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Composable primitives for building declarative, transducer based Finite-State Machines & matchers for arbitrary data streams.
See the hiccup-markdown parser & example for a concrete use case.
DEPRECATED - superseded by other package(s)
Search or submit any issues for this package
This package will be merged with and update the existing @thi.ng/transducers-fsm package.
yarn add @thi.ng/fsm
ES module import:
<script type="module" src="https://cdn.skypack.dev/@thi.ng/fsm"></script>
For Node.js REPL:
const fsm = await import("@thi.ng/fsm");
Package sizes (brotli'd, pre-treeshake): ESM: 1.31 KB
There're two key concepts provided by this package:
Matchers are composable functions which receive a single input value and attempt to match it to their configured criteria / patterns. Matchers also support optional user callbacks, which are executed when a match was made and are responsible for state transitions, state update and production of any result values.
See docs strings in /src
folder for now.
The fsm()
function is a Finite-state machine transducer / iterator with support for single lookahead values. Takes an object of states
and their matchers, an arbitrary context object and an initial
state ID.
The returned transducer consumes inputs of type T
and produces results of type R
. The results are produced by callbacks of the given state matchers. Each can produce any number of values. If a callback returns a result wrapped w/ reduced()
, the FSM causes early termination of the overall transducer pipeline. Failed state callbacks too can produce outputs, but will afterwards terminate the FSM.
An IllegalStateError
will be thrown if a transition to an undefined state ID occurs.
The optional update
function will be invoked for each input prior to executing the currently active state matcher. It is intended to update the context object (e.g. to update input location info for generating error messages).
If the optional src
iterable is given, the function returns a transforming iterator of the FSM results.
If this project contributes to an academic publication, please cite it as:
@misc{thing-fsm,
title = "@thi.ng/fsm",
author = "Karsten Schmidt",
note = "https://thi.ng/fsm",
year = 2018
}
© 2018 - 2024 Karsten Schmidt // Apache License 2.0
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