active.clojure.freer-monad — de.active-group/active-clojure 0.40.0

Freer monads.

This is a variant of active.clojure.monad with a more efficient representation for bind.

See http://okmij.org/ftp/Haskell/extensible/index.html for details.

and-finally clj/s

(and-finally m final-m)

Execute m, and always final-m, no matter if an exception occurs or not.

apply-continuations clj/s

(apply-continuations continuations first-result)

(apply-continuations continuations first-result decomposed-queue)

Apply continuations to the result of the first action.

bind clj/s

(bind first-action continuation)

Bind/flatMap for the free monad.

Bind clj/s

bind-continuations clj/s≠

clj

(bind-continuations rec__3506__auto__)

(bind-continuations data__3507__auto__ v__3508__auto__)

cljs

(bind-continuations rec__3166__auto__)

(bind-continuations data__3167__auto__ v__3168__auto__)

Lens for the continuations field from a Bind record. See active.clojure.freer-monad/make-bind.

bind-except clj/s

(bind-except m handler f)

Evaluate m, and if an exception occurs continue with (handler exception), otherwise with (f value-of-m). Note that neither the handler result is to f, nor exceptions are caught in f.

bind-first-action clj/s≠

clj

(bind-first-action rec__3506__auto__)

(bind-first-action data__3507__auto__ v__3508__auto__)

cljs

(bind-first-action rec__3166__auto__)

(bind-first-action data__3167__auto__ v__3168__auto__)

Lens for the first-action field from a Bind record. See active.clojure.freer-monad/make-bind.

bind? clj/s

(bind? thing)

Is object a Bind record? See active.clojure.freer-monad/make-bind.

call-cc clj/s

(call-cc f)

Construct a CallCC (Accepts a function f with one argument that returns a monadic value. call-cc packages the current continuation as a function and passes it as an argument to f. If the function is called later, the continuation of that call will be discarded and instead reinstate the continuation that was in effect when the function was created.) record.

f: access via active.clojure.freer-monad/call-cc-f

call-cc-f clj/s≠

clj

(call-cc-f rec__3506__auto__)

(call-cc-f data__3507__auto__ v__3508__auto__)

cljs

(call-cc-f rec__3166__auto__)

(call-cc-f data__3167__auto__ v__3168__auto__)

Lens for the f field from a CallCC record. See active.clojure.freer-monad/call-cc.

call-cc? clj/s

(call-cc? thing)

Is object a CallCC record? See active.clojure.freer-monad/call-cc.

CallCC clj/s≠

cljs

Accepts a function f with one argument that returns a monadic value. call-cc packages the current continuation as a function and passes it as an argument to f. If the function is called later, the continuation of that call will be discarded and instead reinstate the continuation that was in effect when the function was created.

combine-monad-command-configs clj/s

(combine-monad-command-configs & mccs)

Combine a sequence of monad-command configs into one. The earlier entries have precedence.

DecomposedQueue cljs

execute-freer-reader-state-exception clj/s

(execute-freer-reader-state-exception command-config m & [state])

Run monadic computation in a reader-state-exception monad, turning exceptions into Clojure exceptions.

• command-config is the configuration object for running commands
• m is the computation to run
• state is an optional initial state (from a previous run)

Returns [result state].

execute-monadic clj/s

(execute-monadic command-config m & [state])

Run monadic computation in an almighty monad, turning exceptions into Clojure exceptions. See [[run-monadic]].

• command-config is the configuration object for running commands
• m is the computation to run
• state is an optional initial state (from a previous run)

Returns [result state].

get-env-component clj/s

(get-env-component name)

Retrieve a named component of a map-valued environment.

get-state-component clj/s

(get-state-component name)

Retrieve a named component of a map-valued state.

IDecomposedQueue clj/s protocol

get-first-continuation clj/s

(get-first-continuation this)

get-rest-continuations clj/s

(get-rest-continuations this)

set-decomposed clj/s

(set-decomposed this first rest)

make-bind clj/s

(make-bind first-action continuations)

Construct a Bind record.

first-action: access via active.clojure.freer-monad/bind-first-action continuations: access via active.clojure.freer-monad/bind-continuations

make-monad-command-config clj/s

(make-monad-command-config run-command env state)

Construct a MonadCommandConfig (Configuration for supporting a set of monad commands.) record.

run-command: access via active.clojure.freer-monad/monad-command-config-run-command env: access via active.clojure.freer-monad/monad-command-config-env state: access via active.clojure.freer-monad/monad-command-config-state

make-queue-node clj/s

(make-queue-node left right)

Construct a QueueNode record.

left: access via active.clojure.freer-monad/queue-node-left right: access via active.clojure.freer-monad/queue-node-right

monad-command-config-env clj/s≠

clj

(monad-command-config-env rec__3506__auto__)

(monad-command-config-env data__3507__auto__ v__3508__auto__)

cljs

(monad-command-config-env rec__3166__auto__)

(monad-command-config-env data__3167__auto__ v__3168__auto__)

reader-monad initial environment represented as a mergable map

monad-command-config-run-command clj/s≠

clj

(monad-command-config-run-command rec__3506__auto__)

(monad-command-config-run-command data__3507__auto__ v__3508__auto__)

cljs

(monad-command-config-run-command rec__3166__auto__)

(monad-command-config-run-command data__3167__auto__ v__3168__auto__)

run-command :: run-any env state comp -> (| [(| exception-value? val) state] unknown-command) Where run-any is a function for running any monad command of the signature `env state comp -> (| [(| exception-value? val) state] unknown-command)

monad-command-config-state clj/s≠

clj

(monad-command-config-state rec__3506__auto__)

(monad-command-config-state data__3507__auto__ v__3508__auto__)

cljs

(monad-command-config-state rec__3166__auto__)

(monad-command-config-state data__3167__auto__ v__3168__auto__)

state-monad initial state represented as a mergable map

monad-command-config? clj/s

(monad-command-config? thing)

Is object a MonadCommandConfig record? See active.clojure.freer-monad/make-monad-command-config.

MonadCommandConfig clj/s≠

cljs

Configuration for supporting a set of monad commands.

monadic clj/s macro

(monadic & ?stmts)

Construct a monadic computation.

The syntax is (monadic <stmt> ...) where <stmt> is one of the following:

• [<pat> <exp> ...] which creates monadic bindings
• (let <bindings>) which creates regular bindings
• anything else is just a regular expression, expected to yield a monadic value.

Example:

(monadic [first (ask "what's your first name?")
          last (ask "what's your last name?")]
         (let [s (str "Hello, " first " " last)])
         (tell s))

null-monad-command-config clj/s

(null-monad-command-config env state)

Monad command-configuration with no commands except for reader/state/exception.

put-state-component! clj/s

(put-state-component! name value)

Set a named component of a map-valued state.

queue-decompose clj/s

(queue-decompose queue decomposed-queue)

queue-decompose-m clj/s macro

(queue-decompose-m queue
                   singleton-name
                   singleton-code
                   first-name
                   rest-name
                   queue-code)

queue-node-left clj/s≠

clj

(queue-node-left rec__3506__auto__)

(queue-node-left data__3507__auto__ v__3508__auto__)

cljs

(queue-node-left rec__3166__auto__)

(queue-node-left data__3167__auto__ v__3168__auto__)

Lens for the left field from a QueueNode record. See active.clojure.freer-monad/make-queue-node.

queue-node-right clj/s≠

clj

(queue-node-right rec__3506__auto__)

(queue-node-right data__3507__auto__ v__3508__auto__)

cljs

(queue-node-right rec__3166__auto__)

(queue-node-right data__3167__auto__ v__3168__auto__)

Lens for the right field from a QueueNode record. See active.clojure.freer-monad/make-queue-node.

queue-node? clj/s

(queue-node? thing)

Is object a QueueNode record? See active.clojure.freer-monad/make-queue-node.

QueueNode clj/s

reified? clj/s

(reified? m)

Checks whether a monadic command is reified.

reify-as clj/s

(reify-as m reification)

Adds reification meta data to m that helps utilities (like the mock runner for tests), to reify a composed command as something comparable (and printable), for cases where the command itself is not; e.g. it includes a bind inside. See [[reify-command]] to extract the meta data again.

reify-command clj/s

(reify-command m)

Return the reification object of m, if one was added with [[reify-as]], or m itself otherwise.

run-freer-reader-state-exception clj/s

(run-freer-reader-state-exception command-config m & [state])

Run monadic computation in a reader-state-exception monad.

• command-config is the configuration object for running commands
• m is the computation to run
• state an optional initial state (from a previous run) that is merged into the one from command-config

Returns [result state]

run-monadic clj/s

(run-monadic command-config m & [state])

Run a monadic computation in an almighty monad. Same as [[run-freer-reader-state-exception]] with the addition of call-cc.

• command-config is the configuration object for running commands
• m is the computation to run
• state an optional initial state (from a previous run) that is merged into the one from command-config

Returns [result state]

run-no-commands clj/s

(run-no-commands run-any env state m)

For use in make-monad-command-config when there are no commands.

sequ clj/s

(sequ ms)

Evaluate each action in the sequence from left to right, and collect the results.

sequ_ clj/s

(sequ_ ms)

Evaluate each action in the sequence from left to right, and ignore the results.

throw-illegal-argument-exception clj/s

(throw-illegal-argument-exception msg)

unknown-command clj/s

Marker that command functions can return to signal they don't recognize a command.

update-state-component! clj/s

(update-state-component! name f & args)

Calls f with the current value of the component and puts back return value as the new component.

with-env-component clj/s

(with-env-component key f m)

Transform a keyed component of a map-valued environment.