mirror of
https://github.com/kanaka/mal.git
synced 2024-09-19 09:38:28 +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.
79 lines
1.8 KiB
Plaintext
79 lines
1.8 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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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] localmake "val hashmap_get :env :ast
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if emptyp :val [(throw "error sentence (word "' obj_val :ast "' ) [not found])]
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:val ]
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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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make "el obj_val eval_ast :ast :env
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output apply first :el butfirst :el
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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 []
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make "repl_env hashmap_put :repl_env symbol_new "+ "mal_add
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make "repl_env hashmap_put :repl_env symbol_new "- "mal_sub
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make "repl_env hashmap_put :repl_env symbol_new "* "mal_mul
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make "repl_env hashmap_put :repl_env symbol_new "/ "mal_div
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repl
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bye
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