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use anyhow::Result;
use serde::{Deserialize, Serialize};
use swc_core::ecma::{
ast::{Expr, KeyValueProp, Prop, PropName, SimpleAssignTarget},
visit::fields::{CalleeField, PropField},
};
use turbo_rcstr::RcStr;
use turbo_tasks::{NonLocalValue, ResolvedVc, Vc, trace::TraceRawVcs};
use turbopack_core::chunk::ChunkingContext;
use super::EsmAssetReference;
use crate::{
ScopeHoistingContext,
code_gen::{CodeGen, CodeGeneration},
create_visitor,
references::{
AstPath,
esm::base::{ReferencedAsset, ReferencedAssetIdent},
},
};
#[derive(Hash, Clone, Debug, Serialize, Deserialize, PartialEq, Eq, TraceRawVcs, NonLocalValue)]
pub struct EsmBinding {
reference: ResolvedVc<EsmAssetReference>,
export: Option<RcStr>,
ast_path: AstPath,
keep_this: bool,
}
impl EsmBinding {
pub fn new(
reference: ResolvedVc<EsmAssetReference>,
export: Option<RcStr>,
ast_path: AstPath,
) -> Self {
EsmBinding {
reference,
export,
ast_path,
keep_this: false,
}
}
/// Where possible, bind the namespace to `this` when the named import is called.
pub fn new_keep_this(
reference: ResolvedVc<EsmAssetReference>,
export: Option<RcStr>,
ast_path: AstPath,
) -> Self {
EsmBinding {
reference,
export,
ast_path,
keep_this: true,
}
}
pub async fn code_generation(
&self,
chunking_context: Vc<Box<dyn ChunkingContext>>,
scope_hoisting_context: ScopeHoistingContext<'_>,
) -> Result<CodeGeneration> {
let mut visitors = vec![];
let export = self.export.clone();
let imported_module = self.reference.get_referenced_asset().await?;
enum ImportedIdent {
Module(ReferencedAssetIdent),
None,
Unresolvable,
}
let imported_ident = match &*imported_module {
ReferencedAsset::None => ImportedIdent::None,
imported_module => imported_module
.get_ident(chunking_context, export, scope_hoisting_context)
.await?
.map_or(ImportedIdent::Unresolvable, ImportedIdent::Module),
};
let mut ast_path = self.ast_path.0.clone();
loop {
match ast_path.last() {
// Shorthand properties get special treatment because we need to rewrite them to
// normal key-value pairs.
Some(swc_core::ecma::visit::AstParentKind::Prop(PropField::Shorthand)) => {
ast_path.pop();
visitors.push(create_visitor!(
exact,
ast_path,
visit_mut_prop,
|prop: &mut Prop| {
if let Prop::Shorthand(ident) = prop {
// TODO: Merge with the above condition when https://rust-lang.github.io/rfcs/2497-if-let-chains.html lands.
match &imported_ident {
ImportedIdent::Module(imported_ident) => {
*prop = Prop::KeyValue(KeyValueProp {
key: PropName::Ident(ident.clone().into()),
value: Box::new(
imported_ident.as_expr(ident.span, false),
),
});
}
ImportedIdent::None => {
*prop = Prop::KeyValue(KeyValueProp {
key: PropName::Ident(ident.clone().into()),
value: Expr::undefined(ident.span),
});
}
ImportedIdent::Unresolvable => {
// Do nothing, the reference will insert a throw
}
}
}
}
));
break;
}
// Any other expression can be replaced with the import accessor.
Some(swc_core::ecma::visit::AstParentKind::Expr(_)) => {
ast_path.pop();
let in_call = !self.keep_this
&& matches!(
ast_path.last(),
Some(swc_core::ecma::visit::AstParentKind::Callee(
CalleeField::Expr
))
);
visitors.push(create_visitor!(
exact,
ast_path,
visit_mut_expr,
|expr: &mut Expr| {
use swc_core::common::Spanned;
match &imported_ident {
ImportedIdent::Module(imported_ident) => {
*expr = imported_ident.as_expr(expr.span(), in_call);
}
ImportedIdent::None => {
*expr = *Expr::undefined(expr.span());
}
ImportedIdent::Unresolvable => {
// Do nothing, the reference will insert a throw
}
}
}
));
break;
}
// We need to handle LHS because of code like
// (function (RouteKind1){})(RouteKind || RouteKind = {})
Some(swc_core::ecma::visit::AstParentKind::SimpleAssignTarget(_)) => {
ast_path.pop();
visitors.push(create_visitor!(
exact,
ast_path,
visit_mut_simple_assign_target,
|l: &mut SimpleAssignTarget| {
use swc_core::common::Spanned;
match &imported_ident {
ImportedIdent::Module(imported_ident) => {
*l = imported_ident
.as_expr_individual(l.span())
.map_either(
|i| SimpleAssignTarget::Ident(i.into()),
SimpleAssignTarget::Member,
)
.into_inner();
}
ImportedIdent::None => {
// Do nothing, cannot assign to `undefined`
}
ImportedIdent::Unresolvable => {
// Do nothing, the reference will insert a throw
}
}
}
));
break;
}
Some(_) => {
ast_path.pop();
}
None => break,
}
}
Ok(CodeGeneration::visitors(visitors))
}
}
impl From<EsmBinding> for CodeGen {
fn from(val: EsmBinding) -> Self {
CodeGen::EsmBinding(val)
}
}
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