_ Git - ldk-java/blob - genbindings.py

   1 #!/usr/bin/env python3
   2 import sys, re
   3
   4 if len(sys.argv) < 7:
   5     print("USAGE: /path/to/lightning.h /path/to/bindings/output /path/to/bindings/ /path/to/bindings/output.c debug lang")
   6     sys.exit(1)
   7
   8 if sys.argv[5] == "false":
   9     DEBUG = False
  10 elif sys.argv[5] == "true":
  11     DEBUG = True
  12 else:
  13     print("debug should be true or false and indicates whether to track allocations and ensure we don't leak")
  14     sys.exit(1)
  15
  16 target = None
  17 if sys.argv[6] == "java":
  18     from java_strings import Consts
  19 elif sys.argv[6] == "typescript":
  20     import typescript_strings
  21     from typescript_strings import Consts
  22     target = typescript_strings.Target.NODEJS
  23     if len(sys.argv) == 8 and sys.argv[7] == 'browser':
  24         target = typescript_strings.Target.BROWSER
  25 else:
  26     print("Only java or typescript can be set for lang")
  27     sys.exit(1)
  28
  29
  30 consts = Consts(DEBUG, target=target)
  31
  32 from bindingstypes import *
  33
  34 c_file = ""
  35 def write_c(s):
  36     global c_file
  37     c_file += s
  38
  39 def camel_to_snake(s):
  40     # Convert camel case to snake case, in a way that appears to match cbindgen
  41     con = "_"
  42     ret = ""
  43     lastchar = ""
  44     lastund = False
  45     for char in s:
  46         if lastchar.isupper():
  47             if not char.isupper() and not lastund:
  48                 ret = ret + "_"
  49                 lastund = True
  50             else:
  51                 lastund = False
  52             ret = ret + lastchar.lower()
  53         else:
  54             ret = ret + lastchar
  55             if char.isupper() and not lastund:
  56                 ret = ret + "_"
  57                 lastund = True
  58             else:
  59                 lastund = False
  60         lastchar = char
  61         if char.isnumeric():
  62             lastund = True
  63     return (ret + lastchar.lower()).strip("_")
  64
  65 unitary_enums = set()
  66 complex_enums = set()
  67 opaque_structs = set()
  68 trait_structs = set()
  69 result_types = set()
  70 tuple_types = {}
  71
  72 var_is_arr_regex = re.compile("\(\*([A-za-z0-9_]*)\)\[([a-z0-9]*)\]")
  73 var_ty_regex = re.compile("([A-za-z_0-9]*)(.*)")
  74 java_c_types_none_allowed = True # Unset when we do the real pass that populates the above sets
  75 def java_c_types(fn_arg, ret_arr_len):
  76     fn_arg = fn_arg.strip()
  77     if fn_arg.startswith("MUST_USE_RES "):
  78         fn_arg = fn_arg[13:]
  79     is_const = False
  80     if fn_arg.startswith("const "):
  81         fn_arg = fn_arg[6:]
  82         is_const = True
  83     if fn_arg.startswith("struct "):
  84         fn_arg = fn_arg[7:]
  85     if fn_arg.startswith("enum "):
  86         fn_arg = fn_arg[5:]
  87     fn_arg = fn_arg.replace("NONNULL_PTR", "")
  88
  89     is_ptr = False
  90     take_by_ptr = False
  91     rust_obj = None
  92     arr_access = None
  93     java_hu_ty = None
  94     if fn_arg.startswith("LDKThirtyTwoBytes"):
  95         fn_arg = "uint8_t (*" + fn_arg[18:] + ")[32]"
  96         assert var_is_arr_regex.match(fn_arg[8:])
  97         rust_obj = "LDKThirtyTwoBytes"
  98         arr_access = "data"
  99     elif fn_arg.startswith("LDKPublicKey"):
 100         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[33]"
 101         assert var_is_arr_regex.match(fn_arg[8:])
 102         rust_obj = "LDKPublicKey"
 103         arr_access = "compressed_form"
 104     elif fn_arg.startswith("LDKSecretKey"):
 105         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[32]"
 106         assert var_is_arr_regex.match(fn_arg[8:])
 107         rust_obj = "LDKSecretKey"
 108         arr_access = "bytes"
 109     elif fn_arg.startswith("LDKSignature"):
 110         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[64]"
 111         assert var_is_arr_regex.match(fn_arg[8:])
 112         rust_obj = "LDKSignature"
 113         arr_access = "compact_form"
 114     elif fn_arg.startswith("LDKThreeBytes"):
 115         fn_arg = "uint8_t (*" + fn_arg[14:] + ")[3]"
 116         assert var_is_arr_regex.match(fn_arg[8:])
 117         rust_obj = "LDKThreeBytes"
 118         arr_access = "data"
 119     elif fn_arg.startswith("LDKFourBytes"):
 120         fn_arg = "uint8_t (*" + fn_arg[13:] + ")[4]"
 121         assert var_is_arr_regex.match(fn_arg[8:])
 122         rust_obj = "LDKFourBytes"
 123         arr_access = "data"
 124     elif fn_arg.startswith("LDKSixteenBytes"):
 125         fn_arg = "uint8_t (*" + fn_arg[16:] + ")[16]"
 126         assert var_is_arr_regex.match(fn_arg[8:])
 127         rust_obj = "LDKSixteenBytes"
 128         arr_access = "data"
 129     elif fn_arg.startswith("LDKTenBytes"):
 130         fn_arg = "uint8_t (*" + fn_arg[12:] + ")[10]"
 131         assert var_is_arr_regex.match(fn_arg[8:])
 132         rust_obj = "LDKTenBytes"
 133         arr_access = "data"
 134     elif fn_arg.startswith("LDKu8slice"):
 135         fn_arg = "uint8_t (*" + fn_arg[11:] + ")[datalen]"
 136         assert var_is_arr_regex.match(fn_arg[8:])
 137         rust_obj = "LDKu8slice"
 138         arr_access = "data"
 139     elif fn_arg.startswith("LDKCVec_u8Z"):
 140         fn_arg = "uint8_t (*" + fn_arg[12:] + ")[datalen]"
 141         rust_obj = "LDKCVec_u8Z"
 142         assert var_is_arr_regex.match(fn_arg[8:])
 143         arr_access = "data"
 144     elif fn_arg.startswith("LDKTransaction"):
 145         fn_arg = "uint8_t (*" + fn_arg[15:] + ")[datalen]"
 146         rust_obj = "LDKTransaction"
 147         assert var_is_arr_regex.match(fn_arg[8:])
 148         arr_access = "data"
 149     elif fn_arg.startswith("LDKCVec_"):
 150         is_ptr = False
 151         if "*" in fn_arg:
 152             fn_arg = fn_arg.replace("*", "")
 153             is_ptr = True
 154
 155         tyn = fn_arg[8:].split(" ")
 156         assert tyn[0].endswith("Z")
 157         if tyn[0] == "u64Z":
 158             new_arg = "uint64_t"
 159         else:
 160             new_arg = "LDK" + tyn[0][:-1]
 161         for a in tyn[1:]:
 162             new_arg = new_arg + " " + a
 163         res = java_c_types(new_arg, ret_arr_len)
 164         if res is None:
 165             assert java_c_types_none_allowed
 166             return None
 167         if is_ptr:
 168             res.pass_by_ref = True
 169         if res.is_native_primitive or res.passed_as_ptr:
 170             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 171                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty=res.c_ty + "Array", passed_as_ptr=False, is_ptr=is_ptr, is_const=is_const,
 172                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 173         else:
 174             return TypeInfo(rust_obj=fn_arg.split(" ")[0], java_ty=res.java_ty + "[]", java_hu_ty=res.java_hu_ty + "[]",
 175                 java_fn_ty_arg="[" + res.java_fn_ty_arg, c_ty=consts.ptr_arr, passed_as_ptr=False, is_ptr=is_ptr, is_const=is_const,
 176                 var_name=res.var_name, arr_len="datalen", arr_access="data", subty=res, is_native_primitive=False)
 177
 178     is_primitive = False
 179     arr_len = None
 180     mapped_type = []
 181     java_type_plural = None
 182     if fn_arg.startswith("void"):
 183         java_ty = "void"
 184         c_ty = "void"
 185         fn_ty_arg = "V"
 186         fn_arg = fn_arg[4:].strip()
 187         is_primitive = True
 188     elif fn_arg.startswith("bool"):
 189         java_ty = "boolean"
 190         c_ty = "jboolean"
 191         fn_ty_arg = "Z"
 192         fn_arg = fn_arg[4:].strip()
 193         is_primitive = True
 194     elif fn_arg.startswith("uint8_t"):
 195         mapped_type = consts.c_type_map['uint8_t']
 196         java_ty = mapped_type[0]
 197         c_ty = "int8_t"
 198         fn_ty_arg = "B"
 199         fn_arg = fn_arg[7:].strip()
 200         is_primitive = True
 201     elif fn_arg.startswith("uint16_t"):
 202         mapped_type = consts.c_type_map['uint16_t']
 203         java_ty = mapped_type[0]
 204         c_ty = "int16_t"
 205         fn_ty_arg = "S"
 206         fn_arg = fn_arg[8:].strip()
 207         is_primitive = True
 208     elif fn_arg.startswith("uint32_t"):
 209         mapped_type = consts.c_type_map['uint32_t']
 210         java_ty = mapped_type[0]
 211         c_ty = "int32_t"
 212         fn_ty_arg = "I"
 213         fn_arg = fn_arg[8:].strip()
 214         is_primitive = True
 215     elif fn_arg.startswith("uint64_t") or fn_arg.startswith("uintptr_t"):
 216         # TODO: uintptr_t is arch-dependent :(
 217         mapped_type = consts.c_type_map['uint64_t']
 218         java_ty = mapped_type[0]
 219         fn_ty_arg = "J"
 220         if fn_arg.startswith("uint64_t"):
 221             c_ty = "int64_t"
 222             fn_arg = fn_arg[8:].strip()
 223         else:
 224             c_ty = "intptr_t"
 225             fn_arg = fn_arg[9:].strip()
 226         is_primitive = True
 227     elif is_const and fn_arg.startswith("char *"):
 228         java_ty = "String"
 229         c_ty = "const char*"
 230         fn_ty_arg = "Ljava/lang/String;"
 231         fn_arg = fn_arg[6:].strip()
 232     elif fn_arg.startswith("LDKStr"):
 233         java_ty = "String"
 234         c_ty = "jstring"
 235         fn_ty_arg = "Ljava/lang/String;"
 236         fn_arg = fn_arg[6:].strip()
 237         arr_access = "chars"
 238         arr_len = "len"
 239     else:
 240         ma = var_ty_regex.match(fn_arg)
 241         if ma.group(1).strip() in unitary_enums:
 242             java_ty = ma.group(1).strip()
 243             c_ty = consts.result_c_ty
 244             fn_ty_arg = "Lorg/ldk/enums/" + ma.group(1).strip() + ";"
 245             fn_arg = ma.group(2).strip()
 246             rust_obj = ma.group(1).strip()
 247         elif ma.group(1).strip().startswith("LDKC2Tuple"):
 248             c_ty = consts.ptr_c_ty
 249             java_ty = consts.ptr_native_ty
 250             java_hu_ty = "TwoTuple<"
 251             if not ma.group(1).strip() in tuple_types:
 252                 assert java_c_types_none_allowed
 253                 return None
 254             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 255                 if idx != 0:
 256                     java_hu_ty = java_hu_ty + ", "
 257                 if ty_info.is_native_primitive:
 258                     if ty_info.java_hu_ty == "int":
 259                         java_hu_ty = java_hu_ty + "Integer" # Java concrete integer type is Integer, not Int
 260                     else:
 261                         java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 262                 else:
 263                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 264             java_hu_ty = java_hu_ty + ">"
 265             fn_ty_arg = "J"
 266             fn_arg = ma.group(2).strip()
 267             rust_obj = ma.group(1).strip()
 268             take_by_ptr = True
 269         elif ma.group(1).strip().startswith("LDKC3Tuple"):
 270             c_ty = consts.ptr_c_ty
 271             java_ty = consts.ptr_native_ty
 272             java_hu_ty = "ThreeTuple<"
 273             if not ma.group(1).strip() in tuple_types:
 274                 assert java_c_types_none_allowed
 275                 return None
 276             for idx, ty_info in enumerate(tuple_types[ma.group(1).strip()][0]):
 277                 if idx != 0:
 278                     java_hu_ty = java_hu_ty + ", "
 279                 if ty_info.is_native_primitive:
 280                     if ty_info.java_hu_ty == "int":
 281                         java_hu_ty = java_hu_ty + "Integer" # Java concrete integer type is Integer, not Int
 282                     else:
 283                         java_hu_ty = java_hu_ty + ty_info.java_hu_ty.title() # If we're a primitive, capitalize the first letter
 284                 else:
 285                     java_hu_ty = java_hu_ty + ty_info.java_hu_ty
 286             java_hu_ty = java_hu_ty + ">"
 287             fn_ty_arg = "J"
 288             fn_arg = ma.group(2).strip()
 289             rust_obj = ma.group(1).strip()
 290             take_by_ptr = True
 291         else:
 292             c_ty = consts.ptr_c_ty
 293             java_ty = consts.ptr_native_ty
 294             java_hu_ty = ma.group(1).strip().replace("LDKCResult", "Result").replace("LDK", "")
 295             fn_ty_arg = "J"
 296             fn_arg = ma.group(2).strip()
 297             rust_obj = ma.group(1).strip()
 298             take_by_ptr = True
 299
 300     if fn_arg.startswith(" *") or fn_arg.startswith("*"):
 301         fn_arg = fn_arg.replace("*", "").strip()
 302         is_ptr = True
 303         c_ty = consts.ptr_c_ty
 304         java_ty = consts.ptr_native_ty
 305         fn_ty_arg = "J"
 306         is_primitive = False
 307
 308     var_is_arr = var_is_arr_regex.match(fn_arg)
 309     if var_is_arr is not None or ret_arr_len is not None:
 310         assert(not take_by_ptr)
 311         assert(not is_ptr)
 312         # is there a special case for plurals?
 313         if len(mapped_type) == 2:
 314             java_ty = mapped_type[1]
 315         else:
 316             java_ty = java_ty + "[]"
 317         c_ty = c_ty + "Array"
 318         if var_is_arr is not None:
 319             if var_is_arr.group(1) == "":
 320                 return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_hu_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty, is_const=is_const,
 321                     passed_as_ptr=False, is_ptr=False, var_name="arg", arr_len=var_is_arr.group(2), arr_access=arr_access, is_native_primitive=False)
 322             return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_hu_ty=java_ty, java_fn_ty_arg="[" + fn_ty_arg, c_ty=c_ty, is_const=is_const,
 323                 passed_as_ptr=False, is_ptr=False, var_name=var_is_arr.group(1), arr_len=var_is_arr.group(2), arr_access=arr_access, is_native_primitive=False)
 324
 325     if java_hu_ty is None:
 326         java_hu_ty = java_ty
 327     return TypeInfo(rust_obj=rust_obj, java_ty=java_ty, java_hu_ty=java_hu_ty, java_fn_ty_arg=fn_ty_arg, c_ty=c_ty, passed_as_ptr=is_ptr or take_by_ptr,
 328         is_const=is_const, is_ptr=is_ptr, var_name=fn_arg, arr_len=arr_len, arr_access=arr_access, is_native_primitive=is_primitive)
 329
 330 fn_ptr_regex = re.compile("^extern const ([A-Za-z_0-9\* ]*) \(\*(.*)\)\((.*)\);$")
 331 fn_ret_arr_regex = re.compile("(.*) \(\*(.*)\((.*)\)\)\[([0-9]*)\];$")
 332 reg_fn_regex = re.compile("([A-Za-z_0-9\* ]* \*?)([a-zA-Z_0-9]*)\((.*)\);$")
 333 clone_fns = set()
 334 constructor_fns = {}
 335
 336 from gen_type_mapping import TypeMappingGenerator
 337 type_mapping_generator = TypeMappingGenerator(java_c_types, consts, opaque_structs, clone_fns, unitary_enums, trait_structs, complex_enums, result_types, tuple_types)
 338
 339 with open(sys.argv[1]) as in_h:
 340     for line in in_h:
 341         reg_fn = reg_fn_regex.match(line)
 342         if reg_fn is not None:
 343             if reg_fn.group(2).endswith("_clone"):
 344                 clone_fns.add(reg_fn.group(2))
 345             else:
 346                 rty = java_c_types(reg_fn.group(1), None)
 347                 if rty is not None and rty.rust_obj is not None and reg_fn.group(2) == rty.java_hu_ty + "_new":
 348                     constructor_fns[rty.rust_obj] = reg_fn.group(3)
 349             continue
 350         arr_fn = fn_ret_arr_regex.match(line)
 351         if arr_fn is not None:
 352             if arr_fn.group(2).endswith("_clone"):
 353                 clone_fns.add(arr_fn.group(2))
 354             # No object constructors return arrays, as then they wouldn't be an object constructor
 355             continue
 356
 357 # Define some manual clones...
 358 clone_fns.add("ThirtyTwoBytes_clone")
 359 write_c("static inline struct LDKThirtyTwoBytes ThirtyTwoBytes_clone(const struct LDKThirtyTwoBytes *orig) { struct LDKThirtyTwoBytes ret; memcpy(ret.data, orig->data, 32); return ret; }\n")
 360
 361 java_c_types_none_allowed = False # C structs created by cbindgen are declared in dependency order
 362
 363 with open(sys.argv[1]) as in_h, open(sys.argv[2], "w") as out_java:
 364
 365     # Map a top-level function
 366     def map_fn(line, re_match, ret_arr_len, c_call_string):
 367
 368         # PARSING START
 369         method_return_type = re_match.group(1)
 370         method_name = re_match.group(2)
 371         method_comma_separated_arguments = re_match.group(3)
 372         method_arguments = method_comma_separated_arguments.split(',')
 373
 374         is_free = method_name.endswith("_free")
 375         struct_meth = method_name.split("_")[0]
 376
 377         return_type_info = type_mapping_generator.map_type(method_return_type, True, ret_arr_len, False, False)
 378
 379         argument_types = []
 380         default_constructor_args = {}
 381         takes_self = False
 382         args_known = True
 383
 384         for argument_index, argument in enumerate(method_arguments):
 385             argument_conversion_info = type_mapping_generator.map_type(argument, False, None, is_free, True)
 386             if argument_index == 0 and argument_conversion_info.java_hu_ty == struct_meth:
 387                 takes_self = True
 388             if argument_conversion_info.arg_conv is not None and "Warning" in argument_conversion_info.arg_conv:
 389                 if argument_conversion_info.rust_obj in constructor_fns:
 390                     assert not is_free
 391                     for explode_arg in constructor_fns[argument_conversion_info.rust_obj].split(','):
 392                         explode_arg_conv = type_mapping_generator.map_type(explode_arg, False, None, False, True)
 393                         if explode_arg_conv.c_ty == "void":
 394                             # We actually want to handle this case, but for now its only used in NetGraphMsgHandler::new()
 395                             # which ends up resulting in a redundant constructor - both without arguments for the NetworkGraph.
 396                             args_known = False
 397                             pass
 398                         if not argument_conversion_info.arg_name in default_constructor_args:
 399                             default_constructor_args[argument_conversion_info.arg_name] = []
 400                         default_constructor_args[argument_conversion_info.arg_name].append(explode_arg_conv)
 401             argument_types.append(argument_conversion_info)
 402
 403         has_out_java_struct = ("LDK" + struct_meth in opaque_structs or "LDK" + struct_meth in trait_structs) and not is_free
 404         # PARSING END
 405
 406         out_java.write("\t// " + line)
 407
 408         (out_java_delta, out_c_delta, out_java_struct_delta) = consts.map_function(argument_types, c_call_string, is_free, method_name, return_type_info, struct_meth, default_constructor_args, takes_self, args_known, has_out_java_struct, type_mapping_generator)
 409
 410         out_java.write(out_java_delta)
 411         write_c(out_c_delta)
 412
 413         if has_out_java_struct:
 414             out_java_struct = open(f"{sys.argv[3]}/structs/{struct_meth}{consts.file_ext}", "a")
 415             out_java_struct.write(out_java_struct_delta)
 416
 417
 418
 419
 420
 421     def map_unitary_enum(struct_name, field_lines):
 422         with open(f"{sys.argv[3]}/enums/{struct_name}{consts.file_ext}", "w") as out_java_enum:
 423             unitary_enums.add(struct_name)
 424             for idx, struct_line in enumerate(field_lines):
 425                 if idx == 0:
 426                     assert(struct_line == "typedef enum %s {" % struct_name)
 427                 elif idx == len(field_lines) - 3:
 428                     assert(struct_line.endswith("_Sentinel,"))
 429                 elif idx == len(field_lines) - 2:
 430                     assert(struct_line == "} %s;" % struct_name)
 431                 elif idx == len(field_lines) - 1:
 432                     assert(struct_line == "")
 433             (c_out, native_file_out, native_out) = consts.native_c_unitary_enum_map(struct_name, [x.strip().strip(",") for x in field_lines[1:-3]])
 434             write_c(c_out)
 435             out_java_enum.write(native_file_out)
 436             out_java.write(native_out)
 437
 438     def map_complex_enum(struct_name, union_enum_items):
 439         java_hu_type = struct_name.replace("LDK", "")
 440         complex_enums.add(struct_name)
 441
 442         enum_variants = []
 443         tag_field_lines = union_enum_items["field_lines"]
 444         for idx, struct_line in enumerate(tag_field_lines):
 445             if idx == 0:
 446                 assert(struct_line == "typedef enum %s_Tag {" % struct_name)
 447             elif idx == len(tag_field_lines) - 3:
 448                 assert(struct_line.endswith("_Sentinel,"))
 449             elif idx == len(tag_field_lines) - 2:
 450                 assert(struct_line == "} %s_Tag;" % struct_name)
 451             elif idx == len(tag_field_lines) - 1:
 452                 assert(struct_line == "")
 453             else:
 454                 variant_name = struct_line.strip(' ,')[len(struct_name) + 1:]
 455                 fields = []
 456                 if "LDK" + variant_name in union_enum_items:
 457                     enum_var_lines = union_enum_items["LDK" + variant_name]
 458                     for idx, field in enumerate(enum_var_lines):
 459                         if idx != 0 and idx < len(enum_var_lines) - 2:
 460                             fields.append(type_mapping_generator.map_type(field.strip(' ;'), False, None, False, True))
 461                         else:
 462                             # TODO: Assert line format
 463                             pass
 464                 else:
 465                     # TODO: Assert line format
 466                     pass
 467                 enum_variants.append(ComplexEnumVariantInfo(variant_name, fields))
 468
 469         with open(f"{sys.argv[3]}/structs/{java_hu_type}{consts.file_ext}", "w") as out_java_enum:
 470             (out_java_addendum, out_java_enum_addendum, out_c_addendum) = consts.map_complex_enum(struct_name, enum_variants, camel_to_snake)
 471
 472             out_java_enum.write(out_java_enum_addendum)
 473             out_java.write(out_java_addendum)
 474             write_c(out_c_addendum)
 475
 476     def map_trait(struct_name, field_var_lines, trait_fn_lines):
 477         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "w") as out_java_trait:
 478             field_var_convs = []
 479             for var_line in field_var_lines:
 480                 if var_line.group(1) in trait_structs:
 481                     field_var_convs.append((var_line.group(1), var_line.group(2)))
 482                 else:
 483                     field_var_convs.append(
 484                         type_mapping_generator.map_type(var_line.group(1) + " " + var_line.group(2), False, None, False, False))
 485
 486             field_fns = []
 487             for fn_line in trait_fn_lines:
 488                 ret_ty_info = type_mapping_generator.map_type(fn_line.group(2), True, None, False, False)
 489                 is_const = fn_line.group(4) is not None
 490
 491                 arg_tys = []
 492                 for idx, arg in enumerate(fn_line.group(5).split(',')):
 493                     if arg == "":
 494                         continue
 495                     arg_conv_info = type_mapping_generator.map_type(arg, True, None, False, False)
 496                     arg_tys.append(arg_conv_info)
 497                 field_fns.append(TraitMethInfo(fn_line.group(3), is_const, ret_ty_info, arg_tys))
 498
 499             (out_java_addendum, out_java_trait_addendum, out_c_addendum) = consts.native_c_map_trait(struct_name, field_var_convs, field_fns)
 500             write_c(out_c_addendum)
 501             out_java_trait.write(out_java_trait_addendum)
 502             out_java.write(out_java_addendum)
 503
 504         for fn_line in trait_fn_lines:
 505             # For now, just disable enabling the _call_log - we don't know how to inverse-map String
 506             is_log = fn_line.group(3) == "log" and struct_name == "LDKLogger"
 507             if fn_line.group(3) != "free" and fn_line.group(3) != "clone" and fn_line.group(3) != "eq" and not is_log:
 508                 dummy_line = fn_line.group(2) + struct_name.replace("LDK", "") + "_" + fn_line.group(3) + " " + struct_name + "* this_arg" + fn_line.group(5) + "\n"
 509                 map_fn(dummy_line, re.compile("([A-Za-z_0-9]*) *([A-Za-z_0-9]*) *(.*)").match(dummy_line), None, "(this_arg_conv->" + fn_line.group(3) + ")(this_arg_conv->this_arg")
 510         for idx, var_line in enumerate(field_var_lines):
 511             if var_line.group(1) not in trait_structs:
 512                 write_c(var_line.group(1) + " " + struct_name + "_set_get_" + var_line.group(2) + "(" + struct_name + "* this_arg) {\n")
 513                 write_c("\tif (this_arg->set_" + var_line.group(2) + " != NULL)\n")
 514                 write_c("\t\tthis_arg->set_" + var_line.group(2) + "(this_arg);\n")
 515                 write_c("\treturn this_arg->" + var_line.group(2) + ";\n")
 516                 write_c("}\n")
 517                 dummy_line = var_line.group(1) + " " + struct_name.replace("LDK", "") + "_get_" + var_line.group(2) + " " + struct_name + "* this_arg" + fn_line.group(5) + "\n"
 518                 map_fn(dummy_line, re.compile("([A-Za-z_0-9]*) *([A-Za-z_0-9]*) *(.*)").match(dummy_line), None, struct_name + "_set_get_" + var_line.group(2) + "(this_arg_conv")
 519
 520     def map_result(struct_name, res_ty, err_ty):
 521         result_types.add(struct_name)
 522         human_ty = struct_name.replace("LDKCResult", "Result")
 523         with open(f"{sys.argv[3]}/structs/{human_ty}{consts.file_ext}", "w") as out_java_struct:
 524             out_java_struct.write(consts.hu_struct_file_prefix)
 525             out_java_struct.write("public class " + human_ty + " extends CommonBase {\n")
 526             out_java_struct.write("\tprivate " + human_ty + "(Object _dummy, long ptr) { super(ptr); }\n")
 527             out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
 528             out_java_struct.write("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n")
 529             out_java_struct.write("\t}\n\n")
 530             out_java_struct.write("\tstatic " + human_ty + " constr_from_ptr(long ptr) {\n")
 531             out_java_struct.write("\t\tif (bindings." + struct_name + "_result_ok(ptr)) {\n")
 532             out_java_struct.write("\t\t\treturn new " + human_ty + "_OK(null, ptr);\n")
 533             out_java_struct.write("\t\t} else {\n")
 534             out_java_struct.write("\t\t\treturn new " + human_ty + "_Err(null, ptr);\n")
 535             out_java_struct.write("\t\t}\n")
 536             out_java_struct.write("\t}\n")
 537
 538             res_map = type_mapping_generator.map_type(res_ty + " res", True, None, False, True)
 539             err_map = type_mapping_generator.map_type(err_ty + " err", True, None, False, True)
 540             can_clone = True
 541             if not res_map.is_native_primitive and (res_map.rust_obj.replace("LDK", "") + "_clone" not in clone_fns):
 542                 can_clone = False
 543             if not err_map.is_native_primitive and (err_map.rust_obj.replace("LDK", "") + "_clone" not in clone_fns):
 544                 can_clone = False
 545
 546             out_java.write("\tpublic static native boolean " + struct_name + "_result_ok(long arg);\n")
 547             write_c(consts.c_fn_ty_pfx + "jboolean " + consts.c_fn_name_define_pfx(struct_name + "_result_ok", True) + consts.ptr_c_ty + " arg) {\n")
 548             write_c("\treturn ((" + struct_name + "*)arg)->result_ok;\n")
 549             write_c("}\n")
 550
 551             out_java.write("\tpublic static native " + res_map.java_ty + " " + struct_name + "_get_ok(long arg);\n")
 552             write_c(consts.c_fn_ty_pfx + res_map.c_ty + " " + consts.c_fn_name_define_pfx(struct_name + "_get_ok", True) + consts.ptr_c_ty + " arg) {\n")
 553             write_c("\t" + struct_name + " *val = (" + struct_name + "*)arg;\n")
 554             write_c("\tCHECK(val->result_ok);\n\t")
 555             out_java_struct.write("\tpublic static final class " + human_ty + "_OK extends " + human_ty + " {\n")
 556             if res_map.ret_conv is not None:
 557                 write_c(res_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.result)")
 558                 write_c(res_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + res_map.ret_conv_name)
 559             else:
 560                 write_c("return *val->contents.result")
 561             write_c(";\n}\n")
 562
 563             if res_map.java_hu_ty != "void":
 564                 out_java_struct.write("\t\tpublic final " + res_map.java_hu_ty + " res;\n")
 565             out_java_struct.write("\t\tprivate " + human_ty + "_OK(Object _dummy, long ptr) {\n")
 566             out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
 567             if res_map.java_hu_ty == "void":
 568                 pass
 569             elif res_map.to_hu_conv is not None:
 570                 out_java_struct.write("\t\t\t" + res_map.java_ty + " res = bindings." + struct_name + "_get_ok(ptr);\n")
 571                 out_java_struct.write("\t\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t\t"))
 572                 out_java_struct.write("\n\t\t\tthis.res = " + res_map.to_hu_conv_name + ";\n")
 573             else:
 574                 out_java_struct.write("\t\t\tthis.res = bindings." + struct_name + "_get_ok(ptr);\n")
 575             out_java_struct.write("\t\t}\n")
 576             if struct_name.startswith("LDKCResult_None"):
 577                 out_java_struct.write("\t\tpublic " + human_ty + "_OK() {\n\t\t\tthis(null, bindings.C" + human_ty + "_ok());\n")
 578             else:
 579                 out_java_struct.write("\t\tpublic " + human_ty + "_OK(" + res_map.java_hu_ty + " res) {\n")
 580                 if res_map.from_hu_conv is not None:
 581                     out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_ok(" + res_map.from_hu_conv[0] + "));\n")
 582                     if res_map.from_hu_conv[1] != "":
 583                         out_java_struct.write("\t\t\t" + res_map.from_hu_conv[1] + ";\n")
 584                 else:
 585                     out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_ok(res));\n")
 586             out_java_struct.write("\t\t}\n\t}\n\n")
 587
 588             out_java.write("\tpublic static native " + err_map.java_ty + " " + struct_name + "_get_err(long arg);\n")
 589             write_c(consts.c_fn_ty_pfx + err_map.c_ty + " " + consts.c_fn_name_define_pfx(struct_name + "_get_err", True) + consts.ptr_c_ty + " arg) {\n")
 590             write_c("\t" + struct_name + " *val = (" + struct_name + "*)arg;\n")
 591             write_c("\tCHECK(!val->result_ok);\n\t")
 592             out_java_struct.write("\tpublic static final class " + human_ty + "_Err extends " + human_ty + " {\n")
 593             if err_map.ret_conv is not None:
 594                 write_c(err_map.ret_conv[0].replace("\n", "\n\t") + "(*val->contents.err)")
 595                 write_c(err_map.ret_conv[1].replace("\n", "\n\t") + "\n\treturn " + err_map.ret_conv_name)
 596             else:
 597                 write_c("return *val->contents.err")
 598             write_c(";\n}\n")
 599
 600             if err_map.java_hu_ty != "void":
 601                 out_java_struct.write("\t\tpublic final " + err_map.java_hu_ty + " err;\n")
 602             out_java_struct.write("\t\tprivate " + human_ty + "_Err(Object _dummy, long ptr) {\n")
 603             out_java_struct.write("\t\t\tsuper(_dummy, ptr);\n")
 604             if err_map.java_hu_ty == "void":
 605                 pass
 606             elif err_map.to_hu_conv is not None:
 607                 out_java_struct.write("\t\t\t" + err_map.java_ty + " err = bindings." + struct_name + "_get_err(ptr);\n")
 608                 out_java_struct.write("\t\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t\t"))
 609                 out_java_struct.write("\n\t\t\tthis.err = " + err_map.to_hu_conv_name + ";\n")
 610             else:
 611                 out_java_struct.write("\t\t\tthis.err = bindings." + struct_name + "_get_err(ptr);\n")
 612             out_java_struct.write("\t\t}\n")
 613
 614             if struct_name.endswith("NoneZ"):
 615                 out_java_struct.write("\t\tpublic " + human_ty + "_Err() {\n\t\t\tthis(null, bindings.C" + human_ty + "_err());\n")
 616             else:
 617                 out_java_struct.write("\t\tpublic " + human_ty + "_Err(" + err_map.java_hu_ty + " err) {\n")
 618                 if err_map.from_hu_conv is not None:
 619                     out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_err(" + err_map.from_hu_conv[0] + "));\n")
 620                     if err_map.from_hu_conv[1] != "":
 621                         out_java_struct.write("\t\t\t" + err_map.from_hu_conv[1] + ";\n")
 622                 else:
 623                     out_java_struct.write("\t\t\tthis(null, bindings.C" + human_ty + "_err(err));\n")
 624             out_java_struct.write("\t\t}\n\t}\n}\n")
 625
 626     def map_tuple(struct_name, field_lines):
 627         out_java.write("\tpublic static native long " + struct_name + "_new(")
 628         write_c(consts.c_fn_ty_pfx + consts.ptr_c_ty + " " + consts.c_fn_name_define_pfx(struct_name + "_new", len(field_lines) > 3))
 629         ty_list = []
 630         for idx, line in enumerate(field_lines):
 631             if idx != 0 and idx < len(field_lines) - 2:
 632                 ty_info = java_c_types(line.strip(';'), None)
 633                 if idx != 1:
 634                     out_java.write(", ")
 635                     write_c(", ")
 636                 e = chr(ord('a') + idx - 1)
 637                 out_java.write(ty_info.java_ty + " " + e)
 638                 write_c(ty_info.c_ty + " " + e)
 639                 ty_list.append(ty_info)
 640         tuple_types[struct_name] = (ty_list, struct_name)
 641         out_java.write(");\n")
 642         write_c(") {\n")
 643         write_c("\t" + struct_name + "* ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 644         for idx, line in enumerate(field_lines):
 645             if idx != 0 and idx < len(field_lines) - 2:
 646                 ty_info = type_mapping_generator.map_type(line.strip(';'), False, None, False, False)
 647                 e = chr(ord('a') + idx - 1)
 648                 if ty_info.arg_conv is not None:
 649                     write_c("\t" + ty_info.arg_conv.replace("\n", "\n\t"))
 650                     write_c("\n\tret->" + e + " = " + ty_info.arg_conv_name + ";\n")
 651                 else:
 652                     write_c("\tret->" + e + " = " + e + ";\n")
 653                 if ty_info.arg_conv_cleanup is not None:
 654                     write_c("\t//TODO: Really need to call " + ty_info.arg_conv_cleanup + " here\n")
 655         write_c("\treturn (long)ret;\n")
 656         write_c("}\n")
 657
 658         for idx, ty_info in enumerate(ty_list):
 659             e = chr(ord('a') + idx)
 660             out_java.write("\tpublic static native " + ty_info.java_ty + " " + struct_name + "_get_" + e + "(long ptr);\n")
 661             write_c(consts.c_fn_ty_pfx + ty_info.c_ty + " " + consts.c_fn_name_define_pfx(struct_name + "_get_" + e, True) + consts.ptr_c_ty + " ptr) {\n")
 662             write_c("\t" + struct_name + " *tuple = (" + struct_name + "*)ptr;\n")
 663             conv_info = type_mapping_generator.map_type_with_info(ty_info, False, None, False, True)
 664             if conv_info.ret_conv is not None:
 665                 write_c("\t" + conv_info.ret_conv[0].replace("\n", "\n\t") + "tuple->" + e + conv_info.ret_conv[1].replace("\n", "\n\t") + "\n")
 666                 write_c("\treturn " + conv_info.ret_conv_name + ";\n")
 667             else:
 668                 write_c("\treturn tuple->" + e + ";\n")
 669             write_c("}\n")
 670
 671     out_java.write(consts.bindings_header)
 672
 673     with open(f"{sys.argv[3]}/structs/CommonBase{consts.file_ext}", "w") as out_java_struct:
 674         out_java_struct.write(consts.common_base)
 675
 676     in_block_comment = False
 677     cur_block_obj = None
 678
 679     const_val_regex = re.compile("^extern const ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 680
 681     line_indicates_result_regex = re.compile("^   union (LDKCResult_[A-Za-z_0-9]*Ptr) contents;$")
 682     line_indicates_vec_regex = re.compile("^   (struct |enum |union )?([A-Za-z_0-9]*) \*data;$")
 683     line_indicates_opaque_regex = re.compile("^   bool is_owned;$")
 684     line_indicates_trait_regex = re.compile("^   (struct |enum |union )?([A-Za-z_0-9]* \*?)\(\*([A-Za-z_0-9]*)\)\((const )?void \*this_arg(.*)\);$")
 685     assert(line_indicates_trait_regex.match("   uintptr_t (*send_data)(void *this_arg, LDKu8slice data, bool resume_read);"))
 686     assert(line_indicates_trait_regex.match("   struct LDKCVec_MessageSendEventZ (*get_and_clear_pending_msg_events)(const void *this_arg);"))
 687     assert(line_indicates_trait_regex.match("   void *(*clone)(const void *this_arg);"))
 688     assert(line_indicates_trait_regex.match("   struct LDKCVec_u8Z (*write)(const void *this_arg);"))
 689     line_field_var_regex = re.compile("^   struct ([A-Za-z_0-9]*) ([A-Za-z_0-9]*);$")
 690     assert(line_field_var_regex.match("   struct LDKMessageSendEventsProvider MessageSendEventsProvider;"))
 691     assert(line_field_var_regex.match("   struct LDKChannelPublicKeys pubkeys;"))
 692     struct_name_regex = re.compile("^typedef (struct|enum|union) (MUST_USE_STRUCT )?(LDK[A-Za-z_0-9]*) {$")
 693     assert(struct_name_regex.match("typedef struct LDKCVec_u8Z {"))
 694     assert(struct_name_regex.match("typedef enum LDKNetwork {"))
 695
 696     union_enum_items = {}
 697     result_ptr_struct_items = {}
 698     for line in in_h:
 699         if in_block_comment:
 700             if line.endswith("*/\n"):
 701                 in_block_comment = False
 702         elif cur_block_obj is not None:
 703             cur_block_obj  = cur_block_obj + line
 704             if line.startswith("} "):
 705                 field_lines = []
 706                 struct_name = None
 707                 vec_ty = None
 708                 obj_lines = cur_block_obj.split("\n")
 709                 is_opaque = False
 710                 result_contents = None
 711                 is_unitary_enum = False
 712                 is_union_enum = False
 713                 is_union = False
 714                 is_tuple = False
 715                 trait_fn_lines = []
 716                 field_var_lines = []
 717
 718                 for idx, struct_line in enumerate(obj_lines):
 719                     if struct_line.strip().startswith("/*"):
 720                         in_block_comment = True
 721                     if in_block_comment:
 722                         if struct_line.endswith("*/"):
 723                             in_block_comment = False
 724                     else:
 725                         struct_name_match = struct_name_regex.match(struct_line)
 726                         if struct_name_match is not None:
 727                             struct_name = struct_name_match.group(3)
 728                             if struct_name_match.group(1) == "enum":
 729                                 if not struct_name.endswith("_Tag"):
 730                                     is_unitary_enum = True
 731                                 else:
 732                                     is_union_enum = True
 733                             elif struct_name_match.group(1) == "union":
 734                                 is_union = True
 735                         if line_indicates_opaque_regex.match(struct_line):
 736                             is_opaque = True
 737                         result_match = line_indicates_result_regex.match(struct_line)
 738                         if result_match is not None:
 739                             result_contents = result_match.group(1)
 740                         vec_ty_match = line_indicates_vec_regex.match(struct_line)
 741                         if vec_ty_match is not None and struct_name.startswith("LDKCVec_"):
 742                             vec_ty = vec_ty_match.group(2)
 743                         elif struct_name.startswith("LDKC2Tuple_") or struct_name.startswith("LDKC3Tuple_"):
 744                             is_tuple = True
 745                         trait_fn_match = line_indicates_trait_regex.match(struct_line)
 746                         if trait_fn_match is not None:
 747                             trait_fn_lines.append(trait_fn_match)
 748                         field_var_match = line_field_var_regex.match(struct_line)
 749                         if field_var_match is not None:
 750                             field_var_lines.append(field_var_match)
 751                         field_lines.append(struct_line)
 752
 753                 assert(struct_name is not None)
 754                 assert(len(trait_fn_lines) == 0 or not (is_opaque or is_unitary_enum or is_union_enum or is_union or result_contents is not None or vec_ty is not None))
 755                 assert(not is_opaque or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_union or result_contents is not None or vec_ty is not None))
 756                 assert(not is_unitary_enum or not (len(trait_fn_lines) != 0 or is_opaque or is_union_enum or is_union or result_contents is not None or vec_ty is not None))
 757                 assert(not is_union_enum or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_opaque or is_union or result_contents is not None or vec_ty is not None))
 758                 assert(not is_union or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or result_contents is not None or vec_ty is not None))
 759                 assert(result_contents is None or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or is_union or vec_ty is not None))
 760                 assert(vec_ty is None or not (len(trait_fn_lines) != 0 or is_unitary_enum or is_union_enum or is_opaque or is_union or result_contents is not None))
 761
 762                 if is_opaque:
 763                     opaque_structs.add(struct_name)
 764                     with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "w") as out_java_struct:
 765                         out_opaque_struct_human = consts.map_opaque_struct(struct_name)
 766                         out_java_struct.write(out_opaque_struct_human)
 767                 elif result_contents is not None:
 768                     assert result_contents in result_ptr_struct_items
 769                     res_ty, err_ty = result_ptr_struct_items[result_contents]
 770                     map_result(struct_name, res_ty, err_ty)
 771                 elif struct_name.startswith("LDKCResult_") and struct_name.endswith("ZPtr"):
 772                     for line in field_lines:
 773                         if line.endswith("*result;"):
 774                             res_ty = line[:-8].strip()
 775                         elif line.endswith("*err;"):
 776                             err_ty = line[:-5].strip()
 777                     result_ptr_struct_items[struct_name] = (res_ty, err_ty)
 778                     result_types.add(struct_name[:-3])
 779                 elif is_tuple:
 780                     map_tuple(struct_name, field_lines)
 781                 elif vec_ty is not None:
 782                     ty_info = type_mapping_generator.map_type(vec_ty + " arr_elem", False, None, False, False)
 783                     if len(ty_info.java_fn_ty_arg) == 1: # ie we're a primitive of some form
 784                         out_java.write("\tpublic static native long " + struct_name + "_new(" + ty_info.java_ty + "[] elems);\n")
 785                         write_c(consts.c_fn_ty_pfx + consts.ptr_c_ty + " " + consts.c_fn_name_define_pfx(struct_name + "_new", True) + ty_info.c_ty + "Array elems) {\n")
 786                         write_c("\t" + struct_name + " *ret = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n")
 787                         write_c("\tret->datalen = " + consts.get_native_arr_len_call[0] + "elems" + consts.get_native_arr_len_call[1] + ";\n")
 788                         write_c("\tif (ret->datalen == 0) {\n")
 789                         write_c("\t\tret->data = NULL;\n")
 790                         write_c("\t} else {\n")
 791                         write_c("\t\tret->data = MALLOC(sizeof(" + vec_ty + ") * ret->datalen, \"" + struct_name + " Data\");\n")
 792                         native_arr_ptr_call = consts.get_native_arr_ptr_call(ty_info.ty_info)
 793                         write_c("\t\t" + ty_info.c_ty + " *java_elems = " + native_arr_ptr_call[0] + "elems" + native_arr_ptr_call[1] + ";\n")
 794                         write_c("\t\tfor (size_t i = 0; i < ret->datalen; i++) {\n")
 795                         if ty_info.arg_conv is not None:
 796                             write_c("\t\t\t" + ty_info.c_ty + " arr_elem = java_elems[i];\n")
 797                             write_c("\t\t\t" + ty_info.arg_conv.replace("\n", "\n\t\t\t") + "\n")
 798                             write_c("\t\t\tret->data[i] = " + ty_info.arg_conv_name + ";\n")
 799                             assert ty_info.arg_conv_cleanup is None
 800                         else:
 801                             write_c("\t\t\tret->data[i] = java_elems[i];\n")
 802                         write_c("\t\t}\n")
 803                         cleanup = consts.release_native_arr_ptr_call(ty_info.ty_info, "elems", "java_elems")
 804                         if cleanup is not None:
 805                             write_c("\t\t" + cleanup + ";\n")
 806                         write_c("\t}\n")
 807                         write_c("\treturn (long)ret;\n")
 808                         write_c("}\n")
 809
 810                     if ty_info.is_native_primitive:
 811                         clone_fns.add(struct_name.replace("LDK", "") + "_clone")
 812                         write_c("static inline " + struct_name + " " + struct_name.replace("LDK", "") + "_clone(const " + struct_name + " *orig) {\n")
 813                         write_c("\t" + struct_name + " ret = { .data = MALLOC(sizeof(" + ty_info.c_ty + ") * orig->datalen, \"" + struct_name + " clone bytes\"), .datalen = orig->datalen };\n")
 814                         write_c("\tmemcpy(ret.data, orig->data, sizeof(" + ty_info.c_ty + ") * ret.datalen);\n")
 815                         write_c("\treturn ret;\n}\n")
 816                     elif (ty_info.rust_obj.replace("LDK", "") + "_clone") in clone_fns:
 817                         ty_name = "CVec_" + ty_info.rust_obj.replace("LDK", "") + "Z";
 818                         clone_fns.add(ty_name + "_clone")
 819                         write_c("static inline " + struct_name + " " + ty_name + "_clone(const " + struct_name + " *orig) {\n")
 820                         write_c("\t" + struct_name + " ret = { .data = MALLOC(sizeof(" + ty_info.rust_obj + ") * orig->datalen, \"" + struct_name + " clone bytes\"), .datalen = orig->datalen };\n")
 821                         write_c("\tfor (size_t i = 0; i < ret.datalen; i++) {\n")
 822                         write_c("\t\tret.data[i] = " + ty_info.rust_obj.replace("LDK", "") + "_clone(&orig->data[i]);\n")
 823                         write_c("\t}\n\treturn ret;\n}\n")
 824                 elif is_union_enum:
 825                     assert(struct_name.endswith("_Tag"))
 826                     struct_name = struct_name[:-4]
 827                     union_enum_items[struct_name] = {"field_lines": field_lines}
 828                 elif struct_name.endswith("_Body") and struct_name.split("_")[0] in union_enum_items:
 829                     enum_var_name = struct_name.split("_")
 830                     union_enum_items[enum_var_name[0]][enum_var_name[1]] = field_lines
 831                 elif struct_name in union_enum_items:
 832                     map_complex_enum(struct_name, union_enum_items[struct_name])
 833                 elif is_unitary_enum:
 834                     map_unitary_enum(struct_name, field_lines)
 835                 elif len(trait_fn_lines) > 0:
 836                     trait_structs.add(struct_name)
 837                     map_trait(struct_name, field_var_lines, trait_fn_lines)
 838                 elif struct_name == "LDKTxOut":
 839                     with open(f"{sys.argv[3]}/structs/TxOut{consts.file_ext}", "w") as out_java_struct:
 840                         out_java_struct.write(consts.hu_struct_file_prefix)
 841                         out_java_struct.write("public class TxOut extends CommonBase{\n")
 842                         out_java_struct.write("\tTxOut(java.lang.Object _dummy, long ptr) { super(ptr); }\n")
 843                         out_java_struct.write("\tlong to_c_ptr() { return 0; }\n")
 844                         out_java_struct.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
 845                         out_java_struct.write("\tprotected void finalize() throws Throwable {\n")
 846                         out_java_struct.write("\t\tsuper.finalize();\n")
 847                         out_java_struct.write("\t\tif (ptr != 0) { bindings.TxOut_free(ptr); }\n")
 848                         out_java_struct.write("\t}\n")
 849                         # TODO: TxOut body
 850                         out_java_struct.write("}")
 851                 else:
 852                     pass # Everything remaining is a byte[] or some form
 853                 cur_block_obj = None
 854         else:
 855             fn_ptr = fn_ptr_regex.match(line)
 856             fn_ret_arr = fn_ret_arr_regex.match(line)
 857             reg_fn = reg_fn_regex.match(line)
 858             const_val = const_val_regex.match(line)
 859
 860             if line.startswith("#include <"):
 861                 pass
 862             elif line.startswith("/*"):
 863                 #out_java.write("\t" + line)
 864                 if not line.endswith("*/\n"):
 865                     in_block_comment = True
 866             elif line.startswith("typedef enum "):
 867                 cur_block_obj = line
 868             elif line.startswith("typedef struct "):
 869                 cur_block_obj = line
 870             elif line.startswith("typedef union "):
 871                 cur_block_obj = line
 872             elif fn_ptr is not None:
 873                 map_fn(line, fn_ptr, None, None)
 874             elif fn_ret_arr is not None:
 875                 map_fn(line, fn_ret_arr, fn_ret_arr.group(4), None)
 876             elif reg_fn is not None:
 877                 map_fn(line, reg_fn, None, None)
 878             elif const_val_regex is not None:
 879                 # TODO Map const variables
 880                 pass
 881             else:
 882                 assert(line == "\n")
 883
 884     out_java.write(consts.bindings_footer)
 885     for struct_name in opaque_structs:
 886         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "a") as out_java_struct:
 887             out_java_struct.write("}\n")
 888     for struct_name in trait_structs:
 889         with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "a") as out_java_struct:
 890             out_java_struct.write("}\n")
 891
 892 with open(sys.argv[4], "w") as out_c:
 893     out_c.write(consts.c_file_pfx)
 894     out_c.write(consts.init_str())
 895     out_c.write(c_file)