add symfile generation

extras/sym.py

@@ -0,0 +1,54 @@
+# -*- coding: utf-8 -*-
+
+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']&0x3fff, 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:
+		lines = map.readlines()
+		for line in lines:
+			# bank #
+			if 'Bank #' in line:
+				cur_bank = int(line.lstrip('Bank #').strip(':\n').strip(' (HOME)'))
+			
+			# label definition
+			elif '=' in line:
+				thing = line.split('=')
+				spacing = ' ' * 11 # arbitrary
+				addr = int(thing[0].lstrip(spacing)[1:5],16)
+				
+				# 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
+				
+				# convert to sym format (bank:addr label)
+				label = thing[1].strip('\n')
+				output += hex(cur_bank)[2:] + ':' + hex(addr)[2:] + ' ' + label + '\n'
+	
+	# dump contents to symfile
+	with open(filename, 'w') as sym:
+		sym.write(output)
+
+
+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()