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6ec808b8df
ES and TypeScript modules are strict by default and don’t need this directive. ESLint will remind us to add it to new CommonJS files and remove it from ES and TypeScript modules. Signed-off-by: Anders Kaseorg <anders@zulip.com>
171 lines
7.8 KiB
JavaScript
171 lines
7.8 KiB
JavaScript
"use strict";
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const util = require("./util");
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// How to determine the direction of a paragraph (P1-P3): https://www.unicode.org/reports/tr9/tr9-35.html#The_Paragraph_Level
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// Embedding level: https://www.unicode.org/reports/tr9/tr9-35.html#BD2
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// How to find the matching PDI for an isolation initiator: https://www.unicode.org/reports/tr9/tr9-35.html#BD9
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// Bidirectional character types: https://www.unicode.org/reports/tr9/tr9-35.html#Table_Bidirectional_Character_Types
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// Ranges data is extracted from: https://www.unicode.org/Public/9.0.0/ucd/extracted/DerivedBidiClass.txt
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// References:
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// https://www.unicode.org/reports/tr44/tr44-18.html#UnicodeData.txt
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// https://www.unicode.org/reports/tr44/tr44-18.html#Extracted_Properties_Table
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// https://www.unicode.org/Public/9.0.0/ucd/UnicodeData.txt
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// https://www.unicode.org/Public/9.0.0/ucd/extracted/DerivedBidiClass.txt
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/**
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* Splits {@link raw} into parts of length {@link part_length},
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* and then converts each part to a character using simple base
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* conversion with the digits {@link digits}.
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* @param {string} digits
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* @param {number} part_length
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* @param {string} raw
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* @returns {number[]}
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*/
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function convert_from_raw(digits, part_length, raw) {
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const result = [];
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for (let i = 0; i < raw.length; ) {
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let t = 0;
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for (let j = 0; j < part_length; j += 1) {
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t = t * digits.length + digits.indexOf(raw.charAt(i));
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i += 1;
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}
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result.push(t);
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}
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return result;
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}
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/** Isolate initiator characters. */
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const i_chars = [0x2066, 0x2067, 0x2068];
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/** Pop directional isolate character. */
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const pdi_chars = [0x2069];
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/** The digits that are used for base conversions from base 92. */
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const digits =
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'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&()*+,-./:;<=>?@[]^_`{|}~';
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/**
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* Ranges of strong non-left-to-right characters (right-to-left, and arabic-letter).
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*
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* The ranges are stored as pairs of characters, the first
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* character of the range, and the last character of the range.
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* All ranges are concatenated together and stored here.
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*/
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const rl_ranges = convert_from_raw(
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digits,
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2,
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'fIfIf}f}g0g0g3g3g6g6g8g"g,g,g/g/g;g;g~hKh?h[h^j1jhjijqjrjCjYj!j~krlplBm2mcmdmimJmOmOmYmYm#m#m*nknooP|j|j',
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).concat(
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convert_from_raw(
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digits,
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3,
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'7S)7S)7S+7S>7S@7YZ7Y#7!n7!U7!(7!*7!+7#07$O7}U81%81(84g84k84k84n84r84w84+84/84<84>86Y86"87Q87Y8gv8g"8k=e)]e,fe,ne-De-Le|je|mf0f',
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),
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);
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/**
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* Ranges of strong left-to-right characters.
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*
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* The ranges are stored as pairs of characters, the first
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* character of the range, and the last character of the range.
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* All ranges are concatenated together and stored here.
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*/
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const lr_ranges = convert_from_raw(
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digits,
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2,
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'0$0}151u1<1<1|1|2222282u2w2!2#7Q7T7Z7:7;80848e8e9Q9T9W9$9&9+9.9.9:b1b3cOcWfBfDfEp7pZp"p"p$p(p;p>p@p]q0q9qcqEqGr7r9rcrhrorqrJrMrZr#r*r,r:r=sHsJsMsPsSsVsWs!s#s%t3t6t8tatktnt=t?t]t}t}u1u4u6upusuEuGuUuWvnvpvqvsvsvxvEvGvNvPvZv#w1w3w"w$w:w<xmxvxzxBy5y9ydyhyhymysyvyFyIy"y+y,y.zDzFzTzWz;z>AgAiA>A^B0B2BlBoCxCzCFCJCJCLDIDKDLDTDWDYD%D/E>E@E[E}E}F1FbFiF~G2GsGuGuGwGwGCG{HbHbHhHhHkHoHAHAH-H?H[J0J5J5JcJcJfJgJjJHJKJNJRJ(J-J^J`J{J~K4K6KkKmR>R]SDSOTXTZ!T!V!@!^#h#l#N#R#?#]$l$o$`$}$}%6%d%f%g%s%y%A%A%C%T%%%+%`(k(n(U(W)[)`)}*1*9*b*g*k*n*p*r*u+|,w,S,V,W,Y-p-r-r-z-z-B-B-D-E-N-S-$-%-(.n.D/b/g/"/$/$/+/+/-/;/=:q:A:L:O:?:_:`:}:};2;V;X;X;!;#;%;%;*<z<I<J<M>f>j>j>x>x>F>I>K>P>R>T>W@+[y[C[I{s{u{u{y{I{M{Y{#{:{>|0|3|3|i|i}p}r}D}D}T}+~Z~/~<~<~[~[',
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).concat(
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convert_from_raw(
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digits,
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3,
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'0~_10310510510910d10k10k10m10m10o10o10q10t10v10F10I10L10R10V10!10"10>11s11w11z15}16%17117118f18f18T18=18~19j19>1a$1fU1fU1js1m71s]1s^1tq1tr1t!1t#1t;1t;1t_1uj1uo1w]1w~1x21x61xc1xk1yS1yU1zX1A)1Bz1B!1B!1CY1C+1Fa1Fz1FM1FP1FV1FX1F^1G11G61G71G91Gd1Gg1Gk1Go1Hk1Hp1Hr1Ht1Iq1Is1KD1K:1LE1LH1L~1Mg1MH1ML1N41Nk1Nv1NA1Pi1Pn1Qt1Qw1Q!1Q#2wv2x44|[4}L52452853a53s53V53Y54L54O54"55656f56h57J57L57N57P57S57U57>57[57[57{58758a58&58,59T59W59[5aa5aZ5a*5b25be5bX5b"5ci5ck5cl5cq5cr5ct5c(5c*5dI5dP5dQ5dT5dU5dX5d*5d,5d=5d?5ez5eB5e`5e|5e|5f15f25f55f95fc5fc5fe5fT5fW5f$5f&5is5iu5iv5ix5iA5iC7S(7"67"b7""7""7"[7"[7"{7"~7$Q7$Q7$^7%i7%p7%O7%!7&~7(77(77(f7(f7(w7+c7+e7+/7,Z7,"7,:7,=7,?7->7-@7:v7:Y7;|7<37}T8k>8k>8k@8lH8lX8l)8l}8mm8mq8m.8m=8m>8m[8nX8n"8o68oc8oc8ol8o@8o]8p38p68pV8p&8p;8p?8q_8q}8q~8r18r18r48r98rb8s<8s>8s@8s~8tj8tm8t=8t?8t[8t^8ut8uB8uD8uJ8wT8w#8w$8w)8w)8w+8x_8y18y18y38y68y98y98yc8A$8A*8A/8A<8A<8A?8Bf8Bi8Ca8Cj8Ck8Cm8Cm8Cp8CT8C)8DC8DE8DE8DG8DH8DO8DO8DQ8EY8E#8E$8E*8E*8E:8S+8S=8S=8S_8T;8U88U98Uh8Uh8Uk8Uk8Una|[a||a}Ta}"ba*ba/dFgdFjdFjdFoe72e76e7ee7ve7we7Ee7)e7.e8"e9GebHecDemiemkem:em<enGenIeo8eoaeo%eo(eo;epAeu`evPevSewdewkewmewzewBewWew#ew#ew>eLXeL&eL&eL^eL_eM2eM2eM5eM5eMbe)[f0Yf0"f1,f1[f27f28f2of2of2Ef2Ef2<f2`f39f49f4cf8LfjffjrfjFfjHfjPfjXfk]fl3fl|fmDfmQfmTfnkfnrfnCfnHfn]fn~foufpzfpPfpPfpYfp&fp)fp*fp[fp[fq4fq7fqnfqTfq.frrfrtfIZfI#nl1nl4u|xu|AC$$C$(KG5KG8SiBSiEZ_)Z_,)"9)"c;DF;DI^f-',
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),
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convert_from_raw(digits, 4, "0^f:10]d10]g18YJ18YM1gA;1g?A1odh1odk1v?N1v?Q1DV?1DV]1DV]"),
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);
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/**
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* Gets a character and returns a simplified version of its bidirectional class.
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* @param {number} ch A character to get its bidirectional class.
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* @returns {'I' | 'PDI' | 'R' | 'L' | 'Other'}
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*/
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function get_bidi_class(ch) {
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if (i_chars.includes(ch)) {
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return "I"; // LRI, RLI, FSI
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}
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if (pdi_chars.includes(ch)) {
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return "PDI";
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}
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let i = util.lower_bound(rl_ranges, ch);
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if (i < rl_ranges.length && (rl_ranges[i] === ch || i % 2 === 1)) {
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return "R"; // R, AL
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}
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i = util.lower_bound(lr_ranges, ch);
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if (i < lr_ranges.length && (lr_ranges[i] === ch || i % 2 === 1)) {
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return "L";
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}
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return "Other";
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}
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/**
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* Gets the direction that should be used to show the string.
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* @param {string} str The string to get its direction.
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* @returns {'ltr' | 'rtl'}
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*/
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exports.get_direction = function (str) {
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let isolations = 0;
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for (let i = 0; i < str.length; i += 1) {
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// Extracting high and low surrogates and putting them together.
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// See https://en.wikipedia.org/wiki/UTF-16#Description or section 3 of https://tools.ietf.org/html/rfc2781.
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let ch = str.charCodeAt(i);
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if (ch >= 0xd800 && ch < 0xe000) {
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// 0xd800 <= ch < 0xe000
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// ch is inside surrogate range.
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// If it made a surrogate pair with the next character, put them together.
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// Otherwise, ignore the encoding error and leave it as it is.
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if (ch < 0xdc00) {
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const ch2 = i + 1 < str.length ? str.charCodeAt(i + 1) : 0;
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if (ch2 >= 0xdc00 && ch2 < 0xe000) {
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// 0xdc00 <= ch2 < 0xe000
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// ch = ch & 0x3ff;
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ch -= 0xd800;
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// ch = 0x10000 | (ch << 10) | (ch2 & 0x3ff);
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ch = 0x10000 + ch * 0x400 + (ch2 - 0xdc00);
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i += 1;
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}
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}
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}
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const bidi_class = get_bidi_class(ch);
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if (bidi_class === "I") {
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// LRI, RLI, FSI
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isolations += 1;
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} else if (bidi_class === "PDI") {
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if (isolations > 0) {
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isolations -= 1;
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}
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} else if (bidi_class === "R") {
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// R, AL
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if (isolations === 0) {
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return "rtl";
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}
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} else if (bidi_class === "L") {
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if (isolations === 0) {
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return "ltr";
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}
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}
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}
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return "ltr";
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};
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exports.set_rtl_class_for_textarea = function (textarea) {
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// Set the rtl class if the text has an rtl direction, remove it otherwise
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let text = textarea.val();
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if (text.startsWith("```quote")) {
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text = text.substr(8);
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}
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if (exports.get_direction(text) === "rtl") {
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textarea.addClass("rtl");
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} else {
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textarea.removeClass("rtl");
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}
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};
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window.rtl = exports;
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