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Diffstat (limited to 'vendor/thiserror-impl/src/generics.rs')
-rw-r--r-- | vendor/thiserror-impl/src/generics.rs | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/vendor/thiserror-impl/src/generics.rs b/vendor/thiserror-impl/src/generics.rs deleted file mode 100644 index 95592a7..0000000 --- a/vendor/thiserror-impl/src/generics.rs +++ /dev/null @@ -1,83 +0,0 @@ -use proc_macro2::TokenStream; -use quote::ToTokens; -use std::collections::btree_map::Entry; -use std::collections::{BTreeMap as Map, BTreeSet as Set}; -use syn::punctuated::Punctuated; -use syn::{parse_quote, GenericArgument, Generics, Ident, PathArguments, Token, Type, WhereClause}; - -pub struct ParamsInScope<'a> { - names: Set<&'a Ident>, -} - -impl<'a> ParamsInScope<'a> { - pub fn new(generics: &'a Generics) -> Self { - ParamsInScope { - names: generics.type_params().map(|param| ¶m.ident).collect(), - } - } - - pub fn intersects(&self, ty: &Type) -> bool { - let mut found = false; - crawl(self, ty, &mut found); - found - } -} - -fn crawl(in_scope: &ParamsInScope, ty: &Type, found: &mut bool) { - if let Type::Path(ty) = ty { - if ty.qself.is_none() { - if let Some(ident) = ty.path.get_ident() { - if in_scope.names.contains(ident) { - *found = true; - } - } - } - for segment in &ty.path.segments { - if let PathArguments::AngleBracketed(arguments) = &segment.arguments { - for arg in &arguments.args { - if let GenericArgument::Type(ty) = arg { - crawl(in_scope, ty, found); - } - } - } - } - } -} - -pub struct InferredBounds { - bounds: Map<String, (Set<String>, Punctuated<TokenStream, Token![+]>)>, - order: Vec<TokenStream>, -} - -impl InferredBounds { - pub fn new() -> Self { - InferredBounds { - bounds: Map::new(), - order: Vec::new(), - } - } - - #[allow(clippy::type_repetition_in_bounds, clippy::trait_duplication_in_bounds)] // clippy bug: https://github.com/rust-lang/rust-clippy/issues/8771 - pub fn insert(&mut self, ty: impl ToTokens, bound: impl ToTokens) { - let ty = ty.to_token_stream(); - let bound = bound.to_token_stream(); - let entry = self.bounds.entry(ty.to_string()); - if let Entry::Vacant(_) = entry { - self.order.push(ty); - } - let (set, tokens) = entry.or_default(); - if set.insert(bound.to_string()) { - tokens.push(bound); - } - } - - pub fn augment_where_clause(&self, generics: &Generics) -> WhereClause { - let mut generics = generics.clone(); - let where_clause = generics.make_where_clause(); - for ty in &self.order { - let (_set, bounds) = &self.bounds[&ty.to_string()]; - where_clause.predicates.push(parse_quote!(#ty: #bounds)); - } - generics.where_clause.unwrap() - } -} |