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import { Editor, EditorConfiguration } from 'codemirror';
import 'codemirror/addon/selection/active-line';
import {
createAtom,
makeAutoObservable,
observable,
} from 'mobx';
import 'mode-problem';
import {
IXtextOptions,
IXtextServices,
createServices,
removeServices,
} from 'xtext/xtext-codemirror';
import { ThemeStore } from '../theme/ThemeStore';
const xtextLang = 'problem';
const xtextOptions: IXtextOptions = {
xtextLang,
enableFormattingAction: true,
};
const codeMirrorGlobalOptions: EditorConfiguration = {
mode: `xtext/${xtextLang}`,
indentUnit: 2,
styleActiveLine: true,
};
export class EditorStore {
themeStore;
atom;
editor?: Editor;
xtextServices?: IXtextServices;
value = '';
showLineNumbers = false;
constructor(themeStore: ThemeStore) {
this.themeStore = themeStore;
this.atom = createAtom('EditorStore');
makeAutoObservable(this, {
themeStore: false,
atom: false,
editor: observable.ref,
xtextServices: observable.ref,
});
}
/**
* 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.editor) {
throw new Error('CoreMirror editor mounted before unmounting');
}
this.editor = newEditor;
this.xtextServices = createServices(newEditor, xtextOptions);
}
editorWillUnmount(): void {
if (this.editor) {
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 codeMirrorOptions(): EditorConfiguration {
return {
...codeMirrorGlobalOptions,
theme: this.themeStore.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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