SEAMS::Scanner Class Reference

#include <apr_scanner.h>

Public Member Functions
	Scanner (Aprepro &aprepro_yyarg, std::istream *in=nullptr, std::ostream *out=nullptr)
	~Scanner () override
void	add_include_file (const std::string &filename, bool must_exist)
int	yywrap () override
void	yyerror (const char *s)
void	LexerOutput (const char *buf, int size) override
int	LexerInput (char *buf, int max_size) override
virtual Parser::token_type	lex (Parser::semantic_type *yylval)
char *	rescan (char *string)
char *	execute (char *string)
char *	if_handler (double x)
char *	elseif_handler (double x)
char *	switch_handler (double x)
char *	case_handler (double x)
void	set_debug (bool b)
void	save_history_string ()

Public Attributes
class Aprepro &	aprepro

Friends
class	Parser

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 SEAMSFlexLexer. However we change the context of the generated yylex() function to be contained within the Scanner class. This is required because the yylex() defined in SEAMSFlexLexer has no parameters.

Constructor & Destructor Documentation

Scanner()

SEAMS::Scanner::Scanner ( Aprepro &  aprepro_yyarg, std::istream *  in = nullptr, std::ostream *  out = nullptr  )

explicit

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().

~Scanner()

SEAMS::Scanner::~Scanner ( )

override

Required for virtual functions

Member Function Documentation

add_include_file()

void SEAMS::Scanner::add_include_file	(	const std::string &	filename,
		bool	must_exist
	)

case_handler()

char * SEAMS::Scanner::case_handler

(

double

x

)

elseif_handler()

char * SEAMS::Scanner::elseif_handler

(

double

x

)

execute()

char * SEAMS::Scanner::execute

(

char *

string

)

if_handler()

char * SEAMS::Scanner::if_handler

(

double

x

)

lex()

virtual Parser::token_type SEAMS::Scanner::lex ( Parser::semantic_type *  yylval )

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.

LexerInput()

int SEAMS::Scanner::LexerInput ( char *  buf, int  max_size  )

override

LexerOutput()

void SEAMS::Scanner::LexerOutput ( const char *  buf, int  size  )

override

rescan()

char * SEAMS::Scanner::rescan

(

char *

string

)

save_history_string()

void SEAMS::Scanner::save_history_string

(

)

set_debug()

void SEAMS::Scanner::set_debug

(

bool

b

)

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

switch_handler()

char * SEAMS::Scanner::switch_handler

(

double

x

)

yyerror()

void SEAMS::Scanner::yyerror

(

const char *

s

)

yywrap()

int SEAMS::Scanner::yywrap ( )

override

Friends And Related Function Documentation

Parser

friend class Parser

friend

Member Data Documentation

aprepro

class Aprepro& SEAMS::Scanner::aprepro

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

• apr_scanner.h
• apr_scanner.cc