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- 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)
- })
- }
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