gdnative_cpp/binding_generator.py

#!/usr/bin/env python
from __future__ import print_function
import json
import os
import errno
from pathlib import Path

# Convenience function for using template get_node
def correct_method_name(method_list):
    for method in method_list:
        if method["name"] == "get_node":
            method["name"] = "get_node_internal"

def class_name_to_file_name(class_name):
    new_name = ""

    upper_count = 0
    upper_str = ""
    for i in range(len(class_name)):
        c = class_name[i]

        if c.isupper():
            upper_str += c
        else:
            if len(upper_str) > 0:
                if len(new_name) > 0:
                    new_name += "_"

                new_name += upper_str.lower()
                upper_str = ""

            new_name += c

    if len(upper_str) > 0:
        if len(new_name) > 0:
            new_name += "_"
                    
        new_name += upper_str.lower()

    return new_name

classes = []


def get_file_list(api_filepath, output_dir, headers=False, sources=False):
    global classes
    files = []
    with open(api_filepath) as api_file:
        classes = json.load(api_file)
    include_gen_folder = Path(output_dir) / "gen"
    source_gen_folder = Path(output_dir) / "gen"
    for _class in classes:
        header_filename = include_gen_folder / (class_name_to_file_name(strip_name(_class["name"])) + ".h")
        source_filename = source_gen_folder / (class_name_to_file_name(strip_name(_class["name"])) + ".cpp")
        if headers:
            files.append(str(header_filename.as_posix()))
        if sources:
            files.append(str(source_filename.as_posix()))
    icall_header_filename = include_gen_folder / "__icalls.h"
    register_types_filename = source_gen_folder / "__register_types.cpp"
    init_method_bindings_filename = source_gen_folder / "__init_method_bindings.cpp"
    if headers:
        files.append(str(icall_header_filename.as_posix()))
    if sources:
        files.append(str(register_types_filename.as_posix()))
        files.append(str(init_method_bindings_filename.as_posix()))
    return files


def print_file_list(api_filepath, output_dir, headers=False, sources=False):
    for f in get_file_list(api_filepath, output_dir, headers, sources):
        print(f, end=";")


def scons_emit_files(target, source, env):
    files = [env.File(f) for f in get_file_list(str(source[0]), target[0].abspath, True, True)]
    env.Clean(target, files)
    env["pandemonium_cpp_gen_dir"] = target[0].abspath
    return files, source


def scons_generate_bindings(target, source, env):
    generate_bindings(str(source[0]), env["generate_template_get_node"], env["pandemonium_cpp_gen_dir"])
    return None


def generate_bindings(api_filepath, use_template_get_node, output_dir="."):
    global classes
    with open(api_filepath) as api_file:
        classes = json.load(api_file)

    icalls = set()
    include_gen_folder = Path(output_dir) / "gen"
    source_gen_folder = Path(output_dir) / "gen"

    include_gen_folder.mkdir(parents=True, exist_ok=True)
    source_gen_folder.mkdir(parents=True, exist_ok=True)

    for c in classes:
        # print(c['name'])
        used_classes = sorted(get_used_classes(c))
        if use_template_get_node and c["name"] == "Node":
            correct_method_name(c["methods"])

        header = generate_class_header(used_classes, c, use_template_get_node)

        impl = generate_class_implementation(icalls, used_classes, c, use_template_get_node)

        header_filename = include_gen_folder / (class_name_to_file_name(strip_name(c["name"])) + ".h")
        with header_filename.open("w+") as header_file:
            header_file.write(header)

        source_filename = source_gen_folder / (class_name_to_file_name(strip_name(c["name"]) )+ ".cpp")
        with source_filename.open("w+") as source_file:
            source_file.write(impl)

    icall_header_filename = include_gen_folder / "__icalls.h"
    with icall_header_filename.open("w+") as icall_header_file:
        icall_header_file.write(generate_icall_header(icalls))

    register_types_filename = source_gen_folder / "__register_types.cpp"
    with register_types_filename.open("w+") as register_types_file:
        register_types_file.write(generate_type_registry(classes))

    init_method_bindings_filename = source_gen_folder / "__init_method_bindings.cpp"
    with init_method_bindings_filename.open("w+") as init_method_bindings_file:
        init_method_bindings_file.write(generate_init_method_bindings(classes))


def is_reference_type(t):
    for c in classes:
        if c["name"] != t:
            continue
        if c["is_reference"]:
            return True
    return False


def make_gdnative_type(t, ref_allowed):
    if is_enum(t):
        return remove_enum_prefix(t) + " "
    elif is_class_type(t):
        if is_reference_type(t) and ref_allowed:
            return "Ref<" + strip_name(t) + "> "
        else:
            return strip_name(t) + " *"
    else:
        if t == "int":
            return "int64_t "
        if t == "float" or t == "real":
            return "real_t "
        return strip_name(t) + " "


def generate_class_header(used_classes, c, use_template_get_node):

    source = []
    source.append("#ifndef PANDEMONIUM_CPP_" + strip_name(c["name"]).upper() + "_H")
    source.append("#define PANDEMONIUM_CPP_" + strip_name(c["name"]).upper() + "_H")
    source.append("")
    source.append("")

    source.append("#include <gdnative_api_struct.gen.h>")
    source.append("#include <cstdint>")
    source.append("")

    source.append("#include <core/core_types.h>")

    class_name = strip_name(c["name"])

    # Ref<T> is not included in object.h in Pandemonium either,
    # so don't include it here because it's not needed
    if class_name != "Object" and class_name != "Reference":
        source.append("#include <core/ref.h>")
        ref_allowed = True
    else:
        source.append("#include <core/tag_db.h>")
        ref_allowed = False

    included = []

    for used_class in used_classes:
        if is_enum(used_class) and is_nested_type(used_class):
            used_class_name = remove_enum_prefix(extract_nested_type(used_class))
            if used_class_name not in included:
                included.append(used_class_name)
                source.append('#include "' + class_name_to_file_name(used_class_name) + '.h"')
        elif is_enum(used_class) and is_nested_type(used_class) and not is_nested_type(used_class, class_name):
            used_class_name = remove_enum_prefix(used_class)
            if used_class_name not in included:
                included.append(used_class_name)
                source.append('#include "' + class_name_to_file_name(used_class_name) + '.h"')

    source.append("")

    if c["base_class"] != "":
        source.append('#include "' + class_name_to_file_name(strip_name(c["base_class"])) + '.h"')

    source.append("")

    for used_type in used_classes:
        if is_enum(used_type) or is_nested_type(used_type, class_name):
            continue
        else:
            source.append("class " + strip_name(used_type) + ";")

    source.append("")

    vararg_templates = ""

    # generate the class definition here
    source.append(
        "class "
        + class_name
        + (" : public _Wrapped" if c["base_class"] == "" else (" : public " + strip_name(c["base_class"])))
        + " {"
    )

    if c["base_class"] == "":
        source.append("public: enum { ___CLASS_IS_SCRIPT = 0, };")
        source.append("")
        source.append("private:")

    if c["singleton"]:
        source.append("\tstatic " + class_name + " *_singleton;")
        source.append("")
        source.append("\t" + class_name + "();")
        source.append("")

    # Generate method table
    source.append("\tstruct ___method_bindings {")

    for method in c["methods"]:
        source.append("\t\tpandemonium_method_bind *mb_" + method["name"] + ";")

    source.append("\t};")
    source.append("\tstatic ___method_bindings ___mb;")
    source.append("\tstatic void *_detail_class_tag;")
    source.append("")
    source.append("public:")
    source.append("\tstatic void ___init_method_bindings();")

    # class id from core engine for casting
    source.append("\tinline static size_t ___get_id() { return (size_t)_detail_class_tag; }")

    source.append("")

    if c["singleton"]:
        source.append("\tstatic inline " + class_name + " *get_singleton()")
        source.append("\t{")
        source.append("\t\tif (!" + class_name + "::_singleton) {")
        source.append("\t\t\t" + class_name + "::_singleton = new " + class_name + ";")
        source.append("\t\t}")
        source.append("\t\treturn " + class_name + "::_singleton;")
        source.append("\t}")
        source.append("")

        # Pandemonium::api->pandemonium_global_get_singleton((char *) \"" + strip_name(c["name"]) + "\");"

    # class name:
    # Two versions needed needed because when the user implements a custom class,
    # we want to override `___get_class_name` while `___get_pandemonium_class_name` can keep returning the base name
    source.append(
        '\tstatic inline const char *___get_class_name() { return (const char *) "' + strip_name(c["name"]) + '"; }'
    )
    source.append(
        '\tstatic inline const char *___get_pandemonium_class_name() { return (const char *) "'
        + strip_name(c["name"])
        + '"; }'
    )

    source.append(
        "\tstatic inline Object *___get_from_variant(Variant a) { pandemonium_object *o = (pandemonium_object*) a; return (o) ? (Object *) Pandemonium::nativescript_api->pandemonium_nativescript_get_instance_binding_data(_RegisterState::language_index, o) : nullptr; }"
    )

    enum_values = []

    source.append("\n\t// enums")
    for enum in c["enums"]:
        source.append("\tenum " + strip_name(enum["name"]) + " {")
        for value in enum["values"]:
            source.append("\t\t" + remove_nested_type_prefix(value) + " = " + str(enum["values"][value]) + ",")
            enum_values.append(value)
        source.append("\t};")

    source.append("\n\t// constants")

    for name in c["constants"]:
        if name not in enum_values:
            source.append("\tconst static int " + name + " = " + str(c["constants"][name]) + ";")

    if c["instanciable"]:
        source.append("")
        source.append("")
        source.append("\tstatic " + class_name + " *_new();")

    source.append("\n\t// methods")

    if class_name == "Object":
        source.append("#ifndef PANDEMONIUM_CPP_NO_OBJECT_CAST")
        source.append("\ttemplate<class T>")
        source.append("\tstatic T *cast_to(const Object *obj);")
        source.append("#endif")
        source.append("")

    for method in c["methods"]:
        method_signature = ""

        # TODO decide what to do about virtual methods
        # method_signature += "virtual " if method["is_virtual"] else ""
        method_signature += make_gdnative_type(method["return_type"], ref_allowed)
        method_name = escape_cpp(method["name"])
        method_signature += method_name + "("

        has_default_argument = False
        method_arguments = ""

        for i, argument in enumerate(method["arguments"]):
            method_signature += "const " + make_gdnative_type(argument["type"], ref_allowed)
            argument_name = escape_cpp(argument["name"])
            method_signature += argument_name
            method_arguments += argument_name

            # default arguments
            def escape_default_arg(_type, default_value):
                if _type == "Color":
                    return "Color" + default_value
                if _type == "bool" or _type == "int":
                    return default_value.lower()
                if _type == "Array":
                    return "Array()"
                if _type in [
                    "PoolVector2Array",
                    "PoolVector2iArray",
                    "PoolStringArray",
                    "PoolVector3Array",
                    "PoolVector3iArray",
                    "PoolVector4Array",
                    "PoolVector4iArray",
                    "PoolColorArray",
                    "PoolIntArray",
                    "PoolRealArray",
                    "PoolByteArray",
                ]:
                    return _type + "()"
                if _type == "Vector2":
                    return "Vector2" + default_value
                if _type == "Vector2i":
                    return "Vector2i" + default_value
                if _type == "Vector3":
                    return "Vector3" + default_value
                if _type == "Vector3i":
                    return "Vector3i" + default_value
                if _type == "Vector4":
                    return "Vector4" + default_value
                if _type == "Vector4i":
                    return "Vector4i" + default_value
                if _type == "Transform":
                    return "Transform()"
                if _type == "Transform2D":
                    return "Transform2D()"
                if _type == "Projection":
                    return "Transform2D()"
                if _type == "Rect2":
                    return "Rect2" + default_value.replace('[P: (', "(").replace("), S: (", ", ").replace(")]", ")")
                if _type == "Rect2i":
                    return "Rect2i" + default_value.replace('[P: (', "(").replace("), S: (", ", ").replace(")]", ")")
                if _type == "Variant":
                    return "Variant()" if default_value == "Null" else default_value
                if _type == "String" or _type == "NodePath" or _type == "StringName":
                    return '"' + default_value + '"'
                if _type == "RID":
                    return "RID()"

                if default_value == "Null" or default_value == "[Object:null]":
                    return "nullptr"

                if _type == 'float':
                    return default_value.replace("inf", "Math_INF")

                return default_value

            if argument["has_default_value"] or has_default_argument:
                method_signature += " = " + escape_default_arg(argument["type"], argument["default_value"])
                has_default_argument = True

            if i != len(method["arguments"]) - 1:
                method_signature += ", "
                method_arguments += ","

        if method["has_varargs"]:
            if len(method["arguments"]) > 0:
                method_signature += ", "
                method_arguments += ", "
            vararg_templates += (
                "\ttemplate <class... Args> "
                + method_signature
                + "Args... args){\n\t\treturn "
                + method_name
                + "("
                + method_arguments
                + "Array::make(args...));\n\t}\n"
                ""
            )
            method_signature += "const Array& __var_args = Array()"

        method_signature += ")" + (" const" if method["is_const"] else "")

        source.append("\t" + method_signature + ";")

    source.append(vararg_templates)

    if use_template_get_node and class_name == "Node":
        # Extra definition for template get_node that calls the renamed get_node_internal; has a default template parameter for backwards compatibility.
        source.append("\ttemplate <class T = Node>")
        source.append("\tT *get_node(const NodePath path) const {")
        source.append("\t\treturn Object::cast_to<T>(get_node_internal(path));")
        source.append("\t}")

        source.append("};")
        source.append("")

        # ...And a specialized version so we don't unnecessarily cast when using the default.
        source.append("template <>")
        source.append("inline Node *Node::get_node<Node>(const NodePath path) const {")
        source.append("\treturn get_node_internal(path);")
        source.append("}")
        source.append("")
    else:
        source.append("};")
        source.append("")

    source.append("")

    source.append("#endif")

    return "\n".join(source)


def generate_class_implementation(icalls, used_classes, c, use_template_get_node):
    class_name = strip_name(c["name"])

    ref_allowed = class_name != "Object" and class_name != "Reference"

    source = []
    source.append('#include "' + class_name_to_file_name(class_name) + '.h"')
    source.append("")
    source.append("")

    source.append("#include <core/pandemonium_global.h>")
    source.append("#include <core/core_types.h>")
    source.append("#include <core/ref.h>")

    source.append("#include <core/pandemonium.h>")
    source.append("")

    source.append('#include "__icalls.h"')
    source.append("")
    source.append("")

    for used_class in used_classes:
        if is_enum(used_class):
            continue
        else:
            source.append('#include "' + class_name_to_file_name(strip_name(used_class)) + '.h"')

    source.append("")
    source.append("")

    core_object_name = "this"

    source.append("")
    source.append("")

    if c["singleton"]:
        source.append("" + class_name + " *" + class_name + "::_singleton = NULL;")
        source.append("")
        source.append("")

        # FIXME Test if inlining has a huge impact on binary size
        source.append(class_name + "::" + class_name + "() {")
        source.append('\t_owner = Pandemonium::api->pandemonium_global_get_singleton((char *) "' + strip_name(c["name"]) + '");')
        source.append("}")

        source.append("")
        source.append("")

    # Method table initialization
    source.append(class_name + "::___method_bindings " + class_name + "::___mb = {};")
    source.append("")

    source.append("void *" + class_name + "::_detail_class_tag = nullptr;")
    source.append("")

    source.append("void " + class_name + "::___init_method_bindings() {")

    for method in c["methods"]:
        source.append(
            "\t___mb.mb_"
            + method["name"]
            + ' = Pandemonium::api->pandemonium_method_bind_get_method("'
            + c["name"]
            + '", "'
            + ("get_node" if use_template_get_node and method["name"] == "get_node_internal" else method["name"])
            + '");'
        )

    source.append("\tpandemonium_string_name class_name;")
    source.append('\tPandemonium::api->pandemonium_string_name_new_data_char(&class_name, "' + c["name"] + '");')
    source.append("\t_detail_class_tag = Pandemonium::api->pandemonium_get_class_tag(&class_name);")
    source.append("\tPandemonium::api->pandemonium_string_name_destroy(&class_name);")

    source.append("}")
    source.append("")

    if c["instanciable"]:
        source.append(class_name + " *" + strip_name(c["name"]) + "::_new()")
        source.append("{")
        source.append(
            "\treturn ("
            + class_name
            + ' *) Pandemonium::nativescript_api->pandemonium_nativescript_get_instance_binding_data(_RegisterState::language_index, Pandemonium::api->pandemonium_get_class_constructor((char *)"'
            + c["name"]
            + '")());'
        )
        source.append("}")

    for method in c["methods"]:
        method_signature = ""

        method_signature += make_gdnative_type(method["return_type"], ref_allowed)
        method_signature += strip_name(c["name"]) + "::" + escape_cpp(method["name"]) + "("

        for i, argument in enumerate(method["arguments"]):
            method_signature += "const " + make_gdnative_type(argument["type"], ref_allowed)
            method_signature += escape_cpp(argument["name"])

            if i != len(method["arguments"]) - 1:
                method_signature += ", "

        if method["has_varargs"]:
            if len(method["arguments"]) > 0:
                method_signature += ", "
            method_signature += "const Array& __var_args"

        method_signature += ")" + (" const" if method["is_const"] else "")

        source.append(method_signature + " {")

        if method["name"] == "free":
            # dirty hack because Object::free is marked virtual but doesn't actually exist...
            source.append("\tPandemonium::api->pandemonium_object_destroy(_owner);")
            source.append("}")
            source.append("")
            continue

        return_statement = ""
        return_type_is_ref = is_reference_type(method["return_type"]) and ref_allowed

        if method["return_type"] != "void":
            if is_class_type(method["return_type"]):
                if is_enum(method["return_type"]):
                    return_statement += "return (" + remove_enum_prefix(method["return_type"]) + ") "
                elif return_type_is_ref:
                    return_statement += "return Ref<" + strip_name(method["return_type"]) + ">::__internal_constructor("
                else:
                    return_statement += "return " + (
                        "(" + strip_name(method["return_type"]) + " *) " if is_class_type(method["return_type"]) else ""
                    )
            else:
                return_statement += "return "

        def get_icall_type_name(name):
            if is_enum(name):
                return "int"
            if is_class_type(name):
                return "Object"
            return name

        if method["has_varargs"]:

            if len(method["arguments"]) != 0:
                source.append("\tVariant __given_args[" + str(len(method["arguments"])) + "];")

            for i, argument in enumerate(method["arguments"]):
                source.append("\tPandemonium::api->pandemonium_variant_new_nil((pandemonium_variant *) &__given_args[" + str(i) + "]);")

            source.append("")

            for i, argument in enumerate(method["arguments"]):
                source.append("\t__given_args[" + str(i) + "] = " + escape_cpp(argument["name"]) + ";")

            source.append("")

            size = ""
            if method["has_varargs"]:
                size = "(__var_args.size() + " + str(len(method["arguments"])) + ")"
            else:
                size = "(" + str(len(method["arguments"])) + ")"

            source.append(
                "\tpandemonium_variant **__args = (pandemonium_variant **) alloca(sizeof(pandemonium_variant *) * " + size + ");"
            )

            source.append("")

            for i, argument in enumerate(method["arguments"]):
                source.append("\t__args[" + str(i) + "] = (pandemonium_variant *) &__given_args[" + str(i) + "];")

            source.append("")

            if method["has_varargs"]:
                source.append("\tfor (int i = 0; i < __var_args.size(); i++) {")
                source.append(
                    "\t\t__args[i + "
                    + str(len(method["arguments"]))
                    + "] = (pandemonium_variant *) &((Array &) __var_args)[i];"
                )
                source.append("\t}")

            source.append("")

            source.append("\tVariant __result;")
            source.append(
                "\t*(pandemonium_variant *) &__result = Pandemonium::api->pandemonium_method_bind_call(___mb.mb_"
                + method["name"]
                + ", ((const Object *) "
                + core_object_name
                + ")->_owner, (const pandemonium_variant **) __args, "
                + size
                + ", nullptr);"
            )

            source.append("")

            if is_class_type(method["return_type"]):
                source.append("\tObject *obj = Object::___get_from_variant(__result);")
                source.append('\tif (obj->has_method("reference"))')
                source.append('\t\tobj->callv("reference", Array());')

                source.append("")

            for i, argument in enumerate(method["arguments"]):
                source.append("\tPandemonium::api->pandemonium_variant_destroy((pandemonium_variant *) &__given_args[" + str(i) + "]);")

            source.append("")

            if method["return_type"] != "void":
                cast = ""
                if is_class_type(method["return_type"]):
                    if return_type_is_ref:
                        cast += "Ref<" + strip_name(method["return_type"]) + ">::__internal_constructor(__result);"
                    else:
                        cast += (
                            "("
                            + strip_name(method["return_type"])
                            + " *) "
                            + strip_name(method["return_type"] + "::___get_from_variant(")
                            + "__result);"
                        )
                else:
                    cast += "__result;"
                source.append("\treturn " + cast)

        else:

            args = []
            for arg in method["arguments"]:
                args.append(get_icall_type_name(arg["type"]))

            icall_ret_type = get_icall_type_name(method["return_type"])

            icall_sig = tuple((icall_ret_type, tuple(args)))

            icalls.add(icall_sig)

            icall_name = get_icall_name(icall_sig)

            return_statement += icall_name + "(___mb.mb_" + method["name"] + ", (const Object *) " + core_object_name

            for arg in method["arguments"]:
                arg_is_ref = is_reference_type(arg["type"]) and ref_allowed
                return_statement += ", " + escape_cpp(arg["name"]) + (".ptr()" if arg_is_ref else "")

            return_statement += ")"

            if return_type_is_ref:
                return_statement += ")"

            source.append("\t" + return_statement + ";")

        source.append("}")
        source.append("")

    return "\n".join(source)


def generate_icall_header(icalls):

    source = []
    source.append("#ifndef PANDEMONIUM_CPP__ICALLS_H")
    source.append("#define PANDEMONIUM_CPP__ICALLS_H")

    source.append("")

    source.append("#include <gdnative_api_struct.gen.h>")
    source.append("#include <stdint.h>")
    source.append("")

    source.append("#include <core/pandemonium_global.h>")
    source.append("#include <core/core_types.h>")
    source.append('#include "object.h"')
    source.append("")
    source.append("")

    source.append("")

    for icall in icalls:
        ret_type = icall[0]
        args = icall[1]

        method_signature = "static inline "

        method_signature += (
            get_icall_return_type(ret_type) + get_icall_name(icall) + "(pandemonium_method_bind *mb, const Object *inst"
        )

        for i, arg in enumerate(args):
            method_signature += ", const "

            if is_core_type(arg):
                method_signature += arg + "&"
            elif arg == "int":
                method_signature += "int64_t "
            elif arg == "float":
                method_signature += "double "
            elif is_primitive(arg):
                method_signature += arg + " "
            else:
                method_signature += "Object *"

            method_signature += "arg" + str(i)

        method_signature += ")"

        source.append(method_signature + " {")

        if ret_type != "void":
            source.append(
                "\t" + ("pandemonium_object *" if is_class_type(ret_type) else get_icall_return_type(ret_type)) + "ret;"
            )
            if is_class_type(ret_type):
                source.append("\tret = nullptr;")

        source.append("\tconst void *args[" + ("1" if len(args) == 0 else "") + "] = {")

        for i, arg in enumerate(args):

            wrapped_argument = "\t\t"
            if is_primitive(arg) or is_core_type(arg):
                wrapped_argument += "(void *) &arg" + str(i)
            else:
                wrapped_argument += "(void *) (arg" + str(i) + ") ? arg" + str(i) + "->_owner : nullptr"

            wrapped_argument += ","
            source.append(wrapped_argument)

        source.append("\t};")
        source.append("")

        source.append(
            "\tPandemonium::api->pandemonium_method_bind_ptrcall(mb, inst->_owner, args, "
            + ("nullptr" if ret_type == "void" else "&ret")
            + ");"
        )

        if ret_type != "void":
            if is_class_type(ret_type):
                source.append("\tif (ret) {")
                source.append(
                    "\t\treturn (Object *) Pandemonium::nativescript_api->pandemonium_nativescript_get_instance_binding_data(_RegisterState::language_index, ret);"
                )
                source.append("\t}")
                source.append("")
                source.append("\treturn (Object *) ret;")
            else:
                source.append("\treturn ret;")

        source.append("}")
        source.append("")

    source.append("")

    source.append("#endif")

    return "\n".join(source)


def generate_type_registry(classes):
    source = []

    source.append('#include "tag_db.h"')
    source.append("#include <typeinfo>")
    source.append("\n")

    for c in classes:
        source.append("#include <" + class_name_to_file_name(strip_name(c["name"])) + ".h>")

    source.append("")
    source.append("")

    source.append("void ___register_types()")
    source.append("{")

    for c in classes:
        class_name = strip_name(c["name"])
        base_class_name = strip_name(c["base_class"])

        class_type_hash = "typeid(" + class_name + ").hash_code()"

        base_class_type_hash = "typeid(" + base_class_name + ").hash_code()"

        if base_class_name == "":
            base_class_type_hash = "0"

        source.append(
            '\t_TagDB::register_global_type("'
            + c["name"]
            + '", '
            + class_type_hash
            + ", "
            + base_class_type_hash
            + ");"
        )

    source.append("}")

    source.append("")

    return "\n".join(source)


def generate_init_method_bindings(classes):
    source = []

    for c in classes:
        source.append("#include <" + class_name_to_file_name(strip_name(c["name"])) + ".h>")

    source.append("")
    source.append("")

    source.append("void ___init_method_bindings()")
    source.append("{")

    for c in classes:
        source.append("\t" + strip_name(c["name"]) + "::___init_method_bindings();")

    source.append("}")

    source.append("")

    return "\n".join(source)


def get_icall_return_type(t):
    if is_class_type(t):
        return "Object *"
    if t == "int":
        return "int64_t "
    if t == "float" or t == "real":
        return "double "
    return t + " "


def get_icall_name(sig):
    ret_type = sig[0]
    args = sig[1]

    name = "___pandemonium_icall_"
    name += strip_name(ret_type)
    for arg in args:
        name += "_" + strip_name(arg)

    return name


def get_used_classes(c):
    classes = []
    for method in c["methods"]:
        if is_class_type(method["return_type"]) and not (method["return_type"] in classes):
            classes.append(method["return_type"])

        for arg in method["arguments"]:
            if is_class_type(arg["type"]) and not (arg["type"] in classes):
                classes.append(arg["type"])
    return classes


def strip_name(name):
    if len(name) == 0:
        return name
    if name[0] == "_":
        return name[1:]
    return name


def extract_nested_type(nested_type):
    return strip_name(nested_type[: nested_type.find("::")])


def remove_nested_type_prefix(name):
    return name if name.find("::") == -1 else strip_name(name[name.find("::") + 2 :])


def remove_enum_prefix(name):
    return strip_name(name[name.find("enum.") + 5 :])


def is_nested_type(name, type=""):
    return name.find(type + "::") != -1


def is_enum(name):
    return name.find("enum.") == 0


def is_class_type(name):
    return not is_core_type(name) and not is_primitive(name)


def is_core_type(name):
    core_types = [
        "String",
        "Rect2",
        "Rect2i",
        "Vector2",
        "Vector2i",
        "Vector3",
        "Vector3i",
        "Vector4",
        "Vector4i",
        "Plane",
        "Quaternion",
        "AABB",
        "Basis",
        "Transform",
        "Transform2D",
        "Projection",
        "Color",
        "NodePath",
        "RID",
#       Object
        "StringName",
        "Dictionary",
        "Array",
        "PoolByteArray",
        "PoolIntArray",
        "PoolRealArray",
        "PoolStringArray",
        "PoolVector2Array",
        "PoolVector2iArray",
        "PoolVector3Array",
        "PoolVector3iArray",
        "PoolVector4Array",
        "PoolVector4iArray",
        "PoolColorArray",
        "Error",
        "Variant",
    ]
    return name in core_types


def is_primitive(name):
    core_types = ["int", "bool", "real", "float", "void"]
    return name in core_types


def escape_cpp(name):
    escapes = {
        "class": "_class",
        "enum": "_enum",
        "char": "_char",
        "short": "_short",
        "bool": "_bool",
        "int": "_int",
        "default": "_default",
        "case": "_case",
        "switch": "_switch",
        "export": "_export",
        "template": "_template",
        "new": "new_",
        "operator": "_operator",
        "typename": "_typename",
    }
    if name in escapes:
        return escapes[name]
    return name