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use std::cell::Cell;
use oxc::{
allocator::{CloneIn, Vec},
ast::ast::{
Argument, ArrowFunctionExpression, AssignmentExpression, AssignmentOperator,
AssignmentTarget, BinaryExpression, BinaryOperator, BindingIdentifier, BindingPattern,
BindingPatternKind, CallExpression, Expression, ExpressionStatement, FormalParameter,
FormalParameterKind, FormalParameters, FunctionBody, IdentifierName, IdentifierReference,
ObjectExpression, ObjectPropertyKind, Statement, StaticMemberExpression,
VariableDeclaration, VariableDeclarationKind, VariableDeclarator,
},
semantic::{NodeId, ReferenceFlags, ScopeFlags, SymbolFlags},
span::Atom,
syntax::number::NumberBase,
};
use oxc_traverse::TraverseCtx;
use crate::constants::{
K, NEW_PREV, PREV_ATTRS_IDENT, REMOVE_ATTRIBUTE, SET_ATTRIBUTE, UNDEFINED, V, VAL,
};
impl<'a> super::SurplusTraverser<'a> {
pub fn inner_exit_jsx_spread_attribute(
&mut self,
node: &mut oxc::ast::ast::JSXSpreadAttribute<'a>,
ctx: &mut TraverseCtx<'a>,
) {
if self
.element_stack
.last()
.unwrap()
.construction_obj
.is_some()
{
self.element_stack
.last_mut()
.unwrap()
.construction_obj
.as_mut()
.unwrap()
.properties
.push(ObjectPropertyKind::SpreadProperty(ctx.alloc(
oxc::ast::ast::SpreadElement {
span: node.span,
argument: node.argument.clone_in(self.allocator),
},
)));
} else {
// DOM element: Create unique symbol for prev_keys.
let prev_ident_str = PREV_ATTRS_IDENT;
let prev_span = node.span;
let prev_sym = ctx.scoping_mut().create_symbol(
prev_span,
prev_ident_str,
SymbolFlags::Variable,
self.element_stack.last().unwrap().scope,
NodeId::DUMMY,
);
let prev_ident_binding = BindingIdentifier {
span: prev_span,
name: Atom::new_const(prev_ident_str),
symbol_id: Cell::new(Some(prev_sym)),
};
let read_ref_id =
ctx.create_reference(prev_ident_str, Some(prev_sym), ReferenceFlags::Read);
let write_ref_id =
ctx.create_reference(prev_ident_str, Some(prev_sym), ReferenceFlags::Write);
let elem = self.element_stack.last().unwrap();
let mut new_statements = Vec::new_in(self.allocator);
// Add `let prev = {};` to statements.
new_statements.push(Statement::VariableDeclaration(ctx.alloc(
VariableDeclaration {
span: prev_span,
kind: VariableDeclarationKind::Let,
declare: false,
declarations: Vec::from_array_in(
[VariableDeclarator {
definite: false,
span: prev_span,
kind: VariableDeclarationKind::Let,
id: BindingPattern {
kind: BindingPatternKind::BindingIdentifier(
ctx.alloc(prev_ident_binding.clone()),
),
type_annotation: None,
optional: false,
},
init: Some(Expression::ObjectExpression(ctx.alloc(ObjectExpression {
span: prev_span,
properties: Vec::new_in(self.allocator),
trailing_comma: None,
}))),
}],
self.allocator,
),
},
)));
// Build the inner logic for the S computation.
let v_ident = Atom::new_const(V);
let val_ident = Atom::new_const(VAL);
let new_prev_ident = Atom::new_const(NEW_PREV);
let k_ident = Atom::new_const(K);
// Arrow function scope.
let arrow_scope = ctx.create_child_scope_of_current(ScopeFlags::Arrow);
// Create scope for blocks with declarations.
let block_scope = ctx.create_child_scope_of_current(ScopeFlags::empty());
// Statements inside the arrow function.
let arrow_statements = Vec::from_array_in(
[
// let new_prev = {};
Statement::VariableDeclaration(ctx.alloc(VariableDeclaration {
span: node.span,
kind: VariableDeclarationKind::Let,
declare: false,
declarations: Vec::from_array_in(
[VariableDeclarator {
definite: false,
span: node.span,
kind: VariableDeclarationKind::Let,
id: BindingPattern {
kind: BindingPatternKind::BindingIdentifier(ctx.alloc(
BindingIdentifier {
span: node.span,
name: new_prev_ident,
symbol_id: Cell::new(None),
},
)),
type_annotation: None,
optional: false,
},
init: Some(Expression::ObjectExpression(ctx.alloc(
ObjectExpression {
span: node.span,
properties: Vec::new_in(self.allocator),
trailing_comma: None,
},
))),
}],
self.allocator,
),
})),
// for (let k in v) { ... }
{
let for_in_scope = ctx.create_child_scope_of_current(ScopeFlags::empty());
Statement::ForInStatement(ctx.alloc(oxc::ast::ast::ForInStatement {
span: node.span,
left: oxc::ast::ast::ForStatementLeft::VariableDeclaration(ctx.alloc(VariableDeclaration {
span: node.span,
kind: VariableDeclarationKind::Let,
declare: false,
declarations: Vec::from_array_in(
[VariableDeclarator {
definite: false,
span: node.span,
kind: VariableDeclarationKind::Let,
id: BindingPattern {
kind: BindingPatternKind::BindingIdentifier(ctx.alloc(BindingIdentifier {
span: node.span,
name: k_ident,
symbol_id: Cell::new(None),
})),
type_annotation: None,
optional: false,
},
init: None,
}],
self.allocator,
),
})),
right: Expression::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: v_ident,
reference_id: Cell::new(None),
})),
body: Statement::BlockStatement(ctx.alloc(oxc::ast::ast::BlockStatement {
span: node.span,
body: Vec::from_array_in(
[
// let val = v[k];
Statement::VariableDeclaration(ctx.alloc(VariableDeclaration {
span: node.span,
kind: VariableDeclarationKind::Let,
declare: false,
declarations: Vec::from_array_in(
[VariableDeclarator {
definite: false,
span: node.span,
kind: VariableDeclarationKind::Let,
id: BindingPattern {
kind: BindingPatternKind::BindingIdentifier(ctx.alloc(BindingIdentifier {
span: node.span,
name: val_ident,
symbol_id: Cell::new(None),
})),
type_annotation: None,
optional: false,
},
init: Some(Expression::ComputedMemberExpression(ctx.alloc(oxc::ast::ast::ComputedMemberExpression {
span: node.span,
object: Expression::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: v_ident,
reference_id: Cell::new(None),
})),
expression: Expression::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: k_ident,
reference_id: Cell::new(None),
})),
optional: false,
}))),
}],
self.allocator,
),
})),
// if (val !== undefined) { elem.setAttribute(k, val); new_prev[k] = 1; } else { elem.removeAttribute(k); }
Statement::IfStatement(ctx.alloc(oxc::ast::ast::IfStatement {
span: node.span,
test: Expression::BinaryExpression(ctx.alloc(BinaryExpression {
span: node.span,
left: Expression::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: val_ident,
reference_id: Cell::new(None),
})),
operator: BinaryOperator::StrictInequality,
right: Expression::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: Atom::new_const(UNDEFINED),
reference_id: Cell::new(None),
})),
})),
consequent: Statement::BlockStatement(ctx.alloc(oxc::ast::ast::BlockStatement {
span: node.span,
body: Vec::from_array_in(
[
// elem.setAttribute(k, val);
Statement::ExpressionStatement(ctx.alloc(ExpressionStatement {
span: node.span,
expression: Expression::CallExpression(ctx.alloc(CallExpression {
span: node.span,
callee: Expression::StaticMemberExpression(ctx.alloc(StaticMemberExpression {
span: node.span,
object: elem.elem.as_ref().unwrap().ident.clone_in(self.allocator),
property: IdentifierName {
span: node.span,
name: Atom::new_const(SET_ATTRIBUTE),
},
optional: false,
})),
type_arguments: None,
arguments: Vec::from_array_in(
[
Argument::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: k_ident,
reference_id: Cell::new(None),
})),
Argument::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: val_ident,
reference_id: Cell::new(None),
})),
],
self.allocator,
),
optional: false,
pure: false,
})),
})),
// new_prev[k] = 1;
Statement::ExpressionStatement(ctx.alloc(ExpressionStatement {
span: node.span,
expression: Expression::AssignmentExpression(ctx.alloc(AssignmentExpression {
span: node.span,
operator: AssignmentOperator::Assign,
left: AssignmentTarget::ComputedMemberExpression(ctx.alloc(oxc::ast::ast::ComputedMemberExpression {
span: node.span,
object: Expression::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: new_prev_ident,
reference_id: Cell::new(None),
})),
expression: Expression::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: k_ident,
reference_id: Cell::new(None),
})),
optional: false,
})),
right: Expression::NumericLiteral(ctx.alloc(oxc::ast::ast::NumericLiteral {
span: node.span,
value: 1.0,
raw: None,
base: NumberBase::Decimal,
})),
})),
})),
],
self.allocator,
),
scope_id: Cell::new(None),
})),
alternate: Some(Statement::BlockStatement(ctx.alloc(oxc::ast::ast::BlockStatement {
span: node.span,
body: Vec::from_array_in(
[
// elem.removeAttribute(k);
Statement::ExpressionStatement(ctx.alloc(ExpressionStatement {
span: node.span,
expression: Expression::CallExpression(ctx.alloc(CallExpression {
span: node.span,
callee: Expression::StaticMemberExpression(ctx.alloc(StaticMemberExpression {
span: node.span,
object: elem.elem.as_ref().unwrap().ident.clone_in(self.allocator),
property: IdentifierName {
span: node.span,
name: Atom::new_const(REMOVE_ATTRIBUTE),
},
optional: false,
})),
type_arguments: None,
arguments: Vec::from_array_in(
[Argument::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: k_ident,
reference_id: Cell::new(None),
}))],
self.allocator,
),
optional: false,
pure: false,
})),
})),
],
self.allocator,
),
scope_id: Cell::new(None),
}))),
})),
],
self.allocator,
),
scope_id: Cell::new(Some(block_scope)),
})),
scope_id: Cell::new(Some(for_in_scope)),
}))
},
// for (let k in prev) { if (!(k in new_prev)) { elem.removeAttribute(k); } }
{
let for_in_scope = ctx.create_child_scope_of_current(ScopeFlags::empty());
Statement::ForInStatement(ctx.alloc(oxc::ast::ast::ForInStatement {
span: node.span,
left: oxc::ast::ast::ForStatementLeft::VariableDeclaration(ctx.alloc(VariableDeclaration {
span: node.span,
kind: VariableDeclarationKind::Let,
declare: false,
declarations: Vec::from_array_in(
[VariableDeclarator {
definite: false,
span: node.span,
kind: VariableDeclarationKind::Let,
id: BindingPattern {
kind: BindingPatternKind::BindingIdentifier(ctx.alloc(BindingIdentifier {
span: node.span,
name: k_ident,
symbol_id: Cell::new(None),
})),
type_annotation: None,
optional: false,
},
init: None,
}],
self.allocator,
),
})),
right: Expression::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: Atom::new_const(PREV_ATTRS_IDENT),
reference_id: Cell::new(Some(read_ref_id)),
})),
body: Statement::BlockStatement(ctx.alloc(oxc::ast::ast::BlockStatement {
span: node.span,
body: Vec::from_array_in(
[Statement::IfStatement(ctx.alloc(oxc::ast::ast::IfStatement {
span: node.span,
test: Expression::UnaryExpression(ctx.alloc(oxc::ast::ast::UnaryExpression {
span: node.span,
operator: oxc::ast::ast::UnaryOperator::LogicalNot,
argument: Expression::BinaryExpression(ctx.alloc(BinaryExpression {
span: node.span,
left: Expression::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: k_ident,
reference_id: Cell::new(None),
})),
operator: BinaryOperator::In,
right: Expression::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: new_prev_ident,
reference_id: Cell::new(None),
})),
})),
})),
consequent: Statement::BlockStatement(ctx.alloc(oxc::ast::ast::BlockStatement {
span: node.span,
body: Vec::from_array_in(
[Statement::ExpressionStatement(ctx.alloc(ExpressionStatement {
span: node.span,
expression: Expression::CallExpression(ctx.alloc(CallExpression {
span: node.span,
callee: Expression::StaticMemberExpression(ctx.alloc(StaticMemberExpression {
span: node.span,
object: elem.elem.as_ref().unwrap().ident.clone_in(self.allocator),
property: IdentifierName {
span: node.span,
name: Atom::new_const(REMOVE_ATTRIBUTE),
},
optional: false,
})),
type_arguments: None,
arguments: Vec::from_array_in(
[Argument::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: k_ident,
reference_id: Cell::new(None),
}))],
self.allocator,
),
optional: false,
pure: false,
})),
}))],
self.allocator,
),
scope_id: Cell::new(None),
})),
alternate: None,
}))],
self.allocator,
),
scope_id: Cell::new(None),
})),
scope_id: Cell::new(Some(for_in_scope)),
}))
},
// prev = new_prev;
Statement::ExpressionStatement(ctx.alloc(ExpressionStatement {
span: node.span,
expression: Expression::AssignmentExpression(ctx.alloc(
AssignmentExpression {
span: node.span,
operator: AssignmentOperator::Assign,
left: AssignmentTarget::AssignmentTargetIdentifier(ctx.alloc(
IdentifierReference {
span: node.span,
name: Atom::new_const(PREV_ATTRS_IDENT),
reference_id: Cell::new(Some(write_ref_id)),
},
)),
right: Expression::Identifier(ctx.alloc(IdentifierReference {
span: node.span,
name: new_prev_ident,
reference_id: Cell::new(None),
})),
},
)),
})),
],
self.allocator,
);
// Arrow function: (v) => { ... }
let arrow = ctx.alloc(ArrowFunctionExpression {
span: node.span,
expression: false,
r#async: false,
type_parameters: None,
params: ctx.alloc(FormalParameters {
span: node.span,
kind: FormalParameterKind::ArrowFormalParameters,
items: Vec::from_array_in(
[FormalParameter {
accessibility: None,
r#override: false,
decorators: Vec::new_in(self.allocator),
readonly: false,
span: node.span,
pattern: BindingPattern {
optional: false,
type_annotation: None,
kind: BindingPatternKind::BindingIdentifier(ctx.alloc(
BindingIdentifier {
span: node.span,
name: v_ident,
symbol_id: Cell::new(None),
},
)),
},
}],
self.allocator,
),
rest: None,
}),
return_type: None,
body: ctx.alloc(FunctionBody {
span: node.span,
directives: Vec::new_in(self.allocator),
statements: arrow_statements,
}),
scope_id: Cell::new(Some(arrow_scope)),
pure: false,
});
// S(arrow)
let s_call = self.s_expression(
ctx,
node.span,
Expression::CallExpression(ctx.alloc(CallExpression {
span: node.span,
callee: Expression::ArrowFunctionExpression(arrow),
type_arguments: None,
arguments: Vec::new_in(self.allocator),
optional: false,
pure: false,
})),
);
// Add S(...)(spread_expr) to statements.
new_statements.push(Statement::ExpressionStatement(ctx.alloc(
ExpressionStatement {
span: node.span,
expression: Expression::CallExpression(ctx.alloc(CallExpression {
span: node.span,
callee: s_call,
type_arguments: None,
arguments: Vec::from_array_in(
[node.argument.clone_in(self.allocator).into()],
self.allocator,
),
optional: false,
pure: false,
})),
},
)));
self.element_stack
.last_mut()
.unwrap()
.statements
.extend(new_statements);
}
}
}