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#include <synext.hpp>
#include "../ast/expr.hpp"
#include "../ast/ast.hpp"
#include "../parse/common.hpp"
#include "macro_rules.hpp"
#include <macro_rules/macro_rules.hpp>
class CMacroRulesExpander:
public ExpandProcMacro
{
bool expand_early() const override { return true; }
::std::unique_ptr<TokenStream> expand(Span sp, const ::AST::Crate& crate, const ::std::string& ident, const TokenTree& tt, AST::Module& mod) override
{
if( ident == "" )
ERROR(sp, E0000, "macro_rules! requires an identifier" );
DEBUG("Parsing macro_rules! " << ident);
TTStream lex(tt);
auto mac = Parse_MacroRules(lex);
mod.add_macro( false, ident, mv$(mac) );
return ::std::unique_ptr<TokenStream>( new TTStreamO(TokenTree()) );
}
};
class CMacroUseHandler:
public ExpandDecorator
{
AttrStage stage() const override { return AttrStage::EarlyPost; }
void handle(const AST::MetaItem& mi, ::AST::Crate& crate, const AST::Path& path, AST::Module& mod, AST::Item& i) const override
{
TRACE_FUNCTION_F("path=" << path);
if( !i.is_Module() )
throw ::std::runtime_error("ERROR: Use of #[macro_use] on non-module");
const auto& submod = i.as_Module();
if( mi.has_sub_items() )
{
for( const auto& si : mi.items() )
{
const auto& name = si.name();
for( const auto& mr : submod.macros() )
{
if( mr.name == name ) {
DEBUG("Imported " << mr.name);
mod.add_macro_import( mr.name, *mr.data );
goto _good;
}
}
for( const auto& mri : submod.macro_imports_res() )
{
if( mri.name == name ) {
DEBUG("Imported " << mri.name << " (propagate)");
mod.add_macro_import( mri.name, *mri.data );
goto _good;
}
}
ERROR(Span(), E0000, "Couldn't find macro " << name);
_good:
(void)0;
}
}
else
{
for( const auto& mr : submod.macros() )
{
DEBUG("Imported " << mr.name);
mod.add_macro_import( mr.name, *mr.data );
}
for( const auto& mri : submod.macro_imports_res() )
{
DEBUG("Imported " << mri.name << " (propagate)");
mod.add_macro_import( mri.name, *mri.data );
}
}
}
};
::std::unique_ptr<TokenStream> Macro_Invoke(const char* name, const MacroRules& rules, const TokenTree& tt, AST::Module& mod)
{
return Macro_InvokeRules(name, rules, tt);
}
STATIC_MACRO("macro_rules", CMacroRulesExpander);
STATIC_DECORATOR("macro_use", CMacroUseHandler);
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