mirror of
https://github.com/laurent22/joplin.git
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412 lines
12 KiB
TypeScript
412 lines
12 KiB
TypeScript
import { EditorView, ViewPlugin, ViewUpdate, showPanel } from '@codemirror/view';
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import { Extension, Text, Transaction } from '@codemirror/state';
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import getScrollFraction from '../getScrollFraction';
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import { CodeMirror as BaseCodeMirror5Emulation, Vim } from '@replit/codemirror-vim';
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import { LogMessageCallback } from '../../types';
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import editorCommands from '../editorCommands/editorCommands';
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import { StateEffect } from '@codemirror/state';
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import { StreamParser } from '@codemirror/language';
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import Decorator, { LineWidgetOptions } from './Decorator';
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const { pregQuote } = require('@joplin/lib/string-utils-common');
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type CodeMirror5Command = (codeMirror: CodeMirror5Emulation)=> void;
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type EditorEventCallback = (editor: CodeMirror5Emulation, ...args: any[])=> void;
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type OptionUpdateCallback = (editor: CodeMirror5Emulation, newVal: any, oldVal: any)=> void;
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interface CodeMirror5OptionRecord {
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onUpdate: OptionUpdateCallback;
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value: any;
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}
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interface DocumentPosition {
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line: number;
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ch: number;
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}
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const documentPositionFromPos = (doc: Text, pos: number): DocumentPosition => {
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const line = doc.lineAt(pos);
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return {
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// CM 5 uses 0-based line numbering
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line: line.number - 1,
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ch: pos - line.from,
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};
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};
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export default class CodeMirror5Emulation extends BaseCodeMirror5Emulation {
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private _events: Record<string, EditorEventCallback[]> = {};
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private _options: Record<string, CodeMirror5OptionRecord> = Object.create(null);
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private _decorator: Decorator;
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private _decoratorExtension: Extension;
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// Used by some plugins to store state.
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public state: Record<string, any> = Object.create(null);
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public Vim = Vim;
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// Passed as initial state to plugins
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public Init = { toString: () => 'CodeMirror.Init' };
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public constructor(
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public editor: EditorView,
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private logMessage: LogMessageCallback,
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) {
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super(editor);
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const { decorator, extension: decoratorExtension } = Decorator.create(editor);
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this._decorator = decorator;
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this._decoratorExtension = decoratorExtension;
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editor.dispatch({
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effects: StateEffect.appendConfig.of(this.makeCM6Extensions()),
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});
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}
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private makeCM6Extensions() {
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const cm5 = this;
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const editor = this.editor;
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return [
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// Fires events
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EditorView.domEventHandlers({
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scroll: () => CodeMirror5Emulation.signal(this, 'scroll'),
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focus: () => CodeMirror5Emulation.signal(this, 'focus'),
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paste: event => CodeMirror5Emulation.signal(this, 'paste', event),
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blur: () => CodeMirror5Emulation.signal(this, 'blur'),
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mousedown: event => CodeMirror5Emulation.signal(this, 'mousedown', event),
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}),
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ViewPlugin.fromClass(class {
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public update(update: ViewUpdate) {
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try {
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if (update.viewportChanged) {
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CodeMirror5Emulation.signal(
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cm5,
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'viewportChange',
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editor.viewport.from,
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editor.viewport.to,
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);
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}
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if (update.docChanged) {
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cm5.fireChangeEvents(update);
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cm5.onChange(update);
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}
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if (update.selectionSet) {
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cm5.onSelectionChange();
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}
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CodeMirror5Emulation.signal(cm5, 'update');
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// Catch the error -- otherwise, CodeMirror will de-register the update listener.
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} catch (error) {
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cm5.logMessage(`Error dispatching update: ${error}`);
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}
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}
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}),
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// Decorations
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this._decoratorExtension,
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// Some plugins rely on a CodeMirror-measure element
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// to store temporary content.
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showPanel.of(() => {
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const dom = document.createElement('div');
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dom.classList.add('CodeMirror-measure');
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return { dom };
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}),
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// Note: We can allow legacy CM5 CSS to apply to the editor
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// with a line similar to the following:
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// EditorView.editorAttributes.of({ class: 'CodeMirror' }),
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// Many of these styles, however, don't work well with CodeMirror 6.
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];
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}
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private isEventHandledBySuperclass(eventName: string) {
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return ['beforeSelectionChange'].includes(eventName);
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}
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public on(eventName: string, callback: EditorEventCallback) {
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if (this.isEventHandledBySuperclass(eventName)) {
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return super.on(eventName, callback);
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}
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this._events[eventName] ??= [];
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this._events[eventName].push(callback);
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}
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public off(eventName: string, callback: EditorEventCallback) {
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if (!(eventName in this._events)) {
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return;
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}
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this._events[eventName] = this._events[eventName].filter(
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otherCallback => otherCallback !== callback,
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);
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}
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public static signal(target: CodeMirror5Emulation, eventName: string, ...args: any[]) {
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const listeners = target._events[eventName] ?? [];
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for (const listener of listeners) {
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listener(target, ...args);
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}
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super.signal(target, eventName, ...args);
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}
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private fireChangeEvents(update: ViewUpdate) {
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type ChangeRecord = {
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from: DocumentPosition;
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to: DocumentPosition;
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text: string[];
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removed: string[];
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transaction: Transaction;
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};
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const changes: ChangeRecord[] = [];
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const origDoc = update.startState.doc;
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for (const transaction of update.transactions) {
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transaction.changes.iterChanges((fromA, toA, _fromB, _toB, inserted: Text) => {
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changes.push({
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from: documentPositionFromPos(origDoc, fromA),
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to: documentPositionFromPos(origDoc, toA),
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text: inserted.sliceString(0).split('\n'),
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removed: origDoc.sliceString(fromA, toA).split('\n'),
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transaction,
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});
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});
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}
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// Delay firing events -- event listeners may try to create transactions.
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// (this is done by the rich markdown plugin).
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setTimeout(() => {
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for (const change of changes) {
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CodeMirror5Emulation.signal(this, 'change', change);
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// If triggered by a user, also send the inputRead event
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if (change.transaction.isUserEvent('input')) {
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CodeMirror5Emulation.signal(this, 'inputRead', change);
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}
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}
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CodeMirror5Emulation.signal(this, 'changes', changes);
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}, 0);
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}
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// codemirror-vim's adapter doesn't match the CM5 docs -- wrap it.
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public getCursor(mode?: 'head' | 'anchor' | 'from' | 'to'| 'start' | 'end') {
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if (mode === 'from') {
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mode = 'start';
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}
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if (mode === 'to') {
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mode = 'end';
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}
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return super.getCursor(mode);
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}
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public override getSearchCursor(query: RegExp|string, pos?: DocumentPosition|null|0) {
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// The superclass CodeMirror adapter only supports regular expression
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// arguments.
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if (typeof query === 'string') {
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query = new RegExp(pregQuote(query));
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}
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return super.getSearchCursor(query, pos || { line: 0, ch: 0 });
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}
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public lineAtHeight(height: number, _mode?: 'local') {
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const lineInfo = this.editor.lineBlockAtHeight(height);
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// - 1: Convert to zero-based.
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const lineNumber = this.editor.state.doc.lineAt(lineInfo.to).number - 1;
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return lineNumber;
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}
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public heightAtLine(lineNumber: number, mode?: 'local') {
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// CodeMirror 5 uses 0-based line numbers. CM6 uses 1-based
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// line numbers.
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const doc = this.editor.state.doc;
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const lineInfo = doc.line(Math.min(lineNumber + 1, doc.lines));
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const lineBlock = this.editor.lineBlockAt(lineInfo.from);
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const height = lineBlock.top;
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if (mode === 'local') {
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const editorTop = this.editor.lineBlockAt(0).top;
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return height - editorTop;
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} else {
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return height;
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}
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}
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public lineInfo(lineNumber: number) {
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const line = this.editor.state.doc.line(lineNumber + 1);
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const result = {
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line: lineNumber,
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// Note: In CM5, a line handle is not just a line number
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handle: lineNumber,
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text: line.text,
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gutterMarkers: [] as any[],
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textClass: ['cm-line', ...this._decorator.getLineClasses(lineNumber)],
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bgClass: '',
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wrapClass: '',
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widgets: this._decorator.getLineWidgets(lineNumber),
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};
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return result;
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}
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public getStateAfter(_line: number) {
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// TODO: Should return parser state. Returning an empty object
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// allows some plugins to run without crashing, however.
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return {};
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}
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public getScrollPercent() {
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return getScrollFraction(this.editor);
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}
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public defineExtension(name: string, value: any) {
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(CodeMirror5Emulation.prototype as any)[name] ??= value;
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}
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public defineOption(name: string, defaultValue: any, onUpdate: OptionUpdateCallback) {
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this._options[name] = {
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value: defaultValue,
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onUpdate,
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};
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onUpdate(this, defaultValue, this.Init);
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}
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// Override codemirror-vim's setOption to allow user-defined options
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public override setOption(name: string, value: any) {
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if (name in this._options) {
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const oldValue = this._options[name].value;
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this._options[name].value = value;
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this._options[name].onUpdate(this, value, oldValue);
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} else {
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super.setOption(name, value);
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}
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}
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public override getOption(name: string): any {
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if (name in this._options) {
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return this._options[name].value;
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} else {
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return super.getOption(name);
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}
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}
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// codemirror-vim's API doesn't match the API docs here -- it expects addOverlay
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// to return a SearchQuery. As such, this override returns "any".
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public override addOverlay<State>(modeObject: StreamParser<State>|{ query: RegExp }): any {
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if ('query' in modeObject) {
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return super.addOverlay(modeObject);
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}
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this._decorator.addOverlay(modeObject);
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}
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public addLineClass(lineNumber: number, where: string, className: string) {
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this._decorator.addLineClass(lineNumber, where, className);
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}
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public removeLineClass(lineNumber: number, where: string, className: string) {
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this._decorator.removeLineClass(lineNumber, where, className);
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}
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public addLineWidget(lineNumber: number, node: HTMLElement, options: LineWidgetOptions) {
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this._decorator.addLineWidget(lineNumber, node, options);
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}
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// TODO: Currently copied from useCursorUtils.ts.
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// TODO: Remove the duplicate code when CodeMirror 5 is eventually removed.
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public wrapSelections(string1: string, string2: string) {
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const selectedStrings = this.getSelections();
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// Batches the insert operations, if this wasn't done the inserts
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// could potentially overwrite one another
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this.operation(() => {
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for (let i = 0; i < selectedStrings.length; i++) {
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const selected = selectedStrings[i];
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// Remove white space on either side of selection
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const start = selected.search(/[^\s]/);
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const end = selected.search(/[^\s](?=[\s]*$)/);
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const core = selected.substring(start, end - start + 1);
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// If selection can be toggled do that
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if (core.startsWith(string1) && core.endsWith(string2)) {
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const inside = core.substring(string1.length, core.length - string1.length - string2.length);
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selectedStrings[i] = selected.substring(0, start) + inside + selected.substring(end + 1);
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} else {
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selectedStrings[i] = selected.substring(0, start) + string1 + core + string2 + selected.substring(end + 1);
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}
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}
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this.replaceSelections(selectedStrings);
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});
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}
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public static commands = (() => {
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const commands: Record<string, CodeMirror5Command> = {
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...BaseCodeMirror5Emulation.commands,
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};
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for (const commandName in editorCommands) {
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const command = editorCommands[commandName as keyof typeof editorCommands];
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commands[commandName] = (codeMirror: CodeMirror5Emulation) => command(codeMirror.editor);
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}
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// as any: Required to properly extend the base class -- without this,
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// the commands dictionary isn't known (by TypeScript) to have the same
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// properties as the commands dictionary in the parent class.
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return commands as any;
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})();
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public commands = CodeMirror5Emulation.commands;
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private joplinCommandToCodeMirrorCommand(commandName: string): string|null {
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const match = /^editor\.(.*)$/g.exec(commandName);
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if (!match || !(match[1] in CodeMirror5Emulation.commands)) {
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return null;
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}
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return match[1] as string;
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}
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public supportsJoplinCommand(commandName: string): boolean {
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return this.joplinCommandToCodeMirrorCommand(commandName) in CodeMirror5Emulation.commands;
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}
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public execJoplinCommand(joplinCommandName: string) {
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const commandName = this.joplinCommandToCodeMirrorCommand(joplinCommandName);
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if (commandName === null) {
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this.logMessage(`Unsupported Joplin command, ${joplinCommandName}`);
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return;
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}
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this.execCommand(commandName);
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}
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public commandExists(commandName: string) {
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return commandName in CodeMirror5Emulation.commands;
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}
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public execCommand(name: string) {
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if (!this.commandExists(name)) {
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this.logMessage(`Unsupported CodeMirror command, ${name}`);
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return;
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}
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CodeMirror5Emulation.commands[name as (keyof typeof CodeMirror5Emulation.commands)](this);
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}
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}
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