SEAMS::Scanner Class Reference

#include <apr_scanner.h>

Inheritance diagram for SEAMS::Scanner:

Collaboration diagram for SEAMS::Scanner:

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 Member Functions inherited from SEAMSFlexLexer
	SEAMSFlexLexer (std::istream *arg_yyin=nullptr, std::ostream *arg_yyout=nullptr)
	~SEAMSFlexLexer () override
void	yy_switch_to_buffer (struct yy_buffer_state *new_buffer) override
struct yy_buffer_state *	yy_create_buffer (std::istream *file, int size) override
void	yy_delete_buffer (struct yy_buffer_state *b) override
void	yyrestart (std::istream *input_file) override
void	yypush_buffer_state (struct yy_buffer_state *new_buffer)
void	yypop_buffer_state ()
int	yylex () override
void	switch_streams (std::istream *new_in, std::ostream *new_out=nullptr) override
Public Member Functions inherited from FlexLexer
	FlexLexer ()
virtual	~FlexLexer ()
const char *	YYText () const
int	YYLeng () const
int	yylex (std::istream *new_in, std::ostream *new_out=nullptr)
int	lineno () const
int	debug () const
void	set_debug (int flag)

Public Attributes
class Aprepro &	aprepro

Friends
class	Parser

Additional Inherited Members
Protected Member Functions inherited from SEAMSFlexLexer
virtual void	LexerError (const char *msg)
void	yyunput (int c, char *yy_bp)
int	yyinput ()
void	yy_load_buffer_state ()
void	yy_init_buffer (struct yy_buffer_state *b, std::istream *file)
void	yy_flush_buffer (struct yy_buffer_state *b)
void	yy_push_state (int new_state)
void	yy_pop_state ()
int	yy_top_state ()
yy_state_type	yy_get_previous_state ()
yy_state_type	yy_try_NUL_trans (yy_state_type yy_current_state)
int	yy_get_next_buffer ()
void	yyensure_buffer_stack (void)
Protected Attributes inherited from SEAMSFlexLexer
int	yy_start_stack_ptr
int	yy_start_stack_depth
int *	yy_start_stack
std::istream *	yyin
std::ostream *	yyout
char	yy_hold_char
int	yy_n_chars
char *	yy_c_buf_p
int	yy_init
int	yy_start
int	yy_did_buffer_switch_on_eof
size_t	yy_buffer_stack_top
size_t	yy_buffer_stack_max
struct yy_buffer_state **	yy_buffer_stack
yy_state_type	yy_last_accepting_state
char *	yy_last_accepting_cpos
yy_state_type *	yy_state_buf
yy_state_type *	yy_state_ptr
char *	yy_full_match
int *	yy_full_state
int	yy_full_lp
int	yy_lp
int	yy_looking_for_trail_begin
int	yy_more_flag
int	yy_more_len
int	yy_more_offset
int	yy_prev_more_offset
Protected Attributes inherited from FlexLexer
char *	yytext
int	yyleng
int	yylineno
int	yy_flex_debug

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  )

overridevirtual

Reimplemented from SEAMSFlexLexer.

LexerOutput()

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

overridevirtual

Reimplemented from SEAMSFlexLexer.

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 ( )

overridevirtual

Reimplemented from SEAMSFlexLexer.

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