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macro: use parse_hex_pattern for binnvec

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This commit is contained in:
Dmitry Belyaev 2022-08-28 00:58:01 +03:00
parent 1444dd6977
commit d5910d8350
Signed by: b4tman
GPG Key ID: 41A00BF15EA7E5F3
1 changed files with 2 additions and 70 deletions
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72
macro/src/lib.rs
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@ -7,68 +7,6 @@ macro_rules! forest {
($($x:expr),+) => {[$( TokenTree::from($x.clone()), )+]};
}
fn parse_hex_values(items: TokenStream) -> TokenStream {
let mut new_tokens: Vec<TokenTree> = vec![];
let comma: Punct = Punct::new(',', Spacing::Alone);
let zero = Literal::u8_suffixed(0);
let mut prev_separated: bool = true;
let mut prev_is_mask: bool = false;
for token in items {
match token {
TokenTree::Punct(ref x) if x.as_char() == ',' => {
new_tokens.push(token);
prev_separated = true;
continue;
}
TokenTree::Punct(ref x) if x.as_char() == '?' => {
if prev_is_mask {
if !prev_separated {
new_tokens.push(comma.clone().into());
}
let mut val = zero.clone();
val.set_span(x.span());
new_tokens.push(zero.clone().into());
prev_is_mask = false;
prev_separated = false;
} else if !prev_is_mask {
prev_is_mask = true;
}
continue;
}
TokenTree::Ident(ref x) if x.to_string().len() == 2 => {
if !prev_separated {
new_tokens.push(comma.clone().into());
}
let lit_str = format!("0x{}u8", x);
let mut val: Literal = lit_str.as_str().parse().expect("parse literal from ident");
val.set_span(x.span());
new_tokens.push(val.into());
}
TokenTree::Literal(ref x) => {
if !prev_separated {
new_tokens.push(comma.clone().into());
}
let in_str = x.to_string();
if in_str.starts_with("0x") {
new_tokens.push(token);
} else {
let lit_str = format!("0x{}u8", in_str);
let mut val: Literal = lit_str.as_str().parse().expect("parse literal");
val.set_span(x.span());
new_tokens.push(val.into());
}
}
_ => {}
}
prev_separated = false;
}
let mut new_stream = TokenStream::new();
new_stream.extend(new_tokens);
new_stream
}
fn parse_hex_pattern(items: TokenStream) -> (TokenStream, TokenStream) {
let mut vec_tokens: Vec<TokenTree> = vec![];
let mut mask_tokens: Vec<TokenTree> = vec![];
@ -157,7 +95,7 @@ fn parse_hex_pattern(items: TokenStream) -> (TokenStream, TokenStream) {
#[proc_macro]
pub fn binnvec(_item: TokenStream) -> TokenStream {
let group_elements = parse_hex_values(_item);
let (group_elements, ..) = parse_hex_pattern(_item);
let group = Group::new(Delimiter::Bracket, group_elements);
let mut result = TokenStream::new();
@ -194,13 +132,7 @@ pub fn binnpat(_item: TokenStream) -> TokenStream {
let i_from = Ident::new("from", Span::call_site());
let mut result = TokenStream::new();
result.extend(forest!(
i_struct,
sep_colon,
sep_colon,
i_from,
param_group
));
result.extend(forest!(i_struct, sep_colon, sep_colon, i_from, param_group));
result
}