mirror of
https://github.com/kanaka/mal.git
synced 2024-09-20 10:07:45 +03:00
72 lines
2.3 KiB
Plaintext
72 lines
2.3 KiB
Plaintext
(de load-relative (Path)
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(load (pack (car (file)) Path)) )
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(load-relative "readline.l")
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(load-relative "types.l")
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(load-relative "reader.l")
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(load-relative "printer.l")
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(load-relative "env.l")
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(de READ (String)
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(read-str String) )
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(def '*ReplEnv (MAL-env NIL))
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(set> *ReplEnv '+ '((A B) (MAL-number (+ (MAL-value A) (MAL-value B)))))
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(set> *ReplEnv '- '((A B) (MAL-number (- (MAL-value A) (MAL-value B)))))
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(set> *ReplEnv '* '((A B) (MAL-number (* (MAL-value A) (MAL-value B)))))
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(set> *ReplEnv '/ '((A B) (MAL-number (/ (MAL-value A) (MAL-value B)))))
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(de EVAL (Ast Env)
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(if (= (MAL-type Ast) 'list)
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(if (not (MAL-value Ast))
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Ast
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(let (Ast* (MAL-value Ast)
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A0* (MAL-value (car Ast*))
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A1* (MAL-value (cadr Ast*))
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A2 (caddr Ast*))
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(cond
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((= A0* 'def!)
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(set> Env A1* (EVAL A2 Env)) )
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((= A0* 'let*)
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(let Env* (MAL-env Env)
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(for (Bindings A1* Bindings)
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(let (Key (MAL-value (pop 'Bindings))
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Value (EVAL (pop 'Bindings) Env*))
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(set> Env* Key Value) ) )
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(EVAL A2 Env*) ) )
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(T (let Value (MAL-value (eval-ast Ast Env))
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(apply (car Value) (cdr Value)) ) ) ) ) )
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(eval-ast Ast Env) ) )
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(de eval-ast (Ast Env)
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(let Value (MAL-value Ast)
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(case (MAL-type Ast)
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(symbol (get> Env Value))
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(list (MAL-list (mapcar '((Form) (EVAL Form Env)) Value)))
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(vector (MAL-vector (mapcar '((Form) (EVAL Form Env)) Value)))
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(map (MAL-map (mapcar '((Form) (EVAL Form Env)) Value)))
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(T Ast) ) ) )
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(de PRINT (Ast)
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(pr-str Ast T) )
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(de rep (String)
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(PRINT (EVAL (READ String) *ReplEnv)) )
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(load-history ".mal_history")
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(use Eof
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(until Eof
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(let Input (readline "user> ")
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(if (=0 Input)
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(setq Eof T)
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(let Output (catch 'err (rep Input))
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(if (isa '+MALError Output)
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(let Message (MAL-value Output)
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(unless (= (MAL-value Message) "end of token stream")
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(prinl "[error] " (pr-str Message)) ) )
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(prinl Output) ) ) ) ) ) )
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(prinl)
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(bye)
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