#!/usr/bin/env python

# This Source Code Form is subject to the terms of the Mozilla Public

# License, v. 2.0. If a copy of the MPL was not distributed with this

# file, You can obtain one at http://mozilla.org/MPL/2.0/.

# This script processes NSS .def files according to the rules defined in

# a comment at the top of each one. The files are used to define the

# exports from NSS shared libraries, with -DEFFILE on Windows, a linker

# script on Linux, or with -exported_symbols_list on OS X.

#

# The NSS build system processes them using a series of sed replacements,

# but the Mozilla build system is already running a Python script to generate

# the file so it's simpler to just do the replacement in Python.

#

# One difference between the NSS build system and Mozilla's is that

# Mozilla's supports building on Linux for Windows using MinGW. MinGW

# expects all lines containing ;+ removed and all ;- tokens removed.

import buildconfig

def main(output, input):

    is_darwin = buildconfig.substs['OS_ARCH'] == 'Darwin'

    is_mingw = "WINNT" == buildconfig.substs['OS_ARCH'] and buildconfig.substs['GCC_USE_GNU_LD']

    with open(input, 'rb') as f:

        for line in f:

            line = line.rstrip()

            # On everything except MinGW, remove all lines containing ';-'

            if not is_mingw and ';-' in line:

                continue

            # On OS X, remove all lines containing ';+'

            if is_darwin and ';+' in line:

                continue

            # Remove the string ' DATA '.

            line = line.replace(' DATA ', '')

            # Remove the string ';+'

            if not is_mingw:

                line = line.replace(';+', '')

            # Remove the string ';;'

            line = line.replace(';;', '')

            # If a ';' is present, remove everything after it,

            # and on OS X, remove it as well.

            i = line.find(';')

            if i != -1:

                if is_darwin or is_mingw:

                    line = line[:i]

                else:

                    line = line[:i+1]

            # On OS X, symbols get an underscore in front.

            if line and is_darwin:

                output.write('_')

            output.write(line)

            output.write('\n')