LispInSmallPieces/src/scope.coffee

32 lines
1.2 KiB
CoffeeScript

lispeval = require './eval'
{cons, car, cdr, nilp, nil, cadar, cadr, caddr} = require './lists'
{create_lisp_expression_evaluator, create_vm_expression_evaluator, create_special_form_evaluator} = require './fn'
scope = cons
'+': create_vm_expression_evaluator scope, [], (a, b) -> a + b
'-': create_vm_expression_evaluator scope, [], (a, b) -> a - b
'*': create_vm_expression_evaluator scope, [], (a, b) -> a * b
'/': create_vm_expression_evaluator scope, [], (a, b) -> a / b
'==': create_vm_expression_evaluator scope, [], (a, b) -> a == b
'#t': true
'#f': false
'define': create_special_form_evaluator scope, [], (nodes, scope) ->
current = (car scope)
current[(cadar nodes)] = lispeval((cadr nodes), scope)
'lambda': create_special_form_evaluator scope, [], (nodes, scope) ->
param_nodes = cadar nodes
reducer = (l) ->
if (nilp l) then nil else cons (cadar l), reducer(cdr l)
param_names = reducer(param_nodes)
create_lisp_expression_evaluator scope, param_names, (cdr nodes)
'if': create_special_form_evaluator scope, [], (nodes, scope) ->
if lispeval (car nodes), scope
lispeval (cadr nodes), scope
else
lispeval (caddr nodes), scope
module.exports = scope