347 lines
9.4 KiB
C++
347 lines
9.4 KiB
C++
// Copyright 2004-present Facebook. All Rights Reserved.
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#pragma once
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#include <memory>
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#include <sstream>
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#include <unordered_map>
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#include <vector>
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#include <folly/dynamic.h>
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#include <jschelpers/JavaScriptCore.h>
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#include <jschelpers/Unicode.h>
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#include <jschelpers/noncopyable.h>
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#ifndef RN_EXPORT
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#define RN_EXPORT __attribute__((visibility("default")))
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#endif
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namespace facebook {
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namespace react {
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class Value;
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// C++ object wrapper for JSStringRef
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class String : public noncopyable {
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public:
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explicit String(): m_context(nullptr), m_string(nullptr) {} // dummy empty constructor
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explicit String(JSContextRef context, const char* utf8)
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: m_context(context), m_string(JSC_JSStringCreateWithUTF8CString(context, utf8)) {}
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String(String&& other) :
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m_context(other.m_context), m_string(other.m_string)
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{
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other.m_string = nullptr;
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}
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String(const String& other) :
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m_context(other.m_context), m_string(other.m_string)
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{
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if (m_string) {
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JSC_JSStringRetain(m_context, m_string);
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}
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}
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~String() {
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if (m_string) {
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JSC_JSStringRelease(m_context, m_string);
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}
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}
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String& operator=(String&& other) {
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if (m_string) {
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JSC_JSStringRelease(m_context, m_string);
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}
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m_context = other.m_context;
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m_string = other.m_string;
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other.m_string = nullptr;
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return *this;
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}
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operator JSStringRef() const {
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return m_string;
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}
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JSContextRef context() const {
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return m_context;
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}
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// Length in characters
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size_t length() const {
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return m_string ? JSC_JSStringGetLength(m_context, m_string) : 0;
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}
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// Length in bytes of a nul-terminated utf8 encoded value
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size_t utf8Size() const {
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return m_string ? JSC_JSStringGetMaximumUTF8CStringSize(m_context, m_string) : 0;
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}
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/*
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* JavaScriptCore is built with strict utf16 -> utf8 conversion.
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* This means if JSC's built-in conversion function encounters a JavaScript
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* string which contains half of a 32-bit UTF-16 symbol, it produces an error
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* rather than returning a string.
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*
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* Instead of relying on this, we use our own utf16 -> utf8 conversion function
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* which is more lenient and always returns a string. When an invalid UTF-16
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* string is provided, it'll likely manifest as a rendering glitch in the app for
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* the invalid symbol.
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*
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* For details on JavaScript's unicode support see:
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* https://mathiasbynens.be/notes/javascript-unicode
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*/
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std::string str() const {
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if (!m_string) {
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return "";
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}
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const JSChar* utf16 = JSC_JSStringGetCharactersPtr(m_context, m_string);
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size_t stringLength = JSC_JSStringGetLength(m_context, m_string);
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return unicode::utf16toUTF8(utf16, stringLength);
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}
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// Assumes that utf8 is nul-terminated
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bool equals(const char* utf8) {
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return m_string ? JSC_JSStringIsEqualToUTF8CString(m_context, m_string, utf8) : false;
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}
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// This assumes ascii is nul-terminated.
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static String createExpectingAscii(JSContextRef context, const char* ascii, size_t len) {
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#if WITH_FBJSCEXTENSIONS
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return String(context, JSC_JSStringCreateWithUTF8CStringExpectAscii(context, ascii, len), true);
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#else
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return String(context, JSC_JSStringCreateWithUTF8CString(context, ascii), true);
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#endif
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}
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static String createExpectingAscii(JSContextRef context, std::string const &ascii) {
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return createExpectingAscii(context, ascii.c_str(), ascii.size());
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}
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// Creates a String wrapper and increases the refcount of the JSStringRef
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static String ref(JSContextRef context, JSStringRef string) {
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return String(context, string, false);
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}
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// Creates a String wrapper that takes over ownership of the string. The
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// JSStringRef passed in must previously have been created or retained.
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static String adopt(JSContextRef context, JSStringRef string) {
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return String(context, string, true);
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}
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private:
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explicit String(JSContextRef context, JSStringRef string, bool adopt) :
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m_context(context), m_string(string)
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{
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if (!adopt && string) {
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JSC_JSStringRetain(context, string);
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}
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}
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JSContextRef m_context;
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JSStringRef m_string;
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};
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// C++ object wrapper for JSObjectRef. The underlying JSObjectRef can be
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// optionally protected. You must protect the object if it is ever
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// heap-allocated, since otherwise you may end up with an invalid reference.
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class Object : public noncopyable {
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public:
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Object(JSContextRef context, JSObjectRef obj) :
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m_context(context),
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m_obj(obj)
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{}
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Object(Object&& other) :
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m_context(other.m_context),
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m_obj(other.m_obj),
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m_isProtected(other.m_isProtected) {
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other.m_obj = nullptr;
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other.m_isProtected = false;
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}
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~Object() {
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if (m_isProtected && m_obj) {
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JSC_JSValueUnprotect(m_context, m_obj);
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}
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}
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Object& operator=(Object&& other) {
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std::swap(m_context, other.m_context);
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std::swap(m_obj, other.m_obj);
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std::swap(m_isProtected, other.m_isProtected);
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return *this;
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}
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operator JSObjectRef() const {
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return m_obj;
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}
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operator Value() const;
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bool isFunction() const {
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return JSC_JSObjectIsFunction(m_context, m_obj);
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}
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Value callAsFunction(std::initializer_list<JSValueRef> args) const;
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Value callAsFunction(const Object& thisObj, std::initializer_list<JSValueRef> args) const;
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Value callAsFunction(int nArgs, const JSValueRef args[]) const;
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Value callAsFunction(const Object& thisObj, int nArgs, const JSValueRef args[]) const;
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Object callAsConstructor(std::initializer_list<JSValueRef> args) const;
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Value getProperty(const String& propName) const;
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Value getProperty(const char *propName) const;
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Value getPropertyAtIndex(unsigned int index) const;
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void setProperty(const String& propName, const Value& value);
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void setProperty(const char *propName, const Value& value);
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void setPropertyAtIndex(unsigned int index, const Value& value);
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std::vector<String> getPropertyNames() const;
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std::unordered_map<std::string, std::string> toJSONMap() const;
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void makeProtected() {
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if (!m_isProtected && m_obj) {
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JSC_JSValueProtect(m_context, m_obj);
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m_isProtected = true;
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}
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}
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template<typename ReturnType>
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ReturnType* getPrivate() const {
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const bool isCustomJSC = isCustomJSCPtr(m_context);
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return static_cast<ReturnType*>(JSC_JSObjectGetPrivate(isCustomJSC, m_obj));
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}
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void setPrivate(void* data) const {
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const bool isCustomJSC = isCustomJSCPtr(m_context);
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JSC_JSObjectSetPrivate(isCustomJSC, m_obj, data);
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}
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JSContextRef context() const {
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return m_context;
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}
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static Object getGlobalObject(JSContextRef ctx) {
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auto globalObj = JSC_JSContextGetGlobalObject(ctx);
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return Object(ctx, globalObj);
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}
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/**
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* Creates an instance of the default object class.
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*/
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static Object create(JSContextRef ctx);
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private:
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JSContextRef m_context;
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JSObjectRef m_obj;
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bool m_isProtected = false;
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Value callAsFunction(JSObjectRef thisObj, int nArgs, const JSValueRef args[]) const;
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};
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// C++ object wrapper for JSValueRef. The underlying JSValueRef is not
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// protected, so this class should always be used as a stack-allocated
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// variable.
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class Value : public noncopyable {
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public:
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RN_EXPORT Value(JSContextRef context, JSValueRef value);
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RN_EXPORT Value(JSContextRef context, JSStringRef value);
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RN_EXPORT Value(const Value &o) : Value(o.m_context, o.m_value) {}
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RN_EXPORT Value(const String &o) : Value(o.context(), o) {}
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Value& operator=(Value&& other) {
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m_context = other.m_context;
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m_value = other.m_value;
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other.m_value = NULL;
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return *this;
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};
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operator JSValueRef() const {
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return m_value;
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}
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JSType getType() const {
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return JSC_JSValueGetType(m_context, m_value);
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}
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bool isBoolean() const {
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return getType() == kJSTypeBoolean;
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}
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bool asBoolean() const {
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return JSC_JSValueToBoolean(context(), m_value);
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}
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bool isNumber() const {
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return getType() == kJSTypeNumber;
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}
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bool isNull() const {
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return getType() == kJSTypeNull;
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}
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bool isUndefined() const {
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return getType() == kJSTypeUndefined;
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}
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double asNumber() const {
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if (isNumber()) {
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return JSC_JSValueToNumber(context(), m_value, nullptr);
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} else {
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return 0.0f;
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}
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}
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int32_t asInteger() const {
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return static_cast<int32_t>(asNumber());
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}
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uint32_t asUnsignedInteger() const {
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return static_cast<uint32_t>(asNumber());
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}
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bool isObject() const {
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return getType() == kJSTypeObject;
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}
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RN_EXPORT Object asObject() const;
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bool isString() const {
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return getType() == kJSTypeString;
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}
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RN_EXPORT String toString() const;
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// Create an error, optionally adding an additional number of lines to the stack.
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// Stack must be empty or newline terminated.
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RN_EXPORT static Value makeError(JSContextRef ctx, const char *error, const char *stack = nullptr);
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static Value makeNumber(JSContextRef ctx, double value) {
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return Value(ctx, JSC_JSValueMakeNumber(ctx, value));
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}
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static Value makeUndefined(JSContextRef ctx) {
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return Value(ctx, JSC_JSValueMakeUndefined(ctx));
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}
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static Value makeNull(JSContextRef ctx) {
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return Value(ctx, JSC_JSValueMakeNull(ctx));
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}
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RN_EXPORT std::string toJSONString(unsigned indent = 0) const;
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RN_EXPORT static Value fromJSON(const String& json);
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RN_EXPORT static Value fromDynamic(JSContextRef ctx, const folly::dynamic& value);
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RN_EXPORT JSContextRef context() const;
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private:
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JSContextRef m_context;
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JSValueRef m_value;
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static JSValueRef fromDynamicInner(JSContextRef ctx, const folly::dynamic& obj);
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};
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} }
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