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#!/usr/bin/env python
# encoding: utf-8
from __future__ import print_function

copyright = '''
//    Copyright © 2014 Ben Longbons <b.r.longbons@gmail.com>
//
//    This file is part of The Mana World (Athena server)
//
//    This program is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.
//
//    This program is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with this program.  If not, see <http://www.gnu.org/licenses/>.
'''

import glob
import itertools
import os
import subprocess
import sys
import tempfile

import protocol

error = False

def eprint(s):
    print('Error:', s, file=sys.stderr)

def get_classes_from_file(a):
    global error
    d = {}
    execfile(a, d)
    for (k, v) in sorted(d.items()):
        try:
            name = v.name
        except AttributeError:
            if hasattr(v, 'enabled') and hasattr(v, 'tests'):
                name = 'None::' + k
            else:
                continue
        else:
            if name.split('::')[-1] != k:
                eprint('Mismatch: class %s is for %s' % (k, name))
                error = True
        if not v.enabled:
            eprint('Disabled: %s' % name)
            continue

        try:
            tests = v.tests
        except AttributeError:
            eprint('Unimplemented tests for %s' % name)
            error = True
            continue
        extra = getattr(v, 'test_extra', '').rstrip(' ')
        yield (k, tests, extra)

def c_quote(s):
    s = s.replace('\\', '\\\\')
    s = s.replace('"', '\\"')
    return '"' + s + '"'

def gen_test(name, expr, expected, w):
    print('static', file=w)
    print('void %s()' % name, file=w)
    print('{', file=w)
    print('    auto value = %s;' % expr, file=w)
    print('    const char *expected = %s;' % c_quote(expected), file=w)
    print('    do_breakpoint(value, expected);', file=w)
    print('}', file=w)

def main(args):
    outdir = args[0]
    args = args[1:]

    for g in glob.glob(os.path.join(outdir, '*.[ch]pp')):
        os.rename(g, g + '.old')

    for a in args:
        names = []
        basename, ext = os.path.splitext(a)
        assert ext == '.py'
        newbase = basename.split('src/')[1].replace('/', '-')
        out = os.path.join(outdir, newbase + '.cpp')
        with protocol.OpenWrite(out) as w:
            print('// %s.cpp - generated by' % newbase, __file__, file=w)
            print(copyright, file=w)
            print('#include <cstdio>', file=w)
            print('// just mention "fwd.hpp" and "../poison.hpp" to make formatter happy', file=w)
            print('namespace tmwa', file=w)
            print('{', file=w)
            print('} // namespace tmwa', file=w)
            print(file=w)
            print('template<class T>', file=w)
            print('__attribute__((noinline))', file=w)
            print('void do_breakpoint(const T& value, const char *expected)', file=w)
            print('{', file=w)
            print('    (void)value;', file=w)
            print('    (void)expected;', file=w)
            print('    if (!expected) printf("printer test: %p = %s\\n", &value, expected);', file=w)
            print('}', file=w)
            print(file=w)
            print('// Tests from', a, file=w)
            header = basename + '.hpp'
            print('#include "%s"' % header, file=w)

            for (k, tests, extra) in get_classes_from_file(a):
                print(file=w)
                print('// Tests for', k, file=w)
                print(extra, file=w)
                for (i, (expr, expected)) in enumerate(tests):
                    name = 'testset_%s_subtest_%d' % (k, i)
                    gen_test(name, expr, expected, w)
                    names.append(name)
            print('int main()', file=w)
            print('{', file=w)
            for n in names:
                print('    %s();' % n, file=w)
            print('}', file=w)

    for g in glob.glob(os.path.join(outdir, '*.old')):
        print('Obsolete: %s' % g)
        os.remove(g)

    if error and not os.getenv('TMWA_FORCE_GENERATE'):
        sys.exit(1)


if __name__ == '__main__':
    main(sys.argv[1:])