make a basic python module

1 files changed, 54 insertions, 0 deletions

diff --git a/pokemontools/sym.py b/pokemontools/sym.py
new file mode 100644
index 0000000..f78b9af
--- /dev/null
+++ b/pokemontools/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']%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:
+        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()