refactor symfile parser and add labels.json generator

extras/sym.py

@@ -1,25 +1,36 @@
-# -*- coding: utf-8 -*-
+# coding: utf-8
 
+import os
+import sys
 import json
 
-# from crystal import load_rom
-# from gbz80disasm import load_labels
-
 
 def make_sym_from_json(filename = '../pokecrystal.sym', j = 'labels.json'):
-	# todo: delete and remake labels.json at runtime
-	with open(filename, 'w') as sym:
-		for label in json.load(open(j)):
-			sym.write('{0:x}:{1:x} {2}\n'.format(label['bank'], label['address']%0x4000 + (0x4000 if label['bank'] else 0), label['label']))
-
-
-def make_sym_from_mapfile(filename = '../pokecrystal.sym', mapfile = '../mapfile.txt'):
-	# todo: sort label definitions by address
-	
 	output = ''
-	# get label definitions
-	with open(mapfile,'r') as map:
+	labels = json.load(open(j))
+	for label in labels:
+		output += '{0:x}:{1:x} {2}\n'.format(label['bank'], label['address'], label['label'])
+	with open(filename, 'w') as sym:
+		sym.write(output)
+
+
+def make_json_from_mapfile(filename = 'labels.json', mapfile = '../pokecrystal.map'):
+	output = []
+	labels = filter_wram_addresses(read_mapfile(mapfile))
+	with open(filename, 'w') as out:
+		out.write(json.dumps(labels))
+
+
+def read_mapfile(filename = '../pokecrystal.map'):
+	"""
+	Scrape label addresses from an rgbds mapfile.
+	"""
+
+	labels = []
+
+	with open(filename,'r') as map:
 		lines = map.readlines()
+
 	for line in lines:
 		# bank #
 		if 'Bank #' in line:
@@ -27,20 +38,51 @@ def make_sym_from_mapfile(filename = '../pokecrystal.sym', mapfile = '../mapfile
 
 		# label definition
 		elif '=' in line:
-				thing = line.split('=')
-				spacing = ' ' * 11 # arbitrary
-				addr = int(thing[0].lstrip(spacing)[1:5],16)
+			address, label = line.split('=')
+			address = int(address.lstrip().replace('$','0x'), 16)
+			label = label.strip()
 
-				# rgbds doesn't support wram banks yet,
-				# so this hack is applied instead
-				if addr > 0xbfff: # 0xc000+ (wram only)
-					cur_bank = 0
-				if addr > 0xcfff: # 0xd000+ (wram only)
-					cur_bank = 1
+			# rgbds doesn't support ram banks yet
+			bank = cur_bank
+			offset = address
+			if 0x8000 <= address < 0xa000:
+				bank = 0
+			elif 0xa000 <= address < 0xc000:
+				bank = 0
+			elif 0xc000 <= address < 0xd000:
+				bank = 0
+			elif 0xd000 <= address < 0xe000:
+				bank = 0
+			else:
+				offset += (bank * 0x4000 - 0x4000) if bank > 0 else 0
+
+			labels += [{
+				'label': label,
+				'bank': bank,
+				'address': offset,
+				'offset': offset,
+				'local_address': address,
+			}]
+
+	return labels
+
+def filter_wram_addresses(labels):
+	filtered_labels = []
+	for label in labels:
+		if label['local_address'] < 0x8000:
+			filtered_labels += [label]
+	return filtered_labels
+
+
+def make_sym_from_mapfile(filename = '../pokecrystal.sym'):
+	# todo: sort label definitions by address
+
+	output = ''
+	labels = read_mapfile()
 
 	# convert to sym format (bank:addr label)
-				label = thing[1].strip('\n')
-				output += hex(cur_bank)[2:] + ':' + hex(addr)[2:] + ' ' + label + '\n'
+	for label in labels:
+		output += '%.2x:%.4x %s\n' % (label['bank'], label['address'], label['label'])
 
 	# dump contents to symfile
 	with open(filename, 'w') as sym:
@@ -48,7 +90,11 @@ def make_sym_from_mapfile(filename = '../pokecrystal.sym', mapfile = '../mapfile
 
 
 if __name__ == "__main__":
-	# default behavior: generate sym file from rgbds mapfile
-	try: make_sym_from_mapfile()
-	# if no mapfile exists, generate from labels.json
-	except: make_sym_from_json()
+	#if os.path.exists('../pokecrystal.sym'):
+	#	sys.exit()
+	#elif os.path.exists('../pokecrystal.map'):
+	#	make_sym_from_mapfile()
+	#elif os.path.exists('labels.json'):
+	#	make_sym_from_json()
+	make_json_from_mapfile()
+