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1#ifndef AWS_CRT_NODEJS_CLASS_BINDER_H2#define AWS_CRT_NODEJS_CLASS_BINDER_H3/**4 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.5 * SPDX-License-Identifier: Apache-2.0.6 */7 8#include "module.h"9 10/* Increment this as you find functions that require more arguments */11#define AWS_NAPI_METHOD_MAX_ARGS 912 13/**14 * Expected to be stored statically, but is for internal usage only.15 */16struct aws_napi_class_info {17    uint8_t filler[40];18};19 20/**21 * Passed as a parameter to functions accepting arguments.22 */23struct aws_napi_argument {24    napi_value node;25    napi_valuetype type;26    union {27        bool boolean;28        int64_t number;29        struct aws_byte_buf string;30        void *external;31    } native;32};33 34/**35 * Passed to methods36 */37struct aws_napi_callback_info {38    napi_value node_this;39    void *native_this;40    const struct aws_napi_argument *arguments;41    size_t num_args;42};43 44/***********************************************************************************************************************45 * Properties46 **********************************************************************************************************************/47typedef napi_value(aws_napi_property_get_fn)(napi_env env, void *native_this);48typedef void(aws_napi_property_set_fn)(napi_env env, void *native_this, const struct aws_napi_argument *value);49 50struct aws_napi_property_info {51    const char *name;52    const char *symbol;53    napi_valuetype type;54 55    aws_napi_property_get_fn *getter;56    aws_napi_property_set_fn *setter;57 58    napi_property_attributes attributes;59};60 61/***********************************************************************************************************************62 * Methods63 **********************************************************************************************************************/64typedef napi_value(aws_napi_method_fn)(napi_env env, const struct aws_napi_callback_info *cb_info);65 66struct aws_napi_method_info {67    const char *name;68    const char *symbol;69    aws_napi_method_fn *method;70 71    size_t num_arguments; /* Number of *REQUIRED* arguments. 0 -> AWS_NAPI_METHOD_MAX_ARGS */72    napi_valuetype arg_types[AWS_NAPI_METHOD_MAX_ARGS];73 74    napi_property_attributes attributes;75};76 77/***********************************************************************************************************************78 * API79 **********************************************************************************************************************/80 81bool aws_napi_method_next_argument(82    napi_valuetype expected_type,83    const struct aws_napi_callback_info *cb_info,84    const struct aws_napi_argument **next_arg);85 86napi_status aws_napi_define_class(87    napi_env env,88    napi_value exports,89    const struct aws_napi_method_info *constructor,90    const struct aws_napi_property_info *properties,91    size_t num_properties,92    const struct aws_napi_method_info *methods,93    size_t num_methods,94    struct aws_napi_class_info *class_info);95 96/* The constructor comes from class info will wrap the native object.97 * Thus, the finalizer will be invoked with native as98 * the finalize_data and class_info as the finalize_hint */99napi_status aws_napi_wrap(100    napi_env env,101    struct aws_napi_class_info *class_info,102    void *native,103    napi_finalize finalizer,104    napi_value *result);105 106napi_status aws_napi_define_function(napi_env env, napi_value exports, struct aws_napi_method_info *method);107 108#endif /* AWS_CRT_NODEJS_CLASS_BINDER_H */109