547 lines
19 KiB
C
547 lines
19 KiB
C
/* Header for charset handler.
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Copyright (C) 2001-2022 Free Software Foundation, Inc.
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Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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2005, 2006, 2007, 2008, 2009, 2010, 2011
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National Institute of Advanced Industrial Science and Technology (AIST)
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Registration Number H14PRO021
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Copyright (C) 2003
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National Institute of Advanced Industrial Science and Technology (AIST)
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Registration Number H13PRO009
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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 3 of the License, or (at
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your option) 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. If not, see <https://www.gnu.org/licenses/>. */
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#ifndef EMACS_CHARSET_H
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#define EMACS_CHARSET_H
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#include <verify.h>
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#include "lisp.h"
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INLINE_HEADER_BEGIN
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/* Index to arguments of Fdefine_charset_internal. */
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enum define_charset_arg_index
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{
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charset_arg_name,
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charset_arg_dimension,
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charset_arg_code_space,
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charset_arg_min_code,
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charset_arg_max_code,
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charset_arg_iso_final,
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charset_arg_iso_revision,
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charset_arg_emacs_mule_id,
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charset_arg_ascii_compatible_p,
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charset_arg_supplementary_p,
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charset_arg_invalid_code,
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charset_arg_code_offset,
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charset_arg_map,
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charset_arg_subset,
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charset_arg_superset,
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charset_arg_unify_map,
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charset_arg_plist,
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charset_arg_max
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};
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/* Indices to charset attributes vector. */
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enum charset_attr_index
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{
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/* ID number of the charset. */
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charset_id,
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/* Name of the charset (symbol). */
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charset_name,
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/* Property list of the charset. */
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charset_plist,
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/* If the method of the charset is `MAP', the value is a mapping
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vector or a file name that contains mapping vector. Otherwise,
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nil. */
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charset_map,
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/* If the method of the charset is `MAP', the value is a vector
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that maps code points of the charset to characters. The vector
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is indexed by a character index. A character index is
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calculated from a code point and the code-space table of the
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charset. */
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charset_decoder,
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/* If the method of the charset is `MAP', the value is a
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char-table that maps characters of the charset to code
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points. */
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charset_encoder,
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/* If the method of the charset is `SUBSET', the value is a vector
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that has this form:
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[ CHARSET-ID MIN-CODE MAX-CODE OFFSET ]
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CHARSET-ID is an ID number of a parent charset. MIN-CODE and
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MAX-CODE specify the range of characters inherited from the
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parent. OFFSET is an integer value to add to a code point of
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the parent charset to get the corresponding code point of this
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charset. */
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charset_subset,
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/* If the method of the charset is `SUPERSET', the value is a list
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whose elements have this form:
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(CHARSET-ID . OFFSET)
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CHARSET-IDs are ID numbers of parent charsets. OFFSET is an
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integer value to add to a code point of the parent charset to
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get the corresponding code point of this charset. */
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charset_superset,
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/* The value is a mapping vector or a file name that contains the
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mapping. This defines how characters in the charset should be
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unified with Unicode. The value of the member
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`charset_deunifier' is created from this information. */
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charset_unify_map,
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/* If characters in the charset must be unified Unicode, the value
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is a char table that maps a unified Unicode character code to
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the non-unified character code in the charset. */
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charset_deunifier,
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/* The length of the charset attribute vector. */
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charset_attr_max
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};
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/* Methods for converting code points and characters of charsets. */
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enum charset_method
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{
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/* For a charset of this method, a character code is calculated
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from a character index (which is calculated from a code point)
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simply by adding an offset value. */
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CHARSET_METHOD_OFFSET,
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/* For a charset of this method, a decoder vector and an encoder
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char-table is used for code point <-> character code
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conversion. */
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CHARSET_METHOD_MAP,
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/* A charset of this method is a subset of another charset. */
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CHARSET_METHOD_SUBSET,
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/* A charset of this method is a superset of other charsets. */
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CHARSET_METHOD_SUPERSET
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};
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struct charset
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{
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/* Index to charset_table. */
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int id;
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/* Index to Vcharset_hash_table. */
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ptrdiff_t hash_index;
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/* Dimension of the charset: 1, 2, 3, or 4. */
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int dimension;
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/* Byte code range of each dimension. <code_space>[4N] is a minimum
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byte code of the (N+1)th dimension, <code_space>[4N+1] is a
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maximum byte code of the (N+1)th dimension, <code_space>[4N+2] is
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(<code_space>[4N+1] - <code_space>[4N] + 1), <code_space>[4N+3]
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is the number of characters contained in the first through (N+1)th
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dimensions, except that there is no <code_space>[15].
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We get `char-index' of a `code-point' from this
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information. */
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int code_space[15];
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/* If B is a byte of Nth dimension of a code-point, the (N-1)th bit
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of code_space_mask[B] is set. This array is used to quickly
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check if a code-point is in a valid range. */
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unsigned char *code_space_mask;
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/* True if there's no gap in code-points. */
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bool_bf code_linear_p : 1;
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/* True if the charset is treated as 96 chars in ISO-2022
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as opposed to 94 chars. */
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bool_bf iso_chars_96 : 1;
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/* True if the charset is compatible with ASCII. */
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bool_bf ascii_compatible_p : 1;
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/* True if the charset is supplementary. */
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bool_bf supplementary_p : 1;
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/* True if all the code points are representable by Lisp_Int. */
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bool_bf compact_codes_p : 1;
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/* True if the charset is unified with Unicode. */
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bool_bf unified_p : 1;
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/* ISO final byte of the charset: 48..127. It may be -1 if the
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charset doesn't conform to ISO-2022. */
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int iso_final;
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/* ISO revision number of the charset. */
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int iso_revision;
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/* If the charset is identical to what supported by Emacs 21 and the
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priors, the identification number of the charset used in those
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version. Otherwise, -1. */
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int emacs_mule_id;
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/* The method for encoding/decoding characters of the charset. */
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enum charset_method method;
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/* Minimum and Maximum code points of the charset. */
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unsigned min_code, max_code;
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/* Offset value used by macros CODE_POINT_TO_INDEX and
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INDEX_TO_CODE_POINT. */
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unsigned char_index_offset;
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/* Minimum and Maximum character codes of the charset. If the
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charset is compatible with ASCII, min_char is a minimum non-ASCII
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character of the charset. If the method of charset is
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CHARSET_METHOD_OFFSET, even if the charset is unified, min_char
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and max_char doesn't change. */
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int min_char, max_char;
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/* The code returned by ENCODE_CHAR if a character is not encodable
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by the charset. */
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unsigned invalid_code;
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/* If the method of the charset is CHARSET_METHOD_MAP, this is a
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table of bits used to quickly and roughly guess if a character
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belongs to the charset.
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The first 64 elements are 512 bits for characters less than
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0x10000. Each bit corresponds to 128-character block. The last
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126 elements are 1008 bits for the greater characters
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(0x10000..0x3FFFFF). Each bit corresponds to 4096-character
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block.
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If a bit is 1, at least one character in the corresponding block is
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in this charset. */
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unsigned char fast_map[190];
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/* Offset value to calculate a character code from code-point, and
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visa versa. */
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int code_offset;
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};
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/* Hash table of charset symbols vs. the corresponding attribute
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vectors. */
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extern Lisp_Object Vcharset_hash_table;
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/* Table of struct charset. */
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extern struct charset *charset_table;
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extern int charset_table_size;
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extern int charset_table_used;
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#define CHARSET_FROM_ID(id) (charset_table + (id))
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extern Lisp_Object Vcharset_ordered_list;
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extern Lisp_Object Vcharset_non_preferred_head;
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extern EMACS_UINT charset_ordered_list_tick;
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extern Lisp_Object Viso_2022_charset_list;
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extern Lisp_Object Vemacs_mule_charset_list;
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extern int emacs_mule_charset[256];
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/* Macros to access information about charset. */
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/* Return the attribute vector of charset whose symbol is SYMBOL. */
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#define CHARSET_SYMBOL_ATTRIBUTES(symbol) \
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Fgethash ((symbol), Vcharset_hash_table, Qnil)
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#define CHARSET_ATTR_ID(attrs) AREF ((attrs), charset_id)
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#define CHARSET_ATTR_NAME(attrs) AREF ((attrs), charset_name)
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#define CHARSET_ATTR_PLIST(attrs) AREF ((attrs), charset_plist)
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#define CHARSET_ATTR_MAP(attrs) AREF ((attrs), charset_map)
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#define CHARSET_ATTR_DECODER(attrs) AREF ((attrs), charset_decoder)
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#define CHARSET_ATTR_ENCODER(attrs) AREF ((attrs), charset_encoder)
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#define CHARSET_ATTR_SUBSET(attrs) AREF ((attrs), charset_subset)
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#define CHARSET_ATTR_SUPERSET(attrs) AREF ((attrs), charset_superset)
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#define CHARSET_ATTR_UNIFY_MAP(attrs) AREF ((attrs), charset_unify_map)
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#define CHARSET_ATTR_DEUNIFIER(attrs) AREF ((attrs), charset_deunifier)
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#define CHARSET_SYMBOL_ID(symbol) \
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CHARSET_ATTR_ID (CHARSET_SYMBOL_ATTRIBUTES (symbol))
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/* Return an index to Vcharset_hash_table of the charset whose symbol
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is SYMBOL. */
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#define CHARSET_SYMBOL_HASH_INDEX(symbol) \
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hash_lookup (XHASH_TABLE (Vcharset_hash_table), symbol, NULL)
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/* Return the attribute vector of CHARSET. */
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#define CHARSET_ATTRIBUTES(charset) \
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(HASH_VALUE (XHASH_TABLE (Vcharset_hash_table), (charset)->hash_index))
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#define CHARSET_ID(charset) ((charset)->id)
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#define CHARSET_HASH_INDEX(charset) ((charset)->hash_index)
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#define CHARSET_DIMENSION(charset) ((charset)->dimension)
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#define CHARSET_CODE_SPACE(charset) ((charset)->code_space)
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#define CHARSET_CODE_LINEAR_P(charset) ((charset)->code_linear_p)
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#define CHARSET_ISO_CHARS_96(charset) ((charset)->iso_chars_96)
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#define CHARSET_ISO_FINAL(charset) ((charset)->iso_final)
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#define CHARSET_ISO_PLANE(charset) ((charset)->iso_plane)
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#define CHARSET_ISO_REVISION(charset) ((charset)->iso_revision)
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#define CHARSET_EMACS_MULE_ID(charset) ((charset)->emacs_mule_id)
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#define CHARSET_ASCII_COMPATIBLE_P(charset) ((charset)->ascii_compatible_p)
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#define CHARSET_COMPACT_CODES_P(charset) ((charset)->compact_codes_p)
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#define CHARSET_METHOD(charset) ((charset)->method)
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#define CHARSET_MIN_CODE(charset) ((charset)->min_code)
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#define CHARSET_MAX_CODE(charset) ((charset)->max_code)
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#define CHARSET_INVALID_CODE(charset) ((charset)->invalid_code)
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#define CHARSET_MIN_CHAR(charset) ((charset)->min_char)
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#define CHARSET_MAX_CHAR(charset) ((charset)->max_char)
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#define CHARSET_CODE_OFFSET(charset) ((charset)->code_offset)
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#define CHARSET_UNIFIED_P(charset) ((charset)->unified_p)
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#define CHARSET_NAME(charset) \
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(CHARSET_ATTR_NAME (CHARSET_ATTRIBUTES (charset)))
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#define CHARSET_MAP(charset) \
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(CHARSET_ATTR_MAP (CHARSET_ATTRIBUTES (charset)))
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#define CHARSET_DECODER(charset) \
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(CHARSET_ATTR_DECODER (CHARSET_ATTRIBUTES (charset)))
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#define CHARSET_ENCODER(charset) \
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(CHARSET_ATTR_ENCODER (CHARSET_ATTRIBUTES (charset)))
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#define CHARSET_SUBSET(charset) \
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(CHARSET_ATTR_SUBSET (CHARSET_ATTRIBUTES (charset)))
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#define CHARSET_SUPERSET(charset) \
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(CHARSET_ATTR_SUPERSET (CHARSET_ATTRIBUTES (charset)))
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#define CHARSET_UNIFY_MAP(charset) \
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(CHARSET_ATTR_UNIFY_MAP (CHARSET_ATTRIBUTES (charset)))
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#define CHARSET_DEUNIFIER(charset) \
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(CHARSET_ATTR_DEUNIFIER (CHARSET_ATTRIBUTES (charset)))
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INLINE void
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set_charset_attr (struct charset *charset, enum charset_attr_index idx,
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Lisp_Object val)
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{
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ASET (CHARSET_ATTRIBUTES (charset), idx, val);
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}
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/* Nonzero if OBJ is a valid charset symbol. */
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#define CHARSETP(obj) (CHARSET_SYMBOL_HASH_INDEX (obj) >= 0)
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/* Check if X is a valid charset symbol. If not, signal an error. */
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#define CHECK_CHARSET(x) \
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do { \
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if (! SYMBOLP (x) || CHARSET_SYMBOL_HASH_INDEX (x) < 0) \
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wrong_type_argument (Qcharsetp, (x)); \
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} while (false)
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/* Check if X is a valid charset symbol. If valid, set ID to the id
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number of the charset. Otherwise, signal an error. */
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#define CHECK_CHARSET_GET_ID(x, id) \
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do { \
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ptrdiff_t idx; \
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\
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if (! SYMBOLP (x) || (idx = CHARSET_SYMBOL_HASH_INDEX (x)) < 0) \
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wrong_type_argument (Qcharsetp, (x)); \
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id = XFIXNUM (AREF (HASH_VALUE (XHASH_TABLE (Vcharset_hash_table), idx), \
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charset_id)); \
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} while (false)
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/* Check if X is a valid charset symbol. If valid, set ATTR to the
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attr vector of the charset. Otherwise, signal an error. */
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#define CHECK_CHARSET_GET_ATTR(x, attr) \
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do { \
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if (!SYMBOLP (x) || NILP (attr = CHARSET_SYMBOL_ATTRIBUTES (x))) \
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wrong_type_argument (Qcharsetp, (x)); \
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} while (false)
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#define CHECK_CHARSET_GET_CHARSET(x, charset) \
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do { \
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int csid; \
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CHECK_CHARSET_GET_ID (x, csid); \
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charset = CHARSET_FROM_ID (csid); \
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} while (false)
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/* Lookup Vcharset_ordered_list and return the first charset that
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contains the character C. */
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#define CHAR_CHARSET(c) \
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((c) < 0x80 ? CHARSET_FROM_ID (charset_ascii) \
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: char_charset ((c), Qnil, NULL))
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#if false
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/* Char-table of charset-sets. Each element is a bool vector indexed
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by a charset ID. */
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extern Lisp_Object Vchar_charset_set;
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/* Charset-bag of character C. */
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#define CHAR_CHARSET_SET(c) \
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CHAR_TABLE_REF (Vchar_charset_set, c)
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/* Check if two characters C1 and C2 belong to the same charset. */
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#define SAME_CHARSET_P(c1, c2) \
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intersection_p (CHAR_CHARSET_SET (c1), CHAR_CHARSET_SET (c2))
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#endif
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/* Return a character corresponding to the code-point CODE of CHARSET.
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Try some optimization before calling decode_char. */
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#define DECODE_CHAR(charset, code) \
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((ASCII_CHAR_P (code) && (charset)->ascii_compatible_p) \
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? (code) \
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: ((code) < (charset)->min_code || (code) > (charset)->max_code) \
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? -1 \
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: (charset)->unified_p \
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? decode_char ((charset), (code)) \
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: (charset)->method == CHARSET_METHOD_OFFSET \
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? ((charset)->code_linear_p \
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? (int) ((code) - (charset)->min_code) + (charset)->code_offset \
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: decode_char ((charset), (code))) \
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: (charset)->method == CHARSET_METHOD_MAP \
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? (((charset)->code_linear_p \
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&& VECTORP (CHARSET_DECODER (charset))) \
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? XFIXNUM (AREF (CHARSET_DECODER (charset), \
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(code) - (charset)->min_code)) \
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: decode_char ((charset), (code))) \
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: decode_char ((charset), (code)))
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extern Lisp_Object charset_work;
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/* Return a code point of CHAR in CHARSET.
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Try some optimization before calling encode_char. */
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#define ENCODE_CHAR(charset, c) \
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(verify_expr \
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(sizeof (c) <= sizeof (int), \
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(ASCII_CHAR_P (c) && (charset)->ascii_compatible_p \
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? (unsigned) (c) \
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: ((charset)->unified_p \
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|| (charset)->method == CHARSET_METHOD_SUBSET \
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|| (charset)->method == CHARSET_METHOD_SUPERSET) \
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? encode_char (charset, c) \
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: (c) < (charset)->min_char || (c) > (charset)->max_char \
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? (charset)->invalid_code \
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: (charset)->method == CHARSET_METHOD_OFFSET \
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? ((charset)->code_linear_p \
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? (unsigned) ((c) - (charset)->code_offset) + (charset)->min_code \
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: encode_char (charset, c)) \
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: (charset)->method == CHARSET_METHOD_MAP \
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? (((charset)->compact_codes_p \
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&& CHAR_TABLE_P (CHARSET_ENCODER (charset))) \
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? (charset_work = CHAR_TABLE_REF (CHARSET_ENCODER (charset), c), \
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(NILP (charset_work) \
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? (charset)->invalid_code \
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: (unsigned) XFIXNAT (charset_work))) \
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: encode_char (charset, c)) \
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: encode_char (charset, c))))
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/* Set to true when a charset map is loaded to warn that a buffer text
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and a string data may be relocated. */
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extern bool charset_map_loaded;
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/* Set CHARSET to the charset highest priority of C, CODE to the
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code-point of C in CHARSET. */
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#define SPLIT_CHAR(c, charset, code) \
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((charset) = char_charset ((c), Qnil, &(code)))
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#define ISO_MAX_DIMENSION 3
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#define ISO_MAX_CHARS 2
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#define ISO_MAX_FINAL 0x80 /* only 0x30..0xFF are used */
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/* Mapping table from ISO2022's charset (specified by DIMENSION,
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CHARS, and FINAL_CHAR) to Emacs' charset ID. Should be accessed by
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macro ISO_CHARSET_TABLE (DIMENSION, CHARS, FINAL_CHAR). */
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extern int iso_charset_table[ISO_MAX_DIMENSION][ISO_MAX_CHARS][ISO_MAX_FINAL];
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|
||
/* A charset of type iso2022 who has DIMENSION, CHARS_96, and FINAL
|
||
(final character). */
|
||
#define ISO_CHARSET_TABLE(dimension, chars_96, final) \
|
||
iso_charset_table[(dimension) - 1][chars_96][final]
|
||
|
||
/* Nonzero if the charset who has FAST_MAP may contain C. */
|
||
#define CHARSET_FAST_MAP_REF(c, fast_map) \
|
||
((c) < 0x10000 \
|
||
? fast_map[(c) >> 10] & (1 << (((c) >> 7) & 7)) \
|
||
: fast_map[((c) >> 15) + 62] & (1 << (((c) >> 12) & 7)))
|
||
|
||
#define CHARSET_FAST_MAP_SET(c, fast_map) \
|
||
do { \
|
||
if ((c) < 0x10000) \
|
||
(fast_map)[(c) >> 10] |= 1 << (((c) >> 7) & 7); \
|
||
else \
|
||
(fast_map)[((c) >> 15) + 62] |= 1 << (((c) >> 12) & 7); \
|
||
} while (false)
|
||
|
||
|
||
|
||
/* True if CHARSET may contain the character C. */
|
||
#define CHAR_CHARSET_P(c, charset) \
|
||
((ASCII_CHAR_P (c) && (charset)->ascii_compatible_p) \
|
||
|| ((CHARSET_UNIFIED_P (charset) \
|
||
|| (charset)->method == CHARSET_METHOD_SUBSET \
|
||
|| (charset)->method == CHARSET_METHOD_SUPERSET) \
|
||
? encode_char ((charset), (c)) != (charset)->invalid_code \
|
||
: (CHARSET_FAST_MAP_REF ((c), (charset)->fast_map) \
|
||
&& ((charset)->method == CHARSET_METHOD_OFFSET \
|
||
? (c) >= (charset)->min_char && (c) <= (charset)->max_char \
|
||
: ((charset)->method == CHARSET_METHOD_MAP \
|
||
&& (charset)->compact_codes_p \
|
||
&& CHAR_TABLE_P (CHARSET_ENCODER (charset))) \
|
||
? ! NILP (CHAR_TABLE_REF (CHARSET_ENCODER (charset), (c))) \
|
||
: encode_char ((charset), (c)) != (charset)->invalid_code))))
|
||
|
||
|
||
/* Special macros for emacs-mule encoding. */
|
||
|
||
/* Leading-code followed by extended leading-code. DIMENSION/COLUMN */
|
||
#define EMACS_MULE_LEADING_CODE_PRIVATE_11 0x9A /* 1/1 */
|
||
#define EMACS_MULE_LEADING_CODE_PRIVATE_12 0x9B /* 1/2 */
|
||
#define EMACS_MULE_LEADING_CODE_PRIVATE_21 0x9C /* 2/2 */
|
||
#define EMACS_MULE_LEADING_CODE_PRIVATE_22 0x9D /* 2/2 */
|
||
|
||
|
||
|
||
extern int charset_ascii, charset_eight_bit;
|
||
extern int charset_unicode;
|
||
extern int charset_jisx0201_roman;
|
||
extern int charset_jisx0208_1978;
|
||
extern int charset_jisx0208;
|
||
extern int charset_ksc5601;
|
||
|
||
extern int charset_unibyte;
|
||
|
||
extern struct charset *char_charset (int, Lisp_Object, unsigned *);
|
||
extern Lisp_Object charset_attributes (int);
|
||
|
||
extern int decode_char (struct charset *, unsigned);
|
||
extern unsigned encode_char (struct charset *, int);
|
||
extern int string_xstring_p (Lisp_Object);
|
||
|
||
extern void map_charset_chars (void (*) (Lisp_Object, Lisp_Object),
|
||
Lisp_Object, Lisp_Object,
|
||
struct charset *, unsigned, unsigned);
|
||
|
||
INLINE_HEADER_END
|
||
|
||
#endif /* EMACS_CHARSET_H */
|