#

# All rights reserved.

# This component and the accompanying materials are made available

# under the terms of the License "Eclipse Public License v1.0"

# which accompanies this distribution, and is available

# at the URL "http://www.eclipse.org/legal/epl-v10.html".

#

# Initial Contributors:

# Nokia Corporation - initial contribution.

#

# Contributors:

#

# Description: 

#

# Python Script to create the vmap file for Binary Variation support in SBSv2

import sys

import os

import re

import subprocess

import tempfile

import traceback

from optparse import OptionParser

# the script will exit with 0 if there are no errors

global exitCode

exitCode = 0

# are we running on Windows?

onWindows = sys.platform.lower().startswith("win")

# error messages go to stderr

def error(format, *extras):

	sys.stderr.write("createvmap: error: " + (format % extras) + "\n")

	global exitCode

	exitCode = 1

# warning messages go to stderr

def warning(format, *extras):

	sys.stderr.write("createvmap: warning: " + (format % extras) + "\n")

# debug messages go to stderr

global printDebug

#

def debug(format, *extras):

	if printDebug:

		sys.stderr.write("createvmap: " + (format % extras) + "\n")

# Return a dictionary with the feature names and values from the preinclude file, by running cpp over the source

def getVmapMacros(aPreInclude, aPreprocessedFile=None, aCPP="cpp", aDefines="", aIncludes = ""):

	validmacros = {}

	# Run the pre-processor

	command = aCPP + " -include " + os.path.abspath(aPreInclude) + " -dU " + aDefines + aIncludes

	# Feed in the file to stdin, because we must set the stdin to something

	# other than the parent stdin anyway as that may not exist - for example

	# when using Talon.

	infile = open(aPreprocessedFile, "r")

	if onWindows:

		p = subprocess.Popen(command, bufsize=65535,

					                  stdin=infile,

					                  stdout=subprocess.PIPE,

					                  stderr=sys.stderr,

					                  universal_newlines=True)

	else:

		p = subprocess.Popen(command, bufsize=65535,

					                  stdin=infile,

					                  stdout=subprocess.PIPE,

					                  stderr=sys.stderr,

					                  close_fds=True, shell=True)

	stream = p.stdout

	# Parse the pre-processor output to look for -

	# lines "#define NAME VALUE" and "#undef NAME"

	defineRE = re.compile('^#define (?P<FEATURENAME>\w+)(\s+(?P<VALUE>\w+))?')

	undefRE = re.compile('^#undef (?P<FEATURENAME>\w+)')

	data = " "

	while data:

		data = stream.readline()

		definedmacro = defineRE.match(data)

		if definedmacro:

			name = definedmacro.group('FEATURENAME')

			value = definedmacro.group('VALUE')

			if value:

				validmacros[name] = value

			else:

				validmacros[name] = "defined"

		else:

			undefinedmacro = undefRE.match(data)

			if undefinedmacro:

				validmacros[undefinedmacro.group('FEATURENAME')] = "undefined"

	if p.wait() != 0:

		error("in command '%s'", command)

	infile.close()

	return validmacros

# Extract the features from a featurelist file

def getFeatures(aFeatureList):

	features = set()

	for f in aFeatureList:

		try:

			file = open(os.path.abspath(f),'r')

			for data in file.readlines():

				data = data.strip()

				features.add(data)

			file.close()

		except IOError:

			error("Feature list file %s not found", f)

	return sorted(list(features))

# Returns a dictionary of the features to be put in the vmap file

def getVariationFeatures(aFeatureList = [] ,aPreinclude = None,aPreprocessedFile = None,aCPP = "cpp",aDefines="",aIncludes = ""):

	variation_features = {'FEATURENAME':[],'VALUE':[]}

	macros = getVmapMacros(aPreinclude,aPreprocessedFile,aCPP,aDefines,aIncludes)

	# Co-relate the macros obtained from the pre-processor to the featurelist

	for f in aFeatureList:

		if f in macros:

			variation_features['FEATURENAME'].append(f)

			variation_features['VALUE'].append(macros[f])

	return variation_features

# Write to the vmap file, with the supplied dictionary containing the features

# The vmap path will be created if it doesn't exist

def createVmapFile(aMacroDictionary,aOutputfile):

	if not os.path.exists(os.path.dirname(aOutputfile)):

		os.makedirs(os.path.dirname(aOutputfile))

	try:

		vmapfile = open(aOutputfile,'w')

	except IOError:

		error("Cannot write to " + aOutputfile)

	i = 0

	while i < len(aMacroDictionary['FEATURENAME']):

		vmapfile.write(aMacroDictionary['FEATURENAME'][i]+"="+aMacroDictionary['VALUE'][i]+"\n")

		i += 1

	vmapfile.close()

def check_exists(thing, filenames):

	if not filenames:

		error("No %s specified", thing)

		return

	if not isinstance(filenames, list):

		# we just have a single string

		filenames = [filenames]

	for filename in filenames:

		if not os.path.exists(filename):

			error("The %s '%s' does not exist", thing, filename)

# Main function, creates the vmap file

def main():

	try:

		global exitCode, printDebug

		# any exceptions make us traceback and exit

		parser = OptionParser(prog = "createvmap.py")

		parser.add_option("-c","--cpploc",action="store",dest="cpplocation",help="Full path of the preprocessor")

		parser.add_option("-d","--debug",action="store_true",default=False,dest="debug",help="Turn debug information on")

		parser.add_option("-D","--define",action="append",dest="defines",help="Macro definition")

		parser.add_option("-f","--featurelist",action="append",dest="featurelistfile",help="List of featureslist files")

		parser.add_option("-o","--output",action="store",dest="outputvmapfile",help="Output VMAP file name")

		parser.add_option("-p","--preinclude",action="store",dest="preinclude",help="Pre-include file ")

		parser.add_option("-s","--source",action="append",dest="sourcefiles",help="List of source files")

		parser.add_option("-u","--userinc",action="append",dest="user_include",help="User Include Folders")

		parser.add_option("-x","--systeminc",action="append",dest="system_include",help="System Include Folders")

		if leftover_args:

			for invalids in leftover_args:

				warning("Unknown parameter '%s'" % invalids)

		printDebug = options.debug

		debug("Source Files     -> %s", options.sourcefiles)

		debug("Macro defines    -> %s", options.defines)

		debug("Features Files   -> %s", options.featurelistfile)

		debug("Pre-Include File -> %s", options.preinclude)

		debug("User Includes    -> %s", options.user_include)

		debug("System Includes  -> %s", options.system_include)

		debug("CPP Location     -> %s", options.cpplocation)

		debug("VMAP Output name -> %s", options.outputvmapfile)

		featurelist = []

		definelist = ""

		user_includeslist = ""

		system_includeslist = ""

		includeslist = ""

		# Some error checking code

		if not options.outputvmapfile:

			error("No output vmap file name supplied")

		# Source files must be supplied

		check_exists("source file", options.sourcefiles)

		# A valid preinclude file must be supplied

		check_exists("pre-include file", options.preinclude)

		# Some feature lists are required

		check_exists("feature list", options.featurelistfile)

		# A cpp tool is required

		check_exists("cpp tool", options.cpplocation)

		# if an essential option was missing then we should stop now

		if exitCode != 0:

			sys.exit(exitCode)

		# macro definitions

		if options.defines:

			for macro in options.defines:

				definelist += " -D" + macro.replace('__SBS__QUOTE__', '\\"')

		# Note that we have to use -isystem for user includes and system

		# includes to match what happens in the compiler. Long story.

		# Add each source directory as a user-include, so that our temporary

		# concatenated source file can find includes that were next to the

		# original source files.

		# Check that all the specified source files exist

		# and collect a set of all the source directories

		sourcedirs = set()

		for src in options.sourcefiles:

			sourcedirs.add(os.path.dirname(src))

		for srcdir in sourcedirs:

			user_includeslist += " -isystem " + srcdir

		# Convert the include list to a string to be passed to cpp

		if options.user_include:

			for userinc in options.user_include:

				user_includeslist += " -isystem " + userinc

		if options.system_include:

			for sysinc in options.system_include:

				system_includeslist += " -isystem " + sysinc

		includeslist = user_includeslist + system_includeslist

		# Get a list of all the features, from all the featurelist files

		featurelist = getFeatures(options.featurelistfile)

		# concatenate the source files together into a temporary file

		try:

			(tempfd, tempname) = tempfile.mkstemp()

			temp = os.fdopen(tempfd, "w")

			for src in options.sourcefiles:

				sfile = open(src, "r")

				for sline in sfile:

					temp.write(sline)

				sfile.close()

			temp.close()

		except Exception,e:

			error("Could not write source files into temporary file %s : %s" % (tempname, str(e)))

			return 1

		debug("Temporary file name : " + tempname)

		# extract the macros from the concatenated source files

		macro_dictionary = getVariationFeatures(featurelist,

		                                        options.preinclude,

								                tempname,

								                options.cpplocation,

								                definelist,

								                includeslist)

		debug("Macros extracted:") 

		for key,values in macro_dictionary.iteritems():

			debug(key + " " + str(values))

		# if there were no macros then the vmap file will be empty...

		if not macro_dictionary['FEATURENAME']:

			warning("No feature macros were found in the source")

		# Get rid of the temporary file

		try:

			os.remove(tempname)

		except:

			error("Could not delete temporary %s" % tempname) 

		createVmapFile(macro_dictionary, options.outputvmapfile)

		# exit with 0 if OK

		return exitCode

	except Exception,ex:

		traceback.print_exc()

		return 1

if __name__ == "__main__":

    sys.exit(main())