Rename `MRB_OPSYM()` to `MRB_QSYM()`.

Where `QSYM` means quoted symbols, which cannot be represented C
symbols, so specify aliases instead.

- operators: name of the operation, e.g. add for `+`
- predicates: add `_p` suffix instead of `?`
- bang methods: add `_b` suffix instead of `!`
- instance variables: add `a_` prefix instead of `@`
- global variables: add `d_` prefix instead of `@`
- class variables: unsupported; don't use them

Rakefile

@@ -173,13 +173,25 @@ file presym_inc => presym_file do
       "~" => "neg",
     }
     f.print "/* MRB_PRESYM_CSYM(sym, num) - symbol which is valid C id name */\n"
-    f.print "/* MRB_PRESYM_OPSYM(op, sym, num) - symbol which is an operator id */\n"
+    f.print "/* MRB_PRESYM_QSYM(sym, name, num) - symbol with alias name */\n"
     f.print "/* MRB_PRESYM_SYM(sym, num) - symbol which is not valid C id */\n\n"
     presyms.each.with_index do |sym,i|
       if /\A\w+\Z/ =~ sym
         f.print "MRB_PRESYM_CSYM(#{sym}, #{i+1})\n"
       elsif op_table.key?(sym)
-        f.print "MRB_PRESYM_OPSYM(#{sym}, #{op_table[sym]}, #{i+1})\n"
+        f.print "MRB_PRESYM_QSYM(#{sym}, #{op_table[sym]}, #{i+1})\n"
+      elsif /\?\Z/ =~ sym
+        s = sym.dup; s[-1] = "_p"
+        f.print "MRB_PRESYM_QSYM(#{sym}, #{s}, #{i+1})\n"
+      elsif /\!\Z/ =~ sym
+        s = sym.dup; s[-1] = "_b"
+        f.print "MRB_PRESYM_QSYM(#{sym}, #{s}, #{i+1})\n"
+      elsif /\A@/ =~ sym
+        s = sym.dup; s[0] = "a_"
+        f.print "MRB_PRESYM_QSYM(#{sym}, #{s}, #{i+1})\n"
+      elsif /\A$/ =~ sym
+        s = sym.dup; s[0] = "d_"
+        f.print "MRB_PRESYM_QSYM(#{sym}, #{s}, #{i+1})\n"
       else
         f.print "MRB_PRESYM_SYM(#{sym}, #{i+1})\n"
       end

include/mruby/presym.h

@@ -9,7 +9,7 @@
 
 #undef MRB_PRESYM_MAX
 #define MRB_PRESYM_CSYM(sym, num) MRB_PRESYM__##sym = (num<<1),
-#define MRB_PRESYM_OPSYM(op, sym, num) MRB_PRESYM_op_##sym = (num<<1),
+#define MRB_PRESYM_QSYM(src, sym, num) MRB_PRESYM_q_##sym = (num<<1),
 #define MRB_PRESYM_SYM(sym, num) 
 
 enum mruby_presym {
@@ -17,9 +17,9 @@ enum mruby_presym {
 };
 
 #undef MRB_PRESYM_CSYM
-#undef MRB_PRESYM_OPSYM
+#undef MRB_PRESYM_QSYM
 #undef MRB_PRESYM_SYM
 
 #define MRB_SYM(sym) MRB_PRESYM__##sym
-#define MRB_OPSYM(sym) MRB_PRESYM_op_##sym
+#define MRB_QSYM(sym) MRB_PRESYM_q_##sym
 #endif  /* MRUBY_PRESYM_H */

src/kernel.c

@@ -766,7 +766,7 @@ mrb_obj_ceqq(mrb_state *mrb, mrb_value self)
 {
   mrb_value v = mrb_get_arg1(mrb);
   mrb_int i, len;
-  mrb_sym eqq = MRB_OPSYM(eqq);
+  mrb_sym eqq = MRB_QSYM(eqq);
   mrb_value ary;
 
   if (mrb_array_p(self)) {

src/symbol.c

@@ -14,10 +14,10 @@
 
 #undef MRB_PRESYM_MAX
 #undef MRB_PRESYM_CSYM
-#undef MRB_PRESYM_OPSYM
+#undef MRB_PRESYM_QSYM
 #undef MRB_PRESYM_SYM
 #define MRB_PRESYM_CSYM(sym, num) #sym,
-#define MRB_PRESYM_OPSYM(op, sym, num) #op,
+#define MRB_PRESYM_QSYM(sym, name, num) #sym,
 #define MRB_PRESYM_SYM(sym, num) #sym,
 
 static const char *presym_table[] = {