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|
(ns lux.parser
(:require [clojure.template :refer [do-template]]
[clojure.core.match :as M :refer [matchv]]
clojure.core.match.array
(lux [base :as & :refer [|do return fail]]
[lexer :as &lexer])))
;; [Utils]
(do-template [<name> <close-tag> <description> <tag>]
(defn <name> [parse]
(|do [elems (&/repeat% parse)
token &lexer/lex]
(matchv ::M/objects [token]
[["lux;Meta" [meta [<close-token> _]]]]
(return (&/V <tag> (&/fold &/|++ (&/|list) elems)))
[_]
(fail (str "[Parser Error] Unbalanced " <description> ".")))))
^:private parse-form "Close_Paren" "parantheses" "lux;Form"
^:private parse-tuple "Close_Bracket" "brackets" "lux;Tuple"
)
(defn ^:private parse-record [parse]
(|do [;; :let [_ (prn 'parse-record 0)]
elems* (&/repeat% parse)
;; :let [_ (prn 'parse-record 1)]
token &lexer/lex
;; :let [_ (prn 'parse-record 2)]
:let [elems (&/fold &/|++ (&/|list) elems*)]
;; :let [_ (prn 'parse-record 3)]
]
(matchv ::M/objects [token]
[["lux;Meta" [meta ["Close_Brace" _]]]]
(if (even? (&/|length elems))
(do ;; (prn 'PARSED_RECORD (&/|length elems))
(return (&/V "lux;Record" (&/|as-pairs elems))))
(fail (str "[Parser Error] Records must have an even number of elements.")))
[_]
(fail (str "[Parser Error] Unbalanced braces.")))))
;; [Interface]
(def parse
(|do [token &lexer/lex
;; :let [_ (prn 'parse/token token)]
;; :let [_ (prn 'parse (aget token 0))]
]
(matchv ::M/objects [token]
[["lux;Meta" [meta ["White_Space" _]]]]
(return (&/|list))
[["lux;Meta" [meta ["Comment" _]]]]
(return (&/|list))
[["lux;Meta" [meta ["Bool" ?value]]]]
(return (&/|list (&/V "lux;Meta" (&/T meta (&/V "lux;Bool" (Boolean/parseBoolean ?value))))))
[["lux;Meta" [meta ["Int" ?value]]]]
(return (&/|list (&/V "lux;Meta" (&/T meta (&/V "lux;Int" (Integer/parseInt ?value))))))
[["lux;Meta" [meta ["Real" ?value]]]]
(return (&/|list (&/V "lux;Meta" (&/T meta (&/V "lux;Real" (Float/parseFloat ?value))))))
[["lux;Meta" [meta ["Char" ?value]]]]
(return (&/|list (&/V "lux;Meta" (&/T meta (&/V "lux;Char" (.charAt ?value 0))))))
[["lux;Meta" [meta ["Text" ?value]]]]
(return (&/|list (&/V "lux;Meta" (&/T meta (&/V "lux;Text" ?value)))))
[["lux;Meta" [meta ["Symbol" ?ident]]]]
(return (&/|list (&/V "lux;Meta" (&/T meta (&/V "lux;Symbol" ?ident)))))
[["lux;Meta" [meta ["Tag" ?ident]]]]
(return (&/|list (&/V "lux;Meta" (&/T meta (&/V "lux;Tag" ?ident)))))
[["lux;Meta" [meta ["Open_Paren" _]]]]
(|do [syntax (parse-form parse)]
(return (&/|list (&/V "lux;Meta" (&/T meta syntax)))))
[["lux;Meta" [meta ["Open_Bracket" _]]]]
(|do [syntax (parse-tuple parse)]
(return (&/|list (&/V "lux;Meta" (&/T meta syntax)))))
[["lux;Meta" [meta ["Open_Brace" _]]]]
(|do [syntax (parse-record parse)]
(return (&/|list (&/V "lux;Meta" (&/T meta syntax)))))
[_]
(fail "[Parser Error] Unknown lexer token.")
)))
|
