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#include <synext.hpp>
#include "../ast/expr.hpp"
#include "../ast/ast.hpp"
#include "../parse/common.hpp"
#include "macro_rules.hpp"
class CMacroRulesExpander:
public ExpandProcMacro
{
bool expand_early() const override { return true; }
AST::Expr expand(const ::std::string& ident, const TokenTree& tt, AST::Module& mod, MacroPosition position)
{
if( ident == "" ) {
throw ::std::runtime_error( "ERROR: macro_rules! requires an identifier" );
}
TTStream lex(tt);
auto mac = Parse_MacroRules(lex);
// TODO: Place into current module using `ident` as the name
mod.add_macro( false, ident, mac );
return AST::Expr();
}
};
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().e;
if( mi.has_sub_items() )
{
throw ::std::runtime_error("TODO: #[macro_use]");
}
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 );
}
}
}
};
AST::Expr Macro_Invoke(const char* name, const MacroRules& rules, const TokenTree& tt, AST::Module& mod, MacroPosition position)
{
auto out_tt = Macro_InvokeRules(name, rules, tt);
TokenStream& lex = *out_tt;
// TODO: Expand out_tt
switch(position)
{
case MacroPosition::Item: {
LList<AST::Module*> l(nullptr, &mod);
Parse_ModRoot_Items(lex, mod, l, false, "-");
return AST::Expr();
}
default:
throw ::std::runtime_error("TODO: Macro in non-item position");
//case MacroPosition::Stmt: {
// break; }
}
}
STATIC_MACRO("macro_rules", CMacroRulesExpander);
STATIC_DECORATOR("macro_use", CMacroUseHandler);
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