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compiler.clj
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compiler.clj
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; Copyright (c) Rich Hickey. All rights reserved.
; The use and distribution terms for this software are covered by the
; Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
; which can be found in the file epl-v10.html at the root of this distribution.
; By using this software in any fashion, you are agreeing to be bound by
; the terms of this license.
; You must not remove this notice, or any other, from this software.
(set! *warn-on-reflection* true)
(ns cljs.compiler
(:refer-clojure :exclude [munge macroexpand-1])
(:require [clojure.java.io :as io]
[clojure.string :as string])
(:import java.lang.StringBuilder))
(declare resolve-var)
(require 'cljs.core)
(def js-reserved
#{"abstract" "boolean" "break" "byte" "case"
"catch" "char" "class" "const" "continue"
"debugger" "default" "delete" "do" "double"
"else" "enum" "export" "extends" "final"
"finally" "float" "for" "function" "goto" "if"
"implements" "import" "in" "instanceof" "int"
"interface" "let" "long" "native" "new"
"package" "private" "protected" "public"
"return" "short" "static" "super" "switch"
"synchronized" "this" "throw" "throws"
"transient" "try" "typeof" "var" "void"
"volatile" "while" "with" "yield" "methods"})
(def cljs-reserved-file-names #{"deps.cljs"})
(defonce namespaces (atom '{cljs.core {:name cljs.core}
cljs.user {:name cljs.user}}))
(def ^:dynamic *cljs-ns* 'cljs.user)
(def ^:dynamic *cljs-file* nil)
(def ^:dynamic *cljs-warn-on-undeclared* false)
(defmacro ^:private debug-prn
[& args]
`(.println System/err (str ~@args)))
(defn munge [s]
(let [ss (str s)
ms (if (.contains ss "]")
(let [idx (inc (.lastIndexOf ss "]"))]
(str (subs ss 0 idx)
(clojure.lang.Compiler/munge (subs ss idx))))
(clojure.lang.Compiler/munge ss))
ms (if (js-reserved ms) (str ms "$") ms)]
(if (symbol? s)
(symbol ms)
ms)))
(defn confirm-var-exists [env prefix suffix]
(when *cljs-warn-on-undeclared*
(let [crnt-ns (-> env :ns :name)]
(when (= prefix crnt-ns)
(when-not (-> @namespaces crnt-ns :defs suffix)
(binding [*out* *err*]
(println
(str "WARNING: Use of undeclared Var " prefix "/" suffix
(when (:line env)
(str " at line " (:line env)))))))))))
(defn resolve-ns-alias [env name]
(let [sym (symbol name)]
(get (:requires (:ns env)) sym sym)))
(defn core-name?
"Is sym visible from core in the current compilation namespace?"
[env sym]
(and (get (:defs (@namespaces 'cljs.core)) sym)
(not (contains? (-> env :ns :excludes) sym))))
(defn js-var [sym]
(let [parts (string/split (name sym) #"\.")
first (first parts)
step (fn [part] (str "['" part "']"))]
(apply str first (map step (rest parts)))))
(defn resolve-existing-var [env sym]
(if (= (namespace sym) "js")
{:name (js-var sym)}
(let [s (str sym)
lb (-> env :locals sym)
nm
(cond
lb (:name lb)
(namespace sym)
(let [ns (namespace sym)
ns (if (= "clojure.core" ns) "cljs.core" ns)
full-ns (resolve-ns-alias env ns)]
(confirm-var-exists env full-ns (symbol (name sym)))
(symbol (str full-ns "." (munge (name sym)))))
(.contains s ".")
(munge (let [idx (.indexOf s ".")
prefix (symbol (subs s 0 idx))
suffix (subs s idx)
lb (-> env :locals prefix)]
(if lb
(symbol (str (:name lb) suffix))
(do
(confirm-var-exists env prefix (symbol suffix))
sym))))
(get-in @namespaces [(-> env :ns :name) :uses sym])
(symbol (str (get-in @namespaces [(-> env :ns :name) :uses sym]) "." (munge (name sym))))
:else
(let [full-ns (if (core-name? env sym)
'cljs.core
(-> env :ns :name))]
(confirm-var-exists env full-ns sym)
(munge (symbol (str full-ns "." (munge (name sym)))))))]
{:name nm})))
(defn resolve-var [env sym]
(if (= (namespace sym) "js")
{:name (js-var sym)}
(let [s (str sym)
lb (-> env :locals sym)
nm
(cond
lb (:name lb)
(namespace sym)
(let [ns (namespace sym)
ns (if (= "clojure.core" ns) "cljs.core" ns)]
(symbol (str (resolve-ns-alias env ns) "." (munge (name sym)))))
(.contains s ".")
(munge (let [idx (.indexOf s ".")
prefix (symbol (subs s 0 idx))
suffix (subs s idx)
lb (-> env :locals prefix)]
(if lb
(symbol (str (:name lb) suffix))
sym)))
:else
(munge (symbol (str
(if (core-name? env sym)
'cljs.core
(-> env :ns :name))
"." (munge (name sym))))))]
{:name nm})))
(defn- comma-sep [xs]
(apply str (interpose "," xs)))
(defn- escape-char [^Character c]
(let [cp (.hashCode c)]
(case cp
; Handle printable escapes before ASCII
34 "\\\""
92 "\\\\"
; Handle non-printable escapes
8 "\\b"
12 "\\f"
10 "\\n"
13 "\\r"
9 "\\t"
(if (< 31 cp 127)
c ; Print simple ASCII characters
(format "\\u%04X" cp))))) ; Any other character is Unicode
(defn- escape-string [^CharSequence s]
(let [sb (StringBuilder. (count s))]
(doseq [c s]
(.append sb (escape-char c)))
(.toString sb)))
(defn- wrap-in-double-quotes [x]
(str \" x \"))
(defmulti emit-constant class)
(defmethod emit-constant nil [x] (print "null"))
(defmethod emit-constant Long [x] (print x))
(defmethod emit-constant Integer [x] (print x)) ; reader puts Integers in metadata
(defmethod emit-constant Double [x] (print x))
(defmethod emit-constant String [x]
(print (wrap-in-double-quotes (escape-string x))))
(defmethod emit-constant Boolean [x] (print (if x "true" "false")))
(defmethod emit-constant Character [x]
(print (wrap-in-double-quotes (escape-char x))))
(defmethod emit-constant java.util.regex.Pattern [x]
(let [[_ flags pattern] (re-find #"^(?:\(\?([idmsux]*)\))?(.*)" (str x))]
(print (str \/ (.replaceAll (re-matcher #"/" pattern) "\\\\/") \/ flags))))
(defmethod emit-constant clojure.lang.Keyword [x]
(print (str \" "\\uFDD0" \'
(if (namespace x)
(str (namespace x) "/") "")
(name x)
\")))
(defmethod emit-constant clojure.lang.Symbol [x]
(print (str \" "\\uFDD1" \'
(if (namespace x)
(str (namespace x) "/") "")
(name x)
\")))
(defn- emit-meta-constant [x string]
(if (meta x)
(do
(print (str "cljs.core.with_meta(" string ","))
(emit-constant (meta x))
(print ")"))
(print string)))
(defmethod emit-constant clojure.lang.PersistentList$EmptyList [x]
(emit-meta-constant x "cljs.core.List.EMPTY"))
(defmethod emit-constant clojure.lang.PersistentList [x]
(emit-meta-constant x
(str "cljs.core.list("
(comma-sep (map #(with-out-str (emit-constant %)) x))
")")))
(defmethod emit-constant clojure.lang.Cons [x]
(emit-meta-constant x
(str "cljs.core.list("
(comma-sep (map #(with-out-str (emit-constant %)) x))
")")))
(defmethod emit-constant clojure.lang.IPersistentVector [x]
(emit-meta-constant x
(str "cljs.core.vec(["
(comma-sep (map #(with-out-str (emit-constant %)) x))
"])")))
(defmethod emit-constant clojure.lang.IPersistentMap [x]
(emit-meta-constant x
(str "cljs.core.hash_map("
(comma-sep (map #(with-out-str (emit-constant %))
(apply concat x)))
")")))
(defmethod emit-constant clojure.lang.PersistentHashSet [x]
(emit-meta-constant x
(str "cljs.core.set(["
(comma-sep (map #(with-out-str (emit-constant %)) x))
"])")))
(defmulti emit :op)
(defn ^String emits [expr]
(with-out-str (emit expr)))
(defn emit-block
[context statements ret]
(if statements
(let [body (str (apply str (map emits statements)) (emits ret))]
(print body))
(emit ret)))
(defmacro emit-wrap [env & body]
`(let [env# ~env]
(when (= :return (:context env#)) (print "return "))
~@body
(when-not (= :expr (:context env#)) (print ";\n"))))
(defmethod emit :var
[{:keys [info env] :as arg}]
(emit-wrap env (print (munge (:name info)))))
(defmethod emit :meta
[{:keys [expr meta env]}]
(emit-wrap env
(print (str "cljs.core.with_meta(" (emits expr) "," (emits meta) ")"))))
(defmethod emit :map
[{:keys [children env simple-keys? keys vals]}]
(emit-wrap env
(if simple-keys?
(print (str "cljs.core.ObjMap.fromObject(["
(comma-sep (map emits keys)) ; keys
"],{"
(comma-sep (map (fn [k v] (str (emits k) ":" (emits v)))
keys vals)) ; js obj
"})"))
(print (str "cljs.core.HashMap.fromArrays(["
(comma-sep (map emits keys))
"],["
(comma-sep (map emits vals))
"])")))))
(defmethod emit :vector
[{:keys [children env]}]
(emit-wrap env
(print (str "cljs.core.PersistentVector.fromArray(["
(comma-sep (map emits children)) "])"))))
(defmethod emit :set
[{:keys [children env]}]
(emit-wrap env
(print (str "cljs.core.set(["
(comma-sep (map emits children)) "])"))))
(defmethod emit :constant
[{:keys [form env]}]
(when-not (= :statement (:context env))
(emit-wrap env (emit-constant form))))
(defmethod emit :if
[{:keys [test then else env]}]
(let [context (:context env)]
(if (= :expr context)
(print (str "(cljs.core.truth_(" (emits test) ")?" (emits then) ":" (emits else) ")"))
(print (str "if(cljs.core.truth_(" (emits test) "))\n{" (emits then) "} else\n{" (emits else) "}\n")))))
(defmethod emit :throw
[{:keys [throw env]}]
(if (= :expr (:context env))
(print (str "(function(){throw " (emits throw) "})()"))
(print (str "throw " (emits throw) ";\n"))))
(defn emit-comment
"Emit a nicely formatted comment string."
[doc jsdoc]
(let [docs (when doc [doc])
docs (if jsdoc (concat docs jsdoc) docs)
docs (remove nil? docs)]
(letfn [(print-comment-lines [e] (doseq [next-line (string/split-lines e)]
(println "*" (string/trim next-line))))]
(when (seq docs)
(println "/**")
(doseq [e docs]
(when e
(print-comment-lines e)))
(println "*/")))))
(defmethod emit :def
[{:keys [name init env doc export]}]
(when init
(emit-comment doc (:jsdoc init))
(print name)
(print (str " = " (emits init)))
(when-not (= :expr (:context env)) (print ";\n"))
(when export
(println (str "goog.exportSymbol('" export "', " name ");")))))
(defn emit-apply-to
[{:keys [name params env]}]
(let [arglist (gensym "arglist__")
delegate-name (str name "__delegate")]
(println (str "(function (" arglist "){"))
(doseq [[i param] (map-indexed vector (butlast params))]
(print (str "var " param " = cljs.core.first("))
(dotimes [_ i] (print "cljs.core.next("))
(print (str arglist ")"))
(dotimes [_ i] (print ")"))
(println ";"))
(if (< 1 (count params))
(do
(print (str "var " (last params) " = cljs.core.rest("))
(dotimes [_ (- (count params) 2)] (print "cljs.core.next("))
(print arglist)
(dotimes [_ (- (count params) 2)] (print ")"))
(println ");")
(println (str "return " delegate-name ".call(" (string/join ", " (cons "this" params)) ");")))
(do
(print (str "var " (last params) " = "))
(print "cljs.core.seq(" arglist ");")
(println ";")
(println (str "return " delegate-name ".call(" (string/join ", " (cons "this" params)) ");"))))
(print "})")))
(defn emit-fn-method
[{:keys [gthis name variadic params statements ret env recurs max-fixed-arity]}]
(emit-wrap env
(print (str "(function " name "(" (comma-sep params) "){\n"))
(when gthis
(println (str "var " gthis " = this;")))
(when recurs (print "while(true){\n"))
(emit-block :return statements ret)
(when recurs (print "break;\n}\n"))
(print "})")))
(defn emit-variadic-fn-method
[{:keys [gthis name variadic params statements ret env recurs max-fixed-arity] :as f}]
(emit-wrap env
(let [name (or name (gensym))
delegate-name (str name "__delegate")]
(println "(function() { ")
(println (str "var " delegate-name " = function (" (comma-sep params) "){"))
(when recurs (print "while(true){\n"))
(emit-block :return statements ret)
(when recurs (print "break;\n}\n"))
(println "};")
(print (str "var " name " = function (" (comma-sep
(if variadic
(concat (butlast params) ['var_args])
params)) "){\n"))
(when gthis
(println (str "var " gthis " = this;")))
(when variadic
(println (str "var " (last params) " = null;"))
(println (str "if (goog.isDef(var_args)) {"))
(println (str " " (last params) " = cljs.core.array_seq(Array.prototype.slice.call(arguments, " (dec (count params)) "),0);"))
(println (str "} ")))
(println (str "return " delegate-name ".call(" (string/join ", " (cons "this" params)) ");"))
(println "};")
(println (str name ".cljs$lang$maxFixedArity = " max-fixed-arity ";"))
(println (str name ".cljs$lang$applyTo = "
(with-out-str
(emit-apply-to (assoc f :name name)))
";"))
(println (str "return " name ";"))
(println "})()"))))
(defmethod emit :fn
[{:keys [name env methods max-fixed-arity variadic recur-frames loop-lets]}]
;;fn statements get erased, serve no purpose and can pollute scope if named
(when-not (= :statement (:context env))
(let [loop-locals (seq (concat
(mapcat :names (filter #(and % @(:flag %)) recur-frames))
(mapcat :names loop-lets)))]
(when loop-locals
(when (= :return (:context env))
(print "return "))
(println (str "((function (" (comma-sep loop-locals) "){"))
(when-not (= :return (:context env))
(print "return ")))
(if (= 1 (count methods))
(if variadic
(emit-variadic-fn-method (assoc (first methods) :name name))
(emit-fn-method (assoc (first methods) :name name)))
(let [name (or name (gensym))
maxparams (apply max-key count (map :params methods))
mmap (zipmap (repeatedly #(gensym (str name "__"))) methods)
ms (sort-by #(-> % second :params count) (seq mmap))]
(when (= :return (:context env))
(print "return "))
(println "(function() {")
(println (str "var " name " = null;"))
(doseq [[n meth] ms]
(println (str "var " n " = " (with-out-str (if (:variadic meth)
(emit-variadic-fn-method meth)
(emit-fn-method meth))) ";")))
(println (str name " = function(" (comma-sep (if variadic
(concat (butlast maxparams) ['var_args])
maxparams)) "){"))
(when variadic
(println (str "var " (last maxparams) " = var_args;")))
(println "switch(arguments.length){")
(doseq [[n meth] ms]
(if (:variadic meth)
(do (println "default:")
(println (str "return " n ".apply(this,arguments);")))
(let [pcnt (count (:params meth))]
(println "case " pcnt ":")
(println (str "return " n ".call(this" (if (zero? pcnt) nil
(str "," (comma-sep (take pcnt maxparams)))) ");")))))
(println "}")
(println "throw('Invalid arity: ' + arguments.length);")
(println "};")
(when variadic
(println (str name ".cljs$lang$maxFixedArity = " max-fixed-arity ";"))
(println (str name ".cljs$lang$applyTo = " (some #(let [[n m] %] (when (:variadic m) n)) ms) ".cljs$lang$applyTo;")))
(println (str "return " name ";"))
(println "})()")))
(when loop-locals
(println (str ";})(" (comma-sep loop-locals) "))"))))))
(defmethod emit :do
[{:keys [statements ret env]}]
(let [context (:context env)]
(when (and statements (= :expr context)) (print "(function (){"))
;(when statements (print "{\n"))
(emit-block context statements ret)
;(when statements (print "}"))
(when (and statements (= :expr context)) (print "})()"))))
(defmethod emit :try*
[{:keys [env try catch name finally]}]
(let [context (:context env)
subcontext (if (= :expr context) :return context)]
(if (or name finally)
(do
(when (= :expr context) (print "(function (){"))
(print "try{")
(let [{:keys [statements ret]} try]
(emit-block subcontext statements ret))
(print "}")
(when name
(print (str "catch (" name "){"))
(when catch
(let [{:keys [statements ret]} catch]
(emit-block subcontext statements ret)))
(print "}"))
(when finally
(let [{:keys [statements ret]} finally]
(assert (not= :constant (:op ret)) "finally block cannot contain constant")
(print "finally {")
(emit-block subcontext statements ret)
(print "}")))
(when (= :expr context) (print "})()")))
(let [{:keys [statements ret]} try]
(when (and statements (= :expr context)) (print "(function (){"))
(emit-block subcontext statements ret)
(when (and statements (= :expr context)) (print "})()"))))))
(defmethod emit :let
[{:keys [bindings statements ret env loop]}]
(let [context (:context env)
bs (map (fn [{:keys [name init]}]
(str "var " name " = " (emits init) ";\n"))
bindings)]
(when (= :expr context) (print "(function (){"))
(print (str (apply str bs) "\n"))
(when loop (print "while(true){\n"))
(emit-block (if (= :expr context) :return context) statements ret)
(when loop (print "break;\n}\n"))
;(print "}")
(when (= :expr context) (print "})()"))))
(defmethod emit :recur
[{:keys [frame exprs env]}]
(let [temps (vec (take (count exprs) (repeatedly gensym)))
names (:names frame)]
(print "{\n")
(dotimes [i (count exprs)]
(print (str "var " (temps i) " = " (emits (exprs i)) ";\n")))
(dotimes [i (count exprs)]
(print (str (names i) " = " (temps i) ";\n")))
(print "continue;\n")
(print "}\n")))
(defmethod emit :invoke
[{:keys [f args env]}]
(emit-wrap env
(print (str (emits f) ".call("
(comma-sep (cons "null" (map emits args)))
")"))))
(defmethod emit :new
[{:keys [ctor args env]}]
(emit-wrap env
(print (str "(new " (emits ctor) "("
(comma-sep (map emits args))
"))"))))
(defmethod emit :set!
[{:keys [target val env]}]
(emit-wrap env (print (str (emits target) " = "(emits val)))))
(defmethod emit :ns
[{:keys [name requires uses requires-macros env]}]
(println (str "goog.provide('" (munge name) "');"))
(when-not (= name 'cljs.core)
(println (str "goog.require('cljs.core');")))
(doseq [lib (into (vals requires) (distinct (vals uses)))]
(println (str "goog.require('" (munge lib) "');"))))
(defmethod emit :deftype*
[{:keys [t fields]}]
(let [fields (map munge fields)]
(println "\n/**\n* @constructor\n*/")
(println (str t " = (function (" (comma-sep (map str fields)) "){"))
(doseq [fld fields]
(println (str "this." fld " = " fld ";")))
(println "})")))
(defmethod emit :defrecord*
[{:keys [t fields]}]
(let [fields (concat (map munge fields) '[__meta __extmap])]
(println "\n/**\n* @constructor")
(doseq [fld fields]
(println (str "* @param {*} " fld)))
(println "* @param {*=} __meta \n* @param {*=} __extmap\n*/")
(println (str t " = (function (" (comma-sep (map str fields)) "){"))
(doseq [fld fields]
(println (str "this." fld " = " fld ";")))
(println (str "if(arguments.length>" (- (count fields) 2) "){"))
(println (str "this.__meta = __meta;"))
(println (str "this.__extmap = __extmap;"))
(println "} else {")
(print (str "this.__meta="))
(emit-constant nil)
(println ";")
(print (str "this.__extmap="))
(emit-constant nil)
(println ";")
(println "}")
(println "})")))
(defmethod emit :dot
[{:keys [target field method args env]}]
(emit-wrap env
(if field
(print (str (emits target) "." field))
(print (str (emits target) "." method "("
(comma-sep (map emits args))
")")))))
(defmethod emit :js
[{:keys [env code segs args]}]
(emit-wrap env
(if code
(print code)
(print (apply str (interleave (concat segs (repeat nil))
(concat (map emits args) [nil])))))))
(declare analyze analyze-symbol analyze-seq)
(def specials '#{if def fn* do let* loop* throw try* recur new set! ns deftype* defrecord* . js* & quote})
(def ^:dynamic *recur-frames* nil)
(def ^:dynamic *loop-lets* nil)
(defmacro disallowing-recur [& body]
`(binding [*recur-frames* (cons nil *recur-frames*)] ~@body))
(defn analyze-block
"returns {:statements .. :ret .. :children ..}"
[env exprs]
(let [statements (disallowing-recur
(seq (map #(analyze (assoc env :context :statement) %) (butlast exprs))))
ret (if (<= (count exprs) 1)
(analyze env (first exprs))
(analyze (assoc env :context (if (= :statement (:context env)) :statement :return)) (last exprs)))]
{:statements statements :ret ret :children (vec (cons ret statements))}))
(defmulti parse (fn [op & rest] op))
(defmethod parse 'if
[op env [_ test then else :as form] name]
(let [test-expr (disallowing-recur (analyze (assoc env :context :expr) test))
then-expr (analyze env then)
else-expr (analyze env else)]
{:env env :op :if :form form
:test test-expr :then then-expr :else else-expr
:children [test-expr then-expr else-expr]}))
(defmethod parse 'throw
[op env [_ throw :as form] name]
(let [throw-expr (disallowing-recur (analyze (assoc env :context :expr) throw))]
{:env env :op :throw :form form
:throw throw-expr
:children [throw-expr]}))
(defmethod parse 'try*
[op env [_ & body :as form] name]
(let [body (vec body)
catchenv (update-in env [:context] #(if (= :expr %) :return %))
tail (peek body)
fblock (when (and (seq? tail) (= 'finally (first tail)))
(rest tail))
finally (when fblock
(analyze-block
(assoc env :context :statement)
fblock))
body (if finally (pop body) body)
tail (peek body)
cblock (when (and (seq? tail)
(= 'catch (first tail)))
(rest tail))
name (first cblock)
locals (:locals catchenv)
mname (when name (munge name))
locals (if name
(assoc locals name {:name mname})
locals)
catch (when cblock
(analyze-block (assoc catchenv :locals locals) (rest cblock)))
body (if name (pop body) body)
try (when body
(analyze-block (if (or name finally) catchenv env) body))]
(when name (assert (not (namespace name)) "Can't qualify symbol in catch"))
{:env env :op :try* :form form
:try try
:finally finally
:name mname
:catch catch
:children [try {:name mname} catch finally]}))
(defmethod parse 'def
[op env form name]
(let [pfn (fn ([_ sym] {:sym sym})
([_ sym init] {:sym sym :init init})
([_ sym doc init] {:sym sym :doc doc :init init}))
args (apply pfn form)
sym (:sym args)]
(assert (not (namespace sym)) "Can't def ns-qualified name")
(let [name (munge (:name (resolve-var (dissoc env :locals) sym)))
init-expr (when (contains? args :init) (disallowing-recur
(analyze (assoc env :context :expr) (:init args) sym)))
export-as (when-let [export-val (-> sym meta :export)]
(if (= true export-val) name export-val))
doc (or (:doc args) (-> sym meta :doc))]
(swap! namespaces update-in [(-> env :ns :name) :defs sym]
(fn [m]
(let [m (assoc (or m {}) :name name)]
(if-let [line (:line env)]
(-> m
(assoc :file *cljs-file*)
(assoc :line line))
m))))
(merge {:env env :op :def :form form
:name name :doc doc :init init-expr}
(when init-expr {:children [init-expr]})
(when export-as {:export export-as})))))
(defn- analyze-fn-method [env locals meth]
(letfn [(uniqify [[p & r]]
(when p
(cons (if (some #{p} r) (gensym (str p)) p)
(uniqify r))))]
(let [params (first meth)
fields (-> params meta ::fields)
variadic (boolean (some '#{&} params))
params (uniqify (remove '#{&} params))
fixed-arity (count (if variadic (butlast params) params))
body (next meth)
gthis (and fields (gensym "this__"))
locals (reduce (fn [m fld]
(assoc m fld
{:name (symbol (str gthis "." (munge fld)))
:field true
:mutable (-> fld meta :mutable)}))
locals fields)
locals (reduce (fn [m name] (assoc m name {:name (munge name)})) locals params)
recur-frame {:names (vec (map munge params)) :flag (atom nil)}
block (binding [*recur-frames* (cons recur-frame *recur-frames*)]
(analyze-block (assoc env :context :return :locals locals) body))]
(merge {:env env :variadic variadic :params (map munge params) :max-fixed-arity fixed-arity :gthis gthis :recurs @(:flag recur-frame)} block))))
(defmethod parse 'fn*
[op env [_ & args] name]
(let [[name meths] (if (symbol? (first args))
[(first args) (next args)]
[name (seq args)])
;;turn (fn [] ...) into (fn ([]...))
meths (if (vector? (first meths)) (list meths) meths)
mname (when name (munge name))
locals (:locals env)
locals (if name (assoc locals name {:name mname}) locals)
menv (if (> (count meths) 1) (assoc env :context :expr) env)
methods (map #(analyze-fn-method menv locals %) meths)
max-fixed-arity (apply max (map :max-fixed-arity methods))
variadic (boolean (some :variadic methods))]
;;todo - validate unique arities, at most one variadic, variadic takes max required args
{:env env :op :fn :name mname :methods methods :variadic variadic
:recur-frames *recur-frames* :loop-lets *loop-lets*
:jsdoc [(when variadic "@param {...*} var_args")]
:max-fixed-arity max-fixed-arity}))
(defmethod parse 'do
[op env [_ & exprs] _]
(merge {:env env :op :do} (analyze-block env exprs)))
(defn analyze-let
[encl-env [_ bindings & exprs :as form] is-loop]
(assert (and (vector? bindings) (even? (count bindings))) "bindings must be vector of even number of elements")
(let [context (:context encl-env)
[bes env]
(disallowing-recur
(loop [bes []
env (assoc encl-env :context :expr)
bindings (seq (partition 2 bindings))]
(if-let [[name init] (first bindings)]
(do
(assert (not (or (namespace name) (.contains (str name) "."))) (str "Invalid local name: " name))
(let [init-expr (analyze env init)
be {:name (gensym (str (munge name) "__")) :init init-expr}]
(recur (conj bes be)
(assoc-in env [:locals name] be)
(next bindings))))
[bes env])))
recur-frame (when is-loop {:names (vec (map :name bes)) :flag (atom nil)})
{:keys [statements ret children]}
(binding [*recur-frames* (if recur-frame (cons recur-frame *recur-frames*) *recur-frames*)
*loop-lets* (cond
is-loop (or *loop-lets* ())
*loop-lets* (cons {:names (vec (map :name bes))} *loop-lets*))]
(analyze-block (assoc env :context (if (= :expr context) :return context)) exprs))]
{:env encl-env :op :let :loop is-loop
:bindings bes :statements statements :ret ret :form form :children (into [children] (map :init bes))}))
(defmethod parse 'let*
[op encl-env form _]
(analyze-let encl-env form false))
(defmethod parse 'loop*
[op encl-env form _]
(analyze-let encl-env form true))
(defmethod parse 'recur
[op env [_ & exprs] _]
(let [context (:context env)
frame (first *recur-frames*)]
(assert frame "Can't recur here")
(assert (= (count exprs) (count (:names frame))) "recur argument count mismatch")
(reset! (:flag frame) true)
(assoc {:env env :op :recur}
:frame frame
:exprs (disallowing-recur (vec (map #(analyze (assoc env :context :expr) %) exprs))))))
(defmethod parse 'quote
[_ env [_ x] _]
{:op :constant :env env :form x})
(defmethod parse 'new
[_ env [_ ctor & args] _]
(disallowing-recur
(let [enve (assoc env :context :expr)
ctorexpr (analyze enve ctor)
argexprs (vec (map #(analyze enve %) args))]
{:env env :op :new :ctor ctorexpr :args argexprs :children (conj argexprs ctorexpr)})))
(defmethod parse 'set!
[_ env [_ target val] _]
(disallowing-recur
(let [enve (assoc env :context :expr)
targetexpr (if (symbol? target)
(do
(let [local (-> env :locals target)]
(assert (or (nil? local)
(and (:field local)
(:mutable local)))
"Can't set! local var or non-mutable field"))
(analyze-symbol enve target))
(when (seq? target)
(let [targetexpr (analyze-seq enve target nil)]
(when (:field targetexpr)
targetexpr))))
valexpr (analyze enve val)]
(assert targetexpr "set! target must be a field or a symbol naming a var")
{:env env :op :set! :target targetexpr :val valexpr :children [targetexpr valexpr]})))
(defmethod parse 'ns
[_ env [_ name & args] _]
(let [excludes
(reduce (fn [s [k exclude xs]]
(if (= k :refer-clojure)
(do
(assert (= exclude :exclude) "Only [:refer-clojure :exclude [names]] form supported")
(into s xs))
s))
#{} args)
{uses :use requires :require uses-macros :use-macros requires-macros :require-macros :as params}
(reduce (fn [m [k & libs]]
(assert (#{:use :use-macros :require :require-macros} k)
"Only :refer-clojure, :require, :require-macros, :use and :use-macros libspecs supported")
(assoc m k (into {}
(mapcat (fn [[lib kw expr]]
(case k
(:require :require-macros)
(do (assert (and expr (= :as kw))
"Only (:require [lib.ns :as alias]*) form of :require / :require-macros is supported")
[[expr lib]])
(:use :use-macros)
(do (assert (and expr (= :only kw))
"Only (:use [lib.ns :only [names]]*) form of :use / :use-macros is supported")
(map vector expr (repeat lib)))))
libs))))
{} (remove (fn [[r]] (= r :refer-clojure)) args))]
(set! *cljs-ns* name)
(require 'cljs.core)
(doseq [nsym (concat (vals requires-macros) (vals uses-macros))]
(clojure.core/require nsym))
(swap! namespaces #(-> %
(assoc-in [name :name] name)
(assoc-in [name :excludes] excludes)
(assoc-in [name :uses] uses)
(assoc-in [name :requires] requires)
(assoc-in [name :uses-macros] uses-macros)
(assoc-in [name :requires-macros]
(into {} (map (fn [[alias nsym]]
[alias (find-ns nsym)])
requires-macros)))))
{:env env :op :ns :name name :uses uses :requires requires
:uses-macros uses-macros :requires-macros requires-macros :excludes excludes}))
(defmethod parse 'deftype*
[_ env [_ tsym fields] _]
(let [t (munge (:name (resolve-var (dissoc env :locals) tsym)))]
(swap! namespaces update-in [(-> env :ns :name) :defs tsym]
(fn [m]
(let [m (assoc (or m {}) :name t)]
(if-let [line (:line env)]
(-> m
(assoc :file *cljs-file*)
(assoc :line line))
m))))
{:env env :op :deftype* :t t :fields fields}))
(defmethod parse 'defrecord*
[_ env [_ tsym fields] _]
(let [t (munge (:name (resolve-var (dissoc env :locals) tsym)))]
(swap! namespaces update-in [(-> env :ns :name) :defs tsym]
(fn [m]
(let [m (assoc (or m {}) :name t)]
(if-let [line (:line env)]
(-> m
(assoc :file *cljs-file*)
(assoc :line line))
m))))
{:env env :op :defrecord* :t t :fields fields}))
;; dot accessor code
(def ^:private property-symbol? #(boolean (and (symbol? %) (re-matches #"^-.*" (name %)))))
(defn- clean-symbol
[sym]
(symbol
(if (property-symbol? sym)
(-> sym name (.substring 1) munge)
(-> sym name munge))))
(defn- classify-dot-form
[[target member args]]
[(cond (nil? target) ::error
:default ::expr)
(cond (property-symbol? member) ::property
(symbol? member) ::symbol
(seq? member) ::list
:default ::error)
(cond (nil? args) ()
:default ::expr)])
(defmulti build-dot-form #(classify-dot-form %))
;; (. o -p)
;; (. (...) -p)
(defmethod build-dot-form [::expr ::property ()]
[[target prop _]]
{:dot-action ::access :target target :field (clean-symbol prop)})
;; (. o -p <args>)
(defmethod build-dot-form [::expr ::property ::list]
[[target prop args]]
(throw (Error. (str "Cannot provide arguments " args " on property access " prop))))
(defn- build-method-call
"Builds the intermediate method call map used to reason about the parsed form during
compilation."
[target meth args]
(if (symbol? meth)
{:dot-action ::call :target target :method (munge meth) :args args}
{:dot-action ::call :target target :method (munge (first meth)) :args args}))
;; (. o m 1 2)
(defmethod build-dot-form [::expr ::symbol ::expr]
[[target meth args]]
(build-method-call target meth args))
;; (. o m)
(defmethod build-dot-form [::expr ::symbol ()]
[[target meth args]]
(build-method-call target meth args))
;; (. o (m))
;; (. o (m 1 2))
(defmethod build-dot-form [::expr ::list ()]
[[target meth-expr _]]
(build-method-call target (first meth-expr) (rest meth-expr)))
(defmethod build-dot-form :default
[dot-form]
(throw (Error. (str "Unknown dot form of " (list* '. dot-form) " with classification " (classify-dot-form dot-form)))))
(defmethod parse '.
[_ env [_ target & [field & member+]] _]
(disallowing-recur
(let [{:keys [dot-action target method field args]} (build-dot-form [target field member+])
enve (assoc env :context :expr)
targetexpr (analyze enve target)
children [enve]]
(case dot-action
::access {:env env :op :dot :children children
:target targetexpr
:field field}
::call (let [argexprs (map #(analyze enve %) args)]
{:env env :op :dot :children (into children argexprs)
:target targetexpr
:method method
:args argexprs})))))
(defmethod parse 'js*
[op env [_ form & args] _]
(assert (string? form))
(if args
(disallowing-recur
(let [seg (fn seg [^String s]
(let [idx (.indexOf s "~{")]