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dbcs-data.js
[add] server:lib:node_modules
Christian Fraß
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6e9c872
at 2021-03-08 23:52:07
dbcs-data.js
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"use strict"; // Description of supported double byte encodings and aliases. // Tables are not require()-d until they are needed to speed up library load. // require()-s are direct to support Browserify. module.exports = { // == Japanese/ShiftJIS ==================================================== // All japanese encodings are based on JIS X set of standards: // JIS X 0201 - Single-byte encoding of ASCII + ¥ + Kana chars at 0xA1-0xDF. // JIS X 0208 - Main set of 6879 characters, placed in 94x94 plane, to be encoded by 2 bytes. // Has several variations in 1978, 1983, 1990 and 1997. // JIS X 0212 - Supplementary plane of 6067 chars in 94x94 plane. 1990. Effectively dead. // JIS X 0213 - Extension and modern replacement of 0208 and 0212. Total chars: 11233. // 2 planes, first is superset of 0208, second - revised 0212. // Introduced in 2000, revised 2004. Some characters are in Unicode Plane 2 (0x2xxxx) // Byte encodings are: // * Shift_JIS: Compatible with 0201, uses not defined chars in top half as lead bytes for double-byte // encoding of 0208. Lead byte ranges: 0x81-0x9F, 0xE0-0xEF; Trail byte ranges: 0x40-0x7E, 0x80-0x9E, 0x9F-0xFC. // Windows CP932 is a superset of Shift_JIS. Some companies added more chars, notably KDDI. // * EUC-JP: Up to 3 bytes per character. Used mostly on *nixes. // 0x00-0x7F - lower part of 0201 // 0x8E, 0xA1-0xDF - upper part of 0201 // (0xA1-0xFE)x2 - 0208 plane (94x94). // 0x8F, (0xA1-0xFE)x2 - 0212 plane (94x94). // * JIS X 208: 7-bit, direct encoding of 0208. Byte ranges: 0x21-0x7E (94 values). Uncommon. // Used as-is in ISO2022 family. // * ISO2022-JP: Stateful encoding, with escape sequences to switch between ASCII, // 0201-1976 Roman, 0208-1978, 0208-1983. // * ISO2022-JP-1: Adds esc seq for 0212-1990. // * ISO2022-JP-2: Adds esc seq for GB2313-1980, KSX1001-1992, ISO8859-1, ISO8859-7. // * ISO2022-JP-3: Adds esc seq for 0201-1976 Kana set, 0213-2000 Planes 1, 2. // * ISO2022-JP-2004: Adds 0213-2004 Plane 1. // // After JIS X 0213 appeared, Shift_JIS-2004, EUC-JISX0213 and ISO2022-JP-2004 followed, with just changing the planes. // // Overall, it seems that it's a mess :( http://www8.plala.or.jp/tkubota1/unicode-symbols-map2.html 'shiftjis': { type: '_dbcs', table: function() { return require('./tables/shiftjis.json') }, encodeAdd: {'\u00a5': 0x5C, '\u203E': 0x7E}, encodeSkipVals: [{from: 0xED40, to: 0xF940}], }, 'csshiftjis': 'shiftjis', 'mskanji': 'shiftjis', 'sjis': 'shiftjis', 'windows31j': 'shiftjis', 'ms31j': 'shiftjis', 'xsjis': 'shiftjis', 'windows932': 'shiftjis', 'ms932': 'shiftjis', '932': 'shiftjis', 'cp932': 'shiftjis', 'eucjp': { type: '_dbcs', table: function() { return require('./tables/eucjp.json') }, encodeAdd: {'\u00a5': 0x5C, '\u203E': 0x7E}, }, // TODO: KDDI extension to Shift_JIS // TODO: IBM CCSID 942 = CP932, but F0-F9 custom chars and other char changes. // TODO: IBM CCSID 943 = Shift_JIS = CP932 with original Shift_JIS lower 128 chars. // == Chinese/GBK ========================================================== // http://en.wikipedia.org/wiki/GBK // We mostly implement W3C recommendation: https://www.w3.org/TR/encoding/#gbk-encoder // Oldest GB2312 (1981, ~7600 chars) is a subset of CP936 'gb2312': 'cp936', 'gb231280': 'cp936', 'gb23121980': 'cp936', 'csgb2312': 'cp936', 'csiso58gb231280': 'cp936', 'euccn': 'cp936', // Microsoft's CP936 is a subset and approximation of GBK. 'windows936': 'cp936', 'ms936': 'cp936', '936': 'cp936', 'cp936': { type: '_dbcs', table: function() { return require('./tables/cp936.json') }, }, // GBK (~22000 chars) is an extension of CP936 that added user-mapped chars and some other. 'gbk': { type: '_dbcs', table: function() { return require('./tables/cp936.json').concat(require('./tables/gbk-added.json')) }, }, 'xgbk': 'gbk', 'isoir58': 'gbk', // GB18030 is an algorithmic extension of GBK. // Main source: https://www.w3.org/TR/encoding/#gbk-encoder // http://icu-project.org/docs/papers/gb18030.html // http://source.icu-project.org/repos/icu/data/trunk/charset/data/xml/gb-18030-2000.xml // http://www.khngai.com/chinese/charmap/tblgbk.php?page=0 'gb18030': { type: '_dbcs', table: function() { return require('./tables/cp936.json').concat(require('./tables/gbk-added.json')) }, gb18030: function() { return require('./tables/gb18030-ranges.json') }, encodeSkipVals: [0x80], encodeAdd: {'€': 0xA2E3}, }, 'chinese': 'gb18030', // == Korean =============================================================== // EUC-KR, KS_C_5601 and KS X 1001 are exactly the same. 'windows949': 'cp949', 'ms949': 'cp949', '949': 'cp949', 'cp949': { type: '_dbcs', table: function() { return require('./tables/cp949.json') }, }, 'cseuckr': 'cp949', 'csksc56011987': 'cp949', 'euckr': 'cp949', 'isoir149': 'cp949', 'korean': 'cp949', 'ksc56011987': 'cp949', 'ksc56011989': 'cp949', 'ksc5601': 'cp949', // == Big5/Taiwan/Hong Kong ================================================ // There are lots of tables for Big5 and cp950. Please see the following links for history: // http://moztw.org/docs/big5/ http://www.haible.de/bruno/charsets/conversion-tables/Big5.html // Variations, in roughly number of defined chars: // * Windows CP 950: Microsoft variant of Big5. Canonical: http://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/CP950.TXT // * Windows CP 951: Microsoft variant of Big5-HKSCS-2001. Seems to be never public. http://me.abelcheung.org/articles/research/what-is-cp951/ // * Big5-2003 (Taiwan standard) almost superset of cp950. // * Unicode-at-on (UAO) / Mozilla 1.8. Falling out of use on the Web. Not supported by other browsers. // * Big5-HKSCS (-2001, -2004, -2008). Hong Kong standard. // many unicode code points moved from PUA to Supplementary plane (U+2XXXX) over the years. // Plus, it has 4 combining sequences. // Seems that Mozilla refused to support it for 10 yrs. https://bugzilla.mozilla.org/show_bug.cgi?id=162431 https://bugzilla.mozilla.org/show_bug.cgi?id=310299 // because big5-hkscs is the only encoding to include astral characters in non-algorithmic way. // Implementations are not consistent within browsers; sometimes labeled as just big5. // MS Internet Explorer switches from big5 to big5-hkscs when a patch applied. // Great discussion & recap of what's going on https://bugzilla.mozilla.org/show_bug.cgi?id=912470#c31 // In the encoder, it might make sense to support encoding old PUA mappings to Big5 bytes seq-s. // Official spec: http://www.ogcio.gov.hk/en/business/tech_promotion/ccli/terms/doc/2003cmp_2008.txt // http://www.ogcio.gov.hk/tc/business/tech_promotion/ccli/terms/doc/hkscs-2008-big5-iso.txt // // Current understanding of how to deal with Big5(-HKSCS) is in the Encoding Standard, http://encoding.spec.whatwg.org/#big5-encoder // Unicode mapping (http://www.unicode.org/Public/MAPPINGS/OBSOLETE/EASTASIA/OTHER/BIG5.TXT) is said to be wrong. 'windows950': 'cp950', 'ms950': 'cp950', '950': 'cp950', 'cp950': { type: '_dbcs', table: function() { return require('./tables/cp950.json') }, }, // Big5 has many variations and is an extension of cp950. We use Encoding Standard's as a consensus. 'big5': 'big5hkscs', 'big5hkscs': { type: '_dbcs', table: function() { return require('./tables/cp950.json').concat(require('./tables/big5-added.json')) }, encodeSkipVals: [0xa2cc], }, 'cnbig5': 'big5hkscs', 'csbig5': 'big5hkscs', 'xxbig5': 'big5hkscs', };
