121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <folly/dynamic.h>
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namespace facebook {
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namespace xplat {
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namespace detail {
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template <typename R, typename M, typename... T>
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R jsArg1(const folly::dynamic &arg, M asFoo, const T &...desc) {
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try {
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return (arg.*asFoo)();
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} catch (const folly::TypeError &ex) {
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throw JsArgumentException(folly::to<std::string>(
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"Error converting javascript arg ", desc..., " to C++: ", ex.what()));
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} catch (const std::range_error &ex) {
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throw JsArgumentException(folly::to<std::string>(
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"Could not convert argument ",
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desc...,
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" to required type: ",
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ex.what()));
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}
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}
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} // namespace detail
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template <typename R, typename... T>
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R jsArg(
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const folly::dynamic &arg,
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R (folly::dynamic::*asFoo)() const,
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const T &...desc) {
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return detail::jsArg1<R>(arg, asFoo, desc...);
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}
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template <typename R, typename... T>
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R jsArg(
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const folly::dynamic &arg,
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R (folly::dynamic::*asFoo)() const &,
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const T &...desc) {
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return detail::jsArg1<R>(arg, asFoo, desc...);
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}
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template <typename T>
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// NOLINTNEXTLINE (T62192316)
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typename detail::is_dynamic<T>::type &jsArgAsDynamic(T &&args, size_t n) {
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try {
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return args[n];
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} catch (const std::out_of_range &ex) {
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// Use 1-base counting for argument description.
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throw JsArgumentException(folly::to<std::string>(
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"JavaScript provided ",
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args.size(),
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" arguments for C++ method which references at least ",
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n + 1,
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" arguments: ",
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ex.what()));
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}
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}
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template <typename R>
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R jsArgN(
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const folly::dynamic &args,
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size_t n,
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R (folly::dynamic::*asFoo)() const) {
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return jsArg(jsArgAsDynamic(args, n), asFoo, n);
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}
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template <typename R>
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R jsArgN(
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const folly::dynamic &args,
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size_t n,
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R (folly::dynamic::*asFoo)() const &) {
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return jsArg(jsArgAsDynamic(args, n), asFoo, n);
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}
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namespace detail {
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// This is a helper for jsArgAsArray and jsArgAsObject.
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template <typename T>
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typename detail::is_dynamic<T>::type &jsArgAsType(
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T &&args,
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size_t n,
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const char *required,
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bool (folly::dynamic::*isFoo)() const) {
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T &ret = jsArgAsDynamic(args, n);
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if ((ret.*isFoo)()) {
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return ret;
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}
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// Use 1-base counting for argument description.
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throw JsArgumentException(folly::to<std::string>(
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"Argument ",
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n + 1,
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" of type ",
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ret.typeName(),
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" is not required type ",
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required));
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}
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} // end namespace detail
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template <typename T>
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typename detail::is_dynamic<T>::type &jsArgAsArray(T &&args, size_t n) {
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return detail::jsArgAsType(args, n, "Array", &folly::dynamic::isArray);
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}
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template <typename T>
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typename detail::is_dynamic<T>::type &jsArgAsObject(T &&args, size_t n) {
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return detail::jsArgAsType(args, n, "Object", &folly::dynamic::isObject);
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}
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} // namespace xplat
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} // namespace facebook
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