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use std::borrow::Cow;
use oxc_allocator::{Allocator, AllocatorAccessor, Box, FromIn, IntoIn, Vec};
use oxc_span::{SPAN, Span};
use oxc_str::{Ident, Str};
use oxc_syntax::{
comment_node::CommentNodeId, number::NumberBase, operator::UnaryOperator, scope::ScopeId,
};
use crate::ast::*;
/// Type that can be used in any AST builder method call which requires an `IntoIn<'a, Anything<'a>>`.
/// Pass `NONE` instead of `None::<Anything<'a>>`.
#[expect(clippy::upper_case_acronyms)]
pub struct NONE;
impl<'a, T> FromIn<'a, NONE> for Option<Box<'a, T>> {
fn from_in(_: NONE, _: &'a Allocator) -> Self {
None
}
}
impl<'a> AllocatorAccessor<'a> for AstBuilder<'a> {
#[inline]
fn allocator(self) -> &'a Allocator {
self.allocator
}
}
/// AST builder for creating AST nodes.
#[derive(Clone, Copy)]
pub struct AstBuilder<'a> {
/// The memory allocator used to allocate AST nodes in the arena.
pub allocator: &'a Allocator,
}
impl<'a> AstBuilder<'a> {
/// Create a new AST builder that will allocate nodes in the given allocator.
#[inline]
pub fn new(allocator: &'a Allocator) -> Self {
Self { allocator }
}
/// Create [`CommentNodeId`] for an AST node.
#[expect(dead_code, clippy::unused_self, clippy::trivially_copy_pass_by_ref)]
pub(crate) fn get_comment_node_id(&self) -> CommentNodeId {
// TODO: Generate a real ID
CommentNodeId::DUMMY
}
/// Move a value into the memory arena.
#[inline]
pub fn alloc<T>(self, value: T) -> Box<'a, T> {
Box::new_in(value, self.allocator)
}
/// Create a new empty [`Vec`] that stores its elements in the memory arena.
#[inline]
pub fn vec<T>(self) -> Vec<'a, T> {
Vec::new_in(self.allocator)
}
/// Create a new empty [`Vec`] that stores its elements in the memory arena.
/// Enough memory will be pre-allocated to store at least `capacity`
/// elements.
#[inline]
pub fn vec_with_capacity<T>(self, capacity: usize) -> Vec<'a, T> {
Vec::with_capacity_in(capacity, self.allocator)
}
/// Create a new arena-allocated [`Vec`] initialized with a single element.
#[inline]
pub fn vec1<T>(self, value: T) -> Vec<'a, T> {
self.vec_from_array([value])
}
/// Collect an iterator into a new arena-allocated [`Vec`].
#[inline]
pub fn vec_from_iter<T, I: IntoIterator<Item = T>>(self, iter: I) -> Vec<'a, T> {
Vec::from_iter_in(iter, self.allocator)
}
/// Create [`Vec`] from a fixed-size array.
///
/// This is preferable to `vec_from_iter` where source is an array, as size is statically known,
/// and compiler is more likely to construct the values directly in arena, rather than constructing
/// on stack and then copying to arena.
#[inline]
pub fn vec_from_array<T, const N: usize>(self, array: [T; N]) -> Vec<'a, T> {
Vec::from_array_in(array, self.allocator)
}
/// Allocate an [`Ident`] from a string slice.
#[inline]
pub fn ident(self, value: &str) -> Ident<'a> {
Ident::from_in(value, self.allocator)
}
/// Allocate an [`Ident`] from an array of string slices.
#[inline]
pub fn ident_from_strs_array<const N: usize>(self, strings: [&str; N]) -> Ident<'a> {
Ident::from_strs_array_in(strings, self.allocator)
}
/// Convert a [`Cow<'a, str>`] to an [`Ident<'a>`].
///
/// If the `Cow` borrows a string from arena, returns an `Ident` which references that same string,
/// without allocating a new one.
///
/// If the `Cow` is owned, allocates the string into arena to generate a new `Ident`.
#[inline]
pub fn ident_from_cow(self, value: &Cow<'a, str>) -> Ident<'a> {
Ident::from_cow_in(value, self.allocator)
}
/// Allocate a [`Str`] from a string slice.
#[inline]
pub fn str(self, value: &str) -> Str<'a> {
Str::from_in(value, self.allocator)
}
/// Allocate a [`Str`] from an array of string slices.
#[inline]
pub fn str_from_strs_array<const N: usize>(self, strings: [&str; N]) -> Str<'a> {
Str::from_strs_array_in(strings, self.allocator)
}
/// Convert a [`Cow<'a, str>`] to a [`Str<'a>`].
///
/// If the `Cow` borrows a string from arena, returns a `Str` which references that same string,
/// without allocating a new one.
///
/// If the `Cow` is owned, allocates the string into arena to generate a new `Str`.
#[inline]
pub fn str_from_cow(self, value: &Cow<'a, str>) -> Str<'a> {
Str::from_cow_in(value, self.allocator)
}
/// `0`
#[inline]
pub fn number_0(self) -> Expression<'a> {
self.expression_numeric_literal(SPAN, 0.0, None, NumberBase::Decimal)
}
/// `void 0`
#[inline]
pub fn void_0(self, span: Span) -> Expression<'a> {
let num = self.number_0();
Expression::UnaryExpression(self.alloc(self.unary_expression(
span,
UnaryOperator::Void,
num,
)))
}
/// `NaN`
#[inline]
pub fn nan(self, span: Span) -> Expression<'a> {
self.expression_numeric_literal(span, f64::NAN, None, NumberBase::Decimal)
}
/// `"use strict"` directive
#[inline]
pub fn use_strict_directive(self) -> Directive<'a> {
let use_strict = Str::from("use strict");
self.directive(SPAN, self.string_literal(SPAN, use_strict, None), use_strict)
}
/* ---------- Functions ---------- */
/// Create a [`FormalParameter`] with no type annotations, modifiers,
/// decorators, or initializer.
#[inline]
pub fn plain_formal_parameter(
self,
span: Span,
pattern: BindingPattern<'a>,
) -> FormalParameter<'a> {
self.formal_parameter(span, self.vec(), pattern, NONE, NONE, false, None, false, false)
}
/// Create a [`Function`] with no "extras".
/// i.e. no decorators, type annotations, accessibility modifiers, etc.
#[inline]
pub fn alloc_plain_function_with_scope_id(
self,
r#type: FunctionType,
span: Span,
id: Option<BindingIdentifier<'a>>,
params: FormalParameters<'a>,
body: FunctionBody<'a>,
scope_id: ScopeId,
) -> Box<'a, Function<'a>> {
self.alloc_function_with_scope_id_and_pure_and_pife(
span,
r#type,
id,
false,
false,
false,
NONE,
NONE,
params,
NONE,
Some(body),
scope_id,
false,
false,
)
}
/// Build a [`Function`] with `scope_id`.
#[inline]
pub fn alloc_function_with_scope_id<T1, T2, T3, T4, T5>(
self,
span: Span,
r#type: FunctionType,
id: Option<BindingIdentifier<'a>>,
generator: bool,
r#async: bool,
declare: bool,
type_parameters: T1,
this_param: T2,
params: T3,
return_type: T4,
body: T5,
scope_id: ScopeId,
) -> Box<'a, Function<'a>>
where
T1: IntoIn<'a, Option<Box<'a, TSTypeParameterDeclaration<'a>>>>,
T2: IntoIn<'a, Option<Box<'a, TSThisParameter<'a>>>>,
T3: IntoIn<'a, Box<'a, FormalParameters<'a>>>,
T4: IntoIn<'a, Option<Box<'a, TSTypeAnnotation<'a>>>>,
T5: IntoIn<'a, Option<Box<'a, FunctionBody<'a>>>>,
{
self.alloc_function_with_scope_id_and_pure_and_pife(
span,
r#type,
id,
generator,
r#async,
declare,
type_parameters,
this_param,
params,
return_type,
body,
scope_id,
false,
false,
)
}
/* ---------- Modules ---------- */
/// Create an empty [`ExportNamedDeclaration`] with no modifiers
#[inline]
pub fn plain_export_named_declaration_declaration(
self,
span: Span,
declaration: Declaration<'a>,
) -> Box<'a, ExportNamedDeclaration<'a>> {
self.alloc(self.export_named_declaration(
span,
Some(declaration),
self.vec(),
None,
ImportOrExportKind::Value,
NONE,
))
}
/// Create an [`ExportNamedDeclaration`] with no modifiers that contains a
/// set of [exported symbol names](ExportSpecifier).
#[inline]
pub fn plain_export_named_declaration(
self,
span: Span,
specifiers: Vec<'a, ExportSpecifier<'a>>,
source: Option<StringLiteral<'a>>,
) -> Box<'a, ExportNamedDeclaration<'a>> {
self.alloc(self.export_named_declaration(
span,
None,
specifiers,
source,
ImportOrExportKind::Value,
NONE,
))
}
}