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(require-macros :macros.fn)
(local core {})
(local unpack (or table.unpack _G.unpack))
(local insert table.insert)
(local meta-enabled (pcall _SCOPE.specials.doc (list (sym :doc) (sym :doc)) _SCOPE _CHUNK))
(fn multisym->sym [s]
(if (multi-sym? s)
(values (sym (string.gsub (tostring s) ".*[.]" "")) true)
(values s false)))
(fn check-bindings [bindings]
(and (assert-compile (sequence? bindings) "expected binding table" [])
(assert-compile (= (length bindings) 2) "expected exactly two forms in binding vector." bindings)))
(fn* core.if-let
([bindings then]
(if-let bindings then nil))
([bindings then else]
(check-bindings bindings)
(let [[form test] bindings]
`(let [tmp# ,test]
(if tmp#
(let [,form tmp#]
,then)
,else)))))
(fn* core.when-let
[bindings & body]
(check-bindings bindings)
(let [[form test] bindings]
`(let [tmp# ,test]
(if tmp#
(let [,form tmp#]
,(unpack body))))))
(fn* core.if-some
([bindings then]
(if-some bindings then nil))
([bindings then else]
(check-bindings bindings)
(let [[form test] bindings]
`(let [tmp# ,test]
(if (= tmp# nil)
,else
(let [,form tmp#]
,then))))))
(fn* core.when-some
[bindings & body]
(check-bindings bindings)
(let [[form test] bindings]
`(let [tmp# ,test]
(if (= tmp# nil)
nil
(let [,form tmp#]
,(unpack body))))))
(fn table-type [tbl]
(if (sequence? tbl) :seq
(table? tbl) :table
:else))
(fn table-type-fn []
`(fn [tbl#]
(let [t# (type tbl#)]
(if (= t# :table)
(let [(k# _#) (next tbl#)]
(if (and (= (type k#) :number) (= k# 1)) :seq
(= k# nil) :empty
:table))
:else))))
(fn seq-fn []
`(fn [tbl#]
(var assoc# false)
(let [res# []
insert# table.insert]
(each [k# v# (pairs tbl#)]
(if (and (not assoc#)
(not (= (type k#) :number)))
(set assoc# true))
(insert# res# [k# v#]))
(if assoc# res# tbl#))))
(fn& core.into [to from]
(let [to-type (table-type to)
from-type (table-type from)]
(if (and (= to-type :seq) (= from-type :seq))
`(let [to# ,to
insert# table.insert]
(each [_# v# (ipairs ,from)]
(insert# to# v#))
to#)
(= to-type :seq)
`(let [to# ,to
seq# ,(seq-fn)
insert# table.insert]
(each [_# v# (ipairs (seq# ,from))]
(insert# to# v#))
to#)
(and (= to-type :table) (= from-type :seq))
`(let [to# ,to]
(each [_# [k# v#] (ipairs ,from)]
(tset to# k# v#))
to#)
(and (= to-type :table) (= from-type :table))
`(let [to# ,to
from# ,from]
(each [k# v# (pairs from#)]
(tset to# k# v#))
to#)
(= to-type :table)
`(let [to# ,to
from# ,from]
(match (,(table-type-fn) from#)
:seq (each [_# [k# v#] (ipairs from#)]
(tset to# k# v#))
:table (each [k# v# (pairs from#)]
(tset to# k# v#))
:else (error "expected table as second argument"))
to#)
`(let [to# ,to
from# ,from
insert# table.insert
table-type# ,(table-type-fn)
seq# ,(seq-fn)]
(match (table-type# to#)
:seq (each [_# v# (ipairs (seq# from#))]
(insert# to# v#))
:table (match (table-type# from#)
:seq (each [_# [k# v#] (ipairs from#)]
(tset to# k# v#))
:table (each [k# v# (pairs from#)]
(tset to# k# v#))
:else (error "expected table as second argument"))
;; If we could not deduce type, it means that
;; we've got empty table. We use will default
;; to sequential table, because it will never
;; break when converting into
:empty (each [_# v# (ipairs (seq# from#))]
(insert# to# v#))
:else (error "expected table as first argument"))
to#))))
(fn first [tbl]
(. tbl 1))
(fn rest [tbl]
[(unpack tbl 2)])
(fn string? [x]
(= (type x) :string))
(fn& core.when-meta [...]
(when meta-enabled `(do ,...)))
(fn* core.with-meta [val meta]
(if (not meta-enabled) val
`(let [val# ,val
(res# fennel#) (pcall require :fennel)]
(if res#
(each [k# v# (pairs ,meta)]
(fennel#.metadata:set val# k# v#)))
val#)))
(fn* core.meta [v]
(when-meta
`(let [(res# fennel#) (pcall require :fennel)]
(if res# (. fennel#.metadata ,v)))))
(fn* core.defmulti
[name & opts]
(let [docstring (if (string? (first opts)) (first opts))
opts (if docstring (rest opts) opts)
dispatch-fn (first opts)]
(if (in-scope? name)
nil
`(local ,name
(let [multimethods# {}]
(setmetatable
,(with-meta {} {:fnl/docstring docstring})
{:__call
(fn [_# ...]
,docstring
(let [dispatch-value# (,dispatch-fn ...)]
((or (. multimethods# dispatch-value#)
(. multimethods# :default)
(error (.. "No method in multimethod '"
,(tostring name)
"' for dispatch value: "
dispatch-value#) 2)) ...)))
:multimethods multimethods#}))))))
(fn* core.defmethod
[multifn dispatch-val & fn-tail]
`(let [multifn# ,multifn]
(tset (. (getmetatable multifn#) :multimethods)
,dispatch-val
(fn ,(unpack fn-tail)))
multifn#))
(fn* core.def
([name expr] (def {} name expr))
([attr-map name expr]
(let [attr-map (if (table? attr-map) attr-map
(string? attr-map) {attr-map true}
(error "def: expected keyword or literal table as first argument" 2))
(s multi) (multisym->sym name)
docstring (or (. attr-map :doc)
(. attr-map :fnl/docstring))
f (if (. attr-map :dynamic) 'var 'local)]
(if multi
`(,f ,s (do (,f ,s ,expr)
(set ,name ,s)
,(with-meta s {:fnl/docstring docstring})))
`(,f ,name ,(with-meta expr {:fnl/docstring docstring}))))))
(fn* core.defonce
([name expr]
(defonce {} name expr))
([attr-map name expr]
(if (in-scope? name)
nil
(def attr-map name expr))))
core
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