516 lines
20 KiB
JavaScript
516 lines
20 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.LineBreaker = exports.inlineBreakOpportunities = exports.lineBreakAtIndex = exports.codePointsToCharacterClasses = exports.UnicodeTrie = exports.BREAK_ALLOWED = exports.BREAK_NOT_ALLOWED = exports.BREAK_MANDATORY = exports.classes = exports.LETTER_NUMBER_MODIFIER = void 0;
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var utrie_1 = require("utrie");
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var linebreak_trie_1 = require("./linebreak-trie");
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var Util_1 = require("./Util");
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exports.LETTER_NUMBER_MODIFIER = 50;
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// Non-tailorable Line Breaking Classes
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var BK = 1; // Cause a line break (after)
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var CR = 2; // Cause a line break (after), except between CR and LF
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var LF = 3; // Cause a line break (after)
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var CM = 4; // Prohibit a line break between the character and the preceding character
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var NL = 5; // Cause a line break (after)
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var SG = 6; // Do not occur in well-formed text
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var WJ = 7; // Prohibit line breaks before and after
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var ZW = 8; // Provide a break opportunity
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var GL = 9; // Prohibit line breaks before and after
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var SP = 10; // Enable indirect line breaks
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var ZWJ = 11; // Prohibit line breaks within joiner sequences
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// Break Opportunities
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var B2 = 12; // Provide a line break opportunity before and after the character
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var BA = 13; // Generally provide a line break opportunity after the character
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var BB = 14; // Generally provide a line break opportunity before the character
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var HY = 15; // Provide a line break opportunity after the character, except in numeric context
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var CB = 16; // Provide a line break opportunity contingent on additional information
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// Characters Prohibiting Certain Breaks
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var CL = 17; // Prohibit line breaks before
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var CP = 18; // Prohibit line breaks before
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var EX = 19; // Prohibit line breaks before
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var IN = 20; // Allow only indirect line breaks between pairs
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var NS = 21; // Allow only indirect line breaks before
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var OP = 22; // Prohibit line breaks after
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var QU = 23; // Act like they are both opening and closing
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// Numeric Context
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var IS = 24; // Prevent breaks after any and before numeric
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var NU = 25; // Form numeric expressions for line breaking purposes
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var PO = 26; // Do not break following a numeric expression
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var PR = 27; // Do not break in front of a numeric expression
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var SY = 28; // Prevent a break before; and allow a break after
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// Other Characters
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var AI = 29; // Act like AL when the resolvedEAW is N; otherwise; act as ID
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var AL = 30; // Are alphabetic characters or symbols that are used with alphabetic characters
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var CJ = 31; // Treat as NS or ID for strict or normal breaking.
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var EB = 32; // Do not break from following Emoji Modifier
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var EM = 33; // Do not break from preceding Emoji Base
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var H2 = 34; // Form Korean syllable blocks
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var H3 = 35; // Form Korean syllable blocks
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var HL = 36; // Do not break around a following hyphen; otherwise act as Alphabetic
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var ID = 37; // Break before or after; except in some numeric context
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var JL = 38; // Form Korean syllable blocks
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var JV = 39; // Form Korean syllable blocks
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var JT = 40; // Form Korean syllable blocks
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var RI = 41; // Keep pairs together. For pairs; break before and after other classes
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var SA = 42; // Provide a line break opportunity contingent on additional, language-specific context analysis
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var XX = 43; // Have as yet unknown line breaking behavior or unassigned code positions
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var ea_OP = [0x2329, 0xff08];
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exports.classes = {
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BK: BK,
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CR: CR,
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LF: LF,
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CM: CM,
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NL: NL,
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SG: SG,
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WJ: WJ,
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ZW: ZW,
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GL: GL,
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SP: SP,
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ZWJ: ZWJ,
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B2: B2,
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BA: BA,
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BB: BB,
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HY: HY,
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CB: CB,
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CL: CL,
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CP: CP,
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EX: EX,
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IN: IN,
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NS: NS,
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OP: OP,
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QU: QU,
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IS: IS,
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NU: NU,
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PO: PO,
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PR: PR,
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SY: SY,
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AI: AI,
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AL: AL,
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CJ: CJ,
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EB: EB,
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EM: EM,
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H2: H2,
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H3: H3,
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HL: HL,
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ID: ID,
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JL: JL,
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JV: JV,
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JT: JT,
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RI: RI,
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SA: SA,
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XX: XX,
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};
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exports.BREAK_MANDATORY = '!';
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exports.BREAK_NOT_ALLOWED = '×';
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exports.BREAK_ALLOWED = '÷';
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exports.UnicodeTrie = utrie_1.createTrieFromBase64(linebreak_trie_1.base64, linebreak_trie_1.byteLength);
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var ALPHABETICS = [AL, HL];
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var HARD_LINE_BREAKS = [BK, CR, LF, NL];
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var SPACE = [SP, ZW];
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var PREFIX_POSTFIX = [PR, PO];
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var LINE_BREAKS = HARD_LINE_BREAKS.concat(SPACE);
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var KOREAN_SYLLABLE_BLOCK = [JL, JV, JT, H2, H3];
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var HYPHEN = [HY, BA];
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var codePointsToCharacterClasses = function (codePoints, lineBreak) {
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if (lineBreak === void 0) { lineBreak = 'strict'; }
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var types = [];
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var indices = [];
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var categories = [];
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codePoints.forEach(function (codePoint, index) {
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var classType = exports.UnicodeTrie.get(codePoint);
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if (classType > exports.LETTER_NUMBER_MODIFIER) {
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categories.push(true);
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classType -= exports.LETTER_NUMBER_MODIFIER;
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}
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else {
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categories.push(false);
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}
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if (['normal', 'auto', 'loose'].indexOf(lineBreak) !== -1) {
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// U+2010, – U+2013, 〜 U+301C, ゠ U+30A0
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if ([0x2010, 0x2013, 0x301c, 0x30a0].indexOf(codePoint) !== -1) {
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indices.push(index);
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return types.push(CB);
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}
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}
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if (classType === CM || classType === ZWJ) {
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// LB10 Treat any remaining combining mark or ZWJ as AL.
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if (index === 0) {
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indices.push(index);
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return types.push(AL);
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}
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// LB9 Do not break a combining character sequence; treat it as if it has the line breaking class of
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// the base character in all of the following rules. Treat ZWJ as if it were CM.
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var prev = types[index - 1];
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if (LINE_BREAKS.indexOf(prev) === -1) {
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indices.push(indices[index - 1]);
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return types.push(prev);
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}
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indices.push(index);
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return types.push(AL);
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}
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indices.push(index);
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if (classType === CJ) {
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return types.push(lineBreak === 'strict' ? NS : ID);
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}
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if (classType === SA) {
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return types.push(AL);
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}
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if (classType === AI) {
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return types.push(AL);
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}
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// For supplementary characters, a useful default is to treat characters in the range 10000..1FFFD as AL
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// and characters in the ranges 20000..2FFFD and 30000..3FFFD as ID, until the implementation can be revised
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// to take into account the actual line breaking properties for these characters.
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if (classType === XX) {
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if ((codePoint >= 0x20000 && codePoint <= 0x2fffd) || (codePoint >= 0x30000 && codePoint <= 0x3fffd)) {
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return types.push(ID);
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}
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else {
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return types.push(AL);
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}
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}
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types.push(classType);
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});
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return [indices, types, categories];
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};
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exports.codePointsToCharacterClasses = codePointsToCharacterClasses;
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var isAdjacentWithSpaceIgnored = function (a, b, currentIndex, classTypes) {
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var current = classTypes[currentIndex];
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if (Array.isArray(a) ? a.indexOf(current) !== -1 : a === current) {
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var i = currentIndex;
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while (i <= classTypes.length) {
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i++;
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var next = classTypes[i];
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if (next === b) {
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return true;
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}
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if (next !== SP) {
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break;
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}
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}
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}
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if (current === SP) {
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var i = currentIndex;
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while (i > 0) {
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i--;
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var prev = classTypes[i];
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if (Array.isArray(a) ? a.indexOf(prev) !== -1 : a === prev) {
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var n = currentIndex;
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while (n <= classTypes.length) {
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n++;
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var next = classTypes[n];
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if (next === b) {
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return true;
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}
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if (next !== SP) {
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break;
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}
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}
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}
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if (prev !== SP) {
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break;
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}
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}
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}
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return false;
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};
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var previousNonSpaceClassType = function (currentIndex, classTypes) {
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var i = currentIndex;
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while (i >= 0) {
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var type = classTypes[i];
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if (type === SP) {
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i--;
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}
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else {
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return type;
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}
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}
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return 0;
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};
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var _lineBreakAtIndex = function (codePoints, classTypes, indicies, index, forbiddenBreaks) {
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if (indicies[index] === 0) {
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return exports.BREAK_NOT_ALLOWED;
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}
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var currentIndex = index - 1;
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if (Array.isArray(forbiddenBreaks) && forbiddenBreaks[currentIndex] === true) {
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return exports.BREAK_NOT_ALLOWED;
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}
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var beforeIndex = currentIndex - 1;
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var afterIndex = currentIndex + 1;
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var current = classTypes[currentIndex];
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// LB4 Always break after hard line breaks.
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// LB5 Treat CR followed by LF, as well as CR, LF, and NL as hard line breaks.
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var before = beforeIndex >= 0 ? classTypes[beforeIndex] : 0;
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var next = classTypes[afterIndex];
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if (current === CR && next === LF) {
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return exports.BREAK_NOT_ALLOWED;
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}
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if (HARD_LINE_BREAKS.indexOf(current) !== -1) {
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return exports.BREAK_MANDATORY;
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}
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// LB6 Do not break before hard line breaks.
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if (HARD_LINE_BREAKS.indexOf(next) !== -1) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB7 Do not break before spaces or zero width space.
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if (SPACE.indexOf(next) !== -1) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB8 Break before any character following a zero-width space, even if one or more spaces intervene.
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if (previousNonSpaceClassType(currentIndex, classTypes) === ZW) {
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return exports.BREAK_ALLOWED;
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}
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// LB8a Do not break after a zero width joiner.
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if (exports.UnicodeTrie.get(codePoints[currentIndex]) === ZWJ) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// zwj emojis
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if ((current === EB || current === EM) && exports.UnicodeTrie.get(codePoints[afterIndex]) === ZWJ) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB11 Do not break before or after Word joiner and related characters.
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if (current === WJ || next === WJ) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB12 Do not break after NBSP and related characters.
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if (current === GL) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB12a Do not break before NBSP and related characters, except after spaces and hyphens.
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if ([SP, BA, HY].indexOf(current) === -1 && next === GL) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB13 Do not break before ‘]’ or ‘!’ or ‘;’ or ‘/’, even after spaces.
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if ([CL, CP, EX, IS, SY].indexOf(next) !== -1) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB14 Do not break after ‘[’, even after spaces.
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if (previousNonSpaceClassType(currentIndex, classTypes) === OP) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB15 Do not break within ‘”[’, even with intervening spaces.
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if (isAdjacentWithSpaceIgnored(QU, OP, currentIndex, classTypes)) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB16 Do not break between closing punctuation and a nonstarter (lb=NS), even with intervening spaces.
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if (isAdjacentWithSpaceIgnored([CL, CP], NS, currentIndex, classTypes)) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB17 Do not break within ‘——’, even with intervening spaces.
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if (isAdjacentWithSpaceIgnored(B2, B2, currentIndex, classTypes)) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB18 Break after spaces.
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if (current === SP) {
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return exports.BREAK_ALLOWED;
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}
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// LB19 Do not break before or after quotation marks, such as ‘ ” ’.
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if (current === QU || next === QU) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB20 Break before and after unresolved CB.
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if (next === CB || current === CB) {
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return exports.BREAK_ALLOWED;
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}
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// LB21 Do not break before hyphen-minus, other hyphens, fixed-width spaces, small kana, and other non-starters, or after acute accents.
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if ([BA, HY, NS].indexOf(next) !== -1 || current === BB) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB21a Don't break after Hebrew + Hyphen.
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if (before === HL && HYPHEN.indexOf(current) !== -1) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB21b Don’t break between Solidus and Hebrew letters.
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if (current === SY && next === HL) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB22 Do not break before ellipsis.
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if (next === IN) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB23 Do not break between digits and letters.
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if ((ALPHABETICS.indexOf(next) !== -1 && current === NU) || (ALPHABETICS.indexOf(current) !== -1 && next === NU)) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB23a Do not break between numeric prefixes and ideographs, or between ideographs and numeric postfixes.
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if ((current === PR && [ID, EB, EM].indexOf(next) !== -1) ||
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([ID, EB, EM].indexOf(current) !== -1 && next === PO)) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB24 Do not break between numeric prefix/postfix and letters, or between letters and prefix/postfix.
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if ((ALPHABETICS.indexOf(current) !== -1 && PREFIX_POSTFIX.indexOf(next) !== -1) ||
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(PREFIX_POSTFIX.indexOf(current) !== -1 && ALPHABETICS.indexOf(next) !== -1)) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB25 Do not break between the following pairs of classes relevant to numbers:
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if (
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// (PR | PO) × ( OP | HY )? NU
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([PR, PO].indexOf(current) !== -1 &&
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(next === NU || ([OP, HY].indexOf(next) !== -1 && classTypes[afterIndex + 1] === NU))) ||
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// ( OP | HY ) × NU
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([OP, HY].indexOf(current) !== -1 && next === NU) ||
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// NU × (NU | SY | IS)
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(current === NU && [NU, SY, IS].indexOf(next) !== -1)) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// NU (NU | SY | IS)* × (NU | SY | IS | CL | CP)
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if ([NU, SY, IS, CL, CP].indexOf(next) !== -1) {
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var prevIndex = currentIndex;
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while (prevIndex >= 0) {
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var type = classTypes[prevIndex];
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if (type === NU) {
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return exports.BREAK_NOT_ALLOWED;
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}
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else if ([SY, IS].indexOf(type) !== -1) {
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prevIndex--;
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}
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else {
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break;
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}
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}
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}
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// NU (NU | SY | IS)* (CL | CP)? × (PO | PR))
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if ([PR, PO].indexOf(next) !== -1) {
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var prevIndex = [CL, CP].indexOf(current) !== -1 ? beforeIndex : currentIndex;
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while (prevIndex >= 0) {
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var type = classTypes[prevIndex];
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if (type === NU) {
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return exports.BREAK_NOT_ALLOWED;
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}
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else if ([SY, IS].indexOf(type) !== -1) {
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prevIndex--;
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}
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else {
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break;
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}
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}
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}
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// LB26 Do not break a Korean syllable.
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if ((JL === current && [JL, JV, H2, H3].indexOf(next) !== -1) ||
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([JV, H2].indexOf(current) !== -1 && [JV, JT].indexOf(next) !== -1) ||
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([JT, H3].indexOf(current) !== -1 && next === JT)) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB27 Treat a Korean Syllable Block the same as ID.
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if ((KOREAN_SYLLABLE_BLOCK.indexOf(current) !== -1 && [IN, PO].indexOf(next) !== -1) ||
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(KOREAN_SYLLABLE_BLOCK.indexOf(next) !== -1 && current === PR)) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB28 Do not break between alphabetics (“at”).
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if (ALPHABETICS.indexOf(current) !== -1 && ALPHABETICS.indexOf(next) !== -1) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB29 Do not break between numeric punctuation and alphabetics (“e.g.”).
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if (current === IS && ALPHABETICS.indexOf(next) !== -1) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB30 Do not break between letters, numbers, or ordinary symbols and opening or closing parentheses.
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if ((ALPHABETICS.concat(NU).indexOf(current) !== -1 &&
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next === OP &&
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ea_OP.indexOf(codePoints[afterIndex]) === -1) ||
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(ALPHABETICS.concat(NU).indexOf(next) !== -1 && current === CP)) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB30a Break between two regional indicator symbols if and only if there are an even number of regional
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// indicators preceding the position of the break.
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if (current === RI && next === RI) {
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var i = indicies[currentIndex];
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var count = 1;
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while (i > 0) {
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i--;
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if (classTypes[i] === RI) {
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count++;
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}
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else {
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break;
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}
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}
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if (count % 2 !== 0) {
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return exports.BREAK_NOT_ALLOWED;
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}
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}
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// LB30b Do not break between an emoji base and an emoji modifier.
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if (current === EB && next === EM) {
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return exports.BREAK_NOT_ALLOWED;
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}
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return exports.BREAK_ALLOWED;
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};
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var lineBreakAtIndex = function (codePoints, index) {
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// LB2 Never break at the start of text.
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if (index === 0) {
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return exports.BREAK_NOT_ALLOWED;
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}
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// LB3 Always break at the end of text.
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if (index >= codePoints.length) {
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return exports.BREAK_MANDATORY;
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}
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var _a = exports.codePointsToCharacterClasses(codePoints), indices = _a[0], classTypes = _a[1];
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return _lineBreakAtIndex(codePoints, classTypes, indices, index);
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||
};
|
||
exports.lineBreakAtIndex = lineBreakAtIndex;
|
||
var cssFormattedClasses = function (codePoints, options) {
|
||
if (!options) {
|
||
options = { lineBreak: 'normal', wordBreak: 'normal' };
|
||
}
|
||
var _a = exports.codePointsToCharacterClasses(codePoints, options.lineBreak), indicies = _a[0], classTypes = _a[1], isLetterNumber = _a[2];
|
||
if (options.wordBreak === 'break-all' || options.wordBreak === 'break-word') {
|
||
classTypes = classTypes.map(function (type) { return ([NU, AL, SA].indexOf(type) !== -1 ? ID : type); });
|
||
}
|
||
var forbiddenBreakpoints = options.wordBreak === 'keep-all'
|
||
? isLetterNumber.map(function (letterNumber, i) {
|
||
return letterNumber && codePoints[i] >= 0x4e00 && codePoints[i] <= 0x9fff;
|
||
})
|
||
: undefined;
|
||
return [indicies, classTypes, forbiddenBreakpoints];
|
||
};
|
||
var inlineBreakOpportunities = function (str, options) {
|
||
var codePoints = Util_1.toCodePoints(str);
|
||
var output = exports.BREAK_NOT_ALLOWED;
|
||
var _a = cssFormattedClasses(codePoints, options), indicies = _a[0], classTypes = _a[1], forbiddenBreakpoints = _a[2];
|
||
codePoints.forEach(function (codePoint, i) {
|
||
output +=
|
||
Util_1.fromCodePoint(codePoint) +
|
||
(i >= codePoints.length - 1
|
||
? exports.BREAK_MANDATORY
|
||
: _lineBreakAtIndex(codePoints, classTypes, indicies, i + 1, forbiddenBreakpoints));
|
||
});
|
||
return output;
|
||
};
|
||
exports.inlineBreakOpportunities = inlineBreakOpportunities;
|
||
var Break = /** @class */ (function () {
|
||
function Break(codePoints, lineBreak, start, end) {
|
||
this.codePoints = codePoints;
|
||
this.required = lineBreak === exports.BREAK_MANDATORY;
|
||
this.start = start;
|
||
this.end = end;
|
||
}
|
||
Break.prototype.slice = function () {
|
||
return Util_1.fromCodePoint.apply(void 0, this.codePoints.slice(this.start, this.end));
|
||
};
|
||
return Break;
|
||
}());
|
||
var LineBreaker = function (str, options) {
|
||
var codePoints = Util_1.toCodePoints(str);
|
||
var _a = cssFormattedClasses(codePoints, options), indicies = _a[0], classTypes = _a[1], forbiddenBreakpoints = _a[2];
|
||
var length = codePoints.length;
|
||
var lastEnd = 0;
|
||
var nextIndex = 0;
|
||
return {
|
||
next: function () {
|
||
if (nextIndex >= length) {
|
||
return { done: true, value: null };
|
||
}
|
||
var lineBreak = exports.BREAK_NOT_ALLOWED;
|
||
while (nextIndex < length &&
|
||
(lineBreak = _lineBreakAtIndex(codePoints, classTypes, indicies, ++nextIndex, forbiddenBreakpoints)) ===
|
||
exports.BREAK_NOT_ALLOWED) { }
|
||
if (lineBreak !== exports.BREAK_NOT_ALLOWED || nextIndex === length) {
|
||
var value = new Break(codePoints, lineBreak, lastEnd, nextIndex);
|
||
lastEnd = nextIndex;
|
||
return { value: value, done: false };
|
||
}
|
||
return { done: true, value: null };
|
||
},
|
||
};
|
||
};
|
||
exports.LineBreaker = LineBreaker;
|
||
//# sourceMappingURL=LineBreak.js.map
|