97132ece33
* feat: add gin_helper::FromV8WithLookup() feat: add gin_helper::FromV8WithLowerLookup() * refactor: use constexpr lookup table in gin Converters
274 lines
8.4 KiB
C++
274 lines
8.4 KiB
C++
// Copyright (c) 2019 GitHub, Inc.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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#ifndef ELECTRON_SHELL_COMMON_GIN_CONVERTERS_STD_CONVERTER_H_
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#define ELECTRON_SHELL_COMMON_GIN_CONVERTERS_STD_CONVERTER_H_
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#include <cstddef>
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#include <functional>
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#include <map>
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#include <set>
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#include <type_traits>
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#include <utility>
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#include "gin/converter.h"
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#include "base/strings/string_util.h"
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#if BUILDFLAG(IS_WIN)
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#include "base/strings/string_util_win.h"
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#endif
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namespace gin {
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// Make it possible to convert move-only types.
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template <typename T>
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v8::Local<v8::Value> ConvertToV8(v8::Isolate* isolate, T&& input) {
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return Converter<typename std::remove_reference<T>::type>::ToV8(
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isolate, std::forward<T>(input));
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}
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#if !BUILDFLAG(IS_LINUX)
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template <>
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struct Converter<unsigned long> { // NOLINT(runtime/int)
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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unsigned long val) { // NOLINT(runtime/int)
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return v8::Integer::New(isolate, val);
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}
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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unsigned long* out) { // NOLINT(runtime/int)
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auto maybe = val->IntegerValue(isolate->GetCurrentContext());
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if (maybe.IsNothing())
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return false;
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*out = maybe.FromJust();
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return true;
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}
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};
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#endif
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template <>
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struct Converter<std::nullptr_t> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate, std::nullptr_t val) {
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return v8::Null(isolate);
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}
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};
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template <>
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struct Converter<const char*> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate, const char* val) {
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return v8::String::NewFromUtf8(isolate, val, v8::NewStringType::kNormal)
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.ToLocalChecked();
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}
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};
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template <>
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struct Converter<char[]> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate, const char* val) {
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return v8::String::NewFromUtf8(isolate, val, v8::NewStringType::kNormal)
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.ToLocalChecked();
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}
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};
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template <size_t n>
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struct Converter<char[n]> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate, const char* val) {
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return v8::String::NewFromUtf8(isolate, val, v8::NewStringType::kNormal,
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n - 1)
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.ToLocalChecked();
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}
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};
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template <>
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struct Converter<v8::Local<v8::Array>> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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v8::Local<v8::Array> val) {
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return val;
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}
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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v8::Local<v8::Array>* out) {
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if (!val->IsArray())
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return false;
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*out = val.As<v8::Array>();
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return true;
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}
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};
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template <>
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struct Converter<v8::Local<v8::String>> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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v8::Local<v8::String> val) {
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return val;
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}
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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v8::Local<v8::String>* out) {
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if (!val->IsString())
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return false;
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*out = val.As<v8::String>();
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return true;
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}
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};
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template <typename T>
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struct Converter<std::set<T>> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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const std::set<T>& val) {
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v8::Local<v8::Array> result(
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v8::Array::New(isolate, static_cast<int>(val.size())));
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auto context = isolate->GetCurrentContext();
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typename std::set<T>::const_iterator it;
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int i;
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for (i = 0, it = val.begin(); it != val.end(); ++it, ++i)
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result->Set(context, i, Converter<T>::ToV8(isolate, *it)).Check();
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return result;
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}
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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std::set<T>* out) {
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if (!val->IsArray())
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return false;
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auto context = isolate->GetCurrentContext();
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std::set<T> result;
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v8::Local<v8::Array> array = val.As<v8::Array>();
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uint32_t length = array->Length();
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for (uint32_t i = 0; i < length; ++i) {
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T item;
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if (!Converter<T>::FromV8(isolate,
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array->Get(context, i).ToLocalChecked(), &item))
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return false;
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result.insert(item);
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}
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out->swap(result);
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return true;
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}
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};
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template <typename K, typename V>
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struct Converter<std::map<K, V>> {
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> value,
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std::map<K, V>* out) {
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if (!value->IsObject())
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return false;
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out->clear();
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v8::Local<v8::Context> context = isolate->GetCurrentContext();
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v8::Local<v8::Object> obj = value.As<v8::Object>();
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v8::Local<v8::Array> keys = obj->GetPropertyNames(context).ToLocalChecked();
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for (uint32_t i = 0; i < keys->Length(); ++i) {
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v8::MaybeLocal<v8::Value> maybe_v8key = keys->Get(context, i);
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if (maybe_v8key.IsEmpty())
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return false;
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v8::Local<v8::Value> v8key = maybe_v8key.ToLocalChecked();
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v8::MaybeLocal<v8::Value> maybe_v8value = obj->Get(context, v8key);
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if (maybe_v8value.IsEmpty())
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return false;
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K key;
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V out_value;
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if (!ConvertFromV8(isolate, v8key, &key) ||
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!ConvertFromV8(isolate, maybe_v8value.ToLocalChecked(), &out_value))
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return false;
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(*out)[key] = std::move(out_value);
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}
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return true;
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}
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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const std::map<K, V>& dict) {
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v8::Local<v8::Object> obj = v8::Object::New(isolate);
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v8::Local<v8::Context> context = isolate->GetCurrentContext();
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for (const auto& it : dict) {
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if (obj->Set(context, ConvertToV8(isolate, it.first),
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ConvertToV8(isolate, it.second))
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.IsNothing())
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break;
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}
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return obj;
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}
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};
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#if BUILDFLAG(IS_WIN)
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template <>
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struct Converter<std::wstring> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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const std::wstring& val) {
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return Converter<std::u16string>::ToV8(isolate, base::AsString16(val));
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}
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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std::wstring* out) {
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if (!val->IsString())
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return false;
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std::u16string str;
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if (Converter<std::u16string>::FromV8(isolate, val, &str)) {
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*out = base::AsWString(str);
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return true;
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} else {
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return false;
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}
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}
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};
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#endif
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namespace detail {
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// Get a key from `key_val` and check `lookup` for a matching entry.
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// Return true iff a match is found, and set `*out` to the entry's value.
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template <typename KeyType, typename Out, typename Map>
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bool FromV8WithLookup(v8::Isolate* isolate,
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v8::Local<v8::Value> key_val,
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const Map& table,
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Out* out,
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std::function<void(KeyType&)> key_transform = {}) {
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static_assert(std::is_same_v<typename Map::mapped_type, Out>);
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auto key = KeyType{};
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if (!ConvertFromV8(isolate, key_val, &key))
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return false;
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if (key_transform)
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key_transform(key);
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if (const auto* iter = table.find(key); iter != table.end()) {
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*out = iter->second;
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return true;
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}
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return false;
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}
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} // namespace detail
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// Convert `key_val to a string key and check `lookup` for a matching entry.
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// Return true iff a match is found, and set `*out` to the entry's value.
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template <typename Out, typename Map>
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bool FromV8WithLookup(v8::Isolate* isolate,
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v8::Local<v8::Value> key_val,
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const Map& table,
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Out* out) {
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return detail::FromV8WithLookup<std::string>(isolate, key_val, table, out);
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}
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// Convert `key_val` to a lowercase string key and check `lookup` for a matching
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// entry. Return true iff a match is found, and set `*out` to the entry's value.
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template <typename Out, typename Map>
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bool FromV8WithLowerLookup(v8::Isolate* isolate,
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v8::Local<v8::Value> key_val,
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const Map& table,
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Out* out) {
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static constexpr auto to_lower_ascii_inplace = [](std::string& str) {
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for (auto& ch : str)
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ch = base::ToLowerASCII(ch);
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};
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return detail::FromV8WithLookup<std::string>(isolate, key_val, table, out,
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to_lower_ascii_inplace);
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}
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} // namespace gin
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#endif // ELECTRON_SHELL_COMMON_GIN_CONVERTERS_STD_CONVERTER_H_
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