatorChar ( char ch ) : bool	Indicates whether the specified character is an content operator character.
IsWhiteSpace ( char ch ) : bool	Indicates whether the specified character is a content stream white-space character.
ScanNextChar ( ) : char	Move current position one character further in content stream.

Method Details

CLexer() public method

Initializes a new instance of the Lexer class.

public CLexer ( byte content ) : System
content	byte
return	System

ClearToken() public method

Resets the current token to the empty string.

public ClearToken ( ) : void
return	void

MoveToNonWhiteSpace() public method

If the current character is not a white space, the function immediately returns it. Otherwise the PDF cursor is moved forward to the first non-white space or EOF. White spaces are NUL, HT, LF, FF, CR, and SP.

public MoveToNonWhiteSpace ( ) : char
return	char

ScanComment() public method

Scans a comment line. (Not yet used, comments are skipped by lexer.)

public ScanComment ( ) : CSymbol
return	CSymbol

ScanHexadecimalString() public method

public ScanHexadecimalString ( ) : CSymbol
return	CSymbol

ScanInlineImage() public method

Scans the bytes of an inline image

public ScanInlineImage ( ) : CSymbol
return	CSymbol

ScanLiteralString() public method

public ScanLiteralString ( ) : CSymbol
return	CSymbol

ScanName() public method

Scans a name.

public ScanName ( ) : CSymbol
return	CSymbol

ScanNextToken() public method

Reads the next token and returns its type.

public ScanNextToken ( ) : CSymbol
return	CSymbol

ScanNumber() public method

Scans an integer or real number.

public ScanNumber ( ) : CSymbol
return	CSymbol

ScanOperator() public method

Scans an operator.

public ScanOperator ( ) : CSymbol
return	CSymbol