mirror of
https://github.com/kanaka/mal.git
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123 lines
4.3 KiB
Plaintext
123 lines
4.3 KiB
Plaintext
(class +Reader)
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# tokens
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(dm T (Tokens)
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(=: tokens Tokens) )
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(dm next> ()
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(pop (:: tokens)) )
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(dm peek> ()
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(car (: tokens)) )
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(de read-str (String)
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(let (Tokens (tokenizer String)
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Reader (new '(+Reader) Tokens) )
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(read-form Reader) ) )
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(de tokenizer (String)
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# [\s,]*(~@|[\[\]{}()'`~^@]|"(?:\\.|[^\\"])*"|;.*|[^\s\[\]{}('"`,;)]*)
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(let (Special " []{}()'\"`,;" )
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(make
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(for (Chars (chop String) Chars)
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(let Char (pop 'Chars)
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(cond
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((member Char '(" " ","))
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# do nothing, whitespace
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)
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((and (= Char "~") (= (car Chars) "@"))
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(link "~@")
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(pop 'Chars) ) # remove @ token
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((index Char (chop "[]{}()'`~^\@"))
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(link Char) )
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((= Char "\"")
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(link
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(pack
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(make
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(link Char)
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(let (Char (car Chars) Done NIL)
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(while (and (not Done) Chars)
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(link (pop 'Chars))
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(cond
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((= Char "\\")
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(link (pop 'Chars)) # add char after \
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(setq Char (car Chars)) )
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((<> Char "\"")
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(setq Char (car Chars)) )
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((= Char "\"")
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(setq Done T) ) ) ) ) ) ) ) )
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((= Char ";")
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(while (and Chars (<> Char "\n"))
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(setq Char (pop 'Chars)) ) )
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((not (index Char (chop Special)))
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(link
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(pack
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(make
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(link Char)
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(let Char (car Chars)
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(while (and Chars (not (index Char (chop Special))))
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(link (pop 'Chars))
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(setq Char (car Chars)) ) ) ) ) ) ) ) ) ) ) ) )
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(de read-form (Reader)
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(case (peek> Reader)
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("'" (read-macro Reader 'quote))
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("`" (read-macro Reader 'quasiquote))
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("~" (read-macro Reader 'unquote))
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("~@" (read-macro Reader 'splice-unquote))
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("@" (read-macro Reader 'deref))
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("\^" (read-meta Reader))
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("(" (read-list Reader 'list ")"))
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("[" (read-list Reader 'vector "]"))
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("{" (read-list Reader 'map "}"))
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(T (read-atom Reader)) ) )
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(de read-macro (Reader symbol)
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(next> Reader) # pop reader macro token
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(MAL-list (list (MAL-symbol symbol) (read-form Reader))) )
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(de read-meta (Reader)
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(next> Reader) # pop reader macro token
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(let Form (read-form Reader)
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(MAL-list (list (MAL-symbol 'with-meta) (read-form Reader) Form) ) ) )
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(de read-list (Reader Type Ender)
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(next> Reader) # pop list start
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(new (list (case Type
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(list '+MALList)
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(vector '+MALVector)
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(map '+MALMap) ) )
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(make
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(use Done
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(while (not Done)
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(let Token (peek> Reader)
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(cond
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((= Token Ender)
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(next> Reader) # pop list end
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(setq Done T) )
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((not Token)
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(let Msg (pack "expected '" Ender "', got EOF")
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(throw 'err (MAL-error Msg)) ) )
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(T (link (read-form Reader))) ) ) ) ) ) ) )
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(de read-atom (Reader)
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(let (Token (next> Reader)
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Chars (chop Token))
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(cond
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((= Token "true")
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*MAL-true)
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((= Token "false")
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*MAL-false)
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((= Token "nil")
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*MAL-nil)
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((format Token)
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(MAL-number @) )
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((= (car Chars) "\"")
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(if (= (last Chars) "\"")
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(MAL-string (any Token))
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(throw 'err (MAL-error "expected '\"', got EOF")) ) )
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((= (car Chars) ":")
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(MAL-keyword (intern (pack (cdr Chars)))) )
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((not Token)
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(throw 'err (MAL-error "end of token stream")) )
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(T (MAL-symbol (intern Token))) ) ) )
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