File size: 2,577 Bytes
1e92f2d | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 | use anyhow::Error;
use rustc_hash::FxHashSet;
use swc_core::ecma::{
ast::{Module, ModuleDecl, ModuleItem},
atoms::Atom,
};
use super::{PartId, graph::find_turbopack_part_id_in_asserts};
/// A loader used to merge module items after splitting.
pub trait Load {
/// Loads a module while returning [None] if the module is already loaded.
fn load(&mut self, uri: &str, part_id: u32) -> Result<Option<Module>, Error>;
}
/// A module merger.
///
/// This ensures that a module is loaded only once.
pub struct Merger<L>
where
L: Load,
{
loader: L,
done: FxHashSet<(Atom, u32)>,
}
impl<L> Merger<L>
where
L: Load,
{
/// Creates a module merger.
pub fn new(loader: L) -> Self {
Merger {
loader,
done: Default::default(),
}
}
/// Merges module content by appending the content of imported modules. This
/// is recursive, so a single call is enough.
pub fn merge_recursively(&mut self, entry: Module) -> Result<Module, Error> {
let mut content = vec![];
let mut extra_body = vec![];
for stmt in entry.body {
match stmt {
ModuleItem::ModuleDecl(ModuleDecl::Import(import)) => {
// Try to prepend the content of module
let part_id = import
.with
.as_deref()
.and_then(find_turbopack_part_id_in_asserts);
if let Some(PartId::Internal(part_id, _)) = part_id {
if self.done.insert((import.src.value.clone(), part_id)) {
if let Some(dep) = self.loader.load(&import.src.value, part_id)? {
let mut dep = self.merge_recursively(dep)?;
extra_body.append(&mut dep.body);
} else {
content.push(ModuleItem::ModuleDecl(ModuleDecl::Import(import)));
}
} else {
// Remove import
}
} else {
// Preserve normal imports
content.push(ModuleItem::ModuleDecl(ModuleDecl::Import(import)));
}
}
_ => extra_body.push(stmt),
}
}
content.append(&mut extra_body);
Ok(Module {
span: entry.span,
body: content,
shebang: entry.shebang,
})
}
}
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