119 lines
3.5 KiB
Rust
119 lines
3.5 KiB
Rust
use crate::try_break;
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use crate::visitor::{VisitWith, Visitor, VisitorMut};
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use crate::{
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expression::{Expression, Identifier},
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join_nodes, StatementList,
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};
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use boa_interner::{Interner, ToIndentedString};
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use core::ops::ControlFlow;
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use super::FormalParameterList;
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/// An arrow function expression, as defined by the [spec].
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///
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/// An [arrow function][mdn] expression is a syntactically compact alternative to a regular function
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/// expression. Arrow function expressions are ill suited as methods, and they cannot be used as
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/// constructors. Arrow functions cannot be used as constructors and will throw an error when
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/// used with new.
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///
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/// [spec]: https://tc39.es/ecma262/#prod-ArrowFunction
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/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions
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#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
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#[cfg_attr(feature = "fuzz", derive(arbitrary::Arbitrary))]
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#[derive(Clone, Debug, PartialEq)]
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pub struct ArrowFunction {
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name: Option<Identifier>,
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parameters: FormalParameterList,
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body: StatementList,
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}
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impl ArrowFunction {
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/// Creates a new `ArrowFunctionDecl` AST Expression.
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#[inline]
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#[must_use]
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pub const fn new(
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name: Option<Identifier>,
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params: FormalParameterList,
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body: StatementList,
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) -> Self {
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Self {
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name,
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parameters: params,
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body,
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}
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}
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/// Gets the name of the function declaration.
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#[inline]
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#[must_use]
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pub const fn name(&self) -> Option<Identifier> {
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self.name
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}
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/// Sets the name of the function declaration.
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#[inline]
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pub fn set_name(&mut self, name: Option<Identifier>) {
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self.name = name;
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}
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/// Gets the list of parameters of the arrow function.
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#[inline]
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#[must_use]
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pub const fn parameters(&self) -> &FormalParameterList {
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&self.parameters
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}
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/// Gets the body of the arrow function.
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#[inline]
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#[must_use]
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pub const fn body(&self) -> &StatementList {
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&self.body
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}
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}
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impl ToIndentedString for ArrowFunction {
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fn to_indented_string(&self, interner: &Interner, indentation: usize) -> String {
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let mut buf = format!("({}", join_nodes(interner, self.parameters.as_ref()));
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if self.body().statements().is_empty() {
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buf.push_str(") => {}");
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} else {
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buf.push_str(&format!(
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") => {{\n{}{}}}",
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self.body.to_indented_string(interner, indentation + 1),
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" ".repeat(indentation)
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));
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}
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buf
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}
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}
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impl From<ArrowFunction> for Expression {
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fn from(decl: ArrowFunction) -> Self {
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Self::ArrowFunction(decl)
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}
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}
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impl VisitWith for ArrowFunction {
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fn visit_with<'a, V>(&'a self, visitor: &mut V) -> ControlFlow<V::BreakTy>
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where
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V: Visitor<'a>,
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{
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if let Some(ident) = &self.name {
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try_break!(visitor.visit_identifier(ident));
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}
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try_break!(visitor.visit_formal_parameter_list(&self.parameters));
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visitor.visit_statement_list(&self.body)
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}
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fn visit_with_mut<'a, V>(&'a mut self, visitor: &mut V) -> ControlFlow<V::BreakTy>
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where
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V: VisitorMut<'a>,
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{
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if let Some(ident) = &mut self.name {
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try_break!(visitor.visit_identifier_mut(ident));
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}
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try_break!(visitor.visit_formal_parameter_list_mut(&mut self.parameters));
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visitor.visit_statement_list_mut(&mut self.body)
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}
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}
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