env.lg

load "../logo/printer.lg
load "../logo/types.lg

to env_new :outer :binds :exprs
localmake "data []
if not emptyp :binds [
  localmake "i 0
  while [:i < _count :binds] [
    ifelse (nth :binds :i) = [symbol &] [
      localmake "val drop :exprs :i
      make "i (:i + 1)
      localmake "key nth :binds :i
    ] [
      localmake "val nth :exprs :i
      localmake "key nth :binds :i
    ]
    make "data hashmap_put :data :key :val
    make "i (:i + 1)
  ]
]
output listtoarray list :outer :data
end

to env_outer :env
output item 1 :env
end

to env_data :env
output item 2 :env
end

to env_find :env :key
if emptyp :env [output []]
localmake "val hashmap_get env_data :env :key
ifelse emptyp :val [
  output env_find env_outer :env :key
] [
  output :env
]
end

to env_get :env :key
localmake "foundenv env_find :env :key
if emptyp :foundenv [(throw "error sentence (word "' pr_str :key "true "' ) [not found])]
output hashmap_get env_data :foundenv :key
end

to env_set :env :key :val
.setitem 2 :env hashmap_put env_data :env :key :val
output :val
end