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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* expand/macro_rules.cpp
* - Top-level handling of macro_rules! macros
* > macro_rules! dispatch handler
* > #[macro_use]
* > #[macro_export]
* > #[macro_reexport]
*/
#include <synext.hpp>
#include "../ast/expr.hpp"
#include "../ast/ast.hpp"
#include "../parse/common.hpp"
#include "../parse/ttstream.hpp"
#include <ast/crate.hpp>
#include <macro_rules/macro_rules.hpp>
#include <hir/hir.hpp> // for HIR::Crate
class CMacroRulesExpander:
public ExpandProcMacro
{
::std::unique_ptr<TokenStream> expand(const Span& sp, const ::AST::Crate& crate, const TokenTree& tt, AST::Module& mod) override
{
ERROR(sp, E0000, "macro_rules! requires an identifier" );
}
::std::unique_ptr<TokenStream> expand_ident(const Span& sp, const ::AST::Crate& crate, const RcString& ident, const TokenTree& tt, AST::Module& mod) override
{
DEBUG("Parsing macro_rules! " << ident);
TTStream lex(sp, tt);
auto mac = Parse_MacroRules(lex);
mod.add_macro( false, ident, mv$(mac) );
return ::std::unique_ptr<TokenStream>( new TTStreamO(sp, TokenTree()) );
}
};
class CMacroUseHandler:
public ExpandDecorator
{
AttrStage stage() const override { return AttrStage::Post; }
void handle(const Span& sp, const AST::Attribute& mi, ::AST::Crate& crate, const AST::Path& path, AST::Module& mod, AST::Item& i) const override
{
TRACE_FUNCTION_F("path=" << path);
TU_IFLET( ::AST::Item, i, None, e,
// Just ignore
)
else TU_IFLET( ::AST::Item, i, Crate, ec_name,
const auto& ec = crate.m_extern_crates.at(ec_name.name.c_str());
if( mi.has_sub_items() )
{
TODO(sp, "Named import from extern crate");
}
else
{
ec.with_all_macros([&](const auto& name, const auto& mac) {
DEBUG("Imported " << name << "!");
mod.add_macro_import( name, mac );
});
for(const auto& p : ec.m_hir->m_proc_macros)
{
mod.m_macro_imports.push_back(AST::Module::MacroImport{ false, p.path.m_components.back(), p.path.m_components, nullptr });
mod.m_macro_imports.back().path.insert( mod.m_macro_imports.back().path.begin(), p.path.m_crate_name );
}
for(const auto& p : ec.m_hir->m_proc_macro_reexports)
{
mod.m_macro_imports.push_back(AST::Module::MacroImport{ /*is_pub=*/ false, p.first, p.second.path.m_components, nullptr });
mod.m_macro_imports.back().path.insert( mod.m_macro_imports.back().path.begin(), p.second.path.m_crate_name );
}
}
)
else TU_IFLET( ::AST::Item, i, Module, submod,
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(sp, 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 );
}
}
)
else {
ERROR(sp, E0000, "Use of #[macro_use] on non-module/crate - " << i.tag_str());
}
}
};
class CMacroExportHandler:
public ExpandDecorator
{
AttrStage stage() const override { return AttrStage::Post; }
void handle(const Span& sp, const AST::Attribute& mi, ::AST::Crate& crate, const AST::Path& path, AST::Module& mod, AST::Item& i) const override
{
if( i.is_None() ) {
}
else if( i.is_MacroInv() ) {
const auto& mac = i.as_MacroInv();
if( mac.name() != "macro_rules" ) {
ERROR(sp, E0000, "#[macro_export] is only valid on macro_rules!");
}
const auto& name = mac.input_ident();
// Tag the macro in the module for crate export
auto it = ::std::find_if( mod.macros().begin(), mod.macros().end(), [&](const auto& x){ return x.name == name; } );
ASSERT_BUG(sp, it != mod.macros().end(), "Macro '" << name << "' not defined in this module");
it->data->m_exported = true;
DEBUG("- Export macro " << name << "!");
}
else {
ERROR(sp, E0000, "Use of #[macro_export] on non-macro - " << i.tag_str());
}
}
};
class CMacroReexportHandler:
public ExpandDecorator
{
AttrStage stage() const override { return AttrStage::Post; }
void handle(const Span& sp, const AST::Attribute& mi, ::AST::Crate& crate, const AST::Path& path, AST::Module& mod, AST::Item& i) const override
{
if( !i.is_Crate() ) {
ERROR(sp, E0000, "Use of #[macro_reexport] on non-crate - " << i.tag_str());
}
const auto& crate_name = i.as_Crate().name;
auto& ext_crate = *crate.m_extern_crates.at(crate_name.c_str()).m_hir;
if( mi.has_sub_items() )
{
for( const auto& si : mi.items() )
{
const auto& name = si.name();
auto it = ext_crate.m_exported_macros.find(name);
if( it == ext_crate.m_exported_macros.end() )
ERROR(sp, E0000, "Could not find macro " << name << "! in crate " << crate_name);
it->second->m_exported = true;
}
}
else
{
ERROR(sp, E0000, "#[macro_reexport] requires a list of macros");
}
}
};
STATIC_MACRO("macro_rules", CMacroRulesExpander);
STATIC_DECORATOR("macro_use", CMacroUseHandler);
STATIC_DECORATOR("macro_export", CMacroExportHandler);
STATIC_DECORATOR("macro_reexport", CMacroReexportHandler);
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