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/*
* MRustC - Rust Compiler
* - By John Hodge (Mutabah/thePowersGang)
*
* expand/cfg.hpp
* - cfg! and #[cfg] handling
*/
#include <synext.hpp>
#include <parse/common.hpp>
#include <parse/tokentree.hpp>
#include <parse/ttstream.hpp>
#include "cfg.hpp"
#include <ast/expr.hpp> // Needed to clear a ExprNodeP
#include <ast/crate.hpp>
#include <map>
#include <set>
::std::multimap< ::std::string, ::std::string> g_cfg_values;
::std::map< ::std::string, ::std::function<bool(const ::std::string&)> > g_cfg_value_fcns;
::std::set< ::std::string > g_cfg_flags;
void Cfg_SetFlag(::std::string name) {
g_cfg_flags.insert( mv$(name) );
}
void Cfg_SetValue(::std::string name, ::std::string val) {
g_cfg_values.insert( ::std::make_pair(mv$(name), mv$(val)) );
}
void Cfg_SetValueCb(::std::string name, ::std::function<bool(const ::std::string&)> cb) {
g_cfg_value_fcns.insert( ::std::make_pair(mv$(name), mv$(cb)) );
}
bool check_cfg(const Span& sp, const ::AST::Attribute& mi) {
if( mi.has_sub_items() ) {
// Must be `any`/`not`/`all`
if( mi.name() == "any" || mi.name() == "cfg" ) {
for(const auto& si : mi.items()) {
if( check_cfg(sp, si) )
return true;
}
return false;
}
else if( mi.name() == "not" ) {
if( mi.items().size() != 1 )
ERROR(sp, E0000, "cfg(not()) with != 1 argument");
return !check_cfg(sp, mi.items()[0]);
}
else if( mi.name() == "all" ) {
for(const auto& si : mi.items()) {
if( ! check_cfg(sp, si) )
return false;
}
return true;
}
else {
// oops
ERROR(sp, E0000, "Unknown cfg() function - " << mi.name());
}
}
else if( mi.has_string() ) {
// Equaliy
auto its = g_cfg_values.equal_range(mi.name().c_str());
for(auto it = its.first; it != its.second; ++it)
{
DEBUG(""<<mi.name()<<": '"<<it->second<<"' == '"<<mi.string()<<"'");
if( it->second == mi.string() )
return true;
}
if( its.first != its.second )
return false;
auto it2 = g_cfg_value_fcns.find(mi.name().c_str());
if(it2 != g_cfg_value_fcns.end() )
{
DEBUG(""<<mi.name()<<": ('"<<mi.string()<<"')?");
return it2->second( mi.string() );
}
WARNING(sp, W0000, "Unknown cfg() param '" << mi.name() << "'");
return false;
}
else {
// Flag
auto it = g_cfg_flags.find(mi.name().c_str());
return (it != g_cfg_flags.end());
}
BUG(sp, "Fell off the end of check_cfg");
}
class CCfgExpander:
public ExpandProcMacro
{
::std::unique_ptr<TokenStream> expand(const Span& sp, const ::AST::Crate& crate, const TokenTree& tt, AST::Module& mod) override
{
auto lex = TTStream(sp, tt);
auto attrs = Parse_MetaItem(lex);
DEBUG("cfg!() - " << attrs);
if( check_cfg(sp, attrs) ) {
return box$( TTStreamO(sp, TokenTree({},TOK_RWORD_TRUE )) );
}
else {
return box$( TTStreamO(sp, TokenTree({},TOK_RWORD_FALSE)) );
}
}
};
class CCfgHandler:
public ExpandDecorator
{
AttrStage stage() const override { return AttrStage::Pre; }
void handle(const Span& sp, const AST::Attribute& mi, AST::Crate& crate) const override {
DEBUG("#[cfg] crate - " << mi);
// Ignore, as #[cfg] on a crate is handled in expand/mod.cpp
if( check_cfg(sp, mi) ) {
}
else {
crate.m_root_module.items().clear();
}
}
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_FR("#[cfg] item - " << mi, (i.is_None() ? "Deleted" : ""));
if( check_cfg(sp, mi) ) {
// Leave
}
else {
i = AST::Item::make_None({});
}
}
void handle(const Span& sp, const AST::Attribute& mi, ::AST::Crate& crate, ::std::unique_ptr<AST::ExprNode>& expr) const override {
DEBUG("#[cfg] expr - " << mi);
if( check_cfg(sp, mi) ) {
// Leave
}
else {
expr.reset();
}
}
void handle(const Span& sp, const AST::Attribute& mi, AST::Crate& crate, const AST::Module& mod, AST::ImplDef& impl) const override {
DEBUG("#[cfg] impl - " << mi);
if( check_cfg(sp, mi) ) {
// Leave
}
else {
impl.type() = ::TypeRef(sp);
}
}
void handle(const Span& sp, const AST::Attribute& mi, AST::Crate& crate, ::AST::StructItem& si) const override {
DEBUG("#[cfg] struct item - " << mi);
if( !check_cfg(sp, mi) ) {
si.m_name = "";
}
}
void handle(const Span& sp, const AST::Attribute& mi, AST::Crate& crate, ::AST::TupleItem& i) const override {
DEBUG("#[cfg] tuple item - " << mi);
if( !check_cfg(sp, mi) ) {
i.m_type = ::TypeRef(sp);
}
}
void handle(const Span& sp, const AST::Attribute& mi, AST::Crate& crate, ::AST::EnumVariant& i) const override {
DEBUG("#[cfg] enum variant - " << mi);
if( !check_cfg(sp, mi) ) {
i.m_name = "";
}
}
void handle(const Span& sp, const AST::Attribute& mi, AST::Crate& crate, ::AST::ExprNode_Match_Arm& i) const override {
DEBUG("#[cfg] match arm - " << mi);
if( !check_cfg(sp, mi) ) {
i.m_patterns.clear();
}
}
void handle(const Span& sp, const AST::Attribute& mi, AST::Crate& crate, ::AST::ExprNode_StructLiteral::Ent& i) const override {
DEBUG("#[cfg] struct lit - " << mi);
if( !check_cfg(sp, mi) ) {
i.value.reset();
}
}
};
STATIC_MACRO("cfg", CCfgExpander);
STATIC_DECORATOR("cfg", CCfgHandler);
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