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use super::{Context, Error, Parse, Parser};
use decoded_char::DecodedChar;
use locspan::{Meta, Span};

impl<M> Parse<M> for bool {
	fn parse_spanned<C, F, E>(
		parser: &mut Parser<C, F, E>,
		_context: Context,
	) -> Result<Meta<Self, Span>, Meta<Error<M, E>, M>>
	where
		C: Iterator<Item = Result<DecodedChar, E>>,
		F: FnMut(Span) -> M,
	{
		match parser.next_char()? {
			Some('t') => match parser.next_char()? {
				Some('r') => match parser.next_char()? {
					Some('u') => match parser.next_char()? {
						Some('e') => Ok(Meta(true, parser.position.current_span())),
						unexpected => {
							Err(Meta(Error::unexpected(unexpected), parser.position.last()))
						}
					},
					unexpected => Err(Meta(Error::unexpected(unexpected), parser.position.last())),
				},
				unexpected => Err(Meta(Error::unexpected(unexpected), parser.position.last())),
			},
			Some('f') => match parser.next_char()? {
				Some('a') => match parser.next_char()? {
					Some('l') => match parser.next_char()? {
						Some('s') => match parser.next_char()? {
							Some('e') => Ok(Meta(false, parser.position.current_span())),
							unexpected => {
								Err(Meta(Error::unexpected(unexpected), parser.position.last()))
							}
						},
						unexpected => {
							Err(Meta(Error::unexpected(unexpected), parser.position.last()))
						}
					},
					unexpected => Err(Meta(Error::unexpected(unexpected), parser.position.last())),
				},
				unexpected => Err(Meta(Error::unexpected(unexpected), parser.position.last())),
			},
			unexpected => Err(Meta(Error::unexpected(unexpected), parser.position.last())),
		}
	}
}