378 lines
16 KiB
C++
378 lines
16 KiB
C++
#ifndef EOLIAN_MONO_EVENTS_HH
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#define EOLINA_MONO_EVENTS_HH
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#include <iterator>
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#include "grammar/generator.hpp"
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#include "grammar/klass_def.hpp"
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#include "type_impl.hh" // For call_match
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#include "name_helpers.hh"
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#include "using_decl.hh"
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namespace eolian_mono {
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template<typename OutputIterator, typename Context>
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struct unpack_event_args_visitor
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{
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mutable OutputIterator sink;
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Context const* context;
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attributes::type_def const& type;
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typedef unpack_event_args_visitor<OutputIterator, Context> visitor_type;
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typedef bool result_type;
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bool operator()(grammar::attributes::regular_type_def const& regular) const
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{
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std::string const& arg = "evt.Info";
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std::string arg_type = name_helpers::type_full_managed_name(regular);
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// Structs are usually passed by pointer to events, like having a ptr<> modifier
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if (type.is_ptr || regular.is_struct())
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return as_generator("(" + arg_type + ")Marshal.PtrToStructure(" + arg + ", typeof(" + arg_type + "))")
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.generate(sink, attributes::unused, *context);
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using attributes::regular_type_def;
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struct match
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{
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eina::optional<std::string> name;
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std::function<std::string()> function;
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}
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const match_table [] =
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{
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{"bool", [&arg] { return arg + " != IntPtr.Zero"; }}
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, {"int", [&arg] { return arg + ".ToInt32()"; }}
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, {"uint", [&arg] { return "(uint)" + arg + ".ToInt32()";}}
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, {"string", [&arg] { return "Eina.StringConversion.NativeUtf8ToManagedString(" + arg + ")"; }}
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, {"Eina.Error", [&arg] { return "(Eina.Error)Marshal.PtrToStructure(" + arg + ", typeof(Eina.Error))"; }}
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};
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std::string full_type_name = name_helpers::type_full_eolian_name(regular);
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auto filter_func = [®ular, &full_type_name] (match const& m)
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{
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return (!m.name || *m.name == regular.base_type || *m.name == full_type_name);
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};
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auto accept_func = [&](std::string const& conversion)
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{
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return as_generator(conversion).generate(sink, attributes::unused, *context);
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};
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if (eina::optional<bool> b = call_match(match_table, filter_func, accept_func))
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return *b;
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else
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return as_generator("default(" + arg_type + ")").generate(sink, attributes::unused, *context);
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}
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bool operator()(grammar::attributes::klass_name const& cls) const
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{
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return as_generator("new " + name_helpers::klass_full_concrete_name(cls) + "(evt.Info)").generate(sink, attributes::unused, *context);
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}
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bool operator()(attributes::complex_type_def const&) const
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{
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return as_generator("UNSUPPORTED").generate(sink, attributes::unused, *context);
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}
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};
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/*
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* Generates a struct wrapping the argument of a given event.
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*/
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struct event_argument_wrapper_generator
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{
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template<typename OutputIterator, typename Context>
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bool generate(OutputIterator sink, attributes::event_def const& evt, Context const& context) const
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{
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efl::eina::optional<grammar::attributes::type_def> etype = evt.type;
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if (!etype.is_engaged())
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return true;
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std::string evt_name = name_helpers::managed_event_name(evt.name);
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std::string arg_type;
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if (!as_generator(type).generate(std::back_inserter(arg_type), *etype, efl::eolian::grammar::context_null()))
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{
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EINA_CXX_DOM_LOG_ERR(eolian_mono::domain) << "Failed to get argument type for event " << evt.name;
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return false;
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}
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return as_generator("///<summary>Event argument wrapper for event " << evt_name << ".</summary>\n"
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<< "public class " << name_helpers::managed_event_args_short_name(evt) << " : EventArgs {\n"
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<< scope_tab << "///<summary>Actual event payload.</summary>\n"
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<< scope_tab << "public " << arg_type << " arg { get; set; }\n"
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<< "}\n"
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).generate(sink, attributes::unused, context);
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}
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} const event_argument_wrapper {};
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/*
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* Generates an event declaration as a C# Interface member.
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* In regular/abstract classes they are declared directly in their
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* implementation in event_definition_generator.
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*/
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struct event_declaration_generator
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{
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template<typename OutputIterator, typename Context>
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bool generate(OutputIterator sink, attributes::event_def const& evt, Context const& context) const
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{
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std::string wrapper_args_type;
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std::string evt_name = name_helpers::managed_event_name(evt.name);
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if (evt.type.is_engaged())
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wrapper_args_type = "<" + name_helpers::managed_event_args_name(evt) + ">";
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if (!as_generator(
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documentation(1)
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<< scope_tab << "event EventHandler" << wrapper_args_type << " " << evt_name << ";\n"
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).generate(sink, evt, context))
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return false;
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return true;
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}
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} const event_declaration {};
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struct event_registration_generator
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{
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attributes::klass_def const& klass;
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attributes::klass_def const& leaf_klass;
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bool is_inherited_event;
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template<typename OutputIterator, typename Context>
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bool generate(OutputIterator sink, attributes::event_def const& evt, Context const& context) const
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{
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std::string wrapper_event_name;
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if (is_inherited_event && !helpers::is_unique_event(evt, leaf_klass))
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wrapper_event_name = name_helpers::translate_inherited_event_name(evt, klass);
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else
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wrapper_event_name = name_helpers::managed_event_name(evt.name);
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return as_generator(scope_tab << scope_tab << "evt_" << wrapper_event_name << "_delegate = "
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<< "new Efl.EventCb(on_" << wrapper_event_name << "_NativeCallback);\n"
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).generate(sink, attributes::unused, context);
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}
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};
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struct event_registration_parameterized
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{
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event_registration_generator operator()(attributes::klass_def const& klass, attributes::klass_def const& leaf_klass) const
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{
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bool is_inherited_event = klass != leaf_klass;
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return {klass, leaf_klass, is_inherited_event};
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}
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} const event_registration;
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struct event_definition_generator
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{
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attributes::klass_def const& klass;
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attributes::klass_def const& leaf_klass;
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bool is_inherited_event;
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template<typename OutputIterator, typename Context>
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bool generate(OutputIterator sink, attributes::event_def const& evt, Context context) const
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{
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std::string managed_evt_name = name_helpers::managed_event_name(evt.name);
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bool is_unique = helpers::is_unique_event(evt, leaf_klass);
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bool use_explicit_impl = is_inherited_event && !is_unique;
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// The name of the public event that goes in the public API.
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std::string wrapper_evt_name;
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if (use_explicit_impl)
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wrapper_evt_name = name_helpers::translate_inherited_event_name(evt, klass);
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else
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wrapper_evt_name = managed_evt_name;
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std::string klass_name;
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if (is_inherited_event)
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klass_name = name_helpers::klass_full_interface_name(klass);
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else
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klass_name = name_helpers::klass_concrete_name(klass);
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std::string wrapper_args_type = "EventArgs";
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std::string wrapper_args_template = "";
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std::string event_args = "EventArgs args = EventArgs.Empty;\n";
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efl::eina::optional<grammar::attributes::type_def> etype = evt.type;
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if (etype.is_engaged())
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{
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wrapper_args_type = name_helpers::managed_event_args_name(evt);
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wrapper_args_template = "<" + wrapper_args_type + ">";
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std::string arg_initializer = wrapper_args_type + " args = new " + wrapper_args_type + "();\n";
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arg_initializer += " args.arg = ";
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auto arg_initializer_sink = std::back_inserter(arg_initializer);
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if (!(*etype).original_type.visit(unpack_event_args_visitor<decltype(arg_initializer_sink), Context>{arg_initializer_sink, &context, *etype}))
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return false;
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arg_initializer += ";\n";
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event_args = arg_initializer;
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}
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if(!as_generator("private static object " << wrapper_evt_name << "Key = new object();\n")
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.generate(sink, attributes::unused, context))
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return false;
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if(!as_generator(documentation(1)).generate(sink, evt, context))
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return false;
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// Visible event declaration. Either a regular class member or an explicit interface implementation.
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if (klass.type == attributes::class_type::interface_ || klass.type == attributes::class_type::mixin)
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{
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// Public event implementation.
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if (!as_generator(
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scope_tab << (!use_explicit_impl ? "public " : " ") << "event EventHandler" << wrapper_args_template << " " << (use_explicit_impl ? (klass_name + ".") : "") << managed_evt_name << "\n"
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).generate(sink, attributes::unused, context))
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return false;
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}
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else // For inheritable classes event handling.
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{
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// We may have inherited an event with the same name as this concrete event, thus
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// the concrete event would "hide" the interface one, requiring the new keyword.
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std::string visibility = "public ";
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if (!is_unique)
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visibility += "new ";
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if (!as_generator(
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scope_tab << visibility << "event EventHandler" << wrapper_args_template << " " << wrapper_evt_name << "\n"
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).generate(sink, attributes::unused, context))
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return false;
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}
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if (!generate_event_add_remove(sink, evt, wrapper_evt_name, context))
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return false;
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if (!generate_event_trigger(sink, wrapper_evt_name, wrapper_args_type, wrapper_args_template, context))
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return false;
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// Store the delegate for this event in this instance. This is initialized in register_event_proxies()
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// We can't initialize them directly here as they depend on the member methods being valid (i.e.
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// the constructor being called).
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if (!as_generator(scope_tab << "Efl.EventCb evt_" << wrapper_evt_name << "_delegate;\n").generate(sink, attributes::unused, context))
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return false;
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// Callback to be given to C's callback_priority_add
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if (!as_generator(
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scope_tab << "private void on_" << wrapper_evt_name << "_NativeCallback(System.IntPtr data, ref Efl.Event_StructInternal evt)\n"
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<< scope_tab << "{\n"
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<< scope_tab << scope_tab << event_args
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<< scope_tab << scope_tab << "try {\n"
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<< scope_tab << scope_tab << scope_tab << "On_" << wrapper_evt_name << "(args);\n"
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<< scope_tab << scope_tab << "} catch (Exception e) {\n"
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<< scope_tab << scope_tab << scope_tab << "Eina.Log.Error(e.ToString());\n"
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<< scope_tab << scope_tab << scope_tab << "Eina.Error.Set(Eina.Error.EFL_ERROR);\n"
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<< scope_tab << scope_tab << "}\n"
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<< scope_tab << "}\n\n"
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).generate(sink, attributes::unused, context))
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return false;
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return true;
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}
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template<typename OutputIterator, typename Context>
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bool generate_event_trigger(OutputIterator sink
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, std::string const& event_name
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, std::string const& event_args_type
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, std::string const& event_template_args
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, Context context) const
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{
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auto delegate_type = "EventHandler" + event_template_args;
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if (!as_generator(
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scope_tab << "///<summary>Method to raise event "<< event_name << ".</summary>\n"
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<< scope_tab << "public void On_" << event_name << "(" << event_args_type << " e)\n"
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<< scope_tab << "{\n"
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<< scope_tab << scope_tab << delegate_type << " evt;\n"
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<< scope_tab << scope_tab << "lock (eventLock) {\n"
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<< scope_tab << scope_tab << "evt = (" << delegate_type << ")eventHandlers[" << event_name << "Key];\n"
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<< scope_tab << scope_tab << "}\n"
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<< scope_tab << scope_tab << "evt?.Invoke(this, e);\n"
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<< scope_tab << "}\n"
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).generate(sink, nullptr, context))
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return false;
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return true;
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}
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template<typename OutputIterator, typename Context>
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bool generate_event_add_remove(OutputIterator sink, attributes::event_def const &evt, const std::string& event_name, Context context) const
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{
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std::string upper_c_name = utils::to_uppercase(evt.c_name);
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return as_generator(
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scope_tab << "{\n"
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<< scope_tab << scope_tab << "add {\n"
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<< scope_tab << scope_tab << scope_tab << "lock (eventLock) {\n"
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<< scope_tab << scope_tab << scope_tab << scope_tab << "string key = \"_" << upper_c_name << "\";\n"
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<< scope_tab << scope_tab << scope_tab << scope_tab << "if (add_cpp_event_handler(key, this.evt_" << event_name << "_delegate)) {\n"
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<< scope_tab << scope_tab << scope_tab << scope_tab << scope_tab << "eventHandlers.AddHandler(" << event_name << "Key , value);\n"
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<< scope_tab << scope_tab << scope_tab << scope_tab << "} else\n"
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<< scope_tab << scope_tab << scope_tab << scope_tab << scope_tab << "Eina.Log.Error($\"Error adding proxy for event {key}\");\n"
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<< scope_tab << scope_tab << scope_tab << "}\n" // End of lock block
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<< scope_tab << scope_tab << "}\n"
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<< scope_tab << scope_tab << "remove {\n"
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<< scope_tab << scope_tab << scope_tab << "lock (eventLock) {\n"
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<< scope_tab << scope_tab << scope_tab << scope_tab << "string key = \"_" << upper_c_name << "\";\n"
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<< scope_tab << scope_tab << scope_tab << scope_tab << "if (remove_cpp_event_handler(key, this.evt_" << event_name << "_delegate)) { \n"
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<< scope_tab << scope_tab << scope_tab << scope_tab << scope_tab << "eventHandlers.RemoveHandler(" << event_name << "Key , value);\n"
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<< scope_tab << scope_tab << scope_tab << scope_tab << "} else\n"
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<< scope_tab << scope_tab << scope_tab << scope_tab << scope_tab << "Eina.Log.Error($\"Error removing proxy for event {key}\");\n"
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<< scope_tab << scope_tab << scope_tab << "}\n" // End of lock block
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<< scope_tab << scope_tab << "}\n"
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<< scope_tab << "}\n"
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).generate(sink, attributes::unused, context);
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}
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};
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struct event_definition_parameterized
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{
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event_definition_generator operator()(attributes::klass_def const& klass, attributes::klass_def const& leaf_klass) const
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{
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bool is_inherited_event = klass != leaf_klass;
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return {klass, leaf_klass, is_inherited_event};
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}
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} const event_definition;
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}
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namespace efl { namespace eolian { namespace grammar {
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template <>
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struct is_eager_generator<struct ::eolian_mono::event_argument_wrapper_generator> : std::true_type {};
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template <>
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struct is_generator<struct ::eolian_mono::event_argument_wrapper_generator> : std::true_type {};
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template <>
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struct is_eager_generator<struct ::eolian_mono::event_declaration_generator> : std::true_type {};
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template <>
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struct is_generator<struct ::eolian_mono::event_declaration_generator> : std::true_type {};
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template <>
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struct is_eager_generator<struct ::eolian_mono::event_registration_generator> : std::true_type {};
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template <>
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struct is_generator<struct ::eolian_mono::event_registration_generator> : std::true_type {};
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template <>
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struct is_generator<struct ::eolian_mono::event_registration_parameterized> : std::true_type {};
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template <>
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struct is_eager_generator<struct ::eolian_mono::event_definition_generator> : std::true_type {};
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template <>
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struct is_generator<struct ::eolian_mono::event_definition_generator> : std::true_type {};
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template <>
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struct is_generator<struct ::eolian_mono::event_definition_parameterized> : std::true_type {};
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namespace type_traits {
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template <>
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struct attributes_needed<struct ::eolian_mono::event_argument_wrapper_generator> : std::integral_constant<int, 1> {};
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template <>
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struct attributes_needed<struct ::eolian_mono::event_declaration_generator> : std::integral_constant<int, 1> {};
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template <>
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struct attributes_needed<struct ::eolian_mono::event_registration_generator> : std::integral_constant<int, 1> {};
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template <>
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struct attributes_needed<struct ::eolian_mono::event_registration_parameterized> : std::integral_constant<int, 1> {};
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template <>
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struct attributes_needed<struct ::eolian_mono::event_definition_generator> : std::integral_constant<int, 1> {};
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template <>
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struct attributes_needed<struct ::eolian_mono::event_definition_parameterized> : std::integral_constant<int, 1> {};
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}
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} } }
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#endif
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