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use std::borrow::Cow;
use crate::{tsx_keywords::Is, TSXKeyword, TSXToken};
use iterator_endiate::EndiateIteratorExt;
use source_map::Span;
use tokenizer_lib::TokenReader;
use visitable_derive::Visitable;
use crate::{
errors::parse_lexing_error,
expressions::{ExpressionId, ExpressionOrBlock, MultipleExpression},
ASTNode, Keyword, TypeReference,
};
#[derive(Debug, PartialEq, Eq, Clone, Visitable)]
pub struct IsExpression {
pub is: Keyword<Is>,
pub matcher: Box<MultipleExpression>,
pub branches: Vec<(TypeReference, ExpressionOrBlock)>,
pub expression_id: ExpressionId,
pub position: Span,
}
#[cfg(feature = "self-rust-tokenize")]
impl self_rust_tokenize::SelfRustTokenize for IsExpression {
fn append_to_token_stream(
&self,
_token_stream: &mut self_rust_tokenize::proc_macro2::TokenStream,
) {
todo!()
}
}
impl ASTNode for IsExpression {
fn get_position(&self) -> Cow<source_map::Span> {
Cow::Borrowed(&self.position)
}
fn from_reader(
reader: &mut impl tokenizer_lib::TokenReader<crate::TSXToken, source_map::Span>,
state: &mut crate::ParsingState,
settings: &crate::ParseSettings,
) -> crate::ParseResult<Self> {
let span = reader.expect_next(TSXToken::Keyword(TSXKeyword::Is))?;
let is = Keyword::new(span);
is_expression_from_reader_sub_is_keyword(reader, state, settings, is)
}
fn to_string_from_buffer<T: source_map::ToString>(
&self,
buf: &mut T,
settings: &crate::ToStringSettingsAndData,
depth: u8,
) {
buf.push_str("is (");
self.matcher.to_string_from_buffer(buf, settings, depth);
buf.push_str(") {");
for (at_end, (l, r)) in self.branches.iter().endiate() {
l.to_string_from_buffer(buf, settings, depth);
buf.push_str(" => ");
r.to_string_from_buffer(buf, settings, depth);
if !at_end {
buf.push_str(", ");
}
}
buf.push('}');
}
}
pub(crate) fn is_expression_from_reader_sub_is_keyword(
reader: &mut impl TokenReader<TSXToken, source_map::Span>,
state: &mut crate::ParsingState,
settings: &crate::ParseSettings,
is: Keyword<Is>,
) -> Result<IsExpression, crate::ParseError> {
reader.expect_next(TSXToken::OpenParentheses)?;
let matcher = MultipleExpression::from_reader(reader, state, settings)?;
reader.expect_next(TSXToken::CloseParentheses)?;
reader.expect_next(TSXToken::OpenBrace)?;
let mut branches = Vec::new();
loop {
let type_reference = TypeReference::from_reader(reader, state, settings)?;
reader.expect_next(TSXToken::Arrow)?;
let body = ExpressionOrBlock::from_reader(reader, state, settings)?;
let tokenizer_lib::Token(next, pos) = reader.next().ok_or_else(parse_lexing_error)?;
branches.push((type_reference, body));
if next == TSXToken::CloseBrace {
return Ok(IsExpression {
position: is.1.union(&pos),
is,
matcher: Box::new(matcher),
branches,
expression_id: ExpressionId::new(),
});
} else if next != TSXToken::Comma {
todo!("Error")
}
}
}