#! /usr/bin/env crystal run
-require "./readline"
+require "readline"
require "./reader"
require "./printer"
require "./types"
extend self
def func_of(env, binds, body)
- -> (args : Array(Mal::Type)) {
+ ->(args : Array(Mal::Type)) {
new_env = Mal::Env.new(env, binds, args)
eval(body, new_env)
- } as Mal::Func
+ }.as(Mal::Func)
end
def eval_ast(ast, env)
- return ast.map{|n| eval(n, env) as Mal::Type} if ast.is_a? Mal::List
+ return ast.map { |n| eval(n, env).as(Mal::Type) } if ast.is_a? Mal::List
val = ast.unwrap
eval_error "'#{val.str}' not found"
end
when Mal::List
- val.each_with_object(Mal::List.new){|n, l| l << eval(n, env)}
+ val.each_with_object(Mal::List.new) { |n, l| l << eval(n, env) }
when Mal::Vector
- val.each_with_object(Mal::Vector.new){|n, l| l << eval(n, env)}
+ val.each_with_object(Mal::Vector.new) { |n, l| l << eval(n, env) }
when Array(Mal::Type)
- val.map{|n| eval(n, env)}
+ val.map { |n| eval(n, env).as(Mal::Type) }
when Mal::HashMap
- val.each{|k, v| val[k] = eval(v, env)}
+ val.each { |k, v| val[k] = eval(v, env) }
val
else
val
f = eval(list.first, env).unwrap
case f
when Mal::Closure
- f.fn.call eval_ast(list[1..-1].each_with_object(Mal::List.new){|i, l| l << i}, env)
+ f.fn.call eval_ast(list[1..-1].each_with_object(Mal::List.new) { |i, l| l << i }, env)
when Mal::Func
- f.call eval_ast(list[1..-1].each_with_object(Mal::List.new){|i, l| l << i}, env)
+ f.call eval_ast(list[1..-1].each_with_object(Mal::List.new) { |i, l| l << i }, env)
else
eval_error "expected function as the first argument"
end
end
return Mal::Type.new case head.str
- when "def!"
- eval_error "wrong number of argument for 'def!'" unless list.size == 3
- a1 = list[1].unwrap
- eval_error "1st argument of 'def!' must be symbol" unless a1.is_a? Mal::Symbol
- env.set(a1.str, eval(list[2], env))
- when "let*"
- eval_error "wrong number of argument for 'def!'" unless list.size == 3
-
- bindings = list[1].unwrap
- eval_error "1st argument of 'let*' must be list or vector" unless bindings.is_a? Array
- eval_error "size of binding list must be even" unless bindings.size.even?
-
- new_env = Mal::Env.new env
- bindings.each_slice(2) do |binding|
- key, value = binding
- name = key.unwrap
- eval_error "name of binding must be specified as symbol" unless name.is_a? Mal::Symbol
- new_env.set(name.str, eval(value, new_env))
- end
-
- ast, env = list[2], new_env
- next # TCO
- when "do"
- if list.empty?
- ast = Mal::Type.new nil
- next
- end
-
- eval_ast(list[1..-2].each_with_object(Mal::List.new){|i,l| l << i}, env)
- ast = list.last
- next # TCO
- when "if"
- ast = unless eval(list[1], env).unwrap
- list.size >= 4 ? list[3] : Mal::Type.new(nil)
- else
- list[2]
- end
- next # TCO
- when "fn*"
- params = list[1].unwrap
- unless params.is_a?(Mal::List) || params.is_a?(Mal::Vector)
- eval_error "'fn*' parameters must be list"
- end
- Mal::Closure.new(list[2], params, env, func_of(env, params, list[2]))
+ when "def!"
+ eval_error "wrong number of argument for 'def!'" unless list.size == 3
+ a1 = list[1].unwrap
+ eval_error "1st argument of 'def!' must be symbol" unless a1.is_a? Mal::Symbol
+ env.set(a1.str, eval(list[2], env))
+ when "let*"
+ eval_error "wrong number of argument for 'def!'" unless list.size == 3
+
+ bindings = list[1].unwrap
+ eval_error "1st argument of 'let*' must be list or vector" unless bindings.is_a? Array
+ eval_error "size of binding list must be even" unless bindings.size.even?
+
+ new_env = Mal::Env.new env
+ bindings.each_slice(2) do |binding|
+ key, value = binding
+ name = key.unwrap
+ eval_error "name of binding must be specified as symbol" unless name.is_a? Mal::Symbol
+ new_env.set(name.str, eval(value, new_env))
+ end
+
+ ast, env = list[2], new_env
+ next # TCO
+ when "do"
+ if list.empty?
+ ast = Mal::Type.new nil
+ next
+ end
+
+ eval_ast(list[1..-2].each_with_object(Mal::List.new) { |i, l| l << i }, env)
+ ast = list.last
+ next # TCO
+ when "if"
+ ast = unless eval(list[1], env).unwrap
+ list.size >= 4 ? list[3] : Mal::Type.new(nil)
else
- invoke_list(list, env)
+ list[2]
end
+ next # TCO
+ when "fn*"
+ params = list[1].unwrap
+ unless params.is_a? Array
+ eval_error "'fn*' parameters must be list"
+ end
+ Mal::Closure.new(list[2], params, env, func_of(env, params, list[2]))
+ else
+ invoke_list(list, env)
+ end
end
end
end
def rep(str)
- print(eval(read(str), $repl_env))
+ print(eval(read(str), REPL_ENV))
end
end
-$repl_env = Mal::Env.new nil
-Mal::NS.each{|k,v| $repl_env.set(k, Mal::Type.new(v))}
-$repl_env.set("eval", Mal::Type.new -> (args: Array(Mal::Type)){ Mal.eval(args[0], $repl_env) })
+REPL_ENV = Mal::Env.new nil
+Mal::NS.each { |k, v| REPL_ENV.set(k, Mal::Type.new(v)) }
+REPL_ENV.set("eval", Mal::Type.new ->(args : Array(Mal::Type)) { Mal.eval(args[0], REPL_ENV) })
Mal.rep "(def! not (fn* (a) (if a false true)))"
Mal.rep "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))"
-$argv = Mal::List.new
-$repl_env.set("*ARGV*", Mal::Type.new $argv)
+argv = Mal::List.new
+REPL_ENV.set("*ARGV*", Mal::Type.new argv)
unless ARGV.empty?
if ARGV.size > 1
ARGV[1..-1].each do |a|
- $argv << Mal::Type.new(a)
+ argv << Mal::Type.new(a)
end
end
exit
end
-while line = my_readline("user> ")
+while line = Readline.readline("user> ", true)
begin
puts Mal.rep(line)
+ rescue e : Mal::RuntimeException
+ STDERR.puts "Error: #{pr_str(e.thrown, true)}"
rescue e
- STDERR.puts e
+ STDERR.puts "Error: #{e}"
end
end
HCoop / jackhill / mal.git / blobdiff