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preprocessor.py
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preprocessor.py
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class Context:
def __init__(self, visited_files=None, defines=None):
self.visited_files = visited_files if visited_files is not None else []
self.defines = defines if defines is not None else {}
self.if_stacks = [True]
def last_if(self):
return self.if_stacks[-1]
def end_if(self):
self.if_stacks = self.if_stacks[:-1]
def if_def(self, val):
self.if_stacks.append(val in self.defines)
def if_ndef(self, val):
self.if_stacks.append(val not in self.defines)
def if_else(self):
v = not self.last_if()
self.end_if()
self.if_stacks.append(v)
def define(self, name, value, file_name, line, col, func_data):
self.defines[name] = value, (file_name, line, col), func_data
def preprocess(data,file_name="[unknown]", context=None):
if context is None:
context = Context([file_name], {})
line_map = {}
current_line = 1
result = ""
for i, line in enumerate(data.split("\n")):
if line.strip().startswith("#"):
pre_chars, line = line.index("#"), line.strip()
item = line.split(" ")[0][1:]
args = line.split(" ")[1:]
if item == "endif":
context.end_if()
elif item == "else":
context.if_else()
if context.last_if():
if item == "include":
included_file_name = args[0][1:-1]
context.visited_files.append(included_file_name)
try:
included_file_data = open(included_file_name, "r").read()
except FileNotFoundError:
print("Unable to read file '%s'" % included_file_name)
included_file_data = ""
processed, included_line_map, _ = preprocess(included_file_data, included_file_name, context)
result += processed + "\n"
for key in included_line_map.keys():
line_map[key - 1 + current_line] = included_line_map[key]
current_line += len(processed.split("\n")) - 1
elif item == "define":
title = args[0]
i = 1
if "(" in title:
while not ")" in title:
title += " " + args[i]
i += 1
value = " ".join(args[i:])
func_data = None
if "(" in title:
func_data = [item.strip() for item in title.split("(")[1].split(")")[0].split(",")]
context.define(title.split("(")[0], value, file_name, i, pre_chars + 9 + len(args[0]), func_data)
elif item == "undef":
if args[0] in context.defines:
del context.defines[args[0]]
elif item == "ifdef":
context.if_def(args[0])
elif item == "ifndef":
context.if_ndef(args[0])
else:
if context.last_if():
result += line + "\n"
line_map[current_line] = (i + 1, file_name)
current_line += 1
return result, line_map, context