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|
use proc_macro::{ TokenStream, TokenTree, Delimiter, Spacing, Group };
/// Input: "fn name(...) -> ... { ... }"
/// Output: "name", "(...)", "..."
pub fn split_fn(item: &TokenStream) -> (TokenStream, TokenStream, TokenStream) {
let item = item.clone().into_iter();
let mut name = TokenStream::new();
let mut args = TokenStream::new();
let mut ret = TokenStream::new();
let mut out: &mut TokenStream = &mut name;
for tt in item {
match tt {
// The conditions will later be used to return
// errors when incorrect function type is used
TokenTree::Ident(ref ident) => {
if ident.to_string() == "fn" || ident.to_string() == "pub" {
continue;
}
},
TokenTree::Punct(ref punct) => {
if punct.as_char() == '-' {
out = &mut ret;
continue;
}
if punct.as_char() == '>' && out.is_empty() {
continue;
}
},
TokenTree::Group(ref group) => {
if group.delimiter() == Delimiter::Brace {
break;
}
if ! out.is_empty() {
out = &mut args;
}
},
TokenTree::Literal(_) => unreachable!("Cannot have literal inside def!"),
}
out.extend([tt].into_iter());
}
(name, args, ret)
}
/// Input: "(p1 : t1, p2: t2, ...)"
/// Output: vec!["p1 : t1", "p2: t2", ...]
pub fn args_split(item: &TokenStream) -> Vec<TokenStream> {
let contents;
if let TokenTree::Group(group) = item.clone().into_iter().next().unwrap() {
contents = group.stream().into_iter();
}
else {
unreachable!();
}
let mut args = Vec::new();
let mut ts = TokenStream::new();
for tt in contents {
match tt {
TokenTree::Punct(ref punct) =>
if punct.as_char() == ',' {
args.push(ts);
ts = TokenStream::new();
continue;
},
_ => {},
}
ts.extend([tt].into_iter());
}
if ! ts.is_empty() {
args.push(ts);
}
args
}
/// Input: "(p1 : t1, p2: t2, ...)"
/// Output: vec!["p1 : t1", "p2: t2", ...]
pub fn args_split_public(item: &TokenStream, public: &Vec<&String>) -> Vec<TokenStream> {
args_split(item)
.into_iter()
.filter(|a| public.iter().any(|x| a.to_string().starts_with(*x)))
.collect()
}
/// Input: "(p1 : t1, p2: t2, ...)"
/// Output: vec![p1, p2, ...], vec![t1, t2, ...]
pub fn args_divide(item: &TokenStream) -> (Vec<TokenStream>, Vec<TokenStream>) {
let contents;
if let TokenTree::Group(group) = item.clone().into_iter().next().unwrap() {
contents = group.stream().into_iter();
}
else {
unreachable!();
}
let mut patterns = Vec::new();
let mut types = Vec::new();
let mut ts = TokenStream::new();
let mut ignore_next = false;
for tt in contents {
match tt {
TokenTree::Punct(ref punct) => {
if punct.spacing() == Spacing::Joint && punct.as_char() == ':' {
ignore_next = true;
}
else if !ignore_next {
match punct.as_char() {
':' => {
patterns.push(ts);
ts = TokenStream::new();
continue;
},
',' => {
types.push(ts);
ts = TokenStream::new();
continue;
},
_ => {},
}
}
else {
ignore_next = false;
}
},
_ => {},
}
ts.extend([tt].into_iter());
}
types.push(ts);
(patterns, types)
}
/// Input: "(p1 : t1, p2: t2, ...)"
/// Output: vec![p1, p2, ...], vec![t1, t2, ...]
pub fn args_divide_public(item: &TokenStream, public: &Vec<&String>) -> (Vec<TokenStream>, Vec<TokenStream>) {
let (patterns, types) = args_divide(item);
patterns
.into_iter()
.zip(types.into_iter())
.filter(|(p, _)| public.iter().any(|x| p.to_string() == **x))
.unzip()
}
/// Input: "(p1 : t1, p2: t2, ...)"
/// Output: "(p1, p2, ...)", "(t1, t2, ...)"
pub fn args_divide_grouped(item: &TokenStream) -> (TokenStream, TokenStream) {
let (patterns, types) = args_divide(&item);
(group_streams(&patterns), group_streams(&types))
}
/// Input: vec![p1, p2, ...]
/// Output: "(p1, p2, ...)"
pub fn group_streams(patterns: &Vec<TokenStream>) -> TokenStream {
let mut inner_ts = TokenStream::new();
inner_ts.extend(patterns.clone().into_iter().flat_map(|i| [",".parse().unwrap(), i]).skip(1));
let mut out = TokenStream::new();
out.extend([TokenTree::Group(Group::new(Delimiter::Parenthesis, inner_ts))].into_iter());
out
}
|
