[PATCH] keymap-gen: add support for generating output for C++

[Peter Korsgaard <peter korsgaard com>]

Designated initializers ([index] = value,) are not available in C++:

https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html

So add a custom stdc++ output format which outputs all array entries instead
of the "sparse" C variant.

Signed-off-by: Peter Korsgaard <peter korsgaard com>
---
A gitlab pull request was sent ~1 month ago, without any feedback:

https://gitlab.com/keycodemap/keycodemapdb/merge_requests/2

So trying here instead.

 tools/keymap-gen | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tools/keymap-gen b/tools/keymap-gen
index a10c538..914b40c 100755
--- a/tools/keymap-gen
+++ b/tools/keymap-gen
@@ -493,11 +493,31 @@ class CLanguageGenerator(LanguageSrcGenerator):
         if value is not None:
             print("  [0x%x] = \"%s\", /* %s */" % (index, value, comment))
 
+class CppLanguageGenerator(CLanguageGenerator):
+
+    # designated initializers not available in C++
+    def _array_entry_code(self, index, value, comment):
+        if value is not None:
+            print("  0x%x, /* %s */" % (value, comment))
+        else:
+            print("  0, /* %s */" % comment)
+
+    def _array_entry_name(self, index, value, comment):
+        if value is not None:
+            print("  \"%s\", /* %s */" % (value, comment))
+        else:
+            print("  0, /* %s */" % comment)
+
 class StdCLanguageGenerator(CLanguageGenerator):
 
     def __init__(self):
         super(StdCLanguageGenerator, self).__init__("unsigned short", "char *")
 
+class StdCppLanguageGenerator(CppLanguageGenerator):
+
+    def __init__(self):
+        super(StdCppLanguageGenerator, self).__init__("unsigned short", "char *")
+
 class GLib2LanguageGenerator(CLanguageGenerator):
 
     def __init__(self):
@@ -603,6 +623,7 @@ class PodLanguageGenerator(LanguageDocGenerator):
 
 SRC_GENERATORS = {
     "stdc": StdCLanguageGenerator(),
+    "stdc++": StdCppLanguageGenerator(),
     "glib2": GLib2LanguageGenerator(),
     "python2": PythonLanguageGenerator(),
     "python3": PythonLanguageGenerator(),
-- 
2.11.0