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use crate::{
context::StrictType,
exec::{Executable, InterpreterState},
gc::{empty_trace, Finalize, Trace},
syntax::ast::node::{Declaration, Node},
BoaProfiler, Context, JsResult, JsValue,
};
use std::{collections::HashSet, fmt, ops::Deref, rc::Rc};
#[cfg(feature = "deser")]
use serde::{Deserialize, Serialize};
#[cfg(test)]
mod tests;
#[cfg_attr(feature = "deser", derive(Serialize, Deserialize))]
#[derive(Clone, Debug, Trace, Finalize, PartialEq)]
pub struct StatementList {
#[cfg_attr(feature = "deser", serde(flatten))]
items: Box<[Node]>,
strict: bool,
}
impl StatementList {
#[inline]
pub fn items(&self) -> &[Node] {
&self.items
}
#[inline]
pub fn strict(&self) -> bool {
self.strict
}
#[inline]
pub fn set_strict(&mut self, strict: bool) {
self.strict = strict;
}
pub(in crate::syntax::ast::node) fn display(
&self,
f: &mut fmt::Formatter<'_>,
indentation: usize,
) -> fmt::Result {
for node in self.items.iter() {
node.display(f, indentation)?;
match node {
Node::Block(_) | Node::If(_) | Node::Switch(_) | Node::WhileLoop(_) => {}
_ => write!(f, ";")?,
}
writeln!(f)?;
}
Ok(())
}
pub fn lexically_declared_names(&self) -> HashSet<&str> {
let mut set = HashSet::new();
for stmt in self.items() {
if let Node::LetDeclList(decl_list) | Node::ConstDeclList(decl_list) = stmt {
for decl in decl_list.as_ref() {
match decl {
Declaration::Identifier { ident, .. } => {
if !set.insert(ident.as_ref()) {
unreachable!("Redeclaration of {}", ident.as_ref());
}
}
Declaration::Pattern(p) => {
for ident in p.idents() {
if !set.insert(ident) {
unreachable!("Redeclaration of {}", ident);
}
}
}
}
}
}
}
set
}
pub fn function_declared_names(&self) -> HashSet<&str> {
let mut set = HashSet::new();
for stmt in self.items() {
if let Node::FunctionDecl(decl) = stmt {
set.insert(decl.name());
}
}
set
}
pub fn var_declared_names(&self) -> HashSet<&str> {
let mut set = HashSet::new();
for stmt in self.items() {
if let Node::VarDeclList(decl_list) = stmt {
for decl in decl_list.as_ref() {
match decl {
Declaration::Identifier { ident, .. } => {
set.insert(ident.as_ref());
}
Declaration::Pattern(p) => {
for ident in p.idents() {
set.insert(ident.as_ref());
}
}
}
}
}
}
set
}
}
impl Executable for StatementList {
fn run(&self, context: &mut Context) -> JsResult<JsValue> {
let _timer = BoaProfiler::global().start_event("StatementList", "exec");
let mut obj = JsValue::default();
context
.executor()
.set_current_state(InterpreterState::Executing);
let strict_before = context.strict_type();
match context.strict_type() {
StrictType::Off if self.strict => context.set_strict(StrictType::Function),
StrictType::Function if !self.strict => context.set_strict_mode_off(),
_ => {}
}
for (i, item) in self.items().iter().enumerate() {
let val = match item.run(context) {
Ok(val) => val,
Err(e) => {
context.set_strict(strict_before);
return Err(e);
}
};
match context.executor().get_current_state() {
InterpreterState::Return => {
obj = val;
break;
}
InterpreterState::Break(_label) => {
break;
}
InterpreterState::Continue(_label) => {
break;
}
InterpreterState::Executing => {
}
}
if i + 1 == self.items().len() {
obj = val;
}
}
context.set_strict(strict_before);
Ok(obj)
}
}
impl<T> From<T> for StatementList
where
T: Into<Box<[Node]>>,
{
fn from(stm: T) -> Self {
Self {
items: stm.into(),
strict: false,
}
}
}
impl fmt::Display for StatementList {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.display(f, 0)
}
}
#[derive(Clone, Debug, Finalize, PartialEq)]
pub struct RcStatementList(Rc<StatementList>);
impl Deref for RcStatementList {
type Target = StatementList;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl From<StatementList> for RcStatementList {
#[inline]
fn from(statementlist: StatementList) -> Self {
Self(Rc::from(statementlist))
}
}
unsafe impl Trace for RcStatementList {
empty_trace!();
}