Expose API for retrieving event names

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 178 insertions, 0 deletions

diff --git a/libevdev/make-event-names.py b/libevdev/make-event-names.py
new file mode 100755
index 0000000..62dcf7f
--- /dev/null
+++ b/libevdev/make-event-names.py
@@ -0,0 +1,178 @@
+#!/usr/bin/env python
+# Parses linux/input.h scanning for #define KEY_FOO 134
+# Prints a C header file or a Python file that can be used as
+# mapping table
+#
+
+import re
+import sys
+import argparse
+
+SOURCE_FILE = "/usr/include/linux/input.h"
+
+class Bits(object):
+	pass
+
+prefixes = [
+		"EV_",
+		"REL_",
+		"ABS_",
+		"KEY_",
+		"BTN_",
+		"LED_",
+		"SND_",
+		"MSC_",
+		"SW_",
+		"FF_",
+		"SYN_",
+		"INPUT_PROP_",
+]
+
+blacklist = [
+		"EV_VERSION"
+]
+
+def print_bits(bits, prefix):
+	if  not hasattr(bits, prefix):
+		return
+	print "static const char * const %s_map[%s_MAX + 1] = {" % (prefix, prefix.upper())
+	print "	[0 ... %s_MAX] = NULL," % prefix.upper()
+	for val, name in getattr(bits, prefix).items():
+		print "	[%s] = \"%s\"," % (name, name)
+	print "};"
+	print ""
+
+def print_python_bits(bits, prefix):
+	if  not hasattr(bits, prefix):
+		return
+
+	print "%s_map = {" % (prefix)
+	for val, name in getattr(bits, prefix).items():
+		print "	%d : \"%s\"," % (val, name)
+	print "}"
+	print "for k, v in %s_map.items():" % (prefix)
+	print "	%s_map[v] = k" % (prefix)
+	print ""
+
+def print_map(bits):
+	print "static const char * const * const event_type_map[EV_MAX + 1] = {"
+	print "	[0 ... EV_MAX] = NULL,"
+
+	for prefix in prefixes:
+		if prefix == "BTN_" or prefix == "EV_" or prefix == "INPUT_PROP_":
+			continue
+		print "	[EV_%s] = %s_map," % (prefix[:-1], prefix[:-1].lower())
+
+	print "};"
+	print ""
+
+	print "static const int ev_max[EV_MAX + 1] = {"
+	for prefix in prefixes:
+		if prefix == "BTN_" or prefix == "EV_" or prefix == "INPUT_PROP_":
+			continue
+		print "	[EV_%s] = %s_MAX," % (prefix[:-1], prefix[:-1])
+	print "};"
+	print ""
+
+def print_python_map(bits):
+	print "map = {"
+
+	for val, name in getattr(bits, "ev").items():
+		name = name[3:]
+		if name == "REP" or name == "PWR"  or name == "FF_STATUS"  or name == "MAX":
+			continue
+		print "	%d : %s_map," % (val, name.lower())
+
+	print "}"
+	print ""
+
+def print_mapping_table(bits):
+	print "/* THIS FILE IS GENERATED, DO NOT EDIT */"
+	print ""
+	print "#ifndef EVENT_NAMES_H"
+	print "#define EVENT_NAMES_H"
+	print ""
+	print "#define SYN_MAX 3 /* linux/input.h doesn't define that */"
+	print ""
+
+	for prefix in prefixes:
+		if prefix == "BTN_":
+			continue
+		print_bits(bits, prefix[:-1].lower())
+
+	print_map(bits)
+
+	print "#endif /* EVENT_NAMES_H */"
+
+def print_python_mapping_table(bits):
+	print "# THIS FILE IS GENERATED, DO NOT EDIT"
+	print ""
+
+	for prefix in prefixes:
+		if prefix == "BTN_":
+			continue
+		print_python_bits(bits, prefix[:-1].lower())
+
+	print_python_map(bits)
+
+	print "def event_get_type_name(type):"
+	print "	return ev_map[type]"
+	print ""
+	print ""
+	print "def event_get_code_name(type, code):"
+	print "	if map.has_key(type) and map[type].has_key(code):"
+	print "		return map[type][code]"
+	print "	return 'UNKNOWN'"
+	print ""
+
+def parse_define(bits, line):
+	m = re.match(r"^#define\s+(\w+)\s+(\w+)", line)
+	if m == None:
+		return
+
+	name = m.group(1)
+
+	if name in blacklist:
+		return
+
+	try:
+		value = int(m.group(2), 0)
+	except ValueError:
+		return
+
+	for prefix in prefixes:
+		if not name.startswith(prefix):
+			continue
+
+		attrname = prefix[:-1].lower()
+		if attrname == "btn":
+			attrname = "key"
+
+		if not hasattr(bits, attrname):
+			setattr(bits, attrname, {})
+		b = getattr(bits, attrname)
+		b[value] = name
+
+def parse(path):
+	fp = open(path)
+
+	bits = Bits()
+
+	lines = fp.readlines()
+	for line in lines:
+		if not line.startswith("#define"):
+			continue
+		parse_define(bits, line)
+
+	return bits
+
+if __name__ == "__main__":
+	bits = parse(SOURCE_FILE)
+	parser = argparse.ArgumentParser()
+	parser.add_argument("--output", default="c")
+
+	args = parser.parse_args(sys.argv[1:])
+	if args.output == "python":
+		print_python_mapping_table(bits)
+	else:
+		print_mapping_table(bits)