General.Web/wwwroot/lib/codemirror-5.31.0/src/util/bidi.js

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import { lst } from "./misc"

// BIDI HELPERS

export function iterateBidiSections(order, from, to, f) {
  if (!order) return f(from, to, "ltr", 0)
  let found = false
  for (let i = 0; i < order.length; ++i) {
    let part = order[i]
    if (part.from < to && part.to > from || from == to && part.to == from) {
      f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr", i)
      found = true
    }
  }
  if (!found) f(from, to, "ltr")
}

export let bidiOther = null
export function getBidiPartAt(order, ch, sticky) {
  let found
  bidiOther = null
  for (let i = 0; i < order.length; ++i) {
    let cur = order[i]
    if (cur.from < ch && cur.to > ch) return i
    if (cur.to == ch) {
      if (cur.from != cur.to && sticky == "before") found = i
      else bidiOther = i
    }
    if (cur.from == ch) {
      if (cur.from != cur.to && sticky != "before") found = i
      else bidiOther = i
    }
  }
  return found != null ? found : bidiOther
}

// Bidirectional ordering algorithm
// See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
// that this (partially) implements.

// One-char codes used for character types:
// L (L):   Left-to-Right
// R (R):   Right-to-Left
// r (AL):  Right-to-Left Arabic
// 1 (EN):  European Number
// + (ES):  European Number Separator
// % (ET):  European Number Terminator
// n (AN):  Arabic Number
// , (CS):  Common Number Separator
// m (NSM): Non-Spacing Mark
// b (BN):  Boundary Neutral
// s (B):   Paragraph Separator
// t (S):   Segment Separator
// w (WS):  Whitespace
// N (ON):  Other Neutrals

// Returns null if characters are ordered as they appear
// (left-to-right), or an array of sections ({from, to, level}
// objects) in the order in which they occur visually.
let bidiOrdering = (function() {