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Viewing file:     utils_line.js (2.51 KB)      -rw-r--r--

import { indexOf } from "../util/misc.js"

// Find the line object corresponding to the given line number.
export function getLine(doc, n) {
  n -= doc.first
  if (n < 0 || n >= doc.size) throw new Error("There is no line " + (n + doc.first) + " in the document.")
  let chunk = doc
  while (!chunk.lines) {
    for (let i = 0;; ++i) {
      let child = chunk.children[i], sz = child.chunkSize()
      if (n < sz) { chunk = child; break }
      n -= sz
    }
  }
  return chunk.lines[n]
}

// Get the part of a document between two positions, as an array of
// strings.
export function getBetween(doc, start, end) {
  let out = [], n = start.line
  doc.iter(start.line, end.line + 1, line => {
    let text = line.text
    if (n == end.line) text = text.slice(0, end.ch)
    if (n == start.line) text = text.slice(start.ch)
    out.push(text)
    ++n
  })
  return out
}
// Get the lines between from and to, as array of strings.
export function getLines(doc, from, to) {
  let out = []
  doc.iter(from, to, line => { out.push(line.text) }) // iter aborts when callback returns truthy value
  return out
}

// Update the height of a line, propagating the height change
// upwards to parent nodes.
export function updateLineHeight(line, height) {
  let diff = height - line.height
  if (diff) for (let n = line; n; n = n.parent) n.height += diff
}

// Given a line object, find its line number by walking up through
// its parent links.
export function lineNo(line) {
  if (line.parent == null) return null
  let cur = line.parent, no = indexOf(cur.lines, line)
  for (let chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
    for (let i = 0;; ++i) {
      if (chunk.children[i] == cur) break
      no += chunk.children[i].chunkSize()
    }
  }
  return no + cur.first
}

// Find the line at the given vertical position, using the height
// information in the document tree.
export function lineAtHeight(chunk, h) {
  let n = chunk.first
  outer: do {
    for (let i = 0; i < chunk.children.length; ++i) {
      let child = chunk.children[i], ch = child.height
      if (h < ch) { chunk = child; continue outer }
      h -= ch
      n += child.chunkSize()
    }
    return n
  } while (!chunk.lines)
  let i = 0
  for (; i < chunk.lines.length; ++i) {
    let line = chunk.lines[i], lh = line.height
    if (h < lh) break
    h -= lh
  }
  return n + i
}

export function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size}

export function lineNumberFor(options, i) {
  return String(options.lineNumberFormatter(i + options.firstLineNumber))
}