66 lines
1.5 KiB
Rust
66 lines
1.5 KiB
Rust
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use nom::branch::alt;
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use nom::bytes::complete::tag;
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use nom::bytes::complete::take_until;
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use nom::character::complete::multispace0;
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use nom::character::complete::multispace1;
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use nom::character::complete::not_line_ending;
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use nom::multi::many1;
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use nom::IResult;
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pub fn mightbespace(i: &str) -> IResult<&str, ()> {
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let (i, _) = alt((comment, blank))(i)?;
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Ok((i, ()))
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}
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pub fn shouldbespace(i: &str) -> IResult<&str, ()> {
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let (i, _) = alt((comment, space))(i)?;
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Ok((i, ()))
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}
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pub fn comment(i: &str) -> IResult<&str, ()> {
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let (i, _) = multispace0(i)?;
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let (i, _) = many1(alt((block, slash, dash, hash)))(i)?;
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let (i, _) = multispace0(i)?;
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Ok((i, ()))
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}
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fn blank(i: &str) -> IResult<&str, ()> {
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let (i, _) = multispace0(i)?;
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Ok((i, ()))
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}
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fn space(i: &str) -> IResult<&str, ()> {
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let (i, _) = multispace1(i)?;
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Ok((i, ()))
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}
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fn block(i: &str) -> IResult<&str, ()> {
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let (i, _) = multispace0(i)?;
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let (i, _) = tag("/*")(i)?;
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let (i, _) = take_until("*/")(i)?;
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let (i, _) = tag("*/")(i)?;
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let (i, _) = multispace0(i)?;
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Ok((i, ()))
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}
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fn slash(i: &str) -> IResult<&str, ()> {
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let (i, _) = multispace0(i)?;
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let (i, _) = tag("//")(i)?;
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let (i, _) = not_line_ending(i)?;
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Ok((i, ()))
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}
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fn dash(i: &str) -> IResult<&str, ()> {
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let (i, _) = multispace0(i)?;
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let (i, _) = tag("--")(i)?;
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let (i, _) = not_line_ending(i)?;
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Ok((i, ()))
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}
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fn hash(i: &str) -> IResult<&str, ()> {
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let (i, _) = multispace0(i)?;
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let (i, _) = tag("#")(i)?;
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let (i, _) = not_line_ending(i)?;
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Ok((i, ()))
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}
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