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|
(ns lux.host.generics
(:require (clojure [string :as string]
[template :refer [do-template]])
clojure.core.match
clojure.core.match.array
(lux [base :as & :refer [|do return* return |let |case]]))
(:import java.util.regex.Pattern))
(declare gclass->signature)
(do-template [<name> <old-sep> <new-sep>]
(let [regex (-> <old-sep> Pattern/quote re-pattern)]
(defn <name> [old]
(string/replace old regex <new-sep>)))
;; ->class
^String ->bytecode-class-name "." "/"
;; ->class-name
^String ->class-name "/" "."
)
;; ->type-signature
(defn ->type-signature [class]
(case class
"void" "V"
"boolean" "Z"
"byte" "B"
"short" "S"
"int" "I"
"long" "J"
"float" "F"
"double" "D"
"char" "C"
;; else
(let [class* (->bytecode-class-name class)]
(if (.startsWith class* "[")
class*
(str "L" class* ";")))
))
(defn super-class-name [super]
"(-> GenericSuperClassDecl Text)"
(|let [[super-name super-params] super]
super-name))
(defn formal-type-parameter->signature [param]
(|let [[pname pbounds] param]
(|case pbounds
(&/$Nil)
pname
_
(->> pbounds
(&/|map (fn [pbound] (str ": " (gclass->signature pbound))))
(&/|interpose " ")
(str pname " "))
)))
(defn formal-type-parameters->signature [params]
(if (&/|empty? params)
""
(str "<" (->> params (&/|map formal-type-parameter->signature) (&/|interpose " ") (&/fold str "")) ">")))
(defn gclass->signature [super]
"(-> GenericClass Text)"
(|case super
(&/$GenericTypeVar name)
(str "T" name ";")
(&/$GenericWildcard (&/$None))
"*"
(&/$GenericWildcard (&/$Some [(&/$UpperBound) ?bound]))
(str "+" (gclass->signature ?bound))
(&/$GenericWildcard (&/$Some [(&/$LowerBound) ?bound]))
(str "-" (gclass->signature ?bound))
(&/$GenericClass ^String name params)
(case name
"void" "V"
"boolean" "Z"
"byte" "B"
"short" "S"
"int" "I"
"long" "J"
"float" "F"
"double" "D"
"char" "C"
;; else
(if (.startsWith name "[")
name
(let [params* (if (&/|empty? params)
""
(str "<" (->> params (&/|map gclass->signature) (&/|interpose "") (&/fold str "")) ">"))]
(str "L" (->bytecode-class-name name) params* ";"))))
(&/$GenericArray param)
(str "[" (gclass->signature param))))
(defn gsuper-decl->signature [super]
"(-> GenericSuperClassDecl Text)"
(|let [[super-name super-params] super
params* (if (&/|empty? super-params)
""
(str "<" (->> super-params (&/|map gclass->signature) (&/|interpose " ") (&/fold str "")) ">"))]
(str "L" (->bytecode-class-name super-name) params* ";")))
(defn gclass-decl->signature [class-decl supers]
"(-> GenericClassDecl (List GenericSuperClassDecl) Text)"
(|let [[class-name class-vars] class-decl
vars-section (formal-type-parameters->signature class-vars)
super-section (->> (&/|map gsuper-decl->signature supers) (&/|interpose " ") (&/fold str ""))]
(str vars-section super-section)))
(let [object-simple-signature (->type-signature "java.lang.Object")]
(defn gclass->simple-signature [gclass]
"(-> GenericClass Text)"
(|case gclass
(&/$GenericTypeVar name)
object-simple-signature
(&/$GenericWildcard _)
object-simple-signature
(&/$GenericClass name params)
(->type-signature name)
(&/$GenericArray param)
(str "[" (gclass->simple-signature param))
_
(assert false (str 'gclass->simple-signature " " (&/adt->text gclass))))))
(defn gclass->class-name [gclass]
"(-> GenericClass Text)"
(|case gclass
(&/$GenericTypeVar name)
(->bytecode-class-name "java.lang.Object")
(&/$GenericWildcard _)
(->bytecode-class-name "java.lang.Object")
(&/$GenericClass name params)
(->bytecode-class-name name)
(&/$GenericArray param)
(str "[" (gclass->class-name param))
_
(assert false (str 'gclass->class-name " " (&/adt->text gclass)))))
(let [object-bc-name (->bytecode-class-name "java.lang.Object")]
(defn gclass->bytecode-class-name* [gclass type-env]
"(-> GenericClass Text)"
(|case gclass
(&/$GenericTypeVar name)
object-bc-name
(&/$GenericWildcard _)
object-bc-name
(&/$GenericClass name params)
;; When referring to type-parameters during class or method
;; definition, a type-environment is set for storing the names
;; of such parameters.
;; When a "class" shows up with the name of one of those
;; parameters, it must be detected, and the bytecode class-name
;; must correspond to Object's.
(if (&/|get name type-env)
object-bc-name
(->bytecode-class-name name))
(&/$GenericArray param)
(assert false "gclass->bytecode-class-name* does not work on arrays."))))
(let [object-bc-name (->bytecode-class-name "java.lang.Object")]
(defn gclass->bytecode-class-name [gclass]
"(-> GenericClass Text)"
(|case gclass
(&/$GenericTypeVar name)
object-bc-name
(&/$GenericWildcard _)
object-bc-name
(&/$GenericClass name params)
(->bytecode-class-name name)
(&/$GenericArray param)
(assert false "gclass->bytecode-class-name does not work on arrays."))))
(defn method-signatures [method-decl]
(|let [[=name =anns =gvars =exceptions =inputs =output] method-decl
simple-signature (str "(" (&/fold str "" (&/|map gclass->simple-signature =inputs)) ")" (gclass->simple-signature =output))
generic-signature (str (formal-type-parameters->signature =gvars)
"(" (&/fold str "" (&/|map gclass->signature =inputs)) ")"
(gclass->signature =output)
(->> =exceptions (&/|map gclass->signature) (&/|interpose " ") (&/fold str "")))]
(&/T [simple-signature generic-signature])))
|
