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add cons

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vonhyou 2021-04-14 08:12:23 +08:00
parent 2aa2758d05
commit 926a84c8a6
1 changed files with 23 additions and 3 deletions
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26
minlisp.rb
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@ -72,8 +72,9 @@ def generate_env
'max': ->(*args) { args.max },
'car': ->(arr) { arr[0] },
'cdr': ->(arr) { arr[1..-1] },
'cons': ->(arr) { arr },
'print': ->(arg) { p arg },
'begin': ->(*args) { true }
'begin': ->(*_args) { true }
}
end
@ -87,7 +88,8 @@ end
##### Lisp Eval
def lisp_eval(elem, env = generate_env)
$global_env = generate_env
def lisp_eval(elem, env = $global_env)
if elem.instance_of?(Symbol)
env[elem]
elsif elem.instance_of?(Integer) || elem.instance_of?(Float)
@ -109,4 +111,22 @@ end
# p lisp_eval(parse '(/ (+ 1 (* 2 3) 1 1 (+ 1 (- 7 2) 1)) 4)')
lisp_eval(parse '(begin (def var1 7) (print (if (> var1 1) (+ 1 30) (- 10 2))))')
# lisp_eval(parse '(begin (def var1 7) (print (if (> var1 1) (+ 1 30) (- 10 2))))')
##### REPL
def repl(prompt='minlisp>> ')
loop do
print prompt
val = lisp_eval(parse(gets.chomp))
print_value val unless val.nil?
end
end
def print_value(value)
puts value.to_s
end
repl()
# lisp_eval(parse('(begin (def var1 7) (if (> var1 8) (+ 3 11) (/ 7 3)))'))