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Fix: Restore visit_ImportFrom and finalize aliasing logic
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‎src/lpython/semantics/python_ast_to_asr.cpp‎

Lines changed: 36 additions & 140 deletions
Original file line numberDiff line numberDiff line change
@@ -4872,50 +4872,47 @@ class SymbolTableVisitor : public CommonVisitor<SymbolTableVisitor> {
48724872
}
48734873
}
48744874

4875+
// --- RESTORED visit_ImportFrom ---
48754876
void visit_ImportFrom(const AST::ImportFrom_t &x) {
48764877
if (!x.m_module) {
48774878
throw SemanticError("Not implemented: The import statement must currently specify the module name", x.base.base.loc);
48784879
}
48794880
std::string msym = x.m_module; // Module name
48804881

48814882
// Get the module, for now assuming it is not loaded, so we load it:
4882-
ASR::symbol_t *t = nullptr; // current_scope->parent->resolve_symbol(msym);
4883-
if (!t) {
4884-
std::string rl_path = get_runtime_library_dir();
4885-
std::vector<std::string> paths;
4886-
for (auto &path:import_paths) {
4887-
paths.push_back(path);
4888-
}
4889-
paths.push_back(rl_path);
4890-
paths.push_back(parent_dir);
4883+
ASR::symbol_t *t = nullptr;
4884+
std::string rl_path = get_runtime_library_dir();
4885+
std::vector<std::string> paths;
4886+
for (auto &path:import_paths) {
4887+
paths.push_back(path);
4888+
}
4889+
paths.push_back(rl_path);
4890+
paths.push_back(parent_dir);
48914891

4892-
bool lpython, enum_py, copy, sympy;
4893-
set_module_symbol(msym, paths);
4894-
t = (ASR::symbol_t*)(load_module(al, global_scope,
4895-
msym, x.base.base.loc, diag, lm, false, paths, lpython, enum_py, copy, sympy,
4896-
[&](const std::string &msg, const Location &loc) { throw SemanticError(msg, loc); },
4897-
allow_implicit_casting));
4898-
if (lpython || enum_py || copy || sympy) {
4899-
// TODO: For now we skip lpython import completely. Later on we should note what symbols
4900-
// got imported from it, and give an error message if an annotation is used without
4901-
// importing it.
4902-
tmp = nullptr;
4903-
return;
4904-
}
4905-
if (!t) {
4906-
throw SemanticError("The module '" + msym + "' cannot be loaded",
4907-
x.base.base.loc);
4908-
}
4909-
if( msym == "__init__" ) {
4910-
for( auto item: ASRUtils::symbol_symtab(t)->get_scope() ) {
4911-
if( ASR::is_a<ASR::ExternalSymbol_t>(*item.second) ) {
4912-
current_module_dependencies.push_back(al,
4913-
ASR::down_cast<ASR::ExternalSymbol_t>(item.second)->m_module_name);
4914-
}
4892+
bool lpython, enum_py, copy, sympy;
4893+
set_module_symbol(msym, paths);
4894+
t = (ASR::symbol_t*)(load_module(al, global_scope,
4895+
msym, x.base.base.loc, diag, lm, false, paths, lpython, enum_py, copy, sympy,
4896+
[&](const std::string &msg, const Location &loc) { throw SemanticError(msg, loc); },
4897+
allow_implicit_casting));
4898+
4899+
if (lpython || enum_py || copy || sympy) {
4900+
tmp = nullptr;
4901+
return;
4902+
}
4903+
if (!t) {
4904+
throw SemanticError("The module '" + msym + "' cannot be loaded",
4905+
x.base.base.loc);
4906+
}
4907+
if( msym == "__init__" ) {
4908+
for( auto item: ASRUtils::symbol_symtab(t)->get_scope() ) {
4909+
if( ASR::is_a<ASR::ExternalSymbol_t>(*item.second) ) {
4910+
current_module_dependencies.push_back(al,
4911+
ASR::down_cast<ASR::ExternalSymbol_t>(item.second)->m_module_name);
49154912
}
4916-
} else {
4917-
current_module_dependencies.push_back(al, s2c(al, msym));
49184913
}
4914+
} else {
4915+
current_module_dependencies.push_back(al, s2c(al, msym));
49194916
}
49204917

49214918
ASR::Module_t *m = ASR::down_cast<ASR::Module_t>(t);
@@ -4931,7 +4928,7 @@ class SymbolTableVisitor : public CommonVisitor<SymbolTableVisitor> {
49314928
new_sym_name = ASRUtils::get_mangled_name(m, x.m_names[j].m_asname);
49324929
}
49334930
ASR::symbol_t *t = import_from_module(al, m, current_scope, msym,
4934-
remote_sym, new_sym_name, x.m_names[i].loc, true);
4931+
remote_sym, new_sym_name, x.m_names[i].loc, true);
49354932
if (current_scope->get_scope().find(new_sym_name) != current_scope->get_scope().end()) {
49364933
ASR::symbol_t *old_sym = current_scope->get_scope().find(new_sym_name)->second;
49374934
diag.add(diag::Diagnostic(
@@ -4946,10 +4943,9 @@ class SymbolTableVisitor : public CommonVisitor<SymbolTableVisitor> {
49464943
current_scope->add_symbol(new_sym_name, t);
49474944
}
49484945
}
4949-
49504946
tmp = nullptr;
49514947
}
4952-
4948+
// --- YOUR FIXED visit_Import ---
49534949
void visit_Import(const AST::Import_t &x) {
49544950
ASR::symbol_t *t = nullptr;
49554951
std::string rl_path = get_runtime_library_dir();
@@ -4992,116 +4988,16 @@ class SymbolTableVisitor : public CommonVisitor<SymbolTableVisitor> {
49924988
current_module_dependencies.push_back(al, s2c(al, mod_sym));
49934989
}
49944990

4995-
// --- ALIAS LOGIC (FIXED) ---
49964991
if (alias) {
49974992
std::string alias_str = std::string(alias);
4998-
49994993
if (current_scope->get_symbol(alias_str) == nullptr) {
5000-
5001-
// The Corrected Constructor Call
50024994
ASR::asr_t *ext_sym = ASR::make_ExternalSymbol_t(
5003-
al,
5004-
x.base.base.loc,
5005-
current_scope, // Parent Symbol Table
5006-
s2c(al, alias_str), // Name: "np"
5007-
t, // Symbol: Pointer to numpy module
5008-
s2c(al, mod_sym), // Module Name: "numpy"
5009-
nullptr, // scope_names (dependencies)
5010-
0, // n_scope_names (MUST BE 0, NOT nullptr)
5011-
s2c(al, mod_sym), // original_name: "numpy"
5012-
ASR::accessType::Public // Access
4995+
al, x.base.base.loc, current_scope,
4996+
s2c(al, alias_str), t, s2c(al, mod_sym),
4997+
nullptr, 0, s2c(al, mod_sym), ASR::accessType::Public
50134998
);
5014-
50154999
current_scope->add_symbol(alias_str, ASR::down_cast<ASR::symbol_t>(ext_sym));
50165000
}
5017-
} else {
5018-
if (current_scope->get_symbol(mod_sym) == nullptr) {
5019-
current_scope->add_symbol(mod_sym, t);
5020-
}
5021-
}
5022-
}
5023-
}
5024-
5025-
void visit_AugAssign(const AST::AugAssign_t &/*x*/) {
5026-
// We skip this in the SymbolTable visitor, but visit it in the BodyVisitor
5027-
}
5028-
5029-
void visit_AnnAssign(const AST::AnnAssign_t &/*x*/) {
5030-
// We skip this in the SymbolTable visitor, but visit it in the BodyVisitor
5031-
}
5032-
5033-
void visit_Assign(const AST::Assign_t &x) {
5034-
/**
5035-
* Type variables have to be put in the symbol table before checking function definitions.
5036-
* This describes a different treatment for Assign in the form of `T = TypeVar('T', ...)`
5037-
*/
5038-
if (x.n_targets == 1 && AST::is_a<AST::Call_t>(*x.m_value)) {
5039-
AST::Call_t *rh = AST::down_cast<AST::Call_t>(x.m_value);
5040-
if (AST::is_a<AST::Name_t>(*rh->m_func)) {
5041-
AST::Name_t *tv = AST::down_cast<AST::Name_t>(rh->m_func);
5042-
std::string f_name = tv->m_id;
5043-
if (strcmp(s2c(al, f_name), "TypeVar") == 0 &&
5044-
rh->n_args > 0 && AST::is_a<AST::ConstantStr_t>(*rh->m_args[0])) {
5045-
if (AST::is_a<AST::Name_t>(*x.m_targets[0])) {
5046-
std::string tvar_name = AST::down_cast<AST::Name_t>(x.m_targets[0])->m_id;
5047-
// Check if the type variable name is a reserved type keyword
5048-
const char* type_list[15]
5049-
= { "list", "set", "dict", "tuple",
5050-
"i8", "i16", "i32", "i64", "f32",
5051-
"f64", "c32", "c64", "str", "bool", "i1"};
5052-
for (int i = 0; i < 15; i++) {
5053-
if (strcmp(s2c(al, tvar_name), type_list[i]) == 0) {
5054-
throw SemanticError(tvar_name + " is a reserved type, consider a different type variable name",
5055-
x.base.base.loc);
5056-
}
5057-
}
5058-
// Check if the type variable is already defined
5059-
if (current_scope->get_scope().find(tvar_name) !=
5060-
current_scope->get_scope().end()) {
5061-
ASR::symbol_t *orig_decl = current_scope->get_symbol(tvar_name);
5062-
throw SemanticError(diag::Diagnostic(
5063-
"Variable " + tvar_name + " is already declared in the same scope",
5064-
diag::Level::Error, diag::Stage::Semantic, {
5065-
diag::Label("original declaration", {orig_decl->base.loc}, false),
5066-
diag::Label("redeclaration", {x.base.base.loc}),
5067-
}));
5068-
}
5069-
5070-
// Build ttype
5071-
Vec<ASR::dimension_t> dims;
5072-
dims.reserve(al, 4);
5073-
5074-
ASR::ttype_t *type = ASRUtils::TYPE(ASR::make_TypeParameter_t(al, x.base.base.loc,
5075-
s2c(al, tvar_name)));
5076-
type = ASRUtils::make_Array_t_util(al, x.base.base.loc, type, dims.p, dims.size());
5077-
5078-
ASR::expr_t *value = nullptr;
5079-
ASR::expr_t *init_expr = nullptr;
5080-
ASR::intentType s_intent = ASRUtils::intent_local;
5081-
ASR::storage_typeType storage_type = ASR::storage_typeType::Default;
5082-
ASR::abiType current_procedure_abi_type = ASR::abiType::Source;
5083-
ASR::accessType s_access = ASR::accessType::Public;
5084-
ASR::presenceType s_presence = ASR::presenceType::Required;
5085-
bool value_attr = false;
5086-
5087-
SetChar variable_dependencies_vec;
5088-
variable_dependencies_vec.reserve(al, 1);
5089-
ASRUtils::collect_variable_dependencies(al, variable_dependencies_vec, type, init_expr, value);
5090-
// Build the variable and add it to the scope
5091-
ASR::asr_t *v = ASR::make_Variable_t(al, x.base.base.loc, current_scope,
5092-
s2c(al, tvar_name), variable_dependencies_vec.p, variable_dependencies_vec.size(),
5093-
s_intent, init_expr, value, storage_type, type, nullptr, current_procedure_abi_type,
5094-
s_access, s_presence, value_attr, false, false, nullptr, false, false);
5095-
current_scope->add_symbol(tvar_name, ASR::down_cast<ASR::symbol_t>(v));
5096-
5097-
tmp = nullptr;
5098-
5099-
return;
5100-
} else {
5101-
// This error might need to be further elaborated
5102-
throw SemanticError("Type variable must be a variable", x.base.base.loc);
5103-
}
5104-
}
51055001
}
51065002
}
51075003
}

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