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|
(;module:
lux
(lux (control monad)
(data [bool]
[char]
[text]
[number]
(text ["l" lexer #+ Lexer Monad<Lexer> "l/" Monad<Lexer>]
format)
[product]
(coll [list "L/" Functor<List> Fold<List>]
["V" vector]))))
(def: (space^ where)
(-> Cursor (Lexer [Text Cursor]))
(do Monad<Lexer>
[head (l;some' (l;one-of "\t\v \r\f"))]
(l;either (l;after (l;one-of "\n")
(do @
[[tail end] (space^ (|> where
(update@ #;line n.inc)
(set@ #;column +0)))]
(wrap [(format head tail)
end])))
(wrap [head
(|> where
(update@ #;column (n.+ (text;size head))))]))))
(def: (single-line-comment^ where)
(-> Cursor (Lexer [Text Cursor]))
(l;enclosed ["##" "\n"]
(do Monad<Lexer>
[comment (l;some' (l;none-of "\n"))]
(wrap [comment
(|> where
(update@ #;line n.inc)
(set@ #;column +0))]))))
(def: comment-bound^
(Lexer Text)
($_ l;either
(l;text "\n")
(l;text ")#")
(l;text "#(")))
(def: (multi-line-comment^ where)
(-> Cursor (Lexer [Text Cursor]))
(do Monad<Lexer>
[_ (l;text "#(")
[comment end] (loop [comment ""
where (|> where
(update@ #;column (n.+ +2)))]
($_ l;either
(do @
[_ (l;one-of "\n")]
(recur (format comment "\n")
(|> where
(update@ #;line n.inc)
(set@ #;column +0))))
(do @
[chunk (l;some' (l;not comment-bound^))]
(recur (format comment chunk)
(|> where
(update@ #;column (n.+ (text;size chunk))))))
(do @
[[sub-comment sub-where] (multi-line-comment^ where)]
(wrap [(format comment "#(" sub-comment ")#")
sub-where]))))
_ (l;text ")#")]
(wrap [comment
(|> end
(update@ #;column (n.+ +2)))])))
(def: (comment^ where)
(-> Cursor (Lexer [Text Cursor]))
(l;either (single-line-comment^ where)
(multi-line-comment^ where)))
(def: (padding^ where)
(-> Cursor (Lexer Cursor))
(l;either (do Monad<Lexer>
[[comment where] (comment^ where)]
(padding^ where))
(do Monad<Lexer>
[[white-space where] (space^ where)]
(wrap where))
))
(def: escaped-char^
(Lexer [Text Char])
(l;after (l;char #"\\")
(do Monad<Lexer>
[code l;any]
(case code
#"t" (wrap ["\\t" #"\t"])
#"v" (wrap ["\\v" #"\v"])
#"b" (wrap ["\\b" #"\b"])
#"n" (wrap ["\\n" #"\n"])
#"r" (wrap ["\\r" #"\r"])
#"f" (wrap ["\\f" #"\f"])
#"\"" (wrap ["\\\"" #"\""])
#"\\" (wrap ["\\\\" #"\\"])
#"u"
(do Monad<Lexer>
[code (l;between' +1 +4 l;hex-digit)]
(wrap (case (:: number;Hex@Codec<Text,Nat> decode
(format "+" code))
(#;Right value)
[(format "\\u" code) (char;char value)]
_
(undefined))))
_
(l;fail (format "Invalid escaping syntax: " (%c code)))))))
(def: raw-char^
(Lexer [Text Char])
(l;either (do Monad<Lexer>
[char (l;none-of "\\\"\n")]
(wrap [(char;as-text char) char]))
escaped-char^))
(do-template [<name> <tag> <lexer> <codec>]
[(def: (<name> where)
(-> Cursor (Lexer [AST Cursor]))
(do Monad<Lexer>
[chunk <lexer>]
(case (:: <codec> decode chunk)
(#;Left error)
(l;fail error)
(#;Right value)
(wrap [[where (<tag> value)]
(|> where
(update@ #;column (n.+ (text;size chunk))))]))))]
[bool^ #;BoolS
(l;either (l;text "true") (l;text "false"))
bool;Codec<Text,Bool>]
[nat^ #;NatS
(l;seq' (l;text "+") (l;many' l;digit))
number;Codec<Text,Nat>]
[int^ #;IntS
(l;seq' (l;default "" (l;text "-"))
(l;many' l;digit))
number;Codec<Text,Int>]
[real^ #;RealS
($_ l;seq'
(l;default "" (l;text "-"))
(l;many' l;digit)
(l;text ".")
(l;many' l;digit))
number;Codec<Text,Real>]
[deg^ #;DegS
(l;seq' (l;text ".")
(l;many' l;digit))
number;Codec<Text,Deg>]
)
(def: (char^ where)
(-> Cursor (Lexer [AST Cursor]))
(do Monad<Lexer>
[[chunk value] (l;enclosed ["#\"" "\""]
raw-char^)]
(wrap [[where (#;CharS value)]
(|> where
(update@ #;column (|>. ($_ n.+ +3 (text;size chunk)))))])))
(def: (text^ where)
(-> Cursor (Lexer [AST Cursor]))
(do Monad<Lexer>
[_ (l;text "\"")
#let [offset-column (n.inc (get@ #;column where))]
[text-read where'] (: (Lexer [Text Cursor])
(loop [text-read ""
where (|> where
(update@ #;column n.inc))
next-line-start? false]
(let [next-line (do @
[_ (l;text "\n")]
(recur (format text-read "\n")
(|> where
(update@ #;line n.inc)
(set@ #;column +0))
true))]
(if next-line-start?
(l;either next-line
(do @
[offset (l;many' (l;char #" "))
#let [offset-size (text;size offset)]]
(if (n.>= offset-column offset-size)
(recur (|> offset
(text;split offset-column)
(default (undefined))
product;right
(format text-read))
(|> where
(update@ #;column (n.+ offset-size)))
false)
(l;fail (format "Each line of a multi-line text must have an appropriate offset!\n"
"Expected: " (%i (nat-to-int offset-column)) " columns.\n"
" Actual: " (%i (nat-to-int offset-size)) " columns.\n")))))
($_ l;either
(do @
[normal (l;many' (l;none-of "\\\"\n"))]
(recur (format text-read normal)
(|> where
(update@ #;column (n.+ (text;size normal))))
false))
(do @
[[chunk char] escaped-char^]
(recur (format text-read (char;as-text char))
(|> where
(update@ #;column (n.+ (text;size chunk))))
false))
next-line
(do @
[_ (l;text "\"")]
(wrap [text-read
(|> where
(update@ #;column n.inc))])))))))]
(wrap [[where (#;TextS text-read)]
where'])))
(do-template [<name> <tag> <open> <close>]
[(def: (<name> where ast^)
(-> Cursor
(-> Cursor (Lexer [AST Cursor]))
(Lexer [AST Cursor]))
(do Monad<Lexer>
[_ (l;text <open>)
[elems where'] (loop [elems (: (V;Vector AST)
V;empty)
where where]
(l;either (do @
[[elem where'] (ast^ where)]
(recur (V;add elem elems)
where'))
(do @
[where' (padding^ where)
_ (l;text <close>)]
(wrap [(V;to-list elems)
(|> where'
(update@ #;column n.inc))]))))]
(wrap [[where (<tag> elems)]
where'])))]
[form^ #;FormS "(" ")"]
[tuple^ #;TupleS "[" "]"]
)
(def: (record^ where ast^)
(-> Cursor
(-> Cursor (Lexer [AST Cursor]))
(Lexer [AST Cursor]))
(do Monad<Lexer>
[_ (l;text "{")
[elems where'] (loop [elems (: (V;Vector [AST AST])
V;empty)
where where]
(l;either (do @
[[key where] (ast^ where)
[val where'] (ast^ where)]
(recur (V;add [key val] elems)
where'))
(do @
[where' (padding^ where)
_ (l;text "}")]
(wrap [(V;to-list elems)
(|> where'
(update@ #;column n.inc))]))))]
(wrap [[where (#;RecordS elems)]
where'])))
(def: ident-part^
(Lexer Text)
(do Monad<Lexer>
[#let [digits "0123456789"
delimiters "()[]{}#;\""
space "\t\v \n\r\f"
head-lexer (l;none-of (format digits delimiters space))
tail-lexer (l;some' (l;none-of (format delimiters space)))]
head head-lexer
tail tail-lexer]
(wrap (format (char;as-text head)
tail))))
(def: ident^
(Lexer [Ident Nat])
($_ l;either
(do Monad<Lexer>
[_ (l;text ";;")
def-name ident-part^]
(l;fail "Cannot handle ;; syntax for identifiers."))
(do Monad<Lexer>
[_ (l;text ";")
def-name ident-part^]
(wrap [["lux" def-name]
(n.inc (text;size def-name))]))
(do Monad<Lexer>
[first-part ident-part^]
(l;either (do @
[_ (l;char #";")
second-part ident-part^]
(wrap [[first-part second-part]
($_ n.+
(text;size first-part)
+1
(text;size second-part))]))
(wrap [["" first-part]
(text;size first-part)])))))
(do-template [<name> <tag> <lexer> <extra>]
[(def: (<name> where)
(-> Cursor (Lexer [AST Cursor]))
(do Monad<Lexer>
[[value length] <lexer>]
(wrap [[where (<tag> value)]
(|> where
(update@ #;column (|>. ($_ n.+ <extra> length))))])))]
[symbol^ #;SymbolS ident^ +0]
[tag^ #;TagS (l;after (l;char #"#") ident^) +1]
)
(def: #export (ast^ where)
(-> Cursor (Lexer [AST Cursor]))
(do Monad<Lexer>
[where (padding^ where)]
($_ l;either
(form^ where ast^)
(tuple^ where ast^)
(record^ where ast^)
(bool^ where)
(nat^ where)
(real^ where)
(int^ where)
(deg^ where)
(symbol^ where)
(tag^ where)
(char^ where)
(text^ where)
)))
|
