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use super::util::Scope;
use std::{cell::RefCell, rc::Rc};
use swc_atoms::js_word;
use swc_common::DUMMY_SP;
use swc_ecma_ast::*;
use swc_ecma_transforms_base::enable_helper;
use swc_ecma_visit::{
as_folder, noop_visit_mut_type, noop_visit_type, Fold, Node, Visit, VisitMut, VisitWith,
};
pub fn import_analyzer(scope: Rc<RefCell<Scope>>) -> impl Fold + VisitMut {
as_folder(ImportAnalyzer { scope })
}
pub struct ImportAnalyzer {
scope: Rc<RefCell<Scope>>,
}
impl VisitMut for ImportAnalyzer {
noop_visit_mut_type!();
fn visit_mut_module(&mut self, module: &mut Module) {
self.visit_module(&*module, &Invalid { span: DUMMY_SP } as _);
for (_, ty) in self.scope.borrow().import_types.iter() {
if *ty {
enable_helper!(interop_require_wildcard);
} else {
enable_helper!(interop_require_default);
}
}
let (need_wildcard, need_default) = self.scope.borrow().unknown_imports;
if need_wildcard {
enable_helper!(interop_require_wildcard);
}
if need_default {
enable_helper!(interop_require_default);
}
}
}
impl Visit for ImportAnalyzer {
noop_visit_type!();
fn visit_call_expr(&mut self, n: &CallExpr, _parent: &dyn Node) {
n.visit_children_with(self);
let mut scope = self.scope.borrow_mut();
match &n.callee {
ExprOrSuper::Expr(callee) => match &**callee {
Expr::Ident(callee) => {
if callee.sym == js_word!("import") {
if let Some(ExprOrSpread { spread: None, expr }) = n.args.first() {
match &**expr {
Expr::Lit(Lit::Str(src)) => {
*scope.import_types.entry(src.value.clone()).or_default() =
true;
}
_ => {
scope.unknown_imports.0 = true;
}
}
}
}
}
_ => {}
},
_ => {}
}
}
fn visit_export_all(&mut self, export: &ExportAll, _parent: &dyn Node) {
*self
.scope
.borrow_mut()
.import_types
.entry(export.src.value.clone())
.or_default() = true
}
fn visit_import_decl(&mut self, import: &ImportDecl, _parent: &dyn Node) {
let mut scope = self.scope.borrow_mut();
if import.specifiers.is_empty() {
} else if import.specifiers.len() == 1
&& match import.specifiers[0] {
ImportSpecifier::Namespace(..) => true,
_ => false,
}
{
if &*import.src.value != "@swc/helpers" {
scope.import_types.insert(import.src.value.clone(), true);
}
} else {
let mut has_non_default = false;
for s in &import.specifiers {
match *s {
ImportSpecifier::Namespace(ref _ns) => {
if &*import.src.value != "@swc/helpers" {
scope.import_types.insert(import.src.value.clone(), true);
}
}
ImportSpecifier::Default(_) => {
scope
.import_types
.entry(import.src.value.clone())
.or_insert(false);
}
ImportSpecifier::Named(ref i) => {
let ImportNamedSpecifier {
ref local,
ref imported,
..
} = *i;
let name = imported
.as_ref()
.map(|i| i.sym.clone())
.unwrap_or_else(|| local.sym.clone());
let is_default = name == js_word!("default");
if is_default {
scope
.import_types
.entry(import.src.value.clone())
.or_insert(has_non_default);
} else {
has_non_default = true;
scope
.import_types
.entry(import.src.value.clone())
.and_modify(|v| *v = true);
}
}
}
}
}
}
fn visit_named_export(&mut self, export: &NamedExport, _parent: &dyn Node) {
if export.specifiers.iter().any(|v| match v {
ExportSpecifier::Namespace(..) => true,
_ => false,
}) {
let mut scope = self.scope.borrow_mut();
if let Some(ref src) = export.src {
*scope.import_types.entry(src.value.clone()).or_default() = true;
}
return;
}
let mut scope = self.scope.borrow_mut();
for &ExportNamedSpecifier { ref orig, .. } in
export.specifiers.iter().filter_map(|e| match *e {
ExportSpecifier::Named(ref e) => Some(e),
_ => None,
})
{
let is_import_default = orig.sym == js_word!("default");
if let Some(ref src) = export.src {
if is_import_default {
scope.import_types.entry(src.value.clone()).or_insert(false);
} else {
scope
.import_types
.entry(src.value.clone())
.and_modify(|v| *v = true);
}
}
}
}
}