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fix for Crystal 0.7.2

master
rhysd 9 years ago
parent
commit
3b31c5ab6d
2 changed files with 210 additions and 204 deletions
  1. +2
    -2
      README.md
  2. +208
    -202
      src/crisp.cr

+ 2
- 2
README.md View File

@ -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

+ 208
- 202
src/crisp.cr View File

@ -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

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