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import { Annotation, EditorState, StateEffect, type Extension } from '@codemirror/state';
import { EditorView, type ViewUpdate } from '@codemirror/view';
import { getDefaultExtensions } from './getDefaultExtensions';
import { getStatistics } from './utils';
import { type ReactCodeMirrorProps } from '.';
const External = Annotation.define<boolean>();
export interface UseCodeMirror extends ReactCodeMirrorProps {
container?: HTMLDivElement | null;
}
const emptyExtensions: Extension[] = [];
export function useCodeMirror(props: UseCodeMirror) {
const {
value,
selection,
onChange,
onStatistics,
onCreateEditor,
onUpdate,
extensions = emptyExtensions,
autoFocus,
theme = 'light',
height = null,
minHeight = null,
maxHeight = null,
width = null,
minWidth = null,
maxWidth = null,
placeholder: placeholderStr = '',
editable = true,
readOnly = false,
indentWithTab: defaultIndentWithTab = true,
basicSetup: defaultBasicSetup = true,
root,
initialState,
} = props;
const [container, setContainer] = useState<HTMLDivElement | null>();
const [view, setView] = useState<EditorView>();
const [state, setState] = useState<EditorState>();
const defaultThemeOption = EditorView.theme({
'&': {
height,
minHeight,
maxHeight,
width,
minWidth,
maxWidth,
},
'& .cm-scroller': {
height: '100% !important',
},
});
const updateListener = EditorView.updateListener.of((vu: ViewUpdate) => {
if (
vu.docChanged &&
typeof onChange === 'function' &&
// Fix echoing of the remote changes:
// If transaction is market as remote we don't have to call `onChange` handler again
!vu.transactions.some((tr) => tr.annotation(External))
) {
const doc = vu.state.doc;
const value = doc.toString();
onChange(value, vu);
}
onStatistics && onStatistics(getStatistics(vu));
});
const defaultExtensions = getDefaultExtensions({
theme,
editable,
readOnly,
placeholder: placeholderStr,
indentWithTab: defaultIndentWithTab,
basicSetup: defaultBasicSetup,
});
let getExtensions = [updateListener, defaultThemeOption, ...defaultExtensions];
if (onUpdate && typeof onUpdate === 'function') {
getExtensions.push(EditorView.updateListener.of(onUpdate));
}
getExtensions = getExtensions.concat(extensions);
useLayoutEffect(() => {
if (container && !state) {
const config = {
doc: value,
selection,
extensions: getExtensions,
};
const stateCurrent = initialState
? EditorState.fromJSON(initialState.json, config, initialState.fields)
: EditorState.create(config);
setState(stateCurrent);
Eif (!view) {
const viewCurrent = new EditorView({
state: stateCurrent,
parent: container,
root,
});
setView(viewCurrent);
onCreateEditor && onCreateEditor(viewCurrent, stateCurrent);
}
}
return () => {
if (view) {
setState(undefined);
setView(undefined);
}
};
}, [container, state]);
useEffect(() => {
Iif (props.container) {
setContainer(props.container);
}
}, [props.container]);
useEffect(
() => () => {
if (view) {
view.destroy();
setView(undefined);
}
},
[view],
);
useEffect(() => {
if (autoFocus && view) {
view.focus();
}
}, [autoFocus, view]);
useEffect(() => {
if (view) {
view.dispatch({ effects: StateEffect.reconfigure.of(getExtensions) });
}
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [
theme,
extensions,
height,
minHeight,
maxHeight,
width,
minWidth,
maxWidth,
placeholderStr,
editable,
readOnly,
defaultIndentWithTab,
defaultBasicSetup,
onChange,
onUpdate,
]);
useEffect(() => {
Iif (value === undefined) {
return;
}
const currentValue = view ? view.state.doc.toString() : '';
if (view && value !== currentValue) {
view.dispatch({
changes: { from: 0, to: currentValue.length, insert: value || '' },
annotations: [External.of(true)],
});
}
}, [value, view]);
return { state, setState, view, setView, container, setContainer };
}
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