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| Viewing file: Select action/file-type: import {
BN_LIKE_TYPES,
getBidiCharType,
ISOLATE_INIT_TYPES,
NEUTRAL_ISOLATE_TYPES,
STRONG_TYPES,
TRAILING_TYPES,
TYPES
} from './charTypes.js'
import { closingToOpeningBracket, getCanonicalBracket, openingToClosingBracket } from './brackets.js'
// Local type aliases
const {
L: TYPE_L,
R: TYPE_R,
EN: TYPE_EN,
ES: TYPE_ES,
ET: TYPE_ET,
AN: TYPE_AN,
CS: TYPE_CS,
B: TYPE_B,
S: TYPE_S,
ON: TYPE_ON,
BN: TYPE_BN,
NSM: TYPE_NSM,
AL: TYPE_AL,
LRO: TYPE_LRO,
RLO: TYPE_RLO,
LRE: TYPE_LRE,
RLE: TYPE_RLE,
PDF: TYPE_PDF,
LRI: TYPE_LRI,
RLI: TYPE_RLI,
FSI: TYPE_FSI,
PDI: TYPE_PDI
} = TYPES
/**
* @typedef {object} GetEmbeddingLevelsResult
* @property {{start, end, level}[]} paragraphs
* @property {Uint8Array} levels
*/
/**
* This function applies the Bidirectional Algorithm to a string, returning the resolved embedding levels
* in a single Uint8Array plus a list of objects holding each paragraph's start and end indices and resolved
* base embedding level.
*
* @param {string} string - The input string
* @param {"ltr"|"rtl"|"auto"} [baseDirection] - Use "ltr" or "rtl" to force a base paragraph direction,
* otherwise a direction will be chosen automatically from each paragraph's contents.
* @return {GetEmbeddingLevelsResult}
*/
export function getEmbeddingLevels (string, baseDirection) {
const MAX_DEPTH = 125
// Start by mapping all characters to their unicode type, as a bitmask integer
const charTypes = new Uint32Array(string.length)
for (let i = 0; i < string.length; i++) {
charTypes[i] = getBidiCharType(string[i])
}
const charTypeCounts = new Map() //will be cleared at start of each paragraph
function changeCharType(i, type) {
const oldType = charTypes[i]
charTypes[i] = type
charTypeCounts.set(oldType, charTypeCounts.get(oldType) - 1)
if (oldType & NEUTRAL_ISOLATE_TYPES) {
charTypeCounts.set(NEUTRAL_ISOLATE_TYPES, charTypeCounts.get(NEUTRAL_ISOLATE_TYPES) - 1)
}
charTypeCounts.set(type, (charTypeCounts.get(type) || 0) + 1)
if (type & NEUTRAL_ISOLATE_TYPES) {
charTypeCounts.set(NEUTRAL_ISOLATE_TYPES, (charTypeCounts.get(NEUTRAL_ISOLATE_TYPES) || 0) + 1)
}
}
const embedLevels = new Uint8Array(string.length)
const isolationPairs = new Map() //init->pdi and pdi->init
// === 3.3.1 The Paragraph Level ===
// 3.3.1 P1: Split the text into paragraphs
const paragraphs = [] // [{start, end, level}, ...]
let paragraph = null
for (let i = 0; i < string.length; i++) {
if (!paragraph) {
paragraphs.push(paragraph = {
start: i,
end: string.length - 1,
// 3.3.1 P2-P3: Determine the paragraph level
level: baseDirection === 'rtl' ? 1 : baseDirection === 'ltr' ? 0 : determineAutoEmbedLevel(i, false)
})
}
if (charTypes[i] & TYPE_B) {
paragraph.end = i
paragraph = null
}
}
const FORMATTING_TYPES = TYPE_RLE | TYPE_LRE | TYPE_RLO | TYPE_LRO | ISOLATE_INIT_TYPES | TYPE_PDI | TYPE_PDF | TYPE_B
const nextEven = n => n + ((n & 1) ? 1 : 2)
const nextOdd = n => n + ((n & 1) ? 2 : 1)
// Everything from here on will operate per paragraph.
for (let paraIdx = 0; paraIdx < paragraphs.length; paraIdx++) {
paragraph = paragraphs[paraIdx]
const statusStack = [{
_level: paragraph.level,
_override: 0, //0=neutral, 1=L, 2=R
_isolate: 0 //bool
}]
let stackTop
let overflowIsolateCount = 0
let overflowEmbeddingCount = 0
let validIsolateCount = 0
charTypeCounts.clear()
// === 3.3.2 Explicit Levels and Directions ===
for (let i = paragraph.start; i <= paragraph.end; i++) {
let charType = charTypes[i]
stackTop = statusStack[statusStack.length - 1]
// Set initial counts
charTypeCounts.set(charType, (charTypeCounts.get(charType) || 0) + 1)
if (charType & NEUTRAL_ISOLATE_TYPES) {
charTypeCounts.set(NEUTRAL_ISOLATE_TYPES, (charTypeCounts.get(NEUTRAL_ISOLATE_TYPES) || 0) + 1)
}
// Explicit Embeddings: 3.3.2 X2 - X3
if (charType & FORMATTING_TYPES) { //prefilter all formatters
if (charType & (TYPE_RLE | TYPE_LRE)) {
embedLevels[i] = stackTop._level // 5.2
const level = (charType === TYPE_RLE ? nextOdd : nextEven)(stackTop._level)
if (level <= MAX_DEPTH && !overflowIsolateCount && !overflowEmbeddingCount) {
statusStack.push({
_level: level,
_override: 0,
_isolate: 0
})
} else if (!overflowIsolateCount) {
overflowEmbeddingCount++
}
}
// Explicit Overrides: 3.3.2 X4 - X5
else if (charType & (TYPE_RLO | TYPE_LRO)) {
embedLevels[i] = stackTop._level // 5.2
const level = (charType === TYPE_RLO ? nextOdd : nextEven)(stackTop._level)
if (level <= MAX_DEPTH && !overflowIsolateCount && !overflowEmbeddingCount) {
statusStack.push({
_level: level,
_override: (charType & TYPE_RLO) ? TYPE_R : TYPE_L,
_isolate: 0
})
} else if (!overflowIsolateCount) {
overflowEmbeddingCount++
}
}
// Isolates: 3.3.2 X5a - X5c
else if (charType & ISOLATE_INIT_TYPES) {
// X5c - FSI becomes either RLI or LRI
if (charType & TYPE_FSI) {
charType = determineAutoEmbedLevel(i + 1, true) === 1 ? TYPE_RLI : TYPE_LRI
}
embedLevels[i] = stackTop._level
if (stackTop._override) {
changeCharType(i, stackTop._override)
}
const level = (charType === TYPE_RLI ? nextOdd : nextEven)(stackTop._level)
if (level <= MAX_DEPTH && overflowIsolateCount === 0 && overflowEmbeddingCount === 0) {
validIsolateCount++
statusStack.push({
_level: level,
_override: 0,
_isolate: 1,
_isolInitIndex: i
})
} else {
overflowIsolateCount++
}
}
// Terminating Isolates: 3.3.2 X6a
else if (charType & TYPE_PDI) {
if (overflowIsolateCount > 0) {
overflowIsolateCount--
} else if (validIsolateCount > 0) {
overflowEmbeddingCount = 0
while (!statusStack[statusStack.length - 1]._isolate) {
statusStack.pop()
}
// Add to isolation pairs bidirectional mapping:
const isolInitIndex = statusStack[statusStack.length - 1]._isolInitIndex
if (isolInitIndex != null) {
isolationPairs.set(isolInitIndex, i)
isolationPairs.set(i, isolInitIndex)
}
statusStack.pop()
validIsolateCount--
}
stackTop = statusStack[statusStack.length - 1]
embedLevels[i] = stackTop._level
if (stackTop._override) {
changeCharType(i, stackTop._override)
}
}
// Terminating Embeddings and Overrides: 3.3.2 X7
else if (charType & TYPE_PDF) {
if (overflowIsolateCount === 0) {
if (overflowEmbeddingCount > 0) {
overflowEmbeddingCount--
} else if (!stackTop._isolate && statusStack.length > 1) {
statusStack.pop()
stackTop = statusStack[statusStack.length - 1]
}
}
embedLevels[i] = stackTop._level // 5.2
}
// End of Paragraph: 3.3.2 X8
else if (charType & TYPE_B) {
embedLevels[i] = paragraph.level
}
}
// Non-formatting characters: 3.3.2 X6
else {
embedLevels[i] = stackTop._level
// NOTE: This exclusion of BN seems to go against what section 5.2 says, but is required for test passage
if (stackTop._override && charType !== TYPE_BN) {
changeCharType(i, stackTop._override)
}
}
}
// === 3.3.3 Preparations for Implicit Processing ===
// Remove all RLE, LRE, RLO, LRO, PDF, and BN characters: 3.3.3 X9
// Note: Due to section 5.2, we won't remove them, but we'll use the BN_LIKE_TYPES bitset to
// easily ignore them all from here on out.
// 3.3.3 X10
// Compute the set of isolating run sequences as specified by BD13
const levelRuns = []
let currentRun = null
let isolationLevel = 0
for (let i = paragraph.start; i <= paragraph.end; i++) {
const charType = charTypes[i]
if (!(charType & BN_LIKE_TYPES)) {
const lvl = embedLevels[i]
const isIsolInit = charType & ISOLATE_INIT_TYPES
const isPDI = charType === TYPE_PDI
if (isIsolInit) {
isolationLevel++
}
if (currentRun && lvl === currentRun._level) {
currentRun._end = i
currentRun._endsWithIsolInit = isIsolInit
} else {
levelRuns.push(currentRun = {
_start: i,
_end: i,
_level: lvl,
_startsWithPDI: isPDI,
_endsWithIsolInit: isIsolInit
})
}
if (isPDI) {
isolationLevel--
}
}
}
const isolatingRunSeqs = [] // [{seqIndices: [], sosType: L|R, eosType: L|R}]
for (let runIdx = 0; runIdx < levelRuns.length; runIdx++) {
const run = levelRuns[runIdx]
if (!run._startsWithPDI || (run._startsWithPDI && !isolationPairs.has(run._start))) {
const seqRuns = [currentRun = run]
for (let pdiIndex; currentRun && currentRun._endsWithIsolInit && (pdiIndex = isolationPairs.get(currentRun._end)) != null;) {
for (let i = runIdx + 1; i < levelRuns.length; i++) {
if (levelRuns[i]._start === pdiIndex) {
seqRuns.push(currentRun = levelRuns[i])
break
}
}
}
// build flat list of indices across all runs:
const seqIndices = []
for (let i = 0; i < seqRuns.length; i++) {
const run = seqRuns[i]
for (let j = run._start; j <= run._end; j++) {
seqIndices.push(j)
}
}
// determine the sos/eos types:
let firstLevel = embedLevels[seqIndices[0]]
let prevLevel = paragraph.level
for (let i = seqIndices[0] - 1; i >= 0; i--) {
if (!(charTypes[i] & BN_LIKE_TYPES)) { //5.2
prevLevel = embedLevels[i]
break
}
}
const lastIndex = seqIndices[seqIndices.length - 1]
let lastLevel = embedLevels[lastIndex]
let nextLevel = paragraph.level
if (!(charTypes[lastIndex] & ISOLATE_INIT_TYPES)) {
for (let i = lastIndex + 1; i <= paragraph.end; i++) {
if (!(charTypes[i] & BN_LIKE_TYPES)) { //5.2
nextLevel = embedLevels[i]
break
}
}
}
isolatingRunSeqs.push({
_seqIndices: seqIndices,
_sosType: Math.max(prevLevel, firstLevel) % 2 ? TYPE_R : TYPE_L,
_eosType: Math.max(nextLevel, lastLevel) % 2 ? TYPE_R : TYPE_L
})
}
}
// The next steps are done per isolating run sequence
for (let seqIdx = 0; seqIdx < isolatingRunSeqs.length; seqIdx++) {
const { _seqIndices: seqIndices, _sosType: sosType, _eosType: eosType } = isolatingRunSeqs[seqIdx]
/**
* All the level runs in an isolating run sequence have the same embedding level.
*
* DO NOT change any `embedLevels[i]` within the current scope.
*/
const embedDirection = ((embedLevels[seqIndices[0]]) & 1) ? TYPE_R : TYPE_L;
// === 3.3.4 Resolving Weak Types ===
// W1 + 5.2. Search backward from each NSM to the first character in the isolating run sequence whose
// bidirectional type is not BN, and set the NSM to ON if it is an isolate initiator or PDI, and to its
// type otherwise. If the NSM is the first non-BN character, change the NSM to the type of sos.
if (charTypeCounts.get(TYPE_NSM)) {
for (let si = 0; si < seqIndices.length; si++) {
const i = seqIndices[si]
if (charTypes[i] & TYPE_NSM) {
let prevType = sosType
for (let sj = si - 1; sj >= 0; sj--) {
if (!(charTypes[seqIndices[sj]] & BN_LIKE_TYPES)) { //5.2 scan back to first non-BN
prevType = charTypes[seqIndices[sj]]
break
}
}
changeCharType(i, (prevType & (ISOLATE_INIT_TYPES | TYPE_PDI)) ? TYPE_ON : prevType)
}
}
}
// W2. Search backward from each instance of a European number until the first strong type (R, L, AL, or sos)
// is found. If an AL is found, change the type of the European number to Arabic number.
if (charTypeCounts.get(TYPE_EN)) {
for (let si = 0; si < seqIndices.length; si++) {
const i = seqIndices[si]
if (charTypes[i] & TYPE_EN) {
for (let sj = si - 1; sj >= -1; sj--) {
const prevCharType = sj === -1 ? sosType : charTypes[seqIndices[sj]]
if (prevCharType & STRONG_TYPES) {
if (prevCharType === TYPE_AL) {
changeCharType(i, TYPE_AN)
}
break
}
}
}
}
}
// W3. Change all ALs to R
if (charTypeCounts.get(TYPE_AL)) {
for (let si = 0; si < seqIndices.length; si++) {
const i = seqIndices[si]
if (charTypes[i] & TYPE_AL) {
changeCharType(i, TYPE_R)
}
}
}
// W4. A single European separator between two European numbers changes to a European number. A single common
// separator between two numbers of the same type changes to that type.
if (charTypeCounts.get(TYPE_ES) || charTypeCounts.get(TYPE_CS)) {
for (let si = 1; si < seqIndices.length - 1; si++) {
const i = seqIndices[si]
if (charTypes[i] & (TYPE_ES | TYPE_CS)) {
let prevType = 0, nextType = 0
for (let sj = si - 1; sj >= 0; sj--) {
prevType = charTypes[seqIndices[sj]]
if (!(prevType & BN_LIKE_TYPES)) { //5.2
break
}
}
for (let sj = si + 1; sj < seqIndices.length; sj++) {
nextType = charTypes[seqIndices[sj]]
if (!(nextType & BN_LIKE_TYPES)) { //5.2
break
}
}
if (prevType === nextType && (charTypes[i] === TYPE_ES ? prevType === TYPE_EN : (prevType & (TYPE_EN | TYPE_AN)))) {
changeCharType(i, prevType)
}
}
}
}
// W5. A sequence of European terminators adjacent to European numbers changes to all European numbers.
if (charTypeCounts.get(TYPE_EN)) {
for (let si = 0; si < seqIndices.length; si++) {
const i = seqIndices[si]
if (charTypes[i] & TYPE_EN) {
for (let sj = si - 1; sj >= 0 && (charTypes[seqIndices[sj]] & (TYPE_ET | BN_LIKE_TYPES)); sj--) {
changeCharType(seqIndices[sj], TYPE_EN)
}
for (si++; si < seqIndices.length && (charTypes[seqIndices[si]] & (TYPE_ET | BN_LIKE_TYPES | TYPE_EN)); si++) {
if (charTypes[seqIndices[si]] !== TYPE_EN) {
changeCharType(seqIndices[si], TYPE_EN)
}
}
}
}
}
// W6. Otherwise, separators and terminators change to Other Neutral.
if (charTypeCounts.get(TYPE_ET) || charTypeCounts.get(TYPE_ES) || charTypeCounts.get(TYPE_CS)) {
for (let si = 0; si < seqIndices.length; si++) {
const i = seqIndices[si]
if (charTypes[i] & (TYPE_ET | TYPE_ES | TYPE_CS)) {
changeCharType(i, TYPE_ON)
// 5.2 transform adjacent BNs too:
for (let sj = si - 1; sj >= 0 && (charTypes[seqIndices[sj]] & BN_LIKE_TYPES); sj--) {
changeCharType(seqIndices[sj], TYPE_ON)
}
for (let sj = si + 1; sj < seqIndices.length && (charTypes[seqIndices[sj]] & BN_LIKE_TYPES); sj++) {
changeCharType(seqIndices[sj], TYPE_ON)
}
}
}
}
// W7. Search backward from each instance of a European number until the first strong type (R, L, or sos)
// is found. If an L is found, then change the type of the European number to L.
// NOTE: implemented in single forward pass for efficiency
if (charTypeCounts.get(TYPE_EN)) {
for (let si = 0, prevStrongType = sosType; si < seqIndices.length; si++) {
const i = seqIndices[si]
const type = charTypes[i]
if (type & TYPE_EN) {
if (prevStrongType === TYPE_L) {
changeCharType(i, TYPE_L)
}
} else if (type & STRONG_TYPES) {
prevStrongType = type
}
}
}
// === 3.3.5 Resolving Neutral and Isolate Formatting Types ===
if (charTypeCounts.get(NEUTRAL_ISOLATE_TYPES)) {
// N0. Process bracket pairs in an isolating run sequence sequentially in the logical order of the text
// positions of the opening paired brackets using the logic given below. Within this scope, bidirectional
// types EN and AN are treated as R.
const R_TYPES_FOR_N_STEPS = (TYPE_R | TYPE_EN | TYPE_AN)
const STRONG_TYPES_FOR_N_STEPS = R_TYPES_FOR_N_STEPS | TYPE_L
// * Identify the bracket pairs in the current isolating run sequence according to BD16.
const bracketPairs = []
{
const openerStack = []
for (let si = 0; si < seqIndices.length; si++) {
// NOTE: for any potential bracket character we also test that it still carries a NI
// type, as that may have been changed earlier. This doesn't seem to be explicitly
// called out in the spec, but is required for passage of certain tests.
if (charTypes[seqIndices[si]] & NEUTRAL_ISOLATE_TYPES) {
const char = string[seqIndices[si]]
let oppositeBracket
// Opening bracket
if (openingToClosingBracket(char) !== null) {
if (openerStack.length < 63) {
openerStack.push({ char, seqIndex: si })
} else {
break
}
}
// Closing bracket
else if ((oppositeBracket = closingToOpeningBracket(char)) !== null) {
for (let stackIdx = openerStack.length - 1; stackIdx >= 0; stackIdx--) {
const stackChar = openerStack[stackIdx].char
if (stackChar === oppositeBracket ||
stackChar === closingToOpeningBracket(getCanonicalBracket(char)) ||
openingToClosingBracket(getCanonicalBracket(stackChar)) === char
) {
bracketPairs.push([openerStack[stackIdx].seqIndex, si])
openerStack.length = stackIdx //pop the matching bracket and all following
break
}
}
}
}
}
bracketPairs.sort((a, b) => a[0] - b[0])
}
// * For each bracket-pair element in the list of pairs of text positions
for (let pairIdx = 0; pairIdx < bracketPairs.length; pairIdx++) {
const [openSeqIdx, closeSeqIdx] = bracketPairs[pairIdx]
// a. Inspect the bidirectional types of the characters enclosed within the bracket pair.
// b. If any strong type (either L or R) matching the embedding direction is found, set the type for both
// brackets in the pair to match the embedding direction.
let foundStrongType = false
let useStrongType = 0
for (let si = openSeqIdx + 1; si < closeSeqIdx; si++) {
const i = seqIndices[si]
if (charTypes[i] & STRONG_TYPES_FOR_N_STEPS) {
foundStrongType = true
const lr = (charTypes[i] & R_TYPES_FOR_N_STEPS) ? TYPE_R : TYPE_L
if (lr === embedDirection) {
useStrongType = lr
break
}
}
}
// c. Otherwise, if there is a strong type it must be opposite the embedding direction. Therefore, test
// for an established context with a preceding strong type by checking backwards before the opening paired
// bracket until the first strong type (L, R, or sos) is found.
// 1. If the preceding strong type is also opposite the embedding direction, context is established, so
// set the type for both brackets in the pair to that direction.
// 2. Otherwise set the type for both brackets in the pair to the embedding direction.
if (foundStrongType && !useStrongType) {
useStrongType = sosType
for (let si = openSeqIdx - 1; si >= 0; si--) {
const i = seqIndices[si]
if (charTypes[i] & STRONG_TYPES_FOR_N_STEPS) {
const lr = (charTypes[i] & R_TYPES_FOR_N_STEPS) ? TYPE_R : TYPE_L
if (lr !== embedDirection) {
useStrongType = lr
} else {
useStrongType = embedDirection
}
break
}
}
}
if (useStrongType) {
charTypes[seqIndices[openSeqIdx]] = charTypes[seqIndices[closeSeqIdx]] = useStrongType
// * Any number of characters that had original bidirectional character type NSM prior to the application
// of W1 that immediately follow a paired bracket which changed to L or R under N0 should change to match
// the type of their preceding bracket.
if (useStrongType !== embedDirection) {
for (let si = openSeqIdx + 1; si < seqIndices.length; si++) {
if (!(charTypes[seqIndices[si]] & BN_LIKE_TYPES)) {
if (getBidiCharType(string[seqIndices[si]]) & TYPE_NSM) {
charTypes[seqIndices[si]] = useStrongType
}
break
}
}
}
if (useStrongType !== embedDirection) {
for (let si = closeSeqIdx + 1; si < seqIndices.length; si++) {
if (!(charTypes[seqIndices[si]] & BN_LIKE_TYPES)) {
if (getBidiCharType(string[seqIndices[si]]) & TYPE_NSM) {
charTypes[seqIndices[si]] = useStrongType
}
break
}
}
}
}
}
// N1. A sequence of NIs takes the direction of the surrounding strong text if the text on both sides has the
// same direction.
// N2. Any remaining NIs take the embedding direction.
for (let si = 0; si < seqIndices.length; si++) {
if (charTypes[seqIndices[si]] & NEUTRAL_ISOLATE_TYPES) {
let niRunStart = si, niRunEnd = si
let prevType = sosType //si === 0 ? sosType : (charTypes[seqIndices[si - 1]] & R_TYPES_FOR_N_STEPS) ? TYPE_R : TYPE_L
for (let si2 = si - 1; si2 >= 0; si2--) {
if (charTypes[seqIndices[si2]] & BN_LIKE_TYPES) {
niRunStart = si2 //5.2 treat BNs adjacent to NIs as NIs
} else {
prevType = (charTypes[seqIndices[si2]] & R_TYPES_FOR_N_STEPS) ? TYPE_R : TYPE_L
break
}
}
let nextType = eosType
for (let si2 = si + 1; si2 < seqIndices.length; si2++) {
if (charTypes[seqIndices[si2]] & (NEUTRAL_ISOLATE_TYPES | BN_LIKE_TYPES)) {
niRunEnd = si2
} else {
nextType = (charTypes[seqIndices[si2]] & R_TYPES_FOR_N_STEPS) ? TYPE_R : TYPE_L
break
}
}
for (let sj = niRunStart; sj <= niRunEnd; sj++) {
charTypes[seqIndices[sj]] = prevType === nextType ? prevType : embedDirection
}
si = niRunEnd
}
}
}
}
// === 3.3.6 Resolving Implicit Levels ===
for (let i = paragraph.start; i <= paragraph.end; i++) {
const level = embedLevels[i]
const type = charTypes[i]
// I2. For all characters with an odd (right-to-left) embedding level, those of type L, EN or AN go up one level.
if (level & 1) {
if (type & (TYPE_L | TYPE_EN | TYPE_AN)) {
embedLevels[i]++
}
}
// I1. For all characters with an even (left-to-right) embedding level, those of type R go up one level
// and those of type AN or EN go up two levels.
else {
if (type & TYPE_R) {
embedLevels[i]++
} else if (type & (TYPE_AN | TYPE_EN)) {
embedLevels[i] += 2
}
}
// 5.2: Resolve any LRE, RLE, LRO, RLO, PDF, or BN to the level of the preceding character if there is one,
// and otherwise to the base level.
if (type & BN_LIKE_TYPES) {
embedLevels[i] = i === 0 ? paragraph.level : embedLevels[i - 1]
}
// 3.4 L1.1-4: Reset the embedding level of segment/paragraph separators, and any sequence of whitespace or
// isolate formatting characters preceding them or the end of the paragraph, to the paragraph level.
// NOTE: this will also need to be applied to each individual line ending after line wrapping occurs.
if (i === paragraph.end || getBidiCharType(string[i]) & (TYPE_S | TYPE_B)) {
for (let j = i; j >= 0 && (getBidiCharType(string[j]) & TRAILING_TYPES); j--) {
embedLevels[j] = paragraph.level
}
}
}
}
// DONE! The resolved levels can then be used, after line wrapping, to flip runs of characters
// according to section 3.4 Reordering Resolved Levels
return {
levels: embedLevels,
paragraphs
}
function determineAutoEmbedLevel (start, isFSI) {
// 3.3.1 P2 - P3
for (let i = start; i < string.length; i++) {
const charType = charTypes[i]
if (charType & (TYPE_R | TYPE_AL)) {
return 1
}
if ((charType & (TYPE_B | TYPE_L)) || (isFSI && charType === TYPE_PDI)) {
return 0
}
if (charType & ISOLATE_INIT_TYPES) {
const pdi = indexOfMatchingPDI(i)
i = pdi === -1 ? string.length : pdi
}
}
return 0
}
function indexOfMatchingPDI (isolateStart) {
// 3.1.2 BD9
let isolationLevel = 1
for (let i = isolateStart + 1; i < string.length; i++) {
const charType = charTypes[i]
if (charType & TYPE_B) {
break
}
if (charType & TYPE_PDI) {
if (--isolationLevel === 0) {
return i
}
} else if (charType & ISOLATE_INIT_TYPES) {
isolationLevel++
}
}
return -1
}
}
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