def map_complex_enum(struct_name, union_enum_items):
java_hu_type = struct_name.replace("LDK", "")
complex_enums.add(struct_name)
- with open(sys.argv[3] + "/structs/" + java_hu_type + ".java", "w") as out_java_enum:
- out_java_enum.write(consts.hu_struct_file_prefix)
- out_java_enum.write("public class " + java_hu_type + " extends CommonBase {\n")
- out_java_enum.write("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
- out_java_enum.write("\t@Override @SuppressWarnings(\"deprecation\")\n")
- out_java_enum.write("\tprotected void finalize() throws Throwable {\n")
- out_java_enum.write("\t\tsuper.finalize();\n")
- out_java_enum.write("\t\tif (ptr != 0) { bindings." + java_hu_type + "_free(ptr); }\n")
- out_java_enum.write("\t}\n")
- out_java_enum.write("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
- out_java_enum.write("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
- java_hu_subclasses = ""
-
- tag_field_lines = union_enum_items["field_lines"]
- init_meth_jty_strs = {}
- for idx, struct_line in enumerate(tag_field_lines):
- if idx == 0:
- assert(struct_line == "typedef enum %s_Tag {" % struct_name)
- elif idx == len(tag_field_lines) - 3:
- assert(struct_line.endswith("_Sentinel,"))
- elif idx == len(tag_field_lines) - 2:
- assert(struct_line == "} %s_Tag;" % struct_name)
- elif idx == len(tag_field_lines) - 1:
- assert(struct_line == "")
+ with open(f"{sys.argv[3]}/structs/{java_hu_type}{consts.file_ext}", "w") as out_java_enum:
+ (out_java_addendum, out_java_enum_addendum, out_c_addendum) = consts.map_complex_enum(struct_name, union_enum_items, map_type, camel_to_snake)
- out_java.write("\tpublic static class " + struct_name + " {\n")
- out_java.write("\t\tprivate " + struct_name + "() {}\n")
- for idx, struct_line in enumerate(tag_field_lines):
- if idx != 0 and idx < len(tag_field_lines) - 3:
- var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
- out_java.write("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
- java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var_name + " extends " + java_hu_type + " {\n"
- out_java_enum.write("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var_name + ".class) {\n")
- out_java_enum.write("\t\t\treturn new " + var_name + "(ptr, (bindings." + struct_name + "." + var_name + ")raw_val);\n")
- init_meth_jty_str = ""
- init_meth_params = ""
- init_meth_body = ""
- hu_conv_body = ""
- if "LDK" + var_name in union_enum_items:
- enum_var_lines = union_enum_items["LDK" + var_name]
- for idx, field in enumerate(enum_var_lines):
- if idx != 0 and idx < len(enum_var_lines) - 2:
- field_ty = map_type(field.strip(' ;'), False, None, False, True)
- out_java.write("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
- java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
- if field_ty.to_hu_conv is not None:
- hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
- hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
- hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
- else:
- hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
- init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
- if idx > 1:
- init_meth_params = init_meth_params + ", "
- init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
- init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
- out_java.write("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
- out_java.write(init_meth_body)
- out_java.write("}\n")
- out_java.write("\t\t}\n")
- out_java_enum.write("\t\t}\n")
- java_hu_subclasses = java_hu_subclasses + "\t\tprivate " + var_name + "(long ptr, bindings." + struct_name + "." + var_name + " obj) {\n\t\t\tsuper(null, ptr);\n"
- java_hu_subclasses = java_hu_subclasses + hu_conv_body
- java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
- init_meth_jty_strs[var_name] = init_meth_jty_str
- out_java.write("\t\tstatic native void init();\n")
- out_java.write("\t}\n")
- out_java_enum.write("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
- out_java_enum.write(java_hu_subclasses)
- out_java.write("\tstatic { " + struct_name + ".init(); }\n")
- out_java.write("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
-
- write_c(consts.c_complex_enum_pfx(struct_name, [x.strip(", ")[len(struct_name) + 1:] for x in tag_field_lines[1:-3]], init_meth_jty_strs))
-
- write_c(consts.c_fn_ty_pfx + consts.c_complex_enum_pass_ty(struct_name) + " " + consts.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1ref_1from_1ptr (" + consts.c_fn_args_pfx + ", " + consts.ptr_c_ty + " ptr) {\n")
- write_c("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
- write_c("\tswitch(obj->tag) {\n")
- for idx, struct_line in enumerate(tag_field_lines):
- if idx != 0 and idx < len(tag_field_lines) - 3:
- var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
- write_c("\t\tcase " + struct_name + "_" + var_name + ": {\n")
- c_params = []
- if "LDK" + var_name in union_enum_items:
- enum_var_lines = union_enum_items["LDK" + var_name]
- for idx, field in enumerate(enum_var_lines):
- if idx != 0 and idx < len(enum_var_lines) - 2:
- field_map = map_type(field.strip(' ;'), False, None, False, True)
- if field_map.ret_conv is not None:
- write_c("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
- write_c("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
- write_c(field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
- c_params.append(field_map.ret_conv_name)
- else:
- c_params.append("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
- write_c("\t\t\treturn " + consts.c_constr_native_complex_enum(struct_name, var_name, c_params) + ";\n")
- write_c("\t\t}\n")
- write_c("\t\tdefault: abort();\n")
- write_c("\t}\n}\n")
- out_java_enum.write("}\n")
+ out_java_enum.write(out_java_enum_addendum)
+ out_java.write(out_java_addendum)
+ write_c(out_c_addendum)
def map_trait(struct_name, field_var_lines, trait_fn_lines):
with open(f"{sys.argv[3]}/structs/{struct_name.replace('LDK', '')}{consts.file_ext}", "w") as out_java_trait:
out_c = out_c + "}\n"
return ("", out_c)
+
+ def map_complex_enum(self, struct_name, union_enum_items, map_type, camel_to_snake):
+ java_hu_type = struct_name.replace("LDK", "")
+ out_java_enum = ""
+ out_java = ""
+ out_c = ""
+
+ out_java_enum += (self.hu_struct_file_prefix)
+ out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
+ out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
+ out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
+ out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
+ out_java_enum += ("\t\tsuper.finalize();\n")
+ out_java_enum += ("\t\tif (ptr != 0) { bindings." + java_hu_type + "_free(ptr); }\n")
+ out_java_enum += ("\t}\n")
+ out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
+ out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
+ java_hu_subclasses = ""
+
+ tag_field_lines = union_enum_items["field_lines"]
+ init_meth_jty_strs = {}
+ for idx, struct_line in enumerate(tag_field_lines):
+ if idx == 0:
+ assert(struct_line == "typedef enum %s_Tag {" % struct_name)
+ elif idx == len(tag_field_lines) - 3:
+ assert(struct_line.endswith("_Sentinel,"))
+ elif idx == len(tag_field_lines) - 2:
+ assert(struct_line == "} %s_Tag;" % struct_name)
+ elif idx == len(tag_field_lines) - 1:
+ assert(struct_line == "")
+
+ out_java += ("\tpublic static class " + struct_name + " {\n")
+ out_java += ("\t\tprivate " + struct_name + "() {}\n")
+ for idx, struct_line in enumerate(tag_field_lines):
+ if idx != 0 and idx < len(tag_field_lines) - 3:
+ var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
+ out_java += ("\t\tpublic final static class " + var_name + " extends " + struct_name + " {\n")
+ java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var_name + " extends " + java_hu_type + " {\n"
+ out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var_name + ".class) {\n")
+ out_java_enum += ("\t\t\treturn new " + var_name + "(ptr, (bindings." + struct_name + "." + var_name + ")raw_val);\n")
+ init_meth_jty_str = ""
+ init_meth_params = ""
+ init_meth_body = ""
+ hu_conv_body = ""
+ if "LDK" + var_name in union_enum_items:
+ enum_var_lines = union_enum_items["LDK" + var_name]
+ for idx, field in enumerate(enum_var_lines):
+ if idx != 0 and idx < len(enum_var_lines) - 2:
+ field_ty = map_type(field.strip(' ;'), False, None, False, True)
+ out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
+ java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
+ if field_ty.to_hu_conv is not None:
+ hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
+ hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
+ hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
+ else:
+ hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
+ init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
+ if idx > 1:
+ init_meth_params = init_meth_params + ", "
+ init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
+ init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
+ out_java += ("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
+ out_java += (init_meth_body)
+ out_java += ("}\n")
+ out_java += ("\t\t}\n")
+ out_java_enum += ("\t\t}\n")
+ java_hu_subclasses = java_hu_subclasses + "\t\tprivate " + var_name + "(long ptr, bindings." + struct_name + "." + var_name + " obj) {\n\t\t\tsuper(null, ptr);\n"
+ java_hu_subclasses = java_hu_subclasses + hu_conv_body
+ java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
+ init_meth_jty_strs[var_name] = init_meth_jty_str
+ out_java += ("\t\tstatic native void init();\n")
+ out_java += ("\t}\n")
+ out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
+ out_java_enum += (java_hu_subclasses)
+ out_java += ("\tstatic { " + struct_name + ".init(); }\n")
+ out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
+
+ out_c += (self.c_complex_enum_pfx(struct_name, [x.strip(", ")[len(struct_name) + 1:] for x in tag_field_lines[1:-3]], init_meth_jty_strs))
+
+ out_c += (self.c_fn_ty_pfx + self.c_complex_enum_pass_ty(struct_name) + " " + self.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1ref_1from_1ptr (" + self.c_fn_args_pfx + ", " + self.ptr_c_ty + " ptr) {\n")
+ out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
+ out_c += ("\tswitch(obj->tag) {\n")
+ for idx, struct_line in enumerate(tag_field_lines):
+ if idx != 0 and idx < len(tag_field_lines) - 3:
+ var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
+ out_c += ("\t\tcase " + struct_name + "_" + var_name + ": {\n")
+ c_params = []
+ if "LDK" + var_name in union_enum_items:
+ enum_var_lines = union_enum_items["LDK" + var_name]
+ for idx, field in enumerate(enum_var_lines):
+ if idx != 0 and idx < len(enum_var_lines) - 2:
+ field_map = map_type(field.strip(' ;'), False, None, False, True)
+ if field_map.ret_conv is not None:
+ out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
+ out_c += ("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
+ out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
+ c_params.append(field_map.ret_conv_name)
+ else:
+ c_params.append("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
+ out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var_name, c_params) + ";\n")
+ out_c += ("\t\t}\n")
+ out_c += ("\t\tdefault: abort();\n")
+ out_c += ("\t}\n}\n")
+ out_java_enum += ("}\n")
+ return (out_java, out_java_enum, out_c)
out_c = "static inline " + struct_name + " " + struct_name + "_from_js(int32_t ord) {\n"
out_c = out_c + "\tswitch (ord) {\n"
ord_v = 0
+
+ out_typescript_enum_fields = ""
+
for var in variants:
out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
ord_v = ord_v + 1
+ out_typescript_enum_fields += f"{var},\n\t\t\t\t"
out_c = out_c + "\t}\n"
out_c = out_c + "\tabort();\n"
out_c = out_c + "}\n"
out_c = out_c + "\t\tdefault: abort();\n"
out_c = out_c + "\t}\n"
out_c = out_c + "}\n"
- return (out_c, "", "")
+
+ out_typescript_enum = f"""
+ export enum {struct_name} {{
+ {out_typescript_enum_fields}
+ }}
+ """
+
+ return (out_c, out_typescript_enum, "")
def c_unitary_enum_to_native_call(self, ty_info):
return (ty_info.rust_obj + "_to_js(", ")")
def native_c_map_trait(self, struct_name, field_var_convs, field_fn_lines):
return ("", "")
+
+ def map_complex_enum(self, struct_name, union_enum_items, map_type, camel_to_snake):
+ java_hu_type = struct_name.replace("LDK", "")
+
+ out_java_enum = ""
+ out_java = ""
+ out_c = ""
+
+ out_java_enum += (self.hu_struct_file_prefix)
+ out_java_enum += ("export default class " + java_hu_type + " extends CommonBase {\n")
+ out_java_enum += ("\tprotected constructor(_dummy: object, ptr: number) { super(ptr); }\n")
+ out_java_enum += ("\tprotected finalize() {\n")
+ out_java_enum += ("\t\tsuper.finalize();\n")
+ out_java_enum += ("\t\tif (this.ptr != 0) { bindings." + java_hu_type + "_free(this.ptr); }\n")
+ out_java_enum += ("\t}\n")
+ out_java_enum += f"\tstatic constr_from_ptr(ptr: number): {java_hu_type} {{\n"
+ out_java_enum += (f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
+ java_hu_subclasses = ""
+
+ tag_field_lines = union_enum_items["field_lines"]
+ init_meth_jty_strs = {}
+ for idx, struct_line in enumerate(tag_field_lines):
+ if idx == 0:
+ assert(struct_line == "typedef enum %s_Tag {" % struct_name)
+ elif idx == len(tag_field_lines) - 3:
+ assert(struct_line.endswith("_Sentinel,"))
+ elif idx == len(tag_field_lines) - 2:
+ assert(struct_line == "} %s_Tag;" % struct_name)
+ elif idx == len(tag_field_lines) - 1:
+ assert(struct_line == "")
+
+ out_java += ("\tpublic static class " + struct_name + " {\n")
+ out_java += ("\t\tprivate " + struct_name + "() {}\n")
+ for idx, struct_line in enumerate(tag_field_lines):
+ if idx != 0 and idx < len(tag_field_lines) - 3:
+ var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
+ out_java += ("\t\texport class " + var_name + " extends " + struct_name + " {\n")
+ java_hu_subclasses = java_hu_subclasses + "export class " + var_name + " extends " + java_hu_type + " {\n"
+ out_java_enum += ("\t\tif (raw_val instanceof bindings." + struct_name + "." + var_name + ") {\n")
+ out_java_enum += ("\t\t\treturn new " + var_name + "(this.ptr, raw_val);\n")
+ init_meth_jty_str = ""
+ init_meth_params = ""
+ init_meth_body = ""
+ hu_conv_body = ""
+ if "LDK" + var_name in union_enum_items:
+ enum_var_lines = union_enum_items["LDK" + var_name]
+ for idx, field in enumerate(enum_var_lines):
+ if idx != 0 and idx < len(enum_var_lines) - 2:
+ field_ty = map_type(field.strip(' ;'), False, None, False, True)
+ out_java += ("\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n")
+ java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
+ if field_ty.to_hu_conv is not None:
+ hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
+ hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
+ hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
+ else:
+ hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
+ init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
+ if idx > 1:
+ init_meth_params = init_meth_params + ", "
+ init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
+ init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
+ out_java += ("\t\t\t" + var_name + "(" + init_meth_params + ") { ")
+ out_java += (init_meth_body)
+ out_java += ("}\n")
+ out_java += ("\t\t}\n")
+ out_java_enum += ("\t\t}\n")
+ java_hu_subclasses = java_hu_subclasses + "\tprivate constructor(ptr: number, obj: bindings." + struct_name + "." + var_name + ") {\n\t\tsuper(null, ptr);\n"
+ java_hu_subclasses = java_hu_subclasses + hu_conv_body
+ java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
+ init_meth_jty_strs[var_name] = init_meth_jty_str
+ out_java += ("\t\tstatic native void init();\n")
+ out_java += ("\t}\n")
+ out_java_enum += ("\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
+ out_java += ("\tstatic { " + struct_name + ".init(); }\n")
+ out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
+
+ out_c += (self.c_complex_enum_pfx(struct_name, [x.strip(", ")[len(struct_name) + 1:] for x in tag_field_lines[1:-3]], init_meth_jty_strs))
+
+ out_c += (self.c_fn_ty_pfx + self.c_complex_enum_pass_ty(struct_name) + " " + self.c_fn_name_pfx + struct_name.replace("_", "_1") + "_1ref_1from_1ptr (" + self.c_fn_args_pfx + ", " + self.ptr_c_ty + " ptr) {\n")
+ out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)ptr;\n")
+ out_c += ("\tswitch(obj->tag) {\n")
+ for idx, struct_line in enumerate(tag_field_lines):
+ if idx != 0 and idx < len(tag_field_lines) - 3:
+ var_name = struct_line.strip(' ,')[len(struct_name) + 1:]
+ out_c += ("\t\tcase " + struct_name + "_" + var_name + ": {\n")
+ c_params = []
+ if "LDK" + var_name in union_enum_items:
+ enum_var_lines = union_enum_items["LDK" + var_name]
+ for idx, field in enumerate(enum_var_lines):
+ if idx != 0 and idx < len(enum_var_lines) - 2:
+ field_map = map_type(field.strip(' ;'), False, None, False, True)
+ if field_map.ret_conv is not None:
+ out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
+ out_c += ("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
+ out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
+ c_params.append(field_map.ret_conv_name)
+ else:
+ c_params.append("obj->" + camel_to_snake(var_name) + "." + field_map.arg_name)
+ out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var_name, c_params) + ";\n")
+ out_c += ("\t\t}\n")
+ out_c += ("\t\tdefault: abort();\n")
+ out_c += ("\t}\n}\n")
+ out_java_enum += ("}\n")
+ out_java_enum += (java_hu_subclasses)
+ return (out_java, out_java_enum, out_c)
+
+
+
+def camel_to_snake_case(str):
+ res = [str[0].lower()]
+ for i in range(1, len(str)):
+ current_char = str[i]
+
+ previous_char = None
+ next_char = None
+ if i > 0:
+ previous_char = str[i - 1]
+ if i < len(str) - 1:
+ next_char = str[i + 1]
+
+ if current_char.isupper() and previous_char is not None:
+ if previous_char.islower() or (next_char is not None and next_char.islower()):
+ res.append('_')
+ res.append(current_char.lower())
+ continue
+ res.append(current_char.lower())
+
+ return ''.join(res)