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/*
* Absolutise and check all 'use' statements
*/
#include <main_bindings.hpp>
#include <ast/crate.hpp>
#include <ast/ast.hpp>
void Resolve_Use_Mod(const ::AST::Crate& crate, ::AST::Module& mod, ::AST::Path path);
::AST::Path Resolve_Use_AbsolutisePath(const ::AST::Path& base_path, ::AST::Path path);
::AST::PathBinding Resolve_Use_GetBinding(const Span& span, const ::AST::Crate& crate, const ::AST::Path& path);
void Resolve_Use(::AST::Crate& crate)
{
Resolve_Use_Mod(crate, crate.m_root_module, ::AST::Path("", {}));
}
::AST::Path Resolve_Use_AbsolutisePath(const Span& span, const ::AST::Path& base_path, ::AST::Path path)
{
TU_MATCH(::AST::Path::Class, (path.m_class), (e),
(Invalid,
// Should never happen
BUG(span, "Invalid path class encountered");
),
(Local,
// Wait, how is this already known?
BUG(span, "Local path class in use statement");
),
(UFCS,
// Wait, how is this already known?
BUG(span, "UFCS path class in use statement");
),
(Relative,
return base_path + path;
),
(Self,
return base_path + path;
),
(Super,
assert(e.count >= 1);
AST::Path np(base_path.crate(), {});
if( e.count > base_path.nodes().size() ) {
ERROR(span, E0000, "Too many `super` components");
}
for( unsigned int i = 0; i < base_path.nodes().size() - e.count; i ++ )
np.nodes().push_back( base_path.nodes()[i] );
np += path;
return np;
),
(Absolute,
// Leave as is
return path;
)
)
throw "BUG: Reached end of Resolve_Use_AbsolutisePath";
}
void Resolve_Use_Mod(const ::AST::Crate& crate, ::AST::Module& mod, ::AST::Path path)
{
TRACE_FUNCTION_F("path = " << path << ", mod.path() = " << mod.path());
for(auto& use_stmt : mod.imports())
{
const Span span;
use_stmt.data = Resolve_Use_AbsolutisePath(span, path, mv$(use_stmt.data));
if( !use_stmt.data.m_class.is_Absolute() )
BUG(span, "Use path is not absolute after absolutisation");
// TODO: Is this a valid assertion?
if( use_stmt.data.crate() != "" )
BUG(span, "Use path crate was set before resolve");
use_stmt.data.bind( Resolve_Use_GetBinding(span, crate, use_stmt.data) );
// - If doing a glob, ensure the item type is valid
if( use_stmt.name == "" )
{
TU_MATCH_DEF(::AST::PathBinding, (use_stmt.data.binding()), (e),
(
ERROR(span, E0000, "Wildcard import of invalid item type");
),
(Enum,
),
(Module,
)
)
}
}
for(auto& i : mod.items())
{
if( i.data.is_Module() )
{
Resolve_Use_Mod(crate, i.data.as_Module(), path + i.name);
}
}
}
::AST::PathBinding Resolve_Use_GetBinding_Mod(const Span& span, const ::AST::Crate& crate, const ::AST::Module& mod, const ::std::string& des_item_name)
{
for( const auto& item : mod.items() )
{
if( item.data.is_None() )
continue ;
if( item.name == des_item_name ) {
TU_MATCH(::AST::Item, (item.data), (e),
(None,
// IMPOSSIBLe - Handled above
),
(Crate,
//return ::AST::PathBinding::make_Crate({&e});
TODO(span, "Handle importing from a crate");
),
(Type,
return ::AST::PathBinding::make_TypeAlias({&e});
),
(Trait,
return ::AST::PathBinding::make_Trait({&e});
),
(Function,
return ::AST::PathBinding::make_Function({&e});
),
(Static,
return ::AST::PathBinding::make_Static({&e});
),
(Struct,
return ::AST::PathBinding::make_Struct({&e});
),
(Enum,
return ::AST::PathBinding::make_Enum({&e});
),
(Module,
return ::AST::PathBinding::make_Module({&e});
)
)
break ;
}
}
// Imports
for( const auto& imp : mod.imports() )
{
if( imp.name == des_item_name ) {
DEBUG("- Named import " << imp.name << " = " << imp.data);
if( imp.data.binding().is_Unbound() ) {
DEBUG(" > Needs resolve");
const Span sp2;
return Resolve_Use_GetBinding(sp2, crate, Resolve_Use_AbsolutisePath(sp2, mod.path(), imp.data));
}
else {
return imp.data.binding().clone();
}
}
if( imp.is_pub && imp.name == "" ) {
const Span sp2;
// INEFFICIENT! Resolves and throws away the result (because we can't/shouldn't mutate here)
::AST::PathBinding binding_;
const auto* binding = &imp.data.binding();
if( binding->is_Unbound() ) {
DEBUG("Temp resolving wildcard " << imp.data);
binding_ = Resolve_Use_GetBinding(sp2, crate, Resolve_Use_AbsolutisePath(sp2, mod.path(), imp.data));
binding = &binding_;
}
TU_MATCH_DEF(::AST::PathBinding, ((*binding)), (e),
(
BUG(sp2, "Wildcard import expanded to an invalid item class");
),
(Module,
TODO(span, "Look up wildcard in module");
),
(Enum,
TODO(span, "Look up wildcard in enum");
)
)
}
}
ERROR(span, E0000, "Could not find node '" << des_item_name << "' in module " << mod.path());
}
::AST::PathBinding Resolve_Use_GetBinding(const Span& span, const ::AST::Crate& crate, const ::AST::Path& path)
{
const AST::Module* mod = &crate.m_root_module;
const auto& nodes = path.nodes();
for( unsigned int i = 0; i < nodes.size()-1; i ++ )
{
auto b = Resolve_Use_GetBinding_Mod(span, crate, *mod, nodes[i].name());
TU_MATCH_DEF(::AST::PathBinding, (b), (e),
(
ERROR(span, E0000, "Unexpected item type in import");
),
(Enum,
const auto& enum_ = *e.enum_;
i += 1;
if( i != nodes.size() - 1 ) {
ERROR(span, E0000, "Encountered enum at unexpected location in import");
}
const auto& node2 = nodes[i];
int variant_index = -1;
for( unsigned int j = 0; j < enum_.variants().size(); j ++ )
{
if( enum_.variants()[j].m_name == node2.name() ) {
variant_index = j;
break ;
}
}
if( variant_index < 0 ) {
ERROR(span, E0000, "Unknown enum variant '" << node2.name() << "'");
}
return ::AST::PathBinding::make_EnumVar({&enum_, static_cast<unsigned int>(variant_index)});
),
(Module,
mod = e.module_;
)
)
}
return Resolve_Use_GetBinding_Mod(span, crate, *mod, nodes.back().name());
}
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