Unicode NamesList File Format

Revision	5.0.0
Authors	Asmus Freytag
Date	2006-7-13
This Version	http://www.unicode.org/Public/5.0.0/ucd/NamesList.html
Previous Version	http://www.unicode.org/Public/4.1.0/ucd/NamesList.html
Latest Version	http://www.unicode.org/Public/UNIDATA/NamesList.html

Summary

This file describes the format and contents of NamesList.txt

Status

The file and the files described herein are part of the Unicode Character Database (UCD) and are governed by the UCD Terms of Use stated at the end.

1.0 Introduction

The Unicode name list file NamesList.txt (also NamesList.lst) is a plain text file used to drive the layout of the character code charts in the Unicode Standard. The information in this file is a combination of several fields from the UnicodeData.txt and Blocks.txt files, together with additional annotations for many characters.

This document describes the syntax rules for the file format, but also gives brief information on how each construct is rendered when laid out for the book. Some of the syntax elements were used in preparation of the drafts of the book and may not be present in the final, released form of the NamesList.txt file.

The syntax for formal aliases and index tabs was introduced with Unicode 5.0.

The same input file can be used to do the draft preparation for ISO/IEC 10646 (referred below as ISO-style). This necessitates the presence of some information in the name list file that is not needed (and in fact removed during parsing) for the Unicode code charts.

With access to the layout program (unibook.exe) it is a simple matter of creating name lists for the purpose of formatting working drafts containing proposed characters.

The content of the NamesList.txt file is optimized for code chart creation. Some information that can be inferred by the reader from context has been suppressed to make the code charts more readable.

1.1 NamesList File Overview

The namelist files are plain text files which in their most simple form look like this

@@<tab>0020<tab>BASIC LATIN<tab>007F
; this is a file comment (ignored)
0020<tab>SPACE
0021<tab>EXCLAMATION MARK
0022<tab>QUOTATION MARK
. . .
007F<tab>DELETE

The semicolon (as first character), @ and <tab> characters are used by the file syntax and must be provided as shown. Hexadecimal digits must be in UPPER CASE. A double @@ introduces a block header, with the title, and start and ending code of the block provided as shown.

For an ISO-style, minimal name list, only the NAME_LINE and BLOCKHEADER and their constituent syntax elements are needed.

The full syntax with all the options is provided in the following sections.

1.2 NamesList File Structure

This section defines the overall file structure

NAMELIST:     TITLE_PAGE* BLOCK* 

TITLE_PAGE:   TITLE 
		| TITLE_PAGE SUBTITLE 
		| TITLE_PAGE SUBHEADER 
		| TITLE_PAGE IGNORED_LINE 
		| TITLE_PAGE EMPTY_LINE
		| TITLE_PAGE COMMENT_LINE
		| TITLE_PAGE NOTICE_LINE
		| TITLE_PAGE PAGEBREAK 

BLOCK:	      BLOCKHEADER 
		| BLOCKHEADER INDEX_TAB 
		| BLOCK CHAR_ENTRY 
		| BLOCK SUBHEADER 
		| BLOCK NOTICE_LINE 
		| BLOCK EMPTY_LINE 
		| BLOCK IGNORED_LINE
		| BLOCK PAGEBREAK

CHAR_ENTRY:   NAME_LINE | RESERVED_LINE
		| CHAR_ENTRY ALIAS_LINE
		| CHAR_ENTRY FORMALALIAS_LINE
		| CHAR_ENTRY COMMENT_LINE
		| CHAR_ENTRY CROSS_REF
		| CHAR_ENTRY DECOMPOSITION
		| CHAR_ENTRY COMPAT_MAPPING
		| CHAR_ENTRY IGNORED_LINE
		| CHAR_ENTRY EMPTY_LINE
		| CHAR_ENTRY NOTICE_LINE

In other words:

Neither TITLE nor SUBTITLE may occur after the first BLOCKHEADER.

Only TITLE, SUBTITLE, SUBHEADER, PAGEBREAK, COMMENT_LINE, NOTICE_LINE, EMPTY_LINE and IGNORED_LINE may occur before the first BLOCKHEADER.

Directly following either a NAME_LINE or a RESERVED_LINE an uninterrupted sequence of the following lines may occur (in any order and repeated as often as needed): ALIAS_LINE, CROSS_REF, DECOMPOSITION, COMPAT_MAPPING, NOTICE_LINE, EMPTY_LINE and IGNORED_LINE.

Except for EMPTY_LINE, NOTICE_LINE and IGNORED_LINE, none of these lines may occur in any other place.

A PAGEBREAK may appear anywhere, except the middle of a CHARACTER_ENTRY. A PAGEBREAK before the file title lines may not be supported. INDEX_TABs may appear after any block header.

Note: A NOTICE_LINE displays differently depending on whether it follows a header or title or is part of a CHAR_ENTRY.

1.3 NamesList File Elements

This section provides the details of the syntax for the individual elements.

ELEMENT		SYNTAX	// How rendered
  
NAME_LINE:	CHAR <tab> NAME LF
			// the CHAR and the corresponding image are echoed, 
			// followed by the name as given in LINE

		CHAR TAB "<" LCNAME ">" LF
			// control and non-characters use this form of									
			// lower case, bracketed pseudo character name

		CHAR TAB NAME COMMENT LF
			// Names may have a comment, which is stripped off
			// unless the file is parsed for an ISO style list
										
RESERVED_LINE:	CHAR TAB <reserved>		
			// the CHAR is echoed followed by an icon for the
			// reserved character and a fixed string e.g. <reserved>
	
COMMMENT_LINE:	<tab> "*" SP EXPAND_LINE
			// * is replaced by BULLET, output line as comment
		<tab> EXPAND_LINE	
			// output line as comment

ALIAS_LINE:	<tab> "=" SP LINE	
			// replace = by itself, output line as alias

FORMALALIAS_LINE:	<tab> "%" SP LINE		
			// replace % by U+225D, output line as formal alias

CROSS_REF:	<tab> "X" SP EXPAND_LINE	
			// X is replaced by a right arrow
		<tab> "X" SP "(" LCNAME SP "-" SP CHAR ")"	
			// X is replaced by a right arrow
			// the "(", "-", ")" are removed, the
			// order of CHAR and STRING is reversed
			// i.e. both inputs result in the same output

FILE_COMMENT:	";" LINE
IGNORED_LINE:	<tab> ";" EXPAND_LINE
EMPTY_LINE:	LF			
			// empty and ignored lines as well as 
			// file comments are ignored

DECOMPOSITION:	<tab> ":" EXPAND_LINE	
			// replace ':' by EQUIV, expand line into 
			// decomposition 

COMPAT_MAPPING:	<tab> "#" SP EXPAND_LINE	
			// replace '#' by APPROX, output line as mapping 

NOTICE_LINE:	"@+" <tab> LINE		
			// skip '@+', output text as notice
		"@+" <tab> * SP LINE	
			// skip '@+', output text as notice
			// "*" expands to a bullet character
			// Notices following a character code apply to the
			// character and are indented. Notices not following
			// a character code apply to the page/block/column 
			// and are italicized, but not indented

SUBTITLE:		"@@@+" <tab> LINE	
			// skip "@@@+", output text as subtitle

SUBHEADER:	"@" <tab> LINE	
			// skip '@', output line as text as column header

BLOCKHEADER:	"@@" <tab> BLOCKSTART <tab> BLOCKNAME <tab> BLOCKEND
			// skip "@@", cause a page break and optional
			// blank page, then output one or more charts
			// followed by the list of character names. 
			// use BLOCKSTART and BLOCKEND to define the 
			// characters belonging to a block
			// use blockname in page and table headers

BLOCKNAME:	LABEL
		LABEL SP "(" LABEL ")"			
			// if an alternate label is present it replaces 
			// the blockname when an ISO-style namelist is
			// laid out; it is ignored in the Unicode charts

BLOCKSTART:	CHAR	// first character position in block
BLOCKEND:		CHAR	// last character position in block
PAGE_BREAK:	"@@"	// insert a column break
INDEX_TAB:	"@@+"	// start a new index tab at latest BLOCKSTART

TITLE:		"@@@" <tab> LINE	
			// skip "@@@", output line as text
			// Title is used in page headers

EXPAND_LINE:	{CHAR | STRING}+ LF	
			// all instances of CHAR *) are replaced by 
			// CHAR NBSP x NBSP where x is the single Unicode
			// character corresponding to char
			// If character is combining, it is replaced with
			// CHAR NBSP <circ> x NBSP where <circ> is the 
			// dotted circle

Notes:

Blocks must be aligned on 16-code point boundary and contain an integer multiple of 16 code point columns. The exception to that rule is for blocks of ideographs etc. for which no names are listed in the file. Such blocks must end on the actual last character.
Blocks must be non-overlapping and in ascending order. Namelines must be in ascending order and follow the block header for the block to which they belong.
Reserved entries are optional, and will normally be supplied automatically. They are required whenever followed by ALIAS_LINE, COMMENT_LINE, NOTICE_LINE or CROSS_REF
The French version of the nameslist uses French rules, which allow apostrophe and accented letters in character names.

1.4 NamesList File Primitives

The following are the primitives and terminals for the NamesList syntax.

LINE:		STRING LF
COMMENT:		"(" LABEL ")"
		"(" LABEL ")" SP "*"
		"*" 
NAME:	  	<sequence of uppercase ASCII letters, digits and hyphen> 
LCNAME:		<sequence of lowercase ASCII letters, digits and hyphen>
STRING:	  	<sequence of Latin-1 characters, except space and controls> 
LABEL:	  	<sequence of Latin-1 characters, except controls, "(" or ")"> 
CHAR:		X X X X
		| X X X X X
		| X X X X X X
X:	  	"0"|"1"|"2"|"3"|"4"|"5"|"6"|"7"|"8"|"9"|"A"|"B"|"C"|"D"|"E"|"F" 
<tab>:	  	<sequence of one or more ASCII tab characters 0x09>	
SP:	  	<ASCII 0x20>
LF:	  	<any sequence of ASCII 0x0A and 0x0D>

Notes:

Special lookahead logic prevents a 4 digit number for a standard, such as ISO 9999 from being misinterpreted as ISO CHAR. The hyphen in a character range CHAR-CHAR is replaced by an EN DASH on output.
The final LF in the file must be present
A CHAR inside ' or " is expanded, but only its glyph image is printed, the code value is not echoed.
Single and double straight quotes in an EXPAND_LINE are replaced by curly quotes using English rules. Smart apostrophes are supported, but nested quotes are not.
The NamesList.txt file is encoded in Latin-1. While the code chart formatter can accept files in either Latin-1 and little-endian UTF-16, prefixed with a BOM, the character repertoire for running text (anything other than CHAR) is effectively restricted to Latin-1 characters.

Modifications

Version 5.0.0

Added FORMALALIAS_LINE and INDEX_TAB to syntax.
Fixed the list of lines that may appear before a blockheader by adding NOTICE_LINE.
Minor fixes to the wording of several syntax definitions.

Version 4.0.0

Fixed syntax to better reflect restrictions on characters in character and block names.
Better document treatment of comments in block names, plus French name rules.

Version 3.2.0

Fixed several broken links, added a left margin, changed version numbering.

Version 3.1.0 (2)

Use of 4-6 digit hex notation is now supported.

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