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import type { Editor, EditorConfiguration } from 'codemirror';
import {
createAtom,
makeAutoObservable,
observable,
runInAction,
} from 'mobx';
import type { IXtextOptions, IXtextServices } from 'xtext/xtext-codemirror';
import type { IEditorChunk } from './editor';
import { getLogger } from '../logging';
import type { ThemeStore } from '../theme/ThemeStore';
const log = getLogger('EditorStore');
const xtextLang = 'problem';
const xtextOptions: IXtextOptions = {
xtextLang,
enableFormattingAction: true,
};
const codeMirrorGlobalOptions: EditorConfiguration = {
mode: `xtext/${xtextLang}`,
indentUnit: 2,
styleActiveLine: true,
};
export class EditorStore {
themeStore;
atom;
chunk?: IEditorChunk;
editor?: Editor;
xtextServices?: IXtextServices;
value = '';
showLineNumbers = false;
initialSelection!: { start: number, end: number, focused: boolean };
constructor(themeStore: ThemeStore) {
this.themeStore = themeStore;
this.atom = createAtom('EditorStore');
this.resetInitialSelection();
makeAutoObservable(this, {
themeStore: false,
atom: false,
chunk: observable.ref,
editor: observable.ref,
xtextServices: observable.ref,
initialSelection: false,
});
this.loadChunk();
}
private loadChunk(): void {
const loadingStartMillis = Date.now();
log.info('Requesting editor chunk');
import('./editor').then(({ editorChunk }) => {
runInAction(() => {
this.chunk = editorChunk;
});
const loadingDurationMillis = Date.now() - loadingStartMillis;
log.info('Loaded editor chunk in', loadingDurationMillis, 'ms');
}).catch((error) => {
log.error('Error while loading editor', error);
});
}
setInitialSelection(start: number, end: number, focused: boolean): void {
this.initialSelection = { start, end, focused };
this.applyInitialSelectionToEditor();
}
private resetInitialSelection(): void {
this.initialSelection = {
start: 0,
end: 0,
focused: false,
};
}
private applyInitialSelectionToEditor(): void {
if (this.editor) {
const { start, end, focused } = this.initialSelection;
const doc = this.editor.getDoc();
const startPos = doc.posFromIndex(start);
const endPos = doc.posFromIndex(end);
doc.setSelection(startPos, endPos, {
scroll: true,
});
if (focused) {
this.editor.focus();
}
this.resetInitialSelection();
}
}
/**
* Attaches a new CodeMirror instance and creates Xtext services.
*
* The store will not subscribe to any CodeMirror events. Instead,
* the editor component should subscribe to them and relay them to the store.
*
* @param newEditor The new CodeMirror instance
*/
editorDidMount(newEditor: Editor): void {
if (!this.chunk) {
throw new Error('Editor not loaded yet');
}
if (this.editor) {
throw new Error('CoreMirror editor mounted before unmounting');
}
this.editor = newEditor;
this.xtextServices = this.chunk.createServices(newEditor, xtextOptions);
this.applyInitialSelectionToEditor();
}
editorWillUnmount(): void {
if (!this.chunk) {
throw new Error('Editor not loaded yet');
}
if (this.editor) {
this.chunk.removeServices(this.editor);
}
delete this.editor;
delete this.xtextServices;
}
/**
* Updates the contents of the editor.
*
* @param newValue The new contents of the editor
*/
updateValue(newValue: string): void {
this.value = newValue;
}
reportChanged(): void {
this.atom.reportChanged();
}
protected observeEditorChanges(): void {
this.atom.reportObserved();
}
get codeMirrorTheme(): string {
return `problem-${this.themeStore.className}`;
}
get codeMirrorOptions(): EditorConfiguration {
return {
...codeMirrorGlobalOptions,
theme: this.codeMirrorTheme,
lineNumbers: this.showLineNumbers,
};
}
/**
* @returns `true` if there is history to undo
*/
get canUndo(): boolean {
this.observeEditorChanges();
if (!this.editor) {
return false;
}
const { undo: undoSize } = this.editor.historySize();
return undoSize > 0;
}
undo(): void {
this.editor?.undo();
}
/**
* @returns `true` if there is history to redo
*/
get canRedo(): boolean {
this.observeEditorChanges();
if (!this.editor) {
return false;
}
const { redo: redoSize } = this.editor.historySize();
return redoSize > 0;
}
redo(): void {
this.editor?.redo();
}
toggleLineNumbers(): void {
this.showLineNumbers = !this.showLineNumbers;
}
}
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