|
|
|
//! Primary expression parsing.
|
|
|
|
//!
|
|
|
|
//! More information:
|
|
|
|
//! - [MDN documentation][mdn]
|
|
|
|
//! - [ECMAScript specification][spec]
|
|
|
|
//!
|
|
|
|
//! [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators#Primary_expressions
|
|
|
|
//! [spec]: https://tc39.es/ecma262/#prod-PrimaryExpression
|
|
|
|
|
|
|
|
mod array_initializer;
|
|
|
|
mod async_function_expression;
|
|
|
|
mod function_expression;
|
|
|
|
mod object_initializer;
|
|
|
|
mod template;
|
|
|
|
#[cfg(test)]
|
|
|
|
mod tests;
|
|
|
|
|
|
|
|
use self::{
|
|
|
|
array_initializer::ArrayLiteral, async_function_expression::AsyncFunctionExpression,
|
|
|
|
function_expression::FunctionExpression, object_initializer::ObjectLiteral,
|
|
|
|
};
|
|
|
|
use super::Expression;
|
|
|
|
use crate::{
|
|
|
|
profiler::BoaProfiler,
|
|
|
|
syntax::{
|
|
|
|
ast::{
|
|
|
|
node::{Call, Identifier, New, Node},
|
|
|
|
Const, Keyword, Punctuator,
|
|
|
|
},
|
|
|
|
lexer::{token::Numeric, InputElement, TokenKind},
|
|
|
|
parser::{
|
|
|
|
expression::primary::template::TemplateLiteral, AllowAwait, AllowYield, Cursor,
|
|
|
|
ParseError, ParseResult, TokenParser,
|
|
|
|
},
|
|
|
|
},
|
|
|
|
};
|
|
|
|
pub(in crate::syntax::parser) use object_initializer::Initializer;
|
|
|
|
|
|
|
|
use std::io::Read;
|
|
|
|
|
|
|
|
/// Parses a primary expression.
|
|
|
|
///
|
|
|
|
/// More information:
|
|
|
|
/// - [MDN documentation][mdn]
|
|
|
|
/// - [ECMAScript specification][spec]
|
|
|
|
///
|
|
|
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Primary_expressions
|
|
|
|
/// [spec]: https://tc39.es/ecma262/#prod-PrimaryExpression
|
|
|
|
#[derive(Debug, Clone, Copy)]
|
|
|
|
pub(super) struct PrimaryExpression {
|
|
|
|
allow_yield: AllowYield,
|
|
|
|
allow_await: AllowAwait,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl PrimaryExpression {
|
|
|
|
/// Creates a new `PrimaryExpression` parser.
|
|
|
|
pub(super) fn new<Y, A>(allow_yield: Y, allow_await: A) -> Self
|
|
|
|
where
|
|
|
|
Y: Into<AllowYield>,
|
|
|
|
A: Into<AllowAwait>,
|
|
|
|
{
|
|
|
|
Self {
|
|
|
|
allow_yield: allow_yield.into(),
|
|
|
|
allow_await: allow_await.into(),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl<R> TokenParser<R> for PrimaryExpression
|
|
|
|
where
|
|
|
|
R: Read,
|
|
|
|
{
|
|
|
|
type Output = Node;
|
|
|
|
|
|
|
|
fn parse(self, cursor: &mut Cursor<R>) -> ParseResult {
|
|
|
|
let _timer = BoaProfiler::global().start_event("PrimaryExpression", "Parsing");
|
|
|
|
|
|
|
|
let tok = cursor.next()?.ok_or(ParseError::AbruptEnd)?;
|
|
|
|
|
|
|
|
match tok.kind() {
|
|
|
|
TokenKind::Keyword(Keyword::This) => Ok(Node::This),
|
|
|
|
TokenKind::Keyword(Keyword::Function) => {
|
|
|
|
FunctionExpression.parse(cursor).map(Node::from)
|
|
|
|
}
|
|
|
|
TokenKind::Keyword(Keyword::Async) => AsyncFunctionExpression::new(self.allow_yield)
|
|
|
|
.parse(cursor)
|
|
|
|
.map(Node::from),
|
|
|
|
TokenKind::Punctuator(Punctuator::OpenParen) => {
|
|
|
|
cursor.set_goal(InputElement::RegExp);
|
|
|
|
let expr =
|
|
|
|
Expression::new(true, self.allow_yield, self.allow_await).parse(cursor)?;
|
|
|
|
cursor.expect(Punctuator::CloseParen, "primary expression")?;
|
|
|
|
Ok(expr)
|
|
|
|
}
|
|
|
|
TokenKind::Punctuator(Punctuator::OpenBracket) => {
|
|
|
|
cursor.set_goal(InputElement::RegExp);
|
|
|
|
ArrayLiteral::new(self.allow_yield, self.allow_await)
|
|
|
|
.parse(cursor)
|
|
|
|
.map(Node::ArrayDecl)
|
|
|
|
}
|
|
|
|
TokenKind::Punctuator(Punctuator::OpenBlock) => {
|
|
|
|
cursor.set_goal(InputElement::RegExp);
|
|
|
|
Ok(ObjectLiteral::new(self.allow_yield, self.allow_await)
|
|
|
|
.parse(cursor)?
|
|
|
|
.into())
|
|
|
|
}
|
|
|
|
TokenKind::BooleanLiteral(boolean) => Ok(Const::from(*boolean).into()),
|
|
|
|
TokenKind::NullLiteral => Ok(Const::Null.into()),
|
|
|
|
TokenKind::Identifier(ident) => Ok(Identifier::from(ident.as_ref()).into()), // TODO: IdentifierReference
|
|
|
|
TokenKind::StringLiteral(s) | TokenKind::TemplateNoSubstitution { cooked: s, .. } => {
|
|
|
|
Ok(Const::from(s.as_ref()).into())
|
|
|
|
}
|
|
|
|
TokenKind::NumericLiteral(Numeric::Integer(num)) => Ok(Const::from(*num).into()),
|
|
|
|
TokenKind::NumericLiteral(Numeric::Rational(num)) => Ok(Const::from(*num).into()),
|
|
|
|
TokenKind::NumericLiteral(Numeric::BigInt(num)) => Ok(Const::from(num.clone()).into()),
|
|
|
|
TokenKind::RegularExpressionLiteral(body, flags) => {
|
|
|
|
Ok(Node::from(New::from(Call::new(
|
|
|
|
Identifier::from("RegExp"),
|
|
|
|
vec![
|
|
|
|
Const::from(body.as_ref()).into(),
|
|
|
|
Const::from(flags.to_string()).into(),
|
|
|
|
],
|
|
|
|
))))
|
|
|
|
}
|
|
|
|
TokenKind::Punctuator(Punctuator::Div) => {
|
|
|
|
let tok = cursor.lex_regex(tok.span().start())?;
|
|
|
|
|
|
|
|
if let TokenKind::RegularExpressionLiteral(body, flags) = tok.kind() {
|
|
|
|
Ok(Node::from(New::from(Call::new(
|
|
|
|
Identifier::from("RegExp"),
|
|
|
|
vec![
|
|
|
|
Const::from(body.as_ref()).into(),
|
|
|
|
Const::from(flags.to_string()).into(),
|
|
|
|
],
|
|
|
|
))))
|
|
|
|
} else {
|
|
|
|
// A regex was expected and nothing else.
|
|
|
|
Err(ParseError::unexpected(tok, "regular expression literal"))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
TokenKind::TemplateMiddle { cooked, .. } => TemplateLiteral::new(
|
|
|
|
self.allow_yield,
|
|
|
|
self.allow_await,
|
|
|
|
tok.span().start(),
|
|
|
|
cooked.as_ref(),
|
|
|
|
)
|
|
|
|
.parse(cursor)
|
|
|
|
.map(Node::TemplateLit),
|
|
|
|
_ => Err(ParseError::unexpected(tok.clone(), "primary expression")),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|