CPreProcessor: extract macro names used in #if/#ifdef/#elif conditions as reference tags

An example session:

  $ cat /tmp/foo.c
  #ifdef FOO
  #elif defined(BAR)
  #endif

  $ ./ctags --sort=no --roles-C.'{macro}'='+{condition}' --extras=+r --fields=+r -o -  /tmp/foo.c
  FOO	/tmp/foo.c	/^#ifdef FOO$/;"	d	roles:condition
  BAR	/tmp/foo.c	/^#elif defined(BAR)$/;"	d	roles:condition

Signed-off-by: Masatake YAMATO <[email protected]>

Author: masatake

Tmain/kind-long.d/stdout-expected.txt

@@ -1,3 +1,3 @@
 L       label      yes     no      0      C      goto labels
 D       macroparam no      no      0      C      parameters inside macro definitions
-d       macro      no      no      1      C      macro definitions
+d       macro      no      no      2      C      macro definitions

Tmain/list-kinds-full.d/stdout-expected.txt

@@ -1,7 +1,7 @@
 #LETTER	NAME	ENABLED	REFONLY	NROLES	MASTER	DESCRIPTION
 D	macroparam	no	no	0	C	parameters inside macro definitions
 L	label	no	no	0	C	goto labels
-d	macro	yes	no	1	C	macro definitions
+d	macro	yes	no	2	C	macro definitions
 e	enumerator	yes	no	0	C	enumerators (values inside an enumeration)
 f	function	yes	no	0	C	function definitions
 g	enum	yes	no	0	C	enumeration names
@@ -23,7 +23,7 @@ N	name	no	no	0	NONE	names imported via using scope::symbol
 U	using	no	yes	0	NONE	using namespace statements
 Z	tparam	no	no	0	NONE	template parameters
 c	class	yes	no	0	NONE	classes
-d	macro	yes	no	1	C	macro definitions
+d	macro	yes	no	2	C	macro definitions
 e	enumerator	yes	no	0	C	enumerators (values inside an enumeration)
 f	function	yes	no	0	C	function definitions
 g	enum	yes	no	0	C	enumeration names

Tmain/list-roles-with-kind-names.d/stdout-expected.txt

@@ -43,25 +43,32 @@ Automake       d/directory ltlibrary on      directory for LTLIBRARIES primary
 Automake       d/directory man       on      directory for MANS primary
 Automake       d/directory program   on      directory for PROGRAMS primary
 Automake       d/directory script    on      directory for SCRIPTS primary
+C              d/macro     condition off     used in part of #if/#ifdef/#elif conditions
 C              d/macro     undef     on      undefined
 C              h/header    local     on      local header
 C              h/header    system    on      system header
+C++            d/macro     condition off     used in part of #if/#ifdef/#elif conditions
 C++            d/macro     undef     on      undefined
 C++            h/header    local     on      local header
 C++            h/header    system    on      system header
+CPreProcessor  d/macro     condition off     used in part of #if/#ifdef/#elif conditions
 CPreProcessor  d/macro     undef     on      undefined
 CPreProcessor  h/header    local     on      local header
 CPreProcessor  h/header    system    on      system header
+CUDA           d/macro     condition off     used in part of #if/#ifdef/#elif conditions
 CUDA           d/macro     undef     on      undefined
 CUDA           h/header    local     on      local header
 CUDA           h/header    system    on      system header
 M4             d/macro     undef     on      undefined
+OldC           d/macro     condition off     used in part of #if/#ifdef/#elif conditions
 OldC           d/macro     undef     on      undefined
 OldC           h/header    local     on      local header
 OldC           h/header    system    on      system header
+OldC++         d/macro     condition off     used in part of #if/#ifdef/#elif conditions
 OldC++         d/macro     undef     on      undefined
 OldC++         h/header    local     on      local header
 OldC++         h/header    system    on      system header
+Vera           d/macro     condition off     used in part of #if/#ifdef/#elif conditions
 Vera           d/macro     undef     on      undefined
 Vera           h/header    local     on      local header
 Vera           h/header    system    on      system header