Carl Kadie CarlKCarlK
CarlKCarlK
/ fold-example-pt3.rs
Created
October 19, 2022 20:58
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| impl Fold for StmtCounter { | |
| fn fold_stmt(&mut self, stmt_old: Stmt) -> Stmt { | |
| let stmt_middle = syn::fold::fold_stmt(self, stmt_old); | |
| println!("stmt #{}: {}", self.count, quote!(#stmt_middle)); | |
| self.count += 1; | |
| if quote!(#stmt_middle).to_string().contains("galaxy") { | |
| parse_quote!(println!("hello universe");) | |
| } else { |
CarlKCarlK
/ fold-example-pt2.rs
Last active
October 19, 2022 20:57
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| impl Fold for StmtCounter { | |
| fn fold_stmt(&mut self, stmt_old: Stmt) -> Stmt { | |
| let stmt_middle = syn::fold::fold_stmt(self, stmt_old); | |
| // your code goes | |
| } | |
| } |
CarlKCarlK
/ fold-example-pt1.rs
Created
October 19, 2022 20:54
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| struct StmtCounter { | |
| count: usize, | |
| } |
CarlKCarlK
/ to_item_fn.rs
Last active
October 19, 2022 20:45
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| fn to_item_fn(&self) -> ItemFn { | |
| ItemFn { | |
| sig: Signature { | |
| generics: self.to_generics(), | |
| inputs: self.fn_args.clone(), | |
| ..self.old_fn.sig.clone() | |
| }, | |
| block: Box::new(Block { | |
| stmts: self.stmts.clone(), | |
| ..*self.old_fn.block.clone() |
CarlKCarlK
/ little-parse-quote.rs
Last active
October 19, 2022 20:43
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| use syn::{parse_quote, punctuated::Punctuated, token::Comma, token::Lt, WherePredicate}; | |
| fn main() { | |
| let _lt: Lt = parse_quote!(<); | |
| let _where_list: Punctuated<WherePredicate, Comma> = parse_quote!(); | |
| } |
CarlKCarlK
/ ident_to_stmt.rs
Last active
October 19, 2022 20:33
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| fn ident_to_stmt(&self, name: &Ident) -> Stmt { | |
| match &self { | |
| Special::AnyArray | Special::AnyString | Special::AnyPath => { | |
| parse_quote! { | |
| let #name = #name.as_ref(); | |
| } | |
| } | |
| Special::AnyIter => { | |
| parse_quote! { | |
| let #name = #name.into_iter(); |
CarlKCarlK
/ extract_where_predicates.rs
Created
October 19, 2022 20:30
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| // Even if the where clause is None, we still need to return an empty Punctuated | |
| fn extract_where_predicates(item_fn: &ItemFn) -> Punctuated<WherePredicate, Comma> { | |
| if let Some(WhereClause { predicates, .. }) = &item_fn.sig.generics.where_clause { | |
| predicates.clone() | |
| } else { | |
| parse_quote!() | |
| } | |
| } |
CarlKCarlK
/ assert_tokens_eq.rs
Created
October 19, 2022 15:11
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| fn assert_tokens_eq(expected: &TokenStream, actual: &TokenStream) { | |
| let expected = expected.to_string(); | |
| let actual = actual.to_string(); | |
| if expected != actual { | |
| println!( | |
| "{}", | |
| colored_diff::PrettyDifference { | |
| expected: &expected, | |
| actual: &actual, |
CarlKCarlK
/ one-input.rs
Last active
October 19, 2022 15:07
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| #[test] | |
| fn one_input() { | |
| let before = quote! { | |
| fn any_str_len(s: AnyString) -> usize | |
| { | |
| s.len() | |
| } | |
| }; | |
| let expected = quote! { |
CarlKCarlK
/ conversion-combinations.tsv
Created
October 19, 2022 15:01
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| To | From | Method | |
|---|---|---|---|
| string of code | literal code | std::stringify!{} | |
| string of code | syntax tree | !quote(#syntax_tree).to_string() | |
| string of code | TokenStream | .to_string() | |
| string of syntax | literal code | format!("{:?}",parse2::<SynType>(quote! {...}).expect(...) | |
| string of syntax | syntax tree | format!("{:?}"),…), format!("{:#?}"),…) | |
| string of tokens | literal code | format!("{:?}",quote! {...}) | |
| string of tokens | TokenStream | format!("{:?}"),…), format!("{:#?}"),…) | |
| syn::Error | TokenStream | .to_compile_error() [see Rule #7] | |
| syntax tree | literal code | parse_quote!(…) |