elftosb::ElftosbLexer Class Reference

Lexical scanner class for elftosb command files. More...

#include <ElftosbLexer.h>

Inheritance diagram for elftosb::ElftosbLexer:

Collaboration diagram for elftosb::ElftosbLexer:

Public Member Functions
	ElftosbLexer (istream &inputStream)
	Constructor.
virtual int	yylex ()
	Lexer interface. Returns one token.
virtual void	getSymbolValue (YYSTYPE *value)
	Returns the value for the most recently produced token in value.
token_loc_t &	getLocation ()
	Returns the current token's location in loc.
Source names
void	addSourceName (std::string *ident)
bool	isSourceName (std::string *ident)
Public Member Functions inherited from yyFlexLexer
	yyFlexLexer (FLEX_STD istream *arg_yyin=0, FLEX_STD ostream *arg_yyout=0)
void	yy_switch_to_buffer (struct yy_buffer_state *new_buffer)
struct yy_buffer_state *	yy_create_buffer (FLEX_STD istream *s, int size)
void	yy_delete_buffer (struct yy_buffer_state *b)
void	yyrestart (FLEX_STD istream *s)
void	yypush_buffer_state (struct yy_buffer_state *new_buffer)
void	yypop_buffer_state ()
virtual void	switch_streams (FLEX_STD istream *new_in, FLEX_STD ostream *new_out=0)
virtual int	yywrap ()
Public Member Functions inherited from FlexLexer
const char *	YYText () const
int	YYLeng () const
int	yylex (FLEX_STD istream *new_in, FLEX_STD ostream *new_out=0)
int	lineno () const
int	debug () const
void	set_debug (int flag)

Protected Types
typedef std::vector< std::string >	string_vector_t

Protected Member Functions
virtual void	LexerError (const char *msg)
	Throw an elftosb::lexical_error exception.
int	processStringEscapes (const char *in, char *out)
	Process a string containing escape sequences. More...
Protected Member Functions inherited from yyFlexLexer
virtual size_t	LexerInput (char *buf, size_t max_size)
virtual void	LexerOutput (const char *buf, size_t size)
void	yyunput (int c, char *buf_ptr)
int	yyinput ()
void	yy_load_buffer_state ()
void	yy_init_buffer (struct yy_buffer_state *b, FLEX_STD istream *s)
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 current_state)
int	yy_get_next_buffer ()
void	yyensure_buffer_stack (void)

Protected Attributes
YYSTYPE	m_symbolValue
	Value for the current token.
int	m_line
	Current line number.
token_loc_t	m_location
	Location for the current token.
Blob *	m_blob
	The binary object value as its being constructed.
int	m_blobFirstLine
	Line number for the first character of a blob.
string_vector_t	m_sources
	Vector of source identifiers;.
Protected Attributes inherited from yyFlexLexer
int	yy_start_stack_ptr
int	yy_start_stack_depth
int *	yy_start_stack
FLEX_STD istream *	yyin
FLEX_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

Lexical scanner class for elftosb command files.

This class is a subclass of the standard C++ lexer class produced by Flex. It's primary purpose is to provide a clean way to report values for symbols, without using the yylval global. This is necessary because the parser produced by Bison is a "pure" parser.

In addition, this class manages a list of source names generated by parsing. The lexer uses this list to determine if an identifier is a source name or a constant identifier.

Member Function Documentation

int ElftosbLexer::processStringEscapes ( const char *  in, char *  out  )

protected

Process a string containing escape sequences.

Reads the in string and writes to the out string. These strings can be the same string since the read head is always in front of the write head.

Parameters

[in]	in	Input string containing C-style escape sequences.
[out]	out	Output string. All escape sequences in the input string have been converted to the actual characters. May point to the same string as in.

Returns

The length of the resulting out string. This length is necessary because the string may have contained escape sequences that inserted null characters.

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

• ElftosbLexer.h
• ElftosbLexer.cpp