;;; -*- logo -*-

to cascade :cascade.limit [:cascade.inputs] 3
if numberp :cascade.limit ~
   [if lessp :cascade.limit 0 ~
       [(throw "error (se [cascade doesn't like] :cascade.limit [as input]))] ~
    make "cascade.limit `[greaterp :template.number ,[int :cascade.limit]]]
local [cascade.templates template.vars cascade.final]
make "cascade.templates []
make "template.vars []
make "cascade.final [?1]
cascade.setup :cascade.inputs
op cascade1 1 :template.vars
end

to cascade.setup :inputs
if emptyp :inputs [stop]
if emptyp bf :inputs [make "cascade.final first :inputs stop]
make "cascade.templates lput first :inputs :cascade.templates
make "template.vars lput first bf :inputs :template.vars
cascade.setup bf bf :inputs
end

to cascade1 :template.number :template.vars
if apply :cascade.limit :template.vars [op apply :cascade.final :template.vars]
op cascade1 (:template.number+1) (cascade.eval :cascade.templates)
end

to cascade.eval :cascade.templates
if emptyp :cascade.templates [op []]
op fput (apply first :cascade.templates :template.vars) ~
        (cascade.eval bf :cascade.templates)
end

bury [cascade cascade.setup cascade1 cascade.eval]