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Copy pathlib.rs
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648 lines (576 loc) · 21.4 KB
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//! Passes for generating dts.
#![allow(incomplete_features)]
#![feature(box_syntax)]
#![feature(box_patterns)]
#![feature(specialization)]
use fxhash::FxHashSet;
use rnode::{NodeId, Visit, VisitMut, VisitMutWith, VisitWith};
use stc_ts_ast_rnode::{
RArrayPat, RAssignPat, RBlockStmt, RClass, RClassDecl, RClassMember, RClassProp, RDecl,
RExportDecl, RExportDefaultExpr, RExpr, RExprOrSuper, RFnDecl, RIdent, RImportDecl,
RImportSpecifier, RLit, RMemberExpr, RModuleDecl, RModuleItem, RNamedExport,
RParamOrTsParamProp, RPat, RPrivateName, RPrivateProp, RPropName, RStmt, RTsEntityName,
RTsEnumDecl, RTsIndexSignature, RTsInterfaceDecl, RTsKeywordType, RTsModuleDecl, RTsParamProp,
RTsParamPropParam, RTsPropertySignature, RTsType, RTsTypeAliasDecl, RTsTypeAnn, RVarDecl,
RVarDeclarator,
};
use stc_ts_types::{Id, ModuleTypeData};
use stc_ts_utils::{find_ids_in_pat, MapWithMut};
use swc_common::DUMMY_SP;
use swc_ecma_ast::*;
use self::{
ambient::RealImplRemover,
dce::{get_used, DceForDts},
};
pub use crate::mutations::apply_mutations;
mod ambient;
mod dce;
mod mutations;
/// Make `module` suitable for .d.ts file.
///
/// - Removes function body
pub fn cleanup_module_for_dts(module: &mut Vec<RModuleItem>, type_data: &ModuleTypeData) {
let is_module = module.iter().any(|item| match item {
RModuleItem::ModuleDecl(_) => true,
RModuleItem::Stmt(_) => false,
});
module.visit_mut_with(&mut RealImplRemover::default());
let (used_types, used_vars) = {
let mut v = TypeUsageCollector {
phase: CollectorPhase::SearchExports,
is_module,
in_module_item: false,
used_types: Default::default(),
used_vars: Default::default(),
};
module.visit_with(&mut v);
v.phase = CollectorPhase::AddTypes;
module.visit_with(&mut v);
(v.used_types, v.used_vars)
};
module.visit_mut_with(&mut Dts {
preserve_stmt: false,
used_types,
used_vars,
});
module.visit_mut_with(&mut DceForDts {
used: get_used(&type_data),
info: &type_data,
current_class: None,
in_declare: false,
top_level: true,
forced_module: false,
prevent_empty_export: false,
})
}
enum CollectorPhase {
SearchExports,
AddTypes,
}
struct TypeUsageCollector {
phase: CollectorPhase,
is_module: bool,
in_module_item: bool,
/// This includes types **only** used in public interface.
used_types: FxHashSet<Id>,
used_vars: FxHashSet<Id>,
}
impl Visit<RDecl> for TypeUsageCollector {
fn visit(&mut self, decl: &RDecl) {
match self.phase {
CollectorPhase::SearchExports => {
if self.is_module && !self.in_module_item {
return;
}
}
CollectorPhase::AddTypes => {
if self.is_module {
match decl {
RDecl::Class(RClassDecl { ident, .. })
| RDecl::Fn(RFnDecl { ident, .. })
| RDecl::TsInterface(RTsInterfaceDecl { id: ident, .. })
| RDecl::TsTypeAlias(RTsTypeAliasDecl { id: ident, .. })
| RDecl::TsEnum(RTsEnumDecl { id: ident, .. }) => {
if !self.used_types.contains(&ident.into()) {
return;
}
}
RDecl::Var(var) => {
let ids: Vec<Id> = find_ids_in_pat(&var.decls);
for id in ids {
if self.used_types.contains(&id) {
decl.visit_children_with(self);
return;
}
}
return;
}
RDecl::TsModule(_) => {}
}
}
}
}
decl.visit_children_with(self)
}
}
impl Visit<RExportDecl> for TypeUsageCollector {
fn visit(&mut self, export: &RExportDecl) {
let old = self.in_module_item;
self.in_module_item = true;
export.decl.visit_with(self);
self.in_module_item = old;
}
}
impl Visit<RExportDefaultExpr> for TypeUsageCollector {
fn visit(&mut self, export: &RExportDefaultExpr) {
match &*export.expr {
RExpr::Ident(i) => {
self.used_vars.insert(i.into());
}
_ => {}
}
}
}
impl Visit<RClass> for TypeUsageCollector {
fn visit(&mut self, class: &RClass) {
class.visit_children_with(self);
fn left_most(e: &RExpr) -> Option<Id> {
match e {
RExpr::Ident(i) => return Some(i.into()),
RExpr::Member(RMemberExpr {
obj: RExprOrSuper::Expr(e),
computed: false,
..
}) => return left_most(&e),
_ => None,
}
}
match &class.super_class {
Some(e) => {
if let Some(id) = left_most(&e) {
self.used_types.insert(id.clone());
self.used_vars.insert(id);
}
}
_ => {}
}
}
}
impl Visit<RTsEntityName> for TypeUsageCollector {
fn visit(&mut self, n: &RTsEntityName) {
match n {
RTsEntityName::TsQualifiedName(_) => {
n.visit_children_with(self);
}
RTsEntityName::Ident(i) => {
let id = Id::from(i);
// Exports may refer to module-private types.
self.used_types.insert(id);
}
}
}
}
impl Visit<Option<RBlockStmt>> for TypeUsageCollector {
fn visit(&mut self, _: &Option<RBlockStmt>) {}
}
struct Dts {
preserve_stmt: bool,
used_types: FxHashSet<Id>,
used_vars: FxHashSet<Id>,
}
impl VisitMut<RClassMember> for Dts {
fn visit_mut(&mut self, m: &mut RClassMember) {
match m {
RClassMember::Method(method) => {
if let Some(Accessibility::Private) = method.accessibility {
let computed = match method.key {
RPropName::Computed(..) => true,
_ => false,
};
// Converts a private method to a private property without type.
*m = RClassMember::ClassProp(RClassProp {
node_id: NodeId::invalid(),
span: method.span,
key: match &method.key {
RPropName::Ident(i) => box RExpr::Ident(i.clone()),
RPropName::Str(s) => {
box RExpr::Ident(RIdent::new(s.value.clone(), s.span))
}
RPropName::Num(n) => box RExpr::Lit(RLit::Num(n.clone())),
RPropName::Computed(e) => e.expr.clone(),
RPropName::BigInt(n) => box RExpr::Lit(RLit::BigInt(n.clone())),
},
value: None,
type_ann: None,
is_static: method.is_static,
decorators: Default::default(),
computed,
accessibility: Some(Accessibility::Private),
is_abstract: false,
is_optional: method.is_optional,
readonly: false,
declare: false,
definite: false,
is_override: false,
});
return;
}
}
_ => {}
}
m.visit_mut_children_with(self);
}
}
impl VisitMut<RTsPropertySignature> for Dts {
fn visit_mut(&mut self, ps: &mut RTsPropertySignature) {
if ps.type_ann.is_none() {
ps.type_ann = Some(RTsTypeAnn {
node_id: NodeId::invalid(),
span: DUMMY_SP,
type_ann: box RTsType::TsKeywordType(RTsKeywordType {
span: DUMMY_SP,
kind: TsKeywordTypeKind::TsAnyKeyword,
}),
});
}
}
}
impl VisitMut<Vec<RVarDeclarator>> for Dts {
fn visit_mut(&mut self, decls: &mut Vec<RVarDeclarator>) {
decls.visit_mut_children_with(self);
// Flatten var declarations
for decl in decls.take() {
match decl.name {
RPat::Array(RArrayPat {
span,
elems,
type_ann:
Some(RTsTypeAnn {
type_ann: box RTsType::TsTupleType(..),
..
}),
..
}) => {
//
for elem in elems.into_iter() {
match elem {
Some(name) => decls.push(RVarDeclarator {
node_id: NodeId::invalid(),
span,
name,
init: None,
definite: false,
}),
None => {}
}
}
}
// TODO
// RPat::Object(obj) => {}
_ => decls.push(decl),
}
}
}
}
impl VisitMut<RTsParamProp> for Dts {
fn visit_mut(&mut self, p: &mut RTsParamProp) {
p.visit_mut_children_with(self);
if p.accessibility == Some(Accessibility::Private) {
p.accessibility = None;
}
}
}
impl VisitMut<RClassProp> for Dts {
fn visit_mut(&mut self, prop: &mut RClassProp) {
prop.visit_mut_children_with(self);
if let Some(Accessibility::Private) = prop.accessibility {
prop.type_ann = None;
}
prop.value = None;
}
}
impl VisitMut<RPrivateProp> for Dts {
fn visit_mut(&mut self, prop: &mut RPrivateProp) {
prop.visit_mut_children_with(self);
prop.value = None;
}
}
impl VisitMut<Option<RBlockStmt>> for Dts {
fn visit_mut(&mut self, value: &mut Option<RBlockStmt>) {
*value = None;
}
}
impl VisitMut<RTsModuleDecl> for Dts {
fn visit_mut(&mut self, _: &mut RTsModuleDecl) {}
}
impl VisitMut<Vec<RModuleItem>> for Dts {
fn visit_mut(&mut self, items: &mut Vec<RModuleItem>) {
items.retain(|item| {
match item {
RModuleItem::ModuleDecl(decl) => match decl {
RModuleDecl::ExportNamed(export @ RNamedExport { src: None, .. })
if export.specifiers.is_empty() =>
{
return false
}
_ => {}
},
RModuleItem::Stmt(stmt) => match stmt {
RStmt::Decl(..) => {}
_ => return false,
},
}
// Let's be conservative
true
});
let is_module = items.iter().any(|item| match item {
RModuleItem::ModuleDecl(_) => true,
RModuleItem::Stmt(_) => false,
});
self.preserve_stmt |= !is_module;
items.visit_mut_children_with(self);
if is_module {
items.retain(|item| match item {
RModuleItem::ModuleDecl(_) => true,
RModuleItem::Stmt(RStmt::Decl(decl)) => match decl {
RDecl::Class(RClassDecl { ident, .. })
| RDecl::Fn(RFnDecl { ident, .. })
| RDecl::TsEnum(RTsEnumDecl { id: ident, .. })
| RDecl::TsTypeAlias(RTsTypeAliasDecl { id: ident, .. })
| RDecl::TsInterface(RTsInterfaceDecl { id: ident, .. }) => {
self.used_types.contains(&Id::from(ident))
}
// Handled by `visit_mut_var_decl`
RDecl::Var(decl) => !decl.decls.is_empty(),
RDecl::TsModule(_) => true,
},
_ => false,
});
}
items.retain(|item| match item {
RModuleItem::ModuleDecl(RModuleDecl::Import(RImportDecl { specifiers, .. })) => {
!specifiers.is_empty()
}
RModuleItem::Stmt(RStmt::Empty(..)) => false,
_ => true,
});
}
}
impl VisitMut<Vec<RImportSpecifier>> for Dts {
fn visit_mut(&mut self, specifiers: &mut Vec<RImportSpecifier>) {
specifiers.retain(|specifier| match specifier {
RImportSpecifier::Named(specifier) => {
self.used_types.contains(&Id::from(&specifier.local))
}
RImportSpecifier::Default(specifier) => {
self.used_types.contains(&Id::from(&specifier.local))
}
RImportSpecifier::Namespace(specifier) => {
self.used_types.contains(&Id::from(&specifier.local))
}
});
}
}
impl VisitMut<RExportDecl> for Dts {
fn visit_mut(&mut self, export: &mut RExportDecl) {
let old = self.preserve_stmt;
self.preserve_stmt = true;
export.decl.visit_mut_with(self);
self.preserve_stmt = old;
}
}
impl VisitMut<RVarDecl> for Dts {
fn visit_mut(&mut self, decl: &mut RVarDecl) {
decl.visit_mut_children_with(self);
decl.declare = true;
if self.preserve_stmt {
return;
}
decl.decls.retain(|decl| {
let ids: Vec<Id> = find_ids_in_pat(&decl.name);
for id in ids {
if self.used_vars.contains(&id) {
return true;
}
}
false
});
}
}
impl VisitMut<RFnDecl> for Dts {
fn visit_mut(&mut self, decl: &mut RFnDecl) {
decl.declare = true;
decl.visit_mut_children_with(self);
}
}
impl VisitMut<RClassDecl> for Dts {
fn visit_mut(&mut self, decl: &mut RClassDecl) {
decl.declare = true;
decl.visit_mut_children_with(self);
}
}
impl VisitMut<RTsTypeAliasDecl> for Dts {
fn visit_mut(&mut self, decl: &mut RTsTypeAliasDecl) {
decl.declare = true;
decl.visit_mut_children_with(self);
}
}
impl VisitMut<RTsEnumDecl> for Dts {
fn visit_mut(&mut self, decl: &mut RTsEnumDecl) {
decl.declare = true;
decl.visit_mut_children_with(self);
}
}
impl VisitMut<RPat> for Dts {
fn visit_mut(&mut self, pat: &mut RPat) {
pat.visit_mut_children_with(self);
match pat {
RPat::Assign(assign) => {
*pat = assign.left.take();
match pat {
RPat::Ident(pat) => pat.id.optional = true,
RPat::Array(pat) => pat.optional = true,
RPat::Object(pat) => pat.optional = true,
_ => {}
}
}
_ => {}
}
}
}
impl VisitMut<Vec<RClassMember>> for Dts {
fn visit_mut(&mut self, members: &mut Vec<RClassMember>) {
// Remove empty members.
members.retain(|member| match member {
RClassMember::Empty(..) => false,
_ => true,
});
members.visit_mut_children_with(self);
members.map_with_mut(|members| {
let mut props = Vec::with_capacity(members.len() + 6);
let mut buf = Vec::with_capacity(members.len());
//
let mut has_private = false;
for mut m in members {
match m {
RClassMember::Constructor(ref mut c) => {
for p in c.params.iter_mut() {
match p {
RParamOrTsParamProp::TsParamProp(ref mut p) => {
if p.accessibility.is_some() || p.readonly {
props.push(RClassMember::ClassProp(RClassProp {
node_id: NodeId::invalid(),
span: Default::default(),
declare: false,
key: box match &p.param {
RTsParamPropParam::Ident(p) => {
RExpr::Ident(p.id.clone())
}
RTsParamPropParam::Assign(p) => match &p.left {
//
box RPat::Ident(i) => {
RExpr::Ident(i.id.clone())
}
_ => unreachable!(
"binding pattern in property initializer"
8BD0
),
},
},
value: None,
type_ann: None,
is_static: false,
decorators: vec![],
computed: false,
accessibility: p.accessibility,
is_abstract: false,
is_optional: false,
readonly: p.readonly,
definite: false,
is_override: false,
}));
}
p.accessibility = None;
p.readonly = false;
match &mut p.param {
RTsParamPropParam::Ident(_) => {}
RTsParamPropParam::Assign(RAssignPat {
left: box RPat::Ident(i),
..
}) => {
// Original pattern has default value, so it should be
// option
i.id.optional = true;
p.param = RTsParamPropParam::Ident(i.clone());
}
_ => {}
}
}
_ => {}
}
}
}
RClassMember::Method(ref mut m) => {
if let Some(Accessibility::Public) = m.accessibility {
m.accessibility = None;
}
match &m.key {
RPropName::Computed(e) => match &*e.expr {
RExpr::Bin(..) => continue,
_ => {}
},
_ => {}
}
}
RClassMember::PrivateMethod(..) | RClassMember::PrivateProp(..) => {
has_private = true;
continue;
}
_ => {}
}
buf.push(m);
}
if has_private {
props.insert(
0,
RClassMember::PrivateProp(RPrivateProp {
node_id: NodeId::invalid(),
span: DUMMY_SP,
key: RPrivateName {
node_id: NodeId::invalid(),
span: DUMMY_SP,
id: RIdent::new("private".into(), DUMMY_SP),
},
value: None,
type_ann: None,
is_static: false,
decorators: Default::default(),
computed: false,
accessibility: None,
is_abstract: false,
is_optional: false,
readonly: false,
definite: false,
is_override: false,
}),
);
}
props.extend(buf);
props
})
}
}
impl VisitMut<RTsIndexSignature> for Dts {
fn visit_mut(&mut self, sig: &mut RTsIndexSignature) {
sig.visit_mut_children_with(self);
if sig.type_ann.is_none() {
sig.type_ann = Some(RTsTypeAnn {
node_id: NodeId::invalid(),
span: DUMMY_SP,
type_ann: box RTsType::TsKeywordType(RTsKeywordType {
span: DUMMY_SP,
kind: TsKeywordTypeKind::TsAnyKeyword,
}),
});
}
}
}