generate-gamepad-mappings

#!/usr/bin/env python2.7

import argparse
import json


def get_max_size(val):
	return {
		'head': 4,
		'axes': 13,
		'button': 45
	}.get(val, 0)


def get_key_name(val):
	return {
		'b': 'button',
		'a': 'axes',
		'h': 'head'
	}.get(val, val)


def get_button_name(name):
	return {
		"dpup": "up",
		"dpright": "right",
		"dpleft": "left",
		"dpdown": "down",
		"lefty": "leftStickY",
		"righty": "rightStickY",
		"leftx": "leftStickX",
		"rightx": "rightStickX",
		"righttrigger": "rightTrigger",
		"leftshoulder": "leftBumper",
		"rightshoulder": "rightBumper",
		"rightstick": "rightStick",
		"lefttrigger": "leftTrigger",
		"leftstick": "leftStick"
	}.get(name, name)


def save(filename, data):
	with open(filename, 'w') as file_:
		file_.write(data)


def change_endian(hexString):
	return ''.join(sum([(c,d,a,b) for a,b,c,d in zip(*[iter(hexString)]*4)], ()))


def parse_file(filePath, resPath):
	with open(filePath) as f:
		content = f.readlines()
		result = {}

		platform = ""
		for line in content:
			line = line.strip(" \t\r\n")

			if len(line) == 0:
				continue

			if line[0] == '#': # skip OS lines
				platform = line[2:]
				continue

			tokens = line.split(',')
			if len(tokens) <= 1:
				continue

			gamepad = {}
			vendor = tokens[0][:16]
			product = tokens[0][16:32]
			if platform.lower() == "linux":
				vendor = str(int(change_endian(vendor)[8:12], 16))
				product = str(int(change_endian(product)[8:12], 16))
			else:
				vendor = str(int(change_endian(vendor)[0:4], 16))
				product = str(int(change_endian(product)[0:4], 16))
			id = vendor + ":" + product

			gamepad['name'] = tokens[1]
			gamepad['mapping'] = {}
			gamepad['mapping']['button'] = [0] * 45	# 45 - max button number
			gamepad['mapping']['axes'] = [0] * 13	# 13 - max axes count
			max_button = 0
			max_axes = 0
			for t in tokens:
				if len(t) == 0:
					continue

				item = t.split(':')
				if len(item) <= 1 or item[0] == "platform" or len(item[0]) == 0 or len(item[1]) == 0:
					continue

				key = get_key_name(item[1][0])
				if key == "head":
					continue

				val = get_button_name(item[0])
				idx = int(item[1][1:])
				gamepad['mapping'][key][idx] = val
				if key == "button":
					if max_button < idx:
						max_button = idx
				elif key == "axes":
					if max_axes < idx:
						max_axes = idx

			gamepad['mapping']['button'] = gamepad['mapping']['button'][:max_button + 1] if max_button > 0 else []
			gamepad['mapping']['axes'] = gamepad['mapping']['axes'][:max_axes + 1] if max_axes > 0 else []

			result[id] = gamepad
			save(resPath, json.dumps(result, sort_keys=True))


if __name__ == '__main__':
	parser = argparse.ArgumentParser()

	# input file example
	# https://raw.githubusercontent.com/gabomdq/SDL_GameControllerDB/master/gamecontrollerdb.txt
	parser.add_argument('file')
	parser.add_argument('output')
	args = parser.parse_args()
	parse_file(args.file, args.output)