Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
mdbGeneral(5)			 Version 1.5.5			 mdbGeneral(5)

NAME
       mdbGeneral - General Format

DESCRIPTION
       The mdatabase_load() function returns the data specified	by tags	in the
       form of plist if	the first tag is not Mchartable	nor Mcharset. The keys
       of the returned plist are limited to Minteger, Msymbol, Mtext, and
       Mplist. The type	of the value is	unambiguously determined by the
       corresponding key. If the key is	Minteger, the value is an integer. If
       the key is Msymbol, the value is	a symbol. And so on.

       A number	of expressions are possible to represent a plist. For
       instance, we can	use the	form (K1:V1, K2:V2, ..., Kn:Vn)	to represent a
       plist whose first property key and value	are K1 and V1, second key and
       value are K2 and	V2, and	so on. However,	we can use a simpler
       expression here because the types of plists used	in the m17n database
       are fairly restricted.

       Hereafter, we use an expression,	which is similar to S-expression, to
       represent a plist. (Actually, the default database loader of the	m17n
       library is designed to read data	files written in this expression.)

       The expression consists of one or more elements.	Each element
       represents a property, i.e. a single element of a plist.

       Elements	are separated by one or	more whitespaces, i.e. a space (code
       32), a tab (code	9), or a newline (code 10). Comments begin with	a
       semicolon (;) and extend	to the end of the line.

       The key and the value of	each property are determined based on the type
       of the element as explained below.

       o INTEGER
       An element that matches the regular expression -?[0-9]+ or
       0[xX][0-9A-Fa-f]+ represents a property whose key is Minteger. An
       element matching	the former expression is interpreted as	an integer in
       decimal notation, and one matching the latter is	interpreted as an
       integer in hexadecimal notation.	The value of the property is the
       result of interpretation.
       For instance, the element 0xA0 represents a property whose value	is 160
       in decimal.
       o SYMBOL
       An element that matches the regular expression [^-0-9(]([^\()]|\.)+
       represents a property whose key is  Msymbol. In the element, \t,	\n,
       \r, and \e are replaced with tab	(code 9), newline (code	10), carriage
       return (code 13), and escape (code 27) respectively. Other characters
       following a backslash is	interpreted as it is. The value	of the
       property	is the symbol having the resulting string as its name.
       For instance, the element abc\ def represents a property	whose value is
       the symbol having the name 'abc def'.
       o MTEXT
       An element that matches the regular expression '([^']|\')*' represents
       a property whose	key is Mtext. The backslash escape explained above
       also applies here. r, each part in the element matching the regular
       expression  \[xX][0-9A-Fa-f][0-9A-Fa-f] is replaced with	its
       hexadecimal interpretation.
       After having resolved the backslash escapes, the	byte sequence between
       the double quotes is interpreted	as a UTF-8 sequence and	decoded	into
       an M-text. This M-text is the value of the property.
       o PLIST
       Zero or more elements surrounded	by a pair of parentheses represent a
       property	whose key is Mplist. Whitespaces before	and after a
       parenthesis can be omitted. The value of	the property is	a plist, which
       is the result of	recursive interpretation of the	elements between the
       parentheses.
SYNTAX NOTATION
       In an explanation of a plist format of data, a BNF-like notation	is
       used. In	the notation, non-terminals are	represented by a string	of
       uppercase letters (including '-'	in the middle),	terminals are
       represented by a	string surrounded by '''. Special non-terminals
       INTEGER,	SYMBOL,	MTEXT and PLIST	represents property integer, symbol,
       M-text, or plist	respectively.
EXAMPLE
       Here is an example of database data that	is read	into a plist of	this
       simple format:
       DATA-FORMAT ::=
	   [ INTEGER | SYMBOL |	MTEXT |	FUNC ] *

       FUNC ::=
	   '(' FUNC-NAME FUNC-ARG * ')'

       FUNC-NAME ::=
	   SYMBOL

       FUNC-ARG	::=
	   INTEGER | SYMBOL | MTEXT | '(' FUNC-ARG ')'
       For instance, a data file that contains this text matches the above
       syntax:
       abc 123 (pqr 0xff) "m
       and is read into	this plist:
       1st element: key: Msymbol,  value: abc
       2nd element: key: Minteger, value: 123
       3rd element: key: Mplist,   value: a plist of these elements:
	   1st element:	key Msymbol,  value: pgr
	   2nd element:	key Minteger, value: 255
       4th element: key: Mtext,	   value: m"text
       5th element: key: Mplist,   value: a plist of these elements:
	   1st element:	key: Msymbol, value: __
	   2nd element:	key: Mplist,  value: a plist of	these elements:
	       1st element: key: Mtext,	   value: string
	    2nd	element: key: Msymbol,	value: xyz
	    3rd	element: key: Minteger,	value: -456
COPYRIGHT
       Copyright (C) 2001 Information-technology Promotion Agency (IPA)
       Copyright (C) 2001-2009 National	Institute of Advanced Industrial
       Science and Technology (AIST)
       Permission is granted to	copy, distribute and/or	modify this document
       under the terms of the GNU Free Documentation License
       <http://www.gnu.org/licenses/fdl.html>.

				  15 Oct 2009			 mdbGeneral(5)

NAME | DESCRIPTION | SYNTAX NOTATION | EXAMPLE | COPYRIGHT

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=mdbGeneral&sektion=5&manpath=FreeBSD+12.1-RELEASE+and+Ports>

home | help