Adopt GB18030-2022

This implements the Unicode Technical Committee recommendation around GB18030-2022 in a matter suitable for this standard, taking into account existing practice and the closeness between GBK and gb18030.

In particular, using the text file attached to https://www.unicode.org/L2/L2023/23003r-gb18030-recommendations.pdf this does the following:

1. Merges the first set of 18 mappings, which are bidirectional, directly into index gb18030, replacing existing PUA entries. This ends up impacting GBK and gb18030.
2. The second set of 18 mappings (from PUA to bytes) are encoded as an encoder only table, for both GBK and gb18030.
3. The third set of 18 mappings (from bytes to code points) are ignored, as they are already covered by index gb18030 ranges. (Presumably they are included because the recommendation covers the transition from "Previous Mappings" to "Current Mappings" to "Recommended Mappings", whereas we are going directly from "Previous Mappings" to "Recommended Mappings".)

The reason for changing GBK as well is because Chromium and WebKit have already code in the wild that impacts GBK to some degree (although the encoder only table is excluded for GBK only at the moment, including that would make the most sense compatibility-wise) and no fallout has been recorded. Additionally GBK is already positioned as a rough subset of gb18030 in this standard, with the decoder being shared completely.

Tests: encoding/legacy-mb-schinese has some GB18030-2022 coverage already. The aim is to complete that with web-platform-tests/wpt#48239 and web-platform-tests/wpt#48240.

This supersedes #335. This fixes #27 and fixes #312.

encoding.bs

@@ -832,7 +832,7 @@ specification, excluding <a>index single-byte</a>, which have their own table:
   <td><a href=index-gb18030.txt>index-gb18030.txt</a>
   <td><a href=gb18030.html>index gb18030 visualization</a>
   <td><a href=gb18030-bmp.html>index gb18030 BMP coverage</a>
-  <td>This matches the GB18030-2005 standard for code points encoded as two bytes, except for
+  <td>This matches the GB18030-2022 standard for code points encoded as two bytes, except for
   0xA3 0xA0 which maps to U+3000 to be compatible with deployed content. This index covers the
   CJK Unified Ideographs block of Unicode in its entirety. Entries from that block that are above or
   to the left of (the first) U+3000 in the visualization are in the Unicode order.
@@ -845,7 +845,7 @@ specification, excluding <a>index single-byte</a>, which have their own table:
   <td colspan=3><a href=index-gb18030-ranges.txt>index-gb18030-ranges.txt</a>
   <td>This <a>index</a> works different from all others. Listing all code points would result
   in over a million items whereas they can be represented neatly in 207 ranges combined with trivial
-  limit checks. It therefore only superficially matches the GB18030-2005 standard for code points
+  limit checks. It therefore only superficially matches the GB18030-2022 standard for code points
   encoded as four bytes. See also <a>index gb18030 ranges code point</a> and
   <a>index gb18030 ranges pointer</a> below.
  <tr>
@@ -2434,6 +2434,73 @@ consumers of content generated with <a>GBK</a>'s <a for=/>encoder</a>.
  <li><p>If <a>is GBK</a> is true and <var>code point</var> is
  U+20AC, return byte 0x80.
 
+ <li>
+  <p>If there is a row in the table below whose first column is <var>code point</var>, then return
+  the two bytes on the same row listed in the second column:
+
+  <table>
+   <tr>
+    <th>Code point
+    <th>Bytes
+   <tr>
+    <td>U+E78D
+    <td>0xA6 0xD9
+   <tr>
+    <td>U+E78E
+    <td>0xA6 0xDA
+   <tr>
+    <td>U+E78F
+    <td>0xA6 0xDB
+   <tr>
+    <td>U+E790
+    <td>0xA6 0xDC
+   <tr>
+    <td>U+E791
+    <td>0xA6 0xDD
+   <tr>
+    <td>U+E792
+    <td>0xA6 0xDE
+   <tr>
+    <td>U+E793
+    <td>0xA6 0xDF
+   <tr>
+    <td>U+E794
+    <td>0xA6 0xEC
+   <tr>
+    <td>U+E795
+    <td>0xA6 0xED
+   <tr>
+    <td>U+E796
+    <td>0xA6 0xF3
+   <tr>
+    <td>U+E81E
+    <td>0xFE 0x59
+   <tr>
+    <td>U+E826
+    <td>0xFE 0x61
+   <tr>
+    <td>U+E82B
+    <td>0xFE 0x66
+   <tr>
+    <td>U+E82C
+    <td>0xFE 0x67
+   <tr>
+    <td>U+E832
+    <td>0xFE 0x6D
+   <tr>
+    <td>U+E843
+    <td>0xFE 0x7E
+   <tr>
+    <td>U+E854
+    <td>0xFE 0x90
+   <tr>
+    <td>U+E864
+    <td>0xFE 0xA0
+  </table>
+
+  <p class=note>This asymmetric encoder table is introduced to maximize compatibility with an
+  earlier iteration of <a>index gb18030</a>.
+
  <li><p>Let <var>pointer</var> be the <a>index pointer</a> for
  <var>code point</var> in <a>index gb18030</a>.
 

index-big5.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: 8dfc771062e7be0810919082c2c06baa2236147909e0ecc235b1cb9ad782ac82
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   942	0x43F0	䏰 (<CJK Ideograph Extension A>)
   943	0x4C32	䰲 (<CJK Ideograph Extension A>)

index-euc-kr.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: 1d97134cbf187263585bc8f593ca4196654ed4c7a673f5672eaad4f5d9fdc4ba
-# Date: 2018-01-06
+# Date: 2024-09-18
 
     0	0xAC02	갂 (HANGUL SYLLABLE GAGG)
     1	0xAC03	갃 (HANGUL SYLLABLE GAGS)

index-gb18030-ranges.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: f963aaa1653f630c523e7b04729fb4e4458f35806c45eb5c179445623138f0c0
-# Date: 2018-01-06
+# Date: 2024-09-18
 
      0	0x0080
     36	0x00A5

index-gb18030.txt

@@ -1,8 +1,8 @@
 # For details on index index-gb18030.txt see the Encoding Standard
 # https://encoding.spec.whatwg.org/
 #
-# Identifier: 715f084846f5c6fc9dd31046d0a4d604bd2d88bfe3a22833cea048415e413c70
-# Date: 2018-01-06
+# Identifier: ff1c9a923b5d24f9761b3a2de2c0f07b395f9f6f36519508944de4f0415be81c
+# Date: 2024-09-18
 
     0	0x4E02	丂 (<CJK Ideograph>)
     1	0x4E04	丄 (<CJK Ideograph>)
@@ -7186,13 +7186,13 @@
  7179	0x03C7	χ (GREEK SMALL LETTER CHI)
  7180	0x03C8	ψ (GREEK SMALL LETTER PSI)
  7181	0x03C9	ω (GREEK SMALL LETTER OMEGA)
- 7182	0xE78D	 (<Private Use>)
- 7183	0xE78E	 (<Private Use>)
- 7184	0xE78F	 (<Private Use>)
- 7185	0xE790	 (<Private Use>)
- 7186	0xE791	 (<Private Use>)
- 7187	0xE792	 (<Private Use>)
- 7188	0xE793	 (<Private Use>)
+ 7182	0xFE10	︐ (PRESENTATION FORM FOR VERTICAL COMMA)
+ 7183	0xFE12	︒ (PRESENTATION FORM FOR VERTICAL IDEOGRAPHIC FULL STOP)
+ 7184	0xFE11	︑ (PRESENTATION FORM FOR VERTICAL IDEOGRAPHIC COMMA)
+ 7185	0xFE13	︓ (PRESENTATION FORM FOR VERTICAL COLON)
+ 7186	0xFE14	︔ (PRESENTATION FORM FOR VERTICAL SEMICOLON)
+ 7187	0xFE15	︕ (PRESENTATION FORM FOR VERTICAL EXCLAMATION MARK)
+ 7188	0xFE16	︖ (PRESENTATION FORM FOR VERTICAL QUESTION MARK)
  7189	0xFE35	︵ (PRESENTATION FORM FOR VERTICAL LEFT PARENTHESIS)
  7190	0xFE36	︶ (PRESENTATION FORM FOR VERTICAL RIGHT PARENTHESIS)
  7191	0xFE39	︹ (PRESENTATION FORM FOR VERTICAL LEFT TORTOISE SHELL BRACKET)
@@ -7205,14 +7205,14 @@
  7198	0xFE42	﹂ (PRESENTATION FORM FOR VERTICAL RIGHT CORNER BRACKET)
  7199	0xFE43	﹃ (PRESENTATION FORM FOR VERTICAL LEFT WHITE CORNER BRACKET)
  7200	0xFE44	﹄ (PRESENTATION FORM FOR VERTICAL RIGHT WHITE CORNER BRACKET)
- 7201	0xE794	 (<Private Use>)
- 7202	0xE795	 (<Private Use>)
+ 7201	0xFE17	︗ (PRESENTATION FORM FOR VERTICAL LEFT WHITE LENTICULAR BRACKET)
+ 7202	0xFE18	︘ (PRESENTATION FORM FOR VERTICAL RIGHT WHITE LENTICULAR BRAKCET)
  7203	0xFE3B	︻ (PRESENTATION FORM FOR VERTICAL LEFT BLACK LENTICULAR BRACKET)
  7204	0xFE3C	︼ (PRESENTATION FORM FOR VERTICAL RIGHT BLACK LENTICULAR BRACKET)
  7205	0xFE37	︷ (PRESENTATION FORM FOR VERTICAL LEFT CURLY BRACKET)
  7206	0xFE38	︸ (PRESENTATION FORM FOR VERTICAL RIGHT CURLY BRACKET)
  7207	0xFE31	︱ (PRESENTATION FORM FOR VERTICAL EM DASH)
- 7208	0xE796	 (<Private Use>)
+ 7208	0xFE19	︙ (PRESENTATION FORM FOR VERTICAL HORIZONTAL ELLIPSIS)
  7209	0xFE33	︳ (PRESENTATION FORM FOR VERTICAL LOW LINE)
  7210	0xFE34	︴ (PRESENTATION FORM FOR VERTICAL WAVY LOW LINE)
  7211	0xE797	 (<Private Use>)
@@ -23779,27 +23779,27 @@
 23772	0x3447	㑇 (<CJK Ideograph Extension A>)
 23773	0x2E88	⺈ (CJK RADICAL KNIFE ONE)
 23774	0x2E8B	⺋ (CJK RADICAL SEAL)
-23775	0xE81E	 (<Private Use>)
+23775	0x9FB4	龴 (<CJK Ideograph>)
 23776	0x359E	㖞 (<CJK Ideograph Extension A>)
 23777	0x361A	㘚 (<CJK Ideograph Extension A>)
 23778	0x360E	㘎 (<CJK Ideograph Extension A>)
 23779	0x2E8C	⺌ (CJK RADICAL SMALL ONE)
 23780	0x2E97	⺗ (CJK RADICAL HEART TWO)
 23781	0x396E	㥮 (<CJK Ideograph Extension A>)
 23782	0x3918	㤘 (<CJK Ideograph Extension A>)
-23783	0xE826	 (<Private Use>)
+23783	0x9FB5	龵 (<CJK Ideograph>)
 23784	0x39CF	㧏 (<CJK Ideograph Extension A>)
 23785	0x39DF	㧟 (<CJK Ideograph Extension A>)
 23786	0x3A73	㩳 (<CJK Ideograph Extension A>)
 23787	0x39D0	㧐 (<CJK Ideograph Extension A>)
-23788	0xE82B	 (<Private Use>)
-23789	0xE82C	 (<Private Use>)
+23788	0x9FB6	龶 (<CJK Ideograph>)
+23789	0x9FB7	龷 (<CJK Ideograph>)
 23790	0x3B4E	㭎 (<CJK Ideograph Extension A>)
 23791	0x3C6E	㱮 (<CJK Ideograph Extension A>)
 23792	0x3CE0	㳠 (<CJK Ideograph Extension A>)
 23793	0x2EA7	⺧ (CJK RADICAL COW)
 23794	0xE831	 (<Private Use>)
-23795	0xE832	 (<Private Use>)
+23795	0x9FB8	龸 (<CJK Ideograph>)
 23796	0x2EAA	⺪ (CJK RADICAL BOLT OF CLOTH)
 23797	0x4056	䁖 (<CJK Ideograph Extension A>)
 23798	0x415F	䅟 (<CJK Ideograph Extension A>)
@@ -23816,7 +23816,7 @@
 23809	0x44D6	䓖 (<CJK Ideograph Extension A>)
 23810	0x4661	䙡 (<CJK Ideograph Extension A>)
 23811	0x464C	䙌 (<CJK Ideograph Extension A>)
-23812	0xE843	 (<Private Use>)
+23812	0x9FB9	龹 (<CJK Ideograph>)
 23813	0x4723	䜣 (<CJK Ideograph Extension A>)
 23814	0x4729	䜩 (<CJK Ideograph Extension A>)
 23815	0x477C	䝼 (<CJK Ideograph Extension A>)
@@ -23833,7 +23833,7 @@
 23826	0x499B	䦛 (<CJK Ideograph Extension A>)
 23827	0x49B7	䦷 (<CJK Ideograph Extension A>)
 23828	0x49B6	䦶 (<CJK Ideograph Extension A>)
-23829	0xE854	 (<Private Use>)
+23829	0x9FBA	龺 (<CJK Ideograph>)
 23830	0xE855	 (<Private Use>)
 23831	0x4CA3	䲣 (<CJK Ideograph Extension A>)
 23832	0x4C9F	䲟 (<CJK Ideograph Extension A>)
@@ -23849,7 +23849,7 @@
 23842	0x4D18	䴘 (<CJK Ideograph Extension A>)
 23843	0x4D19	䴙 (<CJK Ideograph Extension A>)
 23844	0x4DAE	䶮 (<CJK Ideograph Extension A>)
-23845	0xE864	 (<Private Use>)
+23845	0x9FBB	龻 (<CJK Ideograph>)
 23846	0xE468	 (<Private Use>)
 23847	0xE469	 (<Private Use>)
 23848	0xE46A	 (<Private Use>)

index-ibm866.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: db6fe14a559d1601a7667338d83704773d5708dbc641e1ad3c5e21405770f05e
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x0410	А (CYRILLIC CAPITAL LETTER A)
   1	0x0411	Б (CYRILLIC CAPITAL LETTER BE)

index-iso-2022-jp-katakana.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: 6ffc12c11f6eab1ccb3dada740d9b0db096ef0b0783c3bd5ec951dcb4a44b95e
-# Date: 2018-01-06
+# Date: 2024-09-18
 
  0	0x3002	。 (IDEOGRAPHIC FULL STOP)
  1	0x300C	「 (LEFT CORNER BRACKET)

index-iso-8859-10.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: 02c2b5590d8ccda9931008c471f6ee2c590b2c8fe5e6ccb3b08638115d778507
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x0080	€ (<control>)
   1	0x0081	 (<control>)

index-iso-8859-13.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: 40736338e964ab520407cebcb01329f8d450abf6ce12bf88b74b655b60e43300
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x0080	€ (<control>)
   1	0x0081	 (<control>)

index-iso-8859-14.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: 2c8651cfc08b1f35b17919ee5379f2fa006af3ec809f11b3b7f470785580542b
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x0080	€ (<control>)
   1	0x0081	 (<control>)

index-iso-8859-15.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: a560aba47bccd7510a6ac77f671fe75dca3800f05cf6d676910c311a8f8ff079
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x0080	€ (<control>)
   1	0x0081	 (<control>)

index-iso-8859-16.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: 55676320d2d1b6e6909f5b3d741a7cf0cefc84e920aa4474afc091459111c2e3
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x0080	€ (<control>)
   1	0x0081	 (<control>)

index-iso-8859-2.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: 9569c67f22d0b57790e1c407c6eecf227e4562322dc296de43cdab7a0152ec73
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x0080	€ (<control>)
   1	0x0081	 (<control>)

index-iso-8859-3.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: af8f1e12df79b768322b5e83613698cdc619438270a2fc359554331c805054a3
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x0080	€ (<control>)
   1	0x0081	 (<control>)

index-iso-8859-4.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: 72f29c92344d351fe9e74a946e7e0468d76d542c6894ff82982cb652ebe0feb7
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x0080	€ (<control>)
   1	0x0081	 (<control>)

index-iso-8859-5.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: fa9b1f3f5242df43e2e7bca80e9b6997c67944f20a4af91ee06bacc4e132d9c9
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x0080	€ (<control>)
   1	0x0081	 (<control>)

index-iso-8859-6.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: 85bb7b5c2dc75975afebe5743935ba4ed5a09c1e9e34e9bfb2ff80293f5d8bbc
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x0080	€ (<control>)
   1	0x0081	 (<control>)

index-iso-8859-7.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: f53d8aeba36314ef950eef02ffcf11dff540638ce27dfe7a86b6ccc6875afb24
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x0080	€ (<control>)
   1	0x0081	 (<control>)

index-iso-8859-8.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: 7657a9ca3fa875990da960d3f812eea28dcd0ae6ed55a18d5394303c86f5484b
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x0080	€ (<control>)
   1	0x0081	 (<control>)

index-jis0208.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: cbaa91f3deb7d0841faf5c33041fc15a285da0e87e64ab802c4bf04b7c4da861
-# Date: 2018-01-06
+# Date: 2024-09-18
 
     0	0x3000	　 (IDEOGRAPHIC SPACE)
     1	0x3001	、 (IDEOGRAPHIC COMMA)

index-jis0212.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: 83bf90dd1c591a4355730d8c4567efc499d74da7490531019ef22a879991cfb7
-# Date: 2018-01-06
+# Date: 2024-09-18
 
  108	0x02D8	˘ (BREVE)
  109	0x02C7	ˇ (CARON)

index-koi8-r.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: c5497cd9071cb352c0e56b219154e539badf63de40b71578f09e2e11fe7d50ae
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x2500	─ (BOX DRAWINGS LIGHT HORIZONTAL)
   1	0x2502	│ (BOX DRAWINGS LIGHT VERTICAL)

index-koi8-u.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: 19a4da2c3f245118bbc8019326f45a07832949938ff903f03d62ac4da1f61f40
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x2500	─ (BOX DRAWINGS LIGHT HORIZONTAL)
   1	0x2502	│ (BOX DRAWINGS LIGHT VERTICAL)

index-macintosh.txt

@@ -2,7 +2,7 @@
 # https://encoding.spec.whatwg.org/
 #
 # Identifier: f2c6a4f6406b3e86a50a5dba4d2b7dd48e2e33c0d82aefe764535c934ec11764
-# Date: 2018-01-06
+# Date: 2024-09-18
 
   0	0x00C4	Ä (LATIN CAPITAL LETTER A WITH DIAERESIS)
   1	0x00C5	Å (LATIN CAPITAL LETTER A WITH RING ABOVE)