#!/usr/bin/env python

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

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

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, "rt")
	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)
	else:
		print "ignoring " + pragma

def do_preprogs_src ():
	global current_file
	current_file = []
	append_file ("preprogs.src")
	preprogs = current_file
	for p in preprogs:
		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':
				parse_pragma (arg1, margs)
			elif directive == 'includelist':
				fname = parse_filename (arg1)
				if fname:
					source_list.append (fname)
			elif directive == 'endlist':
				pass
			else:
				print "ignoring " + p
		else:
			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
	current_file = []
	output = []
	condition = [1]
	append_file (source_file)
	i = 0
	while i < len (current_file):
		l = current_file[i]
		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, "wt")
		for l in output:
			f.write(l + '\n')
		f.close ()

no_delete = 0
i = 0
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
	i = i + 1
do_preprogs_src ()
for s in source_list:
	if s[0]=='#':
		continue		# preprocessor directive
	process_source (s)
f = open (progs_src, "wt")
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
args = ["qfcc"] + args
if not os.fork():
	os.execvp ("qfcc", args)
else:
	os.wait()
if not no_delete:
	for l in qcc_list:
		os.unlink (l)
	os.unlink (progs_src)