casa::viewer::ds9lex Class Reference

Scanner is a derived class to add some extra function to the scanner class. More...

#include <ds9lex.h>

Inheritance diagram for casa::viewer::ds9lex:

Public Member Functions
	ds9lex (std::istream *yyin=0, std::ostream *yyout=0)
	Create a new scanner object. More...
	~ds9lex ()
virtual ds9parse::token_type	lex (ds9parse::semantic_type *yylval, ds9parse::location_type *)
	This is the main lexing function. More...
void	begin (int, int)
void	set_debug (bool b)
	Enable debug output (via arg_yyout) if compiled into the scanner. More...
void	discard (int)

Detailed Description

Scanner is a derived class to add some extra function to the scanner class.

Flex itself creates a class named yyFlexLexer, which is renamed using macros to ds9lex_FlexLexer. However we change the context of the generated yylex() function to be contained within the ds9lex class. This is required because the yylex() defined in ds9lex_display/ds9/ds9FlexLexer.has no parameters.

Definition at line 36 of file ds9lex.h.

Constructor & Destructor Documentation

casa::viewer::ds9lex::ds9lex ( std::istream *  yyin = 0, std::ostream *  yyout = 0  )

inline

Create a new scanner object.

The streams arg_yyin and arg_yyout default to cin and cout, but that assignment is only made when initializing in yylex().

Definition at line 41 of file ds9lex.h.

casa::viewer::ds9lex::~ds9lex ( )

inline

Definition at line 42 of file ds9lex.h.

Member Function Documentation

void casa::viewer::ds9lex::begin	(	int	,
		int
	)

void casa::viewer::ds9lex::discard

(

int

)

virtual ds9parse::token_type casa::viewer::ds9lex::lex ( ds9parse::semantic_type *  yylval, ds9parse::location_type *    )

virtual

This is the main lexing function.

It is generated by flex according to the macro declaration YY_DECL above. The generated bison parser then calls this virtual function to fetch new tokens.

void casa::viewer::ds9lex::set_debug

(

bool

b

)

Enable debug output (via arg_yyout) if compiled into the scanner.

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

• casa/code/display/ds9/ds9lex.h