General.Web/wwwroot/lib/codemirror-5.31.0/src/model/chunk.js

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import { cleanUpLine } from "../line/line_data"
import { indexOf } from "../util/misc"
import { signalLater } from "../util/operation_group"

// The document is represented as a BTree consisting of leaves, with
// chunk of lines in them, and branches, with up to ten leaves or
// other branch nodes below them. The top node is always a branch
// node, and is the document object itself (meaning it has
// additional methods and properties).
//
// All nodes have parent links. The tree is used both to go from
// line numbers to line objects, and to go from objects to numbers.
// It also indexes by height, and is used to convert between height
// and line object, and to find the total height of the document.
//
// See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html

export function LeafChunk(lines) {
  this.lines = lines
  this.parent = null
  let height = 0
  for (let i = 0; i < lines.length; ++i) {
    lines[i].parent = this
    height += lines[i].height
  }
  this.height = height
}

LeafChunk.prototype = {
  chunkSize() { return this.lines.length },

  // Remove the n lines at offset 'at'.
  removeInner(at, n) {
    for (let i = at, e = at + n; i < e; ++i) {
      let line = this.lines[i]
      this.height -= line.height
      cleanUpLine(line)
      signalLater(line, "delete")
    }
    this.lines.splice(at, n)
  },

  // Helper used to collapse a small branch into a single leaf.
  collapse(lines) {
    lines.push.apply(lines, this.lines)
  },

  // Insert the given array of lines at offset 'at', count them as
  // having the given height.
  insertInner(at, lines, height) {
    this.height += height
    this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at))
    for (let i = 0; i < lines.length; ++i) lines[i].parent = this
  },

  // Used to iterate over a part of the tree.
  iterN(at, n, op) {
    for (let e = at + n; at < e; ++at)
      if (op(this.lines[at])) return true
  }