comparing given value with other value within jsonpath

[doh10002]

Describe the bug
it is hard to say its a bug, but i am trying to create a custom function that can compare the given value with another value is jsonpath. for example '$.info.version' of 'v2' has to match the first part of the paths.
instead me putting version number in rule, i want the rule to dynamically select the version to compare it with all the paths
i selected all the paths using give, but how can i grab '$.info.version' value in custom function?

{
"info": {
"version": "v2",
}
},
"paths": {
"/v2/testRequest": {}
}
}

customFunction.ts

export default createRulesetFunction(
  {
    input: null,
    options: {
      type: "object",
      additionalProperties: true,
      properties: {
        value: true,
          versionPath: true
      },
      required: ["value", "versionPath"],
    },
  },
  function versionControl(targetVal: any , options: any) :IFunctionResult[] {
      const { value } = options;
      const { versionPath } = options;
      // const test = new RegExp("/v[1-9][0-9]*/")

    const versionPattern = /(v[1-9][0-9]*)/g
    const exist = versionPattern.exec(targetVal)
    // const many = exist.length


     if (targetVal !== value) {
      return [
        {
          message: `Must include ${versionPath}.`,
        },
      ];
    }
    return [];
  },
);

Expected behavior
need spectral to check the versions with first part of given

[P0lip]

You can give this a try. I haven't tested it, but it should work.

import { isPlainObject } from '@stoplight/json';
import { createRulesetFunction } from '@stoplight/spectral-core';

type Input = string;
type Options = {
  value: unknown;
  versionPath: unknown;
  [key: string]: unknown;
};

function getVersion(data: unknown): string | null {
  if (isPlainObject(data) && isPlainObject(data.info) && typeof data.info.version === 'string') {
    return data.info.version;
  }

  return null;
}

export default createRulesetFunction<Input, Options>(
  {
    input: {
      type: 'string',
    },
    options: {
      type: 'object',
      additionalProperties: true,
      properties: {
        value: true,
        versionPath: true,
      },
      required: ['value', 'versionPath'],
    },
  },
  function versionControl(targetVal, options, { document }) {
    const { value } = options;
    const { versionPath } = options;
    const version = getVersion(document);
    
    if (version === null) {
      return [
        {
          message: 'Document does not contain valid version',
          path: ['info', 'version']
        }
      ]
    }
    
    // const test = new RegExp("/v[1-9][0-9]*/")

    const versionPattern = /(v[1-9][0-9]*)/g;
    const exist = versionPattern.exec(targetVal);
    // const many = exist.length

    if (targetVal !== value) {
      return [
        {
          message: `Must include ${versionPath}.`,
        },
      ];
    }
    return [];
  },
);

[doh10002]

Hey Thank you so much @P0lip,

But sadly, i keep getting null for

return data.info.version

in getVersion function, even though i know for sure the $.info.version exists.
do i suppose to update the document parameters in

const version = getVersion(document)

with the json file name?
Thank you again.