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module demo::lang::Lisra::Runtime

rascal-0.40.17

Usage​

import demo::lang::Lisra::Runtime;

Dependencies​

import Prelude;

data Lval​

data Lval  
     = Integer(int n)
     | Atom(str name)
     | List(list[Lval] elms)
     | Closure(Result(list[Lval] args, Env env))
     ;

alias Scope​

map[Lval,Lval]

alias Env​

list[Scope]

function makeEnv​

Env makeEnv(list[Lval] vars, list[Lval] values, Env outer) =      ❸  
   [(vars[i] : values[i] | i <- index(vars))] + outer;

function find​

int find(Lval sym, Env e){      ❹  
   for(n <- index(e))
       if(e[n][sym]?)
          return n;
   return -1;
}

alias Result​

tuple[Lval val, Env env]