Hint_scanner Class Reference

Lexical scanner for hint comments. More...

#include <sql_lex_hints.h>

Public Member Functions
	Hint_scanner (THD *thd, size_t lineno_arg, const char *buf, size_t len, sql_digest_state *digest_state_arg)
	Constructor. More...
size_t	get_lineno () const
const char *	get_ptr () const
sql_digest_state *	get_digest ()
void	syntax_warning (const char *msg) const
	Push a warning message into MySQL error stack with line and position information. More...
int	get_next_token ()

Public Attributes
const char *	raw_yytext
	Current token (yytext) origin in the input_buf. More...
const char *	yytext
	Current token pointer (may be converted allocated string outside input_buf. More...
size_t	yyleng
	Length of the current token (see yytext) More...
bool	has_hints
	True if a hint comment is not empty (has any hints). More...

Protected Member Functions
int	scan ()
template<hint_lex_char_classes Quote>
int	scan_quoted ()
int	scan_ident ()
int	scan_multiplier_or_ident ()
int	scan_query_block_name ()
int	scan_ident_or_keyword ()
int	scan_number_or_multiplier_or_ident ()
int	scan_fraction_digits ()
bool	eof () const
char	peek_byte () const
hint_lex_char_classes	peek_class () const
hint_lex_char_classes	peek_class2 () const
void	skip_newline ()
uchar	get_byte ()
void	skip_byte ()
void	skip_byte (char byte)
	Skips the next byte. More...
void	skip_byte (const char *str)
	Skips the next byte. More...
bool	skip_mb ()
void	adjust_token ()
void	start_token ()
template<hint_lex_char_classes Separator>
void	compact (LEX_STRING *to, const char *from, size_t len, size_t doubles)
void	add_hint_token_digest ()
	Add hint tokens to main lexer's digest calculation buffer. More...

Private Member Functions
void	add_digest (uint token)
	Helper function to check digest buffer for overflow before adding tokens. More...

Private Attributes
THD *	thd
const CHARSET_INFO *	cs
const bool	is_ansi_quotes
size_t	lineno
const hint_lex_char_classes *	char_classes
const char *	input_buf
const char *	input_buf_end
const char *	ptr
int	prev_token
sql_digest_state *	digest_state
	Digest buffer interface to append tokens. More...

Detailed Description

Lexical scanner for hint comments.

When the main lexical scanner recognizes the "/*+" delimiter, it calls the hint parser (my_hint_parser_parse) to consume the rest of hint tokens including the *‍/ delimiter. The hint parser uses Hint_scanner as its own lexer to scan hint-specific tokens.

Constructor & Destructor Documentation

Hint_scanner()

Hint_scanner::Hint_scanner	(	THD *	thd_arg,
		size_t	lineno_arg,
		const char *	buf,
		size_t	len,
		sql_digest_state *	digest_state_arg
	)

Constructor.

Parameters

thd_arg	The thread handler.
lineno_arg	The starting line number of a hint string in a query.
buf	The rest of a query buffer with hints at the start.
len	The length of the buf.
digest_state_arg	The digest buffer to output scanned token data.

Member Function Documentation

add_digest()

void Hint_scanner::add_digest ( uint  token )

inlineprivate

Helper function to check digest buffer for overflow before adding tokens.

Parameters

token

A token number to add.

add_hint_token_digest()

void Hint_scanner::add_hint_token_digest ( )

protected

Add hint tokens to main lexer's digest calculation buffer.

adjust_token()

void Hint_scanner::adjust_token ( )

inlineprotected

compact()

template<hint_lex_char_classes Separator>

void Hint_scanner::compact ( LEX_STRING *  to, const char *  from, size_t  len, size_t  doubles  )

inlineprotected

eof()

bool Hint_scanner::eof ( ) const

inlineprotected

get_byte()

uchar Hint_scanner::get_byte ( )

inlineprotected

get_digest()

sql_digest_state * Hint_scanner::get_digest ( )

inline

get_lineno()

size_t Hint_scanner::get_lineno ( ) const

inline

get_next_token()

int Hint_scanner::get_next_token ( )

inline

get_ptr()

const char * Hint_scanner::get_ptr ( ) const

inline

peek_byte()

char Hint_scanner::peek_byte ( ) const

inlineprotected

peek_class()

hint_lex_char_classes Hint_scanner::peek_class ( ) const

inlineprotected

peek_class2()

hint_lex_char_classes Hint_scanner::peek_class2 ( ) const

inlineprotected

scan()

int Hint_scanner::scan ( )

protected

scan_fraction_digits()

int Hint_scanner::scan_fraction_digits ( )

inlineprotected

scan_ident()

int Hint_scanner::scan_ident ( )

inlineprotected

scan_ident_or_keyword()

int Hint_scanner::scan_ident_or_keyword ( )

inlineprotected

scan_multiplier_or_ident()

int Hint_scanner::scan_multiplier_or_ident ( )

inlineprotected

scan_number_or_multiplier_or_ident()

int Hint_scanner::scan_number_or_multiplier_or_ident ( )

inlineprotected

scan_query_block_name()

int Hint_scanner::scan_query_block_name ( )

inlineprotected

scan_quoted()

template<hint_lex_char_classes Quote>

int Hint_scanner::scan_quoted ( )

inlineprotected

skip_byte() [1/3]

void Hint_scanner::skip_byte ( )

inlineprotected

skip_byte() [2/3]

void Hint_scanner::skip_byte ( char  byte )

inlineprotected

Skips the next byte.

In the debug mode, abort if it's not found in byte.

Parameters

byte	A byte to compare with the byte we skip. Unused in non-debug builds.

skip_byte() [3/3]

void Hint_scanner::skip_byte ( const char *  str )

inlineprotected

Skips the next byte.

In the debug mode, abort if it's not found in str.

Parameters

str	A string of characters to compare with the next byte. Unused in non-debug builds.

skip_mb()

bool Hint_scanner::skip_mb ( )

inlineprotected

skip_newline()

void Hint_scanner::skip_newline ( )

inlineprotected

start_token()

void Hint_scanner::start_token ( )

inlineprotected

syntax_warning()

void Hint_scanner::syntax_warning

(

const char *

msg

)

const

Push a warning message into MySQL error stack with line and position information.

This function provides semantic action implementers with a way to push the famous "You have a syntax error near..." error message into the error stack, which is normally produced only if a parse error is discovered internally by the Bison generated parser.

Member Data Documentation

char_classes

const hint_lex_char_classes* Hint_scanner::char_classes

private

cs

const CHARSET_INFO* Hint_scanner::cs

private

digest_state

sql_digest_state* Hint_scanner::digest_state

private

Digest buffer interface to append tokens.

has_hints

bool Hint_scanner::has_hints

True if a hint comment is not empty (has any hints).

input_buf

const char* Hint_scanner::input_buf

private

input_buf_end

const char* Hint_scanner::input_buf_end

private

is_ansi_quotes

const bool Hint_scanner::is_ansi_quotes

private

lineno

size_t Hint_scanner::lineno

private

prev_token

int Hint_scanner::prev_token

private

ptr

const char* Hint_scanner::ptr

private

raw_yytext

const char* Hint_scanner::raw_yytext

Current token (yytext) origin in the input_buf.

thd

THD* Hint_scanner::thd

private

yyleng

size_t Hint_scanner::yyleng

Length of the current token (see yytext)

yytext

const char* Hint_scanner::yytext

Current token pointer (may be converted allocated string outside input_buf.

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

• sql/sql_lex_hints.h
• sql/sql_lex_hints.cc