import os, json

class JIS_automaton:
	def __init__(self, dict_path, init_mode=3):
		#0-XX ISO/IEC 646 IRV ('1b 28 42' で指定)
		#3-XXXX JIS X 0213:2004 平面 1 ('1b 24 28 51' で指定)
		#4-XXXX JIS X 0213:2000 平面 2 ('1b 24 28 50' で指定)
		self.mode = init_mode #初期モード
		self.two_byte_mode = True if init_mode > 0 else False
		self.charset_dict = dict()
		with open(dict_path, mode="r", encoding="utf-8") as fr:
			self.charset_dict = json.loads(fr.read())
	def change_mode(self, hex_list, pointer): #コードモード変更ポイント関数
		change_flag = True
		if len(hex_list[pointer:]) >= 3 and hex_list[pointer] == "1B" and hex_list[pointer+1] == "28" and hex_list[pointer+2] == "42": #0
			self.mode = 0
			plus_point = 3
		elif len(hex_list[pointer:]) >= 4 and hex_list[pointer] == "1B" and hex_list[pointer+1] == "24" and hex_list[pointer+2] == "28" and hex_list[pointer+2] == "51": #3
			self.mode = 3
			plus_point = 4
		elif len(hex_list[pointer:]) >= 4 and hex_list[pointer] == "1B" and hex_list[pointer+1] == "24" and hex_list[pointer+2] == "28" and hex_list[pointer+2] == "50": #4
			self.mode = 4
			plus_point = 4
		else:
			change_flag = False
			plus_point = 0
		return (change_flag, plus_point)
	def convert_unicode_to_char(self, unicode_one): #Unicode変換関数
		return chr(int(unicode_one.lstrip("U+"), 16))
	def scan(self, hex_list):
		pointer = 0
		return_list = list()
		while len(hex_list) > pointer:
			change_flag, plus_point = self.change_mode(hex_list, pointer)
			pointer += plus_point
			buffer = None
			if self.two_byte_mode:
				buffer = self.charset_dict["{0}/{1}{2}".format(self.mode, hex_list[pointer], hex_list[pointer+1])]["Unicode"]
				buffer = self.convert_unicode_to_char(buffer)
				pointer += 2
			else:
				buffer = self.charset_dict["{0}/{1}".format(self.mode, hex_list[pointer])]["Unicode"]
				buffer = self.convert_unicode_to_char(buffer)
				pointer += 1
			if buffer is not None:
				return_list.append(buffer)
		return return_list
	def scans(self, hex_text):
		return "".join(self.scan([hex_text[i:i+2] for i in range(0, len(hex_text), 2)]))

if "__main__" == __name__:
	os.chdir(os.path.dirname(os.path.abspath(__file__)))
	automaton = JIS_automaton("jis0208.json", init_mode=3) #http://charset.7jp.net/jis0208.html
	
	sample = "1B24423B64244F25512573254024472422246B21233A7B244B244F31494D5C242C4C35242421231B2842"
	#"私はパンダである。笹には栄養が無い。".encode("iso2022_jp_2004").hex().upper()
	
	sample = "BBE4A4CFA5D1A5F3A5C0A4C7A4A2A4EBA1A3BAFBA4CBA4CFB1C9CDDCA4ACCCB5A4A4A1A3"
	#"私はパンダである。笹には栄養が無い。".encode("euc_jis_2004").hex().upper()
	sample = "8E8482CD83708393835F82C582A082E981428DF982C982CD8968977B82AA96B382A28142"
	#"私はパンダである。笹には栄養が無い。".encode("shift-jis").hex().upper()
	sample = "9B4F82F18A538A5F8A9A82F382A082B181A08D6282F982F18B958C5182C98C5582A481A0"
	#JIS X 0208 で「私はパンダである。笹には栄養が無い。」
	
	print(len(sample))
	automaton.scans(sample)
	print("{0}: {1}".format(sample, automaton.scans(sample)))
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