import type { IObjectOf , Path , Tuple } from "@thi.ng/api" ; import type { IAtom } from "@thi.ng/atom" ; import { isFunction } from "@thi.ng/checks/is-function" ; import { isPlainObject } from "@thi.ng/checks/is-plain-object" ; import { isString } from "@thi.ng/checks/is-string" ; import { illegalArgs } from "@thi.ng/errors/illegal-arguments" ; import { getInUnsafe } from "@thi.ng/paths/get-in" ; import { absPath , resolve , ResolveFn } from "@thi.ng/resolve-map" ; import { CloseMode , ISubscription } from "@thi.ng/rstream/api" ; import { fromIterableSync } from "@thi.ng/rstream/iterable" ; import { StreamSync , sync } from "@thi.ng/rstream/sync" ; import { fromViewUnsafe } from "@thi.ng/rstream/view" ; import type { Transducer } from "@thi.ng/transducers" ; import { map } from "@thi.ng/transducers/map" ; import type { Graph , GraphSpec , Node , NodeFactory , NodeInputs , NodeInputSpec , NodeOutputs , NodeOutputSpec , NodeResolver , NodeSpec , } from "./api.js" ; /**
 * Dataflow graph initialization function. Takes a state Atom (or `null`
 * if not needed) and an object of  NodeSpec values or functions
 * returning  Node objects. Calls `nodeFromSpec()` for each spec
 * and then recursively resolves references via
 *  {@link @thi.ng/resolve-map#resolve} . Returns new initialized graph
 * object of  Node objects and
 *  {@link @thi.ng/rstream# | @thi.ng/rstream} stream constructs. Does
 * NOT mutate original  GraphSpec object.
 *
 *  param state param spec export const initGraph = ( state , spec ) : Graph => { const res = { } ; for ( let id in spec ) { const n = spec [ id ] ; res [ id ] = isNodeSpec ( n ) ? nodeFromSpec ( state , n , id ) : n ; } return resolve ( res ) ; } ; internal const isNodeSpec = ( x ) : x is NodeSpec => isPlainObject ( x ) && isFunction ( x . fn ) ; /**
 * Transforms a single  NodeSpec into a lookup function for
 *  resolve (which is called from  initGraph ). When that
 * function is called, recursively resolves all specified input streams
 * and calls this spec's `fn` to produce a new stream from these inputs.
 *
 * If the spec includes the optional `outs` keys, it also creates the
 * subscriptions for each of the given output keys, which then can be
 * used as inputs by other nodes. Each value in the `outs` subspec can
 * be a function or state path (string/number/array, see
 *  {@link @thi.ng/paths# | @thi.ng/paths} ). Functions are called with this node's
 * constructed stream/subscribable and the output id and must return a
 * new  {@link @thi.ng/rstream#ISubscribable} . For path values a
 * subscription is added to this node's result stream which then updates
 * the provided state atom at the path given.
 *
 * Non-function output specs subs assume the raw node output value is an
 * object from which the different output keys are being extracted. The
 * special `*` output key can be used to handle the entire node output
 * value. This is useful/required for non-object node result values.
 *
 *  example ```ts
 * out: {
 *   // fn output spec
 *   // creates new sub which uses  pick transducer to
 *   // select key `a` from main node output (assumed to be object)
 *   a: (node, id) => node.subscribe({}, pick(id)),
 *
 *   // yields sub of `b` key's values extracted from main output
 *   // and also stores them at given path in state atom
 *   b: "foo.b"
 *
 *   // yields sub with same value as main node output and
 *   // stores vals in state atom at given path
 *   "*": "foo.main"
 * }
 * ```
 *
 * See `api.ts` for further details and possible spec variations.
 *
 *  param state param spec param id const nodeFromSpec = ( state , spec , id ) => ( resolve ) : Node => { const ins = prepareNodeInputs ( spec . ins , state , resolve ) ; const node = spec . fn ( ins , id ) ; const outs = prepareNodeOutputs ( spec . outs , node , state , id ) ; return { ins , node , outs } ; } ; const prepareNodeInputs = ( ins , state , resolve ) => { const res = { } ; if ( ! ins ) return res ; for ( let id in ins ) { const i = ins [ id ] ; const src = getNodeInput ( i , id , state , resolve ) ; res [ id ] = i . xform ? src . transform ( i . xform , { id } ) : src ; } return res ; } ; const getNodeInput = ( i , id , state , resolve ) : ISubscription < any , any > => i . path ? fromViewUnsafe ( state , { path : i . path } ) : i . stream ? isString ( i . stream ) ? resolve ( i . stream ) : i . stream ( resolve ) : i . const !== undefined ? fromIterableSync ( [ isFunction ( i . const ) ? i . const ( resolve ) : i . const ] , { closeIn : CloseMode . NEVER , } ) : illegalArgs ( `invalid node input: ${ id }` ) ; const prepareNodeOutputs = ( outs , node , state , nodeID ) => { const res = { } ; if ( ! outs ) return res ; for ( let id in outs ) { const out = outs [ id ] ; res [ id ] = isFunction ( out ) ? out ( node , id ) : id == "*" ? nodeOutAll ( node , state , nodeID , out ) : nodeOutID ( node , state , nodeID , out , id ) ; } return res ; } ; const nodeOutAll = ( node , state , nodeID , path ) => node . subscribe ( { next : ( x ) => state . resetIn ( < any > path , x ) , } , { id : `out-${ nodeID }` } ) ; const nodeOutID = ( node , state , nodeID , path , id ) => node . subscribe ( { next : ( x ) => state . resetIn ( < any > path , x ) , } , { xform : map ( ( x ) => ( x != null ? x [ id ] : x ) ) , id : `out-${ nodeID }-${ id }` , } ) ; /**
 * Compiles given  NodeSpec and adds it to graph. Returns compiled
 *  Node object for the given spec. Throws error if the graph already
 * contains a node with given `id`.
 *
 *  param graph param state param id param spec export const addNode = ( graph , state , id , spec ) : Node => { graph [ id ] && illegalArgs ( `graph already contains a node with ID: ${ id }` ) ; return ( graph [ id ] = nodeFromSpec ( state , spec , id ) ( ( path ) => getInUnsafe ( graph , absPath ( [ id ] , path ) ) ) ) ; } ; param graph param id export const removeNode = ( graph , id ) => { const node = graph [ id ] ; if ( node ) { node . node . unsubscribe ( ) ; for ( let id in node . outs ) { node . outs [ id ] . unsubscribe ( ) ; } delete graph [ id ] ; return true ; } return false ; } ; param graph export const stop = ( graph ) => { for ( let id in graph ) { graph [ id ] . node . unsubscribe ( ) ; } } ; /**
 * Higher order node / stream creator. Takes a transducer and (optional)
 * required input stream IDs. The returned function takes an object of
 * input streams and returns a new  {@link @thi.ng/rstream#StreamSync} * instance. The returned function will throw an error if `inputIDs` is
 * given and the object of inputs does not contain all of them.
 *
 * If `reset` is true (default: false), the `xform` will only re-run
 * when all inputs have produced new values. See
 *  {@link @thi.ng/rstream#StreamSync} for further reference.
 *
 * // TODO add close behavior opts
 *
 *  param xform param inputIDs param reset export const node = ( xform , inputIDs ? , reset = false ) : NodeFactory < any > => ( src , id ) : StreamSync < any , any > => { ensureInputs ( src , inputIDs , id ) ; return sync ( { src , xform , id , reset } ) ; } ; /**
 * Similar to  node , but optimized for nodes using only a single
 * input. Uses "src" as default input ID.
 *
 * // TODO add close behavior opts
 *
 *  param xform param inputID export const node1 = ( xform ? , inputID = "src" ) : NodeFactory < any > => ( src , id ) : ISubscription < any , any > => { ensureInputs ( src , [ inputID ] , id ) ; return src [ inputID ] . subscribe ( { } , { xform , id } ) ; } ; param xform param inputIDs param reset export const node2 = ( xform , inputIDs = [ "a" , "b" ] , reset = false ) => node ( xform , inputIDs , reset ) ; param src param inputIDs param nodeID export const ensureInputs = ( src , inputIDs , nodeID ) => { if ( inputIDs ) { const missing = [ ] ; for ( let i of inputIDs ) { ! src [ i ] && missing . push ( i ) ; } missing . length && illegalArgs ( `node "${ nodeID }": missing input(s): ${ missing . join ( ", " ) }` ) ; } } ;