obeli-sk-boa-parser 1.0.0-obeli-sk.7

ECMAScript parser for the Boa JavaScript engine.
Documentation 
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//! Async Generator Declaration parsing
//!
//! Implements `TokenParser` for `AsyncGeneratorDeclaration`on and outputs an `AsyncGeneratorDecl`
//! ast node.

#[cfg(test)]
mod tests;

use crate::{
    parser::{
        AllowAwait, AllowDefault, AllowYield, Cursor, ParseResult, TokenParser,
        statement::declaration::hoistable::{CallableDeclaration, parse_callable_declaration},
    },
    source::ReadChar,
};
use boa_ast::{
    Keyword, Punctuator, function::AsyncGeneratorDeclaration as AsyncGeneratorDeclarationNode,
};
use boa_interner::Interner;

/// Async Generator Declaration Parser
///
/// More information:
/// - [ECMAScript specification][spec]
///
/// [spec]: https://tc39.es/ecma262/#prod-AsyncGeneratorDeclaration
#[derive(Debug, Clone, Copy)]
pub(in crate::parser) struct AsyncGeneratorDeclaration {
    allow_yield: AllowYield,
    allow_await: AllowAwait,
    is_default: AllowDefault,
}

impl AsyncGeneratorDeclaration {
    /// Creates a new `AsyncGeneratorDeclaration` parser.
    pub(in crate::parser) fn new<Y, A, D>(allow_yield: Y, allow_await: A, is_default: D) -> Self
    where
        Y: Into<AllowYield>,
        A: Into<AllowAwait>,
        D: Into<AllowDefault>,
    {
        Self {
            allow_yield: allow_yield.into(),
            allow_await: allow_await.into(),
            is_default: is_default.into(),
        }
    }
}

impl CallableDeclaration for AsyncGeneratorDeclaration {
    fn error_context(&self) -> &'static str {
        "async generator declaration"
    }

    fn is_default(&self) -> bool {
        self.is_default.0
    }

    fn name_allow_yield(&self) -> bool {
        self.allow_yield.0
    }

    fn name_allow_await(&self) -> bool {
        self.allow_await.0
    }

    fn parameters_allow_yield(&self) -> bool {
        true
    }

    fn parameters_allow_await(&self) -> bool {
        true
    }

    fn body_allow_yield(&self) -> bool {
        true
    }

    fn body_allow_await(&self) -> bool {
        true
    }
    fn parameters_await_is_early_error(&self) -> bool {
        true
    }
    fn parameters_yield_is_early_error(&self) -> bool {
        true
    }
}

impl<R> TokenParser<R> for AsyncGeneratorDeclaration
where
    R: ReadChar,
{
    type Output = AsyncGeneratorDeclarationNode;

    fn parse(self, cursor: &mut Cursor<R>, interner: &mut Interner) -> ParseResult<Self::Output> {
        let async_token = cursor.expect(
            (Keyword::Async, false),
            "async generator declaration",
            interner,
        )?;
        let start_linear_span = async_token.linear_span();

        cursor.peek_expect_no_lineterminator(0, "async generator declaration", interner)?;
        cursor.expect(
            (Keyword::Function, false),
            "async generator declaration",
            interner,
        )?;
        cursor.expect(Punctuator::Mul, "async generator declaration", interner)?;

        let result = parse_callable_declaration(&self, cursor, interner)?;
        let span = start_linear_span.union(result.2.linear_pos_end());

        Ok(AsyncGeneratorDeclarationNode::new(
            result.0, result.1, result.2, span,
        ))
    }
}