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|
(ns lux.lexer
(:require [clojure.template :refer [do-template]]
(lux [base :as & :refer [|do return* return fail fail*]]
[reader :as &reader])
[lux.analyser.module :as &module]))
;; [Utils]
(defn ^:private escape-char [escaped]
(condp = escaped
"\\t" (return "\t")
"\\b" (return "\b")
"\\n" (return "\n")
"\\r" (return "\r")
"\\f" (return "\f")
"\\\"" (return "\"")
"\\\\" (return "\\")
;; else
(fail (str "[Lexer Error] Unknown escape character: " escaped))))
(defn ^:private lex-text-body [_]
(&/try-all% (&/|list (|do [[_ [prefix escaped]] (&reader/read-regex2 #"(?s)^([^\"\\]*)(\\.)")
unescaped (escape-char escaped)
postfix (lex-text-body nil)]
(return (str prefix unescaped postfix)))
(|do [[_ body] (&reader/read-regex #"(?s)^([^\"\\]*)")]
(return body)))))
(def ^:private +ident-re+ #"^([a-zA-Z\-\+\_\=!@$%^&*<>\.,/\\\|'`:\~\?][0-9a-zA-Z\-\+\_\=!@$%^&*<>\.,/\\\|'`:\~\?]*)"
;; #"^([^0-9\[\]\(\)\{\};#\s\"][^\[\]\(\)\{\};#\s\"]*)"
)
;; [Lexers]
(def ^:private lex-white-space
(|do [[meta white-space] (&reader/read-regex #"^(\s+)")]
(return (&/V "lux;Meta" (&/T meta (&/V "White_Space" white-space))))))
(def ^:private lex-single-line-comment
(|do [_ (&reader/read-text "##")
[meta comment] (&reader/read-regex #"^(.*)$")]
(return (&/V "lux;Meta" (&/T meta (&/V "Comment" comment))))))
(defn ^:private lex-multi-line-comment [_]
(|do [_ (&reader/read-text "#(")
[meta comment] (&/try-all% (&/|list (|do [[meta comment] (&reader/read-regex #"(?is)^(?!#\()(.*?(?=\)#))")
;; :let [_ (prn 'immediate comment)]
_ (&reader/read-text ")#")]
(return (&/T meta comment)))
(|do [;; :let [_ (prn 'pre/_0)]
[meta pre] (&reader/read-regex+ #"(?is)^(.*?)(#\(|$)")
;; :let [_ (prn 'pre pre)]
[_ inner] (lex-multi-line-comment nil)
;; :let [_ (prn 'inner inner)]
[_ post] (&reader/read-regex #"(?is)^(.+?(?=\)#))")
;; :let [_ (prn 'post post (str pre "#(" inner ")#" post))]
]
(return (&/T meta (str pre "#(" inner ")#" post))))))
;; :let [_ (prn 'lex-multi-line-comment (str comment ")#"))]
_ (&reader/read-text ")#")]
(return (&/V "lux;Meta" (&/T meta (&/V "Comment" comment))))))
(def ^:private lex-comment
(&/try-all% (&/|list lex-single-line-comment
(lex-multi-line-comment nil))))
(do-template [<name> <tag> <regex>]
(def <name>
(|do [[meta token] (&reader/read-regex <regex>)]
(return (&/V "lux;Meta" (&/T meta (&/V <tag> token))))))
^:private lex-bool "Bool" #"^(true|false)"
^:private lex-int "Int" #"^-?(0|[1-9][0-9]*)"
^:private lex-real "Real" #"^-?(0|[1-9][0-9]*)\.[0-9]+"
)
(def ^:private lex-char
(|do [[meta _] (&reader/read-text "#\"")
token (&/try-all% (&/|list (|do [[_ escaped] (&reader/read-regex #"^(\\.)")]
(escape-char escaped))
(|do [[_ char] (&reader/read-regex #"^(.)")]
(return char))))
_ (&reader/read-text "\"")]
(return (&/V "lux;Meta" (&/T meta (&/V "Char" token))))))
(def ^:private lex-text
(|do [[meta _] (&reader/read-text "\"")
token (lex-text-body nil)
_ (&reader/read-text "\"")]
(return (&/V "lux;Meta" (&/T meta (&/V "Text" token))))))
(def ^:private lex-ident
(&/try-all% (&/|list (|do [[meta token] (&reader/read-regex +ident-re+)]
(&/try-all% (&/|list (|do [_ (&reader/read-text ";")
[_ local-token] (&reader/read-regex +ident-re+)]
(&/try-all% (&/|list (|do [unaliased (&module/dealias token)]
(return (&/T meta (&/T unaliased local-token))))
(|do [? (&module/exists? token)]
(if ?
(return (&/T meta (&/T token local-token)))
(fail (str "[Lexer Error] Unknown module: " token))))
)))
(return (&/T meta (&/T "" token)))
)))
(|do [[meta _] (&reader/read-text ";;")
[_ token] (&reader/read-regex +ident-re+)
module-name &/get-module-name]
(return (&/T meta (&/T module-name token))))
(|do [[meta _] (&reader/read-text ";")
[_ token] (&reader/read-regex +ident-re+)]
(return (&/T meta (&/T "lux" token))))
)))
(def ^:private lex-symbol
(|do [[meta ident] lex-ident]
(return (&/V "lux;Meta" (&/T meta (&/V "Symbol" ident))))))
(def ^:private lex-tag
(|do [[meta _] (&reader/read-text "#")
[_ ident] lex-ident]
(return (&/V "lux;Meta" (&/T meta (&/V "Tag" ident))))))
(do-template [<name> <text> <tag>]
(def <name>
(|do [[meta _] (&reader/read-text <text>)]
(return (&/V "lux;Meta" (&/T meta (&/V <tag> nil))))))
^:private lex-open-paren "(" "Open_Paren"
^:private lex-close-paren ")" "Close_Paren"
^:private lex-open-bracket "[" "Open_Bracket"
^:private lex-close-bracket "]" "Close_Bracket"
^:private lex-open-brace "{" "Open_Brace"
^:private lex-close-brace "}" "Close_Brace"
)
(def ^:private lex-delimiter
(&/try-all% (&/|list lex-open-paren
lex-close-paren
lex-open-bracket
lex-close-bracket
lex-open-brace
lex-close-brace)))
;; [Exports]
(def lex
(&/try-all% (&/|list lex-white-space
lex-comment
lex-bool
lex-real
lex-int
lex-char
lex-text
lex-symbol
lex-tag
lex-delimiter)))
|
