#! /usr/bin/env crystal run
-require "./readline"
+require "readline"
require "./reader"
require "./printer"
require "./types"
# Note:
# Employed downcase names because Crystal prohibits uppercase names for methods
-def func_of(env, binds, body)
- -> (args : Array(Mal::Type)) {
- new_env = Mal::Env.new(env, binds, args)
- eval(body, new_env)
- } as Mal::Func
-end
+module Mal
+ extend self
+
+ def func_of(env, binds, body)
+ ->(args : Array(Mal::Type)) {
+ new_env = Mal::Env.new(env, binds, args)
+ eval(body, new_env)
+ }.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
+ def eval_ast(ast, env)
+ return ast.map { |n| eval(n, env).as(Mal::Type) } if ast.is_a? Mal::List
- val = ast.unwrap
+ val = ast.unwrap
- Mal::Type.new case val
- when Mal::Symbol
- if e = env.get(val.str)
- e
+ Mal::Type.new case val
+ when Mal::Symbol
+ if e = env.get(val.str)
+ e
+ else
+ eval_error "'#{val.str}' not found"
+ end
+ when Mal::List
+ 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) }
+ when Array(Mal::Type)
+ val.map { |n| eval(n, env).as(Mal::Type) }
+ when Mal::HashMap
+ val.each { |k, v| val[k] = eval(v, env) }
+ val
else
- eval_error "'#{val.str}' not found"
+ val
end
- when Mal::List
- 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)}
- when Array(Mal::Type)
- val.map{|n| eval(n, env)}
- when Mal::HashMap
- val.each{|k, v| val[k] = eval(v, env)}
- val
- else
- val
end
-end
-def read(str)
- read_str str
-end
+ def read(str)
+ read_str str
+ end
-macro pair?(list)
- {{list}}.is_a?(Array) && !{{list}}.empty?
-end
+ macro pair?(list)
+ {{list}}.is_a?(Array) && !{{list}}.empty?
+ end
-def quasiquote(ast)
- list = ast.unwrap
+ def quasiquote(ast)
+ list = ast.unwrap
- unless pair?(list)
- return Mal::Type.new(
- Mal::List.new << gen_type(Mal::Symbol, "quote") << ast
- )
- end
+ unless pair?(list)
+ return Mal::Type.new(
+ Mal::List.new << gen_type(Mal::Symbol, "quote") << ast
+ )
+ end
+
+ head = list.first.unwrap
- head = list.first.unwrap
-
- case
- # ("unquote" ...)
- when head.is_a?(Mal::Symbol) && head.str == "unquote"
- list[1]
- # (("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(
- Mal::List.new << gen_type(Mal::Symbol, "concat") << head[1] << quasiquote(tail)
- )
- else
- tail = Mal::Type.new list[1..-1].to_mal
- Mal::Type.new(
- Mal::List.new << gen_type(Mal::Symbol, "cons") << quasiquote(list.first) << quasiquote(tail)
- )
+ case
+ # ("unquote" ...)
+ when head.is_a?(Mal::Symbol) && head.str == "unquote"
+ list[1]
+ # (("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(
+ Mal::List.new << gen_type(Mal::Symbol, "concat") << head[1] << quasiquote(tail)
+ )
+ else
+ tail = Mal::Type.new list[1..-1].to_mal
+ Mal::Type.new(
+ Mal::List.new << gen_type(Mal::Symbol, "cons") << quasiquote(list.first) << quasiquote(tail)
+ )
+ end
end
-end
-def macro_call?(ast, env)
- list = ast.unwrap
- return false unless list.is_a? Mal::List
+ 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
+ sym = list.first.unwrap
+ return false unless sym.is_a? Mal::Symbol
- func = env.find(sym.str).try(&.data[sym.str])
- return false unless func && func.macro?
+ func = env.find(sym.str).try(&.data[sym.str])
+ return false unless func && func.macro?
- true
-end
+ true
+ end
-def macroexpand(ast, env)
- while macro_call?(ast, env)
+ 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)
+ func = env.get(func_sym.str).unwrap
+
+ case func
+ when Mal::Func
+ ast = func.call(list[1..-1])
+ when Mal::Closure
+ ast = func.fn.call(list[1..-1])
+ else
+ eval_error "macro '#{func_sym.str}' must be function: #{ast}"
+ end
+ end
- # Already checked in macro_call?
- list = ast.unwrap as Mal::List
- func_sym = list[0].unwrap as Mal::Symbol
- func = env.get(func_sym.str).unwrap
+ ast
+ end
- case func
- when Mal::Func
- ast = func.call(list[1..-1])
+ macro invoke_list(l, env)
+ f = eval({{l}}.first, {{env}}).unwrap
+ args = eval_ast({{l}}[1..-1].to_mal, {{env}})
+ case f
when Mal::Closure
- ast = func.fn.call(list[1..-1])
+ ast = f.ast
+ {{env}} = Mal::Env.new(f.env, f.params, args)
+ next # TCO
+ when Mal::Func
+ return f.call args
else
- eval_error "macro '#{func_sym.str}' must be function: #{ast}"
+ eval_error "expected function as the first argument: #{f}"
end
end
- ast
-end
+ def eval(ast, env)
+ # 'next' in 'do...end' has a bug in crystal 0.7.1
+ # https://github.com/manastech/crystal/issues/659
+ while true
+ list = ast.unwrap
-macro invoke_list(l, env)
- f = eval({{l}}.first, {{env}}).unwrap
- args = eval_ast({{l}}[1..-1].to_mal, {{env}})
- case f
- when Mal::Closure
- ast = f.ast
- {{env}} = Mal::Env.new(f.env, f.params, args)
- next # TCO
- when Mal::Func
- return f.call args
- else
- eval_error "expected function as the first argument: #{f}"
- end
-end
+ return eval_ast(ast, env) unless list.is_a? Mal::List
+ return ast if list.empty?
-def eval(ast, env)
- # '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
+ ast = macroexpand(ast, env)
- ast = macroexpand(ast, env)
+ list = ast.unwrap
- list = ast.unwrap
-
- return ast unless list.is_a? Mal::List
- return ast if list.empty?
+ return eval_ast(ast, env) unless list.is_a? Mal::List
+ return ast if list.empty?
- head = list.first.unwrap
+ head = list.first.unwrap
- return invoke_list(list, env) unless head.is_a? Mal::Symbol
+ return invoke_list(list, env) unless head.is_a? Mal::Symbol
- return Mal::Type.new case head.str
+ 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 "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})
+ 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
+ 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
else
invoke_list(list, env)
end
+ end
end
-end
-def print(result)
- pr_str(result, true)
-end
+ def print(result)
+ pr_str(result, true)
+ end
-def rep(str)
- print(eval(read(str), $repl_env))
+ def rep(str)
+ print(eval(read(str), REPL_ENV))
+ end
end
-$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)){ eval(args[0], $repl_env) })
-rep "(def! not (fn* (a) (if a false true)))"
-rep "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))"
-rep "(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs) (if (> (count xs) 1) (nth xs 1) (throw \"odd number of forms to cond\")) (cons 'cond (rest (rest xs)))))))"
-rep "(defmacro! or (fn* (& xs) (if (empty? xs) nil (if (= 1 (count xs)) (first xs) `(let* (or_FIXME ~(first xs)) (if or_FIXME or_FIXME (or ~@(rest xs))))))))"
+REPL_ENV = Mal::Env.new nil
+Mal::NS.each { |k, v| REPL_ENV.set(k, Mal::Type.new(v)) }
+REPL_ENV.set("eval", Mal::Type.new ->(args : Array(Mal::Type)) { Mal.eval(args[0], REPL_ENV) })
+Mal.rep "(def! not (fn* (a) (if a false true)))"
+Mal.rep "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \"\nnil)\")))))"
+Mal.rep "(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs) (if (> (count xs) 1) (nth xs 1) (throw \"odd number of forms to cond\")) (cons 'cond (rest (rest xs)))))))"
-$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
begin
- rep "(load-file \"#{ARGV[0]}\")"
+ Mal.rep "(load-file \"#{ARGV[0]}\")"
rescue e
STDERR.puts e
end
exit
end
-while line = my_readline("user> ")
+while line = Readline.readline("user> ", true)
begin
- puts rep(line)
+ 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