General.Web/wwwroot/lib/codemirror-5.31.0/src/display/update_line.js

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import { buildLineContent } from "../line/line_data"
import { lineNumberFor } from "../line/utils_line"
import { ie, ie_version } from "../util/browser"
import { elt } from "../util/dom"
import { signalLater } from "../util/operation_group"

// When an aspect of a line changes, a string is added to
// lineView.changes. This updates the relevant part of the line's
// DOM structure.
export function updateLineForChanges(cm, lineView, lineN, dims) {
  for (let j = 0; j < lineView.changes.length; j++) {
    let type = lineView.changes[j]
    if (type == "text") updateLineText(cm, lineView)
    else if (type == "gutter") updateLineGutter(cm, lineView, lineN, dims)
    else if (type == "class") updateLineClasses(cm, lineView)
    else if (type == "widget") updateLineWidgets(cm, lineView, dims)
  }
  lineView.changes = null
}

// Lines with gutter elements, widgets or a background class need to
// be wrapped, and have the extra elements added to the wrapper div
function ensureLineWrapped(lineView) {
  if (lineView.node == lineView.text) {
    lineView.node = elt("div", null, null, "position: relative")
    if (lineView.text.parentNode)
      lineView.text.parentNode.replaceChild(lineView.node, lineView.text)
    lineView.node.appendChild(lineView.text)
    if (ie && ie_version < 8) lineView.node.style.zIndex = 2
  }
  return lineView.node
}

function updateLineBackground(cm, lineView) {
  let cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass
  if (cls) cls += " CodeMirror-linebackground"
  if (lineView.background) {
    if (cls) lineView.background.className = cls
    else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null }
  } else if (cls) {
    let wrap = ensureLineWrapped(lineView)
    lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild)
    cm.display.input.setUneditable(lineView.background)
  }
}

// Wrapper around buildLineContent which will reuse the structure
// in display.externalMeasured when possible.
function getLineContent(cm, lineView) {
  let ext = cm.display.externalMeasured
  if (ext && ext.line == lineView.line) {
    cm.display.externalMeasured = null
    lineView.measure = ext.measure
    return ext.built
  }
  return buildLineContent(cm, lineView)
}

// Redraw the line's text. Interacts with the background and text
// classes because the mode may output tokens that influence these
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