@uiw/react-codemirror/esm/useCodeMirror.js

CodeMirror component for React.

import { useEffect, useState } from 'react';
import { EditorState, StateEffect } from '@codemirror/state';
import { indentWithTab } from '@codemirror/commands';
import { EditorView, keymap, placeholder } from '@codemirror/view';
import { oneDark } from '@codemirror/theme-one-dark';
import { basicSetup } from './basicSetup';
export function useCodeMirror(props) {
  var {
    value,
    selection,
    onChange,
    onUpdate,
    extensions = [],
    autoFocus,
    theme = 'light',
    height = '',
    minHeight = '',
    maxHeight = '',
    placeholder: placeholderStr = '',
    width = '',
    minWidth = '',
    maxWidth = '',
    editable = true,
    readOnly = false,
    indentWithTab: defaultIndentWithTab = true,
    basicSetup: defaultBasicSetup = true,
    root
  } = props;
  var [container, setContainer] = useState();
  var [view, setView] = useState();
  var [state, setState] = useState();
  var defaultLightThemeOption = EditorView.theme({
    '&': {
      backgroundColor: '#fff'
    }
  }, {
    dark: false
  });
  var defaultThemeOption = EditorView.theme({
    '&': {
      height,
      minHeight,
      maxHeight,
      width,
      minWidth,
      maxWidth
    }
  });
  var updateListener = EditorView.updateListener.of(vu => {
    if (vu.docChanged && typeof onChange === 'function') {
      var doc = vu.state.doc;

      var _value = doc.toString();

      onChange(_value, vu);
    }
  });
  var getExtensions = [updateListener, defaultThemeOption];

  if (defaultIndentWithTab) {
    getExtensions.unshift(keymap.of([indentWithTab]));
  }

  if (defaultBasicSetup) {
    if (typeof defaultBasicSetup === 'boolean') {
      getExtensions.unshift(basicSetup());
    } else {
      getExtensions.unshift(basicSetup(defaultBasicSetup));
    }
  }

  if (placeholderStr) {
    getExtensions.unshift(placeholder(placeholderStr));
  }

  switch (theme) {
    case 'light':
      getExtensions.push(defaultLightThemeOption);
      break;

    case 'dark':
      getExtensions.push(oneDark);
      break;

    default:
      getExtensions.push(theme);
      break;
  }

  if (editable === false) {
    getExtensions.push(EditorView.editable.of(false));
  }

  if (readOnly) {
    getExtensions.push(EditorState.readOnly.of(true));
  }

  if (onUpdate && typeof onUpdate === 'function') {
    getExtensions.push(EditorView.updateListener.of(onUpdate));
  }

  getExtensions = getExtensions.concat(extensions);
  useEffect(() => {
    if (container && !state) {
      var stateCurrent = EditorState.create({
        doc: value,
        selection,
        extensions: getExtensions
      });
      setState(stateCurrent);

      if (!view) {
        var viewCurrent = new EditorView({
          state: stateCurrent,
          parent: container,
          root
        });
        setView(viewCurrent);
      }
    }

    return () => {
      if (view) {
        setState(undefined);
        setView(undefined);
      }
    };
  }, [container, state]);
  useEffect(() => 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(() => {
    var currentValue = view ? view.state.doc.toString() : '';

    if (view && value !== currentValue) {
      view.dispatch({
        changes: {
          from: 0,
          to: currentValue.length,
          insert: value || ''
        }
      });
    }
  }, [value, view]);
  return {
    state,
    setState,
    view,
    setView,
    container,
    setContainer
  };
}
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