crystal/core.cr

   1 require "time"
   2
   3 require "./types"
   4 require "./error"
   5 require "./printer"
   6 require "./reader"
   7 require "./readline"
   8
   9 module Mal
  10
  11 macro calc_op(op)
  12   -> (args : Array(Mal::Type)) {
  13     x, y = args[0].unwrap, args[1].unwrap
  14     eval_error "invalid arguments for binary operator {{op.id}}" unless x.is_a?(Int32) && y.is_a?(Int32)
  15     Mal::Type.new(x {{op.id}} y)
  16   }
  17 end
  18
  19 def self.list(args)
  20   args.to_mal
  21 end
  22
  23 def self.list?(args)
  24   args.first.unwrap.is_a? Mal::List
  25 end
  26
  27 def self.empty?(args)
  28   a = args.first.unwrap
  29   a.is_a?(Array) ? a.empty? : false
  30 end
  31
  32 def self.count(args)
  33   a = args.first.unwrap
  34   case a
  35   when Array
  36     a.size as Int32
  37   when Nil
  38     0
  39   else
  40     eval_error "invalid argument for function 'count'"
  41   end
  42 end
  43
  44 def self.pr_str_(args)
  45   args.map{|a| pr_str(a)}.join(" ")
  46 end
  47
  48 def self.str(args)
  49   args.map{|a| pr_str(a, false)}.join
  50 end
  51
  52 def self.prn(args)
  53   puts self.pr_str_(args)
  54   nil
  55 end
  56
  57 def self.println(args)
  58   puts args.map{|a| pr_str(a, false)}.join(" ")
  59   nil
  60 end
  61
  62 def self.read_string(args)
  63   head = args.first.unwrap
  64   eval_error "argument of read-str must be string" unless head.is_a? String
  65   read_str head
  66 end
  67
  68 def self.slurp(args)
  69   head = args.first.unwrap
  70   eval_error "argument of slurp must be string" unless head.is_a? String
  71   begin
  72     File.read head
  73   rescue e : Errno
  74     eval_error "no such file"
  75   end
  76 end
  77
  78 def self.cons(args)
  79   head, tail = args[0] as Mal::Type, args[1].unwrap
  80   eval_error "2nd arg of cons must be list" unless tail.is_a? Array
  81   ([head] + tail).to_mal
  82 end
  83
  84 def self.concat(args)
  85   args.each_with_object(Mal::List.new) do |arg, list|
  86     a = arg.unwrap
  87     eval_error "arguments of concat must be list" unless a.is_a?(Array)
  88     a.each{|e| list << e}
  89   end
  90 end
  91
  92 def self.nth(args)
  93   a0, a1 = args[0].unwrap, args[1].unwrap
  94   eval_error "1st argument of nth must be list or vector" unless a0.is_a? Array
  95   eval_error "2nd argument of nth must be integer" unless a1.is_a? Int32
  96   a0[a1]
  97 end
  98
  99 def self.first(args)
 100   a0 = args[0].unwrap
 101
 102   return nil if a0.nil?
 103   eval_error "1st argument of first must be list or vector or nil" unless a0.is_a? Array
 104   a0.empty? ? nil : a0.first
 105 end
 106
 107 def self.rest(args)
 108   a0 = args[0].unwrap
 109
 110   return Mal::List.new if a0.nil?
 111   eval_error "1st argument of first must be list or vector or nil" unless a0.is_a? Array
 112   return Mal::List.new if a0.empty?
 113   a0[1..-1].to_mal
 114 end
 115
 116 def self.apply(args)
 117   eval_error "apply must take at least 2 arguments" unless args.size >= 2
 118
 119   head = args.first.unwrap
 120   last = args.last.unwrap
 121
 122   eval_error "last argument of apply must be list or vector" unless last.is_a? Array
 123
 124   case head
 125   when Mal::Closure
 126     head.fn.call(args[1..-2] + last)
 127   when Mal::Func
 128     head.call(args[1..-2] + last)
 129   else
 130     eval_error "1st argument of apply must be function or closure"
 131   end
 132 end
 133
 134 def self.map(args)
 135   func = args.first.unwrap
 136   list = args[1].unwrap
 137
 138   eval_error "2nd argument of map must be list or vector" unless list.is_a? Array
 139
 140   f = case func
 141       when Mal::Closure then func.fn
 142       when Mal::Func    then func
 143       else                   eval_error "1st argument of map must be function"
 144       end
 145
 146   list.each_with_object(Mal::List.new) do |elem, mapped|
 147     mapped << f.call([elem])
 148   end
 149 end
 150
 151 def self.nil?(args)
 152   args.first.unwrap.nil?
 153 end
 154
 155 def self.true?(args)
 156   a = args.first.unwrap
 157   a.is_a?(Bool) && a
 158 end
 159
 160 def self.false?(args)
 161   a = args.first.unwrap
 162   a.is_a?(Bool) && !a
 163 end
 164
 165 def self.symbol?(args)
 166   args.first.unwrap.is_a?(Mal::Symbol)
 167 end
 168
 169 def self.symbol(args)
 170   head = args.first.unwrap
 171   eval_error "1st argument of symbol function must be string" unless head.is_a? String
 172   Mal::Symbol.new head
 173 end
 174
 175 def self.keyword(args)
 176   head = args.first.unwrap
 177   eval_error "1st argument of symbol function must be string" unless head.is_a? String
 178   "\u029e" + head
 179 end
 180
 181 def self.keyword?(args)
 182   head = args.first.unwrap
 183   head.is_a?(String) && !head.empty? && head[0] == '\u029e'
 184 end
 185
 186 def self.vector(args)
 187   args.to_mal(Mal::Vector)
 188 end
 189
 190 def self.vector?(args)
 191   args.first.unwrap.is_a? Mal::Vector
 192 end
 193
 194 def self.hash_map(args)
 195   eval_error "hash-map must take even number of arguments" unless args.size.even?
 196   map = Mal::HashMap.new
 197   args.each_slice(2) do |kv|
 198     k = kv[0].unwrap
 199     eval_error "key must be string" unless k.is_a? String
 200     map[k] = kv[1]
 201   end
 202   map
 203 end
 204
 205 def self.map?(args)
 206   args.first.unwrap.is_a? Mal::HashMap
 207 end
 208
 209 def self.assoc(args)
 210   head = args.first.unwrap
 211   eval_error "1st argument of assoc must be hashmap" unless head.is_a? Mal::HashMap
 212   eval_error "assoc must take a list and even number of arguments" unless (args.size - 1).even?
 213
 214   map = Mal::HashMap.new
 215   head.each{|k, v| map[k] = v}
 216
 217   args[1..-1].each_slice(2) do |kv|
 218     k = kv[0].unwrap
 219     eval_error "key must be string" unless k.is_a? String
 220     map[k] = kv[1]
 221   end
 222
 223   map
 224 end
 225
 226 def self.dissoc(args)
 227   head = args.first.unwrap
 228   eval_error "1st argument of assoc must be hashmap" unless head.is_a? Mal::HashMap
 229
 230   map = Mal::HashMap.new
 231   head.each{|k,v| map[k] = v}
 232
 233   args[1..-1].each do |arg|
 234     key = arg.unwrap
 235     eval_error "key must be string" unless key.is_a? String
 236     map.delete key
 237   end
 238
 239   map
 240 end
 241
 242 def self.get(args)
 243   a0, a1 = args[0].unwrap, args[1].unwrap
 244   return nil unless a0.is_a? Mal::HashMap
 245   eval_error "2nd argument of get must be string" unless a1.is_a? String
 246
 247   # a0[a1]? isn't available because type ofa0[a1] is infered NoReturn
 248   a0.has_key?(a1) ? a0[a1] : nil
 249 end
 250
 251 def self.contains?(args)
 252   a0, a1 = args[0].unwrap, args[1].unwrap
 253   eval_error "1st argument of get must be hashmap" unless a0.is_a? Mal::HashMap
 254   eval_error "2nd argument of get must be string" unless a1.is_a? String
 255   a0.has_key? a1
 256 end
 257
 258 def self.keys(args)
 259   head = args.first.unwrap
 260   eval_error "1st argument of assoc must be hashmap" unless head.is_a? Mal::HashMap
 261   head.keys.each_with_object(Mal::List.new){|e,l| l << Mal::Type.new(e)}
 262 end
 263
 264 def self.vals(args)
 265   head = args.first.unwrap
 266   eval_error "1st argument of assoc must be hashmap" unless head.is_a? Mal::HashMap
 267   head.values.to_mal
 268 end
 269
 270 def self.sequential?(args)
 271   args.first.unwrap.is_a? Array
 272 end
 273
 274 def self.readline(args)
 275   head = args.first.unwrap
 276   eval_error "1st argument of readline must be string" unless head.is_a? String
 277   my_readline head
 278 end
 279
 280 def self.meta(args)
 281   m = args.first.meta
 282   m.nil? ? nil : m
 283 end
 284
 285 def self.with_meta(args)
 286   t = args.first.dup
 287   t.meta = args[1]
 288   t
 289 end
 290
 291 def self.atom(args)
 292   Mal::Atom.new args.first
 293 end
 294
 295 def self.atom?(args)
 296   args.first.unwrap.is_a? Mal::Atom
 297 end
 298
 299 def self.deref(args)
 300   head = args.first.unwrap
 301   eval_error "1st argument of deref must be atom" unless head.is_a? Mal::Atom
 302   head.val
 303 end
 304
 305 def self.reset!(args)
 306   head = args.first.unwrap
 307   eval_error "1st argument of reset! must be atom" unless head.is_a? Mal::Atom
 308   head.val = args[1]
 309 end
 310
 311 def self.swap!(args)
 312   atom = args.first.unwrap
 313   eval_error "1st argument of swap! must be atom" unless atom.is_a? Mal::Atom
 314
 315   a = [atom.val] + args[2..-1]
 316
 317   func = args[1].unwrap
 318   case func
 319   when Mal::Func
 320     atom.val = func.call a
 321   when Mal::Closure
 322     atom.val = func.fn.call a
 323   else
 324     eval_error "2nd argumetn of swap! must be function"
 325   end
 326 end
 327
 328 def self.conj(args)
 329   seq = args.first.unwrap
 330   case seq
 331   when Mal::List
 332     (args[1..-1].reverse + seq).to_mal
 333   when Mal::Vector
 334     (seq + args[1..-1]).to_mal(Mal::Vector)
 335   else
 336     eval_error "1st argument of conj must be list or vector"
 337   end
 338 end
 339
 340 def self.time_ms(args)
 341   (Time.now.to_i.to_i32) * 1000
 342 end
 343
 344 # Note:
 345 # Simply using ->self.some_func doesn't work
 346 macro func(name)
 347   -> (args : Array(Mal::Type)) { Mal::Type.new self.{{name.id}}(args) }
 348 end
 349
 350 macro rel_op(op)
 351 -> (args : Array(Mal::Type)) { Mal::Type.new (args[0] {{op.id}} args[1]) }
 352 end
 353
 354 NS = {
 355   "+"           => calc_op(:+)
 356   "-"           => calc_op(:-)
 357   "*"           => calc_op(:*)
 358   "/"           => calc_op(:/)
 359   "list"        => func(:list)
 360   "list?"       => func(:list?)
 361   "empty?"      => func(:empty?)
 362   "count"       => func(:count)
 363   "="           => rel_op(:==)
 364   "<"           => rel_op(:<)
 365   ">"           => rel_op(:>)
 366   "<="          => rel_op(:<=)
 367   ">="          => rel_op(:>=)
 368   "pr-str"      => func(:pr_str_)
 369   "str"         => func(:str)
 370   "prn"         => func(:prn)
 371   "println"     => func(:println)
 372   "read-string" => func(:read_string)
 373   "slurp"       => func(:slurp)
 374   "cons"        => func(:cons)
 375   "concat"      => func(:concat)
 376   "nth"         => func(:nth)
 377   "first"       => func(:first)
 378   "rest"        => func(:rest)
 379   "throw"       => -> (args : Array(Mal::Type)) { raise Mal::RuntimeException.new args[0] }
 380   "apply"       => func(:apply)
 381   "map"         => func(:map)
 382   "nil?"        => func(:nil?)
 383   "true?"       => func(:true?)
 384   "false?"      => func(:false?)
 385   "symbol?"     => func(:symbol?)
 386   "symbol"      => func(:symbol)
 387   "keyword"     => func(:keyword)
 388   "keyword?"    => func(:keyword?)
 389   "vector"      => func(:vector)
 390   "vector?"     => func(:vector?)
 391   "hash-map"    => func(:hash_map)
 392   "map?"        => func(:map?)
 393   "assoc"       => func(:assoc)
 394   "dissoc"      => func(:dissoc)
 395   "get"         => func(:get)
 396   "contains?"   => func(:contains?)
 397   "keys"        => func(:keys)
 398   "vals"        => func(:vals)
 399   "sequential?" => func(:sequential?)
 400   "readline"    => func(:readline)
 401   "meta"        => func(:meta)
 402   "with-meta"   => func(:with_meta)
 403   "atom"        => func(:atom)
 404   "atom?"       => func(:atom?)
 405   "deref"       => func(:deref)
 406   "deref"       => func(:deref)
 407   "reset!"      => func(:reset!)
 408   "swap!"       => func(:swap!)
 409   "conj"        => func(:conj)
 410   "time-ms"     => func(:time_ms)
 411 } of String => Mal::Func
 412
 413 end