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/*
*/
#include "../common.hpp"
#include "../ast/ast.hpp"
#include "../parse/parseerror.hpp"
class CPathResolver
{
const AST::Crate& m_crate;
const AST::Module& m_module;
::std::vector< ::std::string > m_locals;
// TODO: Maintain a stack of variable scopes
public:
CPathResolver(const AST::Crate& crate, const AST::Module& mod);
void resolve_path(AST::Path& path, bool allow_variables) const;
void resolve_type(TypeRef& type) const;
void handle_function(AST::Function& fcn);
void handle_pattern(AST::Pattern& pat);
void push_scope() {
m_locals.push_back( ::std::string() );
}
void pop_scope() {
for( auto it = m_locals.end(); --it != m_locals.begin(); ) {
if( *it == "" ) {
m_locals.erase(it, m_locals.end());
return ;
}
}
m_locals.clear();
}
};
// Path resolution checking
void ResolvePaths(AST::Crate& crate);
class CResolvePaths_NodeVisitor:
public AST::NodeVisitor
{
CPathResolver& m_res;
public:
CResolvePaths_NodeVisitor(CPathResolver& res):
m_res(res)
{
}
void visit(AST::ExprNode_NamedValue& node) {
m_res.resolve_path(node.m_path, true);
}
void visit(AST::ExprNode_Match& node) {
AST::NodeVisitor::visit(node.m_val);
for( auto& arm : node.m_arms )
{
m_res.push_scope();
m_res.handle_pattern(arm.first);
AST::NodeVisitor::visit(arm.second);
m_res.pop_scope();
}
}
};
CPathResolver::CPathResolver(const AST::Crate& crate, const AST::Module& mod):
m_crate(crate),
m_module(mod)
{
}
void CPathResolver::resolve_path(AST::Path& path, bool allow_variables) const
{
// Handle generic components of the path
for( auto& ent : path.nodes() )
{
for( auto& arg : ent.args() )
{
resolve_type(arg);
}
}
// Convert to absolute
if( !path.is_relative() )
{
// Already absolute, our job is done
}
else
{
if( allow_variables && path.size() == 1 && path[0].args().size() == 0 )
{
// One non-generic component, look in the current function for a variable
const ::std::string& var = path[0].name();
DEBUG("varname = " << var);
auto varslot = m_locals.end();
for(auto slot = m_locals.begin(); slot != m_locals.end(); ++slot)
{
if( *slot == var ) {
varslot = slot;
}
}
if( varslot != m_locals.end() )
{
DEBUG("Located slot");
path = AST::Path(AST::Path::TagLocal(), var);
return ;
}
}
// Search relative to current module
throw ParseError::Todo("CPathResolver::resolve_path()");
}
}
void CPathResolver::resolve_type(TypeRef& type) const
{
// TODO: Convert type into absolute
throw ParseError::Todo("CPathResolver::resolve_type()");
}
void CPathResolver::handle_pattern(AST::Pattern& pat)
{
DEBUG("pat = " << pat);
throw ParseError::Todo("CPathResolver::handle_pattern()");
}
void CPathResolver::handle_function(AST::Function& fcn)
{
CResolvePaths_NodeVisitor node_visitor(*this);
for( auto& arg : fcn.args() )
m_locals.push_back(arg.first);
fcn.code().visit_nodes( node_visitor );
resolve_type(fcn.rettype());
for( auto& arg : fcn.args() )
resolve_type(arg.second);
pop_scope();
if( m_locals.size() != 0 )
throw ParseError::BugCheck("m_locals.size() != 0");
}
void ResolvePaths_HandleFunction(const AST::Crate& crate, const AST::Module& mod, AST::Function& fcn)
{
CPathResolver pr(crate, mod);
pr.handle_function(fcn);
}
void ResolvePaths(AST::Crate& crate)
{
crate.iterate_functions(ResolvePaths_HandleFunction);
}
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