budibase/packages/client/src/state/getState.js

import { isUndefined, isObject } from "lodash/fp"
import { parseBinding, isStoreBinding } from "./parseBinding"

export const getState = (s, path, fallback) => {
  if (!s) return fallback
  if (!path || path.length === 0) return fallback

  if (path === "$") return s

  const pathParts = path.split(".")
  const safeGetPath = (obj, currentPartIndex = 0) => {
    const currentKey = pathParts[currentPartIndex]

    if (pathParts.length - 1 == currentPartIndex) {
      const value = obj[currentKey]
      if (isUndefined(value)) return fallback
      else return value
    }

    if (
      obj[currentKey] === null ||
      obj[currentKey] === undefined ||
      !isObject(obj[currentKey])
    ) {
      return fallback
    }

    return safeGetPath(obj[currentKey], currentPartIndex + 1)
  }

  return safeGetPath(s)
}

export const getStateOrValue = (globalState, prop, currentContext) => {
  if (!prop) return prop

  const binding = parseBinding(prop)

  if (binding) {
    const stateToUse = isStoreBinding(binding) ? globalState : currentContext

    return getState(stateToUse, binding.path, binding.fallback)
  }

  return prop
}