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extractSchema.ts
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extractSchema.ts
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import {
type ArraySchemaType,
type NumberSchemaType,
type ObjectField,
type ObjectFieldType,
type ObjectSchemaType,
type ReferenceSchemaType,
type Rule,
type Schema as SchemaDef,
type SchemaType as SanitySchemaType,
type StringSchemaType,
} from '@sanity/types'
import {
type ArrayTypeNode,
createReferenceTypeNode,
type DocumentSchemaType,
type InlineTypeNode,
type NullTypeNode,
type NumberTypeNode,
type ObjectAttribute,
type ObjectTypeNode,
type SchemaType,
type StringTypeNode,
type TypeDeclarationSchemaType,
type TypeNode,
type UnionTypeNode,
type UnknownTypeNode,
} from 'groq-js'
const documentDefaultFields = (typeName: string): Record<string, ObjectAttribute> => ({
_id: {
type: 'objectAttribute',
value: {type: 'string'},
},
_type: {
type: 'objectAttribute',
value: {type: 'string', value: typeName},
},
_createdAt: {
type: 'objectAttribute',
value: {type: 'string'},
},
_updatedAt: {
type: 'objectAttribute',
value: {type: 'string'},
},
_rev: {
type: 'objectAttribute',
value: {type: 'string'},
},
})
const typesMap = new Map<string, TypeNode>([
['text', {type: 'string'}],
['url', {type: 'string'}],
['datetime', {type: 'string'}],
['date', {type: 'string'}],
['boolean', {type: 'boolean'}],
['email', {type: 'string'}],
])
export interface ExtractSchemaOptions {
enforceRequiredFields?: boolean
}
export function extractSchema(
schemaDef: SchemaDef,
extractOptions: ExtractSchemaOptions = {},
): SchemaType {
const inlineFields = new Set<SanitySchemaType>()
const schema: SchemaType = []
// get a list of all the types in the schema, sorted by their dependencies. This ensures that when we check for inline/reference types, we have already processed the type
const sortedSchemaTypeNames = sortByDependencies(schemaDef)
sortedSchemaTypeNames.forEach((typeName) => {
const schemaType = schemaDef.get(typeName)
if (schemaType === undefined) {
return
}
const base = convertBaseType(schemaType)
if (base === null) {
return
}
if (base.type === 'type') {
inlineFields.add(schemaType)
}
schema.push(base)
})
function convertBaseType(
schemaType: SanitySchemaType,
): DocumentSchemaType | TypeDeclarationSchemaType | null {
let typeName: string | undefined
if (schemaType.type) {
typeName = schemaType.type.name
} else if ('jsonType' in schemaType) {
typeName = schemaType.jsonType
}
if (typeName === 'document' && isObjectType(schemaType)) {
const defaultAttributes = documentDefaultFields(schemaType.name)
const object = createObject(schemaType)
if (object.type === 'unknown') {
return null
}
return {
name: schemaType.name,
type: 'document',
attributes: {
...defaultAttributes,
...object.attributes,
},
}
}
const value = convertSchemaType(schemaType)
if (value.type === 'unknown') {
return null
}
if (value.type === 'object') {
return {
name: schemaType.name,
type: 'type',
value: {
type: 'object',
attributes: {
_type: {
type: 'objectAttribute',
value: {
type: 'string',
value: schemaType.name,
},
},
...value.attributes,
},
},
}
}
return {
name: schemaType.name,
type: 'type',
value,
}
}
function convertSchemaType(schemaType: SanitySchemaType): TypeNode {
if (lastType(schemaType)?.name === 'document') {
return createReferenceTypeNode(schemaType.name)
}
// if we have already seen the base type, we can just reference it
if (inlineFields.has(schemaType.type)) {
return {type: 'inline', name: schemaType.type.name} satisfies InlineTypeNode
}
// If we have a type that is point to a type, that is pointing to a type, we assume this is a circular reference
// and we return an inline type referencing it instead
if (schemaType.type?.type?.name === 'object') {
return {type: 'inline', name: schemaType.type.name} satisfies InlineTypeNode
}
if (isStringType(schemaType)) {
return createStringTypeNodeDefintion(schemaType)
}
if (isNumberType(schemaType)) {
return createNumberTypeNodeDefintion(schemaType)
}
// map some known types
if (schemaType.type && typesMap.has(schemaType.type.name)) {
return typesMap.get(schemaType.type.name)
}
// Cross dataset references are not supported
if (isCrossDatasetReferenceType(schemaType)) {
return {type: 'unknown'} satisfies UnknownTypeNode // we don't support cross-dataset references at the moment
}
if (isReferenceType(schemaType)) {
return createReferenceTypeNodeDefintion(schemaType)
}
if (isArrayType(schemaType)) {
return createArray(schemaType)
}
if (isObjectType(schemaType)) {
return createObject(schemaType)
}
throw new Error(`Type "${schemaType.name}" not found`)
}
function createObject(
schemaType: ObjectSchemaType | SanitySchemaType,
): ObjectTypeNode | UnknownTypeNode {
const attributes: Record<string, ObjectAttribute> = {}
const fields = gatherFields(schemaType)
for (const field of fields) {
const fieldIsRequired = isFieldRequired(field)
const value = convertSchemaType(field.type)
if (value === null) {
continue
}
attributes[field.name] = {
type: 'objectAttribute',
value,
optional: extractOptions.enforceRequiredFields ? fieldIsRequired : true,
}
}
// Ignore empty objects
if (Object.keys(attributes).length === 0) {
return {type: 'unknown'} satisfies UnknownTypeNode
}
if (schemaType.type?.name !== 'document') {
attributes._type = {
type: 'objectAttribute',
value: {
type: 'string',
value: schemaType.name,
},
}
}
return {
type: 'object',
attributes,
}
}
function createArray(arraySchemaType: ArraySchemaType): ArrayTypeNode | NullTypeNode {
const of: TypeNode[] = []
for (const item of arraySchemaType.of) {
const field = convertSchemaType(item)
if (field.type === 'inline') {
of.push({
type: 'object',
attributes: {
_key: createKeyField(),
},
rest: field,
} satisfies ObjectTypeNode)
} else if (field.type === 'object') {
field.rest = {
type: 'object',
attributes: {
_key: createKeyField(),
},
}
of.push(field)
} else {
of.push(field)
}
}
if (of.length === 0) {
return {type: 'null'}
}
return {
type: 'array',
of:
of.length > 1
? {
type: 'union',
of,
}
: of[0],
}
}
return schema
}
function createKeyField(): ObjectAttribute<StringTypeNode> {
return {
type: 'objectAttribute',
value: {
type: 'string',
},
}
}
function isFieldRequired(field: ObjectField): boolean {
const {validation} = field.type
if (!validation) {
return false
}
const rules = Array.isArray(validation) ? validation : [validation]
for (const rule of rules) {
let required = false
// hack to check if a field is required. We create a proxy that returns itself when a method is called,
// if the method is "required" we set a flag
const proxy = new Proxy(
{},
{
get: (target, methodName) => () => {
if (methodName === 'required') {
required = true
}
return proxy
},
},
) as Rule
if (typeof rule === 'function') {
rule(proxy)
if (required) {
return true
}
}
}
return false
}
function isObjectType(typeDef: SanitySchemaType): typeDef is ObjectSchemaType {
return isType(typeDef, 'object') || typeDef.jsonType === 'object' || 'fields' in typeDef
}
function isArrayType(typeDef: SanitySchemaType): typeDef is ArraySchemaType {
return isType(typeDef, 'array')
}
function isReferenceType(typeDef: SanitySchemaType): typeDef is ReferenceSchemaType {
return isType(typeDef, 'reference')
}
function isCrossDatasetReferenceType(typeDef: SanitySchemaType) {
return isType(typeDef, 'crossDatasetReference')
}
function isStringType(typeDef: SanitySchemaType): typeDef is StringSchemaType {
return isType(typeDef, 'string')
}
function isNumberType(typeDef: SanitySchemaType): typeDef is NumberSchemaType {
return isType(typeDef, 'number')
}
function createStringTypeNodeDefintion(
stringSchemaType: StringSchemaType,
): StringTypeNode | UnionTypeNode<StringTypeNode> {
if (stringSchemaType.options?.list) {
return {
type: 'union',
of: stringSchemaType.options.list.map((v) => ({
type: 'string',
value: typeof v === 'string' ? v : v.value,
})),
}
}
return {
type: 'string',
}
}
function createNumberTypeNodeDefintion(
numberSchemaType: NumberSchemaType,
): NumberTypeNode | UnionTypeNode<NumberTypeNode> {
if (numberSchemaType.options?.list) {
return {
type: 'union',
of: numberSchemaType.options.list.map((v) => ({
type: 'number',
value: typeof v === 'number' ? v : v.value,
})),
}
}
return {
type: 'number',
}
}
function createReferenceTypeNodeDefintion(
reference: ReferenceSchemaType,
): ObjectTypeNode | UnionTypeNode<ObjectTypeNode> {
const references = gatherReferenceNames(reference)
if (references.length === 1) {
return createReferenceTypeNode(references[0])
}
return {
type: 'union',
of: references.map((name) => createReferenceTypeNode(name)),
}
}
// Traverse the reference type tree and gather all the reference names
function gatherReferenceNames(type: ReferenceSchemaType): string[] {
const allReferences = gatherReferenceTypes(type)
// Remove duplicates
return [...new Set([...allReferences.map((ref) => ref.name)])]
}
function gatherReferenceTypes(type: ReferenceSchemaType): ObjectSchemaType[] {
const refTo = 'to' in type ? type.to : []
if ('type' in type && isReferenceType(type.type)) {
return [...gatherReferenceTypes(type.type), ...refTo]
}
return refTo
}
// Traverse the type tree and gather all the fields
function gatherFields(type: SanitySchemaType | ObjectSchemaType): ObjectField[] {
if ('fields' in type) {
return type.type ? gatherFields(type.type).concat(type.fields) : type.fields
}
return []
}
// Traverse the type tree and check if the type or any of its subtypes are of the given type
function isType(
typeDef: SanitySchemaType | ObjectField | ObjectFieldType,
typeName: string,
): boolean {
let type: SchemaType | ObjectField | ObjectFieldType | undefined = typeDef
while (type) {
if (type.name === typeName || (type.type && type.type.name === typeName)) {
return true
}
type = type.type
}
return false
}
// Traverse the type tree and return the "last" type, ie deepest type in the tree
function lastType(typeDef: SanitySchemaType): SanitySchemaType | undefined {
let type: SchemaType | ObjectField | ObjectFieldType | undefined = typeDef
while (type) {
if (!type.type) {
return type
}
type = type.type
}
return undefined
}
// Sorts the types by their dependencies by using a topological sort depth-first algorithm.
function sortByDependencies(compiledSchema: SchemaDef): string[] {
const seen = new Set<SanitySchemaType>()
// Walks the dependencies of a schema type and adds them to the dependencies set
function walkDependencies(
schemaType: SanitySchemaType,
dependencies: Set<SanitySchemaType>,
): void {
if (seen.has(schemaType)) {
return
}
seen.add(schemaType)
if ('fields' in schemaType) {
for (const field of gatherFields(schemaType)) {
const last = lastType(field.type)
if (last.name === 'document') {
dependencies.add(last)
continue
}
let schemaTypeName: string | undefined
if (schemaType.type.type) {
schemaTypeName = field.type.type.name
} else if ('jsonType' in schemaType.type) {
schemaTypeName = field.type.jsonType
}
if (schemaTypeName === 'object' || schemaTypeName === 'block') {
if (isReferenceType(field.type)) {
field.type.to.forEach((ref) => dependencies.add(ref.type))
} else {
dependencies.add(field.type)
}
}
walkDependencies(field.type, dependencies)
}
} else if ('of' in schemaType) {
for (const item of schemaType.of) {
walkDependencies(item, dependencies)
}
}
}
const dependencyMap = new Map<SanitySchemaType, Set<SanitySchemaType>>()
compiledSchema.getTypeNames().forEach((typeName) => {
const schemaType = compiledSchema.get(typeName)
if (schemaType === undefined || schemaType.type === null) {
return
}
const dependencies = new Set<SanitySchemaType>()
walkDependencies(schemaType, dependencies)
dependencyMap.set(schemaType, dependencies)
seen.clear() // Clear the seen set for the next type
})
// Sorts the types by their dependencies
const typeNames: string[] = []
// holds a temporary mark for types that are currently being visited, to detect cyclic dependencies
const currentlyVisiting = new Set<SanitySchemaType>()
// holds a permanent mark for types that have been already visited
const visited = new Set<SanitySchemaType>()
// visit implements a depth-first search
function visit(type: SanitySchemaType) {
if (visited.has(type)) {
return
}
// If we find a type that is already in the temporary mark, we have a cyclic dependency.
if (currentlyVisiting.has(type)) {
return
}
// mark this as a temporary mark, meaning it's being visited
currentlyVisiting.add(type)
const deps = dependencyMap.get(type)
if (deps !== undefined) {
deps.forEach((dep) => visit(dep))
}
currentlyVisiting.delete(type)
visited.add(type)
if (!typeNames.includes(type.name)) {
typeNames.unshift(type.name)
}
}
// Visit all types in the dependency map
for (const [type] of dependencyMap) {
visit(type)
}
return typeNames
}