Python version of BMS Parser core class (non-complete)

bmsreader.class.py

#!/usr/bin/python
# -*- coding: utf-8 -*-


import os, sys, math, cmath, hashlib, codecs

def md5_file(fname):
 md5ob = hashlib.md5()
 with open(fname,"rb") as f:
  for chunk in iter(lambda: f.read(8192), ""):
   md5ob.update(chunk)
 return md5ob.hexdigest()


def strstr(haystack, needle, b_needle = False):
 pos = haystack.find(needle)
 if pos < 0:
  return None
 else:
  if b_needle == True: 
   return haystack[:pos]
  else:
   return haystack[pos:]


class BMS_Reader:

 # Directives for basic information (metadatas)
 B_PLAYTYPE = "PLAYER" # Play mode
 B_MUSIC_GENRE="GENRE" # Genre of the music
 B_SCORE_TITLE="TITLE" # Title of the music
 B_MUSIC_ARTIST="ARTIST" # Artist name
 B_MUSIC_BPM="BPM" # BPM (beats per minute / Tempo)
 B_SCORE_LEVEL="PLAYLEVEL" # Playing Difficulty
 B_BRIEF_RANK="RANK" # Judge Level
 B_PARAM_TOTAL="TOTAL" # Gauge Totals
 B_MIXLEVEL="DIFFICULTY" # Display difficulty name
 B_DET_RANK="DEFEXRANK" # Judge Rank (detailed)
 B_BGMFILE="MIDIFILE" # Name of Background Music file
 B_VOLUME="VOLWAV" # Sound Volume

 # Maximum channel numbers
 SP5KEYS = 16 # Single Play (5 keys) / 11~15: Keys 1~5, 16: SC
 SP7KEYS = 19 # Single Play (7 keys) / 11~15: Keys 1~5, 16: SC, 18~19: Keys 6~7
 DP9KEYS = 25 # Double Play (9 keys) / 11~15: Keys 1~5, 22~25: Keys 6~9
 DP10KEYS = 26 # Double Play (10 keys) / 11~15: 1P Keys 1~5, 16: 1P SC, 21~25: 2P Keys 1~5, 26: 2P SC
 DP14KEYS = 29 # Double Play (14 keys) / 11~15: 1P Keys 1~5, 16: 1P SC, 18~19: 1P Keys 6~7, 21~25: 2P Keys 1~5, 26: 2P SC, 28~29: 2P Keys 6~7
 # for Long-notes
 LN_SP5KEYS = 56
 LN_SP7KEYS = 59
 LN_DP9KEYS = 65
 LN_DP10KEYS = 66
 LN_DP14KEYS = 69
 # Channel number for scratch notes
 SCR_LEFT = 16
 SCR_RIGHT = 26
 LN_SCR_LEFT = 56
 LN_SCR_RIGHT = 66


 mixlevels = {}
 mixlevels[1] = "Beginner"
 mixlevels[2] = "Normal"
 mixlevels[3] = "Hyper"
 mixlevels[4] = "Another"
 mixlevels[5] = "Insane"

 playtypes = {}
 playtypes[1] = "Single"
 playtypes[2] = "Two"
 playtypes[3] = "Double or 9-key"

 brief_ranks = ["Very Hard", "Hard", "Normal", "Easy"]
 
 def __init__(self, path):
  self.path = path
  #self.charset = charset
  self.handle = open(path,"r",encoding = "sjis")

 def parseMetadata(self):
  data = {}
  flagsfound = 0
  playtyped = False
  tpath = os.path.abspath(self.path)
  data["filepath"] = tpath.replace(os.pathsep,"/")
  data["path"] = os.path.dirname(data["filepath"])
  data["filename"] = os.path.basename(self.path)
  data["filesize"] = os.path.getsize(tpath)
  #data["filehash"] = md5_file(tpath)
  #parameter = ""
  self.handle.seek(0)
  for eachlines in self.handle.readlines():
   if eachlines[0] == "#":
    parameter = strstr(eachlines," ",True)
    print("b--"+str(eachlines[0]))
    parameter = parameter.replace("#","")
    print("a--"+str(parameter))
    parameter = parameter.upper()

    value = strstr(eachlines," ")
    value = value.strip()
   else:
    continue
   
   if parameter == self.B_PLAYTYPE:
    data["playtype_id"] = int(value)
    data["playtype_name"] = self.playtypes[int(value)]
    playtyped = True
   elif parameter == self.B_MUSIC_GENRE:
    data["genre"] = value
   elif parameter == self.B_SCORE_TITLE:
    data["title"] = value
   elif parameter == self.B_BGMFILE:
    data["bgmfile"] = value
   elif parameter == self.B_VOLUME:
    if value.isdight() == False or (value is None):
     data["volume"] = 100
    else:
     data["volume"] = float(value)
   elif parameter == self.B_MUSIC_BPM:
    data["bpm"] = float(value)
    if value.isdight() == False:
     data["bpm"] = 130
   elif parameter == self.B_SCORE_LEVEL:
    data["plevel"] = int(value)
   elif parameter == self.B_BRIEF_RANK:
    if (value is None) or value.isdight() == False:
     data["rank_id"] = 0
     data["rank_name"] = "Unknown"
    else:
     data["rank_id"] = int(value)
     data["rank_name"] = self.brief_ranks[int(value)]
   elif parameter == self.B_PARAM_TOTAL:
    data["total"] = int(value)
   elif parameter == self.B_MIXLEVEL:
    data["mixlevel"] = self.mixlevels[int(value)]
   elif parameter == self.B_DET_RANK:
    data["decrank"] = value
    
   if playtyped == False:
    del data
    data = {"error_code": 0x0F, "error_desc": "This file is not a valid BMS file!"}
    return data
   return data



example = BMS_Reader(os.path.abspath("example.bme"))
print(example.parseMetadata())