#!/usr/bin/env python

from __future__ import print_function

import sys
import clang.cindex
import time
import os

if sys.platform == "darwin":
    clang.cindex.Config.set_library_file('/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/libclang.dylib')


structs = []

def build_struct(cursor):
    structs.append(cursor.spelling)
    print("template <class A, class B>\nvoid copy%s(A * dest, B * src)\n{" % cursor.spelling)
    for c in cursor.get_children():
        if c.kind == clang.cindex.CursorKind.FIELD_DECL:
            if c.type.get_array_size() > 0:
                if c.type.get_array_element_type().spelling in structs:
                    print("  for (int i=0; i<%d; i++) {" % c.type.get_array_size())
                    print("    copy%s(&dest->%s[i], &src->%s[i]);" % (c.type.get_array_element_type().spelling, c.spelling, c.spelling))
                    print("  }")
                else:
                    print("  memcpy(dest->%s, src->%s, sizeof(dest->%s));" % (c.spelling, c.spelling, c.spelling))
            elif c.type.get_declaration().spelling in structs:
                print("  copy%s(&dest->%s, &src->%s);" % (c.type.get_declaration().spelling, c.spelling, c.spelling))
            else:
                print("  dest->%s = src->%s;" % (c.spelling, c.spelling))
    print("}\n")

def build(cursor):
    result = []
    for c in cursor.get_children():
        if c.kind == clang.cindex.CursorKind.STRUCT_DECL:
            build_struct(c)
    return result


def header():
    print("//This file was auto-generated by %s script on %s. Do not edit this file!\n\n\n" % (os.path.basename(sys.argv[0]), time.asctime()))

index = clang.cindex.Index.create()
translation_unit = index.parse(sys.argv[1], ['-x', 'c++', '-std=c++11'] + sys.argv[2:])
header()
build(translation_unit.cursor)