/
symbol.rs
193 lines (163 loc) · 6.11 KB
/
symbol.rs
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use oxc_ast::ast::Expression;
use oxc_index::IndexVec;
use oxc_span::{Atom, CompactString, Span};
pub use oxc_syntax::{
scope::ScopeId,
symbol::{SymbolFlags, SymbolId},
};
use crate::{
node::AstNodeId,
reference::{Reference, ReferenceId},
};
#[cfg(feature = "serde")]
use serde::Serialize;
#[cfg_attr(
all(feature = "serde", feature = "wasm"),
wasm_bindgen::prelude::wasm_bindgen(typescript_custom_section)
)]
#[allow(dead_code)]
const TS_APPEND_CONTENT: &'static str = r#"
export type IndexVec<I, T> = Array<T>;
"#;
/// Symbol Table
///
/// `SoA` (Struct of Arrays) for memory efficiency.
#[derive(Debug, Default)]
#[cfg_attr(feature = "serde", derive(Serialize), serde(rename_all = "camelCase"))]
#[cfg_attr(all(feature = "serde", feature = "wasm"), derive(tsify::Tsify))]
pub struct SymbolTable {
pub spans: IndexVec<SymbolId, Span>,
pub names: IndexVec<SymbolId, CompactString>,
pub flags: IndexVec<SymbolId, SymbolFlags>,
pub scope_ids: IndexVec<SymbolId, ScopeId>,
/// Pointer to the AST Node where this symbol is declared
pub declarations: IndexVec<SymbolId, AstNodeId>,
pub resolved_references: IndexVec<SymbolId, Vec<ReferenceId>>,
pub references: IndexVec<ReferenceId, Reference>,
pub redeclare_variables: IndexVec<SymbolId, Vec<Span>>,
}
impl SymbolTable {
pub fn len(&self) -> usize {
self.spans.len()
}
pub fn is_empty(&self) -> bool {
self.len() == 0
}
pub fn iter(&self) -> impl Iterator<Item = SymbolId> + '_ {
self.spans.iter_enumerated().map(|(symbol_id, _)| symbol_id)
}
pub fn iter_rev(&self) -> impl Iterator<Item = SymbolId> + '_ {
self.spans.iter_enumerated().rev().map(|(symbol_id, _)| symbol_id)
}
pub fn get_symbol_id_from_span(&self, span: &Span) -> Option<SymbolId> {
self.spans
.iter_enumerated()
.find_map(|(symbol, inner_span)| if inner_span == span { Some(symbol) } else { None })
}
pub fn get_symbol_id_from_name(&self, name: &str) -> Option<SymbolId> {
self.names.iter_enumerated().find_map(|(symbol, inner_name)| {
if inner_name.as_str() == name {
Some(symbol)
} else {
None
}
})
}
pub fn get_span(&self, symbol_id: SymbolId) -> Span {
self.spans[symbol_id]
}
pub fn get_name(&self, symbol_id: SymbolId) -> &str {
&self.names[symbol_id]
}
pub fn set_name(&mut self, symbol_id: SymbolId, name: CompactString) {
self.names[symbol_id] = name;
}
pub fn get_flag(&self, symbol_id: SymbolId) -> SymbolFlags {
self.flags[symbol_id]
}
pub fn get_redeclare_variables(&self, symbol_id: SymbolId) -> &Vec<Span> {
&self.redeclare_variables[symbol_id]
}
pub fn union_flag(&mut self, symbol_id: SymbolId, includes: SymbolFlags) {
self.flags[symbol_id] |= includes;
}
pub fn get_scope_id(&self, symbol_id: SymbolId) -> ScopeId {
self.scope_ids[symbol_id]
}
pub fn get_scope_id_from_span(&self, span: &Span) -> Option<ScopeId> {
self.get_symbol_id_from_span(span).map(|symbol_id| self.get_scope_id(symbol_id))
}
pub fn get_scope_id_from_name(&self, name: &Atom) -> Option<ScopeId> {
self.get_symbol_id_from_name(name).map(|symbol_id| self.get_scope_id(symbol_id))
}
pub fn get_declaration(&self, symbol_id: SymbolId) -> AstNodeId {
self.declarations[symbol_id]
}
pub fn create_symbol(
&mut self,
span: Span,
name: Atom,
flag: SymbolFlags,
scope_id: ScopeId,
) -> SymbolId {
_ = self.spans.push(span);
_ = self.names.push(name.into_compact_string());
_ = self.flags.push(flag);
_ = self.scope_ids.push(scope_id);
_ = self.resolved_references.push(vec![]);
self.redeclare_variables.push(vec![])
}
pub fn add_declaration(&mut self, node_id: AstNodeId) {
self.declarations.push(node_id);
}
pub fn add_redeclare_variable(&mut self, symbol_id: SymbolId, span: Span) {
self.redeclare_variables[symbol_id].push(span);
}
pub fn create_reference(&mut self, reference: Reference) -> ReferenceId {
self.references.push(reference)
}
pub fn get_reference(&self, reference_id: ReferenceId) -> &Reference {
&self.references[reference_id]
}
pub fn has_binding(&self, reference_id: ReferenceId) -> bool {
self.references[reference_id].symbol_id().is_some()
}
pub fn is_global_reference(&self, reference_id: ReferenceId) -> bool {
self.references[reference_id].symbol_id().is_none()
}
pub fn get_resolved_reference_ids(&self, symbol_id: SymbolId) -> &Vec<ReferenceId> {
&self.resolved_references[symbol_id]
}
pub fn get_resolved_references(
&self,
symbol_id: SymbolId,
) -> impl Iterator<Item = &Reference> + '_ {
self.resolved_references[symbol_id]
.iter()
.map(|reference_id| &self.references[*reference_id])
}
/// Determine whether evaluating the specific input `node` is a consequenceless reference. ie.
/// evaluating it won't result in potentially arbitrary code from being ran. The following are
/// allowed and determined not to cause side effects:
///
/// - `this` expressions
/// - `super` expressions
/// - Bound identifiers
///
/// Reference:
/// <https://github.com/babel/babel/blob/419644f27c5c59deb19e71aaabd417a3bc5483ca/packages/babel-traverse/src/scope/index.ts#L557>
pub fn is_static(&self, expr: &Expression) -> bool {
match expr {
Expression::ThisExpression(_) | Expression::Super(_) => true,
Expression::Identifier(ident) => {
ident.reference_id.get().map_or(false, |reference_id| {
self.get_reference(reference_id).symbol_id().map_or_else(
|| self.has_binding(reference_id),
|symbol_id| self.get_resolved_references(symbol_id).all(|r| !r.is_write()),
)
})
}
_ => false,
}
}
}