435 lines
32 KiB
Plaintext
435 lines
32 KiB
Plaintext
(with_import "./collections.kp"
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(let (
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; For right now we only support calling partial_eval in such a way that it partial evals against
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; the root env, but this is could and really should be extended. We could at least check if the env we're called with
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; is the root_env, or if what we look up in whatever env is passed in matches something in the root env
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; Care should also be taken when evaluating outside combinators to have them be in the right env, etc
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; Here is every form in k'
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; True
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; False
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; Env: *KPEnv
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; Combiner: KPCombiner / BuiltinCombiner: KPBuiltinCombiner
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; String: str
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; Symbol: str
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; Int: int
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; Array: rc<vec<KPValue>>
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; Nil
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; Ok, some more things we need / need to change
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; 1) meta...
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; Honestly, I'm tempted to get rid of it
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; !!!!!!!!!!!!!!!!!!!!!!!!!!
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; ! To avoid exponential blowup due to evaluating function, then params, then function with params, etc etc
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; ! Should probabally implement some form of evaluating to head-normal form controlled by boolean
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; ! that quits as soon as it has any sort of value (I suppose the real change is only to combinators and arrays)
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; ! so that we don't waste time re-trying etc. Anything in parameter position would be fully evaluated, so I don't think
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; ! we'd waste overmuch, but it could make things less efficient I suppose...
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; ! Maybe it's a bad idea - food for thought! Might need a better cacheing strategy
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; !!!!!!!!!!!!!!!!!!!!!!!!!
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; Possible marked values
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; ['val v] - v is a value that evaluates to itself, and not a combiner or env, as those have their own metadata. Not an array or symbol
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; That means it's true/false/a string/ an int/nil
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; ['marked_array is_val a] - a contains marked values. if is_val, then it's the value version, and must be stripped back into (array ...),
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; otherwise it's a calling form, and should be lowered back to (...). Also, if it's is_val, partial_eval won't perform a call, etc
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; ['marked_symbol is_val s] - a symbol. is_val has the same meaning as in marked_array
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; ['comb wrap_level de? se variadic params body <actual_function>] - A combiner. Contains the static env and the actual function, if possible.
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; It is possible to have a combiner without an actual function, but that's only generated when
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; we know it's about to be called and we won't have to strip-lower it
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; ['prim_comb <handler_function> <actual_function>] - A primitive combiner! It has it's own special handler function to partial eval
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; ['env [ ['symbol marked_value ]... <upper_marked_env> ] <actual_env>] - A marked env
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val? (lambda (x) (= 'val (idx x 0)))
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.val (lambda (x) (idx x 1))
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marked_array? (lambda (x) (= 'marked_array (idx x 0)))
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.marked_array_is_val (lambda (x) (idx x 1))
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.marked_array_values (lambda (x) (idx x 2))
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marked_symbol? (lambda (x) (= 'marked_symbol (idx x 0)))
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.marked_symbol_is_val (lambda (x) (idx x 1))
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.marked_symbol_value (lambda (x) (idx x 2))
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later? (lambda (x) (or (and (marked_array? x) (= false (.marked_array_is_val x)))
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(and (marked_symbol? x) (= false (.marked_symbol_is_val x)))))
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comb? (lambda (x) (= 'comb (idx x 0)))
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.comb (lambda (x) (slice x 1 -1))
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prim_comb? (lambda (x) (= 'prim_comb (idx x 0)))
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.prim_comb (lambda (x) (idx x 1))
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marked_env? (lambda (x) (= 'env (idx x 0)))
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.env_marked (lambda (x) (idx x 1))
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.env_real (lambda (x) (idx x 2))
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env-lookup-helper (rec-lambda recurse (dict key i fail success) (cond (and (= i (- (len dict) 1)) (= nil (idx dict i))) (fail)
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(= i (- (len dict) 1)) (recurse (idx (idx dict i) 1) key 0 fail success)
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(= key (idx (idx dict i) 0)) (success (idx (idx dict i) 1))
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true (recurse dict key (+ i 1) fail success)))
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env-lookup (lambda (env key) (env-lookup-helper (idx env 1) key 0 (lambda () (error (str key " not found in env " (idx env 1)))) (lambda (x) x)))
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mark (rec-lambda recurse (x) (cond (env? x) (error (str "called mark with an env " x))
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(combiner? x) (error (str "called mark with a combiner " x))
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(symbol? x) ['marked_symbol false x]
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(array? x) ['marked_array false (map recurse x)]
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true ['val x]))
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strip (rec-lambda recurse (x)
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(do (println "calling strip with " x)
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(cond (val? x) (.val x)
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(marked_array? x) (let (stripped_values (map recurse (.marked_array_values x)))
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(if (.marked_array_is_val x) (cons array stripped_values)
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stripped_values))
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(marked_symbol? x) (if (.marked_symbol_is_val x) [quote (.marked_symbol_value x)]
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(.marked_symbol_value x))
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(comb? x) (let (c (idx x 7))
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(if (= nil c) (error (str "partial eval failed: regular stripping a combinator without a real combinator (due to nil enviornment, no doubt, but how?)" x))
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c))
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(prim_comb? x) (idx x 2)
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(marked_env? x) (error "Env escaped to strip!")
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true (error (str "some other strip? " x))
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))
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)
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; A bit wild, but what if instead of is_value we had an evaluation level integer, kinda like wrap?
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; when lowering, it could just turn into multiple evals or somesuch, though we'd have to be careful of envs...
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try_unval (rec-lambda recurse (x) (let (_ (println "try_unvaling " x) r
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(cond (marked_array? x) (if (not (.marked_array_is_val x)) [false nil]
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(let ([sub_ok subs] (foldl (lambda ([ok a] x) (let ([nok p] (recurse x))
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[(and ok nok) (concat a [p])]))
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[true []]
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(.marked_array_values x)))
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(if sub_ok [true ['marked_array false subs]]
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[false nil])))
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(marked_symbol? x) (if (.marked_symbol_is_val x) [true ['marked_symbol false (.marked_symbol_value x)]]
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[false nil])
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true [true x]
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) _ (println "\tresult was " r)) r)
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)
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try_unval_array (lambda (x) (foldl (lambda ([ok a] x) (let ([nok p] (try_unval x))
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[(and ok nok) (concat a [p])]))
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[true []]
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x))
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; This is a conservative analysis, since we can't always tell what constructs introduce
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; a new binding scope & would be shadowing... we should at least be able to implement it for
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; vau/lambda, but we won't at first
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closes_over_var_from_this_env_marked (rec-lambda recurse (env x) (cond
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(val? x) false
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(marked_symbol? x) (env-lookup-helper (concat (slice (idx env 1) 0 -2) [nil]) (.marked_symbol_value x) 0 (lambda () false) (lambda (x) [x]))
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(marked_array? x) (foldl (lambda (a x) (or a (recurse env x))) false (.marked_array_values x))
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(comb? x) (let (
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[wrap_level de? se variadic params body actual_function] (.comb x)
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; This is where we'd be smart and remove shadowed stuff
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; Also this won't work yet because env
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(error (str "haven't handled comb yet really either for closes_over_var_from_this_env_marked " x))
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) (or (recurse env se) (recurse env body)))
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(prim_comb? x) false
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; Should check to see if the env has anything form env in it, somehow? See if it has this env itself in it?
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(marked_env? x) (error "haven't handled env in closes_over_var_from_this_env_marked!")
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true (error (str "Something odd passed to closes_over_var_from_this_env_marked " x))
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))
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indent_str (rec-lambda recurse (i) (if (= i 0) ""
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(str " " (recurse (- i 1)))))
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partial_eval_helper (rec-lambda recurse (x env imm_eval indent)
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(cond (val? x) x
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(marked_env? x) x
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(comb? x) x
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(prim_comb? x) x
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(marked_symbol? x) (if (.marked_symbol_is_val x) x
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(env-lookup env (.marked_symbol_value x)))
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(marked_array? x) (cond (.marked_array_is_val x) x
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(= 0 (len (.marked_array_values x))) (error "Partial eval on empty array")
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true (let (values (.marked_array_values x)
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comb (recurse (idx values 0) env true (+ 1 indent))
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literal_params (slice values 1 -1)
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_ (println (indent_str indent) "Going to do an array call!")
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_ (println (indent_str indent) " total is " x)
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_ (println (indent_str indent) " evaled comb is " comb)
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)
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; Replacing the old note here with one that mentions that
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; we use the imm_eval to know if it's ok to generate
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; comb's without a real combiner (because it doesn't have a real env)
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; because in the imm_eval case we don't need a real combiner since
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; we're about to partial eval the call away
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(cond (later? comb) ['marked_array false (cons comb literal_params)]
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(prim_comb? comb) ((.prim_comb comb) env literal_params imm_eval (+ 1 indent))
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(comb? comb) (let (
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[wrap_level de? se variadic params body actual_function] (.comb comb)
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[ok appropriatly_evaled_params] ((rec-lambda param-recurse (wrap params)
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(if (!= 0 wrap)
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(let (rp_eval (lambda (p) (recurse p env false (+ 1 indent)))
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pre_evaled (map rp_eval params)
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[ok unval_params] (try_unval_array pre_evaled))
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(if (not ok) [ok nil]
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(let (evaled_params (map rp_eval unval_params))
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(param-recurse (- wrap 1) evaled_params))))
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[true params])
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) wrap_level literal_params)
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) (if (not ok) ['marked_array false (cons comb literal_params)]
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(let (
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final_params (if variadic (concat (slice appropriatly_evaled_params 0 (- (len params) 1))
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[['marked_array true (slice appropriatly_evaled_params (- (len params) 1) -1)]])
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appropriatly_evaled_params)
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de_entry (if (!= nil de?) [ [de? env] ] [])
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_ (println (indent_str indent) "final_params params " final_params)
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de_real_entry (if (!= nil de?) [ [de? (.env_real env)] ] [])
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se_real_env (.env_real se)
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inner_real_env (if (and se_real_env (or (not de?) (.env_real env)))
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(add-dict-to-env se_real_env
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(concat (zip params (map strip final_params))
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de_real_entry))
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nil)
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_ (println (indent_str indent) "Inner_real_env is " inner_real_env " because de_real " de_real_entry " se_real_env " se_real_env)
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inner_env ['env (concat (zip params final_params) de_entry [se]) inner_real_env]
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_ (println (indent_str indent) "going to eval " body " with inner_env is " inner_env)
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; Ok, this might be a later with un-evaled references to parameter symbols,
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; in which case we need to re-wrap up in a vau, since
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; if they're used as parameters to a 'later value that might be a vau,
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; since we don't know if they have to be evaluated and thus
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; can't partially evaluate them.
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; We check with closes_over_var_from_this_env_marked, which can be made more
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; sophisticated, see its definition
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func_result (recurse body inner_env imm_eval (+ 1 indent))
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_ (println (indent_str indent) "evaled result of function call (imm_eval was " imm_eval ") is " func_result)
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result (if (and (later? func_result)
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(closes_over_var_from_this_env_marked inner_env func_result))
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; this is exponential-y - we retry without imm to see if we can
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; have a better partial eval'd later instead of giving up entirely
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(let (comb (recurse (idx values 0) env false (+ 1 indent)))
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['marked_array false (cons comb literal_params)])
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func_result)
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) result)))
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true (error (str "Partial eval noticed that you will likely call not a function " comb " total is " x)))))
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true (error (str "impossible partial_eval value " x))
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)
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)
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is_all_values (lambda (evaled_params) (foldl (lambda (a x) (and a (not (later? x)))) true evaled_params))
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needs_params_val_lambda (vau de (f_sym) (let (
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actual_function (eval f_sym de)
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handler (rec-lambda recurse (de params imm_eval indent) (let (
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evaled_params (map (lambda (p) (partial_eval_helper p de false (+ 1 indent))) params)
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)
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(if (is_all_values evaled_params) (mark (lapply actual_function (map strip evaled_params)))
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['marked_array false (cons ['prim_comb recurse actual_function] evaled_params)])))
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) [f_sym ['prim_comb handler actual_function]]))
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give_up_eval_params (vau de (f_sym) (let (
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actual_function (eval f_sym de)
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handler (rec-lambda recurse (de params imm_eval indent) (let (
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evaled_params (map (lambda (p) (partial_eval_helper p de false (+ 1 indent))) params)
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)
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['marked_array false (cons ['prim_comb recurse actual_function] evaled_params)]))
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) [f_sym ['prim_comb handler actual_function]]))
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; !!!!!!
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; ! I think needs_params_val_lambda should be combined with parameters_evaled_proxy
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; !!!!!!
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parameters_evaled_proxy (rec-lambda recurse (pasthr_ie inner_f) (lambda (de params imm_eval indent) (let (
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[evaled_params l] (foldl (lambda ([ac i] p) (let (p (partial_eval_helper p de (if (= i pasthr_ie) imm_eval false) (+ 1 indent)))
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[(concat ac [p]) (+ i 1)]))
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[[] 0]
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params)
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) (inner_f (lambda (& args) (lapply (recurse passthrough_ie inner_f) args)) de evaled_params imm_eval indent))))
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root_marked_env ['env [
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; Ok, so for combinators, it should partial eval the body.
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; It should then check to see if the partial-evaled body has closed over
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; any 'later values from above the combinator. If so, the combinator should
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; evaluate to a ['later [vau de? params (strip partially_evaled_body)]], otherwise it can evaluate to a 'comb.
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; Note that this 'later may be re-evaluated later if the parent function is called.
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['vau ['prim_comb (rec-lambda recurse (de params imm_eval indent) (let (
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mde? (if (= 3 (len params)) (idx params 0))
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vau_mde? (if (= nil mde?) [] [mde?])
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de? (if mde? (.marked_symbol_value mde?))
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vau_de? (if (= nil de?) [] [de?])
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raw_marked_params (if (= nil de?) (idx params 0) (idx params 1))
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raw_params (map strip (.marked_array_values raw_marked_params))
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[variadic vau_params] (foldl (lambda ([v a] x) (if (= x '&) [true a] [v (concat a [x])])) [false []] raw_params)
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body (if (= nil de?) (idx params 1) (idx params 2))
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inner_env ['env (concat (map (lambda (p) [p ['marked_symbol false p]]) vau_params) (if (= nil de?) [] [ [de? ['marked_symbol false de?]] ]) [de]) nil]
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_ (map (lambda (x) (if (not (symbol? x)) (error (str "bad vau param not symbol " x " in " vau_params)))) vau_params)
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_ (println (indent_str indent) "in vau, evaluating body with 'later params - " body)
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pe_body (partial_eval_helper body inner_env false (+ 1 indent))
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_ (println (indent_str indent) "in vau, result of evaluating body was " pe_body " stripping")
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for_later (= nil (.env_real de))
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_ (println (indent_str indent) "imm_eval is " imm_eval " and for_later is " for_later " for " params " because of env being null " de)
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) (if for_later (if (not imm_eval) ['marked_array false (concat [['prim_comb recurse vau]] vau_mde? [raw_marked_params pe_body])]
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['comb 0 de? de variadic vau_params pe_body nil])
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(let (real_func (eval (concat [vau] vau_de? [raw_params (strip pe_body)]) (.env_real de))
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marked_func ['comb 0 de? de variadic vau_params pe_body real_func]
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_ (println (indent_str indent) "Marked func is " marked_func)
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) marked_func)))
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) vau]]
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['wrap ['prim_comb (parameters_evaled_proxy 0 (lambda (recurse de [evaled] imm_eval indent)
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(if (comb? evaled) (let ([wrap_level de? se variadic params body actual_function] (.comb evaled)
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wrapped_actual_fun (if (= nil actual_function) nil (wrap actual_function))
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wrapped_marked_fun ['comb (+ 1 wrap_level) de? se variadic params body wrapped_actual_fun]
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) wrapped_marked_fun)
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['marked_array false [['prim_comb recurse wrap] evaled]]))
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) wrap]]
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['unwrap ['prim_comb (parameters_evaled_proxy 0 (lambda (recurse de [evaled] imm_eval indent)
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(if (comb? evaled) (let ([wrap_level de? se variadic params body actual_function] (.comb evaled)
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unwrapped_actual_fun (if (= nil actual_function) nil (unwrap actual_function))
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unwrapped_marked_fun ['comb (- wrap_level 1) de? se variadic params body unwrapped_actual_fun]
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) unwrapped_marked_fun)
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['marked_array false [['prim_comb recurse wrap] evaled]]))
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) unwrap]]
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['eval ['prim_comb (rec-lambda recurse (de params imm_eval indent) (let (
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self ['prim_comb recurse eval]
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eval_env (if (= 2 (len params)) (partial_eval_helper (idx params 1) de false (+ 1 indent))
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de)
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) (if (not (marked_env? eval_env)) ['marked_array false (cons self params)]
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(let (
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_ (println (indent_str indent) "ok, env was " eval_env)
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body (partial_eval_helper (idx params 0) de imm_eval (+ 1 indent))
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_ (println (indent_str indent) "after first eval of param " body)
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[ok unval_body] (try_unval body1))
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body2 (if ok (partial_eval_helper unval_body eval_env imm_eval (+ 1 indent))
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['marked_array false (cons self (if (= 2 (len params)) [body1 eval_env]
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[body1]))])
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_ (println (indent_str indent) "and body2 is " body2)
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) body2)
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)) eval]]
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;TODO: This could go a lot farther, not stopping after the first 'later, etc
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; Also, GAH on odd params - but only one by one - a later odd param can't be imm_eval cuz it will
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; be frozen if an earlier cond is 'later....
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['cond ['prim_comb (parameters_evaled_proxy nil (lambda (recurse de evaled_params imm_eval indent)
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(if (!= 0 (% (len evaled_params) 2)) (error (str "partial eval cond with odd evaled_params " evaled_params))
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((rec-lambda recurse_inner (i)
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(cond (later? (idx evaled_params i)) ['marked_array false (cons ['prim_comb recurse cond] (slice evaled_params i -1))]
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(false? (idx evaled_params i)) (recurse_inner (+ 2 i))
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true (idx evaled_params (+ 1 i))) ; we could partially_eval again passing in immediate
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; eval if it was true, to partially counteract the above GAH
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) 0)
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)
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)) cond]]
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(needs_params_val_lambda symbol?)
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(needs_params_val_lambda int?)
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(needs_params_val_lambda string?)
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; not even a gah, but kinda!
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['combiner? ['prim_comb (parameters_evaled_proxy nil (lambda (recurse de [evaled_param] imm_eval indent)
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(cond (comb? evaled_param) ['val true]
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(prim_comb? evaled_param) ['val true]
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(later? evaled_param) ['marked_array false [['prim_comb recurse combiner?] evaled_param]]
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true ['val false]
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)
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)) combiner?]]
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; not even a gah, but kinda!
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['env? ['prim_comb (parameters_evaled_proxy nil (lambda (recurse de [evaled_param] imm_eval indent)
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(cond (marked_env? evaled_param) ['val true]
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(later? evaled_param) ['marked_array false [['prim_comb recurse env?] evaled_param]]
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true ['val false]
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)
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)) env?]]
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(needs_params_val_lambda nil?)
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(needs_params_val_lambda bool?)
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(needs_params_val_lambda str-to-symbol)
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(needs_params_val_lambda get-text)
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['array? ['prim_comb (parameters_evaled_proxy nil (lambda (recurse de [evaled_param] imm_eval indent)
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(cond
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(later? evaled_param) ['marked_array false [['prim_comb recurse array?] evaled_param]]
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(marked_array? evaled_param) ['val true]
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true ['val false]
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)
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)) array?]]
|
|
['array ['prim_comb (parameters_evaled_proxy nil (lambda (recurse de evaled_params imm_eval indent)
|
|
['marked_array true evaled_params]
|
|
)) array]]
|
|
['len ['prim_comb (parameters_evaled_proxy nil (lambda (recurse de [evaled_param] imm_eval indent)
|
|
(cond (later? evaled_param) ['marked_array false [['prim_comb recurse len] evaled_param]]
|
|
(marked_array? evaled_param) ['val (len (.marked_array_values evaled_param))]
|
|
true (error (str "bad type to len " evaled_param))
|
|
)
|
|
)) len]]
|
|
['idx ['prim_comb (parameters_evaled_proxy nil (lambda (recurse de [evaled_array evaled_idx] imm_eval indent)
|
|
(cond (and (val? evaled_idx) (marked_array? evaled_array) (.marked_array_is_val evaled_array)) (idx (.marked_array_values evaled_array) (.val evaled_idx))
|
|
true ['marked_array false [['prim_comb recurse idx] evaled_array evaled_idx]]
|
|
)
|
|
)) idx]]
|
|
['slice ['prim_comb (parameters_evaled_proxy nil (lambda (recurse de [evaled_array evaled_begin evaled_end] imm_eval indent)
|
|
(cond (and (val? evaled_begin) (val? evaled_end) (marked_array? evaled_array) (.marked_array_is_val evaled_array))
|
|
['marked_array true (slice (.marked_array_values evaled_array) (.val evaled_begin) (.val evaled_end))]
|
|
true ['marked_array false [['prim_comb recurse slice] evaled_array evaled_idx evaled_begin evaled_end]]
|
|
)
|
|
)) slice]]
|
|
['concat ['prim_comb (parameters_evaled_proxy nil (lambda (recurse de evaled_params imm_eval indent)
|
|
(cond (foldl (lambda (a x) (and a (and (marked_array? x) (.marked_array_is_val x))) true evaled_params) ['marked_array true (lapply concat (map (lambda (x)
|
|
(.marked_array_values x))
|
|
evaled_params))]
|
|
true ['marked_array false (cons ['prim_comb recurse concat] evaled_params)]
|
|
)
|
|
))) concat]]
|
|
(needs_params_val_lambda +)
|
|
(needs_params_val_lambda -)
|
|
(needs_params_val_lambda *)
|
|
(needs_params_val_lambda /)
|
|
(needs_params_val_lambda %)
|
|
(needs_params_val_lambda &)
|
|
(needs_params_val_lambda |)
|
|
(needs_params_val_lambda <<)
|
|
(needs_params_val_lambda >>)
|
|
(needs_params_val_lambda =)
|
|
(needs_params_val_lambda !=)
|
|
(needs_params_val_lambda <)
|
|
(needs_params_val_lambda <=)
|
|
(needs_params_val_lambda >)
|
|
(needs_params_val_lambda >=)
|
|
|
|
; these could both be extended to eliminate other known true values except for the end and vice-versa
|
|
['and ['prim_comb (parameters_evaled_proxy nil (lambda (recurse de evaled_params imm_eval indent)
|
|
((rec-lambda inner_recurse (i)
|
|
(cond (= i (- (len evaled_params) 1)) (idx evaled_params i)
|
|
(later? (idx evaled_params i)) ['marked_array false (cons ['prim_comb recurse and] (slice evaled_params i -1))]
|
|
(false? (idx evaled_params i)) (idx evaled_params i)
|
|
true (inner_recurse (+ 1 i)))
|
|
) 0)
|
|
)) and]]
|
|
; see above for improvement
|
|
['or ['prim_comb (parameters_evaled_proxy nil (lambda (recurse de evaled_params imm_eval indent)
|
|
((rec-lambda inner_recurse (i)
|
|
(cond (= i (- (len evaled_params) 1)) (idx evaled_params i)
|
|
(later? (idx evaled_params i)) ['marked_array false (cons ['prim_comb recurse or] (slice evaled_params i -1))]
|
|
(false? (idx evaled_params i)) (recurse (+ 1 i))
|
|
true (idx evaled_params i))
|
|
) 0)
|
|
)) or]]
|
|
; should make not a built in and then do here
|
|
; OR not - I think it will actually lower correctly partially evaled
|
|
|
|
(needs_params_val_lambda pr-str)
|
|
(needs_params_val_lambda str)
|
|
(needs_params_val_lambda prn)
|
|
(give_up_eval_params println)
|
|
; really do need to figure out if we want to keep meta, and add it if so
|
|
(give_up_eval_params meta)
|
|
(give_up_eval_params with-meta)
|
|
; if we want to get fancy, we could do error/recover too
|
|
(give_up_eval_params error)
|
|
(give_up_eval_params recover)
|
|
(needs_params_val_lambda read-string)
|
|
(give_up_eval_params slurp)
|
|
(give_up_eval_params get_line)
|
|
(give_up_eval_params write_file)
|
|
['empty_env ['env [] empty_env]]
|
|
nil
|
|
] root_env]
|
|
|
|
partial_eval (lambda (x) (partial_eval_helper (mark x) root_marked_env false 0))
|
|
)
|
|
(provide partial_eval strip)
|
|
))
|