mirror of
https://github.com/kanaka/mal.git
synced 2024-09-20 18:18:51 +03:00
26 lines
774 B
Nim
26 lines
774 B
Nim
import tables, types
|
|
|
|
proc initEnv*(outer: Env = nil, binds, exprs: MalType = nilObj): Env =
|
|
result = Env(data: initTable[string, MalType](), outer: outer)
|
|
|
|
if binds.kind in {List, Vector}:
|
|
for i, e in binds.list:
|
|
if e.str == "&":
|
|
result.data[binds.list[i+1].str] = list(exprs.list[i .. ^1])
|
|
break
|
|
else:
|
|
result.data[e.str] = exprs.list[i]
|
|
|
|
proc set*(e: var Env, key: string, value: MalType): MalType {.discardable.} =
|
|
e.data[key] = value
|
|
value
|
|
|
|
proc find*(e: Env, key: string): Env =
|
|
if e.data.hasKey(key): return e
|
|
if e.outer != nil: return e.outer.find(key)
|
|
|
|
proc get*(e: Env, key: string): MalType =
|
|
let env = e.find(key)
|
|
if env == nil: raise newException(ValueError, "'" & key & "' not found")
|
|
env.data[key]
|