add regex for bool parsing & test struct w/ bool parsing (#169)

GitHub: fix GH-168

Struct parsing invokes "parse_ctype" on the whole member signature,
which fails if member type is "bool" due to plain string matching for
it. This change updates "bool" type matching to a regexp, so TYPE_BOOL
is correctly parsed for a whole signature like "bool toggle" as well as
just "bool".

---------

Co-authored-by: Sutou Kouhei <kou@cozmixng.org>

lib/fiddle/cparser.rb

@@ -247,7 +247,7 @@ def parse_ctype(ty, tymap=nil)
         return TYPE_INTPTR_T
       when /\Auintptr_t(?:\s+\w+)?\z/
         return TYPE_UINTPTR_T
-      when "bool"
+      when /\Abool(?:\s+\w+)?\z/
         return TYPE_BOOL
       when /\*/, /\[[\s\d]*\]/
         return TYPE_VOIDP

test/fiddle/test_cparser.rb

@@ -277,6 +277,11 @@ def test_struct_string
       assert_equal [[TYPE_INT,TYPE_VOIDP,TYPE_VOIDP], ['x', 'cb', 'name']], parse_struct_signature('int x; void (*cb)(); const char* name')
     end
 
+    def test_struct_bool
+      assert_equal([[TYPE_INT, TYPE_BOOL], ['x', 'toggle']],
+                   parse_struct_signature('int x; bool toggle'))
+    end
+
     def test_struct_undefined
       assert_raise(DLError) { parse_struct_signature(['int i', 'DWORD cb']) }
     end