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#include <synext.hpp>
#include "../common.hpp"
#include "../ast/ast.hpp"
#include "../ast/expr.hpp"
template<typename T>
static inline ::std::vector<T> vec$(T v1) {
::std::vector<T> tmp;
tmp.push_back( mv$(v1) );
return mv$(tmp);
}
template<typename T>
static inline ::std::vector<T> vec$(T v1, T v2) {
::std::vector<T> tmp;
tmp.push_back( mv$(v1) );
tmp.push_back( mv$(v2) );
return mv$(tmp);
}
static inline AST::ExprNodeP mk_exprnodep(AST::ExprNode* en){ return AST::ExprNodeP(en); }
#define NEWNODE(type, ...) mk_exprnodep(new type(__VA_ARGS__))
/// Interface for derive handlers
struct Deriver
{
virtual AST::Impl handle_item(Span sp, const AST::GenericParams& params, const TypeRef& type, const AST::Struct& str) const = 0;
};
/// 'Debug' derive handler
class Deriver_Debug:
public Deriver
{
//static AST::ExprNodeP _print_l(::std::string val)
//{
// return NEWNODE(AST::ExprNode_CallMethod,
// NEWNODE(AST::ExprNode_NamedValue, AST::Path("f")),
// AST::PathNode("write_str",{}),
// { NEWNODE(AST::ExprNode_String, mv$(val)) }
// );
//}
//static AST::ExprNodeP _try(AST::ExprNodeP expr)
//{
// throw CompileError::Todo("derive(Debug) - _try");
//}
public:
AST::Impl handle_item(Span sp, const AST::GenericParams& p, const TypeRef& type, const AST::Struct& str) const override
{
// TODO: be correct herhe and use "core" as the crate name
// - Requires handling the crate_name crate attribute correctly
const AST::Path debug_trait("", { AST::PathNode("fmt", {}), AST::PathNode("Debug", {}) });
const TypeRef ret_type(sp, AST::Path("", {AST::PathNode("fmt",{}), AST::PathNode("Result",{})}) );
const TypeRef f_type(TypeRef::TagReference(), sp, true,
TypeRef(sp, AST::Path("", {AST::PathNode("fmt",{}), AST::PathNode("Formatter", {})}))
);
const ::std::string& name = type.path().nodes().back().name();
// Generate code for Debug
AST::ExprNodeP node;
TU_MATCH(AST::StructData, (str.m_data), (e),
(Struct,
node = NEWNODE(AST::ExprNode_NamedValue, AST::Path("f"));
node = NEWNODE(AST::ExprNode_CallMethod,
mv$(node), AST::PathNode("debug_struct",{}),
vec$( NEWNODE(AST::ExprNode_String, name) )
);
for( const auto& fld : e.ents )
{
node = NEWNODE(AST::ExprNode_CallMethod,
mv$(node), AST::PathNode("field",{}),
vec$(
NEWNODE(AST::ExprNode_String, fld.m_name),
NEWNODE(AST::ExprNode_UniOp, AST::ExprNode_UniOp::REF,
NEWNODE(AST::ExprNode_Field,
NEWNODE(AST::ExprNode_NamedValue, AST::Path("self")),
fld.m_name
)
)
)
);
}
node = NEWNODE(AST::ExprNode_CallMethod, mv$(node), AST::PathNode("finish",{}), {});
),
(Tuple,
node = NEWNODE(AST::ExprNode_NamedValue, AST::Path("f"));
node = NEWNODE(AST::ExprNode_CallMethod,
mv$(node), AST::PathNode("debug_tuple",{}),
vec$( NEWNODE(AST::ExprNode_String, name) )
);
for( unsigned int idx = 0; idx < e.ents.size(); idx ++ )
{
node = NEWNODE(AST::ExprNode_CallMethod,
mv$(node), AST::PathNode("field",{}),
vec$(
NEWNODE(AST::ExprNode_UniOp, AST::ExprNode_UniOp::REF,
NEWNODE(AST::ExprNode_Field,
NEWNODE(AST::ExprNode_NamedValue, AST::Path("self")),
FMT(idx)
)
)
)
);
}
node = NEWNODE(AST::ExprNode_CallMethod, mv$(node), AST::PathNode("finish",{}), {});
)
)
DEBUG("node = " << *node);
AST::Function fcn(
AST::GenericParams(),
ret_type,
vec$(
::std::make_pair( AST::Pattern(AST::Pattern::TagBind(), "self"), TypeRef(TypeRef::TagReference(), sp, false, TypeRef("Self")) ),
::std::make_pair( AST::Pattern(AST::Pattern::TagBind(), "f"), f_type )
)
);
fcn.set_code( NEWNODE(AST::ExprNode_Block, vec$(mv$(node)), ::std::unique_ptr<AST::Module>()) );
AST::Impl rv( AST::ImplDef( sp, AST::MetaItems(), p, make_spanned(sp, debug_trait), type ) );
rv.add_function(false, "fmt", mv$(fcn));
return mv$(rv);
}
} g_derive_debug;
// --------------------------------------------------------------------
// Select and dispatch the correct derive() handler
// --------------------------------------------------------------------
static const Deriver* find_impl(const ::std::string& trait_name)
{
if( trait_name == "Debug" )
return &g_derive_debug;
else
return nullptr;
}
template<typename T>
static void derive_item(const Span& sp, AST::Module& mod, const AST::MetaItem& attr, const AST::Path& path, const T& item)
{
if( !attr.has_sub_items() ) {
//throw CompileError::Generic("#[derive()] requires a list of known traits to derive");
return ;
}
DEBUG("path = " << path);
bool fail = false;
const auto& params = item.params();
TypeRef type(sp, path);
auto& types_args = type.path().nodes().back().args();
for( const auto& param : params.ty_params() ) {
types_args.m_types.push_back( TypeRef(TypeRef::TagArg(), param.name()) );
}
for( const auto& trait : attr.items() )
{
DEBUG("- " << trait.name());
auto dp = find_impl(trait.name());
if( !dp ) {
DEBUG("> No handler for " << trait.name());
fail = true;
continue ;
}
mod.add_impl( dp->handle_item(sp, params, type, item) );
}
if( fail ) {
//throw CompileError::Generic("Failed to #[dervie]");
}
}
class Decorator_Derive:
public ExpandDecorator
{
public:
AttrStage stage() const override { return AttrStage::LatePost; }
void handle(const Span& sp, const AST::MetaItem& attr, ::AST::Crate& crate, const AST::Path& path, AST::Module& mod, AST::Item& i) const override
{
TU_MATCH_DEF(::AST::Item, (i), (e),
(
),
(Struct,
derive_item(sp, mod, attr, path, e);
)
)
}
};
STATIC_DECORATOR("derive", Decorator_Derive)
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