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feat: F4.6f2 the text editor on the document's Y.Text, files both ways while the simulation runs

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Oracle TextEditorWindowRun uses Java's text editor window and its file
dialog as a person does. The open file's text is its Y.Text in the
document (plan 7.3): typed is in the file at once, for everyone and for
the running engine. Core openText/saveTextAs without Java's mistakes
(lost saves after save-as onto a file or a removed file, files named
'ordner/d.txt' or ''); doc files.ts (changeFiles, fileText, nodeFiles,
readFilesInto); the room takes a person's files into the engine at once
and writes the engine's files back at the tick they changed; the editor's
window, Java's dialog, the text area following others' changes with the
caret in place, its own undo.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
julian.kiedaisch
2026-10-03 17:50:27 +00:00
co-authored by Claude Opus 5.5
parent 3d6655e736
commit 2c7733b575
29 changed files with 3268 additions and 76 deletions
Download Patch File Download Diff File Expand all files Collapse all files
packages/doc/src/files.ts
+170
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@@ -0,0 +1,170 @@
// A device's files in the document (`files`: path → { order, kind, text |
// data, mediaType? }): read as the core's file system, changed through the
// core's operations (what the text editor's, and later the explorer's,
// buttons do), and the two ways between the document and a running engine —
// what a run wrote goes into the document (writeFiles, for writeRunState),
// what a person wrote meanwhile into the engine (readFilesInto). Only what
// differs is written either way, a text where it changed, so that what two
// write at once is kept (plan §7.3: the text editor's content is the
// document's Y.Text).
import * as Y from 'yjs';
import type { Id, VirtualFileContent, VirtualFileSystem } from '@mdg-filius/core';
import { VirtualFileSystem as FileSystem } from '@mdg-filius/core';
import { fileEntry, fileSystemOf, ROOTS } from './projectDoc.js';
export function sameBytes(left: Uint8Array, right: Uint8Array): boolean {
return left.length === right.length && left.every((byte, index) => byte === right[index]);
}
/** A text changed where it changed: the common start and end stay (and with them what another person typed there). */
export function replaceText(text: Y.Text, next: string): void {
const current = text.toString();
if (current === next) return;
let start = 0;
while (start < current.length && start < next.length && current[start] === next[start]) start += 1;
let end = 0;
while (end < current.length - start && end < next.length - start && current[current.length - 1 - end] === next[next.length - 1 - end]) end += 1;
if (current.length - start - end > 0) text.delete(start, current.length - start - end);
if (next.length - start - end > 0) text.insert(start, next.slice(start, next.length - end));
}
/** Whether a document entry holds the content. */
function holds(entry: Y.Map<unknown>, content: VirtualFileContent): boolean {
if (entry.get('kind') !== content.kind) return false;
if (content.kind === 'directory' || content.kind === 'text') return true;
return sameBytes(entry.get('data') as Uint8Array, content.data) && entry.get('mediaType') === content.mediaType;
}
/** A node's files as the file system has them: new ones after the others, changed ones in their place, gone ones removed. */
export function writeFiles(node: Y.Map<unknown>, fileSystem: VirtualFileSystem): void {
let files = node.get('files') as Y.Map<Y.Map<unknown>> | undefined;
const wanted: [string, VirtualFileContent][] = [];
const walk = (folder: string): void => {
for (const entry of fileSystem.entriesInCreationOrder(folder)) {
wanted.push([entry.path, entry.content]);
if (entry.content.kind === 'directory') walk(entry.path);
}
};
walk('/');
if (files === undefined) {
if (wanted.length === 0) return;
files = new Y.Map<Y.Map<unknown>>();
node.set('files', files);
}
const paths = new Set(wanted.map(([path]) => path));
for (const path of [...files.keys()]) if (!paths.has(path)) files.delete(path);
let order = Math.max(-1, ...[...files.values()].map((entry) => entry.get('order') as number)) + 1;
for (const [path, content] of wanted) {
const entry = files.get(path);
if (entry === undefined) {
files.set(path, fileEntry(order++, content));
} else if (!holds(entry, content)) {
files.set(path, fileEntry(entry.get('order') as number, content));
} else if (content.kind === 'text') {
replaceText(entry.get('text') as Y.Text, content.text);
}
}
}
function nodeMap(doc: Y.Doc, id: Id): Y.Map<unknown> | undefined {
return doc.getMap<Y.Map<unknown>>(ROOTS.nodes).get(id);
}
/** A device's files as the core's file system; none for a device the document does not have. */
export function nodeFiles(doc: Y.Doc, id: Id): VirtualFileSystem | undefined {
const node = nodeMap(doc, id);
if (node === undefined) return undefined;
const files = node.get('files') as Y.Map<Y.Map<unknown>> | undefined;
return files === undefined ? new FileSystem() : fileSystemOf(files);
}
/**
* Changes a device's files through the core's operations (filePrograms): the
* change gets them as a file system, and what it changed is written into
* the document, in one transaction with the origin. What the change
* returned; undefined for a device the document does not have.
*/
export function changeFiles<T>(doc: Y.Doc, id: Id, origin: unknown, change: (files: VirtualFileSystem) => T): T | undefined {
const node = nodeMap(doc, id);
const files = nodeFiles(doc, id);
if (node === undefined || files === undefined) return undefined;
const result = change(files);
// What did not change writes nothing (writeFiles writes what differs only).
doc.transact(() => writeFiles(node, files), origin);
return result;
}
/** A text file's text in the document, the entry found in any case; none when there is no text file at the path. */
export function fileText(doc: Y.Doc, id: Id, path: string): Y.Text | undefined {
const files = nodeMap(doc, id)?.get('files') as Y.Map<Y.Map<unknown>> | undefined;
if (files === undefined) return undefined;
const lower = path.toLowerCase();
const entry = files.get(path) ?? [...files.entries()].find(([key]) => key.toLowerCase() === lower)?.[1];
// Only a text file's entry has a text.
return entry?.get('text') as Y.Text | undefined;
}
/**
* The document's files of a device into a file system (a running engine's):
* what differs only, an entry the document no longer has removed, a new one
* after the others; when a file turned into a folder or back, all anew in the
* document's order (the command line lists them so). Read tolerantly, as fileSystemOf: an entry the file
* system refuses is left out. Whether anything changed.
*/
export function readFilesInto(doc: Y.Doc, id: Id, fileSystem: VirtualFileSystem): boolean {
const node = nodeMap(doc, id);
if (node === undefined) return false;
const revision = fileSystem.revision;
const wanted = fileSystemOf((node.get('files') as Y.Map<Y.Map<unknown>> | undefined) ?? new Y.Map());
// By their spelling: a name changed only in case is the entry anew.
const kept = new Set(wanted.allEntries().map((entry) => entry.path));
// Deepest first, so that a folder's entries go before it.
for (const entry of fileSystem.allEntries().reverse()) {
if (entry.path !== '/' && !kept.has(entry.path)) fileSystem.deleteItem(entry.path, true);
}
const walk = (folder: string): void => {
for (const { path, content } of wanted.entriesInCreationOrder(folder)) {
const have = fileSystem.contains(path) ? fileSystem.entry(path).content : undefined;
if (have === undefined || !sameContent(have, content)) {
try {
// A folder for a file, or a file for a folder: the old one goes first.
if (have !== undefined && (have.kind === 'directory' || content.kind === 'directory')) fileSystem.deleteItem(path, true);
write(fileSystem, path, content);
} catch {
// Left out (see above).
}
}
if (content.kind === 'directory') walk(path);
}
};
walk('/');
// A file turned into a folder, or a folder into a file, came in after the others: built anew in the document's order.
if (preorder(fileSystem).join('\n') !== preorder(wanted).join('\n')) {
for (const entry of fileSystem.entriesInCreationOrder('/')) fileSystem.deleteItem(entry.path, true);
for (const path of preorder(wanted)) write(fileSystem, path, wanted.entry(path).content);
}
return fileSystem.revision !== revision;
}
/** Every entry's path, each folder's entries in the order they were made after the folder. */
function preorder(fileSystem: VirtualFileSystem): string[] {
return fileSystem.entriesInCreationOrder('/').flatMap(function below(entry): string[] {
return [entry.path, ...(entry.content.kind === 'directory' ? fileSystem.entriesInCreationOrder(entry.path).flatMap(below) : [])];
});
}
function write(fileSystem: VirtualFileSystem, path: string, content: VirtualFileContent): void {
if (content.kind === 'directory') fileSystem.createDirectory(path);
else if (content.kind === 'text') fileSystem.writeTextFile(path, content.text);
else if (content.kind === 'image') fileSystem.writeImageFile(path, content.data, content.mediaType);
else fileSystem.writeBinaryFile(path, content.data, content.mediaType);
}
function sameContent(left: VirtualFileContent, right: VirtualFileContent): boolean {
if (left.kind !== right.kind) return false;
if (left.kind === 'directory') return true;
if (left.kind === 'text') return left.text === (right as typeof left).text;
const other = right as typeof left;
return sameBytes(left.data, other.data) && left.mediaType === other.mediaType;
}
packages/doc/src/index.ts
+1
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@@ -1,6 +1,7 @@
// Public surface of the shared document.
export * from './commands.js';
export * from './fields.js';
export * from './files.js';
export * from './janitor.js';
export * from './projectDoc.js';
export * from './settings.js';
packages/doc/src/projectDoc.ts
+1 -1
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@@ -224,7 +224,7 @@ export function inOrder(map: Y.Map<Y.Map<unknown>>): [string, Y.Map<unknown>][]
* system refuses (its folder missing before the janitor ran, or a name two
* people gave at once in different case) is left out, not the project.
*/
function fileSystemOf(files: Y.Map<Y.Map<unknown>>): VirtualFileSystem {
export function fileSystemOf(files: Y.Map<Y.Map<unknown>>): VirtualFileSystem {
const fileSystem = new VirtualFileSystem();
for (const [path, entry] of inOrder(files)) {
const kind = entry.get('kind') as VirtualFileContent['kind'];
packages/doc/src/simulation.ts
+3 -56
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@@ -9,8 +9,9 @@
// the second time and a text edited meanwhile keeps what it did not touch.
import * as Y from 'yjs';
import type { Id, InstallableProgram, VirtualFileContent, VirtualFileSystem } from '@mdg-filius/core';
import { fileEntry, NODE_SETTINGS, ROOTS } from './projectDoc.js';
import type { Id, InstallableProgram, VirtualFileSystem } from '@mdg-filius/core';
import { sameBytes, writeFiles } from './files.js';
import { NODE_SETTINGS, ROOTS } from './projectDoc.js';
export { emailServerAfterRun } from '@mdg-filius/fls';
import { fromY, toY, type PlainValue } from './values.js';
@@ -43,60 +44,6 @@ function same(left: unknown, right: unknown): boolean {
return left === right;
}
function sameBytes(left: Uint8Array, right: Uint8Array): boolean {
return left.length === right.length && left.every((byte, index) => byte === right[index]);
}
/** A text changed where it changed: the common start and end stay (and with them what another person typed there). */
function replaceText(text: Y.Text, next: string): void {
const current = text.toString();
if (current === next) return;
let start = 0;
while (start < current.length && start < next.length && current[start] === next[start]) start += 1;
let end = 0;
while (end < current.length - start && end < next.length - start && current[current.length - 1 - end] === next[next.length - 1 - end]) end += 1;
if (current.length - start - end > 0) text.delete(start, current.length - start - end);
if (next.length - start - end > 0) text.insert(start, next.slice(start, next.length - end));
}
/** Whether a document entry holds the content. */
function holds(entry: Y.Map<unknown>, content: VirtualFileContent): boolean {
if (entry.get('kind') !== content.kind) return false;
if (content.kind === 'directory' || content.kind === 'text') return true;
return sameBytes(entry.get('data') as Uint8Array, content.data) && entry.get('mediaType') === content.mediaType;
}
/** A node's files as the run left them: new ones after the others, changed ones in their place, gone ones removed. */
function writeFiles(node: Y.Map<unknown>, fileSystem: VirtualFileSystem): void {
let files = node.get('files') as Y.Map<Y.Map<unknown>> | undefined;
const wanted: [string, VirtualFileContent][] = [];
const walk = (folder: string): void => {
for (const entry of fileSystem.entriesInCreationOrder(folder)) {
wanted.push([entry.path, entry.content]);
if (entry.content.kind === 'directory') walk(entry.path);
}
};
walk('/');
if (files === undefined) {
if (wanted.length === 0) return;
files = new Y.Map<Y.Map<unknown>>();
node.set('files', files);
}
const paths = new Set(wanted.map(([path]) => path));
for (const path of [...files.keys()]) if (!paths.has(path)) files.delete(path);
let order = Math.max(-1, ...[...files.values()].map((entry) => entry.get('order') as number)) + 1;
for (const [path, content] of wanted) {
const entry = files.get(path);
if (entry === undefined) {
files.set(path, fileEntry(order++, content));
} else if (!holds(entry, content)) {
files.set(path, fileEntry(entry.get('order') as number, content));
} else if (content.kind === 'text') {
replaceText(entry.get('text') as Y.Text, content.text);
}
}
}
/** Writes what the runs left of the nodes, what differs only, in one transaction; nodes the document no longer has are left out. */
export function writeRunState(doc: Y.Doc, states: ReadonlyMap<Id, NodeRunState>, origin: unknown = SIM_ORIGIN): void {
const nodes = doc.getMap<Y.Map<unknown>>(ROOTS.nodes);