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impl.cljc
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impl.cljc
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(ns sc.impl
(:require [sc.impl.db :as db]
[sc.impl.logging :as il]
[sc.api.logging]))
(defn gen-cs-id
[]
(swap! db/cs-id dec))
(defn gen-ep-id
[]
(swap! db/ep-id inc))
(defn last-ep-id*
[db]
(let [eps (get db :execution-points)]
(if (empty? db)
(throw (ex-info
"No Execution Point has been saved yet."
{:sc.api.error/error-type
:sc.api.error-types/no-ep-saved-yet}))
(let [[epid ep-v] (apply max-key first eps)]
[epid (-> ep-v :sc.ep/code-site :sc.cs/id)]))))
(defn last-ep-id
[]
(last-ep-id* @db/db))
(defn valid-ep-identifier?
[v]
(or
(and
(integer? v)
(pos? v))
(and
(vector? v)
(let [[ep-id cs-id] v]
(and
(integer? ep-id) (pos? ep-id)
(integer? cs-id) (neg? cs-id))))
))
(defn validate-ep-identifier
[ep-id]
(when-not (valid-ep-identifier? ep-id)
(throw (ex-info
(str
"ep-id should be either a positive number or a [(positive-number) (negative-number)] tuple, got: "
(try
(pr-str ep-id)
(catch Throwable err
"(failed to print)")))
{:sc.api.error/error-type
:sc.api.error-types/invalid-ep-id
:ep-id ep-id}))))
(defn resolve-ep-id
"Validates ep-id to an Execution Point id (in integer or vector form)
and normalizes it to integer form."
[ep-id]
(validate-ep-identifier ep-id)
(cond
(vector? ep-id) (first ep-id)
:else ep-id))
(defn find-ep
[db ep-id]
(let [epid (resolve-ep-id ep-id)]
(-> db :execution-points (get epid)
(or (throw (ex-info (str "No Execution Point with ID " epid)
{:sc.api.error/error-type
:sc.api.error-types/no-ep-found-with-id
:sc.ep/id epid
:ep-id ep-id}))))))
(defn read-ep-info
[db ep-id]
(let [ep (find-ep db ep-id)
cs (-> db :code-sites (get (-> ep :sc.ep/code-site :sc.cs/id)))]
(-> ep
(dissoc :sc.ep/private)
(assoc :sc.ep/code-site cs))
))
(defn ep-info
[ep-id]
(read-ep-info @db/db ep-id))
(defn read-cs-info
[db cs-id]
(-> db :code-sites (get cs-id)
(or (throw (ex-info (str "No Code Site found with id " cs-id)
{:sc.api.error/error-type
:sc.api.error-types/no-cs-found-with-id
:sc.cs/id cs-id})))))
(defn cs-info
[cs-id]
(read-cs-info @db/db cs-id))
(defn compilation-target
[amp-env]
;; HACK detecting whether we're compiling to Clojure or ClojureScript (Val, 02 Oct 2017)
;; see https://groups.google.com/forum/#!msg/clojurescript/iBY5HaQda4A/w1lAQi9_AwsJ
(if (:ns amp-env)
:cljs
:clj))
(defmulti extract-local-names
(fn [strategy amp-env amp-form expr] strategy))
(defmethod extract-local-names :default
[_ amp-env _ _]
(case (compilation-target amp-env)
:clj
(into []
(filter symbol?) ;; in CLJS will also have an :ns key
(keys amp-env))
:cljs
(into []
(keys (:locals amp-env)))))
(defn make-cs-data
[opts cs-id expr amp-env amp-form]
(let [fm (meta amp-form)]
{:sc.cs/id cs-id
:sc.cs/expr expr
:sc.cs/local-names
(extract-local-names (:sc/local-names-extractor opts)
amp-env amp-form expr)
:sc.cs/dynamic-var-names
(get opts :sc/dynamic-vars nil)
:sc.cs/file #?(:clj (case (compilation-target amp-env)
:clj *file*
:cljs (:file fm))
:cljs (:file fm))
:sc.cs/line (:line fm)
:sc.cs/column (:column fm)}))
(defn save-cs
[cs-data]
(swap! db/db
(fn [db]
(update-in db [:code-sites (:sc.cs/id cs-data)] merge cs-data))))
(defn save-and-log-ep-scope
[logger-fn ep-id cs-data local-bindings dynamic-var-bindings]
(let [ep {:sc.ep/id ep-id
:sc.ep/code-site (select-keys cs-data [:sc.cs/id])
:sc.ep/local-bindings local-bindings
:sc.ep/dynamic-var-bindings dynamic-var-bindings}]
(swap! db/db
(fn [db]
(-> db
(update-in [:code-sites (:sc.cs/id cs-data)] merge cs-data)
(update-in [:execution-points ep-id] merge ep))))
(logger-fn (ep-info ep-id))
nil))
(defn cs-disabled?
[cs-id]
(get-in @db/db [:code-sites cs-id :sc.cs/disabled]))
(defn save-v
[ep-id err? v]
(read-ep-info
(swap! db/db
assoc-in [:execution-points ep-id (if err? :sc.ep/error :sc.ep/value)] v)
ep-id))
(defn save-and-log-v
[log-v ep-id error? v]
(let [ep (save-v ep-id error? v)]
(try
(log-v ep)
(catch #?(:clj Throwable :cljs :default) err nil)))
nil)
(defn emit-save-scope
[logger-fn ep-id-s cs-data]
`(when-not (cs-disabled? ~(:sc.cs/id cs-data))
(save-and-log-ep-scope
~logger-fn
~ep-id-s
(quote ~cs-data)
~(into {}
(map (fn [l]
[`(quote ~l) l]))
(:sc.cs/local-names cs-data))
~(into {}
(map (fn [l]
[`(quote ~l) l]))
(:sc.cs/dynamic-var-names cs-data)))))
(defn spy-emit
[opts expr amp-env amp-form]
(let [cp-target (compilation-target amp-env)
{cs-logger-id :sc/spy-cs-logger-id
spy-pre-eval-logger :sc/spy-ep-pre-eval-logger
spy-post-eval-logger :sc/spy-ep-post-eval-logger
:or {cs-logger-id :sc.api.logging/log-spy-cs
spy-pre-eval-logger `sc.api.logging/log-spy-ep-pre-eval
spy-post-eval-logger `sc.api.logging/log-spy-ep-post-eval
}} opts
cs-id (gen-cs-id)
cs-data (make-cs-data opts cs-id expr amp-env amp-form)]
(save-cs cs-data)
(il/log-cs cs-logger-id cs-data)
(let [local-names (:sc.cs/local-names cs-data)
ep-id-s (gensym "ep-id")]
`(let [~ep-id-s (gen-ep-id)]
~(emit-save-scope spy-pre-eval-logger ep-id-s cs-data)
~(when expr
`(try
(let [v# ~expr]
(when-not (cs-disabled? ~(:sc.cs/id cs-data))
(save-and-log-v ~spy-post-eval-logger ~ep-id-s false v#))
v#)
(catch ~(case cp-target
:clj 'java.lang.Throwable
:cljs `:default) err#
(when-not (cs-disabled? ~(:sc.cs/id cs-data))
(save-and-log-v ~spy-post-eval-logger ~ep-id-s true err#))
(throw err#))))))
))
(defn add-ep-brk-port
[ep-id]
#?(:clj
(let [p (promise)]
(swap! db/db assoc-in [:execution-points ep-id :sc.ep/private :sc.ep/brk-send-resume-cmd]
(fn send-resume-cmd [cmd]
(deliver p cmd)
nil))
p)
:cljs
(throw (ex-info "BRK not supported on ClojureScript."
{:sc.api.error/error-type
:sc.api.error-types/brk-not-suppored-on-cljs}))))
(defn brk-emit
[opts expr amp-env amp-form]
(let [cp-target (compilation-target amp-env)
{cs-logger-id :sc/brk-cs-logger-id
brk-pre-eval-logger :sc/brk-ep-pre-eval-logger
brk-post-eval-logger :sc/brk-ep-post-eval-logger
:or {cs-logger-id :sc.api.logging/log-brk-cs
brk-pre-eval-logger `sc.api.logging/log-brk-ep-pre-eval
brk-post-eval-logger `sc.api.logging/log-brk-ep-post-eval
}} opts
cs-id (gen-cs-id)
cs-data (make-cs-data opts cs-id expr amp-env amp-form)]
(save-cs cs-data)
(il/log-cs cs-logger-id cs-data)
(let [local-names (:sc.cs/local-names cs-data)
ep-id-s (gensym "ep-id")]
`(let [~ep-id-s (gen-ep-id)]
(try
(let [cs-disabled?# (cs-disabled? ~cs-id)
p# (when-not cs-disabled?#
(add-ep-brk-port ~ep-id-s))
_# ~(emit-save-scope brk-pre-eval-logger ep-id-s cs-data)
v# (let [cmd# (if cs-disabled?#
{:sc.brk/type :sc.brk.type/loose}
(deref p#))]
(if (nil? cmd#)
(throw (ex-info "BRK channel was closed."
{:sc.ep/id ~ep-id-s}))
(case (:sc.brk/type cmd#)
:sc.brk.type/loose
~expr
:sc.brk.type/loose-with
(:sc.brk/loose-value cmd#)
:sc.brk.type/loose-with-err
(throw (:sc.brk/loose-error cmd#))
(throw (ex-info "Malformed BRK command"
{:sc.api.error/error-type
:sc.api.error-types/malformed-brk-command
:sc.ep/id ~ep-id-s
:cmd cmd#}))))
)]
(when-not cs-disabled?#
(save-and-log-v ~brk-post-eval-logger ~ep-id-s false v#))
v#)
(catch ~(case cp-target
:clj 'java.lang.Throwable
:cljs `:default) err#
(when-not (cs-disabled? ~(:sc.cs/id cs-data))
(save-and-log-v ~brk-post-eval-logger ~ep-id-s true err#))
(throw err#)))))
))
(defn brk-send-resume-cmd
[ep-id cmd]
((-> (find-ep @db/db ep-id)
:sc.ep/private :sc.ep/brk-send-resume-cmd
(or (throw (ex-info "This Execution Point was not created via sc.api/brk"
{:sc.api.error/error-type
:sc.api.error-types/ep-not-created-via-brk
:ep-id ep-id}))))
cmd))
(defn resolve-code-site
[ep-id]
(validate-ep-identifier ep-id)
(let [cs-id
(cond
(vector? ep-id)
(second ep-id)
(integer? ep-id)
(-> (ep-info ep-id) :sc.ep/code-site :sc.cs/id))]
(cs-info cs-id)))
(defn ep-binding
[ep-id local-name]
(-> (find-ep @db/db ep-id)
:sc.ep/local-bindings (get local-name)))
(defn ep-var-binding
[ep-id var-name]
(-> (find-ep @db/db ep-id)
:sc.ep/dynamic-var-bindings (get var-name)))
(defn disable!
[cs-id]
(swap! db/db assoc-in [:code-sites cs-id :sc.cs/disabled] true)
cs-id)
(defn enable!
[cs-id]
(swap! db/db assoc-in [:code-sites cs-id :sc.cs/disabled] false)
cs-id)
(defn dispose!
[ep-id]
(let [epid (resolve-ep-id ep-id)]
(when-let [f (get-in @db/db [:execution-points epid :sc.ep/private :sc.ep/brk-send-resume-cmd])]
(f nil))
(swap! db/db update :execution-points dissoc epid)
nil))
(defn dispose-all!
[]
(->> @db/db :execution-points
keys
(run! dispose!)))
(defn save-ep
[ep-id ep-data]
{:pre [(integer? ep-id) (pos? ep-id)
(contains? ep-data :sc.ep/code-site)
(contains? ep-data :sc.ep/local-bindings)]}
(swap! db/db update-in [:execution-points ep-id]
(fn [old-ep]
(-> ep-data
(assoc :sc.ep/id ep-id)
(assoc :sc.ep/private (:sc.ep/private old-ep))
(update :sc.ep/code-site #(select-keys % [:sc.cs/id]))))))