#!/usr/bin/env python

import os
import re
import sys
import string
from pprint import *

#os.sapn*p* hack
#swiped from Alexey Borzenkov snaury at gmail.com 
if (not (hasattr(os, 'spawnvpe') or hasattr(os, 'spawnvp'))
    and hasattr(os, 'spawnve') and hasattr(os, 'spawnv')):
    def _os__spawnvpe(mode, file, args, env=None):
        import sys
        from errno import ENOENT, ENOTDIR
        from os import path, spawnve, spawnv, environ, defpath, pathsep, error

        if env is not None:
            func = spawnve
            argrest = (args, env)
        else:
            func = spawnv
            argrest = (args,)
            env = environ

        head, tail = path.split(file)
        if head:
            return func(mode, file, *argrest)
        if 'PATH' in env:
            envpath = env['PATH']
        else:
            envpath = defpath
        PATH = envpath.split(pathsep)
        if os.name == 'nt' or os.name == 'os2':
            PATH.insert(0, '')
        saved_exc = None
        saved_tb = None
        for dir in PATH:
            fullname = path.join(dir, file)
            try:
                return func(mode, fullname, *argrest)
            except error, e:
                tb = sys.exc_info()[2]
                if (e.errno != ENOENT and e.errno != ENOTDIR
                    and saved_exc is None):
                    saved_exc = e
                    saved_tb = tb
        if saved_exc:
            raise error, saved_exc, saved_tb
        raise error, e, tb

    def _os_spawnvp(mode, file, args):
        return os._spawnvpe(mode, file, args)

    def _os_spawnvpe(mode, file, args, env):
        return os._spawnvpe(mode, file, args, env)

    def _os_spawnlp(mode, file, *args):
        return os._spawnvpe(mode, file, args)

    def _os_spawnlpe(mode, file, *args):
        return os._spawnvpe(mode, file, args[:-1], args[-1])

    os._spawnvpe = _os__spawnvpe
    os.spawnvp = _os_spawnvp
    os.spawnvpe = _os_spawnvpe
    os.spawnlp = _os_spawnlp
    os.spawnlpe = _os_spawnlpe
    os.__all__.extend(["spawnvp", "spawnvpe", "spawnlp", "spawnlpe"])
#end os.sapn*p* hack

string_re = re.compile (r'"(\\.|[^"\\])*"')
comment_whole = re.compile (r'((/\*.*\*/)|//.*)')
comment_start = re.compile (r'(/\*.*)')
comment_end = re.compile (r'(.*\*/)')
directive_re = re.compile (
    r'^\s*#\s*(define|undef|include|includelist|endlist|ifdef|ifndef|endif|else|pragma|[0-9]+)\b' +
    r'((\s*("[^"]*"|[^ \t\n\r\f\v/]+|/(?!/))+)?)' +
    r'((\s*("[^"]*"|[^ \t\n\r\f\v/]+|/(?!/))+)*)')
macro_re = re.compile (r'#([A-Za-z_][0-9A-Za-z_]*)')
arg_re = re.compile (
    r'((\s*("[^"]*"|[^ \t\n\r\f\v/]+|/(?!/))+)?)' +
    r'((\s*("[^"]*"|[^ \t\n\r\f\v/]+|/(?!/))+)*)')

current_file = []
source_list = []
qcc_list = []
defines = {}
progs_dat = "progs.dat"
progs_src = "progs.src"
compile_this_file = 1
keep_newlines = 1
check_redefines = 1
verbose = 0

def append_file (filename):
	global current_file
	f = open (filename, "rb")
	lines = f.readlines ()
	f.close ()
	current_file.append ('# 1 "' + filename + '"')
	for i in range (len (lines)):
		lines[i] = string.rstrip (lines[i])
	current_file = current_file + lines

def parse_filename (args):
	m = arg_re.match (args)
	fname = string.strip (m.groups()[0])
	if fname:
		if fname[0] == '"':
			fname = fname[1:]
		if fname[-1] == '"':
			fname = fname[:-1]
	return fname

def parse_pragma (pragma, args):
	global progs_dat, progs_dat
	global compile_this_file, keep_newlines, check_redefines
	if pragma == 'PROGS_DAT':
		progs_dat = parse_filename (args)
	elif pragma == 'PROGS_SRC':
		progs_src = parse_filename (args)
	elif pragma == 'DONT_COMPILE_THIS_FILE':
		compile_this_file = 0
	elif pragma == 'COMPILE_THIS_FILE':
		compile_this_file = 1
	elif pragma == 'KEEP_NEWLINES':
		keep_newlines = parse_on_off (args)
	elif pragma == 'CHECK_REDEFINES':
		check_redefines = parse_on_off (args)
	elif pragma == 'CHECK_UNUSED_ON':
		pass
	elif pragma == 'CHECK_UNUSED_OFF':
		pass
	else:
		print "ignoring " + pragma

def comment_string (string_list, start, end):
	i = 0
	while i < len (string_list):
		if start <= string_list[i][1] and end >= string_list[i][2]:
			del string_list[i]
			continue
		i += 1
	return string_list

def parse_strings_and_comments (l, incomment):
	#print source_file + ":" + `i` + ":" + l
	string_list = []
	s = string_re.search (l)
	while s:
		string_list.append ((l[s.start():s.end()], s.start(), s.end()))
		l = l[:s.start()] + ((s.end() - s.start()) * ' ') + l[s.end():]
		s = string_re.search (l)
	if incomment:
		s = comment_end.search (l)
		if s:
			l = (s.end() * ' ') + l[s.end():]
			incomment = 0
			string_list = comment_string (string_list, s.start(), s.end())
		else:
			string_list = comment_string (string_list, 0, len(l))
			l = ""
	s = comment_whole.search (l)
	if s:
		l = l[:s.start()] + ((s.end() - s.start()) * ' ') + l[s.end():]
		string_list = comment_string (string_list, s.start(), s.end())
	s = comment_start.search (l)
	if s:
		l = l[:s.start()] + ((s.end() - s.start()) * ' ')
		string_list = comment_string (string_list, s.start(), s.end())
		incomment = 1
	for str in string_list:
		l = l[:str[1]] + str[0] + l[str[2]:]
	#print l
	return l, incomment

def do_preprogs_src ():
	global current_file
	current_file = []
	condition = [1]
	incomment = 0
	append_file ("preprogs.src")
	preprogs = current_file
	for p in preprogs:
		p, incomment = parse_strings_and_comments (p, incomment)
		m = directive_re.match (p)
		if (m):
			g = m.groups()
			directive = g[0]
			arg1 = string.strip (g[1])
			margs = string.strip (g[4])
			#pprint ((directive, arg1, margs))
			if directive == 'pragma':
				if condition[-1]:
					parse_pragma (arg1, margs)
			elif directive[0] in '0123456789':
				pass
			elif directive == 'includelist':
				if condition[-1]:
					fname = parse_filename (arg1)
					if fname:
						source_list.append (fname)
			elif directive == 'endlist':
				pass
			elif directive == 'ifdef':
				condition.append (condition[-1])
				if not defines.has_key (arg1):
					condition[-1]=0
			elif directive == 'ifndef':
				condition.append (condition[-1])
				if defines.has_key (arg1):
					condition[-1]=0
			elif directive == 'else':
				condition[-1] = condition [-2] and not condition[-1]
			elif directive == 'endif':
				del condition[-1]
			else:
				if condition[-1]:
					print "ignoring " + p
		else:
			if condition[-1]:
				fname = parse_filename (p)
				if fname:
					source_list.append (fname)
				
def include_file (fname):
	global current_file
	fname = parse_filename (fname)
	if fname:
		append_file (fname)

def process_source (source_file):
	global compile_this_file, current_file
	if verbose:
		print source_file
	compile_this_file = 1
	includelist = 0
	incomment = 0
	current_file = []
	output = []
	condition = [1]
	append_file (source_file)
	i = 0
	while i < len (current_file):
		l = current_file[i]
		l, incomment = parse_strings_and_comments (l, incomment)
		m = directive_re.match (l)
		if (m):
			g = m.groups()
			directive = g[0]
			arg1 = string.strip (g[1])
			margs = string.strip (g[4])
			#pprint ((directive, arg1, margs))
			if directive == 'pragma':
				if condition[-1]:
					parse_pragma (arg1, margs)
			elif directive == 'include':
				if condition[-1]:
					include_file (arg1)
			elif directive == 'includelist':
				if condition[-1]:
					include_file (arg1)
					includelist = 1
			elif directive == 'endlist':
				if condition[-1]:
					includelist = 0
			elif directive == 'define':
				if condition[-1]:
					defines[arg1] = margs
			elif directive == 'undef':
				if condition[-1]:
					if defines.has_key (arg1):
						del defines[arg1]
			elif directive == 'ifdef':
				condition.append (condition[-1])
				if not defines.has_key (arg1):
					condition[-1]=0
			elif directive == 'ifndef':
				condition.append (condition[-1])
				if defines.has_key (arg1):
					condition[-1]=0
			elif directive == 'else':
				condition[-1] = condition [-2] and not condition[-1]
			elif directive == 'endif':
				del condition[-1]
			else:
				if condition[-1]:
					print "ignoring " + l
			output.append ('//' + l)
		else:
			if (includelist):
				fname = parse_filename (l)
				if fname:
					include_file (fname)
				output.append ('//' + l)
			else:
				if not condition[-1]:
					l = '//##' + l
				else:
					s = macro_re.search (l)
					while s:
						id = s.groups()[0]
						if defines.has_key (id):
							l = (l[:s.start()]
							     + defines[id]
							     + l[s.end():])
							s = macro_re.search (l)
						else:
							s = macro_re.search (l,
								s.start(1))
				output.append (l)
		i = i + 1
	if compile_this_file:
		fname = source_file + '.pqc'
		qcc_list.append (fname)
		f = open (fname, "wb")
		for l in output:
			f.write(l + '\n')
		f.close ()

no_delete = 0
use_cpp = 0
i = 0
qfcc_prefix = ""	# search the path
while i < len (sys.argv):
	if sys.argv[i] == '--keep':
		no_delete = 1
		del sys.argv[i]
		continue
	elif sys.argv[i] == '--verbose':
		verbose = 1
		del sys.argv[i]
		continue
	elif sys.argv[i] == '--cpp':
		use_cpp = 1
		del sys.argv[i]
		continue
	elif sys.argv[i] == '--local-qfcc':
		qfcc_prefix = "./"	# search the local directory
		del sys.argv[i]
		continue
	i = i + 1
do_preprogs_src ()
progs_dat = source_list[0]
source_list = source_list[1:]
for s in source_list:
	process_source (s)
f = open (progs_src, "wb")
f.write (progs_dat + '\n\n')
for l in qcc_list:
	f.write(l + '\n')
f.close ()
args = sys.argv[1:]
if not verbose:
	args = ["--quiet"] + args
if not use_cpp:
	args = ["-C", "no-cpp"] + args
args = [qfcc_prefix + "qfcc"] + args
err = os.spawnvp (os.P_WAIT, qfcc_prefix + "qfcc", args)
if not no_delete:
	for l in qcc_list:
		os.unlink (l)
	os.unlink (progs_src)
if err == 127:
	print "Could not execute qfcc. Ensure qfcc is either in a directory in"
	print "$PATH, or in the current directory and run qfpreqcc with",
	print "\"--local-qfcc\"."