Add Symbol#to_proc, Symbol.all_symbols

build_config.rb

@@ -47,6 +47,9 @@ MRuby::Build.new do |conf|
   # Use extensional Proc class
   conf.gem "#{root}/mrbgems/mruby-proc-ext"
 
+  # Use extensional Symbol class
+  conf.gem "#{root}/mrbgems/mruby-symbol-ext"
+
   # Use Random class
   conf.gem "#{root}/mrbgems/mruby-random"
 

mrbgems/mruby-symbol-ext/mrbgem.rake

@@ -0,0 +1,4 @@
+MRuby::Gem::Specification.new('mruby-symbol-ext') do |spec|
+  spec.license = 'MIT'
+  spec.authors = 'mruby developers'
+end

mrbgems/mruby-symbol-ext/mrblib/symbol.rb

@@ -0,0 +1,9 @@
+class Symbol
+
+  def to_proc
+    Proc.new do |obj, *args|
+      obj.send(self, *args)
+    end
+  end
+
+end

mrbgems/mruby-symbol-ext/src/symbol.c

@@ -0,0 +1,55 @@
+#include "mruby.h"
+#include "mruby/khash.h"
+#include "mruby/array.h"
+
+typedef struct symbol_name {
+  size_t len;
+  const char *name;
+} symbol_name;
+
+KHASH_DECLARE(n2s, symbol_name, mrb_sym, 1)
+
+/*
+ *  call-seq:
+ *     Symbol.all_symbols    => array
+ *
+ *  Returns an array of all the symbols currently in Ruby's symbol
+ *  table.
+ *
+ *     Symbol.all_symbols.size    #=> 903
+ *     Symbol.all_symbols[1,20]   #=> [:floor, :ARGV, :Binding, :symlink,
+ *                                     :chown, :EOFError, :$;, :String,
+ *                                     :LOCK_SH, :"setuid?", :$<,
+ *                                     :default_proc, :compact, :extend,
+ *                                     :Tms, :getwd, :$=, :ThreadGroup,
+ *                                     :wait2, :$>]
+ */
+static mrb_value
+mrb_sym_all_symbols(mrb_state *mrb, mrb_value self)
+{
+  khiter_t k;
+  mrb_sym sym;
+  khash_t(n2s) *h = mrb->name2sym;
+  mrb_value ary = mrb_ary_new_capa(mrb, kh_size(h));
+
+  for (k = kh_begin(h); k != kh_end(h); k++) {
+    if (kh_exist(h, k)) {
+      sym = kh_value(h, k);
+      mrb_ary_push(mrb, ary, mrb_symbol_value(sym));
+    }
+  }
+
+  return ary;
+}
+
+void
+mrb_mruby_symbol_ext_gem_init(mrb_state* mrb)
+{
+  struct RClass *s = mrb->symbol_class;
+  mrb_define_class_method(mrb, s, "all_symbols", mrb_sym_all_symbols, ARGS_NONE());
+}
+
+void
+mrb_mruby_symbol_ext_gem_final(mrb_state* mrb)
+{
+}

mrbgems/mruby-symbol-ext/test/symbol.rb

@@ -0,0 +1,12 @@
+##
+# Symbol(Ext) Test
+
+assert('Symbol#to_proc') do
+  assert_equal :abs.to_proc[-5], 5
+end
+
+assert('Symbol.all_symbols') do
+  foo = [:__symbol_test_1, :__symbol_test_2, :__symbol_test_3].sort
+  symbols = Symbol.all_symbols.select{|sym|sym.to_s.include? '__symbol_test'}.sort
+  assert_equal symbols, foo
+end