#! /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
# ("unquote" ...)
when head.is_a?(Mal::Symbol) && head.str == "unquote"
list[1]
- # (("splice-unquote" ...) ...)
+ # (("splice-unquote" ...) ...)
when pair?(head) && (arg0 = head.first.unwrap).is_a?(Mal::Symbol) && arg0.str == "splice-unquote"
tail = Mal::Type.new list[1..-1].to_mal
Mal::Type.new(
def macro_call?(ast, env)
list = ast.unwrap
return false unless list.is_a? Mal::List
+ return false if list.empty?
sym = list.first.unwrap
return false unless sym.is_a? Mal::Symbol
def macroexpand(ast, env)
while macro_call?(ast, env)
-
# Already checked in macro_call?
- list = ast.unwrap as Mal::List
- func_sym = list[0].unwrap as Mal::Symbol
+ list = ast.unwrap.as(Mal::List)
+ func_sym = list[0].unwrap.as(Mal::Symbol)
func = env.get(func_sym.str).unwrap
case func
# 'next' in 'do...end' has a bug in crystal 0.7.1
# https://github.com/manastech/crystal/issues/659
while true
- return eval_ast(ast, env) unless ast.unwrap.is_a? Mal::List
+ list = ast.unwrap
+
+ return eval_ast(ast, env) unless list.is_a? Mal::List
+ return ast if list.empty?
ast = macroexpand(ast, env)
list = ast.unwrap
- return ast unless list.is_a? Mal::List
+ return eval_ast(ast, env) unless list.is_a? Mal::List
return ast if list.empty?
head = list.first.unwrap
return invoke_list(list, env) unless head.is_a? Mal::Symbol
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: #{a1}" 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 #{name}" 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].to_mal, 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? Array
- eval_error "'fn*' parameters must be list or vector: #{params}"
- end
- Mal::Closure.new(list[2], params, env, func_of(env, params, list[2]))
- when "quote"
- list[1]
- when "quasiquote"
- ast = quasiquote list[1]
- next # TCO
- when "defmacro!"
- eval_error "wrong number of argument for 'defmacro!'" unless list.size == 3
- a1 = list[1].unwrap
- eval_error "1st argument of 'defmacro!' must be symbol: #{a1}" unless a1.is_a? Mal::Symbol
- env.set(a1.str, eval(list[2], env).tap{|n| n.is_macro = true})
- when "macroexpand"
- macroexpand(list[1], env)
- when "try*"
- catch_list = list[2].unwrap
- return eval(list[1], env) unless catch_list.is_a? Mal::List
-
- catch_head = catch_list.first.unwrap
- return eval(list[1], env) unless catch_head.is_a? Mal::Symbol
- return eval(list[1], env) unless catch_head.str == "catch*"
-
- begin
- eval(list[1], env)
- rescue e : Mal::RuntimeException
- new_env = Mal::Env.new(env, [catch_list[1]], [e.thrown])
- eval(catch_list[2], new_env)
- rescue e
- new_env = Mal::Env.new(env, [catch_list[1]], [Mal::Type.new e.message])
- eval(catch_list[2], new_env)
- end
+ 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: #{a1}" 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 #{name}" 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].to_mal, 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 or vector: #{params}"
+ end
+ Mal::Closure.new(list[2], params, env, func_of(env, params, list[2]))
+ when "quote"
+ list[1]
+ when "quasiquote"
+ ast = quasiquote list[1]
+ next # TCO
+ when "defmacro!"
+ eval_error "wrong number of argument for 'defmacro!'" unless list.size == 3
+ a1 = list[1].unwrap
+ eval_error "1st argument of 'defmacro!' must be symbol: #{a1}" unless a1.is_a? Mal::Symbol
+ env.set(a1.str, eval(list[2], env).tap { |n| n.is_macro = true })
+ when "macroexpand"
+ macroexpand(list[1], env)
+ when "try*"
+ catch_list = list.size >= 3 ? list[2].unwrap : Mal::Type.new(nil)
+ return eval(list[1], env) unless catch_list.is_a? Mal::List
+
+ catch_head = catch_list.first.unwrap
+ return eval(list[1], env) unless catch_head.is_a? Mal::Symbol
+ return eval(list[1], env) unless catch_head.str == "catch*"
+
+ begin
+ eval(list[1], env)
+ rescue e : Mal::RuntimeException
+ new_env = Mal::Env.new(env, [catch_list[1]], [e.thrown])
+ eval(catch_list[2], new_env)
+ rescue e
+ new_env = Mal::Env.new(env, [catch_list[1]], [Mal::Type.new e.message])
+ eval(catch_list[2], new_env)
end
+ 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], $repl_env) })
+REPL_ENV = Mal::Env.new nil
+Mal::NS.each { |k, v| REPL_ENV.set(k, Mal::Type.new(v)) }
+REPL_ENV.set("eval", Mal::Type.new ->(args : Array(Mal::Type)) { Mal.eval(args[0], REPL_ENV) })
Mal.rep "(def! not (fn* (a) (if a false true)))"
-Mal.rep "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))"
+Mal.rep "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \"\nnil)\")))))"
Mal.rep "(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs) (if (> (count xs) 1) (nth xs 1) (throw \"odd number of forms to cond\")) (cons 'cond (rest (rest xs)))))))"
-Mal.rep "(defmacro! or (fn* (& xs) (if (empty? xs) nil (if (= 1 (count xs)) (first xs) `(let* (or_FIXME ~(first xs)) (if or_FIXME or_FIXME (or ~@(rest xs))))))))"
-$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