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# ScummVM - Graphic Adventure Engine
#
# ScummVM is the legal property of its developers, whose names
# are too numerous to list here. Please refer to the COPYRIGHT
# file distributed with this source distribution.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
import os, re
from proc import proc
import lex
import op
class parser:
def __init__(self):
self.strip_path = 0
self.__globals = {}
self.__offsets = {}
self.__stack = []
self.proc = None
self.proc_list = []
self.binary_data = []
self.symbols = []
self.link_later = []
def visible(self):
for i in self.__stack:
if not i or i == 0:
return False
return True
def push_if(self, text):
value = self.eval(text)
#print "if %s -> %s" %(text, value)
self.__stack.append(value)
def push_else(self):
#print "else"
self.__stack[-1] = not self.__stack[-1]
def pop_if(self):
#print "endif"
return self.__stack.pop()
def set_global(self, name, value):
if len(name) == 0:
raise Exception("empty name is not allowed")
name = name.lower()
#print "adding global %s -> %s" %(name, value)
if self.__globals.has_key(name):
raise Exception("global %s was already defined", name)
self.__globals[name] = value
def get_global(self, name):
name = name.lower()
g = self.__globals[name]
g.used = True
return g
def get_globals(self):
return self.__globals
def has_global(self, name):
name = name.lower()
return self.__globals.has_key(name)
def set_offset(self, name, value):
if len(name) == 0:
raise Exception("empty name is not allowed")
name = name.lower()
#print "adding global %s -> %s" %(name, value)
if self.__offsets.has_key(name):
raise Exception("global %s was already defined", name)
self.__offsets[name] = value
def get_offset(self, name):
name = name.lower()
return self.__offsets[name]
def include(self, basedir, fname):
path = fname.split('\\')[self.strip_path:]
path = os.path.join(basedir, os.path.pathsep.join(path))
#print "including %s" %(path)
self.parse(path)
def eval(self, stmt):
try:
return self.parse_int(stmt)
except:
pass
value = self.__globals[stmt.lower()].value
return int(value)
def expr_callback(self, match):
name = match.group(1).lower()
g = self.get_global(name)
if isinstance(g, op.const):
return g.value
else:
return "0x%04x" %g.offset
def eval_expr(self, expr):
n = 1
while n > 0:
expr, n = re.subn(r'\b([a-zA-Z_]+[a-zA-Z0-9_]*)', self.expr_callback, expr)
return eval(expr)
def expand_globals(self, text):
return text
def fix_dollar(self, v):
print("$ = %d" %len(self.binary_data))
return re.sub(r'\$', "%d" %len(self.binary_data), v)
def parse_int(self, v):
if re.match(r'[01]+b$', v):
v = int(v[:-1], 2)
if re.match(r'[\+-]?[0-9a-f]+h$', v):
v = int(v[:-1], 16)
return int(v)
def compact_data(self, width, data):
#print "COMPACTING %d %s" %(width, data)
r = []
base = 0x100 if width == 1 else 0x10000
for v in data:
if v[0] == '"':
if v[-1] != '"':
raise Exception("invalid string %s" %v)
if width == 2:
raise Exception("string with data width more than 1") #we could allow it :)
for i in xrange(1, len(v) - 1):
r.append(ord(v[i]))
continue
m = re.match(r'(\w+)\s+dup\s+\((\s*\S+\s*)\)', v)
if m is not None:
#we should parse that
n = self.parse_int(m.group(1))
if m.group(2) != '?':
value = self.parse_int(m.group(2))
else:
value = 0
for i in xrange(0, n):
v = value
for b in xrange(0, width):
r.append(v & 0xff);
v >>= 8
continue
try:
v = self.parse_int(v)
if v < 0:
v += base
except:
#global name
print "global/expr: %s" %v
try:
g = self.get_global(v)
v = g.offset
except:
print "unknown address %s" %(v)
self.link_later.append((len(self.binary_data) + len(r), v))
v = 0
for b in xrange(0, width):
r.append(v & 0xff);
v >>= 8
#print r
return r
def parse(self, fname):
# print "opening file %s..." %(fname, basedir)
fd = open(fname, 'rb')
for line in fd:
line = line.strip()
if len(line) == 0 or line[0] == ';' or line[0] == chr(0x1a):
continue
#print line
m = re.match('(\w+)\s*?:', line)
if m is not None:
line = line[len(m.group(0)):].strip()
if self.visible():
name = m.group(1)
if self.proc is not None:
self.proc.add_label(name)
print "offset %s -> %d" %(name, len(self.binary_data))
self.set_offset(name, (len(self.binary_data), self.proc, len(self.proc.stmts) if self.proc is not None else 0))
#print line
cmd = line.split()
if len(cmd) == 0:
continue
cmd0 = str(cmd[0])
if cmd0 == 'if':
self.push_if(cmd[1])
continue
elif cmd0 == 'else':
self.push_else()
continue
elif cmd0 == 'endif':
self.pop_if()
continue
if not self.visible():
continue
if cmd0 == 'db' or cmd0 == 'dw' or cmd0 == 'dd':
arg = line[len(cmd0):].strip()
print "%d:1: %s" %(len(self.binary_data), arg) #fixme: COPYPASTE
binary_width = {'b': 1, 'w': 2, 'd': 4}[cmd0[1]]
self.binary_data += self.compact_data(binary_width, lex.parse_args(arg))
continue
elif cmd0 == 'include':
self.include(os.path.dirname(fname), cmd[1])
continue
elif cmd0 == 'endp':
self.proc = None
continue
elif cmd0 == 'assume':
print "skipping: %s" %line
continue
elif cmd0 == 'rep':
self.proc.add(cmd0)
self.proc.add(" ".join(cmd[1:]))
continue
if len(cmd) >= 3:
cmd1 = cmd[1]
if cmd1 == 'equ':
v = cmd[2]
self.set_global(cmd0, op.const(self.fix_dollar(v)))
elif cmd1 == 'db' or cmd1 == 'dw' or cmd1 == 'dd':
binary_width = {'b': 1, 'w': 2, 'd': 4}[cmd1[1]]
offset = len(self.binary_data)
arg = line[len(cmd0):].strip()
arg = arg[len(cmd1):].strip()
print "%d: %s" %(offset, arg)
self.binary_data += self.compact_data(binary_width, lex.parse_args(arg))
self.set_global(cmd0.lower(), op.var(binary_width, offset))
continue
elif cmd1 == 'proc':
name = cmd0.lower()
self.proc = proc(name)
print "procedure %s, #%d" %(name, len(self.proc_list))
self.proc_list.append(name)
self.set_global(name, self.proc)
continue
if (self.proc):
self.proc.add(line)
else:
#print line
pass
fd.close()
return self
def link(self):
for addr, expr in self.link_later:
v = self.eval_expr(expr)
print "link: patching %04x -> %04x" %(addr, v)
while v != 0:
self.binary_data[addr] = v & 0xff
addr += 1
v >>= 8
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