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use indexmap::set::IndexSet;
/// Index into SourceAtomSet.atoms.
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub struct SourceAtomSetIndex {
index: usize,
}
impl SourceAtomSetIndex {
fn new(index: usize) -> Self {
Self { index }
}
}
impl From<SourceAtomSetIndex> for usize {
fn from(index: SourceAtomSetIndex) -> usize {
index.index
}
}
// Call $handler macro with the list of common atoms.
//
// Basic Usage:
//
// ```
// for_all_common_atoms!(test);
// ```
//
// is expanded to
//
// ```
// test!(
// ("arguments", arguments, Arguments),
// ("async", async_, Async),
// ...
// );
// ```
//
// Extra Parameters:
//
// ```
// for_all_common_atoms!(test, foo, bar);
// ```
//
// is expanded to
//
// ```
// test!(
// foo, bar,
// ("arguments", arguments, Arguments),
// ("async", async_, Async),
// ...
// );
// ```
macro_rules! for_all_common_atoms {
($handler:ident $(, $($params:tt)*)?) => {
// string representation, method name, enum variant
$handler!(
$($($params)*,)?
("arguments", arguments, Arguments),
("as", as_, As),
("async", async_, Async),
("await", await_, Await),
("break", break_, Break),
("case", case, Case),
("catch", catch, Catch),
("class", class, Class),
("const", const_, Const),
("continue", continue_, Continue),
("debugger", debugger, Debugger),
("default", default, Default),
("delete", delete, Delete),
("do", do_, Do),
("else", else_, Else),
("enum", enum_, Enum),
("eval", eval, Eval),
("export", export, Export),
("extends", extends, Extends),
("false", false_, False),
("finally", finally, Finally),
("for", for_, For),
("from", from, From),
("function", function, Function),
("get", get, Get),
("if", if_, If),
("implements", implements, Implements),
("import", import, Import),
("in", in_, In),
("instanceof", instanceof, Instanceof),
("interface", interface, Interface),
("let", let_, Let),
("new", new_, New),
("null", null, Null),
("of", of, Of),
("package", package, Package),
("private", private, Private),
("protected", protected, Protected),
("public", public, Public),
("return", return_, Return),
("set", set, Set),
("static", static_, Static),
("super", super_, Super),
("switch", switch, Switch),
("target", target, Target),
("this", this, This),
("throw", throw, Throw),
("true", true_, True),
("try", try_, Try),
("typeof", typeof_, Typeof),
("var", var, Var),
("void", void, Void),
("while", while_, While),
("with", with, With),
("yield", yield_, Yield),
("use strict", use_strict, UseStrict),
("__proto__", __proto__, Proto),
);
}
}
// Define CommonAtoms enum, with
//
// enum CommonAtoms {
// Arguments = 0,
// Async,
// ...
// }
macro_rules! define_enum {
(($s0:tt, $method0:ident, $variant0:ident),
$(($s:tt, $method:ident, $variant:ident),)*) => {
enum CommonAtoms {
$variant0 = 0,
$($variant,)*
}
};
}
for_all_common_atoms!(define_enum);
// Define CommonSourceAtomSetIndices struct.
//
// impl CommonSourceAtomSetIndices {
// pub fn arguments() -> SourceAtomSetIndex { ... }
// pub fn async_() -> SourceAtomSetIndex { ... }
// ...
// }
macro_rules! define_struct {
($(($s:tt, $method:ident, $variant:ident),)*) => {
#[derive(Debug)]
pub struct CommonSourceAtomSetIndices {}
impl CommonSourceAtomSetIndices {
$(
pub fn $method() -> SourceAtomSetIndex {
SourceAtomSetIndex::new(CommonAtoms::$variant as usize)
}
)*
}
};
}
for_all_common_atoms!(define_struct);
/// Set of atoms, including the following:
///
/// * atoms referred from bytecode
/// * variable names referred from scope data
///
/// WARNING: This set itself does *NOT* map to JSScript::atoms().
#[derive(Debug)]
pub struct SourceAtomSet<'alloc> {
atoms: IndexSet<&'alloc str>,
}
impl<'alloc> SourceAtomSet<'alloc> {
// Create a set, with all common atoms inserted.
pub fn new() -> Self {
let mut result = Self {
atoms: IndexSet::new(),
};
result.insert_common_atoms();
result
}
// Insert all common atoms.
fn insert_common_atoms(&mut self) {
macro_rules! insert_atom {
($self: ident,
$(($s:tt, $method:ident, $variant:ident),)*) => {
$(
$self.atoms.insert($s);
)*
};
}
for_all_common_atoms!(insert_atom, self);
}
// Create a set, without any common atoms.
//
// This is for moving `SourceAtomSet` out of `Rc<RefCell>`, by replacing
// it with the result of this method.
pub fn new_uninitialized() -> Self {
Self {
// 256 is a number which should cover 75% of scripts without
// reallocation.
atoms: IndexSet::with_capacity(256),
}
}
pub fn insert(&mut self, s: &'alloc str) -> SourceAtomSetIndex {
let (index, _) = self.atoms.insert_full(s);
SourceAtomSetIndex::new(index)
}
pub fn get(&self, index: SourceAtomSetIndex) -> &'alloc str {
self.atoms.get_index(usize::from(index)).unwrap()
}
}
impl<'alloc> From<SourceAtomSet<'alloc>> for Vec<&'alloc str> {
fn from(set: SourceAtomSet<'alloc>) -> Vec<&'alloc str> {
set.atoms.into_iter().collect()
}
}