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Merge into NEWS.
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Glenn Morris
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2008-02-21 Glenn Morris <rgm@gnu.org>
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* NEWS.unicode: Merge into NEWS and remove file.
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2008-02-20 Kenichi Handa <handa@ni.aist.go.jp>
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* NEWS.unicode: Mention the removal of codepage related functions.
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265
etc/NEWS.unicode
265
etc/NEWS.unicode
@ -1,265 +0,0 @@
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GNU Emacs NEWS -- history of user-visible changes.
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Copyright (C) 2007, 2008 Free Software Foundation, Inc.
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Copyright (C) 2007, 2008
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National Institute of Advanced Industrial Science and Technology (AIST)
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Registration Number H14PRO021
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See the end of the file for license conditions.
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This file is about changes in the Emacs "unicode" branch.
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* Changes in Emacs Unicode
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** The Emacs character set is now a superset of Unicode.
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(It has about four times the code space, which should be plenty).
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The internal encoding used for buffers and strings is now
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Unicode-based and called `utf-8-emacs'. utf-8-emacs is backwards
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compatible with the UTF-8 encoding of Unicode. The `emacs-mule'
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coding system can still read and write data in the old internal encoding.
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Since the internal encoding is also used by default for byte-compiled
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files -- i.e. the normal coding system for byte-compiled Lisp files is
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now utf-8-Emacs -- Lisp containing non-ASCII characters which is
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compiled by Emacs 23 can't be read by earlier versions of Emacs. Files
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compiled by Emacs 20, 21, or 22 are loaded correctly as emacs-mule
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(whether or not they contain multibyte characters), which makes loading
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them somewhat slower than Emacs 23-compiled files. Thus it may be worth
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recompiling existing .elc files which don't need to be shared with older
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Emacsen.
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** There are assorted new coding systems/aliases -- see M-x list-coding-systems.
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** New charset implementation with many new charsets.
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See M-x list-character-sets. New charsets can be defined conveniently
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as tables of unicodes.
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The dimension of a charset is now 1, 2, 3, or 4, and the size of each
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dimension is no longer limited to 94 or 96.
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A dynamic charset priority list is used to infer the charset of
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characters for display.
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** New minor mode Auto Composition Mode composes characters automatically
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when they are displayed. This mode is globally on by default.
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** Emacs now supports local fonts (fonts installed in the same machine
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as Emacs is running) by freetype and fontconfig libraries. On X, they
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are derived via Xft library with antialias support. Fontconfig-like
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font names (e.g. monospace-12) are also accepted.
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** New language environments Chinese-GBK, Chinese-GB18030, Khmer,
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TaiViet.
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** The following facilities are obsolete:
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Minor modes: unify-8859-on-encoding-mode, unify-8859-on-decoding-mode
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* Lisp changes in Emacs Unicode
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** Character code, representation, and charset changes.
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Now character code space is 0x0..0x3FFFFF with no gap. Among them,
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characters of code 0x0..0x10FFFF are Unicode characters of the same
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code points. Characters of code 0x3FFF80..0x3FFFFF are raw 8-bit bytes.
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Generic characters no longer exist.
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In buffer and string, characters are represented by UTF-8 byte
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sequence in a multibyte buffer/string.
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The concept of charset is changed. A single character may belong to
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multiple charset (e.g. a-grave (U+00E0) belongs to charsets unicode,
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iso-8859-1, iso-8859-3, and etc).
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*** The new function `characterp' returns t if and only if the argument
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is a character.
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*** The new function `max-char' returns the maximum character code
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(currently it is #x3FFFFF).
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*** The functions `encode-char' and `decode-char' now accept any
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character sets.
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*** The function `define-charset' now accepts a completely different
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form of arguments (old-style arguments still work).
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*** The new function `define-charset-alias' defines an alias of a charset.
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*** The value of the function `char-charset' depends on the current
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priorities of charsets.
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*** The new function `charset-priority-list' returns the list of
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charsets ordered by priority.
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*** The new function `set-charset-priority' sets priorities of charsets.
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*** The new function `unibyte-charset' returns the current unibyte
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charset. The unibyte charset determines how unibyte/multibyte
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conversion is done.
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*** The new function `set-unibyte-charset' sets the unibyte charset.
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*** The new function `unibyte-string' make a unibyte string from bytes.
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** Code conversion changes
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*** The new function `define-coding-system' should be used to define a
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coding system instead of `make-coding-system' (which is obsolete now).
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*** The functions `encode-coding-region' and `decode-coding-region'
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have an optional 4th argument to specify where the result of
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conversion should go.
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*** The functions `encode-coding-string' and `decode-coding-string'
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have an optional 4th argument specifying a buffer to store the result
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of conversion.
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*** The new function `with-coding-priority' executes the body part with
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the specified coding system priority order.
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*** The new function `check-coding-systems-region' checks if the text
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in the region is encodable by the specified coding systems.
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*** The new function `coding-system-aliases' returns a list of aliases
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of a coding system.
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*** The new function `coding-system-charset-list' returns a list of
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charsets supported by a coding system.
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*** The new function `coding-system-priority-list' returns a list of
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coding systems ordered by their priorities.
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*** Thew new function `set-coding-system-priority' sets priorities of
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coding systems.
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** Composition changes
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*** New functions and variables `auto-composition-mode' and
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`global-auto-composition-mode' toggles the new minor mode Auto
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Composition Mode locally and globally.
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*** New variable `auto-composition-function' is a function used in
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Auto Composition Mode to compose characters. The default value is the
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function `auto-compose-chars'.
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** Font Backend changes.
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*** New frame parameter `font-backend' specifies a list of
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font-backends supported by the frame's graphic device. On X, they are
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currently `x' and `xft'.
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*** New function `fontp' checks if the argument is a font-spec
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or font-entity.
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*** New function `font-spec' creates a new font-spec object.
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*** New function `font-get' returns a font property value.
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*** New function `font-put' sets a font property value.
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*** New function `list-fonts' returns a list of font-entities matching
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the given specification.
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*** New function `list-families' returns a list of family names of
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available fonts.
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*** New function `font-font' returns a font-entity best matching with
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the given specification.
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*** New function `font-xlfd-name' returns an XLFD name of a given font
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(font-spec, font-entity, or font-object).
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*** New function `clear-font-cache' clears all font caches.
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** The function get-char-code-property now accepts many Unicode base
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character properties. They are `name', `general-category',
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`canonical-combining-class', `bidi-class', `decomposition',
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`decimal-digit-value', `digit-value', `numeric-value', `mirrored',
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`old-name', `iso-10646-comment', `uppercase', `lowercase', and
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`titlecase'.
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** The new function `define-char-code-property' defines a character
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code property.
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** The new function `char-code-property-description' returns the
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description string of a character code property.
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*** The new variable `find-word-boundary-function-table' is a
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char-table of functions to search for a word boundary.
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*** The new variable `char-script-table' is a char-table of script names.
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*** The new variable `char-width-table' is a char-table of character widths.
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*** The new variable `print-charset-text-property' controls how to
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handle `charset' text property on printing a string.
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*** The new variable `printable-chars' is a char-table defining if a
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character is printable or not.
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*** The new function `robin-define-package' defines a Robin package,
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which is an input method system different from Quail.
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*** The new function `robin-modify-package' modifies an existing Robin package.
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*** The new function `robin-use-package' start using a Robin package
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as an input method.
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** The functions `modify-syntax-entry' and `modify-category-entry' now
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accepts a cons of characters as the first argument, and modify all
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entries in that range of characters.
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** The function `set-fontset-font' now accepts a script name as the
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second argument, and has an optional 5th argument to control how to
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set the font.
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** The functions `char-bytes', `chars-in-region', `set-coding-priority',
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`make-coding-system', and `char-valid-p' are now obsolete.
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* Incompatible Lisp changes
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** The behavior of map-char-table has changed. It may call the
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specified function with a cons (FROM . TO) as a key if characters in
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that range have the same value.
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** The value of the function `charset-id' is now always 0.
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** The functions `register-char-codings' and `coding-system-spec' are deleted.
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** Many codepage related functions are removed. They are:
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cp-make-coding-systems-for-codepage, cp-charset-for-codepage,
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cp-language-for-codepage, cp-offset-for-codepage,
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cp-supported-codepages
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You don't need them anymore because coding systems created by these
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functions are supported from the start now.
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----------------------------------------------------------------------
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This file is part of GNU Emacs.
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GNU Emacs is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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Local variables:
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mode: outline
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paragraph-separate: "[ ]*$"
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end:
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arch-tag: e21801b9-0724-4cda-8c07-7d60bf3db3fd
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