fix for Crystal 0.7.2

README.md

@@ -12,7 +12,7 @@ This project is a toy box for my dynamic language ideas.
   - [ ] Make `is_a?` guards more elegant
   - [ ] Import test cases from Mal
   - [ ] Add CI
-  - [ ] More OOP (`evaluator`)
+  - [ ] More OOP (`evaluator`, remove global variable, move states into object)
   - [x] Use standard `readline` implementation
   - [ ] Better lexer and parser
   - [ ] Add examples
@@ -29,7 +29,7 @@ This project is a toy box for my dynamic language ideas.
 ## Development Environment
 
 - OS X
-- Crystal 0.7.1
+- Crystal 0.7.1, 0.7.2
 
 ## License
 

src/crisp.cr

@@ -13,243 +13,247 @@ require "./error"
 # Note:
 # Employed downcase names because Crystal prohibits uppercase names for methods
 
-def func_of(env, binds, body)
-  -> (args : Array(Crisp::Type)) {
-    new_env = Crisp::Env.new(env, binds, args)
-    eval(body, new_env)
-  } as Crisp::Func
-end
+module Crisp
+  extend self
+
+  def func_of(env, binds, body)
+    -> (args : Array(Crisp::Type)) {
+      new_env = Crisp::Env.new(env, binds, args)
+      eval(body, new_env)
+    } as Crisp::Func
+  end
 
-def eval_ast(ast, env)
-  return ast.map{|n| eval(n, env) as Crisp::Type} if ast.is_a? Array
+  def eval_ast(ast, env)
+    return ast.map{|n| eval(n, env) as Crisp::Type} if ast.is_a? Array
 
-  val = ast.unwrap
+    val = ast.unwrap
 
-  Crisp::Type.new case val
-  when Crisp::Symbol
-    if e = env.get(val.str)
-      e
+    Crisp::Type.new case val
+    when Crisp::Symbol
+      if e = env.get(val.str)
+        e
+      else
+        eval_error "'#{val.str}' not found"
+      end
+    when Crisp::List
+      val.each_with_object(Crisp::List.new){|n, l| l << eval(n, env)}
+    when Crisp::Vector
+      val.each_with_object(Crisp::Vector.new){|n, l| l << eval(n, env)}
+    when Crisp::HashMap
+      new_map = Crisp::HashMap.new
+      val.each{|k, v| new_map[k] = eval(v, env)}
+      new_map
     else
-      eval_error "'#{val.str}' not found"
+      val
     end
-  when Crisp::List
-    val.each_with_object(Crisp::List.new){|n, l| l << eval(n, env)}
-  when Crisp::Vector
-    val.each_with_object(Crisp::Vector.new){|n, l| l << eval(n, env)}
-  when Crisp::HashMap
-    new_map = Crisp::HashMap.new
-    val.each{|k, v| new_map[k] = eval(v, env)}
-    new_map
-  else
-    val
   end
-end
-
-def read(str)
-  read_str str
-end
 
-macro pair?(list)
-  {{list}}.is_a?(Array) && !{{list}}.empty?
-end
-
-def quasiquote(ast)
-  list = ast.unwrap
-
-  unless pair?(list)
-    return Crisp::Type.new(
-      Crisp::List.new << gen_type(Crisp::Symbol, "quote") << ast
-    )
+  def read(str)
+    read_str str
   end
 
-  head = list.first.unwrap
-
-  case
-  # ("unquote" ...)
-  when head.is_a?(Crisp::Symbol) && head.str == "unquote"
-    list[1]
-  # (("splice-unquote" ...) ...)
-  when pair?(head) && (arg0 = head.first.unwrap).is_a?(Crisp::Symbol) && arg0.str == "splice-unquote"
-    tail = Crisp::Type.new list[1..-1].to_crisp_value
-    Crisp::Type.new(
-      Crisp::List.new << gen_type(Crisp::Symbol, "concat") << head[1] << quasiquote(tail)
-    )
-  else
-    tail = Crisp::Type.new list[1..-1].to_crisp_value
-    Crisp::Type.new(
-      Crisp::List.new << gen_type(Crisp::Symbol, "cons") << quasiquote(list.first) << quasiquote(tail)
-    )
+  macro pair?(list)
+    {{list}}.is_a?(Array) && !{{list}}.empty?
   end
-end
-
-def macro_call?(ast, env)
-  list = ast.unwrap
-  return false unless list.is_a? Crisp::List
-  return false if list.empty?
-
-  sym = list.first.unwrap
-  return false unless sym.is_a? Crisp::Symbol
 
-  func = env.find(sym.str).try(&.data[sym.str])
-  return false unless func && func.macro?
-
-  true
-end
+  def quasiquote(ast)
+    list = ast.unwrap
 
-def macroexpand(ast, env)
-  while macro_call?(ast, env)
+    unless pair?(list)
+      return Crisp::Type.new(
+        Crisp::List.new << gen_type(Crisp::Symbol, "quote") << ast
+      )
+    end
 
-    # Already checked in macro_call?
-    list = ast.unwrap as Crisp::List
-    func_sym = list[0].unwrap as Crisp::Symbol
-    func = env.get(func_sym.str).unwrap
+    head = list.first.unwrap
 
-    case func
-    when Crisp::Func
-      ast = func.call(list[1..-1])
-    when Crisp::Closure
-      ast = func.fn.call(list[1..-1])
+    case
+    # ("unquote" ...)
+    when head.is_a?(Crisp::Symbol) && head.str == "unquote"
+      list[1]
+    # (("splice-unquote" ...) ...)
+    when pair?(head) && (arg0 = head.first.unwrap).is_a?(Crisp::Symbol) && arg0.str == "splice-unquote"
+      tail = Crisp::Type.new list[1..-1].to_crisp_value
+      Crisp::Type.new(
+        Crisp::List.new << gen_type(Crisp::Symbol, "concat") << head[1] << quasiquote(tail)
+      )
     else
-      eval_error "macro '#{func_sym.str}' must be function: #{ast}"
+      tail = Crisp::Type.new list[1..-1].to_crisp_value
+      Crisp::Type.new(
+        Crisp::List.new << gen_type(Crisp::Symbol, "cons") << quasiquote(list.first) << quasiquote(tail)
+      )
     end
   end
 
-  ast
-end
+  def macro_call?(ast, env)
+    list = ast.unwrap
+    return false unless list.is_a? Crisp::List
+    return false if list.empty?
 
-macro invoke_list(l, env)
-  f = eval({{l}}.first, {{env}}).unwrap
-  args = eval_ast({{l}}[1..-1], {{env}}) as Array
-
-  case f
-  when Crisp::Closure
-    ast = f.ast
-    {{env}} = Crisp::Env.new(f.env, f.params, args)
-    next # TCO
-  when Crisp::Func
-    return f.call args
-  else
-    eval_error "expected function as the first argument: #{f}"
-  end
-end
+    sym = list.first.unwrap
+    return false unless sym.is_a? Crisp::Symbol
 
-def debug(ast)
-  puts print(ast).colorize.red
-end
+    func = env.find(sym.str).try(&.data[sym.str])
+    return false unless func && func.macro?
 
-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? Crisp::List
+    true
+  end
 
-    ast = macroexpand(ast, env)
+  def macroexpand(ast, env)
+    while macro_call?(ast, env)
 
-    list = ast.unwrap
+      # Already checked in macro_call?
+      list = ast.unwrap as Crisp::List
+      func_sym = list[0].unwrap as Crisp::Symbol
+      func = env.get(func_sym.str).unwrap
 
-    return ast unless list.is_a? Crisp::List
-    return ast if list.empty?
+      case func
+      when Crisp::Func
+        ast = func.call(list[1..-1])
+      when Crisp::Closure
+        ast = func.fn.call(list[1..-1])
+      else
+        eval_error "macro '#{func_sym.str}' must be function: #{ast}"
+      end
+    end
 
-    head = list.first.unwrap
+    ast
+  end
 
-    return invoke_list(list, env) unless head.is_a? Crisp::Symbol
-
-    return Crisp::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? Crisp::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 = Crisp::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? Crisp::Symbol
-          new_env.set(name.str, eval(value, new_env))
-        end
+  macro invoke_list(l, env)
+    f = eval({{l}}.first, {{env}}).unwrap
+    args = eval_ast({{l}}[1..-1], {{env}}) as Array
 
-        ast, env = list[2], new_env
-        next # TCO
-      when "do"
-        if list.empty?
-          ast = Crisp::Type.new nil
-          next
-        end
+    case f
+    when Crisp::Closure
+      ast = f.ast
+      {{env}} = Crisp::Env.new(f.env, f.params, args)
+      next # TCO
+    when Crisp::Func
+      return f.call args
+    else
+      eval_error "expected function as the first argument: #{f}"
+    end
+  end
 
-        eval_ast(list[1..-2].to_crisp_value, env)
-        ast = list.last
-        next # TCO
-      when "if"
-        ast = unless eval(list[1], env).unwrap
-          list.size >= 4 ? list[3] : Crisp::Type.new(nil)
+  def debug(ast)
+    puts print(ast).colorize.red
+  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
+      return eval_ast(ast, env) unless ast.unwrap.is_a? Crisp::List
+
+      ast = macroexpand(ast, env)
+
+      list = ast.unwrap
+
+      return ast unless list.is_a? Crisp::List
+      return ast if list.empty?
+
+      head = list.first.unwrap
+
+      return invoke_list(list, env) unless head.is_a? Crisp::Symbol
+
+      return Crisp::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? Crisp::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 = Crisp::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? Crisp::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 = Crisp::Type.new nil
+            next
+          end
+
+          eval_ast(list[1..-2].to_crisp_value, env)
+          ast = list.last
+          next # TCO
+        when "if"
+          ast = unless eval(list[1], env).unwrap
+            list.size >= 4 ? list[3] : Crisp::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
+          Crisp::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? Crisp::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? Crisp::List
+
+          catch_head = catch_list.first.unwrap
+          return eval(list[1], env) unless catch_head.is_a? Crisp::Symbol
+          return eval(list[1], env) unless catch_head.str == "catch*"
+
+          begin
+            eval(list[1], env)
+          rescue e : Crisp::RuntimeException
+            new_env = Crisp::Env.new(env, [catch_list[1]], [e.thrown])
+            eval(catch_list[2], new_env)
+          rescue e
+            new_env = Crisp::Env.new(env, [catch_list[1]], [Crisp::Type.new e.message])
+            eval(catch_list[2], new_env)
+          end
         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}"
+          invoke_list(list, env)
         end
-        Crisp::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? Crisp::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? Crisp::List
-
-        catch_head = catch_list.first.unwrap
-        return eval(list[1], env) unless catch_head.is_a? Crisp::Symbol
-        return eval(list[1], env) unless catch_head.str == "catch*"
-
-        begin
-          eval(list[1], env)
-        rescue e : Crisp::RuntimeException
-          new_env = Crisp::Env.new(env, [catch_list[1]], [e.thrown])
-          eval(catch_list[2], new_env)
-        rescue e
-          new_env = Crisp::Env.new(env, [catch_list[1]], [Crisp::Type.new e.message])
-          eval(catch_list[2], new_env)
-        end
-      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 = Crisp::Env.new nil
 Crisp::NS.each{|k,v| $repl_env.set(k, Crisp::Type.new(v))}
-$repl_env.set("eval", Crisp::Type.new -> (args: Array(Crisp::Type)){ eval(args[0], $repl_env) })
-rep "(def! not (fn* (a) (if a false true)))"
-rep "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))"
-rep "(defmacro! cond (fn* (& xs) (if (> (count xs) 0) (list 'if (first xs) (if (> (count xs) 1) (nth xs 1) (throw \"odd number of forms to cond\")) (cons 'cond (rest (rest xs)))))))"
-rep "(defmacro! or (fn* (& xs) (if (empty? xs) nil (if (= 1 (count xs)) (first xs) `(let* (or_FIXME ~(first xs)) (if or_FIXME or_FIXME (or ~@(rest xs))))))))"
-rep("(def! *host-language* \"crystal\")")
+$repl_env.set("eval", Crisp::Type.new -> (args: Array(Crisp::Type)){ Crisp.eval(args[0], $repl_env) })
+Crisp.rep "(def! not (fn* (a) (if a false true)))"
+Crisp.rep "(def! load-file (fn* (f) (eval (read-string (str \"(do \" (slurp f) \")\")))))"
+Crisp.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)))))))"
+Crisp.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))))))))"
+Crisp.rep("(def! *host-language* \"crystal\")")
 
 $argv = Crisp::List.new
 $repl_env.set("*ARGV*", Crisp::Type.new $argv)
@@ -262,16 +266,18 @@ unless ARGV.empty?
   end
 
   begin
-    rep "(load-file \"#{ARGV[0]}\")"
+    Crisp.rep "(load-file \"#{ARGV[0]}\")"
   rescue e
     STDERR.puts e
+    exit 1
   end
+
   exit
 end
 
 while line = Readline.readline("Crisp> ", true)
   begin
-    puts rep(line)
+    puts Crisp.rep(line)
   rescue e
     STDERR.puts e
   end