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import { VariableAnnotationPatch } from "./AdminSessionTypes"
import { isArray, isPlainObjectWithGuard } from "./Util"
export function setValueRecursive(
json: any,
pointer: string[],
newValue: any
): any {
// If the pointer is empty at this recursion level then just return newValue
if (pointer.length == 0) {
return newValue
} else {
// We check if the currently relevant part of the pointer is a number or a string
const currentPart = pointer[0]
const currentPartAsNumber = Number.parseInt(currentPart)
if (Number.isNaN(currentPartAsNumber)) {
// If we have a string then recurse into the object
let newObject: any = {}
if (json !== undefined) newObject = { ...json }
const currentValue = newObject.hasOwnProperty(currentPart)
? newObject[currentPart]
: undefined
const updatedValue = setValueRecursive(
currentValue,
pointer.slice(1),
newValue
)
// if we got a null back as the result of the update operation
// then delete the key, otherwise set the property to the updated value
if (updatedValue === null) delete newObject[currentPart]
else newObject[currentPart] = updatedValue
return newObject
} else {
// we have a number as a key. Either there is already an array at this place
// and we should update or append it or we need to create a new array (else branch below)
if (isArray(json)) {
const newArray = [...json]
const oldValue =
currentPartAsNumber < newArray.length
? newArray[currentPartAsNumber]
: undefined
const updatedValue = setValueRecursive(
oldValue,
pointer.slice(1),
newValue
)
if (updatedValue === null) {
// if the updated value is null then remove this item
// if this is a valid index, splice it out
if (currentPartAsNumber < newArray.length) {
newArray.splice(currentPartAsNumber, 1)
}
// otherwise ignore it since it is not in the array yet anyhow
} else {
if (currentPartAsNumber < newArray.length) {
newArray[currentPartAsNumber] = updatedValue
} else newArray.push(updatedValue)
}
return newArray
} else {
// if we have a number as key but no array at the current position, then we need to create a new array.
// If the value is nested inside we still need to create the correct substructure inside the new array, so
// recurse but with null as the current json value to create the nested substructure
const updatedValue = setValueRecursive(
null,
pointer.slice(1),
newValue
)
if (updatedValue == null) return null
else return [updatedValue]
}
}
}
}
export function compileGetValueFunction(jsonPointer: string): (x: any) => any {
// TODO: the json8-pointer libarary compile function does not return undefined
// if the item can't be found like find but instead throws. Probably it makes sense
// to try to create a more efficient version here that does not throw exceptions since
// this will be used very often in an inner loop
return (input): any => jsonpointer.find(input, jsonPointer)
}
export function applyPatch(
patchSet: VariableAnnotationPatch,
config: unknown
): any {
const pointer = jsonpointer.parse(patchSet.jsonPointer) as string[]
if (pointer.length == 0) throw Error("Empty JSON path is not supported")
if (
config !== undefined &&
config !== null &&
!(isArray(config) || isPlainObjectWithGuard(config))
) {
throw Error(
"When given an non-empty pointer, config must be either an object or array but it is " +
typeof config
)
}
const currentValue = jsonpointer.find(config, patchSet.jsonPointer)
if (
currentValue !== patchSet.oldValue &&
!(currentValue === undefined && patchSet.oldValue === null)
) {
console.warn(
`When trying to set value for ${patchSet.variableId} at ${patchSet.jsonPointer}, the existing value was ${currentValue} instead of ${patchSet.oldValue}`
)
throw Error("Old value was not as expected")
}
const newConfig = setValueRecursive(config, pointer, patchSet.newValue)
return newConfig
}
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