mirror of
https://github.com/kanaka/mal.git
synced 2024-11-11 00:52:44 +03:00
4eb88ef295
Tested on UCBLogo 6.0 with some minor tweaks (for performance and adding a `timems` function). The tweaks are performed during Docker image creation (see Dockerfile). Tests of step 5 are skipped because UCBLogo is too slow. Interop is available via `(logo-eval "logo code to run")`. The `examples` directory contains a Mal example of drawing a tree using turtle graphics.
97 lines
2.1 KiB
Plaintext
97 lines
2.1 KiB
Plaintext
load "../logo/readline.lg
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load "../logo/reader.lg
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load "../logo/printer.lg
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load "../logo/types.lg
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load "../logo/env.lg
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to _read :str
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output read_str :str
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end
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to eval_ast :ast :env
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output case (obj_type :ast) [
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[[symbol] env_get :env :ast]
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[[list] obj_new "list map [_eval ? :env] obj_val :ast]
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[[vector] obj_new "vector map [_eval ? :env] obj_val :ast]
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[[hashmap] obj_new "hashmap map [_eval ? :env] obj_val :ast]
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[else :ast]
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]
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end
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to _eval :ast :env
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if (obj_type :ast) <> "list [output eval_ast :ast :env]
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if emptyp obj_val :ast [output :ast]
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localmake "a0 nth :ast 0
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case list obj_type :a0 obj_val :a0 [
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[[[symbol def!]]
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localmake "a1 nth :ast 1
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localmake "a2 nth :ast 2
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output env_set :env :a1 _eval :a2 :env ]
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[[[symbol let*]]
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localmake "a1 nth :ast 1
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localmake "letenv env_new :env [] []
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localmake "i 0
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while [:i < _count :a1] [
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ignore env_set :letenv nth :a1 :i _eval nth :a1 (:i + 1) :letenv
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make "i (:i + 2)
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]
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output _eval nth :ast 2 :letenv ]
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[else
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make "el obj_val eval_ast :ast :env
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output apply first :el butfirst :el ]
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]
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end
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to _print :exp
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output pr_str :exp "true
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end
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to rep :str
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output _print _eval _read :str :repl_env
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end
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to mal_add :a :b
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output obj_new "number ((obj_val :a) + (obj_val :b))
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end
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to mal_sub :a :b
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output obj_new "number ((obj_val :a) - (obj_val :b))
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end
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to mal_mul :a :b
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output obj_new "number ((obj_val :a) * (obj_val :b))
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end
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to mal_div :a :b
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output obj_new "number ((obj_val :a) / (obj_val :b))
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end
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to repl
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localmake "running "true
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while [:running] [
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localmake "line readline word "user> :space_char
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ifelse :line=[] [
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print "
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make "running "false
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] [
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if not emptyp :line [
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catch "error [print rep :line]
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localmake "exception error
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if not emptyp :exception [
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(print "Error: first butfirst :exception)
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]
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]
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]
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]
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end
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make "repl_env env_new [] [] []
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ignore env_set :repl_env obj_new "symbol "+ "mal_add
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ignore env_set :repl_env obj_new "symbol "- "mal_sub
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ignore env_set :repl_env obj_new "symbol "* "mal_mul
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ignore env_set :repl_env obj_new "symbol "/ "mal_div
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repl
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bye
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