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https://github.com/kanaka/mal.git
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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.
55 lines
1.4 KiB
Plaintext
55 lines
1.4 KiB
Plaintext
load "../logo/types.lg
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to pr_str :exp :readable
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if emptyp :exp [output []]
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output case obj_type :exp [
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[[nil] "nil]
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[[true] "true]
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[[false] "false]
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[[number] obj_val :exp]
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[[symbol] obj_val :exp]
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[[keyword] word ": obj_val :exp]
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[[string] print_string :exp :readable]
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[[list] pr_seq obj_val :exp :readable "\( "\) :space_char]
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[[vector] pr_seq obj_val :exp :readable "\[ "\] :space_char]
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[[hashmap] pr_seq obj_val :exp :readable "\{ "\} :space_char]
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[[atom] (word "\(atom :space_char pr_str obj_val :exp :readable "\) ) ]
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[[nativefn] (word "#<NativeFunction: obj_val :exp ">) ]
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[[fn] (word "#<Function:args= pr_str fn_args :exp :readable ", :space_char "macro= fn_is_macro :exp ">) ]
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[else (throw "error (sentence [unknown type] obj_type :exp))]
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]
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end
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to escape_string :s
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localmake "i 1
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localmake "res "
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while [:i <= count :s] [
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localmake "c item :i :s
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make "res word :res cond [
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[[ :c = "\\ ] "\\\\ ]
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[[ :c = char 10 ] "\\n ]
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[[ :c = "\" ] "\\\" ]
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[else :c ]
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]
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make "i (:i + 1)
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]
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output :res
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end
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to print_string :exp :readable
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ifelse :readable [
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output (word "\" escape_string obj_val :exp "\" )
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] [
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output obj_val :exp
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]
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end
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to pr_seq :seq :readable :start_char :end_char :delim_char
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localmake "res :start_char
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foreach :seq [
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if # > 1 [make "res word :res :delim_char]
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make "res word :res pr_str ? :readable
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]
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output word :res :end_char
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end
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