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resolve_fold.rs
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resolve_fold.rs
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use crate::resolver::Resolver;
use crate::swc_helpers::{is_call_expr_by_name, new_str};
use std::{cell::RefCell, rc::Rc};
use swc_common::{Span, DUMMY_SP};
use swc_ecmascript::ast::*;
use swc_ecmascript::visit::{noop_fold_type, Fold, FoldWith};
pub fn resolve_fold(
resolver: Rc<RefCell<Resolver>>,
strip_data_export: bool,
mark_import_src_location: bool,
) -> impl Fold {
ResolveFold {
resolver,
strip_data_export,
mark_import_src_location,
}
}
pub struct ResolveFold {
resolver: Rc<RefCell<Resolver>>,
strip_data_export: bool,
mark_import_src_location: bool,
}
impl Fold for ResolveFold {
noop_fold_type!();
// fold&resolve import/export url
fn fold_module_items(&mut self, module_items: Vec<ModuleItem>) -> Vec<ModuleItem> {
let mut items = Vec::<ModuleItem>::new();
for item in module_items {
match item {
ModuleItem::ModuleDecl(decl) => {
let item: ModuleItem = match decl {
// match: import React, { useState } from "https://esm.sh/react"
ModuleDecl::Import(import_decl) => {
if import_decl.type_only {
// ingore type import
ModuleItem::ModuleDecl(ModuleDecl::Import(import_decl))
} else {
let mut resolver = self.resolver.borrow_mut();
let resolved_url = resolver.resolve(
import_decl.src.value.as_ref(),
false,
mark_span(&import_decl.src.span, self.mark_import_src_location),
);
ModuleItem::ModuleDecl(ModuleDecl::Import(ImportDecl {
src: new_str(&resolved_url),
..import_decl
}))
}
}
// match: export { default as React, useState } from "https://esm.sh/react"
// match: export * as React from "https://esm.sh/react"
ModuleDecl::ExportNamed(NamedExport {
type_only,
specifiers,
src: Some(src),
span,
asserts,
}) => {
if type_only {
// ingore type export
ModuleItem::ModuleDecl(ModuleDecl::ExportNamed(NamedExport {
span,
specifiers,
src: Some(src),
type_only,
asserts,
}))
} else {
let mut resolver = self.resolver.borrow_mut();
let resolved_url = resolver.resolve(
src.value.as_ref(),
false,
mark_span(&src.span, self.mark_import_src_location),
);
ModuleItem::ModuleDecl(ModuleDecl::ExportNamed(NamedExport {
span,
specifiers,
src: Some(new_str(&resolved_url)),
type_only,
asserts,
}))
}
}
// match: export * from "https://esm.sh/react"
ModuleDecl::ExportAll(ExportAll { src, span, asserts }) => {
let mut resolver = self.resolver.borrow_mut();
let resolved_url = resolver.resolve(
src.value.as_ref(),
false,
mark_span(&src.span, self.mark_import_src_location),
);
ModuleItem::ModuleDecl(ModuleDecl::ExportAll(ExportAll {
span,
src: new_str(&resolved_url),
asserts,
}))
}
// match: export const data = { ... }
ModuleDecl::ExportDecl(ExportDecl {
decl: Decl::Var(var),
span,
}) => {
let mut data_export_idx = -1;
if self.strip_data_export && var.decls.len() > 0 {
let mut i = 0;
for decl in &var.decls {
if let Pat::Ident(bi) = &decl.name {
if decl.init.is_some() {
match bi.id.sym.as_ref() {
"data" | "GET" | "POST" | "PUT" | "PATCH" | "DELETE" => {
data_export_idx = i;
break;
}
_ => {}
}
}
}
i += 1;
}
}
if data_export_idx != -1 {
let mut i = -1;
ModuleItem::ModuleDecl(ModuleDecl::ExportDecl(ExportDecl {
span,
decl: Decl::Var(VarDecl {
decls: var
.decls
.into_iter()
.map(|decl| {
i += 1;
if data_export_idx == i {
VarDeclarator {
span: DUMMY_SP,
init: Some(Box::new(Expr::Lit(Lit::Bool(Bool {
span: DUMMY_SP,
value: true,
})))),
..decl
}
} else {
decl
}
})
.collect(),
..var
}),
}))
} else {
ModuleItem::ModuleDecl(ModuleDecl::ExportDecl(ExportDecl {
span,
decl: Decl::Var(var),
}))
}
}
// match: export function GET { ... }
ModuleDecl::ExportDecl(ExportDecl {
decl: Decl::Fn(decl),
span,
}) => {
let is_api_method = match decl.ident.sym.as_ref() {
"GET" | "POST" | "PUT" | "PATCH" | "DELETE" => true,
_ => false,
};
if self.strip_data_export && is_api_method {
ModuleItem::ModuleDecl(ModuleDecl::ExportDecl(ExportDecl {
span: DUMMY_SP,
decl: Decl::Fn(FnDecl {
ident: decl.ident.clone(),
declare: decl.declare,
function: Function {
span: DUMMY_SP,
params: vec![],
decorators: vec![],
body: Some(BlockStmt {
span: DUMMY_SP,
stmts: vec![],
}),
is_generator: false,
is_async: false,
type_params: None,
return_type: None,
},
}),
}))
} else {
ModuleItem::ModuleDecl(ModuleDecl::ExportDecl(ExportDecl {
span,
decl: Decl::Fn(decl),
}))
}
}
_ => ModuleItem::ModuleDecl(decl),
};
items.push(item.fold_children_with(self));
}
_ => {
items.push(item.fold_children_with(self));
}
};
}
items
}
// resolve worker import url
fn fold_new_expr(&mut self, mut new_expr: NewExpr) -> NewExpr {
let ok = match new_expr.callee.as_ref() {
Expr::Ident(id) => id.sym.as_ref().eq("Worker"),
_ => false,
};
if ok {
if let Some(args) = &mut new_expr.args {
let src = match args.first() {
Some(ExprOrSpread { expr, .. }) => match expr.as_ref() {
Expr::Lit(lit) => match lit {
Lit::Str(s) => Some(s),
_ => None,
},
_ => None,
},
_ => None,
};
if let Some(src) = src {
let mut resolver = self.resolver.borrow_mut();
let new_src = resolver.resolve(
src.value.as_ref(),
true,
mark_span(&src.span, self.mark_import_src_location),
);
args[0] = ExprOrSpread {
spread: None,
expr: Box::new(Expr::Lit(Lit::Str(new_str(&new_src)))),
}
}
}
};
new_expr.fold_children_with(self)
}
// resolve dynamic import url
fn fold_call_expr(&mut self, mut call: CallExpr) -> CallExpr {
if is_call_expr_by_name(&call, "import") {
let src = match call.args.first() {
Some(ExprOrSpread { expr, .. }) => match expr.as_ref() {
Expr::Lit(lit) => match lit {
Lit::Str(s) => Some(s),
_ => None,
},
_ => None,
},
_ => None,
};
if let Some(src) = src {
let mut resolver = self.resolver.borrow_mut();
let new_src = resolver.resolve(
src.value.as_ref(),
true,
mark_span(&src.span, self.mark_import_src_location),
);
call.args[0] = ExprOrSpread {
spread: None,
expr: Box::new(Expr::Lit(Lit::Str(new_str(&new_src)))),
}
}
}
call.fold_children_with(self)
}
}
fn mark_span(span: &Span, ok: bool) -> Option<Span> {
if ok {
Some(span.clone())
} else {
None
}
}