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;; Copyright (c) Eduardo Julian. All rights reserved.
;; This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
;; If a copy of the MPL was not distributed with this file,
;; You can obtain one at http://mozilla.org/MPL/2.0/.
(ns lux.lexer
(:require [clojure.template :refer [do-template]]
(lux [base :as & :refer [deftags |do return* return fail fail*]]
[reader :as &reader])
[lux.analyser.module :as &module]))
;; [Tags]
(deftags ""
"White_Space"
"Comment"
"Bool"
"Int"
"Real"
"Char"
"Text"
"Symbol"
"Tag"
"Open_Paren"
"Close_Paren"
"Open_Bracket"
"Close_Bracket"
"Open_Brace"
"Close_Brace"
)
;; [Utils]
(defn ^:private escape-char [escaped]
(cond (.equals ^Object escaped "\\t") (return "\t")
(.equals ^Object escaped "\\b") (return "\b")
(.equals ^Object escaped "\\n") (return "\n")
(.equals ^Object escaped "\\r") (return "\r")
(.equals ^Object escaped "\\f") (return "\f")
(.equals ^Object escaped "\\\"") (return "\"")
(.equals ^Object escaped "\\\\") (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 (&/T meta (&/V $White_Space white-space)))))
(def ^:private lex-single-line-comment
(|do [_ (&reader/read-text "##")
[meta comment] (&reader/read-regex #"^(.*)$")]
(return (&/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)^(?!#\()((?!\)#).)*")]
(return (&/T meta comment)))
(|do [[meta pre] (&reader/read-regex+ #"(?is)^((?!#\().)*")
[_ ($Comment inner)] (lex-multi-line-comment nil)
[_ post] (&reader/read-regex+ #"(?is)^((?!\)#).)*")]
(return (&/T meta (str pre "#(" inner ")#" post))))))
_ (&reader/read-text ")#")]
(return (&/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 (&/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\.[0-9]+|[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 (&/T meta (&/V $Char token)))))
(def ^:private lex-text
(|do [[meta _] (&reader/read-text "\"")
token (lex-text-body nil)
_ (&reader/read-text "\"")]
(return (&/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+)
? (&module/exists? token)]
(if ?
(return (&/T meta (&/T token local-token)))
(|do [unaliased (do ;; (prn "Unaliasing: " token ";" local-token)
(&module/dealias token))]
(do ;; (prn "Unaliased: " unaliased ";" local-token)
(return (&/T meta (&/T unaliased local-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 (&/T meta (&/V $Symbol ident)))))
(def ^:private lex-tag
(|do [[meta _] (&reader/read-text "#")
[_ ident] lex-ident]
(return (&/T meta (&/V $Tag ident)))))
(do-template [<name> <text> <tag>]
(def <name>
(|do [[meta _] (&reader/read-text <text>)]
(return (&/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)))
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