regexp Namespace Reference

Classes
class	Regexp_engine
	This class exposes high-level regular expression operations to the facade. More...
class	Regexp_facade
	This class handles. More...
struct	UErrorCodeHash

Functions
bool	check_icu_status (UErrorCode status, const UParseError *parse_error)
UBool	QueryNotKilled (const void *context, int32_t steps)
	Implements a match callback function for icu that aborts execution if the query was killed. More...
const char *	icu_version_string ()
static bool	EvalExprToCharset (Item *expr, std::u16string *out, int skip=0)
	Evaluates an expression to an output buffer, performing character set conversion to regexp_lib_charset if necessary. More...

Variables
std::unordered_map< UErrorCode, int, UErrorCodeHash >	error_map
	Map from ICU error codes to MySQL dittos. More...
CHARSET_INFO *	regexp_lib_charset = nullptr
static const CHARSET_INFO *	faux_binary_charset = &my_charset_latin1
	When dealing with the binary character set, we tell ICU that we're using CP-1252. More...

Function Documentation

check_icu_status()

bool regexp::check_icu_status	(	UErrorCode	status,
		const UParseError *	parse_error
	)

EvalExprToCharset()

static bool regexp::EvalExprToCharset ( Item *  expr, std::u16string *  out, int  skip = 0  )

static

Evaluates an expression to an output buffer, performing character set conversion to regexp_lib_charset if necessary.

The procedure supports the optimization that code points before the start position are not converted to UTF-16.

Parameters

	expr	The expression to be printed.
[out]	out	Will be cleared, and the result stored.
	skip	If present, this number of code points will be exempted from conversion. If the string is smaller than that, an out of bounds error is raised.

Returns

false on success, true on error.

icu_version_string()

const char * regexp::icu_version_string

(

)

QueryNotKilled()

UBool regexp::QueryNotKilled	(	const void *	context,
		int32_t	steps
	)

Implements a match callback function for icu that aborts execution if the query was killed.

Parameters

context	The session to check for killed query.
steps	Not used.

Return values

false	Query was killed in the session and the match should abort.
true	Query was not killed, matching should continue.

Variable Documentation

error_map

std::unordered_map<UErrorCode, int, UErrorCodeHash> regexp::error_map

Map from ICU error codes to MySQL dittos.

We strive to keep this list in the same order as the enum UErrorCode in common/unicode/utypes.h.

ICU version 67 introduced a new implementation for '\X' "Match a Grapheme Cluster". This means that our bundled version will return ER_REGEXP_MISSING_RESOURCE while for system ICU we return ER_WARN_REGEXP_USING_DEFAULT as a Note.

TODO(tdidriks) Bundle data files in icudt69b/brkitr/ icudt69l/brkitr/ so that bundled and system ICU results are aligned.

faux_binary_charset

const CHARSET_INFO* regexp::faux_binary_charset = &my_charset_latin1

static

When dealing with the binary character set, we tell ICU that we're using CP-1252.

This way, comparisons will happen as the user expects; each octet value is equal to itself, and only to itself. And of course, CP-1252 is known as "latin1" in MySQL.

regexp_lib_charset

CHARSET_INFO * regexp::regexp_lib_charset = nullptr