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(ns lang.parser
(:require [clojure.core.match :refer [match]]
(lang [util :as &util :refer [exec return* return fail fail*
repeat-m try-m try-all-m map-m
apply-m]]
[lexer :as &lexer])))
(declare parse-form)
;; [Utils]
(defmacro ^:private defparser [name match return]
`(def ~name
(fn [[token# & left#]]
(match token#
~match
(~return left#)
_#
(fail* (str "Unmatched token: " token#))))))
;; [Parsers]
(defparser ^:private parse-int
[::&lexer/int ?int]
(return [::int (Long/parseLong ?int)]))
(defparser ^:private parse-float
[::&lexer/float ?float]
(return [::float (Double/parseDouble ?float)]))
(defparser ^:private parse-ident
[::&lexer/ident ?ident]
(return [::ident ?ident]))
(defparser ^:private parse-tuple
[::&lexer/tuple ?parts]
(exec [=parts (map-m (fn [arg] (apply-m parse-form (list arg)))
?parts)]
(return [::tuple =parts])))
(defparser ^:private parse-record
[::&lexer/record ?parts]
(exec [=kvs (do (assert (even? (count ?parts)))
(map-m #(match %
([[::&lexer/tag ?label] ?value] :seq)
(exec [=value (apply-m parse-form (list ?value))]
(return [?label =value])))
(partition 2 ?parts)))]
(return [::record =kvs])))
(defparser ^:private parse-def
[::&lexer/list ([[::&lexer/ident "def"] ?name ?body] :seq)]
(exec [=name (apply-m parse-form (list ?name))
=body (apply-m parse-form (list ?body))]
(return [::def =name =body])))
(defparser ^:private parse-defdata
[::&lexer/list ([[::&lexer/ident "defdata"] ?type & ?cases] :seq)]
(exec [=type (apply-m parse-form (list ?type))
=cases (map-m (fn [arg]
(match arg
[::&lexer/list ([[::&lexer/tag ?tag] ?data] :seq)]
(exec [=data (apply-m parse-form (list ?data))]
(return [::tagged ?tag =data]))
))
?cases)]
(return [::defdata =type =cases])))
(defparser ^:private parse-if
[::&lexer/list ([[::&lexer/ident "if"] ?test ?then ?else] :seq)]
(exec [=test (apply-m parse-form (list ?test))
=then (apply-m parse-form (list ?then))
=else (apply-m parse-form (list ?else))]
(return [::if =test =then =else])))
(defparser ^:private parse-case
[::&lexer/list ([[::&lexer/ident "case"] ?variant & cases] :seq)]
(exec [=variant (apply-m parse-form (list ?variant))
=branches (do (assert (even? (count cases)))
(map-m (fn [[destruct expr]]
(exec [=destruct (apply-m parse-form (list destruct))
=expr (apply-m parse-form (list expr))]
(return [::case-branch =destruct =expr])))
(partition 2 cases)))]
(return [::case =variant =branches])))
(defparser ^:private parse-let
[::&lexer/list ([[::&lexer/ident "let"] [::&lexer/tuple ?bindings] ?expr] :seq)]
(exec [=expr (apply-m parse-form (list ?expr))
=bindings (do (assert (even? (count ?bindings)))
(map-m (fn [[destruct expr]]
(exec [=destruct (apply-m parse-form (list destruct))
=expr (apply-m parse-form (list expr))]
(return [::let-binding =destruct =expr])))
(partition 2 ?bindings)))]
(return [::let =bindings =expr])))
(defparser ^:private parse-tagged
[::&lexer/list ([[::&lexer/tag ?tag] ?data] :seq)]
(exec [=data (apply-m parse-form (list ?data))]
(return [::tagged ?tag =data])))
(defparser ^:private parse-get
[::&lexer/list ([[::&lexer/ident "get@"] [::&lexer/tag ?tag] ?record] :seq)]
(exec [=record (apply-m parse-form (list ?record))]
(return [::get ?tag =record])))
(defparser ^:private parse-remove
[::&lexer/list ([[::&lexer/ident "remove@"] [::&lexer/tag ?tag] ?record] :seq)]
(exec [=record (apply-m parse-form (list ?record))]
(return [::remove ?tag =record])))
(defparser ^:private parse-set
[::&lexer/list ([[::&lexer/ident "set@"] [::&lexer/tag ?tag] ?value ?record] :seq)]
(exec [=value (apply-m parse-form (list ?value))
=record (apply-m parse-form (list ?record))]
(return [::set ?tag =value =record])))
(defparser ^:private parse-static-access
[::&lexer/list ([[::&lexer/ident "_.."] [::&lexer/ident ?class] [::&lexer/ident ?member]] :seq)]
(return [::static-access ?class ?member]))
(defparser ^:private parse-dynamic-access
[::&lexer/list ([[::&lexer/ident "_."] ?object ?call] :seq)]
(exec [=object (apply-m parse-form (list ?object))
=call (apply-m parse-form (list ?call))]
(return [::dynamic-access =object =call])))
(defparser ^:private parse-string
[::&lexer/string ?string]
(return [::string ?string]))
(defparser ^:private parse-fn-call
[::&lexer/list ([?f & ?args] :seq)]
(exec [=f (apply-m parse-form (list ?f))
=args (map-m (fn [arg] (apply-m parse-form (list arg)))
?args)]
(return [::fn-call =f =args])))
(def ^:private parse-form
(try-all-m [parse-int
parse-float
parse-string
parse-ident
parse-tuple
parse-record
parse-def
parse-defdata
parse-if
parse-case
parse-let
parse-tagged
parse-get
parse-set
parse-remove
parse-static-access
parse-dynamic-access
parse-fn-call]))
;; [Interface]
(defn parse [text]
(match ((repeat-m parse-form) text)
[::&util/ok [?state ?forms]]
(if (empty? ?state)
?forms
(assert false (str "Unconsumed input: " (pr-str ?state))))
[::&util/failure ?message]
(assert false ?message)))
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