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;; function set in the prototype via its identity, i.e.
;; (local blah (meta-fn :blah)
;; (blah (setmetadata {} {blah (fn [] 4)})) ;; -> 4
(fn meta-fn [name]
(local x {})
(setmetatable
x
{:__call (fn [_ obj ...] ((. (getmetatable obj) x) ...))
:__name name
:__fennelview (fn [] [name])}))
(fn meta-method [name]
(local x {})
(setmetatable
x
{:__call (fn [_ obj ...] ((. (getmetatable obj) x) obj ...))
:__name name
:__fennelview (fn [] [name])}))
;; function set in the prototype via its identity, i.e.
;; (local blah (meta-fn :blah)
;; however, these functions are optional, and nop if left out
;; (blah (setmetadata {} {})) ;; -> nil
(fn meta-fn-opt [name fallback]
(local x {})
(setmetatable
x
{:__call (fn [_ obj ...] (if (and (getmetatable obj)
(. (getmetatable obj) x))
((. (getmetatable obj) x) ...)
fallback
(fallback ...)
nil))
:__name name
:__fennelview (fn [] [name])}))
(fn meta-method-opt [name fallback]
(local x {})
(setmetatable
x
{:__call (fn [_ obj ...] (if (and (getmetatable obj)
(. (getmetatable obj) x))
((. (getmetatable obj) x) obj ...)
fallback
(fallback obj ...)
nil))
:__name name
:__fennelview (fn [] [name])}))
;; value set in the table via its identity, i.e.
;; (local blah (table-value :blah))
;; (blah {blah 4}) ;; -> (. {blah 4} blah) -> 4
(fn table-value [name]
(local x {})
(setmetatable
x
{:__call (fn [_ obj ...] (. obj x))
:__name name
:__fennelview (fn [] [name])}))
(fn table-fn [name]
(local x {})
(setmetatable
x
{:__call (fn [_ obj ...] ((. obj x) ...))
:__name name
:__fennelview (fn [] [name])}))
;; methods have an extra "self" param
(fn table-method [name]
(local x {})
(setmetatable
x
{:__call (fn [_ obj ...] ((. obj x) obj ...))
:__name name
:__fennelview (fn [] [name])}))
{: meta-fn : meta-fn-opt : meta-method : meta-method-opt : table-value : table-fn : table-method}
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