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|
(ns lux.lexer
(:require (clojure [template :refer [do-template]]
[string :as string])
(lux [base :as & :refer [defvariant |do return* return |case]]
[reader :as &reader])
[lux.analyser.module :as &module]))
;; [Tags]
(defvariant
("White_Space" 1)
("Comment" 1)
("Bit" 1)
("Nat" 1)
("Int" 1)
("Rev" 1)
("Frac" 1)
("Text" 1)
("Identifier" 1)
("Tag" 1)
("Open_Paren" 0)
("Close_Paren" 0)
("Open_Bracket" 0)
("Close_Bracket" 0)
("Open_Brace" 0)
("Close_Brace" 0)
)
;; [Utils]
(defn- clean-line
"(-> Text Text)"
[^String raw-line]
(let [line-length (.length raw-line)
buffer (new StringBuffer line-length)]
(loop [idx 0]
(if (< idx line-length)
(let [current-char (.charAt raw-line idx)]
(if (= \\ current-char)
(do (assert (< (+ 1 idx) line-length) (str "[Lexer Error] Text is too short for escaping: " raw-line " " idx))
(case (.charAt raw-line (+ 1 idx))
\t (do (.append buffer "\t")
(recur (+ 2 idx)))
\v (do (.append buffer "\u000B")
(recur (+ 2 idx)))
\b (do (.append buffer "\b")
(recur (+ 2 idx)))
\n (do (.append buffer "\n")
(recur (+ 2 idx)))
\r (do (.append buffer "\r")
(recur (+ 2 idx)))
\f (do (.append buffer "\f")
(recur (+ 2 idx)))
\" (do (.append buffer "\"")
(recur (+ 2 idx)))
\\ (do (.append buffer "\\")
(recur (+ 2 idx)))
\u (do (assert (< (+ 5 idx) line-length) (str "[Lexer Error] Text is too short for unicode-escaping: " raw-line " " idx))
(.append buffer (char (Integer/valueOf (.substring raw-line (+ 2 idx) (+ 6 idx)) 16)))
(recur (+ 6 idx)))
;; else
(assert false (str "[Lexer Error] Invalid escaping syntax: " raw-line " " idx))))
(do (.append buffer current-char)
(recur (+ 1 idx)))))
(.toString buffer)))))
(defn- lex-text-body [multi-line? offset]
(|do [[_ eol? ^String pre-quotes**] (&reader/read-regex #"^([^\"]*)")
^String pre-quotes* (if multi-line?
(|do [:let [empty-line? (and eol? (= "" pre-quotes**))]
_ (&/assert! (or empty-line?
(>= (.length pre-quotes**) offset))
"Each line of a multi-line text must have an appropriate offset!")]
(return (if empty-line?
"\n"
(str "\n" (.substring pre-quotes** offset)))))
(return pre-quotes**))
[pre-quotes post-quotes] (if (.endsWith pre-quotes* "\\")
(if eol?
(&/fail-with-loc "[Lexer Error] Cannot leave dangling back-slash \\")
(if (if-let [^String back-slashes (re-find #"\\+$" pre-quotes*)]
(odd? (.length back-slashes)))
(|do [[_ eol?* _] (&reader/read-regex #"^([\"])")
next-part (lex-text-body eol?* offset)]
(return (&/T [(.substring pre-quotes* 0 (dec (.length pre-quotes*)))
(str "\"" next-part)])))
(|do [post-quotes* (lex-text-body false offset)]
(return (&/T [pre-quotes* post-quotes*])))))
(if eol?
(|do [next-part (lex-text-body true offset)]
(return (&/T [pre-quotes*
next-part])))
(return (&/T [pre-quotes* ""]))))]
(return (str (clean-line pre-quotes) post-quotes))))
(def lex-text
(|do [[meta _ _] (&reader/read-text "\"")
:let [[_ _ _column] meta]
token (lex-text-body false (inc _column))
_ (&reader/read-text "\"")]
(return (&/T [meta ($Text token)]))))
(def +ident-re+
#"^([^0-9\[\]\{\}\(\)\s\"#.][^\[\]\{\}\(\)\s\"#.]*)")
;; [Lexers]
(def ^:private lex-white-space
(|do [[meta _ white-space] (&reader/read-regex #"^(\s+|$)")]
(return (&/T [meta ($White_Space white-space)]))))
(def ^:private lex-comment
(|do [_ (&reader/read-text "##")
[meta _ comment] (&reader/read-regex #"^(.*)$")]
(return (&/T [meta ($Comment comment)]))))
(do-template [<name> <tag> <regex>]
(def <name>
(|do [[meta _ token] (&reader/read-regex <regex>)]
(return (&/T [meta (<tag> token)]))))
lex-bit $Bit #"^#(0|1)"
)
(do-template [<name> <tag> <regex>]
(def <name>
(|do [[meta _ token] (&reader/read-regex <regex>)]
(return (&/T [meta (<tag> (string/replace token #"_" ""))]))))
lex-nat $Nat #"^[0-9][0-9_]*"
lex-int $Int #"^(-|\+)[0-9][0-9_]*"
lex-rev $Rev #"^\.[0-9][0-9_]*"
lex-frac $Frac #"^(-|\+)[0-9][0-9_]*\.[0-9][0-9_]*((e|E)(-|\+)[0-9][0-9_]*)?"
)
(def +same-module-mark+ (str &/+name-separator+ &/+name-separator+))
(def ^:private lex-ident
(&/try-all-% "[Reader Error]"
(&/|list (|do [[meta _ token] (&reader/read-regex +ident-re+)
[_ _ got-it?] (&reader/read-text? &/+name-separator+)]
(|case got-it?
(&/$Some _)
(|do [[_ _ local-token] (&reader/read-regex +ident-re+)
? (&module/exists? token)]
(if ?
(return (&/T [meta (&/T [token local-token])]))
(|do [unaliased (&module/dealias token)]
(return (&/T [meta (&/T [unaliased local-token])])))))
(&/$None)
(return (&/T [meta (&/T ["" token])]))))
(|do [[meta _ _] (&reader/read-text +same-module-mark+)
[_ _ token] (&reader/read-regex +ident-re+)
module-name &/get-module-name]
(return (&/T [meta (&/T [module-name token])])))
(|do [[meta _ _] (&reader/read-text &/+name-separator+)
[_ _ token] (&reader/read-regex +ident-re+)]
(return (&/T [meta (&/T ["lux" token])])))
)))
(def ^:private lex-identifier
(|do [[meta ident] lex-ident]
(return (&/T [meta ($Identifier ident)]))))
(def ^:private lex-tag
(|do [[meta _ _] (&reader/read-text "#")
[_ ident] lex-ident]
(return (&/T [meta ($Tag ident)]))))
(do-template [<name> <text> <tag>]
(def <name>
(|do [[meta _ _] (&reader/read-text <text>)]
(return (&/T [meta <tag>]))))
^: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-% "[Reader Error]"
(&/|list lex-white-space
lex-comment
lex-bit
lex-nat
lex-frac
lex-rev
lex-int
lex-text
lex-identifier
lex-tag
lex-delimiter)))
|
