X Locale Database Specification Yoshio Horiuchi IBM Japan X Version 11, Release 7.7 Copyright © 1994 IBM Corporation License to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of IBM not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. 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LocaleDB General Database Format Definition Contents of Database XLC_FONTSET Category XLC_XLOCALE Category Sample of X Locale Database Reference Chapter 1. LocaleDB Table of Contents General Database Format Definition Contents of Database XLC_FONTSET Category XLC_XLOCALE Category Sample of X Locale Database Reference General An X Locale Database contains the subset of a user's environment that depends on language, in X Window System. It is made up from one or more categories. Each category consists of some classes and sub-classes. It is provided as a plain ASCII text file, so a user can change its contents easily. It allows a user to customize the behavior of internationalized portion of Xlib without changing Xlib itself. This document describes; ● Database Format Definition ● Contents of Database in sample implementation Since it is hard to define the set of required information for all platforms, only the flexible database format is defined. The available entries in database are implementation dependent. Database Format Definition The X Locale Database contains one or more category definitions. This section describes the format of each category definition. The category definition consists of one or more class definitions. Each class definition has a pair of class name and class value, or has several subclasses which are enclosed by the left brace ({) and the right brace (}). Comments can be placed by using the number sign character (#). Putting the number sign character on the top of the line indicates that the entire line is comment. Also, putting any whitespace character followed by the number sign character indicates that a part of the line (from the number sign to the end of the line) is comment. A line can be continued by placing backslash (\) character as the last character on the line; this continuation character will be discarded from the input. Comment lines cannot be continued on a subsequent line using an escaped new line character. X Locale Database only accepts XPCS, the X Portable Character Set. The reserved symbols are; the quotation mark("), the number sign (#), the semicolon(;), the backslash(\), the left brace({) and the right brace(}). The format of category definition is; CategoryDefinition ::= CategoryHeader CategorySpec CategoryTrailer CategoryHeader ::= CategoryName NL CategorySpec ::= { ClassSpec } CategoryTrailer ::= "END" Delimiter CategoryName NL CategoryName ::= String ClassSpec ::= ClassName Delimiter ClassValue NL ClassName ::= String ClassValue ::= ValueList | "{" NL { ClassSpec } "}" ValueList ::= Value | Value ";" ValueList Value ::= ValuePiece | ValuePiece Value ValuePiece ::= String | QuotedString | NumericString String ::= Char { Char } QuotedString ::= """ QuotedChar { QuotedChar } """ NumericString ::= "\\o" OctDigit { OctDigit }   | "\\d" DecDigit { DecDigit }   | "\\x" HexDigit { HexDigit } Char ::= QuotedChar ::= OctDigit ::= DecDigit ::= HexDigit ::= Delimiter ::= Space { Space } Space ::= | NL ::= Elements separated by vertical bar (|) are alternatives. Curly braces ({...}) indicate zero or more repetitions of the enclosed elements. Square brackets ([...]) indicate that the enclosed element is optional. Quotes ("...") are used around literal characters. The backslash, which is not the top character of the NumericString, is recognized as an escape character, so that the next one character is treated as a literal character. For example, the two-character sequence, ""\"""(the backslash followed by the quotation mark) is recognized and replaced with a quotation mark character. Any whitespace character, that is not the Delimiter, unquoted and unescaped, is ignored. Contents of Database The available categories and classes depend on implementation, because different platform will require different information set. For example, some platform have system locale but some platform don't. Furthermore, there might be a difference in functionality even if the platform has system locale. In current sample implementation, categories listed below are available. XLC_FONTSET:XFontSet relative information XLC_XLOCALE:Character classification and conversion information XLC_FONTSET Category The XLC_FONTSET category defines the XFontSet relative information. It contains the CHARSET_REGISTRY-CHARSET_ENCODING name and character mapping side (GL, GR, etc), and is used in Output Method (OM). ┌───────┬───────────┬──────────────────────────┐ │class │super class│description │ ├───────┼───────────┼──────────────────────────┤ │fsN │  │Nth fontset (N=0,1,2, ...)│ ├───────┼───────────┼──────────────────────────┤ │charset│fsN │list of encoding name │ ├───────┼───────────┼──────────────────────────┤ │font │fsN │list of font encoding name│ └───────┴───────────┴──────────────────────────┘ Includes an encoding information for Nth charset, where N is the index fsN number (0,1,2,...). If there are 4 charsets available in current locale, 4 fontsets, fs0, fs1, fs2 and fs3, should be defined. This class has two subclasses, 'charset' and 'font'. Specifies an encoding information to be used internally in Xlib for this fontset. The format of value is; EncodingInfo ::= EncodingName [ ":" EncodingSide ] EncodingName ::= CHARSET_REGISTRY-CHARSET_ENCODING EncodingSide ::= "GL" | "GR" charset For detail definition of CHARSET_REGISTRY-CHARSET_ENCODING, refer to the X Logical Font Description Conventions document. example:      ISO8859-1:GL Specifies a list of encoding information which is used for searching font appropriate font for this fontset. The left most entry has highest priority. XLC_XLOCALE Category The XLC_XLOCALE category defines character classification, conversion and other character attributes. ┌─────────────────────┬───────────┬────────────────────────────────┐ │class │super class│description │ ├─────────────────────┼───────────┼────────────────────────────────┤ │encoding_name │  │codeset name │ ├─────────────────────┼───────────┼────────────────────────────────┤ │mb_cur_max │  │MB_CUR_MAX │ ├─────────────────────┼───────────┼────────────────────────────────┤ │state_depend_encoding│  │state dependent or not │ ├─────────────────────┼───────────┼────────────────────────────────┤ │wc_encoding_mask │  │for parsing wc string │ ├─────────────────────┼───────────┼────────────────────────────────┤ │wc_shift_bits │  │for conversion between wc and mb│ ├─────────────────────┼───────────┼────────────────────────────────┤ │csN │  │Nth charset (N=0,1,2,...) │ ├─────────────────────┼───────────┼────────────────────────────────┤ │side │csN │mapping side (GL, etc) │ ├─────────────────────┼───────────┼────────────────────────────────┤ │length │csN │length of a character │ ├─────────────────────┼───────────┼────────────────────────────────┤ │mb_encoding │csN │for parsing mb string │ ├─────────────────────┼───────────┼────────────────────────────────┤ │wc_encoding │csN │for parsing wc string │ ├─────────────────────┼───────────┼────────────────────────────────┤ │ct_encoding │csN │list of encoding name for ct │ └─────────────────────┴───────────┴────────────────────────────────┘ encoding_name Specifies a codeset name of current locale. Specifies a maximum allowable number of bytes in a mb_cur_max multi-byte character. It is corresponding to MB_CUR_MAX of "ISO/IEC 9899:1990 C Language Standard". state_depend_encoding Indicates a current locale is state dependent. The value should be specified "True" or "False". Specifies a bit-mask for parsing wide-char string. Each wc_encoding_mask wide character is applied bit-and operation with this bit-mask, then is classified into the unique charset, by using 'wc_encoding'. Specifies a number of bit to be shifted for converting wc_shift_bits from a multi-byte character to a wide character, and vice-versa. Includes a character set information for Nth charset, where N is the index number (0,1,2,...). If there are 4 csN charsets available in current locale, cs0, cs1, cs2 and cs3 should be defined. This class has five subclasses, 'side', 'length', 'mb_encoding' 'wc_encoding' and 'ct_encoding'. Specifies a mapping side of this charset. The format of this value is; side    Side    ::=  EncodingSide[":Default"]        The suffix ":Default" can be specified. It indicates that a character belongs to the specified side is mapped to this charset in initial state. Specifies a number of bytes of a multi-byte character of length this charset. It should not contain the length of any single-shift sequence. Specifies a list of shift sequence for parsing multi-byte string. The format of this value is; MBEncoding ::= ShiftType ShiftSequence   | ShiftType ShiftSequence ";" MBEncoding ShiftType ::= ""|""|"" mb_encoding ShiftSequence ::= SequenceValue|SequenceValue ShiftSequence SequenceValue ::= NumericString example:       \x1b \x28 \x4a;  \x1b \x28 \x42        Specifies an integer value for parsing wide-char string. It is used to determine the charset for each wide wc_encoding character, after applying bit-and operation using 'wc_encoding_mask'. This value should be unique in all csN classes. ct_encoding Specifies a list of encoding information that can be used for Compound Text. Sample of X Locale Database The following is sample X Locale Database file. # XLocale Database Sample for ja_JP.euc # # # XLC_FONTSET category # XLC_FONTSET # fs0 class (7 bit ASCII) fs0 { charset ISO8859-1:GL font ISO8859-1:GL; JISX0201.1976-0:GL } # fs1 class (Kanji) fs1 { charset JISX0208.1983-0:GL font JISX0208.1983-0:GL } # fs2 class (Half Kana) fs2 { charset JISX0201.1976-0:GR font JISX0201.1976-0:GR } # fs3 class (User Defined Character) # fs3 { # charset JISX0212.1990-0:GL # font JISX0212.1990-0:GL # } END XLC_FONTSET # # XLC_XLOCALE category # XLC_XLOCALE encoding_name ja.euc mb_cur_max 3 state_depend_encoding False wc_encoding_mask \x00008080 wc_shift_bits 8 # cs0 class cs0 { side GL:Default length 1 wc_encoding \x00000000 ct_encoding ISO8859-1:GL; JISX0201.1976-0:GL } # cs1 class cs1 { side GR:Default length 2 wc_encoding \x00008080 ct_encoding JISX0208.1983-0:GL; JISX0208.1983-0:GR;\ JISX0208.1983-1:GL; JISX0208.1983-1:GR } # cs2 class cs2 { side GR length 1 mb_encoding \x8e wc_encoding \x00000080 ct_encoding JISX0201.1976-0:GR } # cs3 class # cs3 { # side GL # length 2 # mb_encoding \x8f # #if HasWChar32 # wc_encoding \x20000000 # #else # wc_encoding \x00008000 # #endif # ct_encoding JISX0212.1990-0:GL; JISX0212.1990-0:GR # } END XLC_XLOCALE Reference [1] ISO/IEC 9899:1990 C Language Standard [2] X Logical Font Description Conventions