--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.cms/lib/codemirror/src/model/document_data.js	Fri Oct 11 22:40:23 2024 +0000
@@ -0,0 +1,112 @@
+import { loadMode } from "../display/mode_state.js"
+import { runInOp } from "../display/operations.js"
+import { regChange } from "../display/view_tracking.js"
+import { Line, updateLine } from "../line/line_data.js"
+import { findMaxLine } from "../line/spans.js"
+import { getLine } from "../line/utils_line.js"
+import { estimateLineHeights } from "../measurement/position_measurement.js"
+import { addClass, rmClass } from "../util/dom.js"
+import { lst } from "../util/misc.js"
+import { signalLater } from "../util/operation_group.js"
+
+// DOCUMENT DATA STRUCTURE
+
+// By default, updates that start and end at the beginning of a line
+// are treated specially, in order to make the association of line
+// widgets and marker elements with the text behave more intuitive.
+export function isWholeLineUpdate(doc, change) {
+  return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
+    (!doc.cm || doc.cm.options.wholeLineUpdateBefore)
+}
+
+// Perform a change on the document data structure.
+export function updateDoc(doc, change, markedSpans, estimateHeight) {
+  function spansFor(n) {return markedSpans ? markedSpans[n] : null}
+  function update(line, text, spans) {
+    updateLine(line, text, spans, estimateHeight)
+    signalLater(line, "change", line, change)
+  }
+  function linesFor(start, end) {
+    let result = []
+    for (let i = start; i < end; ++i)
+      result.push(new Line(text[i], spansFor(i), estimateHeight))
+    return result
+  }
+
+  let from = change.from, to = change.to, text = change.text
+  let firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line)
+  let lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line
+
+  // Adjust the line structure
+  if (change.full) {
+    doc.insert(0, linesFor(0, text.length))
+    doc.remove(text.length, doc.size - text.length)
+  } else if (isWholeLineUpdate(doc, change)) {
+    // This is a whole-line replace. Treated specially to make
+    // sure line objects move the way they are supposed to.
+    let added = linesFor(0, text.length - 1)
+    update(lastLine, lastLine.text, lastSpans)
+    if (nlines) doc.remove(from.line, nlines)
+    if (added.length) doc.insert(from.line, added)
+  } else if (firstLine == lastLine) {
+    if (text.length == 1) {
+      update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans)
+    } else {
+      let added = linesFor(1, text.length - 1)
+      added.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight))
+      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0))
+      doc.insert(from.line + 1, added)
+    }
+  } else if (text.length == 1) {
+    update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0))
+    doc.remove(from.line + 1, nlines)
+  } else {
+    update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0))
+    update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans)
+    let added = linesFor(1, text.length - 1)
+    if (nlines > 1) doc.remove(from.line + 1, nlines - 1)
+    doc.insert(from.line + 1, added)
+  }
+
+  signalLater(doc, "change", doc, change)
+}
+
+// Call f for all linked documents.
+export function linkedDocs(doc, f, sharedHistOnly) {
+  function propagate(doc, skip, sharedHist) {
+    if (doc.linked) for (let i = 0; i < doc.linked.length; ++i) {
+      let rel = doc.linked[i]
+      if (rel.doc == skip) continue
+      let shared = sharedHist && rel.sharedHist
+      if (sharedHistOnly && !shared) continue
+      f(rel.doc, shared)
+      propagate(rel.doc, doc, shared)
+    }
+  }
+  propagate(doc, null, true)
+}
+
+// Attach a document to an editor.
+export function attachDoc(cm, doc) {
+  if (doc.cm) throw new Error("This document is already in use.")
+  cm.doc = doc
+  doc.cm = cm
+  estimateLineHeights(cm)
+  loadMode(cm)
+  setDirectionClass(cm)
+  cm.options.direction = doc.direction
+  if (!cm.options.lineWrapping) findMaxLine(cm)
+  cm.options.mode = doc.modeOption
+  regChange(cm)
+}
+
+function setDirectionClass(cm) {
+  ;(cm.doc.direction == "rtl" ? addClass : rmClass)(cm.display.lineDiv, "CodeMirror-rtl")
+}
+
+export function directionChanged(cm) {
+  runInOp(cm, () => {
+    setDirectionClass(cm)
+    regChange(cm)
+  })
+}