Martchus
daf1a8602c
So helper methods for other applications of reflections would go into a separate namespace to prevent conflicts.
122 lines
4.8 KiB
C++
122 lines
4.8 KiB
C++
#include "./jsonserializationcodegenerator.h"
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#include "../lib/json/serializable.h"
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#include <clang/AST/DeclCXX.h>
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#include <iostream>
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using namespace std;
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namespace ReflectiveRapidJSON {
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/*!
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* \brief Prints an LLVM string reference without instantiating a std::string first.
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*/
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ostream &operator<<(ostream &os, llvm::StringRef str)
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{
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os.write(str.data(), static_cast<streamsize>(str.size()));
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return os;
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}
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void JsonSerializationCodeGenerator::addDeclaration(clang::Decl *decl)
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{
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switch (decl->getKind()) {
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case clang::Decl::Kind::CXXRecord: {
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auto *const record = static_cast<clang::CXXRecordDecl *>(decl);
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// skip forward declarations
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if (!record->hasDefinition()) {
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return;
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}
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// add classes derived from any instantiation of "ReflectiveRapidJSON::JsonSerializable"
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if (inheritsFromInstantiationOf(record, JsonSerializable<void>::qualifiedName)) {
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m_relevantClasses.emplace_back(record->getQualifiedNameAsString(), record);
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}
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break;
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}
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case clang::Decl::Kind::Enum:
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// TODO: add enums
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break;
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default:;
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}
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}
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void JsonSerializationCodeGenerator::generate(ostream &os) const
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{
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if (m_relevantClasses.empty()) {
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return;
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}
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// put everything into namespace ReflectiveRapidJSON::JsonReflector
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os << "namespace ReflectiveRapidJSON {\n"
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"namespace JsonReflector {\n\n";
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// add push and pull functions for each class, for an example of the resulting
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// output, see ../lib/tests/jsonserializable.cpp (code under comment "pretend serialization code...")
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for (const RelevantClass &relevantClass : m_relevantClasses) {
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// write comment
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os << "// define code for (de)serializing " << relevantClass.qualifiedName << " objects\n";
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// find relevant base classes
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const vector<const RelevantClass *> relevantBases = findRelevantBaseClasses(relevantClass);
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// print push method
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os << "template <> inline void push<::" << relevantClass.qualifiedName << ">(const ::" << relevantClass.qualifiedName
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<< " &reflectable, ::RAPIDJSON_NAMESPACE::Value::Object &value, ::RAPIDJSON_NAMESPACE::Document::AllocatorType &allocator)\n{\n"
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" // push base classes\n";
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for (const RelevantClass *baseClass : relevantBases) {
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os << " push(static_cast<const ::" << baseClass->qualifiedName << " &>(reflectable), value, allocator);\n";
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}
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os << " // push members\n";
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for (const clang::FieldDecl *field : relevantClass.record->fields()) {
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os << " push(reflectable." << field->getName() << ", \"" << field->getName() << "\", value, allocator);\n";
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}
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os << "}\n";
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// print pull method
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os << "template <> inline void pull<::" << relevantClass.qualifiedName << ">(::" << relevantClass.qualifiedName
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<< " &reflectable, const ::RAPIDJSON_NAMESPACE::GenericValue<::RAPIDJSON_NAMESPACE::UTF8<char>>::ConstObject &value, "
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"JsonDeserializationErrors "
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"*errors)\n{\n"
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" // pull base classes\n";
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for (const RelevantClass *baseClass : relevantBases) {
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os << " pull(static_cast<::" << baseClass->qualifiedName << " &>(reflectable), value, errors);\n";
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}
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os << " // set error context for current record\n"
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" const char *previousRecord;\n"
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" if (errors) {\n"
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" previousRecord = errors->currentRecord;\n"
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" errors->currentRecord = \""
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<< relevantClass.qualifiedName
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<< "\";\n"
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" }\n"
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" // pull members\n";
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for (const clang::FieldDecl *field : relevantClass.record->fields()) {
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os << " pull(reflectable." << field->getName() << ", \"" << field->getName() << "\", value, errors);\n";
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}
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os << " // restore error context for previous record\n"
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" if (errors) {\n"
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" errors->currentRecord = previousRecord;\n"
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" }\n";
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os << "}\n\n";
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}
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// close namespace ReflectiveRapidJSON::JsonReflector
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os << "} // namespace JsonReflector\n"
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"} // namespace ReflectiveRapidJSON\n";
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}
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std::vector<const JsonSerializationCodeGenerator::RelevantClass *> JsonSerializationCodeGenerator::findRelevantBaseClasses(
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const RelevantClass &relevantClass) const
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{
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vector<const RelevantClass *> relevantBaseClasses;
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for (const RelevantClass &otherClass : m_relevantClasses) {
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if (relevantClass.record != otherClass.record && relevantClass.record->isDerivedFrom(otherClass.record)) {
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relevantBaseClasses.push_back(&otherClass);
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}
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}
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return relevantBaseClasses;
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}
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} // namespace ReflectiveRapidJSON
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