Tips for utilizing the Ace editor validator without the need to create a new Ace editor instance

In my React application, I utilize react-ace to build a CSS text editor.

The implementation looks something like this...

import Ace from 'react-ace'

...
  <Ace 
    mode="css" 
    value={value} 
    onChange={onValueChange} 
    onValidate={onValidate} 
    ...
  />
...

It functions effectively by highlighting CSS syntax errors and warnings. The onValidate feature provides the error/warning "annotations" data structure.

However, there arises a situation where I need to run the same validator outside of this component in another part of the application. Essentially, I must pass the content within value through the error/warning annotation system without being able to instantiate the react element.

I attempted the following approach:

import { EditSession } from 'brace'; # "brace" is the module-compatible version of the ace editor used by "react-ace"
import 'brace/mode/css';

export const getCssAnnotations = (value)=> {
  const editSession = new EditSession(value);
  editSession.setMode('ace/mode/css');
  const annotations = editSession.getAnnotations();
  return annotations;
};

Unfortunately, the function returns empty annotations [] every time! It seems that this method only accesses the annotation setter/getter interface without actually generating the annotations. I am unsure of what triggers the annotations creation process normally.

I have consulted the documentation on Creating a Syntax Highlighter for Ace, but I'm uncertain about the necessity of involving a web worker in this scenario.

Thank you!

Answer №1

This script encountered an issue due to the utilization of a web worker by editSession for generating annotations asynchronously:

editSession.on('changeAnnotation', () => {
    let annotations = editSession.getAnnotations();
    callback(null, annotations)
});

More information available here

It's important to note that each editSession currently initializes a new worker, so it is recommended to either use setValue on an existing instance of editSession or invoke editSession.destroy() before executing the callback function.


A comprehensive solution could be structured as follows:

const getAnnotationsPromise = (value, mode)=> {
  const editSession = new EditSession(value);
  editSession.setMode(`ace/mode/${mode}`);

  return new Promise((resolve)=> {
    editSession.on('changeAnnotation', () => {
      const annotations = editSession.getAnnotations();
      editSession.removeAllListeners('changeAnnotation');
      editSession.destroy();
      resolve(annotations);
    });
  });
};

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